阅读说明：本技术 一种发动机控制方法和装置 (Engine control method and device ) 是由 崔亚彬 宋东先 郑雨佳 王丹 张秀珍 王彦芳 于 2020-04-01 设计创作，主要内容包括：本发明实施例提供的发动机控制方法和装置,应用于车辆中的发动机控制单元,方法包括：在发动机中处于停缸状态的目标气缸需要切换到正常状态时,确定车辆的发动机的目标转速、目标扭矩以及目标气缸的当前进气歧管压力；根据目标转速和目标扭矩确定目标气缸的目标进气歧管压力；控制目标气缸的进气门及排气门从停止状态切换至运行状态；当目标气缸的当前进气歧管压力调整至目标进气歧管压力后,控制目标气缸的节气门、喷油器、火花塞切换至运行状态。通过控制目标气缸的进排气门进行运行,排出进气歧管中的多余气量,以使得目标气缸的当前进气歧管压力达到正常状态所需的目标进气歧管压力,避免了整车闯动的现象。(The embodiment of the invention provides an engine control method and device, which are applied to an engine control unit in a vehicle, and the method comprises the following steps: determining a target rotating speed and a target torque of an engine of a vehicle and a current intake manifold pressure of a target cylinder when the target cylinder in a cylinder deactivation state in the engine needs to be switched to a normal state; determining a target intake manifold pressure of the target cylinder according to the target rotating speed and the target torque; switching an intake valve and an exhaust valve of the control target cylinder from a stopped state to an operated state; and after the current pressure of the intake manifold of the target cylinder is adjusted to the target pressure of the intake manifold, controlling a throttle valve, an oil injector and a spark plug of the target cylinder to be switched to an operation state. The excess air quantity in the intake manifold is discharged by controlling the air inlet and exhaust valves of the target cylinder to operate, so that the current intake manifold pressure of the target cylinder reaches the target intake manifold pressure required by a normal state, and the phenomenon that the whole vehicle rushes is avoided.)

1. An engine control method, characterized by being applied to an engine control unit in a vehicle, the method comprising:

determining a target rotating speed, a target torque and a current intake manifold pressure of a target cylinder in a cylinder deactivation state when the target cylinder in the engine needs to be switched to a normal state;

determining a target intake manifold pressure for the target cylinder based on the target speed and the target torque;

controlling an intake valve and an exhaust valve of the target cylinder to switch from a stop state to an operating state to adjust a current intake manifold pressure of the target cylinder to the target intake manifold pressure;

and after the current pressure of the intake manifold of the target cylinder is adjusted to the target pressure of the intake manifold, controlling a throttle valve, an oil injector and a spark plug of the target cylinder to be switched to an operation state.

2. The method of claim 1, further comprising, prior to the step of determining a target speed, a target torque, and a current intake manifold pressure for the target cylinder of an engine of the vehicle:

determining a target torque of the engine and a target rotating speed of the engine according to the opening degree of an accelerator pedal of the vehicle;

the step of determining a target intake manifold pressure for the target cylinder based on the target rotational speed and the target torque includes:

and inquiring a preset first mapping relation according to the target torque of the engine and the target rotating speed of the engine to obtain corresponding target intake manifold pressure, wherein the preset first mapping relation is used for describing the mapping relation among the target torque of the engine, the target rotating speed of the engine and the target intake manifold pressure.

3. The method of claim 1, wherein the step of controlling the intake and exhaust valves of the target cylinder to switch from a stopped state to an operated state to adjust the current intake manifold pressure of the target cylinder to the target intake manifold pressure comprises:

determining a pressure difference between a current intake manifold pressure and a target intake manifold pressure of a target cylinder;

inquiring a preset second mapping relation according to the pressure difference and the valve timing position of the intake valve to obtain a corresponding target operation frequency, wherein the target operation frequency refers to the frequency of the operation ventilation process of the target cylinder, and the preset second mapping relation is used for describing the correlation relation between the pressure difference and the valve timing position of the intake valve and the target operation frequency;

and controlling an intake valve and an exhaust valve of the target cylinder to be switched from a stop state to an operation state according to the target operation times.

4. The method of claim 3, wherein said step of querying a preset second mapping relationship based on said pressure difference, valve timing position of said intake valve, to obtain a corresponding target number of operations is followed by the step of:

and rounding the target running times according to a preset carry system.

5. The method of claim 3, wherein the preset second mapping relationship is obtained by:

determining the total air quantity of the intake manifold according to the current pressure of the intake manifold and the volume of the intake manifold;

determining the single exhaust volume of the target cylinder in a single execution ventilation process according to the standard displacement of the target cylinder, the current pressure of an intake manifold and the valve timing position of an intake valve;

updating the current pressure of the intake manifold according to the single displacement, the total gas quantity and the volume of the intake manifold, and accumulating the circulation times;

when the updated current intake manifold pressure does not reach the target intake manifold pressure, determining the total air quantity of the intake manifold according to the current intake manifold pressure and the volume of the intake manifold;

and when the updated current intake manifold pressure reaches the target intake manifold pressure, taking the cycle number as a target operation number, thereby establishing a second mapping relation among the pressure difference, the valve timing position of the intake valve and the target operation number.

6. The method of claim 5, wherein the step of determining a single volume of exhaust for a single execution of a ventilation cycle for the target cylinder based on the standard displacement and current intake manifold pressure for the target cylinder, and valve timing position of an intake valve, comprises:

inquiring a preset third mapping relation according to the valve timing position of the intake valve to obtain a corresponding displacement correction coefficient, and obtaining the effective displacement of the engine according to the displacement correction coefficient and the standard displacement of the engine, wherein the preset third mapping relation is used for describing the mapping relation between the valve timing position of the intake valve and the displacement correction coefficient;

and determining the single exhaust volume of the target cylinder in a single execution process according to the effective displacement and the current intake manifold pressure.

7. The method of claim 1, wherein the step of controlling the intake and exhaust valves of the target cylinder to switch from a stopped state to an operated state to adjust the current intake manifold pressure of the target cylinder to the target intake manifold pressure comprises:

and controlling an intake valve and an exhaust valve of the target cylinder to be switched to an operation state, and updating the current pressure of the intake manifold through a pressure sensor of the target cylinder until the updated current pressure of the intake manifold reaches the target pressure of the intake manifold.

8. The method of claim 1, wherein determining the target speed of the engine of the vehicle, the target torque, and the current intake manifold pressure of the target cylinder when the target cylinder in a deactivated state in the engine needs to be switched to a normal state further comprises;

acquiring a running state of a vehicle;

when the vehicle needs to be switched from a coasting state to an acceleration state, acquiring a target cylinder deactivation rate of the vehicle according to a target torque of the vehicle;

and determining whether a target cylinder in a cylinder deactivation state in the engine needs to be switched to a normal state or not according to the target cylinder deactivation rate.

9. An engine control apparatus, characterized by being applied to an engine control unit in a vehicle, the apparatus comprising:

the engine control device comprises a first determination module, a second determination module and a control module, wherein the first determination module is used for determining a target rotating speed, a target torque and a current intake manifold pressure of a target cylinder in a cylinder deactivation state when the target cylinder in an engine needs to be switched to a normal state;

a second determination module to determine a target intake manifold pressure for the target cylinder based on the target speed and the target torque;

the first control module is used for controlling an intake valve and an exhaust valve of the target cylinder to be switched from a stop state to an operation state so as to adjust the current intake manifold pressure of the target cylinder to the target intake manifold pressure;

and the second control module is used for controlling a throttle valve, an oil injector and a spark plug of the target cylinder to be switched to an operation state after the current intake manifold pressure of the target cylinder is adjusted to the target intake manifold pressure.

10. The apparatus of claim 9, wherein the first control module is further configured to:

determining a pressure difference between a current intake manifold pressure and a target intake manifold pressure of a target cylinder;

inquiring a preset second mapping relation according to the pressure difference and the valve timing position of the intake valve to obtain a corresponding target operation frequency, wherein the target operation frequency refers to the frequency of the operation ventilation process of the target cylinder, and the preset second mapping relation is used for describing the correlation relation between the pressure difference and the valve timing position of the intake valve and the target operation frequency;

and controlling an intake valve and an exhaust valve of the target cylinder to be switched from a stop state to an operation state according to the target operation times.

Technical Field

The invention relates to the technical field of vehicles, in particular to an engine control method and device.

Background

As an important vehicle, the automobile is widely applied to the aspects of daily life of people. However, with the increasingly severe global environmental problems and the lack of energy, the more stringent emission standards and lower fuel consumption of automobiles become the mainstream trend of the social demands for automobile engines.

The cylinder deactivation technology is a widely used engine technology, and when the engine runs at a low load, fuel supply, ignition and air intake and exhaust of a part of cylinders are closed, so that the part of cylinders stop working, the load of the rest working cylinders is increased, the working efficiency of the engine is improved, and the fuel consumption is reduced.

When the engine using the cylinder deactivation technology is switched from a normal operation state to a sliding state, the throttle valve, the intake valve and the exhaust valve are closed, and oil injection ignition is stopped, so that the engine does not consume air any more, but the throttle valve has certain air leakage performance, so that the air can leak from the throttle valve to the intake manifold, the pressure in the intake manifold can gradually approach the atmospheric pressure, and the pressure in the intake manifold is higher than the required pressure when the cylinder in the cylinder deactivation state works again, so that the whole vehicle rushes.

Disclosure of Invention

In view of the above, the present invention is directed to an engine control method and apparatus to solve the problem of vehicle crash caused by the current intake manifold pressure being higher than the target intake manifold pressure when the vehicle is re-accelerated from a coasting state.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

an engine control method applied to an engine control unit in a vehicle, the method comprising:

determining a target rotating speed, a target torque and a current intake manifold pressure of a target cylinder in a cylinder deactivation state when the target cylinder in the engine needs to be switched to a normal state;

determining a target intake manifold pressure for the target cylinder based on the target speed and the target torque;

controlling an intake valve and an exhaust valve of the target cylinder to switch from a stop state to an operating state to adjust a current intake manifold pressure of the target cylinder to the target intake manifold pressure;

and after the current pressure of the intake manifold of the target cylinder is adjusted to the target pressure of the intake manifold, controlling a throttle valve, an oil injector and a spark plug of the target cylinder to be switched to an operation state.

Optionally, before the step of determining the target speed, the target torque and the current intake manifold pressure of the target cylinder of the engine of the vehicle, the method further comprises:

determining a target torque of the engine and a target rotating speed of the engine according to the opening degree of an accelerator pedal of the vehicle;

the step of determining a target intake manifold pressure for the target cylinder based on the target rotational speed and the target torque includes:

and inquiring a preset first mapping relation according to the target torque of the engine and the target rotating speed of the engine to obtain corresponding target intake manifold pressure, wherein the preset first mapping relation is used for describing the mapping relation among the target torque of the engine, the target rotating speed of the engine and the target intake manifold pressure.

Optionally, the step of controlling the intake valve and the exhaust valve of the target cylinder to switch from a stop state to an operating state to adjust the current intake manifold pressure of the target cylinder to the target intake manifold pressure includes:

determining a pressure difference between a current intake manifold pressure and a target intake manifold pressure of a target cylinder;

inquiring a preset second mapping relation according to the pressure difference and the valve timing position of the intake valve to obtain a corresponding target operation frequency, wherein the target operation frequency refers to the frequency of the operation ventilation process of the target cylinder, and the preset second mapping relation is used for describing the correlation relation between the pressure difference and the valve timing position of the intake valve and the target operation frequency;

and controlling an intake valve and an exhaust valve of the target cylinder to be switched from a stop state to an operation state according to the target operation times.

Optionally, after the step of querying a preset second mapping relation according to the pressure difference and the valve timing position of the intake valve to obtain the corresponding target operation times, the method further includes:

and rounding the target running times according to a preset carry system.

Optionally, the preset second mapping relationship is obtained through the following steps:

determining the total air quantity of the intake manifold according to the current pressure of the intake manifold and the volume of the intake manifold;

determining the single exhaust volume of the target cylinder in a single execution ventilation process according to the standard displacement of the target cylinder, the current pressure of an intake manifold and the valve timing position of an intake valve;

updating the current pressure of the intake manifold according to the single displacement, the total gas quantity and the volume of the intake manifold, and accumulating the circulation times;

when the updated current intake manifold pressure does not reach the target intake manifold pressure, determining the total air quantity of the intake manifold according to the current intake manifold pressure and the volume of the intake manifold;

and when the updated current intake manifold pressure reaches the target intake manifold pressure, taking the cycle number as a target operation number, thereby establishing a second mapping relation among the pressure difference, the valve timing position of the intake valve and the target operation number.

Optionally, the step of determining a single exhaust volume of a single executed ventilation process of the target cylinder according to the standard displacement of the target cylinder, the current intake manifold pressure and the valve timing position of the intake valve comprises:

inquiring a preset third mapping relation according to the valve timing position of the intake valve to obtain a corresponding displacement correction coefficient, and obtaining the effective displacement of the engine according to the displacement correction coefficient and the standard displacement of the engine, wherein the preset third mapping relation is used for describing the mapping relation between the valve timing position of the intake valve and the displacement correction coefficient;

and determining the single exhaust volume of the target cylinder in a single execution process according to the effective displacement and the current intake manifold pressure.

Optionally, the step of controlling the intake valve and the exhaust valve of the target cylinder to switch from a stop state to an operating state to adjust the current intake manifold pressure of the target cylinder to the target intake manifold pressure includes:

and controlling an intake valve and an exhaust valve of the target cylinder to be switched to an operation state, and updating the current pressure of the intake manifold through a pressure sensor of the target cylinder until the updated current pressure of the intake manifold reaches the target pressure of the intake manifold.

Optionally, when the target cylinder in the cylinder deactivation state in the engine needs to be switched to the normal state, determining a target rotation speed, a target torque and a current intake manifold pressure of the target cylinder of the vehicle;

acquiring a running state of a vehicle;

when the vehicle needs to be switched from a coasting state to an acceleration state, acquiring a target cylinder deactivation rate of the vehicle according to a target torque of the vehicle;

and determining whether a target cylinder in a cylinder deactivation state in the engine needs to be switched to a normal state or not according to the target cylinder deactivation rate.

An engine control apparatus applied to an engine control unit in a vehicle, the apparatus comprising:

the engine control device comprises a first determination module, a second determination module and a control module, wherein the first determination module is used for determining a target rotating speed, a target torque and a current intake manifold pressure of a target cylinder in a cylinder deactivation state when the target cylinder in an engine needs to be switched to a normal state;

a second determination module to determine a target intake manifold pressure for the target cylinder based on the target speed and the target torque;

the first control module is used for controlling an intake valve and an exhaust valve of the target cylinder to be switched from a stop state to an operation state so as to adjust the current intake manifold pressure of the target cylinder to the target intake manifold pressure;

and the second control module is used for controlling a throttle valve, an oil injector and a spark plug of the target cylinder to be switched to an operation state after the current intake manifold pressure of the target cylinder is adjusted to the target intake manifold pressure.

Optionally, the apparatus further includes:

the third determination module is used for determining the target torque of the engine and the target rotating speed of the engine according to the opening degree of an accelerator pedal of the vehicle;

the second determining module is further configured to:

and inquiring a preset first mapping relation according to the target torque of the engine and the target rotating speed of the engine to obtain corresponding target intake manifold pressure, wherein the preset first mapping relation is used for describing the mapping relation among the target torque of the engine, the target rotating speed of the engine and the target intake manifold pressure.

Optionally, the first control module is further configured to:

determining a pressure difference between a current intake manifold pressure and a target intake manifold pressure of a target cylinder;

inquiring a preset second mapping relation according to the pressure difference and the valve timing position of the intake valve to obtain a corresponding target operation frequency, wherein the target operation frequency refers to the frequency of the operation ventilation process of the target cylinder, and the preset second mapping relation is used for describing the correlation relation between the pressure difference and the valve timing position of the intake valve and the target operation frequency;

and controlling an intake valve and an exhaust valve of the target cylinder to be switched from a stop state to an operation state according to the target operation times.

Optionally, the first control module is further configured to:

and rounding the target running times according to a preset carry system.

Optionally, the preset second mapping relationship is obtained through the following modules:

the first calculation module is used for determining the total air quantity of the intake manifold according to the current pressure of the intake manifold and the volume of the intake manifold;

the second calculation module is used for determining the single exhaust volume of the target cylinder in a single execution ventilation process according to the standard displacement of the target cylinder, the current pressure of an intake manifold and the valve timing position of an intake valve;

the third calculation module is used for updating the current pressure of the intake manifold according to the single displacement, the total air quantity and the volume of the intake manifold and accumulating the circulation times;

the first processing module is used for entering the step of determining the total air quantity of the intake manifold according to the current intake manifold pressure and the volume of the intake manifold when the updated current intake manifold pressure does not reach the target intake manifold pressure;

and the second processing module is used for taking the cycle number as a target operation number when the updated current intake manifold pressure reaches the target intake manifold pressure so as to establish a second mapping relation among the pressure difference, the valve timing position of the intake valve and the target operation number.

Optionally, the second calculating module is further configured to:

inquiring a preset third mapping relation according to the valve timing position of the intake valve to obtain a corresponding displacement correction coefficient, and obtaining the effective displacement of the engine according to the displacement correction coefficient and the standard displacement of the engine, wherein the preset third mapping relation is used for describing the mapping relation between the valve timing position of the intake valve and the displacement correction coefficient;

and determining the single exhaust volume of the target cylinder in a single execution process according to the effective displacement and the current intake manifold pressure.

Optionally, the first control module is further configured to:

and controlling an intake valve and an exhaust valve of the target cylinder to be switched to an operation state, and updating the current pressure of the intake manifold through a pressure sensor of the target cylinder until the updated current pressure of the intake manifold reaches the target pressure of the intake manifold.

Optionally, the apparatus further comprises;

the first acquisition module is used for acquiring the running state of the vehicle;

the second acquisition module is used for acquiring a target cylinder deactivation rate of the vehicle according to a target torque of the vehicle when the vehicle needs to be switched from a coasting state to an accelerating state;

and the judging module is used for determining whether a target cylinder in a cylinder deactivation state in the engine needs to be switched to a normal state or not according to the target cylinder deactivation rate.

Compared with the prior art, the engine control method and the engine control device have the following advantages:

the embodiment of the invention provides an engine control method and device, which are applied to an engine control unit in a vehicle, and the method comprises the following steps: determining a target rotating speed, a target torque and a current intake manifold pressure of a target cylinder in a cylinder deactivation state when the target cylinder in the engine needs to be switched to a normal state; determining a target intake manifold pressure for the target cylinder based on the target speed and the target torque; controlling an intake valve and an exhaust valve of the target cylinder to switch from a stop state to an operating state to adjust a current intake manifold pressure of the target cylinder to the target intake manifold pressure; and after the current pressure of the intake manifold of the target cylinder is adjusted to the target pressure of the intake manifold, controlling a throttle valve, an oil injector and a spark plug of the target cylinder to be switched to an operation state. When the vehicle runs, if the cylinder of the engine in the cylinder deactivation state needs to be switched to the normal state, the excessive air quantity in the air inlet manifold is discharged through the transitional state of opening and closing the air inlet valve and the exhaust valve which control the operation of the target cylinder, so that the current air inlet manifold pressure of the target cylinder reaches the target air inlet manifold pressure required by the normal state, and the phenomenon that the whole vehicle rushes to move is avoided.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a flowchart illustrating steps of a method for controlling an engine according to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating steps in a method of adjusting intake manifold pressure in accordance with an embodiment of the present invention;

FIG. 3 is a logic diagram illustrating a calculation of a target number of runs according to an embodiment of the present invention;

fig. 4 is a flowchart illustrating steps of a method for obtaining a preset second mapping relationship according to an embodiment of the present invention;

FIG. 5 is a flowchart illustrating steps of a single displacement determination method according to an embodiment of the present invention;

fig. 6 is a logic diagram of a calculation of a method for obtaining a preset second mapping relationship according to an embodiment of the present invention;

FIG. 7 is a flowchart illustrating steps of a method for determining a target cylinder according to an embodiment of the present invention;

fig. 8 is a block diagram of an engine control device according to an embodiment of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In this embodiment, the operating state of the engine is divided into a full-cylinder operating state and a random cylinder deactivation operating state. The all-cylinder working state is a state that all cylinders of the engine work; the random cylinder deactivation working state refers to that in the running process of the vehicle, the engine is controlled to work at different cylinder deactivation rates and cylinder deactivation sequences according to torque requirements under different loads, namely the vehicle can randomly control part of cylinders to stop working according to different torque requirements, so that the purpose that the engine can work with the fewest cylinders on the premise of meeting the torque requirements is achieved, and the optimal working condition oil consumption of the engine can be achieved as far as possible. The embodiment of the invention mainly solves the problem that when the cylinder of an engine needs to be switched to a normal state from a cylinder deactivation state, the current pressure of an intake manifold in a target cylinder in the cylinder deactivation state is higher than the pressure of the target intake manifold due to air leakage of a throttle valve, so that a vehicle rushes.

The random cylinder deactivation working state can save the energy consumption of the engine, and the principle thereof is as follows:

the engine pushes the piston to rotate by consuming fuel oil in the working process, but the consumed fuel oil generates energy which is used for pushing the piston to rotate the crankshaft, and besides, part of the energy is taken away by high-temperature tail gas and cooling water, and part of the energy is used for overcoming friction resistance to do work, and in addition, part of the energy is used for overcoming pumping loss. Further, the larger the engine displacement, the greater the capacity loss due to friction and pumping loss, and therefore, the same torque is output and the smaller the energy loss of the small displacement engine to overcome friction and pumping loss is than that of the large displacement engine. Therefore, if the engine is controlled to operate at a low load, that is, when the target torque is small, the torque output by the cylinders which are partially closed and are ensured to continue operating can meet the target torque demand of the engine, and since the partial cylinders are closed, which corresponds to the reduction of the displacement of the engine, the pumping loss and the friction loss can be reduced.

It can be seen that the working principle of the random cylinder deactivation working state is equivalent to dynamically adjusting the displacement of the engine according to different working conditions, thereby realizing the reduction of the energy consumption of the engine. In order to achieve the random cylinder deactivation operating state, each cylinder of the engine should have an intake valve and an exhaust valve that can be closed or opened individually at any time.

In order to realize the random cylinder deactivation working state, each cylinder of the engine is provided with an intake valve, an exhaust valve, an oil nozzle and an ignition device which can be independently opened and closed, so that the intake and the exhaust of any cylinder can be stopped by closing the intake valve and the exhaust valve at any time, and the ignition and the oil injection are simultaneously stopped, thereby realizing the random cylinder deactivation effect.

Specifically, the control process of the random cylinder deactivation of the embodiment may include: acquiring a target torque of an engine; determining whether a random cylinder deactivation working state needs to be entered; if the random cylinder deactivation working state needs to be entered, determining the running state of the vehicle; when the running state of the vehicle is a steady state, determining a target cylinder deactivation rate corresponding to the target torque according to the target torque; when the running state of the vehicle is transient, determining a target cylinder deactivation rate corresponding to the target torque according to the target torque and the acceleration and deceleration state of the vehicle; the acceleration and deceleration state comprises an acceleration state and a deceleration state, and the target cylinder deactivation rate corresponding to the acceleration state is greater than the target cylinder deactivation rate corresponding to the deceleration state; and controlling the engine to work according to the target cylinder deactivation rate.

The method comprises the following steps that different cylinder deactivation rates correspond to different outer characteristic curve graphs, the outer characteristic curve graphs are determined by torque and engine rotating speed, and a preset optimal oil consumption area is arranged in the outer characteristic curve graphs and is obtained in advance according to actual use. Because the outer characteristic curve chart is determined by the torque and the engine rotating speed, and the preset optimal oil consumption area is arranged in the outer characteristic curve chart, after the condition that the engine needs to enter the random cylinder deactivation working state is determined, the corresponding target cylinder deactivation rate is determined according to the target torque and the current rotating speed, so that the target torque is in the optimal oil consumption area of the outer characteristic curve chart, the target torque can be input into the engine, and the engine can work in the optimal oil consumption state on the premise of outputting the target torque, so that the oil consumption is saved. When the vehicle is switched to an acceleration state, the current intake manifold pressure of a target cylinder in the cylinder deactivation state is overhigh due to air leakage of a throttle valve, so that the vehicle rushes.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1, an embodiment of the present invention provides an engine control method applied to an engine control unit in a vehicle, which may include:

step 101, when a target cylinder in a cylinder deactivation state in an engine needs to be switched to a normal state, determining a target rotating speed, a target torque and a current intake manifold pressure of the target cylinder of the vehicle.

In practical applications, the vehicle may have a plurality of different driving states, such as a normal driving state, an acceleration state, a coasting state, and a braking state. The coasting state refers to a driving state of the vehicle when the driver does not step on the accelerator pedal or the accelerator pedal is opened to the maximum (of course, the accelerator pedal opening corresponding to different vehicles in the coasting state may be determined according to actual conditions), and the brake pedal is not operated; the acceleration state refers to a state in which the driver steps on the accelerator pedal more largely to enable the vehicle to run with acceleration; the braking state refers to a state in which the driver steps on a brake pedal to enable the vehicle to stop running; the normal running state is a state in which the driver steps on the accelerator pedal or the accelerator pedal opening is not at the maximum, but the target torque of the engine is not changed.

When the vehicle is in a normal driving state or a coasting state, the engine is switched to a random cylinder deactivation state according to a target torque required to be output, so that energy consumption is reduced, but when the vehicle is switched to an acceleration state from a slipping state or a normal driving state, the current intake manifold pressure in a target cylinder in the cylinder deactivation state is higher than the target intake manifold pressure due to air leakage of a throttle valve, and the vehicle rushes during acceleration.

When the vehicle is in a sliding state or a normal running state, determining a target cylinder deactivation rate corresponding to the target torque according to the target torque, controlling the engine to work at different cylinder deactivation rates and cylinder deactivation sequences according to the target cylinder deactivation rate, and when the vehicle needs to run in an accelerated manner, randomly controlling part of cylinders to stop working by searching the corresponding target cylinder deactivation rate according to the target torque so as to realize the working with the least cylinders on the premise of meeting the torque requirement, so that the engine can realize the optimal working condition oil consumption as much as possible; however, when the vehicle is switched from the coasting state or the normal driving state to the acceleration state, the cylinder in the cylinder deactivation state before exists due to the change of the cylinder deactivation rate, and the throttle valve corresponding to the cylinder is closed and the intake and exhaust valves are closed when the cylinder in the cylinder deactivation state before exists, and the engine stops injecting and igniting. At the moment, a certain air leakage amount exists in the throttle valve, air leaks into the air inlet manifold from the front of the throttle valve, and the pressure in the air inlet manifold of the engine is gradually increased from a state of being lower than the atmospheric pressure before sliding to be close to the atmospheric pressure.

During acceleration, the manifold pressure is adjusted to the required air pressure because the manifold pressure is larger than the required air pressure, otherwise, the direct air intake can cause the whole vehicle to run.

Based on the above, the invention provides that before the target cylinder is recovered from the cylinder deactivation state to the normal state, the target cylinder is controlled to enter the transitional state of opening the intake valve and the exhaust valve, and the redundant air quantity in the intake manifold is exhausted, so that the pressure of the manifold is adjusted to the required air pressure.

To this end, the present invention adjusts the manifold pressure to the desired air pressure by setting a transition state before the target cylinder is restored from the cylinder deactivation state to the normal state. Specifically, the cylinder deactivation state of the target cylinder refers to that an intake valve, an exhaust valve, a throttle valve, a spark plug and an oil injector of the target cylinder are in a stop state, and the normal state of the target cylinder refers to that the intake valve, the exhaust valve, the throttle valve, the spark plug and the oil injector of the target cylinder are in an operation state; the transient state of the target cylinder means that the intake valve and the exhaust valve of the target cylinder are in an operating state and the throttle valve, the ignition plug, and the injector are in a stopped state.

In the embodiment of the present invention, the stop state of the intake valve means that the intake valve is closed, the stop state of the exhaust valve means that the exhaust valve is closed, the stop state of the throttle valve means that the throttle valve is closed, the stop state of the injector means that fuel injection is stopped, and the stop state of the ignition plug means that ignition is stopped. When the driver releases the accelerator and does not brake the vehicle during the running of the vehicle, the power required by the engine is reduced, in order to reduce energy consumption, the engine switches partial cylinders to a cylinder deactivation state, an injector of the cylinder in the cylinder deactivation state stops injecting oil and an ignition plug stops igniting, a throttle valve, an intake valve and an exhaust valve of the cylinder are closed, and the vehicle enters a coasting state.

In the embodiment of the invention, the target cylinder refers to the cylinder in the engine which needs to be switched to the normal state from the current cylinder deactivation state due to the change of the engine cylinder deactivation rate.

When the driver steps on the accelerator pedal when the vehicle is in a sliding state or steps on the accelerator pedal more greatly when the vehicle is in a normal running state, the engine control unit determines the target torque required to be output by the engine according to the opening degree of the accelerator pedal, wherein the smaller the opening degree of the accelerator pedal, the larger the target torque of the engine output by the engine is, namely the opening degree of the accelerator pedal is in a negative correlation with the target torque of the engine. Since the target cylinder has a certain amount of air leakage in the throttle valve in the cylinder deactivation state, so that the air pressure in the intake manifold of the target cylinder gradually approaches the atmospheric pressure, and the target intake manifold pressure required in the normal state of the target cylinder in practical application is lower than the atmospheric pressure, it is necessary to eliminate the excessive air amount in the intake manifold based on the target torque and the current intake manifold pressure of the target cylinder, so that the pressure in the intake manifold is quickly adjusted to the target intake manifold pressure required by the target torque.

Step 102, determining a target intake manifold pressure of the target cylinder according to the target rotating speed and the target torque.

In the embodiment of the invention, the target intake manifold pressure required by different vehicles and engines at the target torque and the target speed can be collected through experiments, and the required intake manifold pressure of the engine of the vehicle at different torques and speeds can be collected through experiments, so that the target intake manifold pressure can be determined through inquiry in actual application.

Optionally, before the step 102, the method further includes:

and S1, determining the target torque of the engine and the target rotating speed of the engine according to the opening degree of an accelerator pedal of the vehicle.

In the embodiment of the invention, because the opening degree of the accelerator pedal and the target torque and the target rotating speed of the engine are in a negative correlation relationship, the target torque and the target rotating speed of the engine can be determined by inquiring the mapping relationship between the opening degree of the accelerator pedal and the target torque and the target rotating speed, and the mapping relationship between the opening degree of the accelerator pedal and the target torque and the target rotating speed can be measured through experiments and used for subsequent inquiry.

The step 102 includes:

s2, inquiring a preset first mapping relation according to the target torque of the engine and the target rotating speed of the engine to obtain corresponding target intake manifold pressure, wherein the preset first mapping relation is used for describing the mapping relation among the target torque of the engine, the target rotating speed of the engine and the target intake manifold pressure.

In the embodiment of the invention, as the target torque of the engine is larger, the pressure of the target intake manifold required by the target cylinder is smaller, and the rotating speed of the engine is higher, the pumping action of the piston during air intake is larger, so that experiments can be carried out according to different vehicles and engines, the target intake manifold pressure required by different engines under different torques and engine rotating speeds can be measured, and a first mapping relation among the target torque of the engine, the rotating speed of the engine and the target intake manifold pressure is established, so as to generate the target intake manifold pressure linear relation graph according to the first mapping relation. In practical applications, after obtaining the target torque of the engine, the engine control unit may directly query the first mapping relationship to obtain the required target intake manifold pressure.

And 103, controlling an intake valve and an exhaust valve of the target cylinder to be switched from a stop state to an operation state so as to adjust the current intake manifold pressure of the target cylinder to the target intake manifold pressure.

In the embodiment of the invention, since the target cylinder is in the cylinder deactivation state, although the spark plug and the injector are in the stop state, the piston thereof can rotate along with the inertia of the vehicle, after the target intake valve and the exhaust valve of the target cylinder are switched to the operation state, the intake valve and the exhaust valve perform the periodical opening and closing operation along with the movement of the piston, so that the target cylinder executes the gas exchange process, and at the moment, the gas exchange process of the target cylinder is an idle process because the target cylinder does not ignite and inject fuel, and power is not actually output. Along with the operation of the gas exchange process in which the piston, the intake valve and the exhaust valve in the target cylinder are matched with each other, the air in the target cylinder is gradually exhausted, so that the pressure of the intake manifold of the target cylinder is reduced, and the current pressure of the intake manifold gradually reaches the target pressure of the intake manifold.

And 104, after the current pressure of the intake manifold of the target cylinder is adjusted to the target pressure of the intake manifold, controlling a throttle valve, an oil injector and a spark plug of the target cylinder to be switched to an operation state.

In the embodiment of the invention, when the engine control unit confirms that the current intake manifold pressure of the target cylinder reaches the target intake manifold pressure, the engine control unit can control the throttle valve of the target cylinder to open and control the fuel injector to inject fuel and the spark plug to ignite, so that the target cylinder is switched to a normal state, and the vehicle cannot run due to overhigh pressure of the intake manifold because the pressure in the intake manifold in the engine reaches the target intake manifold pressure.

Optionally, referring to fig. 2, the step 103 includes:

and a sub-step 1031 of determining a pressure difference between the current intake manifold pressure and the target intake manifold pressure of the target cylinder.

And a sub-step 1032 of querying a preset second mapping relation according to the pressure difference and the valve timing position of the intake valve to obtain a corresponding target operation frequency, wherein the target operation frequency refers to the frequency of the operation ventilation process of the target cylinder, and the preset second mapping relation is used for describing a correlation relation between the pressure difference and the valve timing position of the intake valve and the target operation frequency.

In the embodiment of the invention, the ventilation process of the target cylinder refers to that the piston, the intake valve and the exhaust valve of the target cylinder run for one cycle in a matching way, and can be determined by the cycle number of the rotation of the piston, and correspondingly, the opening and closing times of the intake valve and the exhaust valve can also be determined by the opening and closing times of the intake valve and the exhaust valve in one cycle of the rotation of the piston, and the opening and closing times of the intake valve and the exhaust valve can be. The determination of the valve timing positions of the intake valve and the exhaust valve in the target cylinder may be specifically performed, which is only an exemplary illustration, and how to determine the operation number of the ventilation process of the target cylinder may be determined according to actual requirements, and is not limited herein. The current intake manifold pressure may be measured by the engine control unit via a pressure sensor mounted in the intake manifold. The engine control unit may query the VVT (Variable Valve Timing) system to determine the Valve Timing position of the intake Valve. Because the existing automobile engine mostly adopts electromagnetic control to close the exhaust valve and the intake valve, the valve timing positions of the intake valve and the exhaust valve can be adjusted according to different engine output torque requirements, and the air quantity exhausted and sucked by the target cylinder in each opening and closing of the intake valve and the exhaust valve can also be changed along with the different valve timing positions, so that the target operation times required under the valve timing positions and the pressure differences of the different intake valves can be measured through experiments aiming at different vehicles and engines, and the second mapping relation among the valve timing positions, the pressure differences and the target operation times of the intake valves can be obtained. The engine control unit may quickly look up the second map after confirming the valve timing position of the intake valve, the pressure difference each time, thereby confirming the target number of operations.

And a substep 1033 of rounding the target running times according to a preset carry system.

In the embodiment of the present invention, the number of times of opening and closing the intake valve and the exhaust valve of the target cylinder may be counted only in an integer number, but the target number of times of operation of the target torque of the engine corresponding to the preset second map is not necessarily an integer, and therefore, it is necessary to perform rounding processing on the preliminarily obtained target number of times of operation. In practical application, because it is necessary to ensure that the current intake manifold pressure is as close as possible to the target intake manifold pressure, directly discarding the digit after the integral digit of the target operation frequency may cause the engine to crash in the actual acceleration process, and therefore, a preset carry system may be set according to the actual situation of the actual engine to round the target operation frequency, for example: when one digit after the decimal point is greater than 6, the integer digit is added with 1, and is discarded if the digit is less than or equal to the integer digit, and the determination can be specifically performed according to the actual requirement, and the preset carry system is not specifically limited here.

And a substep 1034 of controlling the intake valve and the exhaust valve of the target cylinder to be switched from a stop state to an operating state according to the target operation times.

This step can refer to the detailed description of step 103, which is not repeated herein.

Referring to fig. 3, a logic diagram for calculating a target operation frequency according to an embodiment of the present invention is shown, in which a first mapping relationship B3 (target intake manifold pressure line graph) is queried according to a target torque B1 and a rotation speed value B2 of an engine to obtain a target intake manifold pressure B4, a current intake manifold pressure B7 is obtained through a pressure sensor B6, a pressure difference is obtained by subtracting the target intake manifold pressure B4 from the current intake manifold pressure B7, a second mapping relationship is queried according to the pressure difference and a valve timing position B5 of an intake valve to perform a step of calculating B8 of an operation frequency in a coasting state, so as to obtain a target operation frequency B9, and finally a step of rounding B10 is performed on the target operation frequency B9.

Alternatively, referring to fig. 4, the preset second mapping relationship is obtained by the following sub-steps 10321 to 10325:

substep 10321 determines a total air flow from the intake manifold based on the current intake manifold pressure and a volume of the intake manifold.

Substep 10322 determining a single displacement of said target cylinder for a single execution of a scavenging event based on said target cylinder's standard displacement and current intake manifold pressure, and valve timing position of the intake valve.

In an embodiment of the present invention, the engine control unit may query the VVT to determine the valve timing position of the intake valve. Because the existing vehicle engine mostly adopts electromagnetic control to close the exhaust valve and the intake valve, the valve timing positions of the intake valve and the exhaust valve can be adjusted according to different engine output torque requirements, and the air quantity discharged and sucked by the target cylinder in each opening and closing of the intake valve and the exhaust valve can be changed along with the different valve timing positions.

After each opening and closing operation of the intake valve and the exhaust valve of the target cylinder, the air quantity discharged by the target cylinder is equal to the standard discharge capacity of the target cylinder, so that an ideal gas state equation (1) is obtained:

p V R T, M V/R T (1)

M is the molar mass of the gas, P is the pressure, V is the manifold volume, R is a constant, T is the temperature in Kelvin, and the standard displacement and the current intake manifold pressure of the target cylinder are taken in, so that the single exhaust volume exhausted by the target cylinder in each scavenging process can be determined under the current intake manifold pressure. And the total air quantity of the intake manifold can be obtained by substituting the current pressure of the intake manifold and the volume of the intake manifold into the ideal gas state equation. It will be appreciated that the standard displacement may be determined for different types of target cylinders.

Substep 10323, updating said current intake manifold pressure based on said single displacement, total air volume, and intake manifold volume, and accumulating cycle times.

In the implementation of the present invention, after the target cylinder performs one ventilation process, the current total air volume in the intake manifold is reduced, and the corresponding current intake manifold pressure is reduced, so that the above-mentioned ideal gas state equation (1) needs to be substituted according to the residual air volume of the intake manifold and the volume of the intake manifold, the current manifold pressure needs to be updated, and after one update, the cycle number is increased by 1 and recorded.

Substep 10324, entering the step of determining a total air flow from the current intake manifold pressure and an intake manifold volume when the updated current intake manifold pressure does not reach the target intake manifold pressure.

In the embodiment of the present invention, after obtaining the current intake manifold pressure, the engine control unit compares the updated current intake manifold pressure of the engine with the target intake manifold pressure to determine whether the current intake manifold pressure has reached the target intake manifold pressure.

In the present embodiment, if the current ongoing manifold pressure does not reach the target intake manifold pressure, the sub-step 10321 is continued, and the scavenging process is continued to be performed by controlling the target valve to exhaust the extra air in the target cylinder until the current intake manifold pressure reaches the target intake manifold pressure.

Sub-step 10325, when the updated current intake manifold pressure reaches the target intake manifold pressure, using the number of cycles as a target number of operations, thereby establishing a second mapping relationship between the pressure difference, the valve timing position of the intake valve, and the target number of operations.

In the embodiment of the invention, if the updated current intake manifold pressure reaches the target intake manifold pressure, the target cylinder is determined to reach the target intake manifold pressure after the cycle number is operated, the cycle number is taken as the target operation number, the pressure difference between the current intake manifold pressure before the ventilation process and the target intake manifold pressure is determined at the moment, and a second mapping relation among the pressure difference, the valve timing position of the intake valve and the target operation number is established for subsequent inquiry.

Optionally, referring to fig. 5, the sub-step 10322 includes:

and a substep 103221, querying a preset third mapping relation according to the valve timing position of the intake valve to obtain a corresponding displacement correction coefficient, and obtaining the effective displacement of the engine according to the displacement correction coefficient and the standard displacement of the engine, wherein the preset third mapping relation is used for describing the mapping relation between the valve timing position of the intake valve and the displacement correction coefficient.

In the embodiment of the invention, the displacement correction coefficient is used for reflecting the mapping relation between the standard displacement and the effective displacement of the target cylinder, and the discharged and sucked air volumes of each motion cycle of the piston can be changed along with the change of the standard displacement and the effective displacement of the target cylinder, so that an experiment can be carried out according to the valve timing positions of different intake valves, the standard displacement and the actual displacement of the engine are counted, the displacement correction coefficient is obtained, and a third mapping relation between the displacement correction coefficient and the opening degree of the exhaust valve is established, so that a displacement correction coefficient table containing the third mapping relation is generated. And the engine control unit acquires a corresponding displacement correction coefficient after inquiring the displacement correction coefficient table according to the valve timing position of the intake valve, and then multiplies the displacement correction coefficient by the standard displacement of the engine to obtain the effective displacement of the engine at the valve timing position of the current intake valve.

And a substep 103222 of determining a single displacement for a single execution of a stroke of the target cylinder based on the effective displacement and a current intake manifold pressure.

In the embodiment of the invention, the single displacement of the target cylinder at the current valve timing position of the intake valve can be obtained by substituting the effective displacement and the current intake manifold pressure into the ideal gas state equation (1).

In practical application, referring to fig. 6, a calculation logic diagram of a method for obtaining a preset second mapping relation is shown, first, a third mapping relation is queried according to a valve timing position a1 of an intake valve to obtain an effective displacement coefficient A3 and multiplied by a standard displacement a2 to obtain an effective displacement a4, then, a single exhaust amount a11 is calculated according to the effective displacement a4 and a current intake manifold pressure a5 (where the current intake manifold pressure varies with the number of cycles), then, a total intake manifold air amount A8 is calculated according to the current intake manifold pressure A6 and a volume a7 of the intake manifold, then, the single exhaust amount a11 is subtracted from the total intake manifold air amount A8 to obtain a residual intake manifold air amount a9, and the current intake manifold pressure a10 is updated according to the volume of the intake manifold. And using the obtained updated current intake manifold pressure a10 as the current intake manifold pressure a6 and the current intake manifold pressure a5, and repeating the above steps until the current manifold pressure reaches the target intake manifold pressure.

Optionally, the step 103 may include: and controlling an intake valve and an exhaust valve of the target cylinder to be switched to an operation state, and updating the current pressure of the intake manifold through a pressure sensor of the target cylinder until the updated current pressure of the intake manifold reaches the target pressure of the intake manifold.

In the embodiment of the invention, the current intake manifold pressure of the target cylinder can be detected and updated in real time through the pressure sensor in the target cylinder in the process of executing the ventilation process, so that the target cylinder can be switched to the normal state under the condition that the latest current intake manifold pressure is detected to reach the target intake manifold pressure.

Optionally, before the step 101 with reference to fig. 7, the method further includes:

step 105, acquiring the running state of the vehicle.

In the embodiment of the present invention, the vehicle form state may include a normal driving state, a coasting state, a braking state, and the like, and specific reference may be made to the detailed description of the driving state in step 101, which is not described herein again.

And 106, when the vehicle needs to be switched from a coasting state to an accelerating state, acquiring a target cylinder deactivation rate of the vehicle according to the target torque of the vehicle.

In the embodiment of the invention, when the vehicle is switched from the coasting state or the normal running state to the acceleration state, the target torque required to be output by the engine is increased, so that the engine needs to increase the number of working cylinders in the engine by adjusting the cylinder deactivation rate. The different cylinder deactivation rates correspond to different external characteristic curve graphs, the external characteristic curve graphs are determined by torque and engine rotating speed, and the external characteristic curve graphs are provided with preset optimal oil consumption areas which are obtained in advance according to actual use. The target cylinder deactivation rate may be determined from an outer map that falls within the optimal fuel consumption region based on the target torque and the engine speed.

And step 107, determining whether a target cylinder in a cylinder deactivation state in the engine needs to be switched to a normal state according to the target cylinder deactivation rate.

In the embodiment of the invention, when the vehicle is switched from the coasting state or the normal driving state to the acceleration state, the target torque to be output by the engine is increased, so that the cylinder deactivation rate is reduced, and the target cylinder in the cylinder deactivation state is switched to the normal state to increase the number of cylinders in the normal state of the engine. The embodiment of the invention can ensure that the engine can output the target torque, and simultaneously, the engine can work in the optimal oil consumption state on the premise of outputting the target torque, thereby saving oil consumption.

In the engine control method provided by the embodiment of the invention, when the cylinder of the engine in a cylinder deactivation state needs to be switched to a normal state in the running process of a vehicle, the excessive air quantity in an air inlet manifold is discharged by controlling the transition state of opening and closing of an air inlet valve and an air outlet valve operated by a target cylinder, so that the current air inlet manifold pressure of the target cylinder reaches the target air inlet manifold pressure required by the normal state, and the phenomenon that the whole vehicle rushes is avoided.

Referring to fig. 8, there is shown an engine control apparatus 20 applied to an engine control unit in a vehicle, the apparatus including:

the first determination module 201 is used for determining a target rotating speed, a target torque and a current intake manifold pressure of a target cylinder in a cylinder deactivation state when the target cylinder in an engine needs to be switched to a normal state.

A second determination module 202 determines a target intake manifold pressure for the target cylinder based on the target speed and the target torque.

The first control module 203 controls an intake valve and an exhaust valve of the target cylinder to switch from a deactivated state to an activated state to adjust a current intake manifold pressure of the target cylinder to the target intake manifold pressure.

The second control module 204 is configured to control a throttle, an injector, and a spark plug of the target cylinder to switch to an operating state after the current intake manifold pressure of the target cylinder is adjusted to the target intake manifold pressure.

Optionally, the apparatus further includes:

the third determination module 205 is configured to determine a target torque of the engine and a target rotation speed of the engine according to an accelerator pedal opening of the vehicle.

The second determining module 202 is further configured to:

and inquiring a preset first mapping relation according to the target torque of the engine and the target rotating speed of the engine to obtain corresponding target intake manifold pressure, wherein the preset first mapping relation is used for describing the mapping relation among the target torque of the engine, the target rotating speed of the engine and the target intake manifold pressure.

Optionally, the first control module 203 is further configured to:

determining a pressure difference between a current intake manifold pressure and a target intake manifold pressure of a target cylinder;

inquiring a preset second mapping relation according to the pressure difference and the valve timing position of the intake valve to obtain a corresponding target operation frequency, wherein the target operation frequency refers to the frequency of the operation ventilation process of the target cylinder, and the preset second mapping relation is used for describing the correlation relation between the pressure difference and the valve timing position of the intake valve and the target operation frequency;

and controlling an intake valve and an exhaust valve of the target cylinder to be switched from a stop state to an operation state according to the target operation times.

Optionally, the first control module 203 is further configured to:

and rounding the target running times according to a preset carry system.

Optionally, the preset second mapping relationship is obtained through the following modules:

the first calculation module 206 is configured to determine a total air amount of the intake manifold according to the current intake manifold pressure and a volume of the intake manifold.

And the second calculation module 207 is used for determining the single exhaust volume of the target cylinder for performing the scavenging process once according to the standard displacement of the target cylinder, the current pressure of the intake manifold and the valve timing position of the intake valve.

And a third calculation module 208 for updating the current intake manifold pressure according to the single displacement, the total air volume, and the intake manifold volume, and accumulating the number of cycles.

And a first processing module 209, configured to enter the step of determining the total air volume of the intake manifold according to the current intake manifold pressure and the volume of the intake manifold when the updated current intake manifold pressure does not reach the target intake manifold pressure.

A second processing module 210 for establishing a second mapping relationship between the pressure difference, the valve timing position of the intake valve, and the target number of operations by taking the number of cycles as the target number of operations when the updated current intake manifold pressure reaches the target intake manifold pressure.

Optionally, the second calculating module 207 is further configured to:

inquiring a preset third mapping relation according to the valve timing position of the intake valve to obtain a corresponding displacement correction coefficient, and obtaining the effective displacement of the engine according to the displacement correction coefficient and the standard displacement of the engine, wherein the preset third mapping relation is used for describing the mapping relation between the valve timing position of the intake valve and the displacement correction coefficient;

and determining the single exhaust volume of the target cylinder in a single execution process according to the effective displacement and the current intake manifold pressure.

Optionally, the first control module 203 is further configured to:

and controlling an intake valve and an exhaust valve of the target cylinder to be switched to an operation state, and updating the current pressure of the intake manifold through a pressure sensor of the target cylinder until the updated current pressure of the intake manifold reaches the target pressure of the intake manifold.

Optionally, the apparatus further includes.

The first obtaining module 211 is configured to obtain a driving state of the vehicle.

A second obtaining module 212, configured to obtain a target cylinder deactivation rate of the vehicle according to a target torque of the vehicle when the vehicle needs to be switched from a coasting state to an acceleration state.

And the judging module 213 is configured to determine whether a target cylinder in a cylinder deactivation state in the engine needs to be switched to a normal state according to the target cylinder deactivation rate.

The embodiment of the invention provides an engine control device, which is used for discharging the surplus air quantity in an air inlet manifold by controlling the opening and closing transition state of an air inlet valve and an air outlet valve which are operated by a target cylinder when the cylinder of an engine in a cylinder deactivation state needs to be switched to a normal state in the running process of a vehicle, so that the current air inlet manifold pressure of the target cylinder reaches the target air inlet manifold pressure required by the normal state, and the phenomenon that the whole vehicle rushes is avoided.

The embodiment of the present invention further provides a vehicle, which may specifically include: the engine control unit described above.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.