阅读说明：本技术 一种增程器的控制方法、控制系统及车辆 (Control method and control system of range extender and vehicle ) 是由 曲龙 郭英伟 于 2020-12-08 设计创作，主要内容包括：本发明提供了一种增程器的控制方法、控制系统及车辆,涉及车辆增程器领域。本发明先获取汽油机颗粒捕集器的工作参数,然后根据工作参数判断汽油机颗粒捕集器是否达到再生条件,若是,则启动再生程序,再生程序包括控制发动机断油、且控制发电机拖动发动机以预设转速进行空转,从而使得进入发动机的空气通过发动机的排气系统进入到汽油机颗粒捕集器中,以提高汽油机颗粒捕集器中的氧气含量。本发明在GPF再生时通过控制发电机倒拖发动机空转(此时燃油系统没有喷油参与燃烧,进入发动机的氧气全部进入排气系统),从而可以为颗粒物燃烧提供富余的氧气,提高GPF再生效率。(The invention provides a control method and a control system of a range extender and a vehicle, and relates to the field of vehicle range extenders. The method comprises the steps of firstly obtaining working parameters of the gasoline engine particle trap, then judging whether the gasoline engine particle trap reaches regeneration conditions or not according to the working parameters, and if so, starting a regeneration program, wherein the regeneration program comprises the steps of controlling the engine to cut off oil and controlling a generator to drive the engine to idle at a preset rotating speed, so that air entering the engine enters the gasoline engine particle trap through an exhaust system of the engine, and the oxygen content in the gasoline engine particle trap is increased. According to the invention, when GPF is regenerated, the generator is controlled to drag the engine to idle (at the moment, the fuel oil system does not inject fuel to participate in combustion, and oxygen entering the engine completely enters the exhaust system), so that surplus oxygen can be provided for combustion of particulate matters, and the GPF regeneration efficiency is improved.)

1. A control method of a range extender is characterized by comprising the following steps:

acquiring working parameters of the gasoline engine particle catcher;

judging whether the gasoline engine particle catcher reaches a regeneration condition or not according to the working parameters;

if so, starting a regeneration program, wherein the regeneration program comprises the steps of controlling the oil cut-off of the engine and controlling the generator to drive the engine to idle at a preset rotating speed, so that the air entering the engine enters the gasoline engine particle trap through an exhaust system of the engine, and the oxygen content in the gasoline engine particle trap is improved.

2. The control method according to claim 1,

the operating parameter includes at least one of a particulate value and a pressure value in the gasoline engine particulate trap.

3. The control method according to claim 1,

the preset rotating speed is any value within the range of 3500 rpm-4000 rpm.

4. The control method of claim 1, wherein when the gasoline engine particulate trap reaches a regeneration condition and before the step of controlling initiation of a regeneration sequence, the control method further comprises:

acquiring the running parameters of the vehicle;

judging whether the vehicle is in a high-power demand state according to the running parameters of the vehicle, wherein the high-power demand state is that the power demand of the vehicle is higher than a preset power value;

if yes, the regeneration procedure is not started.

5. The control method according to claim 2, wherein the step of determining whether the gasoline engine particulate trap reaches a regeneration condition based on the operating parameter comprises:

judging whether the particle value in the gasoline engine particle catcher is larger than a first preset threshold value or not;

if yes, the gasoline engine particle catcher is judged to reach the regeneration condition.

6. The control method according to claim 5, characterized in that after the step of starting the regeneration procedure, the control method further comprises:

judging whether the particle value in the gasoline engine particle trap is smaller than a second preset threshold value, wherein the second preset threshold value is smaller than the first preset threshold value;

and if so, controlling the engine to stop idling.

7. The control method according to claim 2, wherein the step of determining whether the gasoline engine particulate trap reaches a regeneration condition based on the operating parameter comprises:

judging whether the pressure value in the gasoline engine particle catcher is larger than a first preset pressure value or not;

if yes, the gasoline engine particle catcher is judged to reach the regeneration condition.

8. The control method according to claim 7, characterized in that after the step of starting the regeneration procedure, the control method further comprises:

judging whether the pressure value in the gasoline engine particle trap is smaller than a second preset pressure value or not, wherein the second preset pressure value is smaller than the first preset pressure value;

and if so, controlling the engine to stop idling.

9. A control system for a range extender, comprising:

the acquisition module is used for acquiring the working parameters of the gasoline engine particle trap; and

a control module comprising a memory and a processor, the memory having stored therein a computing program, the computing program when executed by the processor being for implementing the control method according to any one of claims 1-8.

10. A vehicle, characterized in that the vehicle is equipped with a control system according to claim 9.

Technical Field

The invention relates to the field of vehicle range extenders, in particular to a control method and a control system of a range extender and a vehicle.

Background

With the development of the automobile industry, more and more manufacturers are beginning to produce extended range automobiles. The engines used by the range extender are mostly gasoline engines, the particulate matter emission of the gasoline engines is one of the pollutants needing to be controlled in automobile emissions, and particularly the gasoline engines with direct injection in cylinders. With the upgrading of national emission regulations, the six-state emission regulations stage increases the control requirement of the amount of particulate matter. In order to effectively reduce the particulate matter emission, technologies such as high injection pressure, multi-hole injectors and the like are available in the market, and the technologies mainly improve the original particulate matter emission of the engine, and the effect of the technologies depends on the engine foundation and the matching level. The Gasoline engine particle trap (GPF) is a technology for reducing the emission of Particulate matters from the perspective of emission post-treatment, the filtering efficiency can reach 90%, and meanwhile, the quantity of the Particulate matters can be effectively controlled. Most vehicles in the sixth stage of China have the GPF configuration, and with the tightening of emission regulations, most gasoline range extenders are predicted to be configured with the GPF.

The extended-range engine of the GPF is configured at the present stage, and the control of the GPF regeneration process is to control the fuel cut-off of the engine according to the traditional fuel vehicle control strategy, so that the increase of the air quantity is realized, and the surplus air enters the GPF to provide air for the oxidation regeneration of particulate matters. The existing gasoline engine regeneration strategy is to increase the air quantity by fuel cut-off of the engine, the process time is too short, the air quantity entering the GPF to participate in combustion is small, the oxidation combustion time of particulate matters is short, and the efficiency of the GPF regeneration process is low.

Disclosure of Invention

The invention aims to provide a control system of a range extender, which solves the technical problem of low regeneration efficiency of a gasoline engine particle trap in the prior art.

It is a further object of the first aspect of the invention to ensure proper operation of the vehicle.

It is an object of a second aspect of the present invention to provide a control system for a range extender.

An object of a third aspect of the invention is to provide a vehicle having the control system described above.

According to an object of a first aspect of the present invention, there is provided a control method of a range extender, including:

acquiring working parameters of the gasoline engine particle catcher;

judging whether the gasoline engine particle catcher reaches a regeneration condition or not according to the working parameters;

if so, starting a regeneration program, wherein the regeneration program comprises the steps of controlling the oil cut-off of the engine and controlling the generator to drive the engine to idle at a preset rotating speed, so that the air entering the engine enters the gasoline engine particle trap through an exhaust system of the engine, and the oxygen content in the gasoline engine particle trap is improved.

Optionally, the operating parameter comprises at least one of a particulate value and a pressure value in the gasoline engine particulate trap.

Optionally, the preset rotation speed is any value in a range of 3500rpm to 4000 rpm.

Optionally, when the gasoline engine particulate trap reaches a regeneration condition and before the step of initiating a regeneration sequence, the control method further comprises:

acquiring the running parameters of the vehicle;

judging whether the vehicle is in a high-power demand state according to the running parameters of the vehicle, wherein the high-power demand state is that the power demand of the vehicle is higher than a preset power value;

if yes, the regeneration procedure is not started.

Optionally, the step of determining whether the gasoline engine particulate trap reaches a regeneration condition according to the operating parameter specifically includes:

judging whether the particle value in the gasoline engine particle catcher is larger than a first preset threshold value or not;

if yes, the gasoline engine particle catcher is judged to reach the regeneration condition.

Optionally, after the step of initiating the regeneration procedure, the control method further comprises:

judging whether the particle value in the gasoline engine particle trap is smaller than a second preset threshold value, wherein the second preset threshold value is smaller than the first preset threshold value;

and if so, controlling the engine to stop idling.

Optionally, the step of determining whether the gasoline engine particulate trap reaches a regeneration condition according to the operating parameter specifically includes:

judging whether the pressure value in the gasoline engine particle catcher is larger than a first preset pressure value or not;

if yes, the gasoline engine particle catcher is judged to reach the regeneration condition.

Optionally, after the step of initiating the regeneration procedure, the control method further comprises:

judging whether the pressure value in the gasoline engine particle trap is smaller than a second preset pressure value or not, wherein the second preset pressure value is smaller than the first preset pressure value;

and if so, controlling the engine to stop idling.

According to an object of the second aspect of the present invention, the present invention also provides a control system of a range extender, comprising:

the acquisition module is used for acquiring the working parameters of the gasoline engine particle trap; and

the control module comprises a memory and a processor, wherein the memory stores a calculation program, and the calculation program is used for realizing the control method when being executed by the processor.

According to an object of a third aspect of the invention, the invention further provides a vehicle equipped with the control system described above.

The method comprises the steps of firstly obtaining working parameters of the gasoline engine particle trap, then judging whether the gasoline engine particle trap reaches regeneration conditions or not according to the working parameters, and if so, starting a regeneration program, wherein the regeneration program comprises the steps of controlling the engine to cut off oil and controlling a generator to drive the engine to idle at a preset rotating speed, so that air entering the engine enters the gasoline engine particle trap through an exhaust system of the engine, and the oxygen content in the gasoline engine particle trap is increased. According to the invention, when GPF is regenerated, the generator is controlled to drag the engine to idle (at the moment, the fuel oil system does not inject fuel to participate in combustion, and oxygen entering the engine completely enters the exhaust system), so that surplus oxygen can be provided for combustion of particulate matters, and the GPF regeneration efficiency is improved.

Further, the method also comprises the steps of obtaining the running parameters of the vehicle before the step of starting the regeneration program, and then judging whether the vehicle is in a high-power demand state according to the running parameters of the vehicle, wherein the high-power demand state is that the power demand of the vehicle is higher than a preset power value, and if so, the regeneration program is not started. Therefore, the regeneration program is not started when the vehicle is in a high-power demand state, so that the normal operation of the vehicle can be ensured.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

FIG. 1 is a schematic flow chart diagram of a method of controlling a range extender in accordance with one embodiment of the present invention;

FIG. 2 is a schematic flow chart diagram of a method of controlling a range extender in accordance with another embodiment of the present invention;

fig. 3 is a schematic block diagram of a control system of a range extender according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

GPF is an aftertreatment component of an engine exhaust system that is installed after TWCs (Three Way Catalysts) to reduce the amount and quality of particulate matter in the exhaust by trapping particulate matter in the engine exhaust. As the amount of particulate matter accumulated increases, exhaust back pressure increases, fuel consumption increases, and engine performance decreases, so the GPF needs to timely combust the trapped particulate matter, i.e., perform GPF regeneration. The conditions for GPF regeneration were: the internal temperature of GPF is higher than 580 deg.C, and the oxygen concentration is greater than 0.5%, or the air excess coefficient in engine cylinder is greater than 1.022. The regeneration process can be expressed by the chemical equation: c + O₂＝CO₂。

From a GPF internal regeneration process perspective, temperature and oxygen content in the exhaust determine important factors for regeneration efficiency. Under the actual operation condition of the range extender, the exhaust temperature is generally high, so the oxygen content is a key factor influencing the regeneration quality, but the range extender is considered to be mainly operated under the condition that the excess air coefficient lambda is 1, and sufficient oxygen content cannot be provided for carbon oxidation and combustion, so the range extender is required to create conditions, and the oxygen content during GPF regeneration is increased, so that the GPF is regenerated.

Fig. 1 is a schematic flow chart of a control method of a range extender according to an embodiment of the present invention. As shown in fig. 1, in a specific embodiment, the control method of the range extender may include the steps of:

s100, acquiring working parameters of the gasoline engine particle trap;

s200, judging whether the gasoline engine particle trap reaches a regeneration condition according to the working parameters; if yes, executing S300;

and S300, starting a regeneration program, wherein the regeneration program comprises the steps of controlling the engine to cut off oil and controlling the generator to drive the engine to idle at a preset rotating speed, so that air entering the engine enters the gasoline engine particle trap through an exhaust system of the engine, and the oxygen content in the gasoline engine particle trap is improved.

Here, the preset rotation speed may be any value ranging from 3500rpm to 4000 rpm. In addition, the preset rotating speed can be set according to the specific requirements of the vehicle.

According to the invention, when GPF is regenerated, the generator is controlled to drag the engine to idle (at the moment, the fuel oil system does not inject fuel to participate in combustion, and oxygen entering the engine completely enters the exhaust system), so that surplus oxygen can be provided for combustion of particulate matters, and the GPF regeneration efficiency is improved.

Fig. 2 is a schematic flow chart of a control method of a range extender according to another embodiment of the present invention. In another embodiment, as shown in FIG. 2, when the gasoline engine particulate trap reaches the regeneration condition and before the step S300 of controlling to start the regeneration process, the control method further comprises:

s210, acquiring the running parameters of the vehicle;

s220, judging whether the vehicle is in a high-power demand state according to the running parameters of the vehicle, wherein the high-power demand state is that the power demand of the vehicle is higher than a preset power value; if yes, go to S230;

s230, the regeneration process is not started.

The invention can not start the regeneration program when the vehicle is in a high-power demand state, thereby ensuring the normal operation of the vehicle. When the vehicle is in a high power demand state, at which time the electric quantity of the power battery is consumed quickly, the engine drives the motor to charge the power battery, and therefore, the engine needs to be normally operated at this time and cannot be in an idle state, and therefore, a regeneration process cannot be started. Here, the preset power value of the vehicle may be set according to specific requirements.

Further, the working parameter comprises at least one of a particle value and a pressure value in the gasoline engine particle trap, and the working state of the gasoline engine particle trap can be known through the particle value and the pressure value.

In one embodiment, the step S200 of determining whether the gasoline engine particulate trap reaches the regeneration condition according to the operating parameters specifically includes:

judging whether the particle value in the gasoline engine particle catcher is larger than a first preset threshold value or not; if yes, the gasoline engine particle catcher is judged to reach the regeneration condition. Here, the first preset threshold may be set in accordance with the specific performance of the gasoline engine particulate trap, or according to the specific requirements of the vehicle.

Further, after the step S300 of starting the regeneration process, the control method further includes:

judging whether the particle value in the gasoline engine particle trap is smaller than a second preset threshold value, wherein the second preset threshold value is smaller than the first preset threshold value; if yes, controlling the engine to stop idling.

The invention can judge whether to start the regeneration program or close the regeneration program according to the particle value in the gasoline engine particle catcher, namely, the engine is controlled to idle or stop idle, thereby ensuring the full combustion of the particles.

In another embodiment, the step S200 of determining whether the gasoline engine particulate trap reaches the regeneration condition according to the operating parameter specifically includes:

judging whether the pressure value in the gasoline engine particle catcher is larger than a first preset pressure value or not; if yes, the gasoline engine particle catcher is judged to reach the regeneration condition. Here, the first preset pressure value may be set in accordance with the specific performance of the gasoline engine particulate trap, or according to the specific requirements of the vehicle.

Further, after the step S300 of starting the regeneration process, the control method further includes:

judging whether the pressure value in the gasoline engine particle catcher is smaller than a second preset pressure value or not, wherein the second preset pressure value is smaller than the first preset pressure value; if yes, controlling the engine to stop idling.

The invention can also judge whether to start the regeneration process or close the regeneration process according to the pressure value in the gasoline engine particle catcher, namely, the engine is controlled to idle or stop idle, thereby ensuring the full combustion of the particulate matters.

Fig. 3 is a schematic block diagram of a control system 100 of a range extender according to an embodiment of the present invention. As shown in fig. 3, in a specific embodiment, the control system 100 of the range extender includes an obtaining module 10 for obtaining the operating parameters of the particulate trap of the gasoline engine and a control module 20, the control module 20 includes a memory 21 and a processor 22, the memory 21 stores a computing program, and the computing program is used for implementing the control method in any one of the above embodiments when being executed by the processor 22. The processor 22 may be a Central Processing Unit (CPU), a digital processing unit, or the like. The processor 22 transceives data through the communication interface. The memory 21 is used for storing programs executed by the processor 22. The memory 21 is any medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, or a combination of multiple memories 21. The above-described computing program may be downloaded from a computer-readable storage medium to a corresponding computing/processing device or to a computer or external storage device via a network (e.g., the internet, a local area network, a wide area network, and/or a wireless network).

Further, the control system 100 of the range extender also includes an engine and a generator. The control module 20 includes an Engine Controller (ECU), a Generator Controller (GCU), and a Range Extender Controller (RECU). Wherein the Engine Controller (ECU) and the engine comprise an engine assembly; the generator and the Generator Controller (GCU) form a generator assembly. The Engine Controller (ECU) and the Range Extender Controller (RECU) realize communication through an internal CANBus (controller Area Network bus); the Generator Controller (GCU) and the Range Extender Controller (RECU) are also communicated through an internal CANbus. The direct connection of the engine and the generator can realize that the engine drives the generator to generate electricity, or the generator drags the engine to idle under a certain working condition, namely the generator has double functions of generating electricity and driving.

Specifically, an Engine Controller (ECU) judges whether GPF regeneration conditions are met or not through GPF regeneration conditions, if the GPF regeneration conditions are met, the Engine Controller (ECU) sends a regeneration request to a Range Extender Controller (RECU) through an internal CANBus, after the Range Extender Controller (RECU) receives a regeneration request signal sent by the Engine Controller (ECU), the Range Extender Controller (RECU) judges whether the regeneration moment affects the performance of the whole vehicle or not, under the condition that the performance of the whole vehicle is not affected, the Range Extender Controller (RECU) sends a rotating speed signal to a Generator Controller (GCU) and simultaneously sends an oil cut-off signal to the Engine Controller (ECU), at the moment, the Engine Controller (ECU) controls oil cut-off, the Generator Controller (GCU) controls the generator to rotate at a fixed rotating speed, no fuel oil is dragged in an engine cylinder to participate in combustion, and all air entering the engine enters the GPF to participate in combustion, sufficient air is provided for GPF regeneration, and the regeneration efficiency is improved. When the Engine Controller (ECU) detects that GPF regeneration needs to be quitted, the Engine Controller (ECU) sends a regeneration quitting request to the Range Extender Controller (RECU), the Range Extender Controller (RECU) sends a power request to the Engine Controller (ECU) after receiving the signal, and the whole range extender recovers normal operation.

In addition, the invention also provides a vehicle which is provided with the control system 100 of the range extender. The control system 100 is not described in detail herein.

The GPF regeneration process of the traditional fuel engine is that the oil is cut off at a certain rotating speed, the oil cut-off process is short, the oil is cut off from 4000r/min to the idle speed for about 3-4 seconds, the oxygen intake is small, the GPF regeneration process is short every time, and the regeneration efficiency is low. Aiming at the problem of low GPF regeneration efficiency in the prior art, the invention has the innovation that the control module 20 controls the generator to drag the engine to run when the GPF is regenerated (at the moment, the engine idles at a fixed rotating speed, a fuel system does not inject oil to participate in combustion, and oxygen entering the engine completely enters an exhaust system), and in addition, the idling time of the engine can be further controlled, so that the time of air entering the GPF can be accurately controlled, the oxygen amount is increased, the combustion time is increased, and the GPF regeneration efficiency is improved.

Under the condition of not influencing the performance of the whole vehicle, the invention can accurately control the towing time to increase the oxygen content required by GPF regeneration, thereby accurately controlling the combustion quantity of particulate matters and improving the regeneration efficiency. And under the condition of not changing the mechanical structure, the method is easy to realize on the extended range vehicle through the modification of the calibration strategy, and has strong practical applicability.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.