阅读说明：本技术 一种降低汽油机颗粒物排放的增压直喷控制方法及装置 (Supercharging direct injection control method and device for reducing particulate matter emission of gasoline engine ) 是由 彭浩 陈苏佑 李仕成 胡必柱 康天红 于 2020-12-18 设计创作，主要内容包括：本发明公开了一种降低汽油机颗粒物排放的增压直喷控制方法,包括：实时获取发动机工况参数；设定发动机工况参数阈值；当所述发动机工况参数高于所述发动机工况参数阈值时；在时间阈值范围内,修正发动机的燃油参数。本发明还公开了一种电子设备,通过对汽车电子控制单元控制逻辑的优化,降低发动机的颗粒物排放,在不增加颗粒物捕集器的情况下能满足法规要求,有效降低整车开发成本。(The invention discloses a supercharged direct injection control method for reducing particulate matter emission of a gasoline engine, which comprises the following steps of: acquiring working condition parameters of an engine in real time; setting an engine working condition parameter threshold; when the engine operating condition parameter is higher than the engine operating condition parameter threshold; and within the time threshold range, modifying the fuel parameter of the engine. The invention also discloses electronic equipment, which can reduce the particulate matter emission of an engine by optimizing the control logic of the automobile electronic control unit, meet the regulation requirement under the condition of not increasing the particulate matter catcher and effectively reduce the development cost of the whole automobile.)

1. A supercharged direct injection control method for reducing particulate matter emission of a gasoline engine is characterized by comprising the following steps:

acquiring working condition parameters of an engine in real time;

setting an engine working condition parameter threshold;

when the engine operating condition parameter is higher than the engine operating condition parameter threshold;

and within the time threshold range, modifying the fuel parameter of the engine.

2. The method of claim 1 wherein said engine operating parameters include: the engine water temperature, the engine load change rate, the engine speed change rate and the accelerator pedal opening change rate;

the engine operating condition parameter threshold value comprises: an engine water temperature threshold, an engine load change rate threshold, a rotation speed change rate threshold and an accelerator pedal opening change rate threshold.

3. The method of claim 2 wherein said fuel injection parameters include injection pressure, injection angle, and fuel offset factor.

4. The method of claim 3 wherein said engine water temperature threshold is between 26 ℃ and 30 ℃.

5. The method of claim 4 wherein said engine load rate threshold and said speed rate threshold are both calibrated for engine operating cycles.

6. The method of claim 5, wherein said accelerator pedal opening rate threshold is obtained by time calibration.

7. The method of claim 6, wherein said engine fuel injection parameter modification process comprises the steps of:

adjusting the fuel injection pressure of the engine to the maximum fuel injection pressure;

giving the oil injection times of the engine and correcting an oil injection angle;

and reducing the fuel compensation coefficient under the transient working condition.

8. The method of claim 7 wherein said correction of said injection angle comprises the steps of:

establishing a corresponding relation between the oil injection angle and the engine rotating speed and the oil injection quantity;

obtaining the engine speed and the fuel injection quantity;

determining the number of times of fuel injection of the engine to be three, including: a first injection, a second injection and a third injection;

correction angles of the first injection, the second injection, and the third injection are determined respectively to increase a start angle of injection of the first injection, decrease a start angle of injection of the second injection, and decrease an end angle of injection of the third injection.

9. The method of boosted direct injection control for reducing particulate emissions from gasoline engines of claim 8 wherein said decreasing said fuel offset factor is decreasing said fuel offset factor by 40% to 60%.

10. An electronic device comprising an application processor and a memory, wherein the processor is configured to implement the steps of the method of reducing particulate emissions from a gasoline engine as recited in any of claims 1-9 when implemented in a computer management program stored in the memory.

Technical Field

The invention relates to the field of vehicle control, in particular to a supercharged direct injection control method and a supercharged direct injection control device for reducing particulate matter emission of a gasoline engine.

Background

The six state emission regulations increase the emission of the particulate matters of the gasoline engine, and how to effectively reduce the emission of the particulate matters becomes the key point of overcoming of a host machine factory. Most of the host plants on the market at present deal with the emission of the newly added gasoline engine particles in the national six regulations by adding the particle catcher. Because of the inherent characteristics of the structure of the GPF, the GPF can complement 90% of particulate matters, and can effectively reduce the particulate matter emission.

But increasing the particulate matter trap and can bring whole car cost to increase to need to optimize exhaust system's arrangement again, after the particulate matter that particulate matter trap mended the collection reaches a certain quantity, need carry out particulate matter regeneration control, because the reason of cold district's environment, there is low temperature particulate matter regeneration difficulty, leads to a series of problems such as trap jam.

Disclosure of Invention

The invention monitors the operating condition parameters of the engine in real time to determine the area which is easy to emit particulate matters in the transient operating condition of the whole vehicle emission cycle, and further controls the fuel injection parameters to realize the reduction of the particulate matters.

The technical scheme of the invention is as follows:

a supercharged direct injection control method for reducing particulate matter emission of a gasoline engine comprises the following steps:

acquiring working condition parameters of an engine in real time;

setting an engine working condition parameter threshold;

when the engine operating condition parameter is higher than the engine operating condition parameter threshold;

and within the time threshold range, modifying the fuel parameter of the engine.

Preferably, the engine operating condition parameters include: the engine water temperature, the engine load change rate, the engine speed change rate and the accelerator pedal opening change rate;

the engine operating condition parameter threshold value comprises: an engine water temperature threshold, an engine load change rate threshold, a rotation speed change rate threshold and an accelerator pedal opening change rate threshold.

Preferably, the fuel injection parameters include injection pressure, injection angle, and fuel compensation factor.

Preferably, the threshold value of the water temperature of the engine is 26-30 ℃.

Preferably, the threshold values of the load change rate and the speed change rate of the engine are obtained by calibrating the number of the operation cycles of the engine.

Preferably, the accelerator pedal opening rate threshold is obtained by time calibration.

Preferably, the process for correcting the fuel injection parameter of the engine specifically includes the following steps:

adjusting the fuel injection pressure of the engine to the maximum fuel injection pressure;

giving the oil injection times of the engine and correcting an oil injection angle;

and reducing the fuel compensation coefficient under the transient working condition.

Preferably, the correction of the injection angle includes the steps of:

establishing a corresponding relation between the oil injection angle and the engine rotating speed and the oil injection quantity;

obtaining the engine speed and the fuel injection quantity;

determining the number of times of fuel injection of the engine to be three, including: a first injection, a second injection and a third injection;

correction angles of the first injection, the second injection, and the third injection are determined respectively to increase a start angle of injection of the first injection, decrease a start angle of injection of the second injection, and decrease an end angle of injection of the third injection.

Preferably, the fuel compensation factor is reduced by 40-60%.

An electronic device comprising an application processor and a memory, said processor being adapted to implement the steps of a method of boosted direct injection control for reducing particulate matter emissions from gasoline engines when implemented in a computer management program stored in said memory.

The invention has the beneficial effects that:

the invention establishes the relation between the number of engine operating cycles and the change rate of the rotating speed, the relation between the number of engine operating cycles and the change rate of the load, and the relation between the time and the change rate of the accelerator pedal, sets the parameter threshold of the engine operating conditions according to different operating conditions, further judges the area with high particulate matter emission, triggers the ECU control system to correct the fuel parameters of the engine, and realizes the particulate matter emission.

The invention establishes the corresponding relation between the oil injection angle and the actual rotating speed and the oil injection quantity of the engine, dynamically adjusts the oil injection angle according to the actual rotating speed and the oil injection quantity of the engine, avoids the phenomenon that fuel oil wets the wall, enhances the atomization of the fuel oil, and further reduces the particulate matter emission of the gasoline engine.

According to the invention, the particulate matter emission of the engine is reduced by optimizing the control logic of the ECU, the national six-regulation requirement can be met under the condition that the particulate matter catcher is not added, the development cost of the whole vehicle is effectively reduced, and the development problem caused by the addition of the particulate matter catcher is avoided.

Drawings

FIG. 1 is a flow chart of a supercharged direct injection control method for reducing particulate matter emission of a gasoline engine provided by the invention.

FIG. 2 is a flow chart of a boosted direct injection control method for reducing particulate matter emissions from gasoline engines according to one embodiment of the present invention.

FIG. 3 is an engine operating condition identification map in accordance with an embodiment of the present invention.

FIG. 4 is a schematic diagram of an ECU system control strategy in accordance with an embodiment of the present invention.

Fig. 5 is a configuration diagram of an electronic device provided by the present invention.

Fig. 6 is a configuration diagram of a vehicle ECU controller provided by the present invention.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that in the description of the present invention, the terms "in", "upper", "lower", "lateral", "inner", etc. indicate directions or positional relationships based on those shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in FIG. 1, the present invention provides a method for controlling direct injection with increased pressure to reduce particulate matter emissions from gasoline engines, which comprises the following steps:

and S110, acquiring the working condition parameters of the engine in real time.

Specifically, the supercharged direct injection control method for reducing the particulate matter emission of the gasoline engine is integrated in ECU control, the supercharged direct injection control method for controlling the particulate matter emission of the low gasoline engine is started after the engine is started, the working condition is identified according to the region of the national six-emission cycle transient working condition emitting the particulate matter, and the working condition parameters in the engine running cycle are monitored in real time, wherein the specific engine working condition parameters comprise the engine water temperature, the rotating speed change rate, the torque change rate, the accelerator pedal change rate and the like.

And step S120, setting an engine working condition parameter threshold value.

Wherein, the threshold value of the starting condition parameter comprises: an engine water temperature threshold, an engine load change rate threshold, a rotation speed change rate threshold and an accelerator pedal opening change rate threshold.

And S130, when the engine working condition parameter is higher than the engine working condition parameter threshold value.

And comparing the engine working condition parameter with the engine working condition parameter threshold, and judging that the engine running working condition reaches a particle height area when the engine working condition parameter is greater than the engine working condition parameter threshold. I.e., when all engine operating condition parameters are greater than the engine operating condition parameter threshold, the process proceeds to step S140.

And step S140, correcting the fuel parameter of the engine within the time threshold range.

Specifically, the fuel parameters of the engine are corrected within a time threshold range t, wherein the fuel injection parameters comprise fuel injection pressure, fuel injection angle and fuel compensation coefficient, and the supercharged direct injection control method for controlling the particulate matter emission of the low gasoline engine is finished when the time threshold range t is exceeded.

The invention monitors the operating condition parameters of the engine in real time to determine the area which is easy to emit particulate matters in the transient operating condition of the whole vehicle emission cycle, and further controls the fuel injection parameters to realize the reduction of the particulate matters.

In another embodiment, the process of setting the engine operating condition parameter threshold in step S120 is:

the setting of the engine water temperature threshold is obtained through experimental detection or estimation, in the embodiment, after the operation of the engine is detected through experiments, the ECU can identify the working condition that the particulate matters are high, correspondingly detect the engine water temperature in the region where the particulate matters are emitted under the first transient working condition of the national six-emission cycle, obtain the range of the engine water temperature threshold as 26-30 ℃, and further enable the engine water temperature threshold to be any temperature value within the range of 26-30 ℃.

The threshold value of the engine load change rate is obtained by experimental detection or simulation calculation, and in the embodiment, the threshold value is obtained by monitoring the load change rate of the engine operation in real time: the method comprises the steps of monitoring the operation condition of the engine, establishing the relation between the number of engine operation cycles and the engine load change rate to obtain a detection table, and calibrating the threshold value of the engine load change rate through the table.

The threshold of the speed change rate is obtained by experimental detection or simulation calculation, and in this embodiment, the speed change rate is obtained by monitoring the speed change rate of the engine operation in real time: the method comprises the steps of monitoring the operation condition of the engine, establishing the relation between the number of engine operation cycles and the change rate of the rotating speed to obtain a detection table, and calibrating the threshold value of the change rate of the rotating speed by the table lookup.

The accelerator pedal change rate is obtained by experimental detection or simulation calculation, and in the embodiment, the accelerator pedal change rate is obtained by monitoring the running of the engine in real time: the method comprises the steps of monitoring the operation condition of an engine, establishing the relation between the number of engine operation cycles and the change rate of an accelerator pedal to obtain a detection table, and calibrating the threshold value of the change rate of the accelerator pedal through the table.

In the embodiment, the operating condition of the engine is monitored in real time, the working condition parameter threshold of the engine is calibrated, the particulate matter emission state of the engine can be pre-judged according to the calibrated threshold, a trap is not required to be added, the working condition of the engine is calibrated and detected in real time, and the identified high particulate matter emission area of the engine is obtained.

In another embodiment, step S140 modifies the fuel injection parameter by:

and (3) correcting the initial injection angle (SOI1 and SOI2) of the first injection, the second injection and the end injection angle (EOI) of the third injection by using the three injections, correcting the transient fuel quantity and maintaining the control parameters of the t time unchanged. The generation of particulate matters generally occurs in the stage of sharp increase of the engine cold machine torque, namely the so-called transient working condition, and the problem of high particulate matter emission can be solved to a great extent by correcting the fuel injection parameters.

In another embodiment, the specific process for reducing particulate emissions from gasoline engines is:

the supercharged direct injection control method for reducing the particulate matter emission of the gasoline engine is integrated in ECU control, the ECU identifies whether the national six-emission cycle reaches a particulate matter high region or not according to the operation condition of the engine after the engine is started, and a particulate matter control program is entered when the particulate matter high region occurs.

As shown in FIG. 2, after the engine is running, the ECU will recognize the high particulate matter condition: the specific control parameters comprise an engine water temperature T, an engine load change rate M1, an engine speed change rate N1 and an accelerator pedal opening change rate L1, the control parameters are compared with set threshold values in a certain engine running cycle, any condition is not met, the engine maintains the original control logic, and if and only if all the conditions are met, the engine enters a particulate matter control program.

As can be seen from fig. 3, in the region a1 where particulate matter is emitted in the first transient operating condition of the six emission cycles in China, the engine water temperature T is 28 ℃, in the embodiment, the engine water temperature threshold T1 is 28 ℃, and when the water temperature T > T1, the water temperature satisfies the particulate matter entering control program.

When the load condition is satisfied when the engine load change rate M1 is higher than the threshold value M, which is obtained through the actual emission calibration process, the relationship between the threshold value M and the number of engine operating cycles is shown in table 1.

TABLE 1 relationship of number of engine operating cycles to rate of change of engine load

Number of engine operating cycles	5	6	7	8	9	10
							Load change rate M (mg/l)	200	400	600	700	800	1000

When the engine speed change rate N1 is higher than the threshold N, the speed condition is satisfied and the particulate matter control program is entered, and the relationship between the threshold N and the number of engine operating cycles is shown in table 2, which is obtained during the actual emission calibration process.

TABLE 2 relationship table of number of engine operating cycles and rate of change of rotation speed

Number of engine operating cycles	5	6	7	8	9	10
							Rate of change of rotation N (n)	500	700	1000	1400	1800	2000

When the accelerator pedal change rate L1 is higher than the limit value L, the accelerator condition is satisfied and the particulate matter control program is entered, and the relationship between the threshold value L and the time is obtained in the actual emission calibration process, as shown in Table 3.

TABLE 3 Accelerator pedal opening degree change rate versus time table

After entering the particulate matter control program, the corresponding execution actions are as follows: in the control time t, in order to strengthen the atomization of the fuel oil, the fuel injection pressure is increased to the maximum fuel injection pressure;

the number of times of injection of the engine is determined to be three, and in order to avoid the phenomenon of fuel wetting, the starting angle of the second injection is reduced and the cut-off angle of the third injection is reduced by increasing the starting angle of the first injection, and the specific process is shown in FIG. 4. The angle of compensation is determined for the rotational speed and the fuel injection amount, respectively, as shown in table 4.

And a three-time injection mode is adopted, so that the emission of particles can be reduced, the excellent dynamic property can be ensured, and the combustion is more complete and economic.

TABLE 4 correction table for oil injection angle

The fuel compensation coefficient under the transient working condition is reduced, and the concrete expression is that the fuel compensation coefficient is reduced by 40-60%, in the embodiment, the fuel compensation coefficient is reduced by 50%, the excessive high concentration of the mixed gas is avoided, and the fuel injection quantity is controlled more accurately.

For stable combustion, the time t is kept unchanged by each parameter of the particulate matter control process. The relationship between the control time t and the engine speed is shown in table 5.

TABLE 5 Engine revolutions vs. control time table

Number of revolutions of engine	1000	2000	3000	4000	5000	5500
							Control time t	1.56	1.56	1.57	1.58	1.59	1.59

When the time t is exceeded after the particulate matter control program is entered, the particulate matter control program is exited, the engine control is executed according to the original scheme, the ECU control effect is as shown in figure 3, the combustion condition of the engine is stable, and the particulate matter emission is effectively reduced.

In another embodiment, as shown in fig. 5, the present invention further provides an electronic device, which comprises a memory 210, a processor 220 and a computer program 211 stored in the memory 210 and operable on the processor 220, wherein the processor 220 implements the following steps of the supercharged direct injection control method for reducing particulate matter emissions of gasoline engines when the computer program 211 is executed by the processor 220.

Acquiring working condition parameters of an engine in real time;

setting an engine working condition parameter threshold;

when the engine operating condition parameter is higher than the engine operating condition parameter threshold;

and within the time threshold range, modifying the fuel parameter of the engine.

In a specific implementation, when the processor 220 executes the computer program 211, any of the embodiments corresponding to fig. 1 may be implemented.

Since the electronic device described in this embodiment is a device for implementing the supercharged direct injection control method for reducing particulate matter emission of the gasoline engine in this embodiment, based on the method described in this embodiment, those skilled in the art can understand the specific implementation manner of the electronic device of this embodiment and various modifications thereof, so that how to implement the method in this embodiment is not described in detail herein, and as long as those skilled in the art implement the device used in this embodiment, they all belong to the protection scope of this application.

Preferably, the computer program 211 provided by the present invention is stored in a vehicle ECU controller.

As shown in fig. 6, the present embodiment provides a vehicle ECU controller having stored thereon a computer program 211, the computer program 211 realizing the steps of, when executed by a processor:

acquiring working condition parameters of an engine in real time;

setting an engine working condition parameter threshold;

when the engine operating condition parameter is higher than the engine operating condition parameter threshold;

and within the time threshold range, modifying the fuel parameter of the engine.

In particular implementation, the computer program 211, when executed by the vehicle ECU controller, may implement any of the embodiments corresponding to fig. 1-2.

It should be noted that, in the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to relevant descriptions of other embodiments for parts that are not described in detail in a certain embodiment.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

This patent is optimized ECU control logic, controls the fuel injection mode of engine through the control procedure to reduce the particulate matter emission of gasoline engine, need not to increase the particulate matter trap, satisfy six legal and legal requirements in state, with low costs, control effect is good, and the method science has effectively solved the key technical problem that the particulate matter discharged and has been because of the development difficult problem that increases the particulate matter trap and bring.

The above descriptions are only examples of the present invention, and common general knowledge of known specific structures, characteristics, and the like in the schemes is not described herein too much, and it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Without departing from the invention, several changes and modifications can be made, which should also be regarded as the protection scope of the invention, and these will not affect the effect of the invention and the practicality of the patent.