Engine particulate matter emission optimization device and method, vehicle and storage medium

Abstract

The invention provides an engine particulate matter emission optimizing device and method, a vehicle and a storage medium, and belongs to the technical field of vehicle energy conservation and emission reduction. The engine particulate matter emission optimizing device comprises an air storage tank, an electromagnetic valve, an engine, a particulate trap, a whole vehicle controller and an engine controller; the air supply end of the air storage tank is connected to an engine air inlet pipe through an electromagnetic valve. An engine exhaust pipe is connected to the particulate filter; the operation information of the engine air inlet pipe, the engine exhaust pipe and the particle trap is obtained in real time, the combustion efficiency is analyzed in combination with the preset algorithm, the electromagnetic valve is controlled to be switched on and off, high-pressure gas is added, the pressure and temperature of mixed gas in the engine are effectively increased, atomization and mixing of diesel oil are promoted, and the combustion efficiency is improved. When the compression stroke of the engine reaches the upper pole, diesel oil is combusted more fully, the corresponding carbon loading amount is reduced, the service life of the DPF is prolonged, meanwhile, the combustion efficiency is improved, and the fuel economy and the engine dynamic property are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle energy conservation and emission reduction, and in particular relates to an engine exhaust particulate matter emission optimization device, method, vehicle and storage medium. Background Art

[0002] With the requirements for energy saving and emission reduction of vehicles, reducing particulate matter emitted by vehicles has become a current technological breakthrough. During the engine combustion process, due to incomplete combustion and high-temperature cracking of fuel, a large amount of particulate matter will be generated, which will affect the environment.

[0003] At present, combustion efficiency directly affects the fuel economy and emission performance of the engine. Low combustion efficiency will lead to incomplete combustion of fuel, which will increase the emission of harmful substances such as particulate matter and CO. Due to the variable operating state of the engine, it is impossible to effectively obtain parameters such as the engine's intake pressure and NOX concentration, resulting in a lack of accuracy in the calculation of combustion efficiency, incomplete combustion, and reduced combustion efficiency, resulting in the emission of unburned hydrocarbons and particulate matter, affecting the power and economy of the engine. Summary of the invention

[0004] The present invention provides an engine exhaust particulate matter emission optimization device, and the method can reduce the number of regeneration times of a particulate filter (DPF), improve engine performance, and extend the service life of the DPF.

[0005] The device includes: an air tank, a solenoid valve, an engine, a particulate collector, a vehicle controller and an engine controller;

[0006] The air supply end of the air tank is connected to the engine intake pipe through a solenoid valve; the engine exhaust pipe is connected to the particulate filter;

[0007] The vehicle controller is connected to the engine through the engine controller, and the vehicle controller is connected to the solenoid valve, engine intake pipe, engine exhaust pipe and particulate filter respectively. The vehicle controller obtains the operating information of the engine intake pipe, engine exhaust pipe and particulate filter in real time, analyzes the combustion efficiency in combination with the preset algorithm, and controls the on and off of the solenoid valve.

[0008] It should be further explained that it also includes: intake pressure sensor, NO X Sensors and differential pressure sensors;

[0009] The vehicle controller is connected to the engine intake pipe through the intake pressure sensor to obtain the intake pressure information;

[0010] The vehicle controller passes NO XThe sensor is connected to the engine exhaust pipe to obtain the NO X concentration;

[0011] The vehicle controller is connected to the particulate filter through a pressure difference sensor to obtain the pressure difference information of the particulate filter.

[0012] It should be further explained that the vehicle controller calculates the combustion efficiency based on the following preset algorithm:

[0013]

[0014] Among them, P in is the intake pressure, P in,ref is the reference intake pressure, F is the injection amount, F ref is the reference injection amount, C NOx is the concentration of nitrogen oxides, C NOx,ref is the reference concentration of nitrogen oxides, k1, k2, k3 are empirical coefficients respectively.

[0015] The present application also provides a method for optimizing engine exhaust particulate matter emissions, the method comprising:

[0016] Real-time acquisition of engine intake pressure information and engine exhaust NO X Concentration and differential pressure information of the particle collector;

[0017] Analyze the combustion efficiency based on the preset algorithm and compare the combustion efficiency with the preset calibration value;

[0018] When the combustion efficiency is less than the preset calibration value, the engine's air supply is controlled to increase so that the air and diesel are mixed to promote diesel atomization and mixing, so that the combustion efficiency reaches or exceeds the preset calibration value.

[0019] It should be further explained that the combustion efficiency is calculated based on the following preset algorithm:

[0020]

[0021] Among them, P in is the intake pressure, P in,ref is the reference intake pressure, F is the injection amount, F ref is the reference injection amount, C NOx is the concentration of nitrogen oxides, C NOx,ref is the reference concentration of nitrogen oxides, k1, k2, k3 are empirical coefficients respectively.

[0022] It should be further explained that, in the method, the air supply of the engine is controlled by controlling the on-off of the solenoid valve between the air supply end of the air storage tank and the engine intake pipe.

[0023] It should be further explained that the method further includes: obtaining the intake pressure P in real time in , fuel injection amount F, nitrogen oxide concentration C NOx and engine speed Z;

[0024] Estimate the real-time combustion efficiency based on the following formula;

[0025] Real-time combustion efficiency η s =α1P in +α2F+α3C NOx +α4Z;

[0026] α1, α2, α3, and α4 are empirical coefficients;

[0027] Calculate the average value of the real-time combustion efficiency within a preset monitoring time period, and compare the average value of the combustion efficiency with a preset calibration value;

[0028] When the average value of the combustion efficiency is less than the preset calibration value, the engine air supply is controlled to increase during the next preset monitoring time period to mix the air and diesel to promote diesel atomization and mixing, so that the combustion efficiency reaches or exceeds the preset calibration value.

[0029] It should be further explained that α1, α2, α3, and α4 are respectively obtained by least square method and correspondingly combined with the intake pressure P in , fuel injection amount F, nitrogen oxide concentration C NOx And the minimum value is set by taking the sum of the squares of the differences between the real-time detection value of the engine speed Z and the preset threshold.

[0030] According to another embodiment of the present application, a vehicle is provided, comprising: an engine exhaust particulate matter emission optimization device.

[0031] According to another embodiment of the present application, a storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the engine exhaust particulate matter emission optimization method are implemented.

[0032] It can be seen from the above technical solutions that the present invention has the following advantages:

[0033] The engine exhaust particulate matter emission optimization device and method provided by the present application obtains the engine's intake pressure, NOX concentration and the pressure difference information of the particulate trap in real time, analyzes the combustion efficiency in combination with a preset algorithm, and adjusts the engine's air supply accordingly. When the combustion efficiency is lower than the preset calibration value, increasing the air supply can promote the atomization and mixing of the diesel, making the combustion more complete, thereby improving the combustion efficiency, reducing the emission of unburned hydrocarbons and particulate matter, and improving the engine's power and economy.

[0034] This application adjusts the air supply of the engine by precisely controlling the on and off of the solenoid valve. When the solenoid valve is controlled to be opened, the gas in the gas tank is sprayed to the engine air intake and mixed with the air and diesel entering the engine. The addition of high-pressure gas effectively increases the pressure and temperature of the mixed gas in the engine, promotes the atomization and mixing of the diesel, and makes the diesel burn more fully when the engine compression stroke reaches the upper limit. The fully burned diesel reduces the generation of particulate matter such as carbon soot, and the corresponding carbon load is reduced. The vehicle controller can appropriately reduce the number of regenerations, extend the service life of the DPF, improve the combustion efficiency, increase fuel economy and engine power, and reduce pollutant emissions in the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0036] Figure 1 Schematic diagram of the device for optimizing particulate matter emissions from engines;

[0037] Figure 2 A flow chart of the method for optimizing engine particulate matter emissions;

[0038] Figure 3 The present invention is a flow chart of an embodiment of a method for optimizing engine particulate matter emissions. DETAILED DESCRIPTION

[0039] The following will describe in detail the implementation of the engine exhaust particulate matter emission optimization device. For the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are provided to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application can also be implemented in other embodiments without these specific details.

[0040] In the specification of the engine exhaust particulate matter emission optimization device of this application, the term "including" is used to indicate the presence of the described features, integral bodies, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integral bodies, steps, operations, elements, components and / or their collections. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0041] It should be understood that the "one or more" mentioned in this application refers to one, two or more than two, and the "multiple" mentioned in this application refers to two or more. In the description of this application, unless otherwise specified, " / " means or, for example, A / B can mean A or B. The "and / or" in this article is just a way to describe the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0042] The phrases such as "one embodiment" or "some embodiments" described in the present application mean that the specific features, structures or characteristics described in the embodiment are included in one or more embodiments of the present application. Therefore, the phrases such as "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments" etc. that appear in different places in the present application do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] See also Figure 1 The figure is a schematic diagram of an engine exhaust particulate matter emission optimization device in a specific embodiment, the device includes: an air storage tank, a solenoid valve, an engine, a particulate collector, a vehicle controller and an engine controller.

[0045] The air supply end of the air tank is connected to the engine intake pipe through a solenoid valve; the engine exhaust pipe is connected to the particulate filter; the vehicle controller is connected to the engine through the engine controller, and the vehicle controller is connected to the solenoid valve, the engine intake pipe, the engine exhaust pipe and the particulate filter. The vehicle controller obtains the operating information of the engine intake pipe, the engine exhaust pipe and the particulate filter in real time.

[0046] In some specific embodiments, the vehicle controller is connected to the engine intake pipe through an intake pressure sensor to obtain intake pressure information; the vehicle controller uses NO X The sensor is connected to the engine exhaust pipe to obtain the NO X Concentration; the vehicle controller is connected to the particulate filter through a pressure difference sensor to obtain the pressure difference information of the particulate filter.

[0047] The vehicle controller of this embodiment obtains the intake pressure information and the exhaust NO X The concentration and the differential pressure information of the particulate filter are combined with the preset algorithm to analyze the combustion efficiency, compare the combustion efficiency with the preset calibration value, and control the on and off of the solenoid valve according to the comparison result. Then, when the vehicle controller determines that the combustion efficiency is low, that is, more original exhaust particulate matter may be generated, the vehicle controller issues a command to control the solenoid valve to open, and the gas in the gas tank is sprayed to the engine intake port to mix with the air and diesel entering the engine. The addition of high-pressure gas effectively increases the pressure and temperature of the mixed gas in the engine, promotes the atomization and mixing of diesel, and makes the diesel burn more fully when the engine compression stroke reaches the upper extreme. The fully burned diesel reduces the generation of particulate matter such as carbon soot, and the corresponding carbon load is reduced. The vehicle controller can appropriately reduce the number of regenerations, extend the service life of the DPF, improve the combustion efficiency, increase fuel economy and engine power, and reduce pollutant emissions in the exhaust gas.

[0048] The following is an embodiment of the engine exhaust particulate matter emission optimization method provided in the embodiments of the present disclosure. This method and the engine exhaust particulate matter emission optimization devices of the above-mentioned embodiments belong to the same inventive concept. For details not fully described in the embodiment of the engine exhaust particulate matter emission optimization method, reference can be made to the embodiments of the above-mentioned engine exhaust particulate matter emission optimization device.

[0049] like Figure 2 As shown, the method includes:

[0050] S101: Real-time acquisition of engine intake pressure information and engine exhaust NO X concentration and differential pressure information across the particle trap.

[0051] In some embodiments, the vehicle controller can be connected to the engine intake pipe through the intake pressure sensor to obtain the intake pressure information; X The sensor is connected to the engine exhaust pipe to obtain the NO X concentration; connect the particulate collector through the differential pressure sensor to obtain the differential pressure information of the particulate collector.

[0052] S102: Analyze the combustion efficiency based on a preset algorithm, and compare the combustion efficiency with a preset calibration value.

[0053] In some embodiments, the user can set the preset calibration value for each vehicle. The setting method of the preset calibration value can be combined with the environment, purpose and emission requirements of the vehicle, so that the preset calibration value can meet the vehicle's usage requirements.

[0054] S103: When the combustion efficiency is less than a preset calibration value, the air supply of the engine is controlled to increase so that the air and diesel are mixed to promote diesel atomization and mixing, so that the combustion efficiency reaches or exceeds the preset calibration value.

[0055] In an embodiment of the present invention, based on step S102, a possible embodiment is given below to illustrate its specific implementation scheme in a non-limiting manner.

[0056] In some embodiments, the air storage tank is disposed outside the engine and connected to the air intake of the engine through a pipeline, and high-pressure air is stored in the air storage tank.

[0057] The solenoid valve is installed on the pipeline between the gas tank and the engine air intake to control the on / off and injection amount of gas injection.

[0058] In this embodiment, the intake pressure, fuel injection amount and nitrogen oxides (hereinafter referred to as NO X ) concentration and other information to preset the combustion efficiency estimation algorithm.

[0059] Specifically, the combustion efficiency estimation algorithm is based on NO X The coefficient is determined by combining the ratio of the reference value of each parameter with the parameters such as concentration and injection amount, and then calibrating the influencing factors through experiments. The preset algorithm can indirectly predict the combustion efficiency and particulate matter concentration through parameters such as intake pressure, injection amount and nitrogen oxide concentration.

[0060] For example, the vehicle controller calculates the combustion efficiency based on the following preset algorithm:

[0061]

[0062] Among them, P in is the intake pressure, P in,ref is the reference intake pressure, F is the injection amount, F ref is the reference injection amount, C NOx is the concentration of nitrogen oxides, C NOx,ref is the reference concentration of nitrogen oxides, k1, k2, k3 are empirical coefficients respectively.

[0063] In some embodiments, by adjusting the intake pressure P in With reference intake pressure P in,ref The ratio of is used to estimate the effect of intake pressure on combustion efficiency.

[0064] When the intake pressure is lower or higher than the reference value, it means that the air and diesel entering the engine cannot achieve the best combustion efficiency. in / P in,ref |) to indicate.

[0065] By comparing the injection amount F with the reference injection amount F ref The inverse of the ratio is used to estimate the effect of fuel injection amount on combustion efficiency.

[0066] By changing the nitrogen oxide concentration C NOx With reference concentration C NOx,ref The ratio of is used to estimate the effect of nitrogen oxide concentration on combustion efficiency.

[0067] High NOx concentration means that higher temperature and pressure are generated during combustion, which cannot achieve the best combustion efficiency. NOx,ref / C NOx ). The empirical coefficients k1, k2, and k3 in the formula can be calibrated by experimental data. These coefficients reflect the importance and weight of the influence of different parameters on combustion efficiency.

[0068] In this embodiment, when the engine is running, the vehicle controller monitors the intake pressure, fuel injection amount, exhaust pipe NO in real time through sensors. x Here, the combustion efficiency and original exhaust particulate matter concentration can be calculated according to the preset algorithm to control the switch of the solenoid valve.

[0069] When the vehicle controller determines that the combustion efficiency is low, that is, more original exhaust particulate matter may be generated, the vehicle controller issues a command to control the solenoid valve to open, and the gas in the gas tank is sprayed to the engine intake port to mix with the air and diesel entering the engine. The addition of high-pressure gas effectively increases the pressure and temperature of the mixed gas in the engine, promotes the atomization and mixing of the diesel, and makes the diesel burn more fully when the engine compression stroke reaches the upper limit. The fully burned diesel reduces the generation of particulate matter such as soot, and the corresponding carbon load is reduced. The vehicle controller can appropriately reduce the number of regenerations, extend the service life of the DPF, improve the combustion efficiency, increase fuel economy and engine power, and reduce pollutant emissions in the exhaust gas.

[0070] Further, as a refinement and expansion of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, as shown below Figure 3 As shown, the engine exhaust particulate matter emission optimization method of the present application also includes:

[0071] S201: Real-time acquisition of intake pressure P in , fuel injection amount F, nitrogen oxide concentration C NOx and engine speed Z;

[0072] S202: estimating the real-time combustion efficiency based on the following formula;

[0073] Real-time combustion efficiency η s =α1P in +α2F+α3C NOx+α4Z;

[0074] α1, α2, α3, and α4 are empirical coefficients;

[0075] S203: Calculating the average combustion efficiency of the real-time combustion efficiency within a preset monitoring time period, and comparing the average combustion efficiency with a preset calibration value;

[0076] S204: When the average value of the combustion efficiency is less than the preset calibration value, the air supply of the engine is controlled to increase during the next preset monitoring time period, so that the air and diesel are mixed to promote diesel atomization and mixing, so that the combustion efficiency reaches or exceeds the preset calibration value.

[0077] In some embodiments, α1, α2, α3, and α4 are respectively obtained by least square method and correspondingly combined with the intake pressure P in , fuel injection amount F, nitrogen oxide concentration C NOx And the minimum value is set by taking the sum of the squares of the differences between the real-time detection value of the engine speed Z and the preset threshold.

[0078] In an exemplary embodiment, data is collected in real time by an intake pressure sensor, a fuel injection amount sensor, a NOx concentration sensor, a DPF pressure difference sensor, etc. installed on the engine and the exhaust system.

[0079] The data that can be used in this embodiment include, but are not limited to, key parameters such as the engine's intake pressure, fuel injection volume, nitrogen oxide concentration, and engine speed, etc. These parameters are monitored in real time through corresponding sensors and control systems and transmitted to the vehicle controller.

[0080] Optionally, the collected data is subjected to preprocessing operations such as filtering and denoising to improve the accuracy and reliability of the data.

[0081] In some embodiments, the real-time combustion efficiency is estimated based on the following formula.

[0082] Real-time combustion efficiency η s =α1P in +α2F+α3C NOx +α4Z;. Here, α1, α2, α3, and α4 are empirical coefficients and need to be calibrated according to actual conditions.

[0083] During the preset monitoring period, the average value of the real-time combustion efficiency is calculated. This average value represents the overall level of the engine combustion efficiency during the period. The calculated average value of the combustion efficiency is compared with the preset calibration value. The calibration value is set based on a comprehensive consideration of factors such as emission standards, engine performance requirements, and economy.

[0084] If the average value of the combustion efficiency is less than the preset calibration value, it means that the current combustion efficiency is insufficient, and it is necessary to control and increase the air supply to the engine within the next preset monitoring period. Increasing the air supply can promote the mixing of air and diesel, improve the atomization and mixing effect of diesel, and thus improve the combustion efficiency.

[0085] In some embodiments, the empirical coefficients α1, α2, α3, and α4 can be calibrated by the least square method. Specifically, the values ​​of these coefficients are determined by taking the minimum value of the sum of the squares of the differences between the real-time detection values ​​of the intake pressure, the injection amount, the nitrogen oxide concentration, and the engine speed and the preset thresholds. This method can ensure that the estimated combustion efficiency is more accurate.

[0086] In the method involved in this embodiment, by optimizing the combustion efficiency, particulate matter generated by incomplete combustion and high-temperature cracking of fuel can be reduced, thereby reducing particulate matter emissions from the engine. Optimizing the combustion efficiency means that more fuel can be effectively utilized, thereby improving fuel economy.

[0087] This embodiment can optimize the operating state of the engine, improve the power performance and response speed by accurately controlling the air supply and other parameters of the engine. Real-time monitoring and dynamic adjustment of the operating parameters of the engine can ensure that the engine can maintain a stable working state under different working conditions.

[0088] This embodiment also provides a vehicle, the vehicle includes: an engine exhaust particulate matter emission optimization device. Of course, according to actual needs, the vehicle can be a heavy truck, a light truck, etc. By connecting a gas tank controlled by a solenoid valve to the vehicle engine air intake, and presetting a combustion efficiency estimation algorithm, when the concentration of the original exhaust particulate matter caused by the reduction of the intake pressure due to gear shifting and other processes is close to the upper limit of the National VI emission regulations, the solenoid valve controls the gas tank to spray, so that the diesel in the engine burns more fully, thereby effectively optimizing the original exhaust particulate matter, improving the combustion efficiency, and reducing pollutant emissions.

[0089] This embodiment also reduces the number of times the particle trap in the vehicle is regenerated, improves engine performance, and prolongs the service life of the DPF. The device has a simple structure and strong practicality, and is particularly suitable for engines that meet the National VI emission standards, and has a significant environmental protection effect.

[0090] The vehicle with an engine exhaust particulate matter emission optimization device provided in this embodiment is a combination of the units and algorithm steps of each example described in the embodiment disclosed herein, which can be implemented by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0091] In the storage medium provided in the present application, a program product capable of implementing the above method of the present specification is stored. In some possible implementations, various aspects of the present disclosure may also be implemented in the form of a program product, which includes a program code, and when the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps according to various exemplary implementations of the present disclosure described in the above "Exemplary Method" section of the present specification.

[0092] The storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0093] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An engine exhaust particulate matter emission optimization device, characterized in that: include: Gas tank, solenoid valve, engine, particulate filter, vehicle controller and engine controller; The air supply end of the air tank is connected to the engine intake pipe through a solenoid valve; the engine exhaust pipe is connected to the particulate filter; The vehicle controller is connected to the engine through the engine controller, and the vehicle controller is connected to the solenoid valve, engine intake pipe, engine exhaust pipe and particulate collector respectively. The vehicle controller obtains the operating information of the engine intake pipe, engine exhaust pipe and particulate collector in real time, and then analyzes the combustion efficiency in combination with the preset algorithm, compares the combustion efficiency with the preset calibration value, and controls the on and off of the solenoid valve according to the comparison result.

2. The engine exhaust particulate matter emission optimization device according to claim 1, characterized in that: Also includes: intake pressure sensor, NO X Sensors and differential pressure sensors; The vehicle controller is connected to the engine intake pipe through the intake pressure sensor to obtain the intake pressure information; The vehicle controller passes NO X The sensor is connected to the engine exhaust pipe to obtain the NO X concentration; The vehicle controller is connected to the particulate filter through a pressure difference sensor to obtain the pressure difference information of the particulate filter.

3. The engine exhaust particulate matter emission optimization device according to claim 2, characterized in that: The vehicle controller calculates the combustion efficiency based on the following preset algorithm: Among them, P in is the intake pressure, P in,ref is the reference intake pressure, F is the injection amount, F ref is the reference injection amount, C NOx is the concentration of nitrogen oxides, C NOx,ref is the reference concentration of nitrogen oxides, k1, k2, k3 are empirical coefficients respectively.

4. A method for optimizing engine exhaust particulate matter emissions, characterized in that: The method is implemented based on the engine exhaust particulate matter emission optimization device according to any one of claims 1 to 3; Methods include: Real-time acquisition of engine intake pressure information and engine exhaust NO X Concentration and differential pressure information of the particle collector; Analyze the combustion efficiency based on the preset algorithm and compare the combustion efficiency with the preset calibration value; When the combustion efficiency is less than the preset calibration value, the engine's air supply is controlled to increase so that the air and diesel are mixed to promote diesel atomization and mixing, so that the combustion efficiency reaches or exceeds the preset calibration value.

5. The engine exhaust particulate matter emission optimization method according to claim 4, characterized in that: The combustion efficiency is calculated based on the following preset algorithm: Among them, P in is the intake pressure, P in,ref is the reference intake pressure, F is the injection amount, F ref is the reference injection amount, C NOx is the concentration of nitrogen oxides, C NOx,ref is the reference concentration of nitrogen oxides, k1, k2, k3 are empirical coefficients respectively.

6. The engine exhaust particulate matter emission optimization method according to claim 4, characterized in that: In the method, the air supply volume of the engine is controlled by controlling the on-off of the electromagnetic valve between the air supply end of the air storage tank and the air intake pipe of the engine.

7. The engine exhaust particulate matter emission optimization method according to claim 4, characterized in that: The method also includes: obtaining the intake pressure P in real time in , fuel injection amount F, nitrogen oxide concentration C NOx and engine speed Z; Estimate the real-time combustion efficiency based on the following formula; Real-time combustion efficiency η s =α1P in +α2F+α3C NOx +α4Z; α1, α2, α3, and α4 are empirical coefficients; Calculate the average value of the real-time combustion efficiency within a preset monitoring time period, and compare the average value of the combustion efficiency with a preset calibration value; When the average value of the combustion efficiency is less than the preset calibration value, the engine air supply is controlled to increase during the next preset monitoring time period to mix the air and diesel to promote diesel atomization and mixing, so that the combustion efficiency reaches or exceeds the preset calibration value.

8. The engine exhaust particulate matter emission optimization method according to claim 7, characterized in that: α1, α2, α3, and α4 are respectively obtained by least square method and correspondingly combined with the intake pressure P in , fuel injection amount F, nitrogen oxide concentration C NOx And the minimum value is set by taking the sum of the squares of the differences between the real-time detection value of the engine speed Z and the preset threshold.

9. A vehicle, characterized in that: include: The engine exhaust particulate matter emission optimization device according to any one of claims 1 to 3.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the engine exhaust particulate matter emission optimization method according to any one of claims 4 to 8 are implemented.

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