CN120867895B

CN120867895B - Reference value determining method and related device of EGR valve front pressure sensor

Info

Publication number: CN120867895B
Application number: CN202511353760.5A
Authority: CN
Inventors: 张红倩; 殷治梅; 张晨; 王建东; 赵曦
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2025-09-22
Filing date: 2025-09-22
Publication date: 2025-12-26
Anticipated expiration: 2045-09-22
Also published as: CN120867895A

Abstract

This application provides a method and related apparatus for determining the reference value of an EGR valve inlet pressure sensor. It includes: acquiring temperature data when the vehicle is powered on; determining the EGR valve inlet pressure values for cold and hot states based on the temperature data to obtain a first and a second EGR valve inlet pressure value; acquiring a second engine coolant temperature when the vehicle is powered off; controlling the EGR valve to open for a first preset time period and then close based on the second engine coolant temperature; determining a third EGR valve inlet pressure value after the EGR valve closes; and determining the reference value of the EGR valve inlet pressure sensor based on the first, second, and third EGR valve inlet pressure values. This solves the problem of inaccurate pressure values detected by existing EGR valve inlet pressure sensors, which affects EGR valve control and leads to excessive engine emissions and performance degradation.

Description

Reference value determining method and related device of EGR valve front pressure sensor

Technical Field

The application relates to the technical field of reference value determination of an EGR valve front pressure sensor, in particular to a reference value determination method and device of an EGR valve front pressure sensor, a computer readable storage medium and electronic equipment.

Background

In a gas engine, an EGR (exhaust gas recirculation) system monitors line pressure in real time by an EGR valve front pressure sensor and calculates EGR flow based thereon to optimize combustion control. However, due to the existence of the check valve in the EGR line and the normally fully closed state of the EGR valve during idle conditions of the engine, the exhaust pulse after flameout may cause a portion of the exhaust gas to remain in the sealed cavity between the EGR valve and the check valve, resulting in a residual pressure. When the ECU (engine control unit) performs sensor zero point diagnosis, residual pressure can cause the sensor reading to deviate from a real zero point, so that false alarm or self-learning failure is caused, the accuracy of EGR flow calculation is finally affected, and the control of an EGR valve is abnormal, emission exceeds standard and even engine performance is reduced.

Disclosure of Invention

The application mainly aims to provide a method and a device for determining a reference value of an EGR valve front pressure sensor, a computer readable storage medium and electronic equipment, so as to at least solve the problems of inaccurate EGR flow calculation caused by inaccurate detection of the pressure value of the EGR valve front pressure sensor in the prior art, thereby influencing the control of the EGR valve and causing excessive engine emission and reduced performance.

In order to achieve the above object, according to one aspect of the present application, there is provided a reference value determining method of an EGR valve front pressure sensor, including acquiring temperature data in real time in the case of detecting power-up of a vehicle, and determining an EGR valve front pressure value of the vehicle in a cold state and a hot state according to the temperature data, to obtain a first EGR valve front pressure value and a second EGR valve front pressure value, wherein the temperature data includes an ambient temperature, a first engine water temperature, and an engine post-processing temperature, acquiring a second engine water temperature in the case of detecting power-down of the vehicle, controlling an EGR valve to be opened for a first preset period of time to be closed according to at least the second engine water temperature, and determining a third EGR valve front pressure value of the vehicle after the EGR valve is closed, and determining a reference value of the EGR valve front pressure sensor according to the first EGR valve front pressure value, the second EGR valve front pressure value, and the third EGR valve front pressure value, wherein the reference value is used for evaluating measurement accuracy of the EGR valve front pressure sensor.

Optionally, determining the reference point of the EGR valve front pressure sensor according to the first EGR valve front pressure value, the second EGR valve front pressure value, and the third EGR valve front pressure value includes performing weighted average processing on the first EGR valve front pressure value, the second EGR valve front pressure value, and the third EGR valve front pressure to obtain a pressure deviation value, and taking the pressure deviation value as the reference value of the EGR valve front pressure sensor.

Optionally, the EGR valve is controlled to be opened for a first preset time period and then closed at least according to the second engine water temperature, and the method comprises the steps of obtaining a fourth EGR valve front pressure value and an EGR valve opening degree table under the condition that the second engine water temperature is larger than a water temperature set value, wherein the EGR valve opening degree table is a relation table of the fourth EGR valve front pressure value, the second engine water temperature and the EGR valve opening degree, determining the EGR valve opening degree according to the EGR valve opening degree table, the fourth EGR valve front pressure value and the second engine water temperature, controlling the opening degree of the EGR valve to be adjusted to the EGR valve opening degree, and controlling the EGR valve to be closed after the first preset time period.

Optionally, determining the front pressure value of the EGR valve of the vehicle in the cold vehicle state and the hot vehicle state according to the temperature data to obtain a first front pressure value of the EGR valve and a second front pressure value of the EGR valve, wherein the method comprises the steps of determining the maximum difference value between any two temperature data among the ambient temperature, the first engine water temperature and the engine aftertreatment temperature, determining that the vehicle is in the cold vehicle state and the first front pressure value when the maximum difference value is smaller than a preset difference value, and determining that the vehicle is in the hot vehicle state and the second front pressure value when the water temperature difference value between the first engine water temperature and the ambient temperature is larger than a preset water temperature difference value.

Optionally, after the first EGR valve front pressure value and the second EGR valve front pressure value are obtained, the method further includes obtaining an initial reference value of the vehicle, where the initial reference value is a reference value obtained in a previous driving cycle of the vehicle, comparing the first EGR valve front pressure value and the initial reference value to obtain a first comparison result, determining whether the first EGR valve front pressure value is valid according to the first comparison result, comparing the second EGR valve front pressure value and the initial reference value to obtain a second comparison result, and determining whether the second EGR valve front pressure value is valid according to the second comparison result.

Optionally, comparing the first EGR valve front pressure value with the initial reference value to obtain a first comparison result, and determining whether the first EGR valve front pressure value is valid according to the first comparison result includes determining that the first EGR valve front pressure value is valid when a first difference absolute value between the first EGR valve front pressure value and the initial reference value is within a preset difference range, comparing the second EGR valve front pressure value with the initial reference value to obtain a second comparison result, and determining whether the second EGR valve front pressure value is valid according to the second comparison result includes determining that the second EGR valve front pressure value is valid when a second difference absolute value between the second EGR valve front pressure value and the initial reference value is within the preset difference range.

Optionally, determining the pre-EGR valve pressure value of the vehicle comprises collecting a plurality of initial pre-EGR valve pressure values through the pre-EGR valve pressure sensor according to a preset time step in a second preset time period, and determining an average value of the plurality of initial pre-EGR valve pressure values as the pre-EGR valve pressure value.

According to another aspect of the application, a reference value determining device of an EGR valve front pressure sensor is provided, and the reference value determining device comprises a first determining unit, a second determining unit and a third determining unit, wherein the first determining unit is used for acquiring temperature data in real time under the condition that the power-on of a vehicle is detected, determining an EGR valve front pressure value of the vehicle in a cold vehicle state and a hot vehicle state according to the temperature data, obtaining a first EGR valve front pressure value and a second EGR valve front pressure value, the temperature data comprises an ambient temperature, a first engine water temperature and an engine post-processing temperature, the EGR valve front pressure value is acquired by the EGR valve front pressure sensor, the second determining unit is used for acquiring a second engine water temperature under the condition that the power-on of the vehicle is detected, controlling the EGR valve to be closed after the first preset time period at least according to the second engine water temperature, and determining a third EGR valve front pressure value of the vehicle after the EGR valve is closed, and determining the EGR valve front pressure value according to the first EGR valve front pressure value, the second valve front pressure value and the third EGR valve front pressure value, wherein the reference value is used for evaluating the reference value accuracy of the EGR valve front pressure sensor.

According to still another aspect of the present application, there is provided a computer-readable storage medium including a stored program, wherein the program, when run, controls a device in which the computer-readable storage medium is located to execute any one of the reference value determining methods of the EGR valve front pressure sensor.

According to still another aspect of the present application, there is provided an electronic device including one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including a reference value determination method for executing any one of the EGR valve front pressure sensors.

By the technical scheme, temperature data are obtained in real time under the condition that the power-on of the vehicle is detected, the front pressure value of the EGR valve of the vehicle in a cold state and a hot state is determined according to the temperature data, a first front pressure value of the EGR valve and a second front pressure value of the EGR valve are obtained, the temperature data comprise ambient temperature, first engine water temperature and engine post-treatment temperature, the second engine water temperature is obtained under the condition that the power-on of the vehicle is detected, the EGR valve is controlled to be opened for a first preset time period at least according to the second engine water temperature and then closed, a third front pressure value of the EGR valve of the vehicle is determined after the EGR valve is closed, and a reference value of the front pressure sensor of the EGR valve is determined according to the first front pressure value of the EGR valve, the second front pressure value of the EGR valve and the third front pressure value of the EGR valve, wherein the reference value is used for evaluating measurement accuracy of the front pressure sensor of the EGR valve. By dynamically monitoring the temperature state of the vehicle, the cold vehicle state and the hot vehicle state are intelligently distinguished, and further the pressure values in front of the EGR valve are respectively collected, so that the change characteristics of the pressure in front of the EGR valve under different working conditions can be accurately captured, and key data support is provided for subsequent reference value determination. After the vehicle is powered down, the EGR valve is controlled to be opened for a certain time to be closed again, so that the influence of residual pressure possibly existing is eliminated, and the collected third EGR valve front pressure value represents a purer zero pressure state. Finally, by comprehensively analyzing the three pressure values, the reference value of the pressure sensor in front of the EGR valve is determined, and the accurate determination of the reference value greatly improves the measurement accuracy of the sensor, ensures the stability and reliability of the EGR system under various working conditions, and solves the problems of zero drift of the sensor caused by factors such as temperature change, residual pressure and the like in the traditional method, thereby optimizing the engine performance and emission control, and solving the problems of inaccurate detection pressure value of the pressure sensor in front of the EGR valve, inaccurate calculation of the EGR flow, influence on the control of the EGR valve, and excessive engine emission and reduced performance of the engine.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

Fig. 1 is a block diagram showing a hardware configuration of a mobile terminal that performs a reference value determination method of a pre-EGR valve pressure sensor provided in an embodiment according to the present application;

Fig. 2 is a flowchart schematically showing a method for determining a reference value of an EGR valve front pressure sensor according to an embodiment of the present application;

FIG. 3 illustrates a flow diagram for EGR valve opening adjustment provided in accordance with an embodiment of the present application;

FIG. 4 illustrates a flow chart for determining an EGR valve front pressure value provided in accordance with an embodiment of the present application;

FIG. 5 illustrates a flow chart of a method of determining a reference value for a specific EGR valve front pressure sensor provided in accordance with an embodiment of the present application;

Fig. 6 shows a block diagram of a reference value determining apparatus of an EGR valve front pressure sensor according to an embodiment of the present application.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

For convenience of description, the following will describe some terms or terminology involved in the embodiments of the present application:

ECU Electronic Control Unit, electronic control unit, memory engine control strategy, etc.

The EGR valve front pressure sensor is arranged in front of the EGR valve and is mainly used for calculating the EGR flow.

As introduced in the background art, the pressure value detected by the pressure sensor before the EGR valve in the prior art is inaccurate, so that the calculation of the EGR flow is inaccurate, the control of the EGR valve is affected, the emission of an engine exceeds the standard, and the performance is reduced.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

The method embodiments provided in the embodiments of the present application may be performed in a mobile terminal, a computer terminal or similar computing device. Taking a mobile terminal as an example, fig. 1 is a block diagram of a hardware structure of a mobile terminal according to a method for determining a reference value of a pressure sensor before an EGR valve according to an embodiment of the present application. As shown in fig. 1, a mobile terminal may include one or more (only one is shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a microprocessor MCU or a processing device such as a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 for communication functions and an input-output device 108. It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely illustrative and not limiting of the structure of the mobile terminal described above. For example, the mobile terminal may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1.

The memory 104 may be used to store a computer program, for example, a software program of application software and a module, such as a computer program corresponding to a method for determining a reference value of an EGR valve front pressure sensor in the embodiment of the present invention, and the processor 102 executes various functional applications and data processing by executing the computer program stored in the memory 104, that is, implements the method described above. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as a NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is configured to communicate with the internet wirelessly.

In the present embodiment, there is provided a reference value determination method of an EGR pre-valve pressure sensor operating on a mobile terminal, a computer terminal, or the like, it is to be noted that the steps shown in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical sequence is shown in the flowchart, in some cases, the steps shown or described may be performed in a sequence other than that shown herein.

Fig. 2 is a flowchart of a reference value determination method of an EGR valve front pressure sensor according to an embodiment of the present application. As shown in fig. 2, the method comprises the steps of:

Step S201, under the condition that the power-on of the vehicle is detected, temperature data are obtained in real time, and the front pressure value of the EGR valve of the vehicle in a cold state and a hot state is determined according to the temperature data, so that a first front pressure value of the EGR valve and a second front pressure value of the EGR valve are obtained, wherein the temperature data comprise the ambient temperature, the first engine water temperature and the engine post-treatment temperature;

The cold state is considered as the cold state when the deviation between the maximum temperature and the minimum temperature of the ambient temperature, the engine water temperature and the post-treatment temperature is within a certain range (can be calibrated according to a test, for example, 10 ℃). The EGR valve front pressure value is acquired by an EGR valve front pressure sensor.

Hot car condition-engine water temperature exceeds ambient temperature by a certain extent (which can be calibrated by test, for example 40 ℃) and the hot car is considered to be finished.

After the first EGR valve front pressure value and the second EGR valve front pressure value are obtained, a reference value of an EGR valve front pressure sensor obtained in a previous driving cycle is obtained, and the first EGR valve front pressure value and the previous driving cycle reference value and the second EGR valve front pressure value and the previous driving cycle reference value are compared to determine whether the first EGR valve front pressure value and the second EGR valve front pressure value are valid.

Step S202, under the condition that the vehicle is detected to be electrified, acquiring a second engine water temperature, controlling an EGR valve to be opened for a first preset time period at least according to the second engine water temperature, closing the EGR valve, and determining a third EGR valve front pressure value of the vehicle after the EGR valve is closed;

Specifically, after the vehicle is detected to be powered down and the engine is stopped, the ECU actively drives the EGR valve to be opened briefly (for example, to be opened to 10% -20% of opening), and residual waste gas in the sealed cavity in front of the valve is led out of the engine through an EGR pipeline by utilizing the pressure difference between the EGR system and the air inlet manifold, so that the pressure in the cavity is quickly balanced with the ambient pressure. The first preset time period is started, the pressure release is ensured through calibration test optimization (for example, 3-5 seconds), the first preset time period is controlled according to the time from the power-down to the stop of the ECU, 3-5 seconds are generally selected, for example, 3 seconds are selected according to the requirement of the power-down time of the ECU.

And step S203, determining a reference value of the EGR valve front pressure sensor according to the first EGR valve front pressure value, the second EGR valve front pressure value and the third EGR valve front pressure value, wherein the reference value is used for evaluating the measurement precision of the EGR valve front pressure sensor.

The reference value is used for comparing the reference value of the current driving cycle with the first EGR valve front pressure value and the second EGR valve front pressure value of the next driving cycle in the process of the next driving cycle of the vehicle to determine whether the first EGR valve front pressure value and the second EGR valve front pressure value of the next driving cycle are valid or not, and if the first EGR valve front pressure value and the second EGR valve front pressure value of the next driving cycle are invalid, the measured value of the EGR valve front pressure sensor is inaccurate.

Through the embodiment, the above steps S201, S202 and S203 are applied, and by dynamically monitoring the temperature states of the vehicle, such as the ambient temperature (i.e. the temperature of the surrounding environment of the vehicle), the first engine water temperature (i.e. the temperature of the engine coolant) and the engine post-treatment temperature (i.e. the temperature of the exhaust gas post-treatment system), the cold vehicle state and the hot vehicle state are intelligently distinguished, and further, the pressure values before the EGR valve are respectively collected. After the vehicle is powered down, the EGR valve is controlled to be opened for a certain time to be closed again, so that the influence of residual pressure possibly existing is eliminated, and the collected third EGR valve front pressure value represents a purer zero pressure state. Finally, by comprehensively analyzing the three pressure values, the reference value of the pressure sensor in front of the EGR valve is determined, and the accurate determination of the reference value greatly improves the measurement accuracy of the sensor, ensures the stability and reliability of the EGR system under various working conditions, and solves the problems of zero drift of the sensor caused by factors such as temperature change, residual pressure and the like in the traditional method, thereby optimizing the engine performance and emission control, and solving the problems of inaccurate detection pressure value of the pressure sensor in front of the EGR valve, inaccurate calculation of the EGR flow, influence on the control of the EGR valve, and excessive engine emission and reduced performance of the engine.

In the specific implementation process, determining the reference point of the EGR valve front pressure sensor according to the first EGR valve front pressure value, the second EGR valve front pressure value and the third EGR valve front pressure value comprises the steps of carrying out weighted average processing on the first EGR valve front pressure value, the second EGR valve front pressure value and the third EGR valve front pressure to obtain a pressure deviation value, and taking the pressure deviation value as the reference value of the EGR valve front pressure sensor.

The calculation formula for determining the reference value is as follows:

p= (p1×fac1+p2×fac2+p3×fac3)/(fac1+fac2+fac3), the reference value P is determined, P1 is the first EGR valve front pressure value, P2 is the second EGR valve front pressure value, P3 is the third EGR valve front pressure value, and fac1, fac2, and fac3 are the corresponding weighting factors.

The method can more scientifically integrate the pressure value information from different working conditions through weighted average processing, and the weight of each pressure value can be adjusted according to the importance and reliability of the represented working condition. For example, the first EGR valve front pressure value in the cold state is weighted higher in consideration of the fact that the engine internal pressure is close to the atmospheric pressure at this time, whereas the second EGR valve front pressure value in the hot state is weighted more heavily by the engine operating state, but can reflect the performance of the sensor in the high-temperature environment. The value of the third EGR valve front pressure after flameout is extremely high in zero reference value due to the active pressure relief, and the weight setting is usually the largest. The processing mode not only considers the performance difference of the sensor at different temperatures, but also effectively eliminates the interference of accidental factors, the finally obtained reference value is closer to the real zero point, the measurement precision and stability of the pressure sensor in front of the EGR valve are greatly improved, the problem of measurement errors caused by data acquisition under a single working condition is solved, and a solid foundation is provided for the accurate control and emission optimization of the engine.

Specifically, the EGR valve is controlled to be opened for a first preset period of time and then closed at least according to the second engine water temperature, as shown in fig. 3, and includes the following steps:

step S301, when the second engine water temperature is greater than a water temperature set value, a fourth EGR valve front pressure value and an EGR valve opening degree table are obtained, wherein the EGR valve opening degree table is a relation table of the fourth EGR valve front pressure value, the second engine water temperature and the EGR valve opening degree;

and S302, determining the opening degree of the EGR valve according to the opening degree table of the EGR valve, a fourth front pressure value of the EGR valve and the second engine water temperature, controlling the opening degree of the EGR valve to be adjusted to the opening degree of the EGR valve, and controlling the EGR valve to be closed after the first preset time period.

The method comprises the steps of after the vehicle is powered down, intelligently controlling the opening degree of the EGR valve according to an EGR valve opening degree table (table data containing the relation among the pressure before the EGR valve, the engine water temperature and the opening degree of the EGR valve) when the second engine water temperature (namely the engine water temperature when the engine is turned off) exceeds a specific set value, wherein the control strategy comprises, but is not limited to, searching the EGR valve opening degree table according to the actual pressure value before the EGR valve and the engine water temperature when the second engine water temperature is higher than a preset threshold value, determining the proper opening degree of the EGR valve, and then controlling the EGR valve to be opened and maintained for a period of time so as to release residual pressure possibly existing. The process not only can ensure the quick response of the EGR valve after flameout, but also can effectively avoid the damage of mechanical parts of the EGR valve caused by overhigh temperature, and prolongs the service life of the EGR valve. By the mode, the system can still maintain the measurement accuracy and stability of the pressure sensor in front of the EGR valve under the condition that the engine is at a higher temperature, the problem of zero point offset of the sensor caused by failure to timely release residual pressure after flameout in the traditional method is solved, the overall performance of the EGR system is improved, and guarantee is provided for long-term stable operation and emission standard of the engine.

More specifically, the method for determining the EGR valve front pressure value of the vehicle in the cold state and the hot state according to the temperature data, to obtain a first EGR valve front pressure value and a second EGR valve front pressure value, as shown in fig. 4, includes the following steps:

Step S401, determining the maximum difference value between any two temperature data among the ambient temperature, the first engine water temperature and the engine aftertreatment temperature;

Step S402, determining that the vehicle is in the cold state and determining the first EGR valve front pressure value under the condition that the maximum difference is smaller than a preset difference;

step S403, when the water temperature difference between the first engine water temperature and the ambient temperature is larger than a preset water temperature difference, determining that the vehicle is in the hot state, and determining the second EGR valve front pressure value.

The preset difference value and the preset water temperature difference value are set according to specific cold car and hot car judging requirements, for example, the preset difference value can be set to 10 ℃, and the preset water temperature difference value can be set to 40 ℃.

The method adopts a temperature difference analysis method to intelligently judge the cold and hot states of the vehicle, compares the maximum difference value of any two groups of temperature data among the ambient temperature, the first engine water temperature and the engine post-treatment temperature, and when the difference value is lower than a preset cold state threshold value, the system judges that the vehicle is in a cold state, and the collected EGR valve front pressure value is used as a first EGR valve front pressure value for determining a subsequent cold state reference value. Otherwise, if the difference between the first engine water temperature and the ambient temperature exceeds the preset hot state threshold, the system determines that the vehicle is in a hot state, and the collected EGR valve front pressure value at this time is used as a second EGR valve front pressure value for determining the hot state reference value. The method not only can accurately distinguish the running states of the vehicle, but also can adopt corresponding pressure value acquisition strategies according to different states, thereby avoiding measurement errors caused by inaccurate state judgment, ensuring that the pressure sensor in front of the EGR valve can obtain an accurate reference value at the initial stage of starting the vehicle, solving the problem of unstable control of the EGR system in the cold and hot vehicle state, and improving the running efficiency and emission performance of the engine.

Further, after the first EGR valve front pressure value and the second EGR valve front pressure value are obtained, the method further includes obtaining an initial reference value of the vehicle, where the initial reference value is a reference value obtained in a driving cycle of the vehicle, comparing the first EGR valve front pressure value and the initial reference value to obtain a first comparison result, determining whether the first EGR valve front pressure value is valid according to the first comparison result, and comparing the second EGR valve front pressure value and the initial reference value to obtain a second comparison result, and determining whether the second EGR valve front pressure value is valid according to the second comparison result.

The method introduces a reference value validity verification mechanism. After each time of vehicle start, the system automatically calls an initial reference value recorded in the last driving cycle, and then compares the initial reference value with a first EGR valve front pressure value in the current cold state and a second EGR valve front pressure value in the hot state for analysis. The verification mechanism can not only prevent abnormal data caused by sensor faults or environmental abrupt changes from being misused, but also ensure that the reference value collected each time reflects the real state of the EGR system, thereby improving the measurement precision and stability of the pressure sensor before the EGR valve, solving the problem of control misalignment of the EGR system caused by invalid data, and ensuring the efficient operation and emission reaching standards of the engine under different working conditions.

Further, comparing the first EGR valve front pressure value with the initial reference value to obtain a first comparison result, and determining whether the first EGR valve front pressure value is valid according to the first comparison result includes determining that the first EGR valve front pressure value is valid when a first difference absolute value between the first EGR valve front pressure value and the initial reference value is within a preset difference range, comparing the second EGR valve front pressure value with the initial reference value to obtain a second comparison result, and determining whether the second EGR valve front pressure value is valid according to the second comparison result includes determining that the second EGR valve front pressure value is valid when a second difference absolute value between the second EGR valve front pressure value and the initial reference value is within the preset difference range.

And under the condition that the absolute value of the difference value is not in the preset difference value range, the collected front pressure value of the EGR valve is considered to be invalid.

Specifically, the system calculates the absolute value of the difference between the first EGR valve front pressure value and the initial reference value of the previous driving cycle, and if this difference falls within a preset reasonable range, considers the first EGR valve front pressure value to be valid, and otherwise considers it to be invalid. Similarly, a similar absolute difference determination is made for the second EGR valve front pressure value to confirm its effectiveness. The judging method is simple and feasible, can effectively eliminate abnormal fluctuation, ensures that each reference value update is based on reliable data, avoids unstable control of an EGR system caused by data fluctuation, solves the problem that a sensor measured value is interfered by external factors, and provides powerful support for accurate control and emission optimization of an engine.

The method comprises the steps of collecting a plurality of initial EGR valve front pressure values through the EGR valve front pressure sensor in a second preset time step, and determining the average value of the plurality of initial EGR valve front pressure values as the EGR valve front pressure value.

Wherein the second preset time period may be set to 1s and the preset time step is set to 0.01s;

In order to further improve the measurement accuracy of the front pressure value of the EGR valve, the technical scheme adopts a method for determining the average value of multiple sampling. During a second predetermined time period after vehicle start-up, the system will continuously collect a plurality of initial EGR valve front pressure values via the EGR valve front pressure sensor in a predetermined time step (e.g., data collected every few seconds). The final EGR pre-valve pressure value is then obtained by averaging these pressure values. The method not only can effectively filter accidental noise interference, but also can reflect the real pressure change trend of the EGR system in a short time, and ensures the stability and reliability of the pressure value. Through the determination of the average value of multiple sampling, the system can more accurately capture the tiny change of the front pressure of the EGR valve, solves the problem of random error caused by single measurement, and provides more accurate data support for accurate control and emission standard reaching of the engine.

In addition, the embodiment also comprises a dynamic temperature difference compensation mechanism, wherein the dynamic temperature difference compensation mechanism is introduced on the basis of a multi-scene self-learning value fusion mechanism, and the weight factors of the self-learning values are automatically adjusted according to the temperature difference changes of different parts (such as a cylinder body, an exhaust manifold and cooling liquid) before and after the engine is stopped. Specifically, after the ECU monitors engine shutdown, each key site temperature will continue to be recorded until a preset threshold is reached (e.g., down to ambient temperature ± 10 ℃). At this time, according to the recorded temperature difference data, the ECU calculates a corresponding compensation coefficient for adjusting weights of the cold car, the hot car and the self-learning value after the pressure release by a preset algorithm.

Suppose that at some point in time after engine shutdown, the ECU monitors that the water temperature has fallen from 90 ℃ to 75 ℃ and that the ambient temperature is 25 ℃. The ECU will look up a pre-calibrated compensation coefficient table based on the temperature difference (50 ℃) between 75 ℃ and 25 ℃ to derive the corresponding compensation coefficient (e.g., coefficient 1.2). Subsequently, when calculating the final deviation value P, the compensation coefficient will be applied to the self-learned value P2 in the corresponding scenario. The mechanism can more accurately reflect the influence of temperature change on residual pressure, and ensures that a self-learning value is closer to an actual working condition.

The dynamic temperature difference compensation mechanism enables the self-learning process of the pressure sensor in front of the EGR valve not to be limited by static conditions any more, and the self-learning process can be dynamically adjusted to adapt to the transition of the engine from a hot car to a cold car, so that the self-learning precision is remarkably improved. In addition, this feature enhances the flexibility and robustness of the system, ensuring accuracy and consistency of sensor zero calibration even under extreme temperature fluctuations.

The present embodiment also includes an ambient pressure fluctuation compensation function, and fluctuations in the atmospheric pressure in the environment may also affect the zero point diagnosis of the pressure sensor in front of the EGR valve in consideration of the diversity of the vehicle operating environment. Therefore, the present embodiment adds the ambient pressure fluctuation compensation function to the ECU. The function counteracts the influence of the environmental pressure change by continuously monitoring the trend of the environmental pressure change, and automatically adjusting the datum line of the self-learning value P1/P2/P3 by the ECU when detecting that the environmental pressure fluctuation exceeds a preset threshold (for example + -10 hPa).

For example, when a vehicle enters a plains area after traveling on a plateau, the ambient pressure may increase from 750hPa to 1000hPa due to the decrease in altitude. At this time, the ECU performs not only the conventional EGR pre-valve pressure release and self-learning routine, but also additionally takes into consideration the change in the ambient pressure. If the ECU detects an increase in the ambient pressure of 250hPa, the ECU will automatically subtract each value by 250hPa (or a corresponding correction value based on a look-up table of the current water temperature) when calculating the self-learned value P1/P2/P3, ensuring that the zero point diagnosis of the pressure sensor is not affected even in the event of a large change in the ambient pressure.

The environment pressure fluctuation compensation function effectively solves the potential interference of external atmospheric pressure change to sensor zero diagnosis, and ensures the reliability and accuracy of the EGR system in different geographic environments. This is particularly important for large vehicles that need to operate under varying environmental conditions, where deviations in sensor readings due to environmental pressure changes can be prevented, thereby maintaining consistency in EGR flow control, reducing emissions, and improving overall engine performance.

In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation procedure of the reference value determining method of the EGR valve front pressure sensor of the present application will be described in detail with reference to specific embodiments.

The present embodiment relates to a specific method for determining a reference value of an EGR valve front pressure sensor, as shown in fig. 5, including the following:

And under the condition that the vehicle is electrified and not started, determining whether the vehicle is in a cold state or not according to the ambient temperature, the engine water temperature and the post-treatment temperature, wherein the cold state is defined as that the deviation between the maximum temperature and the minimum temperature of the ambient temperature, the water temperature and the post-treatment temperature is within a certain range (can be calibrated according to a test, for example, 10 ℃) and the cold state is considered to be started. Under the condition of cold starting, carrying out EGRP sensor deviation judgment, carrying out self-learning record P1 value, and judging deviation between the self-learning P1 value and the P value stored in the previous driving cycle, wherein the deviation is weighted (weight factor fac 1) in a range;

In the hot car state, according to the temperature difference/stop time when the water temperature exceeds the ambient temperature, the opening degree and the duration time for driving the EGR valve to open are obtained through table lookup, the zero deviation judgment of an EGRP sensor is carried out, the self-learning record P2 value is carried out, the deviation judgment between the self-learning P2 value and the P value stored in the previous driving cycle is carried out, if the deviation is within the range, weighting (weighting factor fac 2) is carried out, wherein in the hot car state, the water temperature of an engine exceeds the ambient temperature by a certain range (can be calibrated according to a test, for example, 40 ℃) and the hot car is considered to be completed.

The duration of general opening is controlled according to the time from the powering-down of the ECU to the stopping of the work, and is generally 3-5s, for example, 3s is selected according to the requirement of the powering-down time of the ECU;

the opening degree of the EGR valve is obtained by table lookup, and the opening degree of the EGR valve is obtained by table lookup in the ECU according to the front pressure of the EGR valve and the water temperature of the engine, as shown in table 1, and the table in the ECU is obtained by test, and the opening degree of the EGR valve is adjusted under different water temperatures of the engine and the front pressure of the EGR valve, so that the front pressure of the EGR valve is ensured to be reduced to the final stable pressure within 3 seconds.

TABLE 1

In the vehicle power-down state, after the vehicle rotation speed reaches 0, if the engine water temperature is higher than 60 ℃, the EGR valve is actively driven to open for a certain opening degree and time, as shown in table 1, the zero deviation judgment of the EGRP sensor is carried out, the self-learning record P3 value is carried out, the weighted summation is carried out according to the current P3 and the stored P1 and P2 when the vehicle is powered up, the P value of the current driving cycle is obtained, and the P value is stored.

Specifically, in the vehicle power-down state, after the engine is stopped, the ECU actively drives the EGR valve to be opened briefly (for example, to be opened to 10% -20% of opening), and residual waste gas in the sealed cavity in front of the valve is led out of the engine through an EGR pipeline by utilizing the pressure difference between the EGR system and the air inlet manifold, so that the pressure in the cavity is quickly balanced with the ambient pressure. The opening time is optimized by calibration tests (e.g. 3-5 seconds) to ensure pressure release.

The thermal expansion in the hot engine state is influenced by the fact that the air in the cavity is influenced by the heat radiation in the just-stopped state, and the pressure is higher than that measured in the cold engine state.

And the multi-scene self-learning value fusion mechanism is used for carrying out self-learning and judgment on the power-on state and the power-off state in each driving cycle, wherein the power-on state respectively learns different values according to the hot car state and the cold car state, and the self-learning is carried out after the EGR valve is actively driven to release pressure so as to avoid the condition of residual waste gas in a closed cavity during power-off. And carrying out weighted fusion on the data according to the learned values in the three states, wherein the weighting factors can be calibrated. In general, when the vehicle is driven in a cold state, the weight fac1 is the largest, and when the vehicle is driven in a hot state, the learned fac2 and fac3 are subjected to lookup of the weight factors according to the temperature of the cooled temperature of the EGR, and the weight is gradually increased from the high temperature to the low temperature.

According to the formula P= (P1×fac1+P2×fac2+P3×fac3)/(fac1+fac2+fac3), the P value is determined, and fac1, fac2 and fac3 are corresponding weight factors as reference points of the EGRP sensor. The ECU measures the original voltage signal of the EGRP sensor, converts the original voltage signal into a pressure signal, makes a difference with the ambient pressure, takes an average value of a certain number of times (for example, takes 20 times once in 0.01 s), and records the average value as P1, P2 and P3.

The method breaks through the limitation of traditional static diagnosis, and the ECU actively drives the EGR valve to open after flameout to forcedly empty the residual pressure, so that a real zero calibration environment is provided for the sensor. And the intelligent triggering logic with multi-condition cooperation is used for avoiding misdiagnosis caused by the thermal state or environmental interference of the engine by combining multi-dimensional parameters such as temperature, time, pressure stability and the like. And a self-learning fault-tolerant mechanism is used for introducing self-learning values under multiple situations to perform data fusion, so that zero robustness is improved, and the influence of sporadic interference is reduced.

The embodiment of the application also provides a reference value determining device of the front pressure sensor of the EGR valve, and the reference value determining device of the front pressure sensor of the EGR valve can be used for executing the reference value determining method for the front pressure sensor of the EGR valve. The device is used for realizing the above embodiments and preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

The reference value determining device of the EGR valve front pressure sensor provided by the embodiment of the present application is described below.

Fig. 6 is a schematic diagram of a reference value determining apparatus of an EGR valve front pressure sensor according to an embodiment of the present application. As shown in fig. 6, the apparatus includes:

A first determining unit 61, configured to obtain temperature data in real time when power-up of a vehicle is detected, and determine an EGR valve front pressure value of the vehicle in a cold state and a hot state according to the temperature data, to obtain a first EGR valve front pressure value and a second EGR valve front pressure value, where the temperature data includes an ambient temperature, a first engine water temperature, and an engine post-processing temperature, and the EGR valve front pressure value is acquired by an EGR valve front pressure sensor;

a second determining unit 62 configured to obtain a second engine water temperature when the vehicle power-down is detected, control the EGR valve to be opened for a first preset period of time based at least on the second engine water temperature, and determine a third EGR valve front pressure value of the vehicle after the EGR valve is closed;

And a third determination unit 63 configured to determine a reference value of the EGR valve front pressure sensor based on the first EGR valve front pressure value, the second EGR valve front pressure value, and the third EGR valve front pressure value, wherein the reference value is used to evaluate measurement accuracy of the EGR valve front pressure sensor.

In this embodiment, a first determining unit is configured to obtain temperature data in real time when power-up of the vehicle is detected, determine an EGR valve front pressure value of the vehicle in a cold state and a hot state according to the temperature data, and obtain a first EGR valve front pressure value and a second EGR valve front pressure value, where the temperature data includes an ambient temperature, a first engine water temperature, and an engine post-processing temperature, the EGR valve front pressure value is acquired by an EGR valve front pressure sensor, a second determining unit is configured to obtain a second engine water temperature when power-down of the vehicle is detected, control the EGR valve to be opened for a first preset period of time at least according to the second engine water temperature, and determine a third EGR valve front pressure value of the vehicle after the EGR valve is closed, and a third determining unit is configured to determine a reference value of the EGR valve front pressure sensor according to the first EGR valve front pressure value, the second EGR valve front pressure value, and the third EGR valve front pressure value, where the reference value is configured to evaluate measurement accuracy of the EGR valve front pressure sensor. The method comprises the steps of dynamically monitoring the temperature state of a vehicle, intelligently distinguishing the cold state from the hot state, further respectively collecting pressure values in front of an EGR valve, accurately capturing the change characteristics of the pressure in front of the EGR valve under different working conditions, providing key data support for subsequent reference value determination, after the vehicle is powered down, controlling the EGR valve to be opened for a certain time and then closed so as to eliminate possible residual pressure influence, then collecting the pressure values in front of the third EGR valve to represent a purer zero pressure state, finally, comprehensively analyzing the three pressure values to determine the reference value of the pressure sensor in front of the EGR valve, accurately determining the reference value, greatly improving the measurement accuracy of the sensor, ensuring the stability and reliability of an EGR system under various working conditions, and further optimizing the engine performance and emission control due to the fact that the pressure values detected by the pressure sensors in front of the EGR valve are inaccurate, the control of the engine is influenced, and the emission of the engine is out of standard and the performance is reduced.

As an alternative, the third determining unit includes a weighted average processing module configured to perform weighted average processing on the first EGR valve front pressure value, the second EGR valve front pressure value, and the third EGR valve front pressure value to obtain a pressure deviation value, and use the pressure deviation value as the reference value of the EGR valve front pressure sensor.

The second determining unit comprises a first obtaining module and a control module, wherein the first obtaining module is used for obtaining a fourth EGR valve front pressure value and an EGR valve opening degree table under the condition that the second engine water temperature is larger than a water temperature set value, the EGR valve opening degree table is a relation table of the fourth EGR valve front pressure value, the second engine water temperature and the EGR valve opening degree, and the control module is used for determining the EGR valve opening degree according to the EGR valve opening degree table, the fourth EGR valve front pressure value and the second engine water temperature, controlling the opening degree of the EGR valve to be adjusted to the EGR valve opening degree and controlling the EGR valve to be closed after the first preset time period.

The first determining unit comprises a first determining module, a second determining module and a third determining module, wherein the first determining module is used for determining the maximum difference value between any two temperature data among the ambient temperature, the first engine water temperature and the engine aftertreatment temperature, the second determining module is used for determining the vehicle to be in the cold state and determining the first EGR valve front pressure value when the maximum difference value is smaller than a preset difference value, and the third determining module is used for determining the vehicle to be in the hot state and determining the second EGR valve front pressure value when the water temperature difference value between the first engine water temperature and the ambient temperature is larger than the preset water temperature difference value.

The device further comprises an acquisition unit and a comparison unit, wherein the acquisition unit is used for acquiring an initial reference value of the vehicle after a first EGR valve front pressure value and a second EGR valve front pressure value are obtained, the initial reference value is a reference value obtained by a driving cycle of the vehicle, the comparison unit is used for comparing the first EGR valve front pressure value and the initial reference value to obtain a first comparison result, determining whether the first EGR valve front pressure value is effective according to the first comparison result, and comparing the second EGR valve front pressure value and the initial reference value to obtain a second comparison result, and determining whether the second EGR valve front pressure value is effective according to the second comparison result.

The comparison unit comprises a fourth determination module and a fifth determination module, wherein the fourth determination module is used for determining that the first EGR valve front pressure value is effective when the first difference absolute value of the first EGR valve front pressure value and the initial reference value is in a preset difference range, and the fifth determination module is used for determining that the second EGR valve front pressure value is effective when the second EGR valve front pressure value and the second difference absolute value of the initial reference value are in the preset difference range.

In an alternative solution, the apparatus further includes a fourth determining unit, configured to collect a plurality of initial EGR valve front pressure values by the EGR valve front pressure sensor in a second preset time period according to a preset time step, and determine an average value of the plurality of initial EGR valve front pressure values as the EGR valve front pressure value.

The reference value determining device of the EGR valve front pressure sensor includes a processor and a memory, the first determining unit, the second determining unit, the third determining unit, and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions. The modules are all located in the same processor, or the modules are respectively located in different processors in any combination.

The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The inner core can be provided with one or more than one, and the problems of exceeding emission standard and reducing performance of an engine caused by inaccurate calculation of EGR flow and influence on the control of the EGR valve due to inaccurate detection of a pressure value by a pressure sensor before the EGR valve in the prior art are solved by adjusting parameters of the inner core.

The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.

The embodiment of the invention provides a computer readable storage medium, which comprises a stored program, wherein the program is used for controlling equipment where the computer readable storage medium is positioned to execute a reference value determining method of the pressure sensor before the EGR valve.

Specifically, the reference value determination method of the EGR valve front pressure sensor includes:

The embodiment of the invention provides a processor, which is used for running a program, wherein the program runs to execute the method for determining the reference value of the pressure sensor before the EGR valve.

The embodiment of the invention provides an electronic device, which comprises a processor, a memory and a program stored on the memory and capable of running on the processor, wherein the processor realizes at least the following steps when executing the program:

The device herein may be a server, PC, PAD, cell phone, etc.

The application also provides a computer program product adapted to perform, when executed on a data processing device, a program initialized with at least the following method steps:

It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may be implemented in program code executable by computing devices, so that they may be stored in a storage device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 processor, 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.

In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A reference value determination method of an EGR valve front pressure sensor, characterized by comprising:

Under the condition that the power-on of the vehicle is detected, temperature data are obtained in real time, and an EGR valve front pressure value of the vehicle in a cold vehicle state and a hot vehicle state is determined according to the temperature data, so that a first EGR valve front pressure value and a second EGR valve front pressure value are obtained, wherein the temperature data comprise an ambient temperature, a first engine water temperature and an engine aftertreatment temperature;

Under the condition that the vehicle is powered down is detected, acquiring a second engine water temperature, controlling an EGR valve to be opened for a first preset time period at least according to the second engine water temperature, closing the EGR valve, and determining a third EGR valve front pressure value of the vehicle after the EGR valve is closed;

And determining a reference value of the EGR valve front pressure sensor according to the first EGR valve front pressure value, the second EGR valve front pressure value and the third EGR valve front pressure value, wherein the reference value is used for evaluating the measurement precision of the EGR valve front pressure sensor.

2. The method of claim 1, wherein determining the reference point of the EGR valve front pressure sensor based on the first EGR valve front pressure value, the second EGR valve front pressure value, and the third EGR valve front pressure value comprises:

and performing weighted average processing on the first EGR valve front pressure value, the second EGR valve front pressure value and the third EGR valve front pressure to obtain a pressure deviation value, and taking the pressure deviation value as the reference value of the EGR valve front pressure sensor.

3. The method of claim 1, wherein controlling EGR valve to open for a first predetermined period of time based at least on the second engine water temperature is followed by closing comprising:

Acquiring a fourth EGR valve front pressure value and an EGR valve opening degree table under the condition that the second engine water temperature is larger than a water temperature set value, wherein the EGR valve opening degree table is a relation table of the fourth EGR valve front pressure value, the second engine water temperature and the EGR valve opening degree;

Determining the opening degree of the EGR valve according to the opening degree table of the EGR valve, a fourth front pressure value of the EGR valve and the second engine water temperature, controlling the opening degree of the EGR valve to be adjusted to the opening degree of the EGR valve, and controlling the EGR valve to be closed after the first preset time period.

4. The method of claim 1, wherein determining the EGR pre-valve pressure values for the vehicle in the cold state and the hot state based on the temperature data to obtain the first EGR pre-valve pressure value and the second EGR pre-valve pressure value comprises:

determining a maximum difference between any two of the temperature data between the ambient temperature, the first engine water temperature, and the engine aftertreatment temperature;

Under the condition that the maximum difference value is smaller than a preset difference value, determining that the vehicle is in the cold vehicle state, and determining the first EGR valve front pressure value;

And under the condition that the water temperature difference value between the water temperature of the first engine and the ambient temperature is larger than a preset water temperature difference value, determining that the vehicle is in the hot vehicle state, and determining the front pressure value of the second EGR valve.

5. The method of claim 1, wherein after obtaining the first EGR pre-valve pressure value and the second EGR pre-valve pressure value, the method further comprises:

acquiring an initial reference value of the vehicle, wherein the initial reference value is a reference value obtained by a previous driving cycle of the vehicle;

Comparing the first EGR valve front pressure value with the initial reference value to obtain a first comparison result, determining whether the first EGR valve front pressure value is effective according to the first comparison result, comparing the second EGR valve front pressure value with the initial reference value to obtain a second comparison result, and determining whether the second EGR valve front pressure value is effective according to the second comparison result.

6. The method of claim 5, wherein the step of determining the position of the probe is performed,

Comparing the first EGR valve front pressure value with the initial reference value to obtain a first comparison result, and determining whether the first EGR valve front pressure value is effective according to the first comparison result, wherein the first comparison result comprises that the first EGR valve front pressure value is determined to be effective when a first difference absolute value between the first EGR valve front pressure value and the initial reference value is in a preset difference range;

Comparing the second EGR valve front pressure value with the initial reference value to obtain a second comparison result, and determining whether the second EGR valve front pressure value is effective according to the second comparison result comprises determining that the second EGR valve front pressure value is effective when a second difference absolute value between the second EGR valve front pressure value and the initial reference value is in the preset difference range.

7. The method of claim 1, wherein determining the vehicle pre-EGR valve pressure value comprises:

and collecting a plurality of initial EGR valve front pressure values through the EGR valve front pressure sensor according to a preset time step in a second preset time period, and determining the average value of the plurality of initial EGR valve front pressure values as the EGR valve front pressure value.

8. A reference value determining device of an EGR valve front pressure sensor, characterized by comprising:

The first determining unit is used for acquiring temperature data in real time under the condition that the power-on of the vehicle is detected, determining an EGR valve front pressure value of the vehicle in a cold vehicle state and a hot vehicle state according to the temperature data, and obtaining a first EGR valve front pressure value and a second EGR valve front pressure value, wherein the temperature data comprises an environment temperature, a first engine water temperature and an engine post-treatment temperature, and the EGR valve front pressure value is acquired by an EGR valve front pressure sensor;

a second determining unit, configured to obtain a second engine water temperature when the vehicle is detected to be powered down, control an EGR valve to be opened for a first preset period of time at least according to the second engine water temperature, and determine a third EGR valve front pressure value of the vehicle after the EGR valve is closed;

a third determination unit configured to determine a reference value of the EGR valve front pressure sensor according to the first EGR valve front pressure value, the second EGR valve front pressure value, and the third EGR valve front pressure value, wherein the reference value is used to evaluate measurement accuracy of the EGR valve front pressure sensor.

9. A computer-readable storage medium, characterized in that the computer-readable storage medium includes a stored program, wherein the program, when run, controls a device in which the computer-readable storage medium is located to execute the method of determining the reference value of the EGR valve front pressure sensor according to any one of claims 1 to 7.

10. An electronic device characterized by comprising one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising a reference value determination method for executing the EGR valve front pressure sensor according to any one of claims 1 to 7.