Reference value determination method for egr valve front pressure sensor and related device

Abstract

The application provides a method for determining a reference value of an EGR valve front pressure sensor and related devices. The method comprises: in the case of detecting that the vehicle is powered on, acquiring temperature data, determining the EGR valve front pressure values of the vehicle in the cold state and the hot state according to the temperature data, obtaining a first EGR valve front pressure value and a second EGR valve front pressure value, in the case of detecting that the vehicle is powered off, acquiring a second engine water temperature, controlling the EGR valve to be closed after being opened for a first preset time period according to the second engine water temperature, determining a third EGR valve front pressure value after the EGR valve is closed; and determining the 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. The method solves the problem that the pressure value detected by the EGR valve front pressure sensor in the prior art is inaccurate, which affects the control of the EGR valve and causes the engine emission to exceed the standard and the performance to decrease.

Description

TECHNICAL FIELD

[0001] The present 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 an electronic device. BACKGROUND

[0002] In a gas engine, an EGR (Exhaust Gas Recirculation) system monitors the pipeline pressure in real time through an EGR valve front pressure sensor, and calculates the EGR flow based on this to optimize combustion control. However, due to the presence of a one-way valve in the EGR pipeline and the fact that the EGR valve is often in a fully closed state under engine idle conditions, the exhaust pulse after misfire will cause some exhaust gas to remain in the closed cavity between the EGR valve and the one-way valve, forming residual pressure. When the ECU (Engine Control Unit) performs sensor zero point diagnosis, the residual pressure will cause the sensor reading to deviate from the true zero point, thereby causing false alarms or self-learning failures, ultimately affecting the accuracy of EGR flow calculation, causing abnormal control of the EGR valve, excessive emissions and even engine performance degradation. SUMMARY

[0003] The main purpose of the present application is to provide a reference value determination method and device of an EGR valve front pressure sensor, a computer readable storage medium and an electronic device, to at least solve the problem that the existing technology EGR valve front pressure sensor detects inaccurate pressure values, leading to inaccurate EGR flow calculation, thereby affecting the control of the EGR valve and causing excessive emissions and performance degradation of the engine.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a reference value determination method of an EGR valve front pressure sensor is provided, comprising: in the case of detecting that the vehicle is powered on, acquiring temperature data in real time, and determining the EGR valve front pressure values of the vehicle in cold state and hot state according to the temperature data, to obtain first EGR valve front pressure value and second EGR valve front pressure value, wherein the temperature data includes ambient temperature, first engine water temperature and engine aftertreatment temperature; in the case of detecting that the vehicle is powered off, acquiring second engine water temperature, controlling the EGR valve to open for a first preset time period and then close at least according to the second engine water temperature, and determining the third EGR valve front pressure value of the vehicle after the EGR valve is closed; determining the 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 the measurement accuracy of the EGR valve front pressure sensor.

[0005] 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 comprises: 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 value to obtain a pressure deviation value, and taking the pressure deviation value as the reference value of the EGR valve front pressure sensor.

[0006] Optionally, controlling the EGR valve to open for a first preset time period and then close according to at least the second engine water temperature comprises: in the case that the second engine water temperature is greater than a water temperature setting value, obtaining a fourth EGR valve front pressure value and an EGR valve opening degree table, wherein the EGR valve opening degree table is a 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, and controlling the opening degree of the EGR valve to adjust to the EGR valve opening degree; and controlling the EGR valve to close after the first preset time period.

[0007] Optionally, determining the 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 comprises: determining the maximum difference between any two of the temperature data among the ambient temperature, the first engine water temperature and the engine aftertreatment temperature; in the case that the maximum difference is less than a preset difference value, determining that the vehicle is in the cold state and determining the first EGR valve front pressure value; and in the case that the water temperature difference between the first engine water temperature and the ambient temperature is greater than a preset water temperature difference value, determining that the vehicle is in the hot state and determining the second EGR valve front pressure value.

[0008] Optionally, after obtaining the first EGR valve front pressure value and the second EGR valve front pressure value, the method further comprises: obtaining an initial reference value of the vehicle, wherein 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 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; and 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.

[0009] Optionally, the first EGR valve front pressure value and the initial reference value are compared to obtain a first comparison result, and whether the first EGR valve front pressure value is valid is determined according to the first comparison result, including: in a case where an absolute value of a first difference between the first EGR valve front pressure value and the initial reference value is located in a preset difference range, it is determined that the first EGR valve front pressure value is valid; the second EGR valve front pressure value and the initial reference value are compared to obtain a second comparison result, and whether the second EGR valve front pressure value is valid is determined according to the second comparison result, including: in a case where an absolute value of a second difference between the second EGR valve front pressure value and the initial reference value is located in the preset difference range, it is determined that the second EGR valve front pressure value is valid.

[0010] Optionally, the EGR valve front pressure value of the vehicle is determined, including: a plurality of initial EGR valve front pressure values are collected by the EGR valve front pressure sensor in a second preset time period according to a preset time step, and an average value of the plurality of initial EGR valve front pressure values is determined as the EGR valve front pressure value.

[0011] According to another aspect of the present application, an EGR valve front pressure sensor reference value determination device is provided, including: a first determination unit configured to, in a case where it is detected that a vehicle is powered on, acquire temperature data in real time, and determine EGR valve front pressure values of the vehicle in cold state and 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 aftertreatment temperature, and the EGR valve front pressure values are collected by an EGR valve front pressure sensor; a second determination unit configured to, in a case where it is detected that the vehicle is powered off, acquire a second engine water temperature, control an EGR valve to be opened for a first preset time period and then closed according to at least 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 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 a measurement accuracy of the EGR valve front pressure sensor.

[0012] According to still another aspect of the present application, a computer readable storage medium is provided, including a stored program, wherein when the program runs, the device where the computer readable storage medium is located is controlled to perform any one of the EGR valve front pressure sensor reference value determination methods.

[0013] According to another aspect of the present application, an electronic device is provided, 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, and the one or more programs comprise a program for performing any one of the methods for determining a reference value of an EGR valve front pressure sensor.

[0014] According to the technical solution of the present application, when it is detected that the vehicle is powered on, temperature data is acquired in real time, and the EGR valve front pressure values of the vehicle in the cold state and the hot state are determined 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 comprises an ambient temperature, a first engine water temperature and an engine aftertreatment temperature; when it is detected that the vehicle is powered off, a second engine water temperature is acquired, and the EGR valve is controlled to be opened for a first preset time period and then closed according to at least the second engine water temperature, and after the EGR valve is closed, a third EGR valve front pressure value of the vehicle is determined; and a reference value of the EGR valve front pressure sensor is determined 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 the measurement accuracy of the EGR valve front pressure sensor. By dynamically monitoring the temperature state of the vehicle, the cold state and the hot state are intelligently distinguished, and then the pressure values before the EGR valve are respectively acquired, so that the change characteristics of the EGR valve front pressure under different working conditions can be accurately captured, and key data support is provided for subsequent reference value determination. After the vehicle is powered off, the EGR valve is controlled to be opened for a certain time and then closed, so as to eliminate the influence of possible residual pressure, and then the third EGR valve front pressure value acquired represents a more pure zero pressure state. Finally, by comprehensively analyzing the three pressure values, the reference value of the EGR valve front pressure sensor is determined, 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, solves the problem of sensor zero drift caused by temperature change, residual pressure and other factors in the traditional method, optimizes the engine performance and emission control, and solves the problem that the pressure value detected by the EGR valve front pressure sensor in the prior art is inaccurate, which leads to inaccurate EGR flow calculation, thereby affecting the control of the EGR valve, causing the engine emission to exceed the standard and the performance to decrease. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein in conjunction with the description of the application. In the drawings:

[0016] Figure 1 A hardware structure block diagram of a mobile terminal for performing a method for determining a reference value of an EGR valve front pressure sensor is shown according to an embodiment of the present application.

[0017] Figure 2 A flowchart of a method for determining a reference value of an EGR valve front pressure sensor is shown according to an embodiment of the present application;

[0018] Figure 3 A flowchart of EGR valve opening degree adjustment is shown according to an embodiment of the present application;

[0019] Figure 4 A flowchart of determining an EGR valve front pressure value is shown according to an embodiment of the present application;

[0020] Figure 5 A flowchart of a method for determining a reference value of a specific EGR valve front pressure sensor is shown according to an embodiment of the present application;

[0021] Figure 6 A structural block diagram of a device for determining a reference value of an EGR valve front pressure sensor is shown according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The technical solutions in the embodiments of the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0025] For the convenience of description, the following describes some nouns or terms related to the embodiments of the present application:

[0026] ECU: Electronic Control Unit, which includes memory, engine control strategy, etc.

[0027] EGR valve inlet pressure sensor: Installed before the EGR valve, mainly used for EGR flow calculation.

[0028] As described in the background section, existing EGR valve inlet pressure sensors detect inaccurate pressure values, leading to inaccurate EGR flow calculations. This affects the control of the EGR valve, resulting in excessive engine emissions and performance degradation. To address this problem, embodiments of this application provide a method, apparatus, computer-readable storage medium, and electronic device for determining the reference value of an EGR valve inlet pressure sensor.

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a method of determining the reference value of an EGR valve inlet pressure sensor according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0031] The memory 104 can be used to store computer programs, such as software programs of application software and modules, such as the computer program corresponding to the method for determining the reference value of the EGR valve pre-pressure sensor in the embodiments of the present application. The processor 102 can execute various functional applications and data processing, i.e., implement the above method, by running the computer program stored in the memory 104. The memory 104 can include a high-speed random access memory, and can further include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 104 can further include a memory remotely arranged with respect to the processor 102, which can be connected to the mobile terminal through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The specific examples of the above network can include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet in a wireless manner.

[0032] In the embodiments, a method for determining a reference value of an EGR valve pre-pressure sensor running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown.

[0033] Figure 2 is a flowchart of the method for determining a reference value of an EGR valve pre-pressure sensor according to the embodiments of the present application. As shown in Figure 2 the method includes the following steps:

[0034] In step S201, when it is detected that the vehicle is powered on, temperature data is acquired in real time, and the EGR valve pre-pressure values of the vehicle in cold state and hot state are determined according to the temperature data, to obtain first EGR valve pre-pressure values and second EGR valve pre-pressure values, wherein the temperature data includes ambient temperature, first engine water temperature and engine aftertreatment temperature.

[0035] The cold state: the maximum temperature and the minimum temperature deviation of the ambient temperature, the engine water temperature and the aftertreatment temperature are within a certain range (which can be calibrated according to the test, for example, 10℃), and the cold state is considered.

[0036] The hot state: the engine water temperature is considered to have completed the hot state when it exceeds the ambient temperature by a certain range (which can be calibrated according to the test, for example, 40℃).

[0037] After obtaining the first EGR valve front pressure value and the second EGR valve front pressure value, the reference value of the EGR valve front pressure sensor obtained in the previous driving cycle is obtained, and the first EGR valve front pressure value and the second EGR valve front pressure value are compared with the reference value of the previous driving cycle to determine whether the first EGR valve front pressure value and the second EGR valve front pressure value are valid.

[0038] Step S202, after detecting that the vehicle is powered off, obtaining a second engine water temperature, and at least according to the second engine water temperature, controlling the EGR valve to be opened for a first preset time period and then closed, and determining a third EGR valve front pressure value of the vehicle after the EGR valve is closed;

[0039] Specifically, after detecting that the vehicle is powered off and the engine is stopped, the ECU actively drives the EGR valve to be opened for a short time (for example, to 10%-20% opening), and uses the pressure difference between the EGR system and the intake manifold to guide the residual exhaust gas in the valve front closed cavity out of the engine through the EGR pipeline, so that the pressure in the cavity is quickly balanced with the ambient pressure. The opening of the first preset time period is optimized through calibration test (for example, 3-5 seconds), to ensure pressure release; generally, the first preset time period is controlled according to the time from the ECU power-off to the stop of the work, and generally 3-5s is selected, for example, according to the requirement of the ECU power-off time, 3s is selected.

[0040] 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 to evaluate the measurement accuracy of the EGR valve front pressure sensor.

[0041] The reference value is used to compare 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 during 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, and in the case of invalidity, it is indicated that the measurement value of the EGR valve front pressure sensor is inaccurate.

[0042] By the above steps S201, S202 and S203, the temperature state of the vehicle, such as the ambient temperature (i.e. the temperature of the environment around the vehicle), the first engine water temperature (i.e. the temperature of the engine coolant) and the engine aftertreatment temperature (i.e. the temperature of the exhaust gas aftertreatment system), are dynamically monitored to intelligently distinguish between cold and hot vehicle states, and then the pressure value before the EGR valve is collected, which can accurately capture the variation characteristics of the pressure before the EGR valve under different working conditions, providing key data support for subsequent reference value determination. After the vehicle is powered off, the EGR valve is opened for a certain period of time and then closed to eliminate the influence of possible residual pressure, and the third pressure value before the EGR valve collected subsequently represents a more pure zero pressure state. Finally, by comprehensively analyzing the three pressure values, the reference value of the pressure sensor before 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, solves the problem of sensor zero drift caused by temperature changes, residual pressure and other factors in traditional methods, optimizes the engine performance and emission control, and solves the problem of inaccurate detection of the pressure value by the EGR valve pressure sensor in the prior art, which leads to inaccurate calculation of the EGR flow, thereby affecting the control of the EGR valve, causing the engine emission to exceed the standard and the performance to decrease.

[0043] In the specific implementation process, the reference point of the EGR valve pressure sensor is determined according to the first EGR valve pressure value, the second EGR valve pressure value and the third EGR valve pressure value, including: weighted average processing of the first EGR valve pressure value, the second EGR valve pressure value and the third EGR valve pressure value to obtain a pressure deviation value, and taking the pressure deviation value as the reference value of the EGR valve pressure sensor.

[0044] The calculation formula for determining the reference value is:

[0045] P=(P1×fac1+ P2×fac2+ P3×fac3) / (fac1+fac2+fac3), determine the reference value P, P1 is the first EGR valve pressure value, P2 is the second EGR valve pressure value, P3 is the third EGR valve pressure value, fac1, fac2 and fac3 are the corresponding weight factors.

[0046] The method can more scientifically fuse 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 working condition it represents. For example, the first EGR valve front pressure value in the cold state, considering that the internal pressure of the engine at this time is close to atmospheric pressure, its weight will be higher. The second EGR valve front pressure value in the hot state, although it is greatly affected by the engine operating state, it can reflect the performance of the sensor in a high temperature environment, and also gives a certain weight. The third EGR valve front pressure value after the engine is turned off, since it has undergone active pressure release, its zero reference value is extremely high, and the weight setting is usually the largest. This processing method not only considers the performance difference of the sensor at different temperatures, but also effectively eliminates the interference of accidental factors, so that the final reference value is closer to the true zero point, greatly improving the measurement accuracy and stability of the EGR valve front pressure sensor, and solving the measurement error problem caused by data collection in a single working condition. It provides a solid foundation for accurate engine control and emission optimization.

[0047] Specifically, the EGR valve is controlled to be opened for a first preset time period and then closed according to at least the second engine water temperature, and the EGR valve opening degree table is obtained according to the fourth EGR valve front pressure value and the second engine water temperature. Figure 3 As shown in the method, the method comprises the following steps:

[0048] Step S301: In the case where the second engine water temperature is greater than the water temperature setting value, the fourth EGR valve front pressure value and the EGR valve opening degree table are obtained, wherein the EGR valve opening degree table is a table of the relationship between the fourth EGR valve front pressure value, the second engine water temperature and the EGR valve opening degree.

[0049] Step S302: According to the EGR valve opening degree table, the fourth EGR valve front pressure value and the second engine water temperature, the EGR valve opening degree is determined, and the opening degree of the EGR valve is controlled to adjust to the EGR valve opening degree. After the first preset time period, the EGR valve is controlled to be closed.

[0050] The method monitors the second engine water temperature (i.e. the engine water temperature when the engine is off) after the vehicle is powered off, and when it exceeds a certain set value, intelligently controls the opening of the EGR valve according to the EGR valve opening table (a table data containing the relationship between the pre-EGR valve pressure, engine water temperature and EGR valve opening). The control strategy includes but is not limited to when the second engine water temperature is higher than the preset threshold, according to the actual pressure value before the EGR valve and the engine water temperature, looking up the EGR valve opening table to determine the appropriate EGR valve opening, then controlling the EGR valve to open and maintain for a period of time to release the residual pressure that may exist. This process not only ensures the rapid response of the EGR valve after the engine is off, but also effectively avoids the damage of the EGR valve mechanical parts caused by high temperature, prolonging the service life of the EGR valve. In this way, the system can still maintain the measurement accuracy and stability of the pre-EGR valve pressure sensor when the engine is in a high temperature state, solving the problem of sensor zero point deviation caused by the failure to release residual pressure after the engine is off in traditional methods, improving the overall performance of the EGR system and providing protection for the long-term stable operation of the engine and emission compliance.

[0051] More specifically, according to the above temperature data, the pre-EGR valve pressure value of the vehicle in the cold state and the hot state is determined, and the first pre-EGR valve pressure value and the second pre-EGR valve pressure value are obtained, as shown in Figure 4 The steps include:

[0052] Step S401: Determine the maximum difference between any two of the above temperature data among the above ambient temperature, the above first engine water temperature and the above engine aftertreatment temperature;

[0053] Step S402: If the maximum difference is less than the preset difference, determine that the vehicle is in the cold state, and determine the first pre-EGR valve pressure value;

[0054] Step S403: If the water temperature difference between the first engine water temperature and the ambient temperature is greater than the preset water temperature difference, determine that the vehicle is in the hot state, and determine the second pre-EGR valve pressure value.

[0055] Wherein, the preset difference and the preset water temperature difference are set according to the specific cold and hot judgment requirements, for example, the preset difference can be set to 10℃, and the preset water temperature difference can be set to 40℃.

[0056] The method adopts a temperature difference analysis method to intelligently judge the cold and hot states of the vehicle. By comparing the maximum difference of any two groups of temperature data between the ambient temperature, the first engine water temperature and the engine aftertreatment temperature, when the difference is lower than the preset cold state threshold, the system determines that the vehicle is in a cold state, and the collected EGR valve front pressure value is used as the first EGR valve front pressure value for subsequent cold state reference value determination. Conversely, 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 is used as the second EGR valve front pressure value for hot state reference value determination. This method not only accurately distinguishes the running state of the vehicle, but also adopts corresponding pressure value collection strategies according to different states, avoiding measurement errors caused by inaccurate state judgment, ensuring that the EGR valve front pressure sensor can obtain accurate reference values at the initial stage of vehicle start, solving the problem of unstable EGR system control in cold and hot states, and improving the running efficiency and emission performance of the engine.

[0057] Further, after obtaining the first EGR valve front pressure value and the second EGR valve front pressure value, the above method further comprises: obtaining an initial reference value of the vehicle, wherein the initial reference value is a reference value obtained in the last driving cycle of the vehicle; 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; and 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.

[0058] The method introduces a reference value validity verification mechanism. After each vehicle start, the system automatically calls the initial reference value recorded in the last driving cycle, and then compares and analyzes it with the first EGR valve front pressure value in the cold state and the second EGR valve front pressure value in the hot state. This verification mechanism not only prevents abnormal data caused by sensor failure or environmental mutation from being misused, but also ensures that each collected reference value reflects the true state of the EGR system, thereby improving the measurement accuracy and stability of the EGR valve front pressure sensor, solving the problem of EGR system control misalignment caused by invalid data, and ensuring the efficient operation and emission compliance of the engine under different working conditions.

[0059] Furthermore, comparing the first EGR valve inlet pressure value with the initial reference value yields a first comparison result. Determining whether the first EGR valve inlet pressure value is valid based on the first comparison result includes: determining that the first EGR valve inlet pressure value is valid if the absolute value of the first difference between the first EGR valve inlet pressure value and the initial reference value is within a preset difference range; comparing the second EGR valve inlet pressure value with the initial reference value yields a second comparison result. Determining whether the second EGR valve inlet pressure value is valid based on the second comparison result includes: determining that the second EGR valve inlet pressure value is valid if the absolute value of the second difference between the second EGR valve inlet pressure value and the initial reference value is within the preset difference range.

[0060] If the absolute value of the difference is not within the preset difference range, the collected EGR valve inlet pressure value is considered invalid.

[0061] Specifically, the system calculates the absolute value of the difference between the first EGR valve inlet pressure value and the initial reference value from the previous driving cycle. If this difference falls within a preset reasonable range, the first EGR valve inlet pressure value is considered valid; otherwise, it is considered invalid. Similarly, a similar absolute value difference judgment is performed on the second EGR valve inlet pressure value to confirm its validity. This judgment method is not only simple and easy to implement but also effectively eliminates abnormal fluctuations, ensuring that each reference value update is based on reliable data. This avoids EGR system control instability caused by data fluctuations, solves the problem of sensor measurements being interfered with by external factors, and provides strong support for precise engine control and emissions optimization.

[0062] Specifically, determining the EGR valve inlet pressure value of the aforementioned vehicle includes: collecting multiple initial EGR valve inlet pressure values ​​through the aforementioned EGR valve inlet pressure sensor within a second preset time period according to a preset time step, and determining the average value of the multiple initial EGR valve inlet pressure values ​​as the aforementioned EGR valve inlet pressure value.

[0063] The second preset time period can be set to 1 second, and the preset time step can be set to 0.01 seconds.

[0064] To further improve the measurement accuracy of the EGR valve pre-pressure value, the technical solution adopts a multiple sampling mean determination method. Within a second predetermined time period after the vehicle starts, the system will continuously collect multiple initial EGR valve pre-pressure values through the EGR valve pre-pressure sensor at predetermined time intervals (e.g., collecting data every few seconds). Then, the final EGR valve pre-pressure value is obtained by calculating the average of these pressure values. This method not only effectively filters out accidental noise interference, but also reflects the real pressure change trend of the EGR system in a short time, ensuring the stability and reliability of the pressure value. Through multiple sampling mean determination, the system can more accurately capture the small changes in the EGR valve pre-pressure, solving the problem of random error caused by single measurement, and providing more accurate data support for precise engine control and emission compliance.

[0065] In addition, the embodiment also includes a dynamic temperature difference compensation mechanism. Based on the multi-scenario self-learning value fusion mechanism, a dynamic temperature difference compensation mechanism is introduced to automatically adjust the weight factor of the self-learning value according to the temperature difference changes of different parts (such as cylinder, exhaust manifold, coolant) before and after the engine stops. Specifically, after the ECU detects that the engine has stopped, it will continuously record the temperature of each key part until it reaches a predetermined threshold (e.g., drops to ambient temperature ±10℃). At this time, according to the recorded temperature difference data, the ECU will calculate the corresponding compensation coefficient through a pre-set algorithm, which is used to adjust the weight of the cold start, hot start and pressure release self-learning value.

[0066] Suppose at a certain time point after the engine stops, the ECU detects that the water temperature has dropped from 90℃ to 75℃, and the ambient temperature is 25℃. The ECU will look up the pre-marked compensation coefficient table according to the temperature difference (50℃) between 75℃ and 25℃, and obtain the corresponding compensation coefficient (e.g., coefficient is 1.2). Then, when calculating the final deviation value P, the compensation coefficient will be applied to the self-learning value P2 in the corresponding scenario. This mechanism can more accurately reflect the influence of temperature change on residual pressure, ensuring that the self-learning value is closer to the actual working condition.

[0067] The dynamic temperature difference compensation mechanism makes the self-learning process of the EGR valve pre-pressure sensor no longer subject to static conditions, and can dynamically adjust to adapt to the transition from hot engine to cold engine, significantly improving the accuracy of self-learning. In addition, this feature enhances the flexibility and robustness of the system, ensuring the accuracy and consistency of sensor zero-point calibration even under extreme temperature fluctuations.

[0068] The embodiment also includes an ambient pressure fluctuation compensation function, considering the diversity of vehicle operating environments, fluctuations in ambient atmospheric pressure can also affect the zero point diagnosis of the EGR valve front pressure sensor. Therefore, the embodiment adds an ambient pressure fluctuation compensation function in the ECU. This function continuously monitors the trend of ambient pressure changes, and when it detects that the ambient pressure fluctuation exceeds a preset threshold (for example, ±10 hPa), the ECU will automatically adjust the baseline of the self-learning values P1 / P2 / P3 to offset the effects of ambient pressure changes.

[0069] For example: After driving in highland areas, the vehicle enters the plain area, due to the decrease of altitude, the ambient pressure may increase from 750 hPa to 1000 hPa. At this time, the ECU not only performs the normal EGR valve front pressure release and self-learning program, but also considers the change of ambient pressure. If the ECU detects that the ambient pressure has increased by 250 hPa, when calculating the self-learning values P1 / P2 / P3, the ECU will automatically subtract 250 hPa from each value (or the corresponding correction value obtained according to the current water temperature), to ensure that the zero point diagnosis of the pressure sensor is not affected even in the case of large changes in ambient pressure.

[0070] The ambient pressure fluctuation compensation function effectively solves the potential interference of external atmospheric pressure changes on sensor zero point diagnosis, ensuring the reliability and accuracy of the EGR system in different geographical environments. This is particularly important for large vehicles that need to operate in variable environmental conditions, preventing sensor reading deviations caused by changes in ambient pressure, thereby maintaining the consistency of EGR flow control, reducing emissions and improving overall engine performance.

[0071] In order to enable those skilled in the art to more clearly understand the technical solutions of the present application, the implementation process of the reference value determination method of the EGR valve front pressure sensor of the present application will be described in detail below in conjunction with specific embodiments.

[0072] The present embodiment relates to a specific reference value determination method for an EGR valve front pressure sensor, as shown in Figure 5 The present embodiment relates to a specific reference value determination method for an EGR valve front pressure sensor, as shown in

[0073] In the case of vehicle power-on without starting, determine whether the vehicle is cold-starting according to the ambient temperature, engine water temperature and aftertreatment temperature, wherein the definition of cold-starting is that the maximum temperature of the three temperatures of ambient temperature, water temperature and aftertreatment temperature is within a certain range (which can be calibrated according to the test, for example, 10°C) from the minimum temperature, and it is considered to be cold-starting. In the case of cold-starting, the EGRP sensor deviation is judged, and the self-learning record P1 value is recorded. The self-learning P1 value is compared with the P value stored in the last driving cycle to judge the deviation, and if it is within the range, it is weighted (weight factor fac1);

[0074] In the hot state, according to the temperature difference of water temperature exceeding ambient temperature / shutdown time, the opening degree and duration of driving the EGR valve are obtained by table lookup, and the EGRP sensor zero point deviation is judged, and the P2 value is recorded by self-learning, the P2 value of self-learning and the P value stored in the last driving cycle are judged, and the deviation is weighted (weight factor fac2) within the range; wherein the hot state: the engine water temperature exceeds the ambient temperature by a certain range (which can be calibrated according to the test, for example 40℃) above that the hot state is completed.

[0075] Among them, the general opening duration is controlled according to the time from ECU power-off to stop working, generally 3-5s, for example, according to the ECU power-off time requirement, 3s is selected;

[0076] The opening degree of driving the EGR valve is obtained by table lookup, and the opening degree of driving the EGR valve is obtained by table lookup in the ECU according to the pressure before the EGR valve and the engine water temperature, as shown in table 1; The table in the ECU is obtained by test, and the opening degree of EGR valve is adjusted under different engine water temperature and EGR valve front pressure, to ensure that the pressure before EGR valve is reduced to the final stable pressure within 3s.

[0077] Table 1

[0078]

[0079] In the vehicle power-off state, after the vehicle speed reaches 0, if the engine water temperature is greater than 60℃, the EGR valve is actively driven to open a certain opening degree and time, as shown in table 1, the EGRP sensor zero point deviation is judged, and the P3 value is recorded by self-learning, according to the current P3 and the P1 and P2 stored when the vehicle is powered on, the P value of the current driving cycle is obtained by weighted sum, and the P value is stored.

[0080] Specifically, in the vehicle power-off state, after the engine stops, the ECU actively drives the EGR valve to open for a short time (such as opening to 10%-20% opening), and the pressure difference between the EGR system and the intake manifold is used to guide the residual exhaust gas in the valve cavity to the engine through the EGR pipeline, so that the pressure in the cavity is balanced with the ambient pressure quickly. The opening time is optimized by calibration test (for example 3-5 seconds), to ensure the pressure release.

[0081] The influence of thermal expansion in hot state: the air in the cavity is affected by thermal radiation in the state of just stopping, and the pressure will be higher than that measured in the cold state.

[0082] Multi-scenario self-learning value fusion mechanism: self-learning and judgment of the power-on and power-off states are performed in each driving cycle, the power-on state learns different values according to the hot state and the cold state, and when powered off, in order to avoid the existence of residual exhaust gas in the closed cavity, the EGR valve is actively driven to release pressure, and then self-learning is performed. The learned values under the above three states are used for weighted fusion of data, and the weighting factors can be calibrated. Generally, the weight fac1 of the cold start state is the largest, the fac2 and fac3 learned in the hot state are weighted according to the temperature of the EGR cold temperature, and the weight gradually increases from high temperature to low temperature.

[0083] According to the formula: P=(P1×fac1+ P2×fac2+ P3×fac3) / (fac1+fac2+fac3), the P value is determined as the reference point of the EGRP sensor, and fac1, fac2 and fac3 are the corresponding weight factors. Among them, the ECU measures the original voltage signal of the EGRP sensor and converts it into a pressure signal, and the difference with the environmental pressure is taken, and the average value of a certain number of times (for example, 20 times for 0.01s) is recorded as P1, P2 and P3.

[0084] The embodiment breaks through the limitation of traditional static diagnosis, actively drives the EGR valve to open after the engine is turned off through the ECU, forcibly discharges the residual pressure, and provides a real zero point calibration environment for the sensor. Multi-condition cooperative intelligent trigger logic: combined with temperature, time, pressure stability and other multi-dimensional parameters, to avoid misdiagnosis caused by engine hot state or environmental interference. Self-learning fault tolerance mechanism: introduce multi-scenario self-learning value, data fusion, improve zero point robustness, and reduce the influence of occasional interference.

[0085] The embodiment of the application also provides an EGR valve front pressure sensor reference value determination device. It should be noted that the EGR valve front pressure sensor reference value determination device of the embodiment of the application can be used to execute the EGR valve front pressure sensor reference value determination method provided by the embodiment of the application. The device is used to realize the above-mentioned embodiments and preferred embodiments, which have been described. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the device described in the following embodiments is preferably realized in software, hardware or a combination of software and hardware is also possible and is conceived.

[0086] The EGR valve front pressure sensor reference value determination device provided by the embodiment of the application is introduced below.

[0087] Figure 6 is a schematic diagram of the EGR valve front pressure sensor reference value determination device according to the embodiment of the application. As Figure 6 shown, the device comprises:

[0088] The first determining unit 61 is configured to acquire temperature data in real time when the vehicle is powered on, and determine 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, wherein the temperature data includes an ambient temperature, a first engine water temperature and an engine aftertreatment temperature, and the EGR valve front pressure value is collected by an EGR valve front pressure sensor;

[0089] The second determining unit 62 is configured to acquire a second engine water temperature when the vehicle is powered off, control the EGR valve to be opened for a first preset time period and then closed according to at least the second engine water temperature, and determine a third EGR valve front pressure value of the vehicle after the EGR valve is closed.

[0090] The third determining unit 63 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, wherein the reference value is used to evaluate the measurement accuracy of the EGR valve front pressure sensor.

[0091] In the embodiment, the first determining unit is configured to acquire temperature data in real time when it is detected that the vehicle is powered on, and determine EGR valve front pressure values of the vehicle in cold state and 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 ambient temperature, first engine water temperature and engine aftertreatment temperature, and the EGR valve front pressure values are obtained by an EGR valve front pressure sensor; the second determining unit is configured to acquire a second engine water temperature when it is detected that the vehicle is powered off, control the EGR valve to be opened for a first preset time period and then closed according to at least the second engine water temperature, and determine a third EGR valve front pressure value of the vehicle after the EGR valve is closed; and the 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, wherein the reference value is used to evaluate the measurement accuracy of the EGR valve front pressure sensor. By dynamically monitoring the temperature state of the vehicle, intelligently distinguishing the cold state and the hot state, and then respectively acquiring the pressure values before the EGR valve, the change characteristics of the EGR valve front pressure under different working conditions can be accurately captured, which provides key data support for subsequent reference value determination. After the vehicle is powered off, the EGR valve is controlled to be opened for a certain time and then closed to eliminate the influence of possible residual pressure, and then the third EGR valve front pressure value represents a more pure zero pressure state. Finally, by comprehensively analyzing the three pressure values, the reference value of the EGR valve front pressure sensor is determined. 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, solves the problem of sensor zero drift caused by temperature change, residual pressure and other factors in the traditional method, optimizes the engine performance and emission control, and solves the problem that the pressure value detected by the EGR valve front pressure sensor in the prior art is inaccurate, which leads to inaccurate EGR flow calculation, thereby affecting the control of the EGR valve, causing the engine emission to exceed the standard and the performance to decrease.

[0092] As an optional solution, 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 take the pressure deviation value as the reference value of the EGR valve front pressure sensor.

[0093] An optional solution, the second determining unit comprises a first obtaining module and a control module; the first obtaining module is used to obtain a fourth EGR valve front pressure value and an EGR valve opening degree table when the second engine water temperature is greater than the water temperature setting value, wherein the EGR valve opening degree table is a table of the relationship between the fourth EGR valve front pressure value, the second engine water temperature and the EGR valve opening degree; the control module is used to determine 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, and control the opening degree of the EGR valve to be adjusted to the EGR valve opening degree, and control the EGR valve to be closed after the first preset time period.

[0094] An optional solution, the first determining unit comprises a first determining module, a second determining module and a third determining module; the first determining module is used to determine the maximum difference between any two of the temperature data among the ambient temperature, the first engine water temperature and the engine aftertreatment temperature; the second determining module is used to determine that the vehicle is in the cold state and determine the first EGR valve front pressure value when the maximum difference is less than a preset difference value; the third determining module is used to determine that the vehicle is in the hot state and determine the second EGR valve front pressure value when the water temperature difference between the first engine water temperature and the ambient temperature is greater than a preset water temperature difference value.

[0095] An optional solution, the device further comprises an obtaining unit and a comparison unit; the obtaining unit is used to obtain an initial reference value of the vehicle after obtaining the first EGR valve front pressure value and the second EGR valve front pressure value, wherein the initial reference value is a reference value obtained in the last driving cycle of the vehicle; the comparison unit is used to compare the first EGR valve front pressure value with the initial reference value to obtain a first comparison result, determine whether the first EGR valve front pressure value is valid according to the first comparison result, and compare the second EGR valve front pressure value with the initial reference value to obtain a second comparison result, and determine whether the second EGR valve front pressure value is valid according to the second comparison result.

[0096] An optional solution, the comparison unit comprises a fourth determining module and a fifth determining module; the fourth determining module is used to determine that the first EGR valve front pressure value is valid when the first difference absolute value between the first EGR valve front pressure value and the initial reference value is within a preset difference value range; the fifth determining module is used to determine that the second EGR valve front pressure value is valid when the second difference absolute value between the second EGR valve front pressure value and the initial reference value is within the preset difference value range.

[0097] An optional solution, the device further comprises a fourth determining unit configured to collect a plurality of initial EGR valve front pressure values from the EGR valve front pressure sensor according to a preset time step within a second preset time period, and determine an average of the plurality of initial EGR valve front pressure values as the EGR valve front pressure value.

[0098] The reference value determining device of the EGR valve front pressure sensor comprises a processor and a memory, the first determining unit, the second determining unit and the third determining unit are all stored in the memory as program units, and the corresponding functions are realized by the processor executing the program units stored in the memory.

[0099] The processor comprises a core, and the core retrieves the corresponding program units from the memory. The core can be one or more, and the problem of inaccurate EGR valve front pressure sensor detection in the prior art can be solved by adjusting the core parameters, so as to cause inaccurate EGR flow calculation, thereby affecting the control of the EGR valve, causing the engine emission to exceed the standard and the performance to decrease.

[0100] The memory can include a non-permanent memory in a computer readable medium, a random access memory (RAM) and / or a non-volatile memory such as a read-only memory (ROM) or a flash memory (flash RAM), and the memory comprises at least one memory chip.

[0101] The embodiment of the present application provides a computer readable storage medium, and the computer readable storage medium comprises a stored program, wherein the computer readable storage medium controls a device where the computer readable storage medium is located to execute the reference value determining method of the EGR valve front pressure sensor when the program runs.

[0102] Specifically, the reference value determining method of the EGR valve front pressure sensor comprises:

[0103] In step S201, when it is detected that the vehicle is powered on, temperature data is acquired in real time, and the EGR valve front pressure values of the vehicle in a cold state and a hot state are determined 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 comprises an ambient temperature, a first engine water temperature and an engine aftertreatment temperature.

[0104] In step S202, when it is detected that the vehicle is powered off, a second engine water temperature is acquired, the EGR valve is controlled to be opened for a first preset time period and then closed according to at least the second engine water temperature, and a third EGR valve front pressure value of the vehicle is determined after the EGR valve is closed.

[0105] 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 to evaluate the measurement accuracy of the EGR valve front pressure sensor.

[0106] Embodiments of the present application provide a processor for running a program, wherein the processor implements the method for determining the reference value of the EGR valve front pressure sensor when running the program.

[0107] Specifically, the method for determining the reference value of the EGR valve front pressure sensor comprises:

[0108] Step S201, in the case of detecting that the vehicle is powered on, acquiring temperature data in real time, and determining the EGR valve front pressure values of the vehicle in the cold state and the hot state according to the temperature data, to obtain the first EGR valve front pressure value and the second EGR valve front pressure value, wherein the temperature data comprises the ambient temperature, the first engine water temperature and the engine aftertreatment temperature;

[0109] Step S202, in the case of detecting that the vehicle is powered off, acquiring the second engine water temperature, controlling the EGR valve to be opened for a first preset time period and then closed according to at least the second engine water temperature, and determining the third EGR valve front pressure value of the vehicle after the EGR valve is closed;

[0110] 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 to evaluate the measurement accuracy of the EGR valve front pressure sensor.

[0111] Embodiments of the present application provide an electronic device, comprising a processor, a memory and a program stored in the memory and capable of running on the processor, and the processor implements at least the following steps when running the program:

[0112] Step S201, in the case of detecting that the vehicle is powered on, acquiring temperature data in real time, and determining the EGR valve front pressure values of the vehicle in the cold state and the hot state according to the temperature data, to obtain the first EGR valve front pressure value and the second EGR valve front pressure value, wherein the temperature data comprises the ambient temperature, the first engine water temperature and the engine aftertreatment temperature;

[0113] Step S202, in the case of detecting that the vehicle is powered off, acquiring the second engine water temperature, controlling the EGR valve to be opened for a first preset time period and then closed according to at least the second engine water temperature, and determining the third EGR valve front pressure value of the vehicle after the EGR valve is closed;

[0114] 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 to evaluate the measurement accuracy of the EGR valve front pressure sensor.

[0115] The device herein can be a server, a PC, a PAD, a mobile phone, etc.

[0116] The application also provides a computer program product, which, when executed on a data processing device, is adapted to execute a program that has at least the following method steps:

[0117] Step S201, in the case of detecting that the vehicle is powered on, acquiring temperature data in real time, and determining EGR valve front pressure values of the vehicle in cold state and 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 ambient temperature, first engine water temperature and engine aftertreatment temperature;

[0118] Step S202, in the case of detecting that the vehicle is powered off, acquiring a second engine water temperature, and controlling the EGR valve to be opened for a first preset time period and then 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;

[0119] 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 to evaluate the measurement accuracy of the EGR valve front pressure sensor.

[0120] Obviously, those skilled in the art should understand that the modules or steps of the application described above can be realized by general computing devices, which can be concentrated on a single computing device or distributed on a network composed of multiple computing devices, and they can be realized by program codes executable by computing devices, so that they can be stored in storage devices and executed by computing devices, and in some cases, the steps shown or described herein can be executed in different order, or they can be respectively manufactured into individual integrated circuit modules, or multiple modules or steps among them can be manufactured into a single integrated circuit module. Thus, the application is not limited to any specific combination of hardware and software.

[0121] Those skilled in the art will appreciate that embodiments of the application can be readily used as software, hardware, or a combination of software and hardware. In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0122] The computer program instructions can 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 block or blocks. Figure 1 one or more functions specified in the flowchart block or blocks. Figure 1 means for functionally implementing one or more functions specified in the flowchart block or blocks.

[0123] These computer program instructions can 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 instructions which implement the function specified in the flowchart block or blocks. Figure 1 one or more functions specified in the flowchart block or blocks. Figure 1 means for functionally implementing one or more functions specified in the flowchart block or blocks.

[0124] The computer program instructions can 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 block or blocks. Figure 1 one or more functions specified in the flowchart block or blocks. Figure 1 means for functionally implementing one or more functions specified in the flowchart block or blocks.

[0125] In one typical configuration, the computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0126] The memory can include non-persistent memory and / or volatile memory, such as a random access memory (RAM) including a cache area for the temporary storage of data. The memory can also include non-volatile memory, such as read only memory (ROM) for storing structural information and / or instruction code. Both can be within one or more memory devices 1225. Alternatively, some memory devices can provide a combination of one or more of the foregoing types of memories. Since memory is a computer-readable medium, it can also include a combination of one or more non- volatile memory and / or volatile memory, such as a persistent memory.

[0127] Computer-readable media includes permanent and non-permanent, movable and non-movable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media 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 technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer-readable media does not include transitory media such as modulated data signals and carriers.

[0128] The technical features of the above-described embodiments can be combined in any manner. In order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not contradict each other, they should be considered within the scope of the present disclosure.

[0129] It should also be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusions, so that processes, methods, articles or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0130] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of determining a reference value of an EGR valve front pressure sensor, characterized by, The method comprises: In the case of detecting the power-on of the vehicle, real-time temperature data is acquired, and the EGR valve front pressure values of the vehicle in cold state and hot state are determined according to the temperature data, to obtain first EGR valve front pressure value and second EGR valve front pressure value, wherein the temperature data comprises ambient temperature, first engine water temperature and engine aftertreatment temperature; In the case of detecting the power-off of the vehicle, the second engine water temperature is acquired, and the EGR valve is controlled to open for a first preset time period and then close according to at least the second engine water temperature, and after the EGR valve is closed, the third EGR valve front pressure value of the vehicle is determined; The reference value of the EGR valve front pressure sensor is determined 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 the measurement accuracy of the EGR valve front pressure sensor.

2. The method of claim 1, wherein, The reference point of the EGR valve front pressure sensor is determined according to the first EGR valve front pressure value, the second EGR valve front pressure value and the third EGR valve front pressure value, comprising: The first EGR valve front pressure value, the second EGR valve front pressure value and the third EGR valve front pressure are weighted and averaged to obtain a pressure deviation value, and the pressure deviation value is taken as the reference value of the EGR valve front pressure sensor.

3. The method of claim 1, wherein, The EGR valve is controlled to open for a first preset time period and then close according to at least the second engine water temperature, comprising: In the case that the second engine water temperature is greater than the water temperature setting value, the fourth EGR valve front pressure value and the EGR valve opening degree table are acquired, wherein the EGR valve opening degree table is a relationship table of the fourth EGR valve front pressure value, the second engine water temperature and the EGR valve opening degree; The EGR valve opening degree is determined according to the EGR valve opening degree table, the fourth EGR valve front pressure value and the second engine water temperature, and the opening degree of the EGR valve is adjusted to the EGR valve opening degree, and after the first preset time period, the EGR valve is controlled to close.

4. The method of claim 1, wherein, The EGR valve front pressure values of the vehicle in cold state and hot state are determined according to the temperature data, to obtain first EGR valve front pressure value and second EGR valve front pressure value, comprising: The maximum difference between any two of the temperature data among the ambient temperature, the first engine water temperature and the engine aftertreatment temperature is determined; In the case that the maximum difference is less than a preset difference value, the vehicle is determined to be in the cold state, and the first EGR valve front pressure value is determined; In the case that the water temperature difference between the first engine water temperature and the ambient temperature is greater than a preset water temperature difference value, the vehicle is determined to be in the hot state, and the second EGR valve front pressure value is determined.

5. The method of claim 1, wherein, After obtaining the first EGR valve front pressure value and the second EGR valve front pressure value, the method further comprises: An initial reference value of the vehicle is acquired, wherein the initial reference value is a reference value obtained in the last driving cycle of the vehicle; The first EGR valve front pressure value and the initial reference value are compared to obtain a first comparison result, and whether the first EGR valve front pressure value is valid is determined according to the first comparison result; the second EGR valve front pressure value and the initial reference value are compared to obtain a second comparison result, and whether the second EGR valve front pressure value is valid is determined according to the second comparison result.

6. The method of claim 5, wherein, The first EGR valve front pressure value and the initial reference value are compared to obtain a first comparison result, and whether the first EGR valve front pressure value is valid is determined according to the first comparison result, including: in a case where an absolute value of a first difference between the first EGR valve front pressure value and the initial reference value is within a preset difference range, determining that the first EGR valve front pressure value is valid; The second EGR valve front pressure value and the initial reference value are compared to obtain a second comparison result, and whether the second EGR valve front pressure value is valid is determined according to the second comparison result, including: in a case where an absolute value of a second difference between the second EGR valve front pressure value and the initial reference value is within the preset difference range, determining that the second EGR valve front pressure value is valid.

7. The method of claim 1, wherein, The EGR valve front pressure value of the vehicle is determined, including: A plurality of initial EGR valve front pressure values are collected by the EGR valve front pressure sensor in a second preset time period according to a preset time step, and an average value of the plurality of initial EGR valve front pressure values is determined as the EGR valve front pressure value.

8. An apparatus for determining a reference value of an EGR valve front pressure sensor, characterized by comprising: Including: The first determination unit is configured to, in a case where it is detected that the vehicle is powered on, acquire temperature data in real time, and determine EGR valve front pressure values of the vehicle in a cold vehicle state and a hot vehicle 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 aftertreatment temperature, and the EGR valve front pressure values are collected by an EGR valve front pressure sensor; The second determination unit is configured to, in a case where it is detected that the vehicle is powered off, acquire a second engine water temperature, control an EGR valve to be opened for a first preset time period and then closed according to at least the second engine water temperature, and determine a third EGR valve front pressure value of the vehicle after the EGR valve is closed; The third determination 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, wherein the reference value is used to evaluate a 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 when the program runs, the device where the computer readable storage medium is located performs the reference value determination method of the EGR valve front pressure sensor in any one of claims 1 to 7.

10. An electronic device, comprising: 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 programs for executing the reference value determination method of the EGR valve front pressure sensor according to any one of claims 1 to 7.

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