CN116337328A - Reliability detection method and device for upstream pressure sensor of EGR (exhaust gas Recirculation) system and vehicle - Google Patents

Abstract

The invention discloses a reliability detection method and device for an upstream pressure sensor of an EGR system and a vehicle, wherein the method comprises the following steps: acquiring the working condition of an EGR system; when the working condition of the EGR system accords with the preset working condition, acquiring the upstream temperature of the venturi, the pressure difference of the venturi and the flow of an EGR valve model; determining an upstream pressure model value of the EGR valve based on the EGR model flow, the venturi upstream temperature, the venturi differential pressure, and the first pressure model; acquiring an actual upstream pressure value of the EGR valve based on an upstream pressure sensor of the EGR valve; judging whether a first difference value between the actual upstream pressure value and the model upstream pressure value is included in a trusted interval; and determining that the EGR valve upstream pressure sensor has a fault when the first difference is not included in the trusted interval. When the detection accuracy of the upstream pressure sensor is judged by utilizing the upstream pressure model value, the reliability degree of the upstream pressure model value is required to be higher, namely, the working condition of the EGR system accords with the preset working condition, and whether the upstream pressure sensor fails or not is judged by the first difference value, so that the data detection accuracy of the EGR system is improved.

Description

Plausibility detection method, device and vehicle for upstream pressure sensor of EGR system

technical field

The invention relates to the technical field of vehicle detection, in particular to a reliability detection method, device and vehicle of an upstream pressure sensor of an EGR system.

Background technique

my country is a big country of automobiles. With the improvement of people's living standards, more and more attention has been paid to the emission of automobiles.

The EGR system works by returning part of the exhaust gas from the engine to the intake manifold, where it re-enters the cylinders together with the fresh mixture. Because the exhaust gas contains a large amount of _CO2 and other polyatomic gases, _CO2 and other gases cannot be burned but absorb a large amount of heat due to their high specific heat capacity, which reduces the maximum combustion temperature of the mixture in the cylinder, thereby reducing the amount of NOx produced. Therefore, when the EGR system is working, the detection accuracy of the working parts in the system, such as the upstream pressure sensor and downstream pressure sensor of the EGR valve, needs to be accurate. For the working parts that have failed, they need to be found and repaired or replaced in time to avoid detection If the deviation is too large, the emission will increase, which does not meet the requirements of the national standard.

An existing fault detection scheme for the upstream pressure sensor of the EGR system is to detect the fault when the car is in the flameout state. This scheme can only detect the detection accuracy of the upstream pressure sensor corresponding to the position of 0 o'clock, and cannot determine the upstream pressure sensor. Whether the slope of the characteristic curve drifts, so even if the scheme is used to determine that the upstream pressure sensor is not faulty, the detection accuracy of the upstream pressure sensor will still be poor when tested under other working conditions.

Therefore, the technical problem of how to improve the reliability detection accuracy of the upstream pressure sensor of the EGR valve needs to be solved urgently.

Contents of the invention

In order to solve the technical problem of how to detect the working conditions of the working parts of the EGR system described in the background art above. The invention provides a reliability detection method, device and vehicle of an upstream pressure sensor of an EGR system.

According to an aspect of an embodiment of the present application, a method for detecting the reliability of an upstream pressure sensor of an EGR system is provided, including: acquiring the working condition of the EGR system; when the working condition of the EGR system conforms to a preset working condition, acquiring Venturi upstream temperature, Venturi differential pressure, and EGR valve model flow; determining an upstream pressure model value for the EGR valve based on the EGR model flow, the Venturi upstream temperature, the Venturi differential pressure, and a first pressure model; based on The upstream pressure sensor of the EGR valve obtains the measured value of the upstream pressure of the EGR valve; it is judged whether the first difference between the measured value of the upstream pressure and the model value of the upstream pressure is included in the credible interval; if the first difference is not included in the When the confidence interval is reached, it is determined that the pressure sensor upstream of the EGR valve has a fault.

Optionally, the working condition of the EGR system conforming to the preset working condition includes: acquiring a downstream pressure value of the EGR valve based on a downstream pressure sensor of the EGR valve; judging a second difference between the upstream pressure model value and the downstream pressure value Whether it is greater than a preset value; when the second difference is greater than the preset value, it is determined that the working condition of the EGR system conforms to the preset working condition.

Optionally, the determining the upstream pressure model value of the EGR valve based on the EGR model flow rate, the Venturi upstream temperature, the Venturi pressure difference and a first pressure model includes: obtaining a first flow rate model of the EGR valve; Determining the first pressure model based on the first flow model and the Venturi upstream temperature; determining based on the first pressure model, the EGR model flow, the Venturi upstream temperature and the Venturi differential pressure The upstream pressure model value.

Optionally, the method for determining the flow of the EGR valve model includes: obtaining the total intake flow, air flow and gas flow; determining the EGR valve model based on the total intake flow, the air flow and the gas flow flow.

Optionally, the obtaining the total amount of intake air includes: obtaining the intake manifold pressure value, engine speed and intake manifold temperature of the engine; based on the intake manifold pressure value, engine speed, intake manifold temperature and charging efficiency determine the total amount of intake air.

Optionally, the method for determining the upstream pressure model value further includes: obtaining the downstream pressure value, downstream temperature value, EGR model flow rate and EGR valve opening value of the EGR valve; based on the downstream pressure value, downstream temperature value, EGR Model flow, EGR valve opening value and correction parameters determine the upstream pressure model value.

Optionally, the determining the upstream pressure model value based on the downstream pressure value, downstream temperature value, EGR model flow rate, EGR valve opening value and correction parameters includes: based on the downstream pressure value, downstream temperature value, EGR Determine the second flow model of the EGR valve based on the model flow, the EGR valve opening value and the correction parameters; determine the second pressure model based on the second flow model; determine the second pressure model based on the second pressure model, the downstream pressure value, the downstream The temperature value, the EGR model flow rate, the EGR valve opening value and the correction parameter determine the upstream pressure model value.

Optionally, the method for determining the upstream pressure model value further includes: obtaining the pre-swirl pressure value, the pre-swirl temperature value and the EGR model flow rate of the turbine; The temperature value and the EGR model flow determine the upstream pressure model value.

According to still another aspect of the embodiment of the present application, there is also provided a reliability detection device for an upstream pressure sensor of an EGR system, including: a first acquisition module, which acquires the working condition of the EGR system; a second acquisition module, which is configured in the When the working condition of the EGR system conforms to the preset working condition, the Venturi upstream temperature, the Venturi pressure difference and the EGR valve model flow are obtained; the first analysis module is based on the EGR model flow, the Venturi upstream temperature, the Venturi The pressure difference and the first pressure model determine the upstream pressure model value of the EGR valve; the third acquisition module obtains the measured value of the upstream pressure of the EGR valve based on the upstream pressure sensor of the EGR valve; the second analysis module judges that the measured value of the upstream pressure is consistent with the Whether the first difference of the upstream pressure model value is included in the credible interval; the third analysis module, when the first difference is not included in the credible interval, determines that there is a fault in the EGR valve upstream pressure sensor.

According to still another aspect of the embodiments of the present application, there is also provided a vehicle, including a controller, the controller is configured to execute the method for detecting the reliability of the upstream pressure sensor of the EGR system described in any one of the above embodiments.

In this application, when using the upstream pressure model value to judge the detection accuracy of the upstream pressure sensor, it is necessary to ensure that the upstream pressure model value has a high degree of credibility, that is, the working condition of the EGR system conforms to the preset working condition, and through the requirements of the working condition, Accurate the upstream pressure model value of the EGR valve, and then use the first difference to judge whether the upstream pressure sensor is faulty. The deviation of the pressure model value is too large, that is, the detection accuracy of the upstream pressure sensor is low. At this time, it is determined that the upstream pressure sensor is faulty. After the fault is determined, the driver can detect the abnormal situation and follow-up Maintenance by maintenance personnel improves the working condition range that allows the reliability detection of the upstream pressure sensor, thereby improving the calculation accuracy of relevant parameters in the EGR system such as EGR rate, EGR valve opening and other parameters, and improving the accuracy of EGR system data detection and control. accuracy.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, In other words, other drawings can also be obtained from these drawings without paying creative labor.

Fig. 1 is a schematic flow chart of an optional method for detecting the reliability of an upstream pressure sensor of an EGR system according to an embodiment of the present application;

Fig. 2 is a structural block diagram of an optional device for detecting the reliability of an upstream pressure sensor of an EGR system according to an embodiment of the present application.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

As described in the background technology, an existing fault detection scheme for the upstream pressure sensor of the EGR system is to detect the fault when the car is in the flameout state. This scheme can only detect the detection accuracy of the upstream pressure sensor corresponding to the position of 0 o’clock. It is not possible to determine whether the slope of the characteristic curve of the upstream pressure sensor drifts, so even if the upstream pressure sensor is determined to be free of faults using this solution, the detection accuracy of the upstream pressure sensor will still be poor when tested under other working conditions.

Therefore, according to an aspect of the embodiment of the present application, a method for detecting the reliability of the upstream pressure sensor of the EGR system is provided. Referring to FIG. 1 , the flow of the method may include the following steps:

S10. Obtain the working condition of the EGR system.

S20. When the working condition of the EGR system conforms to the preset working condition, acquire the temperature upstream of the Venturi, the differential pressure of the Venturi and the flow rate of the EGR valve model.

S30. Determine an upstream pressure model value of the EGR valve based on the EGR model flow rate, the Venturi upstream temperature, the Venturi pressure difference and a first pressure model.

S40. Obtain an actual measured value of the upstream pressure of the EGR valve based on the upstream pressure sensor of the EGR valve.

S50. Determine whether the first difference between the measured value of the upstream pressure and the model value of the upstream pressure is included in a credible interval.

S60. When the first difference is not included in the credible interval, determine that there is a fault in the pressure sensor upstream of the EGR valve.

In the embodiment of the present application, when using the upstream pressure model value to judge the detection accuracy of the upstream pressure sensor, it is necessary to ensure that the reliability of the upstream pressure model value is relatively high, that is, the working condition of the EGR system conforms to the preset working condition. According to the requirements, the upstream pressure model value of the EGR valve is accurate, and then the first difference is used to judge whether the upstream pressure sensor is faulty. When the first difference is not included in the credible interval, it represents the actual upstream pressure detected by the upstream pressure sensor at this time The deviation between the value and the upstream pressure model value is too large, that is, the detection accuracy of the upstream pressure sensor is low. At this time, it is determined that the upstream pressure sensor is faulty. After the fault is determined, the driver can detect the abnormality by alarming and recording the fault code. The situation and subsequent maintenance by maintenance personnel have improved the range of working conditions that allow the reliability detection of the upstream pressure sensor, thereby improving the calculation accuracy of relevant parameters in the EGR system such as EGR rate, EGR valve opening and other parameters, and improving the data detection of the EGR system. and control accuracy.

As an exemplary embodiment, the working condition of the EGR system conforming to the preset working condition includes: obtaining the downstream pressure value of the EGR valve based on the downstream pressure sensor of the EGR valve; judging the upstream pressure model value and the downstream pressure value Whether the second difference is greater than a preset value; when the second difference is greater than the preset value, it is determined that the working condition of the EGR system conforms to the preset working condition.

In this embodiment, when using the first difference to judge whether the upstream pressure sensor is credible, that is, whether it is faulty, it is necessary to ensure the accuracy of the upstream pressure model value, which can be in the air flow sensor, front oxygen sensor, EGR differential pressure When the sensors have no faults, and the engine speed and the EGR valve opening are kept at a certain value, the calculation of the upstream pressure model value is carried out. Wherein, the fixed value corresponding to the engine speed and the fixed value corresponding to the EGR valve opening value can be determined through a bench test. By constraining the working conditions of the calculation of the upstream pressure model value, the accuracy of the reliability detection of the upstream pressure sensor can be further improved.

As an exemplary embodiment, the determining the upstream pressure model value of the EGR valve based on the EGR model flow rate, the Venturi upstream temperature, the Venturi pressure difference and the first pressure model includes: obtaining the first EGR valve flow model; determining said first pressure model based on said first flow model and said Venturi upstream temperature; based on said first pressure model, said EGR model flow, said Venturi upstream temperature and said Venturi The differential pressure determines the upstream pressure model value.

In this embodiment, in the EGR system with Venturi structure, the first flow model can be obtained through the corresponding conversion of the first flow model and the temperature upstream of the Venturi, as shown in the following formula (1) as the first flow Model:

Among them, β is the ratio of Venturi throat diameter to Venturi upstream position diameter, A _EGR is Venturi throat area, ε is compressibility coefficient, ρ ₁ is density of gas upstream of Venturi, p ₁ is gas upstream of Venturi The pressure value, p ₂ refers to the pressure of the venturi throat gas, k ₁ is a constant, Δp is the Venturi pressure difference. ρ ₁ can be obtained by combining p ₁ and T ₁ with the state equation, p ₂ refers to the pressure of the venturi throat gas, which can be calculated by p ₁ -Δp, k ₁ can be determined through experiments, and Δp is measured by the Venturi differential pressure sensor value, ε can be represented by β, p ₁ , p ₂ , see formula (2):

Among them, k is a thermodynamic constant, the above formulas (1)-(2) are converted, and combined with the state equation to convert _ρ1 into the form of P1 and T1, the first pressure model can be obtained, as shown in the following formula (3) :

Among them, ε _(t-1) is the value of ε at the previous moment, and k ₂ is a constant. Based on this, the EGR valve upstream pressure model value can be calculated from the EGR model flow rate, the Venturi upstream temperature and the Venturi pressure difference.

As an exemplary embodiment, the method for determining the flow rate of the EGR valve model includes: obtaining the total intake flow rate, air flow rate and gas flow rate; determining the EGR valve model flow. The obtaining the total amount of intake air includes: obtaining the intake manifold pressure value, engine speed and intake manifold temperature of the engine; determining the intake manifold pressure value, engine speed, intake manifold temperature and charging efficiency The total amount of intake air.

In this embodiment, the total amount of intake air can be calculated by the following formula (4):

Among them, mfTotal is the total amount of intake air, n is the engine speed, which can be directly read by the ECU, MAP is the intake manifold pressure of the engine, which can be detected by the intake manifold pressure sensor, and MAT is the intake manifold of the engine The temperature can be detected by the intake manifold temperature sensor, and k ₃ is the inflation efficiency, which can be calibrated in advance on the bench test.

After the total amount of intake air is determined, the EGR valve model flow can be calculated, as shown in the following formula (5):

mfEGR=mfTotal-mfAir-mfNG (5)

Among them, mfEGR is the flow rate of the EGR valve model, mfTotal is the total amount of intake air, mfAir is the air flow rate, which can be detected by the air flow meter, and mfNG is the gas flow rate, which can be calculated by the ECU by reading the fuel injection volume.

As an exemplary embodiment, the method for determining the upstream pressure model value further includes: acquiring a downstream pressure value, a downstream temperature value, an EGR model flow rate, and an EGR valve opening value of the EGR valve; value, EGR model flow rate, EGR valve opening value and correction parameters determine the upstream pressure model value. The determining the upstream pressure model value based on the downstream pressure value, downstream temperature value, EGR model flow rate, EGR valve opening value and correction parameters includes: based on the downstream pressure value, downstream temperature value, EGR model flow rate, EGR The valve opening value and the correction parameter determine the second flow model of the EGR valve; determine the second pressure model based on the second flow model; determine the second pressure model based on the second pressure model, the downstream pressure value, the downstream temperature value, the The upstream pressure model value is determined based on the EGR model flow rate, the EGR valve opening value and the correction parameter.

In this embodiment, for the EGR system without Venturi structure, it can be based on the map of the EGR valve model flow rate and the downstream pressure value of the EGR valve, the downstream temperature value, the EGR valve opening value and the upstream pressure model value of the EGR valve Carry out look-up table and determine, promptly see shown in following formula (6):

Among them, mf _egr is the EGR model flow rate, T ₃ is the downstream temperature value of the EGR valve, p ₃ is the downstream pressure value of the EGR valve, p ₁ is the upstream pressure model value of the EGR valve, M is the EGR valve opening value, f1, f2, f3 , f4 is the corresponding fixed relationship converted from the map and the flow rate of the EGR model, and f5 is the correction parameter, which can be obtained through experiments. Based on the map and formula (6), the upstream pressure model value of the EGR valve can be determined, and then the credibility of the upstream pressure sensor of the EGR valve can be tested when the working condition of the EGR system conforms to the preset working condition.

As an exemplary embodiment, the method for determining the value of the upstream pressure model further includes: obtaining the pre-swirl pressure value, the pre-swirl temperature value and the EGR model flow rate of the turbine; based on the third pressure model, the pre-swirl pressure value, the The pre-swirl temperature value and the EGR model flow rate determine the upstream pressure model value.

In this embodiment, the determination method of the upstream pressure model value can also be based on the pre-vortex pressure value of the turbine, the pre-vortex temperature value, and the EGR model flow rate, combined with the basic formula of fluid mechanics, that is, the third pressure model, see the following formula As shown in (7):

为基于EGR模型流量和涡前温度值的二维插值表，对应关系通过实验得到。Among them, P ₁ is the upstream pressure model value, P ₀ is the pre-vortex pressure value, mfEGR is the EGR model flow rate, T ₀ is the pre-vortex temperature value,

It is a two-dimensional interpolation table based on the EGR model flow rate and the temperature value before the vortex, and the corresponding relationship is obtained through experiments.

In this application, the corresponding pressure model can be selected based on different EGR systems and different parameters that can be obtained or calculated to calculate the value of the upstream pressure model, and the upstream pressure sensor can be adjusted when the working condition of the EGR system meets the preset working condition. The reliability detection increases the working condition range of the reliability detection of the upstream pressure sensor, and can more accurately detect whether the upstream pressure sensor fails.

According to another aspect of the embodiment of the present application, a reliability detection device for an upstream pressure sensor of an EGR system is provided, as shown in FIG. 2 , including:

The first acquiring module 201, acquires the working condition of the EGR system;

The second acquisition module 202, when the working condition of the EGR system conforms to the preset working condition, acquires the Venturi upstream temperature, the Venturi pressure difference and the EGR valve model flow rate;

The first analysis module 203, based on the EGR model flow rate, the Venturi upstream temperature, the Venturi pressure difference and the first pressure model to determine the upstream pressure model value of the EGR valve;

The third obtaining module 204, obtains the measured value of the upstream pressure of the EGR valve based on the upstream pressure sensor of the EGR valve;

The second analysis module 205, judges whether the first difference between the measured value of the upstream pressure and the model value of the upstream pressure is included in the credible interval;

The third analysis module 206 determines that the pressure sensor upstream of the EGR valve has a fault when the first difference is not included in the confidence interval.

It should be noted that the first acquisition module 201 in this embodiment can be used to perform the above step S10, the second acquisition module 202 in this embodiment can be used to perform the above step S20, the first analysis module in this embodiment 203 can be used to perform the above step S30, the third acquisition module 204 in this embodiment can be used to perform the above step S40, the second analysis module 205 in this embodiment can be used to perform the above step S50, in this embodiment The third analysis module 206 may be used to execute the above step S60.

According to still another aspect of the embodiments of the present application, there is also provided a vehicle, including a controller, the controller is configured to execute the method for detecting the reliability of the upstream pressure sensor of the EGR system described in any one of the above embodiments.

It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the described action sequence. Depending on the application, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by this application.

The above are only the preferred embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the principle of the application, and these improvements and modifications should also be considered as For the scope of protection of this application.

Claims (10)

1. A plausibility detection method of an EGR system upstream pressure sensor, characterized in that, comprising: Obtain the working condition of the EGR system; When the working condition of the EGR system conforms to the preset working condition, the Venturi upstream temperature, the Venturi pressure difference and the EGR valve model flow rate are obtained; determining an upstream pressure model value for an EGR valve based on the EGR model flow rate, the Venturi upstream temperature, the Venturi differential pressure, and a first pressure model; Acquiring the measured value of the upstream pressure of the EGR valve based on the upstream pressure sensor of the EGR valve; judging whether the first difference between the measured upstream pressure value and the upstream pressure model value is included in a credible interval; When the first difference is not included in the confidence interval, it is determined that the EGR valve upstream pressure sensor has a fault. 2. The method for detecting the reliability of the upstream pressure sensor of the EGR system according to claim 1, wherein the EGR system working condition conforming to the preset working condition comprises: Obtain the downstream pressure value of the EGR valve based on the downstream pressure sensor of the EGR valve; judging whether a second difference between the upstream pressure model value and the downstream pressure value is greater than a preset value; When the second difference is greater than the preset value, it is determined that the working condition of the EGR system complies with the preset working condition. 3. The plausibility detection method of EGR system upstream pressure sensor as claimed in claim 1, is characterized in that, described based on described EGR model flow rate, described Venturi upstream temperature, described Venturi differential pressure and first The pressure model determines the upstream pressure model values of the EGR valve including: obtaining a first flow model of the EGR valve; determining the first pressure model based on the first flow model and the Venturi upstream temperature; The upstream pressure model value is determined based on the first pressure model, the EGR model flow rate, the Venturi upstream temperature, and the Venturi differential pressure. 4. the plausibility detection method of EGR system upstream pressure sensor as claimed in claim 3, is characterized in that, the determining method of described EGR valve model flow comprises: Obtain the total intake air flow, air flow and gas flow; The EGR valve model flow is determined based on the intake total flow, the air flow, and the gas flow. 5. The authenticity detection method of the EGR system upstream pressure sensor as claimed in claim 4, is characterized in that, said obtaining intake air total amount comprises: Obtain the intake manifold pressure value, engine speed and intake manifold temperature of the engine; The intake air amount is determined based on the intake manifold pressure value, engine speed, intake manifold temperature and charging efficiency. 6. the plausibility detection method of EGR system upstream pressure sensor as claimed in claim 1, is characterized in that, the determination method of described upstream pressure model value also comprises: Obtain the downstream pressure value, downstream temperature value, EGR model flow rate and EGR valve opening value of the EGR valve; The upstream pressure model value is determined based on the downstream pressure value, downstream temperature value, EGR model flow rate, EGR valve opening value and correction parameters. 7. The authenticity detection method of the EGR system upstream pressure sensor as claimed in claim 6, is characterized in that, described based on described downstream pressure value, downstream temperature value, EGR model flow rate, EGR valve opening degree value and correction parameter Determining said upstream pressure model value includes: determining a second flow model of the EGR valve based on the downstream pressure value, downstream temperature value, EGR model flow rate, EGR valve opening value and correction parameters; determining a second pressure model based on the second flow model; The upstream pressure model value is determined based on the second pressure model, the downstream pressure value, the downstream temperature value, the EGR model flow rate, the EGR valve opening value, and the correction parameter. 8. The plausibility detection method of EGR system upstream pressure sensor as claimed in claim 1, is characterized in that, the determination method of described upstream pressure model value also comprises: Obtain the pre-vortex pressure value, pre-vortex temperature value and EGR model flow of the turbine; The upstream pressure model value is determined based on a third pressure model, the pre-swirl pressure value, the pre-swirl temperature value, and the EGR model flow rate. 9. A reliability detection device for an upstream pressure sensor of an EGR system, characterized in that it comprises: A first acquisition module, for acquiring the working condition of the EGR system; The second acquisition module, when the working condition of the EGR system conforms to the preset working condition, acquires the Venturi upstream temperature, the Venturi pressure difference and the EGR valve model flow rate; A first analysis module, based on the EGR model flow rate, the Venturi upstream temperature, the Venturi pressure difference and a first pressure model to determine the upstream pressure model value of the EGR valve; The third obtaining module obtains the measured value of the upstream pressure of the EGR valve based on the upstream pressure sensor of the EGR valve; The second analysis module judges whether the first difference between the measured value of the upstream pressure and the model value of the upstream pressure is included in the credible interval; A third analysis module, when the first difference is not included in the confidence interval, determines that there is a fault in the pressure sensor upstream of the EGR valve. 10. A vehicle, characterized by comprising a controller, the controller being used to execute the method for detecting the reliability of the upstream pressure sensor of the EGR system according to any one of claims 1-8.

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