EGR module pressure sensor detection method, device, vehicle and storage medium

Abstract

The present invention discloses a method, device, vehicle, and storage medium for detecting an EGR module pressure sensor. The method includes: obtaining the air flow rate before the throttle valve, the gas flow rate at the throat, and the exhaust gas recirculation flow rate at the intake manifold of the EGR module when the engine speed, speed-load change rate, and engine water temperature meet set conditions; determining a first stagnation pressure before the throttle valve, a second stagnation pressure at the throat, and a third stagnation pressure at the intake manifold based on the air flow rate, the gas flow rate, and the exhaust gas recirculation flow rate; and determining the state of the EGR module throat pressure sensor based on the first stagnation pressure, the second stagnation pressure, and the third stagnation pressure. The present invention achieves accurate detection of the EGR module throat pressure sensor and improves the reliability of detection of the EGR module throat pressure sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of EGR module detection, and in particular to an EGR module pressure sensor detection method, device, vehicle and storage medium. Background Art

[0002] Exhaust Gas Recirculation (EGR) is a system that returns a small portion of exhaust gas generated by diesel or gasoline engines to the cylinders. Currently, the EGR module's throat pressure sensor compares the pre-throttle pressure to determine if the throat pressure sensor is faulty. However, existing solutions fail to account for pressure fluctuations caused by changes in throat pipe diameter, leading to inaccurate monitoring of the throat pressure sensor and potential misjudgments or missed detections. Summary of the Invention

[0003] The present invention provides an EGR module pressure sensor detection method, device, vehicle and storage medium to solve the problem that the current EGR module throat pressure sensor lacks a credibility upper and lower limit diagnosis strategy.

[0004] According to one aspect of the present invention, a method for detecting an EGR module pressure sensor is provided, the method comprising:

[0005] When the engine speed, speed-load change rate, and engine water temperature meet the set conditions, the air flow before the throttle valve, the gas flow at the throat, and the exhaust gas recirculation flow at the intake manifold of the EGR module are obtained;

[0006] determining a first stagnation pressure before the throttle valve, a second stagnation pressure at the throat, and a third stagnation pressure at the intake manifold based on the air flow, the fuel gas flow, and the exhaust gas recirculation flow;

[0007] A state of a pressure sensor at a throat of the EGR module is determined according to the first stagnation pressure, the second stagnation pressure, and the third stagnation pressure.

[0008] Optionally, the engine speed, speed-load change rate, and engine water temperature satisfying set conditions include:

[0009] The engine speed exceeds the set speed limit, the speed load change rate is lower than the set change rate limit, and the engine water temperature is greater than the set water temperature limit.

[0010] Optionally, before obtaining the air flow before the throttle valve, the gas flow at the throat, and the exhaust gas recirculation flow at the intake manifold of the EGR module, the method further includes:

[0011] Obtaining a first pipe flow rate before the throttle valve, a second pipe flow rate at the throat, and a third pipe flow rate at the intake manifold of the EGR module;

[0012] Obtain the air flow before the throttle valve, the gas flow at the throat, and the exhaust gas recirculation flow at the intake manifold of the EGR module, including:

[0013] Determining the air flow before the throttle valve of the EGR module according to the first pipe flow; and

[0014] determining the gas flow at the throat of the EGR module according to the first pipeline flow and the second pipeline flow; and

[0015] An exhaust gas recirculation flow rate at an intake manifold of an EGR module is determined according to the first pipe flow rate and the third pipe flow rate.

[0016] Optionally, before respectively determining the first stagnation pressure before the throttle valve, the second stagnation pressure at the throat, and the third stagnation pressure at the intake manifold based on the air flow rate, the gas flow rate, and the exhaust gas recirculation flow rate, the method further includes:

[0017] Obtain the pressure value before the throttle valve, the pressure value at the throat, the pressure value at the intake manifold, the temperature value before the throttle valve, the temperature value at the throat, and the temperature value at the intake manifold, and obtain the gas constant, the molar mass of air, the molar mass of gas, the effective flow area before the throttle valve, the effective flow area at the throat, and the effective flow area at the intake manifold;

[0018] Determining a first stagnation pressure before the throttle valve, a second stagnation pressure at the throat, and a third stagnation pressure at the intake manifold based on the air flow, the fuel gas flow, and the exhaust gas recirculation flow, respectively, includes:

[0019] determining a first stagnation pressure at the front end of the throttle valve according to the pressure value at the front end of the throttle valve, the air flow rate, the gas constant, the air molar mass, the effective flow area at the front end of the throttle valve, and the temperature value at the front end of the throttle valve; and

[0020] Determining a second stagnation pressure at the throat according to the throat pressure value, the air flow rate, the gas flow rate, the gas constant, the air molar mass, the gas molar mass, the effective flow area at the throat, and the throat temperature value; and

[0021] The third stagnation pressure at the intake manifold is determined according to the pressure value at the intake manifold, the air flow rate, the fuel gas flow rate, the exhaust gas recirculation flow rate, the gas constant, the air molar mass, the fuel gas molar mass, the effective flow area at the intake manifold, and the temperature value at the intake manifold.

[0022] Optionally, determining the first stagnation pressure before the throttle valve according to the pressure value before the throttle valve, the air flow rate, the gas constant, the air molar mass, the effective flow area before the throttle valve, and the temperature value before the throttle valve includes:

[0023] The first stagnation pressure before the throttle valve is determined using the following formula:

[0024]

[0025] Wherein, P0 is the first stagnation pressure before the throttle valve; p0 is the pressure value before the throttle valve; m0 is the air flow rate; R is the gas constant; M0 is the air molar mass; A0 is the effective flow area before the throttle valve; T0 is the temperature value before the throttle valve;

[0026] Determining the second stagnation pressure at the throat according to the pressure value at the throat, the air flow rate, the gas flow rate, the gas constant, the air molar mass, the gas molar mass, the effective flow area at the throat, and the temperature value at the throat includes:

[0027] The second stagnation pressure at the throat is determined using the following formula:

[0028]

[0029] Wherein, P1 is the second stagnation pressure at the throat; p1 is the pressure value at the throat; m ng is the gas flow rate; M ng is the molar mass of the gas; A1 is the effective flow area at the throat; T1 is the temperature at the throat;

[0030] Determining the third stagnation pressure at the intake manifold according to the pressure value at the intake manifold, the air flow rate, the fuel gas flow rate, the exhaust gas recirculation flow rate, the gas constant, the air molar mass, the fuel gas molar mass, the effective flow area at the intake manifold, and the temperature value at the intake manifold includes:

[0031] The third stagnation pressure at the intake manifold is determined using the following formula:

[0032]

[0033] Wherein, P2 is the third stagnation pressure at the intake manifold; p2 is the pressure value at the intake manifold; m EGR is the exhaust gas recirculation flow rate; A2 is the effective flow area at the intake manifold; T2 is the temperature value at the intake manifold.

[0034] Optionally, obtaining the air flow before the throttle valve of the EGR module includes:

[0035] The air flow in front of the throttle valve of the EGR module is calculated based on the speed density method.

[0036] Optionally, determining a state of a pressure sensor at a throat of the EGR module according to the first stagnation pressure, the second stagnation pressure, and the third stagnation pressure includes:

[0037] If the second stagnation pressure is higher than the first stagnation pressure, determining that the state of the pressure sensor at the throat of the EGR module is exceeding the dynamic diagnosis upper limit fault;

[0038] If the second stagnation pressure is lower than the third stagnation pressure, it is determined that the state of the pressure sensor at the throat of the EGR module is a fault exceeding a dynamic diagnosis lower limit.

[0039] According to another aspect of the present invention, an EGR module pressure sensor detection device is provided, the EGR module pressure sensor detection device comprising:

[0040] A flow acquisition module is used to acquire the air flow before the throttle valve of the EGR module, the gas flow at the throat, and the exhaust gas recirculation flow at the intake manifold when the engine speed, the speed-load change rate, and the engine water temperature meet the set conditions;

[0041] a pressure determination module, configured to determine a first stagnation pressure before the throttle valve, a second stagnation pressure at the throat, and a third stagnation pressure at the intake manifold, respectively, based on the air flow rate, the gas flow rate, and the exhaust gas recirculation flow rate;

[0042] The state detection module is configured to determine a state of a pressure sensor at a throat of the EGR module according to the first stagnation pressure, the second stagnation pressure, and the third stagnation pressure.

[0043] According to another aspect of the present invention, there is provided a vehicle, comprising:

[0044] at least one processor; and

[0045] a memory communicatively connected to the at least one processor; wherein,

[0046] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can perform the EGR module pressure sensor detection method according to any embodiment of the present invention.

[0047] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the EGR module pressure sensor detection method according to any embodiment of the present invention when executed.

[0048] The technical solution of the embodiment of the present invention is to obtain the air flow before the throttle valve, the gas flow at the throat, and the exhaust gas recirculation flow at the intake manifold of the EGR module when the engine speed, the speed-load change rate, and the engine water temperature meet the set conditions; based on the air flow, the gas flow, and the exhaust gas recirculation flow, respectively determine the first stagnation pressure before the throttle valve, the second stagnation pressure at the throat, and the third stagnation pressure at the intake manifold; and determine the state of the pressure sensor at the throat of the EGR module based on the first stagnation pressure, the second stagnation pressure, and the third stagnation pressure. The present invention solves the problem of the current lack of a reliability upper and lower limit diagnostic strategy for the pressure sensor at the throat of the EGR module, realizes accurate detection of the pressure sensor at the throat of the EGR module, and improves the detection reliability of the pressure sensor at the throat of the EGR module.

[0049] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0051] Figure 1 1 is a schematic structural diagram of an EGR module applicable to an embodiment of the present invention;

[0052] Figure 2 This is a flow chart of a method for detecting an EGR module pressure sensor according to a first embodiment of the present invention;

[0053] Figure 3 This is a flow chart of a method for detecting an EGR module pressure sensor according to a second embodiment of the present invention;

[0054] Figure 4 This is a structural diagram of an EGR module pressure sensor detection device provided according to a third embodiment of the present invention;

[0055] Figure 5 It is a structural schematic diagram of a vehicle for implementing the EGR module pressure sensor detection method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0056] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0057] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0058] Based on the EGR module characteristics of the post-treatment system, combined Figure 1 , Figure 1 The corresponding relationship between the stagnation pressure at various locations 10 points in front of the middle throttle valve, 20 points at the throat, and 30 points at the intake manifold is as follows:

[0059] P0=P1+dP1=P2+dP1+dP2

[0060] Where P0 is the stagnation pressure at 10° in front of the throttle valve; P1 is the stagnation pressure at the throat 20°; P3 is the stagnation pressure at the intake manifold 30°; dP1 is the dynamic pressure loss from 10° in front of the throttle valve to the throat 20°; and dP2 is the dynamic pressure loss from the throat 20° to the intake manifold 30°.

[0061] Using the energy balance principle and accounting for pressure drop losses in the intake line, the stagnation pressure at the throttle valve 10 meters in front of the throttle is higher than the stagnation pressure at the throat 20, which in turn is higher than the stagnation pressure at the intake manifold 30. Based on this, and based on the stagnation pressures at the throttle valve 10 meters in front of the throttle, the throat 20, and the intake manifold 30, the present application provides an EGR module pressure sensor detection method, device, vehicle, and storage medium to accurately diagnose the status of the EGR module throat pressure sensor.

[0062] Example 1

[0063] Figure 2 A flowchart of an EGR module pressure sensor detection method is provided for the first embodiment of the present invention. This embodiment is applicable to the case of accurately diagnosing the state of the pressure sensor at the throat of the EGR module. The EGR module pressure sensor detection method can be performed by an EGR module pressure sensor detection device. The EGR module pressure sensor detection device can be implemented in the form of hardware and / or software. The EGR module pressure sensor detection device can be configured in a vehicle or a vehicle's after-treatment system. Figure 2 As shown, the EGR module pressure sensor detection method includes:

[0064] S110. When the engine speed, speed-load change rate, and engine water temperature meet set conditions, obtain the air flow rate before the throttle valve, the gas flow rate at the throat, and the exhaust gas recirculation flow rate at the intake manifold of the EGR module.

[0065] Among them, the engine speed, speed-load change rate and engine water temperature meet the set conditions that the engine speed exceeds the set speed limit, the speed-load change rate is lower than the set change rate limit, and the engine water temperature is greater than the set water temperature limit. The set speed limit, the set change rate limit and the set water temperature limit can be selected and set by those skilled in the art according to the actual situation of the engine, and this embodiment does not impose any restrictions on this.

[0066] It can be understood that when the engine speed exceeds the set speed limit, the speed load change rate is lower than the set change rate limit, and the engine water temperature is greater than the set water temperature limit, the engine is in a steady-state operating condition.

[0067] Continue to see Figure 1 , obtain the first pipe flow rate before the throttle valve 10 of the EGR module, the second pipe flow rate at the throat 20, and the third pipe flow rate at the intake manifold 30. Based on the EGR module characteristics of the aftertreatment system, refer to the following flow balance formula:

[0068] m0=m1-m ng =m2-m ng -mEGR

[0069] Among them, m0 is the first pipe flow before the throttle valve 10, that is, the air flow before the throttle valve of the EGR module; m1 is the second pipe flow at the throat 20; and m2 is the third pipe flow at the intake manifold 30.

[0070] It is understandable that the first pipeline flow rate, the second pipeline flow rate and the third pipeline flow rate can all be obtained by calculation means such as the existing velocity density method, and this embodiment does not impose any limitation on the acquisition means.

[0071] For example, since the first pipe flow before the throttle valve 10 is the air flow flowing into the engine, the first pipe flow before the throttle valve 10 is equal to the air flow before the throttle valve of the EGR module, the air flow before the throttle valve of the EGR module is calculated according to the speed density method.

[0072] On the basis of the above, the flow rate of the second pipeline is equal to the flow rate of the first pipeline and the gas flow rate m at the throat of the EGR module. ng The third pipeline flow is equal to the first pipeline flow and the gas flow m at the throat of the EGR module. ng And the exhaust gas recirculation flow rate m at the intake manifold of the EGR module EGR sum.

[0073] S120 : Based on the air flow rate, the fuel gas flow rate, and the exhaust gas recirculation flow rate, respectively determine a first stagnation pressure before the throttle valve, a second stagnation pressure at the throat, and a third stagnation pressure at the intake manifold.

[0074] On the basis of the above, before respectively determining the first stagnation pressure before the throttle valve, the second stagnation pressure at the throat, and the third stagnation pressure at the intake manifold based on the air flow rate, the gas flow rate, and the exhaust gas recirculation flow rate, the pressure value p0 before the throttle valve, the pressure value p1 at the throat, the pressure value p2 at the intake manifold, the temperature value T0 before the throttle valve, the temperature value T1 at the throat, and the temperature value T2 at the intake manifold are obtained, and the gas constant R, the air molar mass M0, and the gas molar mass M ng , the effective flow area A0 in front of the throttle valve, the effective flow area A1 at the throat, and the effective flow area A2 at the intake manifold.

[0075] Specifically, the first stagnation pressure before the throttle valve is determined according to the pressure value before the throttle valve, the air flow rate, the gas constant, the air molar mass, the effective flow area before the throttle valve, and the temperature value before the throttle valve using the following formula:

[0076]

[0077] Wherein, P0 is the first stagnation pressure before the throttle valve; p0 is the pressure value before the throttle valve; m0 is the air flow rate; R is the gas constant; M0 is the air molar mass; A0 is the effective flow area before the throttle valve; T0 is the temperature value before the throttle valve;

[0078] The second stagnation pressure at the throat is determined using the following formula based on the pressure value at the throat, the air flow rate, the gas flow rate, the gas constant, the air molar mass, the gas molar mass, the effective flow area at the throat, and the temperature value at the throat. Specifically, it is:

[0079]

[0080] Wherein, P1 is the second stagnation pressure at the throat; p1 is the pressure value at the throat; m ng is the gas flow rate; M ng is the molar mass of the gas; A1 is the effective flow area at the throat; T1 is the temperature at the throat;

[0081] The third stagnation pressure at the intake manifold is determined using the following formula based on the pressure value at the intake manifold, the air flow rate, the gas flow rate, the exhaust gas recirculation flow rate, the gas constant, the air molar mass, the gas molar mass, the effective flow area at the intake manifold, and the temperature value at the intake manifold. Specifically, it is:

[0082]

[0083] Wherein, P2 is the third stagnation pressure at the intake manifold; p2 is the pressure value at the intake manifold; m EGR is the exhaust gas recirculation flow rate; A2 is the effective flow area at the intake manifold; T2 is the temperature value at the intake manifold.

[0084] S130 : Determine a state of a pressure sensor at a throat of the EGR module according to the first stagnation pressure, the second stagnation pressure, and the third stagnation pressure.

[0085] The EGR module's throat pressure sensor status includes normal status, exceeding the upper limit of dynamic diagnosis fault, and exceeding the lower limit of dynamic diagnosis fault. If the EGR module's throat pressure sensor status is exceeding the upper limit of dynamic diagnosis fault, it means that the EGR module's throat pressure sensor exceeds the maximum detectable pressure value when dynamically detecting the throat pressure value. If the EGR module's throat pressure sensor status is exceeding the lower limit of dynamic diagnosis fault, it means that the EGR module's throat pressure sensor cannot detect a value less than the minimum pressure value when dynamically detecting the throat pressure value.

[0086] In this embodiment, using the energy balance principle and accounting for intake manifold pressure drop, the EGR module's throat pressure sensor is considered normal if the stagnation pressure before the throttle valve is higher than the stagnation pressure at the throat, and if the stagnation pressure at the throat is higher than the stagnation pressure at the intake manifold. Furthermore, if the stagnation pressure at the throat exceeds the stagnation pressure before the throttle valve, or falls below the stagnation pressure at the intake manifold, the throat pressure sensor is considered to have drifted, indicating that the EGR module's throat pressure sensor has exceeded the upper or lower limit of dynamic diagnosis.

[0087] Specifically, if the second stagnation pressure is higher than the first stagnation pressure, it is determined that the state of the pressure sensor at the throat of the EGR module is a fault exceeding the dynamic diagnosis upper limit; if the second stagnation pressure is lower than the third stagnation pressure, it is determined that the state of the pressure sensor at the throat of the EGR module is a fault exceeding the dynamic diagnosis lower limit.

[0088] The technical solution of the embodiment of the present invention is to obtain the air flow before the throttle valve, the gas flow at the throat, and the exhaust gas recirculation flow at the intake manifold of the EGR module when the engine speed, the speed-load change rate, and the engine water temperature meet the set conditions; based on the air flow, the gas flow, and the exhaust gas recirculation flow, respectively determine the first stagnation pressure before the throttle valve, the second stagnation pressure at the throat, and the third stagnation pressure at the intake manifold; and determine the state of the pressure sensor at the throat of the EGR module based on the first stagnation pressure, the second stagnation pressure, and the third stagnation pressure. The present invention solves the problem of the current lack of a reliability upper and lower limit diagnostic strategy for the pressure sensor at the throat of the EGR module, realizes accurate detection of the pressure sensor at the throat of the EGR module, and improves the detection reliability of the pressure sensor at the throat of the EGR module.

[0089] Example 2

[0090] Figure 3 This is a flow chart of a method for detecting an EGR module pressure sensor provided by the second embodiment of the present invention. This embodiment provides an optional implementation method based on the above embodiment. Figure 3 As shown, the EGR module pressure sensor detection method includes:

[0091] S210. When the engine speed exceeds the set speed limit, the speed-load change rate is lower than the set change rate limit, and the engine water temperature is greater than the set water temperature limit, obtain a first pipe flow rate before the throttle valve, a second pipe flow rate at the throat, and a third pipe flow rate at the intake manifold of the EGR module.

[0092] S220. Determine the air flow rate before the throttle valve of the EGR module based on the first pipeline flow rate; and determine the gas flow rate at the throat of the EGR module based on the first pipeline flow rate and the second pipeline flow rate; and determine the exhaust gas recirculation flow rate at the intake manifold of the EGR module based on the first pipeline flow rate and the third pipeline flow rate.

[0093] S230: Obtain the pressure value before the throttle valve, the pressure value at the throat, the pressure value at the intake manifold, the temperature value before the throttle valve, the temperature value at the throat, and the temperature value at the intake manifold, and obtain the gas constant, the molar mass of air, the molar mass of fuel gas, the effective flow area before the throttle valve, the effective flow area at the throat, and the effective flow area at the intake manifold.

[0094] S240, determining a first stagnation pressure at the front end of the throttle valve according to the pressure value at the front end of the throttle valve, the air flow rate, the gas constant, the air molar mass, the effective flow area at the front end of the throttle valve, and the temperature value at the front end of the throttle valve; and

[0095] Determining a second stagnation pressure at the throat according to the throat pressure value, the air flow rate, the gas flow rate, the gas constant, the air molar mass, the gas molar mass, the effective flow area at the throat, and the throat temperature value; and

[0096] The third stagnation pressure at the intake manifold is determined according to the pressure value at the intake manifold, the air flow rate, the fuel gas flow rate, the exhaust gas recirculation flow rate, the gas constant, the air molar mass, the fuel gas molar mass, the effective flow area at the intake manifold, and the temperature value at the intake manifold.

[0097] On the basis of the above embodiment, according to the principle of conservation of mass, when the engine is in a steady-state operating condition, the mass flowing into the pipe is equal to the mass flowing out of the pipe.

[0098] Based on the following existing formula, calculate the dynamic pressure at each point of the pipeline;

[0099]

[0100]

[0101]

[0102] And, based on the EGR module characteristics of the aftertreatment system, refer to the following flow balance formula:

[0103] m0=m1-m ng =m2-m ng -m EGR

[0104] Then, the first stagnation pressure before the throttle, the second stagnation pressure at the throat, and the third stagnation pressure at the intake manifold are obtained, specifically:

[0105]

[0106]

[0107]

[0108] S250: If the second stagnation pressure is higher than the first stagnation pressure, determining that the state of the pressure sensor at the throat of the EGR module is exceeding the dynamic diagnosis upper limit fault;

[0109] If the second stagnation pressure is lower than the third stagnation pressure, it is determined that the state of the pressure sensor at the throat of the EGR module is a fault exceeding a dynamic diagnosis lower limit.

[0110] The technical solution of the present application utilizes the application characteristics of the EGR module on the engine and the mass balance and energy balance principles at various positions in front of the throttle valve, at the throat and at the intake manifold. Based on the deviation of the first stagnation pressure in front of the throttle valve, the second stagnation pressure at the throat and the third stagnation pressure at the intake manifold, the credibility of the pressure sensor at the throat of the EGR module is diagnosed, thereby realizing accurate diagnosis of the status of the pressure sensor at the throat of the EGR module.

[0111] Example 3

[0112] Figure 4 This is a schematic diagram of a method for detecting an EGR module pressure sensor according to the third embodiment of the present invention. Figure 4 As shown, the EGR module pressure sensor detection device includes:

[0113] The flow acquisition module 410 is used to acquire the air flow before the throttle valve, the gas flow at the throat, and the exhaust gas recirculation flow at the intake manifold of the EGR module when the engine speed, the speed-load change rate, and the engine water temperature meet the set conditions;

[0114] a pressure determination module 420 for determining a first stagnation pressure before the throttle valve, a second stagnation pressure at the throat, and a third stagnation pressure at the intake manifold based on the air flow, the gas flow, and the exhaust gas recirculation flow;

[0115] The state detection module 430 is configured to determine a state of a pressure sensor at a throat of the EGR module according to the first stagnation pressure, the second stagnation pressure, and the third stagnation pressure.

[0116] Optionally, the engine speed, speed-load change rate, and engine water temperature satisfying set conditions include:

[0117] The engine speed exceeds the set speed limit, the speed load change rate is lower than the set change rate limit, and the engine water temperature is greater than the set water temperature limit.

[0118] Optionally, the EGR module pressure sensor detection device further includes:

[0119] a pipeline flow acquisition module, configured to acquire a first pipeline flow before the throttle valve, a second pipeline flow at the throat, and a third pipeline flow at the intake manifold of the EGR module;

[0120] Obtain the air flow before the throttle valve, the gas flow at the throat, and the exhaust gas recirculation flow at the intake manifold of the EGR module, specifically for:

[0121] Determining the air flow before the throttle valve of the EGR module according to the first pipe flow; and

[0122] determining the gas flow at the throat of the EGR module according to the first pipeline flow and the second pipeline flow; and

[0123] An exhaust gas recirculation flow rate at an intake manifold of an EGR module is determined according to the first pipe flow rate and the third pipe flow rate.

[0124] Optionally, the EGR module pressure sensor detection device further includes:

[0125] an information acquisition module, configured to acquire a pressure value before the throttle valve, a pressure value at the throat, a pressure value at the intake manifold, a temperature value before the throttle valve, a temperature value at the throat, and a temperature value at the intake manifold, and to acquire a gas constant, a molar mass of air, a molar mass of fuel gas, an effective flow area before the throttle valve, an effective flow area at the throat, and an effective flow area at the intake manifold;

[0126] The pressure determination module 420 is specifically configured to:

[0127] determining a first stagnation pressure at the front end of the throttle valve according to the pressure value at the front end of the throttle valve, the air flow rate, the gas constant, the air molar mass, the effective flow area at the front end of the throttle valve, and the temperature value at the front end of the throttle valve; and

[0128] Determining a second stagnation pressure at the throat according to the throat pressure value, the air flow rate, the gas flow rate, the gas constant, the air molar mass, the gas molar mass, the effective flow area at the throat, and the throat temperature value; and

[0129] The third stagnation pressure at the intake manifold is determined according to the pressure value at the intake manifold, the air flow rate, the fuel gas flow rate, the exhaust gas recirculation flow rate, the gas constant, the air molar mass, the fuel gas molar mass, the effective flow area at the intake manifold, and the temperature value at the intake manifold.

[0130] Optionally, determining the first stagnation pressure before the throttle valve according to the pressure value before the throttle valve, the air flow rate, the gas constant, the air molar mass, the effective flow area before the throttle valve, and the temperature value before the throttle valve includes:

[0131] The first stagnation pressure before the throttle valve is determined using the following formula:

[0132]

[0133] Wherein, P0 is the first stagnation pressure before the throttle valve; p0 is the pressure value before the throttle valve; m0 is the air flow rate; R is the gas constant; M0 is the air molar mass; A0 is the effective flow area before the throttle valve; T0 is the temperature value before the throttle valve;

[0134] Determining the second stagnation pressure at the throat according to the pressure value at the throat, the air flow rate, the gas flow rate, the gas constant, the air molar mass, the gas molar mass, the effective flow area at the throat, and the temperature value at the throat includes:

[0135] The second stagnation pressure at the throat is determined using the following formula:

[0136]

[0137] Wherein, P1 is the second stagnation pressure at the throat; p1 is the pressure value at the throat; m ng is the gas flow rate; M ng is the molar mass of the gas; A1 is the effective flow area at the throat; T1 is the temperature at the throat;

[0138] Determining the third stagnation pressure at the intake manifold according to the pressure value at the intake manifold, the air flow rate, the fuel gas flow rate, the exhaust gas recirculation flow rate, the gas constant, the air molar mass, the fuel gas molar mass, the effective flow area at the intake manifold, and the temperature value at the intake manifold includes:

[0139] The third stagnation pressure at the intake manifold is determined using the following formula:

[0140]

[0141] Wherein, P2 is the third stagnation pressure at the intake manifold; p2 is the pressure value at the intake manifold; m EGR is the exhaust gas recirculation flow rate; A2 is the effective flow area at the intake manifold; T2 is the temperature value at the intake manifold.

[0142] Optionally, the obtaining of the air flow rate before the throttle valve of the EGR module is specifically used for:

[0143] The air flow in front of the throttle valve of the EGR module is calculated based on the speed density method.

[0144] Optionally, the status detection module 430 is specifically configured to:

[0145] If the second stagnation pressure is higher than the first stagnation pressure, determining that the state of the pressure sensor at the throat of the EGR module is exceeding the dynamic diagnosis upper limit fault;

[0146] If the second stagnation pressure is lower than the third stagnation pressure, it is determined that the state of the pressure sensor at the throat of the EGR module is a fault exceeding a dynamic diagnosis lower limit.

[0147] The EGR module pressure sensor detection method provided in the embodiment of the present invention can execute the EGR module pressure sensor detection method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing the EGR module pressure sensor detection method.

[0148] Example 4

[0149] Figure 5A schematic diagram of a vehicle 510 that can be used to implement an embodiment of the present invention is shown. The vehicle includes various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The vehicle may also include various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0150] like Figure 5 As shown, the vehicle 510 includes at least one processor 511 and a memory, such as a read-only memory (ROM) 512, a random access memory (RAM) 513, etc., which is communicatively connected to the at least one processor 511. The memory stores a computer program that can be executed by the at least one processor, and the processor 511 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 512 or the computer program loaded from the storage unit 518 into the random access memory (RAM) 513. Various programs and data required for the operation of the vehicle 510 can also be stored in the RAM 513. The processor 511, ROM 512, and RAM 513 are connected to each other via a bus 514. An input / output (I / O) interface 515 is also connected to the bus 514.

[0151] Various components in the vehicle 510 are connected to the I / O interface 515, including an input unit 516, such as a keyboard, mouse, etc.; an output unit 517, such as various types of displays, speakers, etc.; a storage unit 518, such as a magnetic disk, optical disk, etc.; and a communication unit 519, such as a network card, modem, wireless communication transceiver, etc. The communication unit 519 allows the vehicle 510 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0152] Processor 511 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of processor 511 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any other suitable processors, controllers, microcontrollers, etc. Processor 511 executes the various methods and processes described above, such as the EGR module pressure sensor detection method.

[0153] In some embodiments, the EGR module pressure sensor detection method can be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 518. In some embodiments, part or all of the computer program can be loaded and / or installed on vehicle 510 via ROM 512 and / or communication unit 519. When the computer program is loaded into RAM 513 and executed by processor 511, one or more steps of the EGR module pressure sensor detection method described above can be performed. Alternatively, in other embodiments, processor 511 can be configured to execute the EGR module pressure sensor detection method in any other suitable manner (e.g., via firmware).

[0154] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0155] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0156] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0157] To provide interaction with a user, the systems and techniques described herein can be implemented in a vehicle having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the vehicle. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0158] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0159] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0160] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0161] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for detecting an EGR module pressure sensor, characterized in that: include: When the engine speed, speed-load change rate, and engine water temperature meet set conditions, the air flow rate at the front of the EGR module, the gas flow rate at the throat, and the exhaust gas recirculation flow rate at the intake manifold are obtained; wherein the engine speed, speed-load change rate, and engine water temperature meet the set conditions, including: the engine speed exceeds the set speed limit, the speed-load change rate is lower than the set change rate limit, and the engine water temperature is greater than the set water temperature limit; Based on the air flow, the gas flow and the exhaust gas recirculation flow, a first stagnation pressure at the front of the throttle valve, a second stagnation pressure at the throat and a third stagnation pressure at the intake manifold are determined respectively; wherein, before the first stagnation pressure at the front of the throttle valve, the second stagnation pressure at the throat and the third stagnation pressure at the intake manifold are determined respectively based on the air flow, the gas flow and the exhaust gas recirculation flow, the method further includes: obtaining a pressure value at the front of the throttle valve, a pressure value at the throat, a pressure value at the intake manifold, a temperature value at the front of the throttle valve, a temperature value at the throat and a temperature value at the intake manifold, and obtaining a gas constant, an air molar mass, a gas molar mass, an effective flow area at the front of the throttle valve, an effective flow area at the throat and an effective flow area at the intake manifold; based on the air flow, the gas flow and the exhaust gas recirculation flow, the first stagnation pressure at the front of the throttle valve, the second stagnation pressure at the throat and the third stagnation pressure at the intake manifold are determined respectively. the stagnation pressure at the throat, the second stagnation pressure at the throat, and the third stagnation pressure at the intake manifold, comprising: determining the first stagnation pressure at the front of the throttle valve according to the pressure value before the throttle valve, the air flow rate, the gas constant, the air molar mass, the effective flow area before the throttle valve, and the temperature value before the throttle valve; and determining the second stagnation pressure at the throat according to the pressure value at the throat, the air flow rate, the gas flow rate, the gas constant, the air molar mass, the gas molar mass, the effective flow area at the throat, and the temperature value at the throat; and determining the third stagnation pressure at the intake manifold according to the pressure value at the intake manifold, the air flow rate, the gas flow rate, the exhaust gas recirculation flow rate, the gas constant, the air molar mass, the gas molar mass, the effective flow area at the intake manifold, and the temperature value at the intake manifold; The state of the pressure sensor at the throat of the EGR module is determined based on the first stagnation pressure, the second stagnation pressure, and the third stagnation pressure; wherein, the state of the pressure sensor at the throat of the EGR module is determined based on the first stagnation pressure, the second stagnation pressure, and the third stagnation pressure, including: if the second stagnation pressure is higher than the first stagnation pressure, determining that the state of the pressure sensor at the throat of the EGR module is an exceeded dynamic diagnosis upper limit fault; if the second stagnation pressure is lower than the third stagnation pressure, determining that the state of the pressure sensor at the throat of the EGR module is an exceeded dynamic diagnosis lower limit fault.

2. The EGR module pressure sensor detection method according to claim 1, characterized in that: Before obtaining the air flow before the throttle valve, the gas flow at the throat, and the exhaust gas recirculation flow at the intake manifold of the EGR module, the following steps are also included: Obtaining a first pipe flow rate before the throttle valve, a second pipe flow rate at the throat, and a third pipe flow rate at the intake manifold of the EGR module; Obtain the air flow before the throttle valve, the gas flow at the throat, and the exhaust gas recirculation flow at the intake manifold of the EGR module, including: Determining the air flow before the throttle valve of the EGR module according to the first pipe flow; and determining the gas flow at the throat of the EGR module according to the first pipeline flow and the second pipeline flow; and An exhaust gas recirculation flow rate at an intake manifold of an EGR module is determined according to the first pipe flow rate and the third pipe flow rate.

3. The EGR module pressure sensor detection method according to claim 1, characterized in that: Determining the first stagnation pressure before the throttle valve according to the pressure value before the throttle valve, the air flow rate, the gas constant, the air molar mass, the effective flow area before the throttle valve, and the temperature value before the throttle valve includes: The first stagnation pressure before the throttle valve is determined using the following formula: Wherein, P0 is the first stagnation pressure before the throttle valve; p0 is the pressure value before the throttle valve; m0 is the air flow rate; R is the gas constant; M0 is the air molar mass; A0 is the effective flow area before the throttle valve; T0 is the temperature value before the throttle valve; Determining the second stagnation pressure at the throat according to the pressure value at the throat, the air flow rate, the gas flow rate, the gas constant, the air molar mass, the gas molar mass, the effective flow area at the throat, and the temperature value at the throat includes: The second stagnation pressure at the throat is determined using the following formula: Wherein, P1 is the second stagnation pressure at the throat; p1 is the pressure value at the throat; m ng is the gas flow rate; M ng is the molar mass of the gas; A1 is the effective flow area at the throat; T1 is the temperature at the throat; Determining the third stagnation pressure at the intake manifold according to the pressure value at the intake manifold, the air flow rate, the fuel gas flow rate, the exhaust gas recirculation flow rate, the gas constant, the air molar mass, the fuel gas molar mass, the effective flow area at the intake manifold, and the temperature value at the intake manifold includes: The third stagnation pressure at the intake manifold is determined using the following formula: Wherein, P2 is the third stagnation pressure at the intake manifold; p2 is the pressure value at the intake manifold; m EGR is the exhaust gas recirculation flow rate; A2 is the effective flow area at the intake manifold; T2 is the temperature value at the intake manifold.

4. The EGR module pressure sensor detection method according to claim 1, characterized in that: The obtaining of the air flow rate before the throttle valve of the EGR module includes: The air flow in front of the throttle valve of the EGR module is calculated based on the speed density method.

5. An EGR module pressure sensor detection device, characterized in that: include: a flow acquisition module, configured to acquire the air flow rate at the front of the throttle, the gas flow rate at the throat, and the exhaust gas recirculation flow rate at the intake manifold of the EGR module when the engine speed, the speed-load change rate, and the engine water temperature meet set conditions; wherein the engine speed, the speed-load change rate, and the engine water temperature meet the set conditions, including: the engine speed exceeds a set speed limit, the speed-load change rate is lower than a set change rate limit, and the engine water temperature is greater than a set water temperature limit; an information acquisition module, configured to acquire a pressure value before the throttle valve, a pressure value at the throat, a pressure value at the intake manifold, a temperature value before the throttle valve, a temperature value at the throat, and a temperature value at the intake manifold, and to acquire a gas constant, a molar mass of air, a molar mass of fuel gas, an effective flow area before the throttle valve, an effective flow area at the throat, and an effective flow area at the intake manifold; a pressure determination module, configured to determine, based on the air flow rate, the gas flow rate, and the exhaust gas recirculation flow rate, a first stagnation pressure at the front of the throttle valve, a second stagnation pressure at the throat, and a third stagnation pressure at the intake manifold, respectively; wherein the pressure determination module is specifically configured to: determine the first stagnation pressure at the front of the throttle valve based on the pre-throttle pressure value, the air flow rate, the gas constant, the air molar mass, the effective flow area at the front of the throttle valve, and the pre-throttle temperature value; and determine the second stagnation pressure at the throat based on the throat pressure value, the air flow rate, the gas flow rate, the gas constant, the air molar mass, the gas molar mass, the effective flow area at the throat, and the throat temperature value; and determine the third stagnation pressure at the intake manifold based on the intake manifold pressure value, the air flow rate, the gas flow rate, the exhaust gas recirculation flow rate, the gas constant, the air molar mass, the gas molar mass, the effective flow area at the intake manifold, and the intake manifold temperature value; a state detection module for determining a state of a pressure sensor at the throat of the EGR module based on the first stagnation pressure, the second stagnation pressure, and the third stagnation pressure; wherein the state detection module is specifically configured to: determine that the state of the pressure sensor at the throat of the EGR module is a fault exceeding a dynamic diagnosis upper limit if the second stagnation pressure is higher than the first stagnation pressure; and determine that the state of the pressure sensor at the throat of the EGR module is a fault exceeding a dynamic diagnosis lower limit if the second stagnation pressure is lower than the third stagnation pressure.

6. A vehicle, characterized in that: The vehicle comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor. The computer program is executed by the at least one processor so as to enable the at least one processor to perform the EGR module pressure sensor detection method according to any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the EGR module pressure sensor detection method according to any one of claims 1 to 4 when executed.

Images