CN116337328A - Reliability detection method and device for upstream pressure sensor of EGR (exhaust gas Recirculation) system and vehicle - Google Patents
Reliability detection method and device for upstream pressure sensor of EGR (exhaust gas Recirculation) system and vehicle Download PDFInfo
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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
Technical Field
The invention relates to the technical field of vehicle detection, in particular to a reliability detection method and device for an upstream pressure sensor of an EGR (exhaust gas Recirculation) system and a vehicle.
Background
China is a large automobile country, and along with the improvement of the living standard of people, the emission of automobiles is also more and more important.
The EGR system re-enters the cylinders by returning a portion of the exhaust gases from the engine to the intake manifold, along with fresh mixture. Due to the high content of CO in the exhaust gas 2 Polyatomic gas, CO 2 The gas cannot burn but absorbs a large amount of heat due to the high specific heat capacity, so that the highest combustion temperature of the mixture in the cylinder is reduced, thereby reducing the generation amount of NOx. Therefore, when the EGR system works, the detection precision of the working parts in the system, such as the upstream pressure sensor, the downstream pressure sensor and the like of the EGR valve, needs to be accurate, and the working parts with faults need to be found out in time and maintained or replaced, so that the emission rise caused by overlarge detection deviation is avoided, and the requirements of national standards are not met.
The existing fault detection scheme for the upstream pressure sensor of the EGR system is used for detecting faults when an automobile is in a flameout state, the scheme can only detect the detection precision of the upstream pressure sensor corresponding to the position of the 0 point, and can not determine whether the slope of the characteristic curve of the upstream pressure sensor drifts, so that even if the scheme is used for determining that the upstream pressure sensor has no faults, the condition that the detection precision of the upstream pressure sensor is poor still occurs when the automobile is tested under other working conditions.
Therefore, a technical problem of how to improve reliability detection accuracy of an upstream pressure sensor of an EGR valve is to be solved.
Disclosure of Invention
The technical problem of how to detect the working condition of the working components of the EGR system is solved. The invention provides a reliability detection method and device for an upstream pressure sensor of an EGR system and a vehicle.
According to an aspect of the embodiments of the present application, there is provided a method for detecting reliability of an upstream pressure sensor of an EGR system, including: acquiring the working condition of the EGR system; when the working condition of the EGR system accords with a 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 an EGR valve based on the EGR model flow, the venturi upstream temperature, the venturi differential pressure, and a 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 upstream pressure model value is included in a trusted interval or not; and when the first difference value is not included in the trusted interval, determining that the fault exists in the upstream pressure sensor of the EGR valve.
Optionally, the EGR system condition meeting the preset condition includes: acquiring a downstream pressure value of the EGR valve based on a downstream pressure sensor of the EGR valve; judging whether a second difference value between the upstream pressure model value and the downstream pressure value is larger than a preset value or not; and when the second difference value is larger than the preset value, determining that the working condition of the EGR system accords with the preset working condition.
Optionally, the 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 includes: acquiring 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, the venturi upstream temperature, and the venturi differential pressure.
Optionally, the method for determining the EGR valve model flow includes: acquiring total air inflow, air flow and gas flow; the EGR valve model flow rate is determined based on the intake total flow rate, the air flow rate, and the gas flow rate.
Optionally, the acquiring the total intake air amount includes: acquiring an intake manifold pressure value, an engine speed and an intake manifold temperature of an engine; the total intake air amount is determined based on the intake manifold pressure value, an engine speed, an intake manifold temperature, and a charge efficiency.
Optionally, the method for determining the upstream pressure model value further includes: acquiring a downstream pressure value, a downstream temperature value, an EGR model flow and an EGR valve opening value of an EGR valve; the upstream pressure model value is determined based on the downstream pressure value, the downstream temperature value, the EGR model flow, the EGR valve opening value, and the correction parameter.
Optionally, the determining the upstream pressure model value based on the downstream pressure value, the downstream temperature value, the EGR model flow, the EGR valve opening value, and the correction parameter includes: determining a second flow model of the EGR valve based on the downstream pressure value, the downstream temperature value, the EGR model flow, the EGR valve opening value, and the correction parameter; 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, the EGR valve opening value, and the correction parameter.
Optionally, the method for determining the upstream pressure model value further includes: acquiring a pre-vortex pressure value, a pre-vortex temperature value and EGR model flow of a turbine; the upstream pressure model value is determined based on a third pressure model, the pre-vortex pressure value, the pre-vortex temperature value, and the EGR model flow.
According to still another aspect of the embodiments of the present application, there is also provided a reliability detection apparatus of an upstream pressure sensor of an EGR system, including: the first acquisition module acquires the working condition of the EGR system; the second acquisition module is used for acquiring the temperature of the upstream of the venturi, the pressure difference of the venturi and the flow of the EGR valve model when the working condition of the EGR system accords with the preset working condition; a first analysis module that determines an upstream pressure model value of an EGR valve based on the EGR model flow, the venturi upstream temperature, the venturi differential pressure, and a first pressure model; the third acquisition module acquires an actual upstream pressure value of the EGR valve based on the upstream pressure sensor of the EGR valve; the second analysis module is used for judging whether the first difference value between the actual upstream pressure value and the upstream pressure model value is included in a trusted interval or not; and a third analysis module that determines that the EGR valve upstream pressure sensor is malfunctioning when the first difference is not included in the trusted interval.
According to still another aspect of the embodiments of the present application, there is also provided a vehicle including a controller for executing the method for detecting the reliability of the EGR system upstream pressure sensor according to any of the embodiments described above.
In the application, when the detection precision of the upstream pressure sensor is judged by utilizing the upstream pressure model value, the reliability of the upstream pressure model value is required to be ensured to be higher, namely the working condition of the EGR system accords with the preset working condition, the upstream pressure model value of the EGR valve is accurately judged by the requirement on the working condition, further, whether the upstream pressure sensor fails or not is judged by the first difference value, when the first difference value is not contained in the trusted interval, the deviation between the actual measurement value of the upstream pressure detected by the upstream pressure sensor and the upstream pressure model value is excessively large, namely the detection precision of the upstream pressure sensor is lower, the fault of the upstream pressure sensor is determined at the moment, after the fault is determined, the fault code is determined and recorded, the driver can conveniently detect the abnormal condition and the maintenance of the subsequent maintenance personnel in a mode of alarming and recording the fault code, the working condition range of allowing the reliability detection of the upstream pressure sensor is improved, further, the calculation accuracy of relevant parameters such as the EGR rate, the opening degree and the like of the EGR system is improved, and the accuracy of data detection and control of the EGR system is improved.
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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 embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of an alternative method of reliability detection for an upstream pressure sensor of an EGR system in accordance with embodiments of the present application;
FIG. 2 is a block diagram of an alternative device for detecting the plausibility of an upstream pressure sensor of an EGR system in accordance with an embodiment of the present application.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As described in the background art, in the existing fault detection scheme for the upstream pressure sensor of the EGR system, fault detection is performed when the automobile is in a flameout state, and the scheme can only detect the detection precision of the upstream pressure sensor corresponding to the position of the 0 point, and cannot determine whether the slope of the characteristic curve of the upstream pressure sensor drifts, so even if the scheme is used for determining that the upstream pressure sensor has no fault, the situation that the detection precision of the upstream pressure sensor is poor still occurs when the automobile is tested under other working conditions.
Thus, according to one aspect of the embodiments of the present application, there is provided a method for detecting the reliability of an upstream pressure sensor of an EGR system, as shown in fig. 1, the flow of which may include the steps of:
s10, acquiring working conditions of the EGR system.
S20, when the working condition of the EGR system accords with the preset working condition, acquiring the temperature of the upstream of the venturi, the pressure difference of the venturi and the flow of the EGR valve model.
S30, 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 a first pressure model.
S40, acquiring an actual upstream pressure value of the EGR valve based on the upstream pressure sensor of the EGR valve.
S50, judging whether the first difference value between the actual upstream pressure value and the upstream pressure model value is included in a trusted zone.
S60, determining that the upstream pressure sensor of the EGR valve has a fault when the first difference value is not included in the trusted interval.
In the embodiment of the application, when the detection precision of the upstream pressure sensor is judged by utilizing the upstream pressure model value, the higher reliability of the upstream pressure model value needs to be ensured, namely, the working condition of the EGR system accords with the preset working condition, the upstream pressure model value of the EGR valve is accurately judged through the requirement on the working condition, and then whether the upstream pressure sensor breaks down is judged through the first difference value, when the first difference value is not contained in the trusted interval, the fact that the deviation between the measured value of the upstream pressure detected by the upstream pressure sensor and the upstream pressure model value is overlarge is characterized, namely, the detection precision of the upstream pressure sensor is lower, the fault of the upstream pressure sensor is determined at the moment, after the fault is determined, a driver can conveniently detect the abnormal condition and the maintenance of subsequent maintenance personnel in a mode of alarming and recording fault codes, the working condition range of allowing the reliability detection of the upstream pressure sensor is improved, further calculation accuracy of relevant parameters such as the EGR rate, the opening degree and the like in the EGR system is improved, and the accuracy of the detection and control of the data of the EGR system is improved.
As an exemplary embodiment, the EGR system operating condition conforming to a preset operating condition includes: acquiring a downstream pressure value of the EGR valve based on a downstream pressure sensor of the EGR valve; judging whether a second difference value between the upstream pressure model value and the downstream pressure value is larger than a preset value or not; and when the second difference value is larger than the preset value, determining that the working condition of the EGR system accords with the preset working condition.
In this embodiment, when determining whether the upstream pressure sensor has reliability, that is, whether it is faulty or not, by using the first difference value, it is necessary to ensure accuracy of the upstream pressure model value, and the calculation of the upstream pressure model value may be performed when the air flow sensor, the front oxygen sensor, and the EGR differential pressure sensor are all faulty, and the engine speed and the EGR valve opening value are respectively maintained at certain values. The fixed value corresponding to the engine speed and the fixed value corresponding to the EGR valve opening value can be determined through bench test. The accuracy of the reliability detection of the upstream pressure sensor can be further improved through the constraint on the working condition of the calculation of the upstream pressure model value.
As an exemplary embodiment, the 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 includes: acquiring 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, the venturi upstream temperature, and the venturi differential pressure.
In this embodiment, in the EGR system having the venturi structure, the first flow model can be obtained by performing corresponding conversion on the first flow model and the temperature upstream of the venturi, and the first flow model is shown by the following formula (1):
wherein beta is the ratio of the diameter of the venturi throat to the diameter of the upstream position of the venturi, A EGR Is the area of the venturi throat, epsilon is the compressibility factor, ρ 1 Is the density of the gas upstream of the venturi, p 1 Is the pressure value of the gas upstream of the Venturi, p 2 Refers to the pressure, k, of venturi laryngeal gas 1 Is constant, Δp is the venturi differential pressure. ρ 1 Can be defined by p 1 、T 1 Obtained by combining a state equation, p 2 The pressure of the venturi laryngeal gas can be measured by p 1 - Δp is calculated, k 1 It can be determined through experiments that Deltap is the value measured by a Venturi differential pressure sensor, and epsilon can be determined by beta and p 1 、p 2 The expression is shown in the formula (2):
wherein k is a thermodynamic constant, and converting the above formulae (1) - (2) to ρ in combination with the state equation 1 And converting into the forms of P1 and T1 to obtain a first pressure model, wherein the first pressure model is shown in the following formula (3):
wherein ε (t-1) For the value epsilon, k at the last moment 2 Is constant. Based on this, an EGR valve upstream pressure model value may be calculated from the EGR model flow, the venturi upstream temperature, and the venturi differential pressure.
As an exemplary embodiment, the method for determining the flow of the EGR valve model includes: acquiring total air inflow, air flow and gas flow; the EGR valve model flow rate is determined based on the intake total flow rate, the air flow rate, and the gas flow rate. The obtaining of the intake air total amount includes: acquiring an intake manifold pressure value, an engine speed and an intake manifold temperature of an engine; the total intake air amount is determined based on the intake manifold pressure value, an engine speed, an intake manifold temperature, and a charge efficiency.
In the present embodiment, the total amount of intake air can be calculated by the following formula (4):
wherein mfTotal is the total intake air quantity, n is the engine speed, and can beThe MAP is the pressure of the air inlet manifold of the engine, which is obtained by direct reading of the ECU, and can be detected by an air inlet manifold pressure sensor, the MAT is the temperature of the air inlet manifold of the engine, and can be detected by an air inlet manifold temperature sensor, k 3 For the inflation efficiency, the inflation efficiency can be obtained by calibrating in advance on a bench test.
After the total intake air amount is determined, calculation of the EGR valve model flow rate can be performed, see the following formula (5):
mfEGR＝mfTotal-mfAir-mfNG (5)
wherein mfEGR is the EGR valve model flow, mfTotal is the air intake total, mfAir is air flow, can be detected by an air flow meter, mfNG is gas flow, and ECU can be obtained by reading the fuel injection quantity for calculation.
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 and an EGR valve opening value of an EGR valve; the upstream pressure model value is determined based on the downstream pressure value, the downstream temperature value, the EGR model flow, the EGR valve opening value, and the correction parameter. The determining the upstream pressure model value based on the downstream pressure value, the downstream temperature value, the EGR model flow, the EGR valve opening value, and the correction parameter includes: determining a second flow model of the EGR valve based on the downstream pressure value, the downstream temperature value, the EGR model flow, the EGR valve opening value, and the correction parameter; 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, the EGR valve opening value, and the correction parameter.
In this embodiment, for the EGR system without the venturi structure, the table look-up determination may be performed based on the EGR valve model flow and the maps of the downstream pressure value, the downstream temperature value, the EGR valve opening value, and the upstream pressure model value of the EGR valve, that is, as shown in the following formula (6):
wherein mf is egr For EGR model flow, T 3 For the value of the temperature downstream of the EGR valve, p 3 For the value of the pressure downstream of the EGR valve, p 1 The model value of the upstream pressure of the EGR valve is represented by M, the opening value of the EGR valve is represented by f1, f2, f3 and f4, the corresponding fixed relation between the flow of the EGR model and the flow of the EGR model is converted from a map, and f5 is a correction parameter, and the correction parameter can be obtained through a test. And (3) determining an upstream pressure model value of the EGR valve based on the map and the formula (6), and further performing reliability detection on an upstream pressure sensor of the EGR valve when the working condition of the EGR system accords with the preset working condition.
As an exemplary embodiment, the method for determining the upstream pressure model value further includes: acquiring a pre-vortex pressure value, a pre-vortex temperature value and EGR model flow of a turbine; the upstream pressure model value is determined based on a third pressure model, the pre-vortex pressure value, the pre-vortex temperature value, and the EGR model flow.
In this embodiment, the upstream pressure model value may also be determined based on the turbine pre-vortex pressure value, the pre-vortex temperature value, and the EGR model flow, and combined with a hydrodynamic basic formula, that is, the third pressure model, as shown in the following formula (7):
wherein P is 1 For the upstream pressure model value, P 0 For the pre-vortex pressure value, mfEGR is EGR model flow, T 0 Is the value of the temperature before the vortex,
the method is characterized in that the corresponding relation is obtained through experiments on the basis of a two-dimensional interpolation table of the EGR model flow and the pre-vortex temperature value.
According to the method and the device, corresponding pressure models can be selected to calculate the upstream pressure model values based on different EGR systems and different parameters which can be acquired or calculated, and the reliability of the upstream pressure sensor is detected when the working condition of the EGR system accords with the preset working condition, so that the working condition range of the reliability detection of the upstream pressure sensor is increased, and whether the upstream pressure sensor fails or not can be detected more accurately.
According to another aspect of the embodiments of the present application, there is provided a reliability detection apparatus of an upstream pressure sensor of an EGR system, as shown in fig. 2, including:
a first obtaining module 201, configured to obtain the working condition of the EGR system;
the second obtaining module 202 obtains the upstream temperature of the venturi, the pressure difference of the venturi and the flow of the EGR valve model when the working condition of the EGR system accords with the preset working condition;
a first analysis module 203 that determines an upstream pressure model value of an EGR valve based on the EGR model flow, the venturi upstream temperature, the venturi differential pressure, and a first pressure model;
a third acquisition module 204 that acquires an actual upstream pressure value of the EGR valve based on the EGR valve upstream pressure sensor;
a second analysis module 205, configured to determine whether the first difference between the measured upstream pressure value and the model upstream pressure value is included in a trusted interval;
the third analysis module 206 determines that the EGR valve upstream pressure sensor is malfunctioning when the first difference is not included in the trusted interval.
It should be noted that, the first obtaining module 201 in this embodiment may be used to perform the above-mentioned step S10, the second obtaining module 202 in this embodiment may be used to perform the above-mentioned step S20, the first analyzing module 203 in this embodiment may be used to perform the above-mentioned step S30, the third obtaining module 204 in this embodiment may be used to perform the above-mentioned step S40, the second analyzing module 205 in this embodiment may be used to perform the above-mentioned step S50, and the third analyzing module 206 in this embodiment may be used to perform the above-mentioned step S60.
According to still another aspect of the embodiments of the present application, there is also provided a vehicle including a controller for executing the method for detecting the reliability of the EGR system upstream pressure sensor according to any of the embodiments described above.
It should be noted that, for simplicity of description, the foregoing method embodiments are all expressed as a series of action combinations, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required in the present application.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application and are intended to be comprehended within the scope of the present application.
Claims (10)
1. A method for detecting the reliability of an upstream pressure sensor of an EGR system, comprising:
acquiring the working condition of the EGR system;
when the working condition of the EGR system accords with a 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 an EGR valve based on the EGR model flow, the venturi upstream temperature, the venturi differential pressure, and a 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 upstream pressure model value is included in a trusted interval or not;
and when the first difference value is not included in the trusted interval, determining that the fault exists in the upstream pressure sensor of the EGR valve.
2. The method for detecting the reliability of an upstream pressure sensor of an EGR system according to claim 1, wherein the condition of the EGR system conforming to the preset condition includes:
acquiring a downstream pressure value of the EGR valve based on a downstream pressure sensor of the EGR valve;
judging whether a second difference value between the upstream pressure model value and the downstream pressure value is larger than a preset value or not;
and when the second difference value is larger than the preset value, determining that the working condition of the EGR system accords with the preset working condition.
3. The method of claim 1, wherein the determining an upstream pressure model value for an EGR valve based on the EGR model flow, the venturi upstream temperature, the venturi differential pressure, and a first pressure model comprises:
acquiring 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, the venturi upstream temperature, and the venturi differential pressure.
4. The method for detecting the reliability of an EGR system upstream pressure sensor according to claim 3, wherein the method for determining the EGR valve model flow rate includes:
acquiring total air inflow, air flow and gas flow;
the EGR valve model flow rate is determined based on the intake total flow rate, the air flow rate, and the gas flow rate.
5. The method for detecting the reliability of an EGR system upstream pressure sensor according to claim 4, wherein said obtaining the total amount of intake air includes:
acquiring an intake manifold pressure value, an engine speed and an intake manifold temperature of an engine;
the total intake air amount is determined based on the intake manifold pressure value, an engine speed, an intake manifold temperature, and a charge efficiency.
6. The method for detecting the reliability of an upstream pressure sensor of an EGR system according to claim 1, wherein the method for determining the value of the upstream pressure model further includes:
acquiring a downstream pressure value, a downstream temperature value, an EGR model flow and an EGR valve opening value of an EGR valve;
the upstream pressure model value is determined based on the downstream pressure value, the downstream temperature value, the EGR model flow, the EGR valve opening value, and the correction parameter.
7. The method of reliability detection for an EGR system upstream pressure sensor according to claim 6, wherein said determining said upstream pressure model value based on said downstream pressure value, downstream temperature value, EGR model flow, EGR valve opening value, and correction parameter comprises:
determining a second flow model of the EGR valve based on the downstream pressure value, the downstream temperature value, the EGR model flow, the EGR valve opening value, and the correction parameter;
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, the EGR valve opening value, and the correction parameter.
8. The method for detecting the reliability of an upstream pressure sensor of an EGR system according to claim 1, wherein the method for determining the value of the upstream pressure model further includes:
acquiring a pre-vortex pressure value, a pre-vortex temperature value and EGR model flow of a turbine;
the upstream pressure model value is determined based on a third pressure model, the pre-vortex pressure value, the pre-vortex temperature value, and the EGR model flow.
9. A reliability detection device of an EGR system upstream pressure sensor, characterized by comprising:
the first acquisition module acquires the working condition of the EGR system;
the second acquisition module is used for acquiring the temperature of the upstream of the venturi, the pressure difference of the venturi and the flow of the EGR valve model when the working condition of the EGR system accords with the preset working condition;
a first analysis module that determines an upstream pressure model value of an EGR valve based on the EGR model flow, the venturi upstream temperature, the venturi differential pressure, and a first pressure model;
the third acquisition module acquires an actual upstream pressure value of the EGR valve based on the upstream pressure sensor of the EGR valve;
the second analysis module is used for judging whether the first difference value between the actual upstream pressure value and the upstream pressure model value is included in a trusted interval or not;
and a third analysis module that determines that the EGR valve upstream pressure sensor is malfunctioning when the first difference is not included in the trusted interval.
10. A vehicle comprising a controller for executing the reliability detection method of the EGR system upstream pressure sensor according to any one of claims 1 to 8.
Priority Applications (1)
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| CN202310420857.8A CN116337328A (en) | 2023-04-14 | 2023-04-14 | Reliability detection method and device for upstream pressure sensor of EGR (exhaust gas Recirculation) system and vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116181509A (en) * | 2023-03-03 | 2023-05-30 | 潍柴动力股份有限公司 | Fault diagnosis method for upstream pressure sensor of EGR valve and vehicle |
| CN116907727A (en) * | 2023-09-12 | 2023-10-20 | 潍柴动力股份有限公司 | Method and device for detecting fault of pressure sensor before vortex, vehicle and storage medium |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116181509A (en) * | 2023-03-03 | 2023-05-30 | 潍柴动力股份有限公司 | Fault diagnosis method for upstream pressure sensor of EGR valve and vehicle |
| CN116181509B (en) * | 2023-03-03 | 2024-07-19 | 潍柴动力股份有限公司 | Fault diagnosis method for upstream pressure sensor of EGR valve and vehicle |
| CN116907727A (en) * | 2023-09-12 | 2023-10-20 | 潍柴动力股份有限公司 | Method and device for detecting fault of pressure sensor before vortex, vehicle and storage medium |
| CN116907727B (en) * | 2023-09-12 | 2024-01-12 | 潍柴动力股份有限公司 | Method and device for detecting fault of pressure sensor before vortex, vehicle and storage medium |
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