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 PDF

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CN116337328A
CN116337328A CN202310420857.8A CN202310420857A CN116337328A CN 116337328 A CN116337328 A CN 116337328A CN 202310420857 A CN202310420857 A CN 202310420857A CN 116337328 A CN116337328 A CN 116337328A
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value
model
egr
upstream
upstream pressure
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卫阳飞
徐帅卿
李军银
鲁成
李亮
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Weichai Power Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L27/00Testing or calibrating of apparatus for measuring fluid pressure
    • G01L27/007Malfunction diagnosis, i.e. diagnosing a sensor defect
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/40Engine management systems

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  • General Physics & Mathematics (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

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

EGR系统上游压力传感器的可信性检测方法、装置和车辆Plausibility detection method, device and vehicle for upstream pressure sensor of EGR system

技术领域technical field

本发明涉及车辆检测技术领域,具体涉及一种EGR系统上游压力传感器的可信性检测方法、装置和车辆。The invention relates to the technical field of vehicle detection, in particular to a reliability detection method, device and vehicle of an upstream pressure sensor of an EGR system.

背景技术Background technique

我国是汽车大国,随着人们生活水平的提高,汽车的排放也越来越受到重视。my country is a big country of automobiles. With the improvement of people's living standards, more and more attention has been paid to the emission of automobiles.

EGR系统通过将发动机排出的部分废气回送到进气歧管,并与新鲜混合气一起再次进入气缸。由于废气中含有大量的CO2等多原子气体,而CO2等气体不能燃烧却由于其比热容高而吸收大量的热,使气缸中混合气的最高燃烧温度降低,从而减少了NOx的生成量。因此,在EGR系统工作时,系统中工作部件,例如EGR阀上游压力传感器、下游压力传感器等检测部件的检测精度需要准确,对出现故障的工作部件,需要及时发现并进行维修或更换,避免检测偏差过大导致排放升高,不符合国标要求。The EGR system works by returning part of the exhaust gas from the engine to the intake manifold, where it re-enters the cylinders together with the fresh mixture. Because the exhaust gas contains a large amount of CO2 and other polyatomic gases, CO2 and other gases cannot be burned but absorb a large amount of heat due to their high specific heat capacity, which reduces the maximum combustion temperature of the mixture in the cylinder, thereby reducing the amount of NOx produced. Therefore, when the EGR system is working, the detection accuracy of the working parts in the system, such as the upstream pressure sensor and downstream pressure sensor of the EGR valve, needs to be accurate. For the working parts that have failed, they need to be found and repaired or replaced in time to avoid detection If the deviation is too large, the emission will increase, which does not meet the requirements of the national standard.

现有的一种针对EGR系统上游压力传感器的故障检测方案为在汽车处于熄火状态时进行故障检测,此方案只能检测0点的位置对应的上游压力传感器的检测精度,并不能确定上游压力传感器的特性曲线的斜率是否漂移,因此即使利用该方案确定出上游压力传感器无故障,但在其他工况下测试时,仍会出现上游压力传感器检测精度差的情况。An existing fault detection scheme for the upstream pressure sensor of the EGR system is to detect the fault when the car is in the flameout state. This scheme can only detect the detection accuracy of the upstream pressure sensor corresponding to the position of 0 o'clock, and cannot determine the upstream pressure sensor. Whether the slope of the characteristic curve drifts, so even if the scheme is used to determine that the upstream pressure sensor is not faulty, the detection accuracy of the upstream pressure sensor will still be poor when tested under other working conditions.

因此,如何提高EGR阀的上游压力传感器的可信性检测准确性的技术问题,亟待解决。Therefore, the technical problem of how to improve the reliability detection accuracy of the upstream pressure sensor of the EGR valve needs to be solved urgently.

发明内容Contents of the invention

为解决上述背景技术中阐述的如何检测EGR系统工作部件的工况的技术问题。本发明提出一种EGR系统上游压力传感器的可信性检测方法、装置和车辆。In order to solve the technical problem of how to detect the working conditions of the working parts of the EGR system described in the background art above. The invention provides a reliability detection method, device and vehicle of an upstream pressure sensor of an EGR system.

根据本申请实施例的一个方面,提供了一种EGR系统上游压力传感器的可信性检测方法,包括:获取所述EGR系统工况;在所述EGR系统工况符合预设工况时,获取文丘里上游温度、文丘里压差和EGR阀模型流量;基于所述EGR模型流量、所述文丘里上游温度、所述文丘里压差和第一压力模型确定EGR阀的上游压力模型值;基于EGR阀上游压力传感器获取EGR阀的上游压力实测值;判断所述上游压力实测值与所述上游压力模型值的第一差值是否包含于可信区间;在所述第一差值未包含于所述可信区间时,确定所述EGR阀上游压力传感器存在故障。According to an aspect of an embodiment of the present application, a method for detecting the reliability of an upstream pressure sensor of an EGR system is provided, including: acquiring the working condition of the EGR system; when the working condition of the EGR system conforms to a preset working condition, acquiring Venturi upstream temperature, Venturi differential pressure, and EGR valve model flow; determining an upstream pressure model value for the EGR valve based on the EGR model flow, the Venturi upstream temperature, the Venturi differential pressure, and a first pressure model; based on The upstream pressure sensor of the EGR valve obtains the measured value of the upstream pressure of the EGR valve; it is judged whether the first difference between the measured value of the upstream pressure and the model value of the upstream pressure is included in the credible interval; if the first difference is not included in the When the confidence interval is reached, it is determined that the pressure sensor upstream of the EGR valve has a fault.

可选地,所述EGR系统工况符合预设工况包括:基于EGR阀的下游压力传感器获取EGR阀的下游压力值;判断所述上游压力模型值与所述下游压力值的第二差值是否大于预设值;在所述第二差值大于所述预设值时,确定所述EGR系统工况符合所述预设工况。Optionally, the working condition of the EGR system conforming to the preset working condition includes: acquiring a downstream pressure value of the EGR valve based on a downstream pressure sensor of the EGR valve; judging a second difference between the upstream pressure model value and the downstream pressure value Whether it is greater than a preset value; when the second difference is greater than the preset value, it is determined that the working condition of the EGR system conforms to the preset working condition.

可选地,所述基于所述EGR模型流量、所述文丘里上游温度、所述文丘里压差和第一压力模型确定EGR阀的上游压力模型值包括:获取EGR阀的第一流量模型;基于所述第一流量模型和所述文丘里上游温度确定所述第一压力模型;基于所述第一压力模型、所述EGR模型流量、所述文丘里上游温度和所述文丘里压差确定所述上游压力模型值。Optionally, the determining the upstream pressure model value of the EGR valve based on the EGR model flow rate, the Venturi upstream temperature, the Venturi pressure difference and a first pressure model includes: obtaining a first flow rate model of the EGR valve; Determining the first pressure model based on the first flow model and the Venturi upstream temperature; determining based on the first pressure model, the EGR model flow, the Venturi upstream temperature and the Venturi differential pressure The upstream pressure model value.

可选地,所述EGR阀模型流量的确定方法包括:获取进气总流量、空气流量和燃气流量;基于所述进气总流量、所述空气流量和所述燃气流量确定所述EGR阀模型流量。Optionally, the method for determining the flow of the EGR valve model includes: obtaining the total intake flow, air flow and gas flow; determining the EGR valve model based on the total intake flow, the air flow and the gas flow flow.

可选地,所述获取进气总量包括:获取发动机的进气歧管压力值、发动机转速和进气歧管温度;基于所述进气歧管压力值、发动机转速、进气歧管温度和充气效率确定所述进气总量。Optionally, the obtaining the total amount of intake air includes: obtaining the intake manifold pressure value, engine speed and intake manifold temperature of the engine; based on the intake manifold pressure value, engine speed, intake manifold temperature and charging efficiency determine the total amount of intake air.

可选地,所述上游压力模型值的确定方法还包括:获取EGR阀的下游压力值、下游温度值、EGR模型流量和EGR阀开度值;基于所述下游压力值、下游温度值、EGR模型流量、EGR阀开度值和修正参数确定所述上游压力模型值。Optionally, the method for determining the upstream pressure model value further includes: obtaining the downstream pressure value, downstream temperature value, EGR model flow rate and EGR valve opening value of the EGR valve; based on the downstream pressure value, downstream temperature value, EGR Model flow, EGR valve opening value and correction parameters determine the upstream pressure model value.

可选地,所述基于所述下游压力值、下游温度值、EGR模型流量、EGR阀开度值和修正参数确定所述上游压力模型值包括:基于所述下游压力值、下游温度值、EGR模型流量、EGR阀开度值和修正参数确定EGR阀的第二流量模型;基于所述第二流量模型确定第二压力模型;基于所述第二压力模型、所述下游压力值、所述下游温度值、所述EGR模型流量、所述EGR阀开度值和所述修正参数确定所述上游压力模型值。Optionally, the determining the upstream pressure model value based on the downstream pressure value, downstream temperature value, EGR model flow rate, EGR valve opening value and correction parameters includes: based on the downstream pressure value, downstream temperature value, EGR Determine the second flow model of the EGR valve based on the model flow, the EGR valve opening value and the correction parameters; determine the second pressure model based on the second flow model; determine the second pressure model based on the second pressure model, the downstream pressure value, the downstream The temperature value, the EGR model flow rate, the EGR valve opening value and the correction parameter determine the upstream pressure model value.

可选地,所述上游压力模型值的确定方法还包括:获取涡轮机的涡前压力值、涡前温度值和EGR模型流量;基于第三压力模型、所述涡前压力值、所述涡前温度值和所述EGR模型流量确定所述上游压力模型值。Optionally, the method for determining the upstream pressure model value further includes: obtaining the pre-swirl pressure value, the pre-swirl temperature value and the EGR model flow rate of the turbine; The temperature value and the EGR model flow determine the upstream pressure model value.

根据本申请实施例的又一个方面,还提供了一种EGR系统上游压力传感器的可信性检测装置,包括:第一获取模块,获取所述EGR系统工况;第二获取模块,在所述EGR系统工况符合预设工况时,获取文丘里上游温度、文丘里压差和EGR阀模型流量;第一分析模块,基于所述EGR模型流量、所述文丘里上游温度、所述文丘里压差和第一压力模型确定EGR阀的上游压力模型值;第三获取模块,基于EGR阀上游压力传感器获取EGR阀的上游压力实测值;第二分析模块,判断所述上游压力实测值与所述上游压力模型值的第一差值是否包含于可信区间;第三分析模块,在所述第一差值未包含于所述可信区间时,确定所述EGR阀上游压力传感器存在故障。According to still another aspect of the embodiment of the present application, there is also provided a reliability detection device for an upstream pressure sensor of an EGR system, including: a first acquisition module, which acquires the working condition of the EGR system; a second acquisition module, which is configured in the When the working condition of the EGR system conforms to the preset working condition, the Venturi upstream temperature, the Venturi pressure difference and the EGR valve model flow are obtained; the first analysis module is based on the EGR model flow, the Venturi upstream temperature, the Venturi The pressure difference and the first pressure model determine the upstream pressure model value of the EGR valve; the third acquisition module obtains the measured value of the upstream pressure of the EGR valve based on the upstream pressure sensor of the EGR valve; the second analysis module judges that the measured value of the upstream pressure is consistent with the Whether the first difference of the upstream pressure model value is included in the credible interval; the third analysis module, when the first difference is not included in the credible interval, determines that there is a fault in the EGR valve upstream pressure sensor.

根据本申请实施例的又一个方面,还提供了一种车辆,包括控制器,所述控制器用于执行上述任意一项实施例所述的EGR系统上游压力传感器的可信性检测方法。According to still another aspect of the embodiments of the present application, there is also provided a vehicle, including a controller, the controller is configured to execute the method for detecting the reliability of the upstream pressure sensor of the EGR system described in any one of the above embodiments.

本申请中,在利用上游压力模型值判断上游压力传感器的检测精度时,需要保证上游压力模型值的可信程度较高,即EGR系统工况符合预设工况,通过对工况的要求,精确EGR阀的上游压力模型值,进而通过第一差值判断上游压力传感器是否发生故障,在第一差值不包含于可信区间时,表征此时上游压力传感器检测的上游压力实测值与上游压力模型值的偏差过大,即上游压力传感器的检测精度较低,此时确定上游压力传感器发生故障,在确定发生故障后,可以通过报警并记录故障代码的方式便于驾驶员察觉异常情况以及后续维修人员的维修,提高了允许进行上游压力传感器可信性检测的工况范围,进而提高EGR系统中相关参数如EGR率、EGR阀开度等参数的计算准确,提高EGR系统数据检测以及控制的准确性。In this application, when using the upstream pressure model value to judge the detection accuracy of the upstream pressure sensor, it is necessary to ensure that the upstream pressure model value has a high degree of credibility, that is, the working condition of the EGR system conforms to the preset working condition, and through the requirements of the working condition, Accurate the upstream pressure model value of the EGR valve, and then use the first difference to judge whether the upstream pressure sensor is faulty. The deviation of the pressure model value is too large, that is, the detection accuracy of the upstream pressure sensor is low. At this time, it is determined that the upstream pressure sensor is faulty. After the fault is determined, the driver can detect the abnormal situation and follow-up Maintenance by maintenance personnel improves the working condition range that allows the reliability detection of the upstream pressure sensor, thereby improving the calculation accuracy of relevant parameters in the EGR system such as EGR rate, EGR valve opening and other parameters, and improving the accuracy of EGR system data detection and control. accuracy.

附图说明Description of drawings

此处的附图被并入说明书中并构成本说明书的一部分,示出了符合本发明的实施例,并与说明书一起用于解释本发明的原理。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.

为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,对于本领域普通技术人员而言,在不付出创造性劳动性的前提下,还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, In other words, other drawings can also be obtained from these drawings without paying creative labor.

图1是根据本申请实施例的一种可选的EGR系统上游压力传感器的可信性检测方法的流程示意图;Fig. 1 is a schematic flow chart of an optional method for detecting the reliability of an upstream pressure sensor of an EGR system according to an embodiment of the present application;

图2是根据本申请实施例的一种可选的EGR系统上游压力传感器的可信性检测装置的结构框图。Fig. 2 is a structural block diagram of an optional device for detecting the reliability of an upstream pressure sensor of an EGR system according to an embodiment of the present application.

具体实施方式Detailed ways

为了使本技术领域的人员更好地理解本申请方案,下面将结合本申请实施例中的附图,对本申请实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本申请一部分的实施例,而不是全部的实施例。基于本申请中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都应当属于本申请保护的范围。In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

需要说明的是,本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象,而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换,以便这里描述的本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施。此外,术语“包括”和“具有”以及他们的任何变形,意图在于覆盖不排他的包含,例如,包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元,而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

正如背景技术所述,现有的一种针对EGR系统上游压力传感器的故障检测方案为在汽车处于熄火状态时进行故障检测,此方案只能检测0点的位置对应的上游压力传感器的检测精度,并不能确定上游压力传感器的特性曲线的斜率是否漂移,因此即使利用该方案确定出上游压力传感器无故障,但在其他工况下测试时,仍会出现上游压力传感器检测精度差的情况。As described in the background technology, an existing fault detection scheme for the upstream pressure sensor of the EGR system is to detect the fault when the car is in the flameout state. This scheme can only detect the detection accuracy of the upstream pressure sensor corresponding to the position of 0 o’clock. It is not possible to determine whether the slope of the characteristic curve of the upstream pressure sensor drifts, so even if the upstream pressure sensor is determined to be free of faults using this solution, the detection accuracy of the upstream pressure sensor will still be poor when tested under other working conditions.

因此,根据本申请实施例的一个方面,提供了一种EGR系统上游压力传感器的可信性检测方法,参见图1所示,该方法的流程可以包括以下步骤:Therefore, according to an aspect of the embodiment of the present application, a method for detecting the reliability of the upstream pressure sensor of the EGR system is provided. Referring to FIG. 1 , the flow of the method may include the following steps:

S10.获取所述EGR系统工况。S10. Obtain the working condition of the EGR system.

S20.在所述EGR系统工况符合预设工况时,获取文丘里上游温度、文丘里压差和EGR阀模型流量。S20. When the working condition of the EGR system conforms to the preset working condition, acquire the temperature upstream of the Venturi, the differential pressure of the Venturi and the flow rate of the EGR valve model.

S30.基于所述EGR模型流量、所述文丘里上游温度、所述文丘里压差和第一压力模型确定EGR阀的上游压力模型值。S30. Determine an upstream pressure model value of the EGR valve based on the EGR model flow rate, the Venturi upstream temperature, the Venturi pressure difference and a first pressure model.

S40.基于EGR阀上游压力传感器获取EGR阀的上游压力实测值。S40. Obtain an actual measured value of the upstream pressure of the EGR valve based on the upstream pressure sensor of the EGR valve.

S50.判断所述上游压力实测值与所述上游压力模型值的第一差值是否包含于可信区间。S50. Determine whether the first difference between the measured value of the upstream pressure and the model value of the upstream pressure is included in a credible interval.

S60.在所述第一差值未包含于所述可信区间时,确定所述EGR阀上游压力传感器存在故障。S60. When the first difference is not included in the credible interval, determine that there is a fault in the pressure sensor upstream of the EGR valve.

在本申请实施例中,在利用上游压力模型值判断上游压力传感器的检测精度时,需要保证上游压力模型值的可信程度较高,即EGR系统工况符合预设工况,通过对工况的要求,精确EGR阀的上游压力模型值,进而通过第一差值判断上游压力传感器是否发生故障,在第一差值不包含于可信区间时,表征此时上游压力传感器检测的上游压力实测值与上游压力模型值的偏差过大,即上游压力传感器的检测精度较低,此时确定上游压力传感器发生故障,在确定发生故障后,可以通过报警并记录故障代码的方式便于驾驶员察觉异常情况以及后续维修人员的维修,提高了允许进行上游压力传感器可信性检测的工况范围,进而提高EGR系统中相关参数如EGR率、EGR阀开度等参数的计算准确,提高EGR系统数据检测以及控制的准确性。In the embodiment of the present application, when using the upstream pressure model value to judge the detection accuracy of the upstream pressure sensor, it is necessary to ensure that the reliability of the upstream pressure model value is relatively high, that is, the working condition of the EGR system conforms to the preset working condition. According to the requirements, the upstream pressure model value of the EGR valve is accurate, and then the first difference is used to judge whether the upstream pressure sensor is faulty. When the first difference is not included in the credible interval, it represents the actual upstream pressure detected by the upstream pressure sensor at this time The deviation between the value and the upstream pressure model value is too large, that is, the detection accuracy of the upstream pressure sensor is low. At this time, it is determined that the upstream pressure sensor is faulty. After the fault is determined, the driver can detect the abnormality by alarming and recording the fault code. The situation and subsequent maintenance by maintenance personnel have improved the range of working conditions that allow the reliability detection of the upstream pressure sensor, thereby improving the calculation accuracy of relevant parameters in the EGR system such as EGR rate, EGR valve opening and other parameters, and improving the data detection of the EGR system. and control accuracy.

作为示例性的实施例,所述EGR系统工况符合预设工况包括:基于EGR阀的下游压力传感器获取EGR阀的下游压力值;判断所述上游压力模型值与所述下游压力值的第二差值是否大于预设值;在所述第二差值大于所述预设值时,确定所述EGR系统工况符合所述预设工况。As an exemplary embodiment, the working condition of the EGR system conforming to the preset working condition includes: obtaining the downstream pressure value of the EGR valve based on the downstream pressure sensor of the EGR valve; judging the upstream pressure model value and the downstream pressure value Whether the second difference is greater than a preset value; when the second difference is greater than the preset value, it is determined that the working condition of the EGR system conforms to the preset working condition.

在本实施例中,在利用第一差值判断上游压力传感器是否具有可信性即是否故障时,需要保证上游压力模型值的准确度,可以是在空气流量传感器、前氧传感器、EGR压差传感器均无故障,且发动机转速和EGR阀开度值分别保持在一定值时,进行上游压力模型值的计算。其中,发动机转速对应的定值和EGR阀开度值对应的定值可以通过台架试验确定。通过对上游压力模型值计算是的工况条件约束,能进一步提高上游压力传感器可信性检测的准确性。In this embodiment, when using the first difference to judge whether the upstream pressure sensor is credible, that is, whether it is faulty, it is necessary to ensure the accuracy of the upstream pressure model value, which can be in the air flow sensor, front oxygen sensor, EGR differential pressure When the sensors have no faults, and the engine speed and the EGR valve opening are kept at a certain value, the calculation of the upstream pressure model value is carried out. Wherein, the fixed value corresponding to the engine speed and the fixed value corresponding to the EGR valve opening value can be determined through a bench test. By constraining the working conditions of the calculation of the upstream pressure model value, the accuracy of the reliability detection of the upstream pressure sensor can be further improved.

作为示例性的实施例,所述基于所述EGR模型流量、所述文丘里上游温度、所述文丘里压差和第一压力模型确定EGR阀的上游压力模型值包括:获取EGR阀的第一流量模型;基于所述第一流量模型和所述文丘里上游温度确定所述第一压力模型;基于所述第一压力模型、所述EGR模型流量、所述文丘里上游温度和所述文丘里压差确定所述上游压力模型值。As an exemplary embodiment, the determining the upstream pressure model value of the EGR valve based on the EGR model flow rate, the Venturi upstream temperature, the Venturi pressure difference and the first pressure model includes: obtaining the first EGR valve flow model; determining said first pressure model based on said first flow model and said Venturi upstream temperature; based on said first pressure model, said EGR model flow, said Venturi upstream temperature and said Venturi The differential pressure determines the upstream pressure model value.

在本实施例中,在具有文丘里结构的EGR系统中,通过第一流量模型以及文丘里上游温度进行相应转换,能得出第一流量模型,参见下式(1)所示为第一流量模型:In this embodiment, in the EGR system with Venturi structure, the first flow model can be obtained through the corresponding conversion of the first flow model and the temperature upstream of the Venturi, as shown in the following formula (1) as the first flow Model:

Figure BDA0004186803120000081
Figure BDA0004186803120000081

其中,β为文丘里喉口直径与文丘里上游位置直径的比值,AEGR为文丘里喉口面积,ε为可压缩系数,ρ1为文丘里上游气体的密度,p1为文丘里上游气体的压力值,p2指文丘里喉口气体的压力,k1为常数,Δp为文丘里压差。ρ1可由p1、T1结合状态方程得到,p2指文丘里喉口气体的压力,可以通过p1-Δp计算得到,k1可以通过试验确定,Δp为文丘里压差传感器测得的值,ε可由β、p1、p2表示,参见式(2)所示:Among them, β is the ratio of Venturi throat diameter to Venturi upstream position diameter, A EGR is Venturi throat area, ε is compressibility coefficient, ρ 1 is density of gas upstream of Venturi, p 1 is gas upstream of Venturi The pressure value, p 2 refers to the pressure of the venturi throat gas, k 1 is a constant, Δp is the Venturi pressure difference. ρ 1 can be obtained by combining p 1 and T 1 with the state equation, p 2 refers to the pressure of the venturi throat gas, which can be calculated by p 1 -Δp, k 1 can be determined through experiments, and Δp is measured by the Venturi differential pressure sensor value, ε can be represented by β, p 1 , p 2 , see formula (2):

Figure BDA0004186803120000091
Figure BDA0004186803120000091

其中,k为热力学常数,以上式(1)-(2)经过转换,并结合状态方程将ρ1转换为P1和T1的形式,即可得出第一压力模型,如下式(3)所示:Among them, k is a thermodynamic constant, the above formulas (1)-(2) are converted, and combined with the state equation to convert ρ1 into the form of P1 and T1, the first pressure model can be obtained, as shown in the following formula (3) :

Figure BDA0004186803120000092
Figure BDA0004186803120000092

其中,ε(t-1)为上一时刻的ε值,k2为常数。基于此,即可通过EGR模型流量、文丘里上游温度和文丘里压差计算出EGR阀上游压力模型值。Among them, ε (t-1) is the value of ε at the previous moment, and k 2 is a constant. Based on this, the EGR valve upstream pressure model value can be calculated from the EGR model flow rate, the Venturi upstream temperature and the Venturi pressure difference.

作为示例性的实施例,所述EGR阀模型流量的确定方法包括:获取进气总流量、空气流量和燃气流量;基于所述进气总流量、所述空气流量和所述燃气流量确定所述EGR阀模型流量。所述获取进气总量包括:获取发动机的进气歧管压力值、发动机转速和进气歧管温度;基于所述进气歧管压力值、发动机转速、进气歧管温度和充气效率确定所述进气总量。As an exemplary embodiment, the method for determining the flow rate of the EGR valve model includes: obtaining the total intake flow rate, air flow rate and gas flow rate; determining the EGR valve model flow. The obtaining the total amount of intake air includes: obtaining the intake manifold pressure value, engine speed and intake manifold temperature of the engine; determining the intake manifold pressure value, engine speed, intake manifold temperature and charging efficiency The total amount of intake air.

在本实施例中,进气总量可以通过下式(4)计算得到:In this embodiment, the total amount of intake air can be calculated by the following formula (4):

Figure BDA0004186803120000101
Figure BDA0004186803120000101

其中,mfTotal为进气总量,n为发动机转速,可以通过ECU直接读取得到,MAP为发动机的进气歧管压力,可以通过进气歧管压力传感器检测,MAT为发动机的进气歧管温度,可以通过进气歧管温度传感器检测,k3为充气效率,可以在台架试验上提前标定得到。Among them, mfTotal is the total amount of intake air, n is the engine speed, which can be directly read by the ECU, MAP is the intake manifold pressure of the engine, which can be detected by the intake manifold pressure sensor, and MAT is the intake manifold of the engine The temperature can be detected by the intake manifold temperature sensor, and k 3 is the inflation efficiency, which can be calibrated in advance on the bench test.

在确定了进气总量后,即可进行EGR阀模型流量的计算,参见下式(5)所示:After the total amount of intake air is determined, the EGR valve model flow can be calculated, as shown in the following formula (5):

mfEGR=mfTotal-mfAir-mfNG (5)mfEGR=mfTotal-mfAir-mfNG (5)

其中,mfEGR为EGR阀模型流量,mfTotal为进气总量,mfAir为空气流量,可以通过空气流量计检测,mfNG为燃气流量,ECU可以通过读取喷油量进行计算得到。Among them, mfEGR is the flow rate of the EGR valve model, mfTotal is the total amount of intake air, mfAir is the air flow rate, which can be detected by the air flow meter, and mfNG is the gas flow rate, which can be calculated by the ECU by reading the fuel injection volume.

作为示例性的实施例,所述上游压力模型值的确定方法还包括:获取EGR阀的下游压力值、下游温度值、EGR模型流量和EGR阀开度值;基于所述下游压力值、下游温度值、EGR模型流量、EGR阀开度值和修正参数确定所述上游压力模型值。所述基于所述下游压力值、下游温度值、EGR模型流量、EGR阀开度值和修正参数确定所述上游压力模型值包括:基于所述下游压力值、下游温度值、EGR模型流量、EGR阀开度值和修正参数确定EGR阀的第二流量模型;基于所述第二流量模型确定第二压力模型;基于所述第二压力模型、所述下游压力值、所述下游温度值、所述EGR模型流量、所述EGR阀开度值和所述修正参数确定所述上游压力模型值。As an exemplary embodiment, the method for determining the upstream pressure model value further includes: acquiring a downstream pressure value, a downstream temperature value, an EGR model flow rate, and an EGR valve opening value of the EGR valve; value, EGR model flow rate, EGR valve opening value and correction parameters determine the upstream pressure model value. The determining the upstream pressure model value based on the downstream pressure value, downstream temperature value, EGR model flow rate, EGR valve opening value and correction parameters includes: based on the downstream pressure value, downstream temperature value, EGR model flow rate, EGR The valve opening value and the correction parameter determine the second flow model of the EGR valve; determine the second pressure model based on the second flow model; determine the second pressure model based on the second pressure model, the downstream pressure value, the downstream temperature value, the The upstream pressure model value is determined based on the EGR model flow rate, the EGR valve opening value and the correction parameter.

在本实施例中,对于无文丘里结构的EGR系统,可以基于EGR阀模型流量与EGR阀的下游压力值、下游温度值、EGR阀开度值和EGR阀的上游压力模型值的脉谱图进行查表确定,即参见下式(6)所示:In this embodiment, for the EGR system without Venturi structure, it can be based on the map of the EGR valve model flow rate and the downstream pressure value of the EGR valve, the downstream temperature value, the EGR valve opening value and the upstream pressure model value of the EGR valve Carry out look-up table and determine, promptly see shown in following formula (6):

Figure BDA0004186803120000111
Figure BDA0004186803120000111

其中,mfegr为EGR模型流量,T3为EGR阀下游温度值,p3为EGR阀下游压力值,p1为EGR阀上游压力模型值,M为EGR阀开度值,f1、f2、f3、f4为由脉谱图转化成的与EGR模型流量的对应固定关系,f5为修正参数,可以通过试验获得。基于脉谱图与式(6)即可确定出EGR阀的上游压力模型值,进而在EGR系统工况符合预设工况时,进行EGR阀的上游压力传感器的可信性检测。Among them, mf egr is the EGR model flow rate, T 3 is the downstream temperature value of the EGR valve, p 3 is the downstream pressure value of the EGR valve, p 1 is the upstream pressure model value of the EGR valve, M is the EGR valve opening value, f1, f2, f3 , f4 is the corresponding fixed relationship converted from the map and the flow rate of the EGR model, and f5 is the correction parameter, which can be obtained through experiments. Based on the map and formula (6), the upstream pressure model value of the EGR valve can be determined, and then the credibility of the upstream pressure sensor of the EGR valve can be tested when the working condition of the EGR system conforms to the preset working condition.

作为示例性的实施例,所述上游压力模型值的确定方法还包括:获取涡轮机的涡前压力值、涡前温度值和EGR模型流量;基于第三压力模型、所述涡前压力值、所述涡前温度值和所述EGR模型流量确定所述上游压力模型值。As an exemplary embodiment, the method for determining the value of the upstream pressure model further includes: obtaining the pre-swirl pressure value, the pre-swirl temperature value and the EGR model flow rate of the turbine; based on the third pressure model, the pre-swirl pressure value, the The pre-swirl temperature value and the EGR model flow rate determine the upstream pressure model value.

在本实施例中,上游压力模型值的确定方式还可以是基于涡轮机的涡前压力值、涡前温度值、EGR模型流量,并结合流体力学基本公式确定,即第三压力模型,参见下式(7)所示:In this embodiment, the determination method of the upstream pressure model value can also be based on the pre-vortex pressure value of the turbine, the pre-vortex temperature value, and the EGR model flow rate, combined with the basic formula of fluid mechanics, that is, the third pressure model, see the following formula As shown in (7):

Figure BDA0004186803120000112
Figure BDA0004186803120000112

其中,P1为上游压力模型值,P0为涡前压力值,mfEGR为EGR模型流量,T0为涡前温度值,

Figure BDA0004186803120000113
为基于EGR模型流量和涡前温度值的二维插值表,对应关系通过实验得到。Among them, P 1 is the upstream pressure model value, P 0 is the pre-vortex pressure value, mfEGR is the EGR model flow rate, T 0 is the pre-vortex temperature value,
Figure BDA0004186803120000113
It is a two-dimensional interpolation table based on the EGR model flow rate and the temperature value before the vortex, and the corresponding relationship is obtained through experiments.

本申请中,可以基于不同的EGR系统以及能够获取或计算的不同的参数选择相应的压力模型进行上游压力模型值的计算,并在EGR系统工况符合预设工况时进行上游压力传感器的可信性检测,增加了上游压力传感器的可信性检测的工况范围,能够更加准确的检测上游压力传感器是否发生故障。In this application, the corresponding pressure model can be selected based on different EGR systems and different parameters that can be obtained or calculated to calculate the value of the upstream pressure model, and the upstream pressure sensor can be adjusted when the working condition of the EGR system meets the preset working condition. The reliability detection increases the working condition range of the reliability detection of the upstream pressure sensor, and can more accurately detect whether the upstream pressure sensor fails.

根据本申请实施例的另一个方面,提供了一种EGR系统上游压力传感器的可信性检测装置,参见图2所示,包括:According to another aspect of the embodiment of the present application, a reliability detection device for an upstream pressure sensor of an EGR system is provided, as shown in FIG. 2 , including:

第一获取模块201,获取所述EGR系统工况;The first acquiring module 201, acquires the working condition of the EGR system;

第二获取模块202,在所述EGR系统工况符合预设工况时,获取文丘里上游温度、文丘里压差和EGR阀模型流量;The second acquisition module 202, when the working condition of the EGR system conforms to the preset working condition, acquires the Venturi upstream temperature, the Venturi pressure difference and the EGR valve model flow rate;

第一分析模块203,基于所述EGR模型流量、所述文丘里上游温度、所述文丘里压差和第一压力模型确定EGR阀的上游压力模型值;The first analysis module 203, based on the EGR model flow rate, the Venturi upstream temperature, the Venturi pressure difference and the first pressure model to determine the upstream pressure model value of the EGR valve;

第三获取模块204,基于EGR阀上游压力传感器获取EGR阀的上游压力实测值;The third obtaining module 204, obtains the measured value of the upstream pressure of the EGR valve based on the upstream pressure sensor of the EGR valve;

第二分析模块205,判断所述上游压力实测值与所述上游压力模型值的第一差值是否包含于可信区间;The second analysis module 205, judges whether the first difference between the measured value of the upstream pressure and the model value of the upstream pressure is included in the credible interval;

第三分析模块206,在所述第一差值未包含于所述可信区间时,确定所述EGR阀上游压力传感器存在故障。The third analysis module 206 determines that the pressure sensor upstream of the EGR valve has a fault when the first difference is not included in the confidence interval.

需要说明的是,该实施例中的第一获取模块201可以用于执行上述步骤S10,该实施例中的第二获取模块202可以用于执行上述步骤S20,该实施例中的第一分析模块203可以用于执行上述步骤S30,该实施例中的第三获取模块204可以用于执行上述步骤S40,该实施例中的第二分析模块205可以用于执行上述步骤S50,该实施例中的第三分析模块206可以用于执行上述步骤S60。It should be noted that the first acquisition module 201 in this embodiment can be used to perform the above step S10, the second acquisition module 202 in this embodiment can be used to perform the above step S20, the first analysis module in this embodiment 203 can be used to perform the above step S30, the third acquisition module 204 in this embodiment can be used to perform the above step S40, the second analysis module 205 in this embodiment can be used to perform the above step S50, in this embodiment The third analysis module 206 may be used to execute the above step S60.

根据本申请实施例的再一个方面,还提供了一种车辆,包括控制器,所述控制器用于执行上述任意一项实施例所述的EGR系统上游压力传感器的可信性检测方法。According to still another aspect of the embodiments of the present application, there is also provided a vehicle, including a controller, the controller is configured to execute the method for detecting the reliability of the upstream pressure sensor of the EGR system described in any one of the above embodiments.

需要说明的是,对于前述的各方法实施例,为了简单描述,故将其都表述为一系列的动作组合,但是本领域技术人员应该知悉,本申请并不受所描述的动作顺序的限制,因为依据本申请,某些步骤可以采用其他顺序或者同时进行。其次,本领域技术人员也应该知悉,说明书中所描述的实施例均属于优选实施例,所涉及的动作和模块并不一定是本申请所必须的。It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the described action sequence. Depending on the application, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by this application.

以上仅是本申请的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本申请原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本申请的保护范围。The above are only the preferred embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the principle of the application, and these improvements and modifications should also be considered as For the scope of protection of this application.

Claims (10)

1.一种EGR系统上游压力传感器的可信性检测方法,其特征在于,包括:1. A plausibility detection method of an EGR system upstream pressure sensor, characterized in that, comprising: 获取所述EGR系统工况;Obtain the working condition of the EGR system; 在所述EGR系统工况符合预设工况时,获取文丘里上游温度、文丘里压差和EGR阀模型流量;When the working condition of the EGR system conforms to the preset working condition, the Venturi upstream temperature, the Venturi pressure difference and the EGR valve model flow rate are obtained; 基于所述EGR模型流量、所述文丘里上游温度、所述文丘里压差和第一压力模型确定EGR阀的上游压力模型值;determining an upstream pressure model value for an EGR valve based on the EGR model flow rate, the Venturi upstream temperature, the Venturi differential pressure, and a first pressure model; 基于EGR阀上游压力传感器获取EGR阀的上游压力实测值;Acquiring the measured value of the upstream pressure of the EGR valve based on the upstream pressure sensor of the EGR valve; 判断所述上游压力实测值与所述上游压力模型值的第一差值是否包含于可信区间;judging whether the first difference between the measured upstream pressure value and the upstream pressure model value is included in a credible interval; 在所述第一差值未包含于所述可信区间时,确定所述EGR阀上游压力传感器存在故障。When the first difference is not included in the confidence interval, it is determined that the EGR valve upstream pressure sensor has a fault. 2.如权利要求1所述的EGR系统上游压力传感器的可信性检测方法,其特征在于,所述EGR系统工况符合预设工况包括:2. The method for detecting the reliability of the upstream pressure sensor of the EGR system according to claim 1, wherein the EGR system working condition conforming to the preset working condition comprises: 基于EGR阀的下游压力传感器获取EGR阀的下游压力值;Obtain the downstream pressure value of the EGR valve based on the downstream pressure sensor of the EGR valve; 判断所述上游压力模型值与所述下游压力值的第二差值是否大于预设值;judging whether a second difference between the upstream pressure model value and the downstream pressure value is greater than a preset value; 在所述第二差值大于所述预设值时,确定所述EGR系统工况符合所述预设工况。When the second difference is greater than the preset value, it is determined that the working condition of the EGR system complies with the preset working condition. 3.如权利要求1所述的EGR系统上游压力传感器的可信性检测方法,其特征在于,所述基于所述EGR模型流量、所述文丘里上游温度、所述文丘里压差和第一压力模型确定EGR阀的上游压力模型值包括:3. The plausibility detection method of EGR system upstream pressure sensor as claimed in claim 1, is characterized in that, described based on described EGR model flow rate, described Venturi upstream temperature, described Venturi differential pressure and first The pressure model determines the upstream pressure model values of the EGR valve including: 获取EGR阀的第一流量模型;obtaining a first flow model of the EGR valve; 基于所述第一流量模型和所述文丘里上游温度确定所述第一压力模型;determining the first pressure model based on the first flow model and the Venturi upstream temperature; 基于所述第一压力模型、所述EGR模型流量、所述文丘里上游温度和所述文丘里压差确定所述上游压力模型值。The upstream pressure model value is determined based on the first pressure model, the EGR model flow rate, the Venturi upstream temperature, and the Venturi differential pressure. 4.如权利要求3所述的EGR系统上游压力传感器的可信性检测方法,其特征在于,所述EGR阀模型流量的确定方法包括:4. the plausibility detection method of EGR system upstream pressure sensor as claimed in claim 3, is characterized in that, the determining method of described EGR valve model flow comprises: 获取进气总流量、空气流量和燃气流量;Obtain the total intake air flow, air flow and gas flow; 基于所述进气总流量、所述空气流量和所述燃气流量确定所述EGR阀模型流量。The EGR valve model flow is determined based on the intake total flow, the air flow, and the gas flow. 5.如权利要求4所述的EGR系统上游压力传感器的可信性检测方法,其特征在于,所述获取进气总量包括:5. The authenticity detection method of the EGR system upstream pressure sensor as claimed in claim 4, is characterized in that, said obtaining intake air total amount comprises: 获取发动机的进气歧管压力值、发动机转速和进气歧管温度;Obtain the intake manifold pressure value, engine speed and intake manifold temperature of the engine; 基于所述进气歧管压力值、发动机转速、进气歧管温度和充气效率确定所述进气总量。The intake air amount is determined based on the intake manifold pressure value, engine speed, intake manifold temperature and charging efficiency. 6.如权利要求1所述的EGR系统上游压力传感器的可信性检测方法,其特征在于,所述上游压力模型值的确定方法还包括:6. the plausibility detection method of EGR system upstream pressure sensor as claimed in claim 1, is characterized in that, the determination method of described upstream pressure model value also comprises: 获取EGR阀的下游压力值、下游温度值、EGR模型流量和EGR阀开度值;Obtain the downstream pressure value, downstream temperature value, EGR model flow rate and EGR valve opening value of the EGR valve; 基于所述下游压力值、下游温度值、EGR模型流量、EGR阀开度值和修正参数确定所述上游压力模型值。The upstream pressure model value is determined based on the downstream pressure value, downstream temperature value, EGR model flow rate, EGR valve opening value and correction parameters. 7.如权利要求6所述的EGR系统上游压力传感器的可信性检测方法,其特征在于,所述基于所述下游压力值、下游温度值、EGR模型流量、EGR阀开度值和修正参数确定所述上游压力模型值包括:7. The authenticity detection method of the EGR system upstream pressure sensor as claimed in claim 6, is characterized in that, described based on described downstream pressure value, downstream temperature value, EGR model flow rate, EGR valve opening degree value and correction parameter Determining said upstream pressure model value includes: 基于所述下游压力值、下游温度值、EGR模型流量、EGR阀开度值和修正参数确定EGR阀的第二流量模型;determining a second flow model of the EGR valve based on the downstream pressure value, downstream temperature value, EGR model flow rate, EGR valve opening value and correction parameters; 基于所述第二流量模型确定第二压力模型;determining a second pressure model based on the second flow model; 基于所述第二压力模型、所述下游压力值、所述下游温度值、所述EGR模型流量、所述EGR阀开度值和所述修正参数确定所述上游压力模型值。The upstream pressure model value is determined based on the second pressure model, the downstream pressure value, the downstream temperature value, the EGR model flow rate, the EGR valve opening value, and the correction parameter. 8.如权利要求1所述的EGR系统上游压力传感器的可信性检测方法,其特征在于,所述上游压力模型值的确定方法还包括:8. The plausibility detection method of EGR system upstream pressure sensor as claimed in claim 1, is characterized in that, the determination method of described upstream pressure model value also comprises: 获取涡轮机的涡前压力值、涡前温度值和EGR模型流量;Obtain the pre-vortex pressure value, pre-vortex temperature value and EGR model flow of the turbine; 基于第三压力模型、所述涡前压力值、所述涡前温度值和所述EGR模型流量确定所述上游压力模型值。The upstream pressure model value is determined based on a third pressure model, the pre-swirl pressure value, the pre-swirl temperature value, and the EGR model flow rate. 9.一种EGR系统上游压力传感器的可信性检测装置,其特征在于,包括:9. A reliability detection device for an upstream pressure sensor of an EGR system, characterized in that it comprises: 第一获取模块,获取所述EGR系统工况;A first acquisition module, for acquiring the working condition of the EGR system; 第二获取模块,在所述EGR系统工况符合预设工况时,获取文丘里上游温度、文丘里压差和EGR阀模型流量;The second acquisition module, when the working condition of the EGR system conforms to the preset working condition, acquires the Venturi upstream temperature, the Venturi pressure difference and the EGR valve model flow rate; 第一分析模块,基于所述EGR模型流量、所述文丘里上游温度、所述文丘里压差和第一压力模型确定EGR阀的上游压力模型值;A first analysis module, based on the EGR model flow rate, the Venturi upstream temperature, the Venturi pressure difference and a first pressure model to determine the upstream pressure model value of the EGR valve; 第三获取模块,基于EGR阀上游压力传感器获取EGR阀的上游压力实测值;The third obtaining module obtains the measured value of the upstream pressure of the EGR valve based on the upstream pressure sensor of the EGR valve; 第二分析模块,判断所述上游压力实测值与所述上游压力模型值的第一差值是否包含于可信区间;The second analysis module judges whether the first difference between the measured value of the upstream pressure and the model value of the upstream pressure is included in the credible interval; 第三分析模块,在所述第一差值未包含于所述可信区间时,确定所述EGR阀上游压力传感器存在故障。A third analysis module, when the first difference is not included in the confidence interval, determines that there is a fault in the pressure sensor upstream of the EGR valve. 10.一种车辆,其特征在于,包括控制器,所述控制器用于执行如权利要求1-8任意一项所述的EGR系统上游压力传感器的可信性检测方法。10. A vehicle, characterized by comprising a controller, the controller being used to execute the method for detecting the reliability of the upstream pressure sensor of the EGR system according to any one of claims 1-8.
CN202310420857.8A 2023-04-14 2023-04-14 Reliability detection method and device for upstream pressure sensor of EGR (exhaust gas Recirculation) system and vehicle Pending CN116337328A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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 Vortex pressure sensor fault detection method, device, vehicle and storage medium

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