DPF differential pressure sensor hose installation error detection method and device and medium

Abstract

The invention discloses a DPF differential pressure sensor hose installation error detection method and device and a medium, and the method comprises the following steps: obtaining the front end temperature of a DPF in a vehicle operation state, and determining an exhaust flow value according to the front end temperature of the DPF; in response to the situation that the DPF differential pressure sensor is normal and the exhaust flow value is larger than a flow threshold value, the differential pressure value of the DPF differential pressure sensor is obtained; in response to the situation that the pressure difference value of the DPF pressure difference sensor is smaller than the pressure difference threshold value and the state duration is larger than or equal to the time threshold value, it is judged that the front hose and the rear hose of the vehicle pressure difference sensor are wrongly installed, the flow threshold value and the pressure difference threshold value are obtained according to DPF pressure difference sensor data of vehicles of the same type under three working conditions and an exhaust flow value determined by the DPF front end temperature at the same time. The flexible pipe installation error detection and judgment can be realized, the maintenance of the flexible pipe is prompted in time, and the influence on vehicle regeneration control and engine performance is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of DPF differential pressure sensor hose installation detection, and in particular relates to a DPF differential pressure sensor hose installation error detection method, device and medium. Background Art

[0002] To meet increasingly stringent environmental regulations, the diesel particulate filter (DPF) has become a key component in diesel engine emissions control. The DPF captures carbon particles from exhaust through physical filtration, but its filtration efficiency depends on its operating condition, and the differential pressure sensor is a core component for monitoring DPF health. The differential pressure sensor measures the pressure difference between the DPF inlet and outlet to determine the particulate matter load, trigger regeneration, and diagnose faults such as DPF blockage and damage. However, the hoses that monitor the DPF inlet and outlet pressures can sometimes be installed upside down after installation or repair, or the DPF inlet hose can become detached during vehicle use. This can cause the differential pressure signal to reverse, directly impacting regeneration control, fault diagnosis, and engine performance.

[0003] However, there is currently no effective way to monitor when the DPF inlet and outlet pressure hoses are installed upside down or the DPF inlet hose falls off, which affects regeneration control and engine performance. Summary of the Invention

[0004] In order to solve the problems of the prior art, the present invention provides a method, device and medium for detecting installation errors of a DPF differential pressure sensor hose.

[0005] The object of the present invention is achieved through the following technical solutions: A first aspect of the present invention discloses a method for detecting installation errors of a DPF differential pressure sensor hose, comprising the following steps: Get the DPF front temperature when the vehicle is running. Determining an exhaust flow value according to the DPF front end temperature; In response to the DPF differential pressure sensor being normal and the exhaust flow value being greater than a flow threshold, obtaining a differential pressure value of the DPF differential pressure sensor; In response to the pressure difference value of the DPF pressure difference sensor being less than the pressure difference threshold and the duration of this state being greater than or equal to the time threshold, it is determined that the front and rear hoses of the vehicle's pressure difference sensor are installed incorrectly, wherein the flow threshold and the pressure difference threshold are simultaneously obtained based on the DPF pressure difference sensor data of the same type of vehicle under three operating conditions and the exhaust flow value determined by the DPF front end temperature, the three operating conditions being an OBD cycle test under an empty DPF normally connected pipeline state, an empty pipe DPF normally connected pipeline state, and an empty DPF front and rear hose crossed state.

[0006] A second aspect of the present invention discloses a DPF differential pressure sensor hose installation error detection device, comprising a memory and a controller that are communicatively connected in sequence, wherein the memory stores a computer program, and the controller is used to read the computer program and execute the DPF differential pressure sensor hose installation error detection method described in the first aspect.

[0007] A third aspect of the present invention discloses a computer-readable storage medium having instructions stored thereon. When the instructions are executed on a computer, the method for detecting installation errors of a DPF differential pressure sensor hose described in the first aspect is executed.

[0008] The beneficial effects of the present invention are: The present invention detects and determines hose installation errors by comparing the DPF front end temperature and the pressure difference value of the DPF pressure difference sensor under vehicle operation state with test data, prompting timely maintenance of the hose and reducing the impact on vehicle regeneration control and engine performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 paying any creative work.

[0010] Figure 1 A flow chart of a method for detecting an installation error of a DPF differential pressure sensor hose according to the present invention; Figure 2 This is a characteristic diagram of exhaust flow and pressure difference obtained in a specific example. DETAILED DESCRIPTION

[0011] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0012] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0013] It should be noted that the embodiments and features in the present application can be combined with each other in the case of no conflict.

[0014] It should be noted that similar reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings.

[0015] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and thus cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0016] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0017] The first aspect of the present application discloses a DPF differential pressure sensor hose installation error detection method, which can be executed by a DPF differential pressure sensor hose installation error detection device, which can be software or a combination of software and hardware, and can be integrated on a smart mobile terminal, a tablet, a computer, a vehicle control terminal ECU. Specifically, as shown in the figure, the DPF differential pressure sensor hose installation error detection method comprises the following steps S01-S05. It should be noted that the step identifier in the present scheme is only for the convenience of describing the method, and does not constitute a sequence limitation, and the sequence of each step is subject to the language description, and the sequence of each signal is subject to the sequence. Figure 1

[0018] Step S01, acquiring the DPF front-end temperature under the vehicle operating state.

[0019] ​Step S02: determining the exhaust flow value according to the DPF front end temperature.

[0020] Specifically, the ECU can determine the exhaust flow value according to the DPF front-end temperature. This method is a prior art and will not be described in detail here.

[0021] Step S03: In response to the DPF differential pressure sensor being normal and the exhaust flow value being greater than a flow threshold, obtaining a differential pressure value of the DPF differential pressure sensor.

[0022] Here, the DPF differential pressure sensor is normal, which means that there is no fault in the DPF differential pressure sensor.

[0023] Step S04: In response to the pressure difference value of the DPF pressure difference sensor being less than the pressure difference threshold and the duration of this state being greater than or equal to the time threshold, it is determined that the front and rear hoses of the vehicle pressure difference sensor are installed incorrectly, wherein the flow threshold and the pressure difference threshold are simultaneously obtained based on the DPF pressure difference sensor data of the same type of vehicle under three operating conditions and the exhaust flow value determined by the DPF front end temperature, and the OBD cycle test is performed under the three operating conditions of no-load DPF normal connection pipeline state, empty pipe DPF normal connection pipeline state, and no-load DPF front and rear hose cross state.

[0024] The flow rate threshold in step S03 and the pressure differential threshold in this step are both derived through experimentation. Specifically, during the experiment, DPF pressure differential sensor data and the corresponding DPF front-end temperature were measured for the same type of vehicle under three operating conditions. The corresponding exhaust flow rate value was then determined from the DPF front-end temperature, using the same method as step S02. Uniplot software was then used to analyze the DPF pressure differential sensor data and exhaust flow rate values ​​to obtain the exhaust flow rate and pressure differential value characteristics under the three operating conditions. Finally, the flow rate threshold and pressure differential threshold were determined based on these characteristics, ensuring that the exhaust flow rate and pressure differential value characteristics for the three operating conditions did not overlap at the corresponding locations of the flow rate threshold and pressure differential threshold.

[0025] For example, taking SAIC Yuejin D30TCIF1 as an example, the exhaust flow and pressure difference characteristics under three working conditions obtained by the above test method are as follows: Figure 2 As shown in the figure, the blue area is the exhaust flow and pressure difference characteristics corresponding to the cross state of the front and rear hoses of the no-load DPF, the red area is the exhaust flow and pressure difference characteristics corresponding to the state of the DPF with the DPF normally connected to the pipe when the DPF is empty, and the green area is the exhaust flow and pressure difference characteristics corresponding to the state of the DPF with the DPF normally connected to the pipe when the DPF is empty. Figure 2 The exhaust flow rate and pressure difference characteristics shown in the figure determine the flow threshold and pressure difference threshold for this type of vehicle to be 300m 3 / h, -10hPa.

[0026] If the DPF differential pressure sensor's pressure differential value remains below the threshold for a period of time greater than or equal to the time threshold, a prompt message is generated to inform the driver that the front and rear hoses of the differential pressure sensor are incorrectly installed. Maintenance personnel can then follow this prompt to confirm that the hoses are installed incorrectly or the front hose is detached before repairing the system.

[0027] In this step, the time threshold is set to be greater than or equal to 4 seconds and less than or equal to 6 seconds. For example, it can be set to 4s, 5s, or 6s.

[0028] Step S05: In response to the pressure difference value of the DPF pressure difference sensor being less than the pressure difference threshold and the duration of this state being less than the time threshold or the pressure difference value of the DPF pressure difference sensor being greater than or equal to the pressure difference threshold, it is determined that the front and rear hoses of the vehicle pressure difference sensor are correctly installed.

[0029] The above method can be used to determine whether the front and rear hoses of the vehicle pressure differential sensor are installed correctly, so that maintenance personnel can maintain the front and rear hoses of the vehicle pressure differential sensor in a timely manner to reduce the impact on vehicle regeneration control and engine performance.

[0030] A second aspect of the present invention discloses a DPF differential pressure sensor hose installation error detection device, comprising a memory and a controller in communication with each other. The memory stores a computer program, and the controller is configured to read the computer program and execute the DPF differential pressure sensor hose installation error detection method described in the first aspect. Specifically, the memory may include, but is not limited to, random-access memory (RAM), read-only memory (ROM), flash memory, first-input first-output (FIFO), or first-input last-output (FILO) memory. The controller may be, but is not limited to, an STM32F105 series microcontroller. Furthermore, the computer device may include, but is not limited to, a power supply unit, a display screen, and other necessary components.

[0031] A third aspect of the present invention discloses a computer-readable storage medium having instructions stored thereon. When the instructions are executed on a computer, the method for detecting installation errors of a DPF differential pressure sensor hose described in the first aspect is executed.

[0032] The operating principles of the devices and systems disclosed in the second and third aspects of the present invention are detailed in the first aspect and will not be elaborated here.

[0033] Those skilled in the art will appreciate that the embodiments described herein are presented for purposes of illustration and that the inventive principles are not limited to these particular embodiments. Other variations and modifications can be made to the embodiments without departing from the spirit and scope of the inventive principles.

Claims

1. A method for detecting installation errors of a DPF differential pressure sensor hose, characterized in that: The following steps are involved: Get the DPF front temperature when the vehicle is running. Determining an exhaust flow value according to the DPF front end temperature; In response to the DPF differential pressure sensor being normal and the exhaust flow value being greater than a flow threshold, obtaining a differential pressure value of the DPF differential pressure sensor; In response to the pressure difference value of the DPF pressure difference sensor being less than the pressure difference threshold and the duration of this state being greater than or equal to the time threshold, it is determined that the front and rear hoses of the vehicle's pressure difference sensor are installed incorrectly, wherein the flow threshold and the pressure difference threshold are simultaneously obtained based on the DPF pressure difference sensor data of the same type of vehicle under three operating conditions and the exhaust flow value determined by the DPF front end temperature, the three operating conditions being an OBD cycle test under an empty DPF normally connected pipeline state, an empty pipe DPF normally connected pipeline state, and an empty DPF front and rear hose crossed state.

2. A method for detecting installation errors of a DPF differential pressure sensor hose according to claim 1, characterized in that: The flow rate threshold and the pressure difference threshold are obtained based on the DPF pressure difference sensor data of the same type of vehicle under three working conditions and the exhaust flow value determined by the DPF front end temperature, including: The test obtains the DPF differential pressure sensor data and corresponding DPF front-end temperature of the same type of vehicle under three working conditions; Determining an exhaust flow value according to the DPF front end temperature; Uniplot software was used to analyze the DPF differential pressure sensor data and exhaust flow values ​​to obtain the exhaust flow and differential pressure characteristics under three operating conditions. The flow rate threshold and the pressure difference threshold are determined according to the characteristics of the exhaust flow rate and the pressure difference value, so that the exhaust flow rate and the pressure difference value characteristics of the three working conditions at the corresponding positions of the flow rate threshold and the pressure difference threshold do not overlap.

3. The method for detecting installation errors of a DPF differential pressure sensor hose according to claim 1, characterized in that: After determining that the front and rear hoses of the vehicle differential pressure sensor are incorrectly installed, the method further includes: A prompt message is generated, wherein the prompt message is used to inform the driver that the front and rear hoses of the vehicle differential pressure sensor are installed incorrectly.

4. The method for detecting installation errors of a DPF differential pressure sensor hose according to claim 1, characterized in that: The time threshold is greater than or equal to 4 seconds and less than or equal to 6 seconds.

5. The method for detecting installation errors of a DPF differential pressure sensor hose according to claim 1, characterized in that: After obtaining the pressure difference value of the DPF pressure difference sensor, the method further includes: In response to the pressure difference value of the DPF pressure difference sensor being less than a pressure difference threshold and the duration of this state being less than a time threshold or the pressure difference value of the DPF pressure difference sensor being greater than or equal to the pressure difference threshold, it is determined that the front and rear hoses of the vehicle pressure difference sensor are correctly installed.

6. A DPF differential pressure sensor hose installation error detection device, comprising a memory and a controller in sequential communication connection, wherein the memory stores a computer program, characterized in that: The controller is used to read the computer program and execute the DPF differential pressure sensor hose installation error detection method according to any one of claims 1 to 5.

7. A computer-readable storage medium having instructions stored thereon, characterized in that: When the instructions are executed on a computer, the DPF differential pressure sensor hose installation error detection method according to any one of claims 1 to 5 is executed.

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