Gpf failure simulation diagnosis device and method

Abstract

The application provides a GPF fault simulation diagnosis device and method, which comprises: an air inlet pipe, one end of the air inlet pipe is communicated with an upstream pressure pipeline of a differential pressure sensor, the other end is communicated with an upstream pressure pipeline of a GPF, and a valve one is arranged on the air inlet pipe; an air outlet pipe, one end of the air outlet pipe is communicated with a downstream pressure pipeline of the differential pressure sensor, the other end is communicated with a downstream pressure pipeline of the GPF, and a valve two is arranged on the air outlet pipe; and an adjusting pipe, one end of the adjusting pipe is communicated with the upstream pressure pipeline of the differential pressure sensor, the other end is communicated with the downstream pressure pipeline of the differential pressure sensor, and a valve three is arranged on the adjusting pipe. The application has the beneficial effects that: the vehicle to be detected is in a diagnosis working condition, the opening degree of the valve three is adjusted, and it can be determined whether the OBD can monitor the working state of the GPF, compared with installing a GPF fault part, the process of fault simulation is simplified, and the efficiency of the fault diagnosis process is improved.

Description

Technical Field

[0001] This invention belongs to the field of GPF fault diagnosis technology, and in particular relates to a GPF fault simulation diagnosis device and method. Background Technology

[0002] The Gas Filter (GPF), installed in the engine exhaust system, is a crucial means of controlling particulate matter generated by the engine. As engine exhaust passes through the GPF, particulate matter is captured and decomposed at high temperatures, thus reducing the particulate matter content in the exhaust. Clogged or damaged GPF components can affect vehicle exhaust emission levels. Therefore, the China VI emission regulations for light-duty vehicles require that the OBD system be able to monitor for GPF malfunctions.

[0003] One current method for OBD monitoring of the GPF (Gas Pressure Filter) is to install a differential pressure sensor. By monitoring the pressure difference between the upstream and downstream of the GPF, under suitable engine operating conditions, it can determine whether the GPF has been damaged (the pressure difference decreases). Another method to test the effectiveness of the monitoring system is to replace it with a faulty component, such as using an exhaust pipe without a GPF to simulate GPF removal or artificially blocking the GPF. However, this method has the following problems: while a real faulty component best reflects the actual fault state and allows developers to set the monitoring system to the appropriate settings, installing and removing the faulty component is time-consuming and labor-intensive, transportation is difficult, and manufacturing a faulty component requires damaging the original GPF, which is costly. Summary of the Invention

[0004] In view of this, the present invention aims to provide a GPF fault simulation diagnostic device and method, in order to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] The first aspect of the present invention provides a GPF fault simulation diagnostic device, comprising:

[0007] An air intake pipe, one end of which is connected to the upstream pressure line of the differential pressure sensor and the other end of which is connected to the upstream pressure line of the GPF, and a valve is provided on the air intake pipe;

[0008] An exhaust pipe, one end of which is connected to the downstream pressure line of the differential pressure sensor and the other end of which is connected to the downstream pressure line of the GPF, and a valve 2 is provided on the exhaust pipe;

[0009] The regulating pipe has one end connected to the upstream pressure line of the differential pressure sensor and the other end connected to the downstream pressure line of the differential pressure sensor. The regulating pipe is equipped with valve three.

[0010] Furthermore, valves one, two, and three are all butterfly valves with adjustable opening angles.

[0011] Furthermore, the inner diameters of the intake pipe, exhaust pipe, and regulating pipe are connected, and the inner diameter of the butterfly valve seat is the same as the inner diameter of the intake pipe.

[0012] Furthermore, the GPF fault diagnosis device also includes a calibration differential pressure sensor, one end of which is connected to the upstream pressure line of the differential pressure sensor, and the other end is connected to the downstream pressure line of the differential pressure sensor.

[0013] A second aspect of the present invention provides a method for using the GPF fault diagnosis device described in the first aspect, characterized by comprising the following steps:

[0014] S1. Confirm that the vehicle's GPF is in normal working condition;

[0015] S2. Fully open valve one and valve two, partially open valve three;

[0016] S3. Start the vehicle and keep it idling for a standard time. Then, press the accelerator pedal and check if the OBD reports a "particulate matter trap removed" fault.

[0017] If the OBD reports a "particulate filter removed" fault, it is determined that the OBD can monitor the working status of the GPF.

[0018] Furthermore, if the OBD does not report a "particulate matter trap removed" fault in step S3, then proceed to step S4;

[0019] S4. Drive the vehicle, repeatedly accelerating and decelerating between the first and second speeds. After driving for a standard time, check if the OBD reports a "particulate matter trap removed" fault.

[0020] If the OBD reports a "particulate matter trap removed" fault, it is determined that the OBD can monitor the working status of the GPF.

[0021] If the OBD does not report a "particulate matter trap removed" fault, proceed to step S5;

[0022] S5. Increase the opening of valve three, or simultaneously decrease the opening of valve one and valve two, and repeat steps S3-S4 until the opening of valve three is at its maximum.

[0023] If the OBD reports a "particulate matter trap removed" fault when valve three is in any opening position, it is determined that the OBD can monitor the working status of the GPF.

[0024] If the OBD does not report a "particulate matter trap removed" fault at any of the valve opening positions, it is determined that the OBD cannot monitor the working status of the GPF.

[0025] Furthermore, the standard time for maintaining the vehicle at idle speed in step S3 is more than 5 minutes.

[0026] Furthermore, in step S4, the first vehicle speed is 0km / h-10km / h, and the second vehicle speed is 40km / h-60km / h;

[0027] The standard driving time for a vehicle to repeatedly accelerate and decelerate between the first and second speeds is more than 10 minutes.

[0028] A third aspect of the present invention provides a method for using the GPF fault diagnosis device described in the first aspect above, characterized by comprising the following steps:

[0029] A1. Confirm that the vehicle's GPF is in normal working condition;

[0030] A2. Fully open valve one and valve two, partially open valve three;

[0031] A3. Drive the vehicle according to the manufacturer's diagnostic conditions, adjust the opening of valve three, and when the differential pressure value of the calibration differential pressure sensor reaches the manufacturer's specified differential pressure, check whether the OBD reports a "particulate matter trap has been removed" fault.

[0032] If the OBD reports a "particulate matter trap removed" fault, it is determined that the OBD can monitor the working status of the GPF.

[0033] Furthermore, in step A3, if the OBD does not report a "particulate matter trap removed" fault, then proceed to step A4;

[0034] A4. Increase the opening of valve three until it is at its maximum. Drive the vehicle according to the manufacturer's diagnostic conditions and check if the OBD reports a "particulate matter trap has been removed" fault.

[0035] If the OBD reports a "particulate filter removed" fault when valve three is in any opening position, it is determined that the OBD can monitor the working status of the GPF, but the differential pressure specified by the manufacturer is inaccurate.

[0036] If the OBD does not report a "particulate matter trap removed" fault at any opening degree of valve three, proceed to step A5;

[0037] A5. Close valve one and valve two, drive the vehicle according to the manufacturer's diagnostic conditions, and check if the OBD reports a "particulate matter trap has been removed" fault.

[0038] If the OBD reports a "particulate matter trap removed" fault, it indicates that the OBD can monitor the working status of the GPF, but the differential pressure specified by the manufacturer is inaccurate.

[0039] If the OBD does not report a "particulate matter trap removed" fault, it is determined that the OBD cannot monitor the working status of the GPF.

[0040] Compared with the prior art, the GPF fault simulation diagnosis device and method of the present invention have the following advantages:

[0041] (1) The GPF fault simulation diagnostic device of the present invention puts the vehicle under test in a diagnostic condition. By adjusting the opening of valve three, it can be determined whether the OBD can monitor the working status of the GPF. Compared with installing GPF fault components, it simplifies the fault simulation process and improves the efficiency of the fault diagnosis process.

[0042] (2) The GPF fault diagnosis method of the present invention can determine whether the OBD can monitor the working status of the GPF by driving the vehicle under different working conditions, even if the vehicle diagnostic working conditions are unknown.

[0043] (3) The GPF fault diagnosis method described in this invention can not only determine whether the OBD can monitor the working status of the GPF and improve the fault simulation efficiency by observing and verifying the actual pressure difference detected by the differential pressure sensor, but also determine whether the pressure difference specified by the manufacturer is accurate. Attached Figure Description

[0044] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0045] Figure 1 This is a schematic diagram of the device described in an embodiment of the present invention without the installation of a calibration differential pressure sensor;

[0046] Figure 2 This is a schematic diagram of the structure of the device for installing and calibrating the differential pressure sensor described in the embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of the device and GPF installation structure described in an embodiment of the present invention. Detailed Implementation

[0048] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0049] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] Example 1:

[0051] like Figures 1 to 3 As shown, a GPF fault simulation and diagnostic device includes:

[0052] The intake pipe has one end connected to the upstream pressure line of the differential pressure sensor and the other end connected to the upstream pressure line of the GPF. A valve is installed on the intake pipe.

[0053] The exhaust pipe has one end connected to the downstream pressure line of the differential pressure sensor and the other end connected to the downstream pressure line of the GPF. A valve is installed on the exhaust pipe.

[0054] The regulating pipe has one end connected to the upstream pressure line of the differential pressure sensor and the other end connected to the downstream pressure line of the differential pressure sensor. A valve is installed on the regulating pipe.

[0055] like Figure 1 As shown, the intake pipe includes pipe A and pipe D. Pipe A is connected to a tee (e.g., Figure 1 The exhaust pipe (303) is connected to pipe D. The exhaust pipe includes pipe B and pipe E. Pipe B is connected to a tee (such as...). Figure 1 The 304 pipe is connected to pipe E, and the regulating pipe (as shown in pipe C in 1) is connected to two tees at both ends. Pipe C is equipped with two connecting flanges (as shown in 1 ... Figure 1 (307, 308), both ends of valve three are connected to the two connecting flanges of pipe C, and the end of pipe D furthest from the tee (e.g., ...) Figure 1 The D pipe (305) is connected to the upstream pressure line of the GPF, and two connecting flanges (such as...) are installed on the D pipe. Figure 1 (Figures 309 and 310) Valve 1 is connected to the two connecting flanges of pipe D at both ends. Pipe E has two connecting flanges (Figures 311 and 312). Valve 2 is connected to the two connecting flanges of pipe E at both ends. The end of pipe E furthest from the tee (e.g., ...) Figure 1 (306) is connected to the downstream pressure line of GPF, and the end of pipe A furthest from the tee (e.g., Figure 1 (301) is connected to the upstream pressure line of the differential pressure sensor via the bamboo joint head, with the end of tube B furthest from the tee (e.g.) Figure 1 (302) is connected to the downstream pressure line of the differential pressure sensor through the bamboo joint head.

[0056] Valve 1, Valve 2, and Valve 3 all use butterfly valves with adjustable opening angles.

[0057] The inner diameters of the intake pipe, exhaust pipe, and regulating pipe are interconnected, and the inner diameter of the butterfly valve seat is the same as that of the intake pipe. The butterfly valve consists of an adjusting handle, a dial, a valve stem, a valve body, a flange hole, a valve seat, a butterfly plate, and a fixed base. The adjusting handle is located at the top of the butterfly valve and connected to the dial below. The dial has multiple adjustable positions, allowing for continuous adjustment of the exhaust flow. The valve body is made of stainless steel and connects to the fault simulation device through the flange hole.

[0058] The GPF fault diagnosis device also includes a calibration differential pressure sensor. One end of the calibration differential pressure sensor is connected to the upstream pressure line of the differential pressure sensor, and the other end is connected to the downstream pressure line of the differential pressure sensor.

[0059] like Figure 2 As shown, the two ends of the differential pressure sensor are connected to tube A (e.g., via tube F) through tube F. Figure 2 (e.g., 313 points of the middle tee), B pipe (such as...) Figure 2 (314 sections of Zhongsantong) are connected.

[0060] The differential pressure sensor calibration system includes a signal processing system comprising a power supply module, an electrical signal converter, a processor, a display module, and a monitor. The power supply module connects to an external DC power source with a voltage range of 9V-36V. This power supply provides power to the differential pressure sensor, processor, and monitor. The differential pressure sensor converts the pressure difference between the two pipelines and the downstream absolute pressure into an electrical signal, which is then transmitted to the electrical signal converter. The electrical signal converter converts the electrical signal into a digital signal and transmits it to the processor via the SENT protocol. The processor receives the SENT signal from the electrical signal converter, analyzes it to determine the pressure value, and transmits the pressure value to the display module. The display module and monitor then display the pressure signal.

[0061] By placing the vehicle under test in a diagnostic state and adjusting the opening of valve three, it can be determined whether the OBD can monitor the working status of the GPF. Compared with installing faulty GPF components, this simplifies the fault simulation process and improves the efficiency of the fault diagnosis process.

[0062] Example 2: A method for applying the GPF fault diagnosis device of Example 1 above, characterized by comprising the following steps:

[0063] S1. Confirm that the vehicle's GPF is in normal working condition;

[0064] S2. Fully open valve one and valve two, partially open valve three;

[0065] S3. Start the vehicle and keep it idling for a standard time. Then, press the accelerator pedal and check if the OBD reports a "particulate matter trap removed" fault.

[0066] If the OBD reports a "particulate filter removed" fault, it is determined that the OBD can monitor the working status of the GPF.

[0067] If the OBD does not report a "particulate matter trap removed" fault in step S3, proceed to step S4.

[0068] S4. Drive the vehicle, repeatedly accelerating and decelerating between the first and second speeds. After driving for a standard time, check if the OBD reports a "particulate matter trap removed" fault.

[0069] If the OBD reports a "particulate matter trap removed" fault, it is determined that the OBD can monitor the working status of the GPF.

[0070] If the OBD does not report a "particulate matter trap removed" fault, proceed to step S5;

[0071] S5. Increase the opening of valve three, or simultaneously decrease the opening of valve one and valve two, and repeat steps S3-S4 until the opening of valve three is at its maximum.

[0072] If the OBD reports a "particulate matter trap removed" fault when valve three is in any opening position, it is determined that the OBD can monitor the working status of the GPF.

[0073] If the OBD does not report a "particulate matter trap removed" fault at any of the valve opening positions, it is determined that the OBD cannot monitor the working status of the GPF.

[0074] In step S3, the standard time for keeping the vehicle at idle is more than 5 minutes.

[0075] In step S4, the first vehicle speed is 0km / h-10km / h, and the second vehicle speed is 40km / h-60km / h;

[0076] The standard driving time for a vehicle to repeatedly accelerate and decelerate between the first and second speeds is more than 10 minutes.

[0077] By driving the vehicle under different operating conditions, it is possible to determine whether the OBD can monitor the working status of the GPF even if the vehicle's diagnostic conditions are unknown.

[0078] Example 3:

[0079] A method for diagnosing GPF faults using the above-described embodiment 1, characterized by comprising the following steps:

[0080] A1. Confirm that the vehicle's GPF is in normal working condition;

[0081] A2. Fully open valve one and valve two, partially open valve three;

[0082] A3. Drive the vehicle according to the manufacturer's diagnostic conditions, adjust the opening of valve three, and when the differential pressure value of the calibration differential pressure sensor reaches the manufacturer's specified differential pressure, check whether the OBD reports a "particulate matter trap has been removed" fault.

[0083] If the OBD reports a "particulate matter trap removed" fault, it is determined that the OBD can monitor the working status of the GPF.

[0084] If the OBD does not report a "particulate matter trap removed" fault in step A3, proceed to step A4.

[0085] A4. Increase the opening of valve three until it is at its maximum. Drive the vehicle according to the manufacturer's diagnostic conditions and check if the OBD reports a "particulate matter trap has been removed" fault.

[0086] If the OBD reports a "particulate filter removed" fault when valve three is in any opening position, it is determined that the OBD can monitor the working status of the GPF, but the differential pressure specified by the manufacturer is inaccurate.

[0087] If the OBD does not report a "particulate matter trap removed" fault at any opening degree of valve three, proceed to step A5;

[0088] A5. Close valve one and valve two, drive the vehicle according to the manufacturer's diagnostic conditions, and check if the OBD reports a "particulate matter trap has been removed" fault.

[0089] If the OBD reports a "particulate matter trap removed" fault, it indicates that the OBD can monitor the working status of the GPF, but the differential pressure specified by the manufacturer is inaccurate.

[0090] If the OBD does not report a "particulate matter trap removed" fault, it is determined that the OBD cannot monitor the working status of the GPF.

[0091] By observing and verifying the actual pressure difference detected by the differential pressure sensor, it is possible not only to determine whether the OBD can monitor the working status of the GPF and improve the efficiency of fault simulation, but also to determine whether the pressure difference specified by the manufacturer is accurate.

[0092] Those skilled in the art will recognize that the units and method steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0093] In the several embodiments provided in this application, it should be understood that the disclosed methods and systems can be implemented in other ways. For example, the division of units described above is merely a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. The aforementioned units may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments of the present invention according to actual needs.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A GPF failure simulation diagnosis method characterized by, The GPF fault simulation diagnosis device comprises: An air inlet pipe, one end of which is communicated with the upstream pressure pipe of the differential pressure sensor, and the other end of which is communicated with the upstream pressure pipe of the GPF, and a valve one is arranged on the air inlet pipe; An air outlet pipe, one end of which is communicated with the downstream pressure pipe of the differential pressure sensor, and the other end of which is communicated with the downstream pressure pipe of the GPF, and a valve two is arranged on the air outlet pipe; An adjusting pipe, one end of which is communicated with the upstream pressure pipe of the differential pressure sensor, and the other end of which is communicated with the downstream pressure pipe of the differential pressure sensor, and a valve three is arranged on the adjusting pipe; The device further comprises a calibration differential pressure sensor, one end of which is communicated with the upstream pressure pipe of the differential pressure sensor, and the other end of which is communicated with the downstream pressure pipe of the differential pressure sensor; The method comprises the following steps: S1, confirming that the GPF of the vehicle is in a normal working state; S2, completely opening the valve one and the valve two, and partially opening the valve three; S3, starting the vehicle, keeping the vehicle in an idle state for a standard time, then stepping on the accelerator pedal, and checking whether the OBD reports a "particulate filter removed" fault; If the OBD reports the "particulate filter removed" fault, it is determined that the OBD can monitor the working state of the GPF; If the OBD does not report the "particulate filter removed" fault, step S4 is entered; S4, driving the vehicle, repeatedly accelerating and decelerating the vehicle between a first speed and a second speed, driving for a standard time, and checking whether the OBD reports the "particulate filter removed" fault; If the OBD reports the "particulate filter removed" fault, it is determined that the OBD can monitor the working state of the GPF; If the OBD does not report the "particulate filter removed" fault, step S5 is entered; S5, increasing the opening degree of the valve three, or simultaneously reducing the opening degrees of the valve one and the valve two, and repeating steps S3-S4 until the opening degree of the valve three is maximized; If the OBD reports the "particulate filter removed" fault at any opening degree of the valve three, it is determined that the OBD can monitor the working state of the GPF; If the OBD does not report the "particulate filter removed" fault at any opening degree of the valve three, it is determined that the OBD cannot monitor the working state of the GPF.

2. The GPF failure simulation diagnosis method according to claim 1, characterized in that: The valve one, the valve two and the valve three are butterfly valves with an adjusting opening angle function.

3. The GPF failure simulation diagnosis method according to claim 2, characterized in that: The inner diameters of the air inlet pipe, the air outlet pipe and the adjusting pipe are communicated, and the inner diameter of the butterfly valve seat is the same as the inner diameter of the air inlet pipe.

4. The GPF failure simulation diagnosis method according to claim 1, characterized in that: The standard time for keeping the vehicle in the idle state in step S3 is more than 5 minutes.

5. The GPF failure simulation diagnosis method according to claim 1, characterized in that: In step S4, the first speed is 0-10 km / h, and the second speed is 40-60 km / h; The driving standard time for repeatedly accelerating and decelerating the vehicle between the first speed and the second speed is more than 10 minutes.

6. The GPF failure simulation diagnosis method according to claim 1, characterized in that, The method comprises the following steps: A1, confirming that the GPF of the vehicle is in a normal working state; A2, completely opening the valve one and the valve two, and partially opening the valve three; A3, drive the vehicle according to the diagnostic conditions of the manufacturer, adjust the opening of valve three, and check whether the OBD reports "GPF removed" fault when the pressure difference value of the calibration pressure difference sensor reaches the specified pressure difference required by the manufacturer; If the OBD reports "GPF removed" fault, it is determined that the OBD can monitor the working state of the GPF.

7. The GPF fault simulation diagnosis method according to claim 6, characterized in that: In step A3, if the OBD does not report "GPF removed" fault, proceed to step A4; A4, increase the opening of valve three until the opening of valve three reaches the maximum, drive the vehicle according to the diagnostic conditions of the manufacturer, and check whether the OBD reports "GPF removed" fault; If the OBD reports "GPF removed" fault at any opening of valve three, it is determined that the OBD can monitor the working state of the GPF, but the specified pressure difference required by the manufacturer is inaccurate; If the OBD does not report "GPF removed" fault at any opening of valve three, proceed to step A5; A5, close valve one and valve two, drive the vehicle according to the diagnostic conditions of the manufacturer, and check whether the OBD reports "GPF removed" fault; If the OBD reports "GPF removed" fault, it is determined that the OBD can monitor the working state of the GPF, but the specified pressure difference required by the manufacturer is inaccurate; If the OBD does not report "GPF removed" fault, it is determined that the OBD cannot monitor the working state of the GPF.

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