CN113266495A - Device and method for diagnosing carbon tank electromagnetic valve fault by utilizing vacuum degree of fuel system - Google Patents
Device and method for diagnosing carbon tank electromagnetic valve fault by utilizing vacuum degree of fuel system Download PDFInfo
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- CN113266495A CN113266495A CN202110483902.5A CN202110483902A CN113266495A CN 113266495 A CN113266495 A CN 113266495A CN 202110483902 A CN202110483902 A CN 202110483902A CN 113266495 A CN113266495 A CN 113266495A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0809—Judging failure of purge control system
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Combustion & Propulsion (AREA)
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- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
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Abstract
The invention provides a device and a method for diagnosing faults of a carbon tank electromagnetic valve by utilizing the vacuum degree of a fuel system, wherein the device comprises the carbon tank electromagnetic valve, a first fuel pipeline, a second fuel pipeline and a third fuel pipeline; one end of the first fuel pipeline is a first connecting port, and the other end of the first fuel pipeline is a second connecting port; one end of the third fuel pipeline is a third connecting port, and the other end of the third fuel pipeline is a fourth connecting port; the inlet end of the carbon tank electromagnetic valve is connected with the second connecting port of the first fuel pipeline; the outlet end of the carbon tank electromagnetic valve is connected with a fourth connecting port of the third fuel pipeline; the second three-way valve is arranged between the third connecting port and the fourth connecting port. The invention has the beneficial effects that: the invention provides a device for diagnosing faults of an automobile carbon tank electromagnetic valve by utilizing the vacuum degree of a fuel system.
Description
Technical Field
The invention belongs to the field of vehicle-mounted diagnosis, and particularly relates to a device and a method for diagnosing faults of a carbon tank electromagnetic valve by utilizing the vacuum degree of a fuel system.
Background
Canister solenoid valves are an important part of automotive evaporative emission control systems. The fuel vapor generated in the fuel tank is stored in an activated carbon canister, and the fuel vapor passes through a canister solenoid valve to an intake manifold when the engine is started, and is then introduced into the engine for combustion. The normal work of carbon canister solenoid valve can guarantee the adsorption efficiency of carbon canister, suppresses the hydrocarbon emission of vehicle simultaneously, influences the emission level of vehicle when breaking down, consequently requires the OBD system to monitor the leakage trouble of carbon canister solenoid valve in the light-duty car country VI discharges the regulation.
Aiming at a common fuel evaporation system in the market, the existing OBD detection method for the leakage fault of the carbon tank electromagnetic valve is that an external resistor or other accessories are used for replacing the carbon tank electromagnetic valve to receive a control signal of an ECU (electronic control unit), so that the opening and closing state of the carbon tank electromagnetic valve is changed, meanwhile, the ECU is connected with a processor through a vehicle-mounted OBD interface, and finally, the leakage and full-open fault code of the carbon tank electromagnetic valve is displayed in the processor. However, the method needs a plurality of connected accessories, the fault diagnosis process is relatively complex, and meanwhile, due to the fact that the control strategies of the vehicles to be tested are different, the method cannot guarantee that the fault codes can be effectively generated in each test.
Disclosure of Invention
In view of the above, the present invention is directed to a device and a method for diagnosing a fault of a canister solenoid valve by using a vacuum degree of a fuel system, wherein a fault simulation device is used to cause a fault related to the canister solenoid valve, a change in the vacuum degree of the fuel system is determined by a pressure sensor, and the fault diagnosis is performed on the canister solenoid valve, so as to realize a function of simulating and monitoring the fault of the canister solenoid valve.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the first aspect of the invention discloses a device for diagnosing the fault of a carbon tank electromagnetic valve by utilizing the vacuum degree of a fuel system, which comprises an electromagnetic valve, a first fuel pipeline, a second fuel pipeline and a third fuel pipeline;
one end of the first fuel pipeline is a first connecting port, and the other end of the first fuel pipeline is a second connecting port;
one end of the third fuel pipeline is a third connecting port, and the other end of the third fuel pipeline is a fourth connecting port;
the inlet end of the electromagnetic valve is connected with a second connecting port of the first fuel pipeline;
the outlet end of the electromagnetic valve is connected with a fourth connecting port of the third fuel pipeline;
one end of the second fuel pipeline is connected with the first fuel pipeline through a first three-way valve, and the other end of the second fuel pipeline is connected with the third fuel pipeline through a second three-way valve;
the first three-way valve is arranged between the first connecting port and the second connecting port;
the second three-way valve is arranged between the third connecting port and the fourth connecting port;
the second fuel pipeline is provided with a quantitative leakage unit which comprises a leakage hole arranged on the second fuel pipeline.
The system also comprises a fault handling system, and the fault handling system is used for detecting related faults of the carbon tank solenoid valve.
Furthermore, the fault processing system comprises a power supply module, a processor, a power supply input interface, a display module, a pressure signal input module, an electric signal converter and a signal converter;
the power supply input interface is connected with an external power supply and the power supply module, and the power supply module acquires power supply voltage through the power supply input interface and provides power supply for the processor, the display module and other devices;
the pressure signal input module receives the pressure signal converted by the electric signal converter and inputs the pressure signal into the processor for analysis;
the processor receives switching signals of the carbon tank electromagnetic valve and the ventilation valve through the signal processor;
the processor processes the input pressure signal and the signal processor parameter, judges whether the carbon tank electromagnetic valve fault occurs or not and transmits the result to the connected display module;
and the display module is connected with the processor and the display screen and is used for displaying the fault judgment result of the carbon tank electromagnetic valve.
Furthermore, a first connecting port of the first fuel pipeline is connected with a desorption port of the carbon tank, and a third connecting port of the third fuel pipeline is connected with an air inlet manifold of the engine.
The testing box is of a box body structure with an opening at the upper part, and a first top cover and a second top cover are arranged at the opening part above the box body interface;
the box structure is characterized by further comprising a first rotating shaft, a second rotating shaft, a third rotating shaft and a fourth rotating shaft, wherein one side of the first top cover is movably connected with the box structure through the first rotating shaft and the second rotating shaft, and one side of the second top cover is movably connected with the box structure through the third rotating shaft and the fourth rotating shaft.
Furthermore, the opening edge part of test box top upwards extends and forms the arch, and the opening of test box top forms the holding tank structure that is used for holding first top cap and second top cap.
Furthermore, a fixing groove is formed in the test box and used for placing the electromagnetic valve.
Furthermore, one end of a first connecting port of the first fuel pipeline extends out of the test box, and one end of a third connecting port of the third fuel pipeline extends out of the test box.
The scheme provides a method for diagnosing the fault of a carbon tank electromagnetic valve by utilizing the vacuum degree of a fuel system, which comprises the following steps:
s1, keeping the fuel liquid level of the test vehicle between 15% and 85%, and fully heating the vehicle;
s2, detaching the carbon tank electromagnetic valve of the test vehicle, installing the carbon tank electromagnetic valve and the original vehicle wiring harness on the fault simulation device, connecting the fault simulation device with the ECU, the OBD interface, the USB-CAN and the like, completing the communication between the processor and the ECU and confirming that the vehicle has no fault currently;
s3, soaking the vehicle to be tested for 8 hours at the temperature of 10-35 ℃;
s4, electrifying after the vehicle immersion is finished, reading OBD data by using a processor, starting the engine and idling for 1min when the temperature difference between the engine coolant and the environment temperature measured by the vehicle is less than 7 ℃ and the temperature needs to be kept immersed to meet the requirement if the difference is large, and observing whether a carbon tank electromagnetic valve fault code is generated;
s5, if not, the vehicle is continuously idled for 10min to be fully heated, and whether a fault code of the carbon tank electromagnetic valve is generated is observed;
and S6, if not, driving the vehicle at the speed of more than 20km/h on the chassis dynamometer or the actual road until the fault code is generated.
Compared with the prior art, the device and the method for diagnosing the carbon tank electromagnetic valve fault by utilizing the vacuum degree of the fuel system have the following beneficial effects:
(1) the invention overcomes the defects of the prior art and provides a device for diagnosing the fault of the carbon tank electromagnetic valve of the automobile by utilizing the vacuum degree of a fuel system, the fault simulation device is utilized to cause the relevant fault of the carbon tank electromagnetic valve, the change of the vacuum degree of the fuel system is determined by a pressure sensor, the fault diagnosis is carried out on the carbon tank electromagnetic valve, and the functions of simulating and monitoring the fault of the carbon tank electromagnetic valve are realized;
(2) according to the invention, the leakage fault of the electromagnetic valve is simulated by arranging the leakage hole on the second fuel pipeline, the ECU transmits a full-closed signal of the electromagnetic valve, at the moment, the carbon tank is in a leakage state at present due to the existence of the leakage hole, and further the detection capability of the OBD on the leakage fault is detected, if the OBD detects the leakage, the OBD is normal, and if the leakage is not detected, the vehicle is proved to have the fault.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is an overall frame diagram of a failure diagnosis apparatus according to the present invention;
fig. 2 is a schematic diagram of the internal arrangement of the fault diagnosis device according to the present invention;
FIG. 3 is a schematic diagram of a fault diagnosis system according to the present invention;
FIG. 4 is a schematic diagram of the present invention relating to the diagnosis of a vacuum fault in a fuel tank;
FIG. 5 is a flow chart of a method of diagnosing a canister solenoid valve leak in accordance with the present invention;
FIG. 6 is a schematic view of the structure of the top cover according to the present invention;
fig. 7 is a front view of the device according to the invention.
Description of reference numerals:
201-a first top cover; 202-a second top cover; 203-a first rotating shaft; 204-a second rotating shaft; 205-a third shaft; 206-a fourth shaft; 301-canister solenoid valve; 303-a first three-way valve; 304-a leak hole; 305-a second three-way valve; 308-a fixed slot; 309-quick plug end; 310-a first fuel line; 311-a second fuel line; 312-a third fuel line; 317-original vehicle wiring harness.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to solve the technical problem, the invention provides a device for diagnosing the fault of an automobile carbon canister electromagnetic valve 301 by utilizing the vacuum degree of a fuel tank, which is integrally arranged as shown in figure 1.
The fault diagnosis device comprises a fault simulation system, a fault diagnosis system, a signal input system and the like. The two ends of the fault diagnosis device are respectively connected with a carbon tank desorption pipeline and an air inlet manifold of the engine, the signal input system comprises a pressure sensor, an electric signal converter, a pressure signal input module, a signal processor and the like, and the signal input system is arranged in the fault diagnosis device.
The fault diagnosis apparatus encapsulates the fault simulation and fault diagnosis system in a rectangular box as shown in fig. 2. The fault simulation system comprises a first fuel vacuum pipeline, a second fuel vacuum pipeline, a third fuel vacuum pipeline, a pressure sensor, a leakage hole 304, an electromagnetic valve original vehicle wiring harness 317, two three-way valves, a plurality of pipeline joints and a fuel pipe quick joint. The pipeline joint end of the first fuel pipeline 310 is connected with a carbon tank desorption pipeline through a round hole in the side face of the packaging box body, the other end of the first fuel pipeline is communicated with a pipeline interface of the second fuel pipeline 311 and a pipeline interface of the carbon tank electromagnetic valve 301 through a three-way valve, the carbon tank electromagnetic valve 301 and the first fuel pipeline 310 are connected with the pipeline interface of the electromagnetic valve through a fuel pipe quick plug, the pressure sensor is located on a first pipeline in the fault simulation system, and the pressure sensor is connected with an electric signal converter in the fault diagnosis system. The third fuel pipeline 312 fuel pipe quick connector is connected with an engine air inlet manifold through a round hole in the side face of the packaging box body, the other end of the third fuel pipeline 312 fuel pipe quick connector is communicated with a second fuel pipeline 311 and a carbon tank electromagnetic valve 301 fuel pipe quick plug through a three-way valve, and the carbon tank electromagnetic valve 301 and the third fuel pipeline 312 are connected through the fuel pipe quick plug and a pipeline connector. The second fuel pipeline 311 is connected with the first and third fuel pipelines 312 of the three-way valve, and a 1mm leakage hole 304 is arranged in the pipelines.
The diagnosis system of the fault diagnosis device is divided into a power supply module, a processor, a power supply input interface, a display module, a pressure signal input module, an electric signal converter, a signal converter and the like, as shown in fig. 3. The power input interface is connected with an external power supply and a power module, wherein the external power supply is a direct-current power supply, the voltage range is 9-36V, and the power can be obtained from external power supply equipment. The power supply module obtains power supply voltage through the power supply input interface and provides power supply for the processor, the display module and other devices. The pressure signal input module receives the pressure signal converted by the electric signal converter and inputs the pressure signal into the processor for analysis. The processor receives on-off signals of the carbon tank electromagnetic valve 301 and the carbon tank vent valve through the signal processor. The processor processes the input pressure signal and the signal processor parameters, determines whether a failure occurs in the canister solenoid valve 301, and transmits the result to the connected display module. The display module is connected with the processor and the display screen and used for displaying the fault judgment result of the carbon tank electromagnetic valve 301, and fig. 4 is a schematic diagram of fault diagnosis of the carbon tank electromagnetic valve 301.
Fig. 5 is a flow chart of a diagnosis method for leakage of the canister solenoid valve 301, and the OBD detection method using the above device includes the following steps, which need to be adjusted according to a fault diagnosis method provided by a manufacturer:
s1, keeping the fuel liquid level of the test vehicle between 15% and 85%, and fully heating the vehicle;
s2, detaching the carbon tank electromagnetic valve of the test vehicle, installing the carbon tank electromagnetic valve and the original vehicle wiring harness on the fault simulation device, connecting the fault simulation device with the ECU, the OBD interface, the USB-CAN and the like, completing the communication between the processor and the ECU and confirming that the vehicle has no fault currently;
s3, soaking the vehicle to be tested for 8 hours at the temperature of 10-35 ℃;
s4, electrifying after the vehicle immersion is finished, reading OBD data by using a processor, starting the engine and idling for 1min when the temperature difference between the engine coolant and the environment temperature measured by the vehicle is less than 7 ℃ and the temperature needs to be kept immersed to meet the requirement if the difference is large, and observing whether a carbon tank electromagnetic valve fault code is generated;
s5, if not, the vehicle is continuously idled for 10min to be fully heated, and whether a fault code of the carbon tank electromagnetic valve is generated is observed;
and S6, if not, driving the vehicle at the speed of more than 20km/h on the chassis dynamometer or the actual road until the fault code is generated.
The technical solutions of the present invention are further described in detail with reference to the accompanying drawings and specific embodiments, which are only illustrative of the present invention and are not intended to limit the present invention. In order to solve the technical problem, the invention provides a device and a method for diagnosing the fault of an automobile carbon tank electromagnetic valve 301 by using a fuel tank.
The overall arrangement of the fault diagnosis apparatus and the signal input system is shown in fig. 1. The fault diagnosis device comprises a fault simulation system, a fault diagnosis system, a signal input system and the like. The two ends of the fault diagnosis device are respectively connected with a carbon tank desorption pipeline and an air inlet manifold of the engine, and the signal input system comprises a pressure sensor, an electric signal converter, a pressure signal input module, a signal processor and the like.
Fig. 2 shows an internal structure of the fault diagnosis apparatus. The fault diagnosis apparatus encapsulates the fault simulation and fault diagnosis system in a rectangular box as shown in fig. 2. The fault simulation system comprises a first fuel vacuum pipeline, a second fuel vacuum pipeline, a third fuel vacuum pipeline, a pressure sensor, a leakage hole 304, an electromagnetic valve original vehicle wiring harness 317, two three-way valves, a plurality of pipeline joints and a fuel pipe quick joint. The pipeline joint end of the first fuel pipeline 310 is connected with a carbon tank desorption pipeline through a round hole in the side face of the packaging box body, the other end of the first fuel pipeline is communicated with a pipeline interface of the second fuel pipeline 311 and a pipeline interface of the carbon tank electromagnetic valve 301 through a three-way valve, the carbon tank electromagnetic valve 301 and the first fuel pipeline 310 are connected with the pipeline interface of the electromagnetic valve through a fuel pipe quick plug, the pressure sensor is located on a first pipeline in the fault simulation system, and the pressure sensor is connected with an electric signal converter in the fault diagnosis system. The third fuel pipeline 312 fuel pipe quick connector is connected with an engine air inlet manifold through a round hole in the side face of the packaging box body, the other end of the third fuel pipeline 312 fuel pipe quick connector is communicated with a second fuel pipeline 311 and a carbon tank electromagnetic valve 301 fuel pipe quick plug through a three-way valve, and the carbon tank electromagnetic valve 301 and the third fuel pipeline 312 are connected through the fuel pipe quick plug and a pipeline connector. The second fuel pipeline 311 is connected with the first and third fuel pipelines 312 through a three-way valve, and a 1mm leakage hole 304 is arranged in the pipeline.
Fig. 3 is a schematic structural diagram of the fault diagnosis system. The diagnosis system of the fault diagnosis device comprises a power supply module, a processor, a power supply input interface, a display module, a pressure signal input module, an electric signal converter, a signal processor and the like. The power input interface is connected with an external power supply and a power module, wherein the external power supply is a direct current power supply, the voltage range is 9-36V, and the power can be obtained from external power supply equipment. The power supply module obtains power supply voltage through the power supply input interface and provides power supply for the processor, the display module and other devices. The pressure signal input module receives the pressure signal converted by the electric signal converter and inputs the pressure signal into the processor for analysis. The processor receives the on-off state signals of the carbon canister solenoid valve 301 and the vent valve through the signal processor. The processor processes the input pressure signal and the signal processor parameters, determines whether a failure occurs in the canister solenoid valve 301, and transmits the result to the connected display module. The display module is connected with the processor and the display screen and used for displaying the fault judgment result of the carbon tank electromagnetic valve 301, and fig. 4 is a schematic diagram of fault diagnosis of the carbon tank electromagnetic valve 301.
Fig. 5 is a flowchart of a method for diagnosing a leak in the canister solenoid valve 301, and the OBD detection method using the above apparatus includes the steps of:
s1, keeping the fuel liquid level of the test vehicle between 15% and 85%, and fully heating the vehicle;
s2, detaching the carbon tank electromagnetic valve of the test vehicle, installing the carbon tank electromagnetic valve and the original vehicle wiring harness on the fault simulation device, connecting the fault simulation device with the ECU, the OBD interface, the USB-CAN and the like, completing the communication between the processor and the ECU and confirming that the vehicle has no fault currently;
s3, soaking the vehicle to be tested for 8 hours at the temperature of 10-35 ℃;
s4, electrifying after the vehicle immersion is finished, reading OBD data by using a processor, starting the engine and idling for 1min when the temperature difference between the engine coolant and the environment temperature measured by the vehicle is less than 7 ℃ and the temperature needs to be kept immersed to meet the requirement if the difference is large, and observing whether a carbon tank electromagnetic valve fault code is generated;
s5, if not, the vehicle is continuously idled for 10min to be fully heated, and whether a fault code of the carbon tank electromagnetic valve is generated is observed;
and S6, if not, driving the vehicle at the speed of more than 20km/h on the chassis dynamometer or the actual road until the fault code is generated.
Those of ordinary skill in the art will appreciate that the elements and method steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of clearly illustrating the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the several embodiments provided in the present application, it should be understood that the disclosed method and system may be implemented in other ways. For example, the above described division of elements is merely a logical division, and other divisions may be realized, for example, multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not executed. The units may or may not be physically separate, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. Utilize fuel system vacuum degree diagnosis carbon tank solenoid valve trouble device, its characterized in that: comprises a carbon tank electromagnetic valve, a first fuel pipeline (310), a second fuel pipeline (311) and a third fuel pipeline (312);
one end of the first fuel pipeline (310) is a first connecting port, and the other end of the first fuel pipeline is a second connecting port;
one end of the third fuel pipeline (312) is a third connecting port, and the other end of the third fuel pipeline is a fourth connecting port;
the inlet end of the carbon tank electromagnetic valve is connected with a second connecting port of the first fuel pipeline (310);
the outlet end of the carbon tank electromagnetic valve is connected with a fourth connecting port of a third fuel pipeline (312);
one end of the second fuel pipeline (311) is connected with the first fuel pipeline (310) through a first three-way valve (303), and the other end of the second fuel pipeline (311) is connected with the third fuel pipeline (312) through a second three-way valve (305);
the first three-way valve (303) is arranged between the first connecting port and the second connecting port;
a second three-way valve (305) is provided between the third connection port and the fourth connection port;
the second fuel pipeline (311) is provided with a quantitative leakage unit, and the quantitative leakage unit comprises a leakage hole (304) arranged on the second fuel pipeline (311);
the system also comprises a fault handling system, and the fault handling system is used for detecting related faults of the carbon tank solenoid valve.
2. The apparatus for diagnosing malfunction of a canister solenoid valve using vacuum degree of a fuel system according to claim 1, wherein: the fault processing system comprises a power supply module, a processor, a power supply input interface, a display module, a pressure signal input module, an electric signal converter and a signal converter;
the power supply input interface is connected with an external power supply and the power supply module, and the power supply module acquires power supply voltage through the power supply input interface and provides power supply for the processor, the display module and other devices;
the pressure signal input module receives the pressure signal converted by the electric signal converter and inputs the pressure signal into the processor for analysis;
the processor receives switching signals of the carbon tank electromagnetic valve and the ventilation valve through the signal processor;
the processor processes the input pressure signal and the signal processor parameter, judges whether the carbon tank electromagnetic valve fault occurs or not and transmits the result to the connected display module;
and the display module is connected with the processor and the display screen and is used for displaying the fault judgment result of the carbon tank electromagnetic valve.
3. The apparatus for diagnosing malfunction of a canister solenoid valve using vacuum degree of a fuel system according to claim 1, wherein: the first connecting port of the first fuel pipeline (310) is connected with the desorption port of the carbon tank, and the third connecting port of the third fuel pipeline (312) is connected with the air inlet manifold of the engine.
4. The apparatus for diagnosing malfunction of a canister solenoid valve using vacuum degree of a fuel system according to claim 1, wherein: the testing box is of a box body structure with an opening at the upper part, and a first top cover (201) and a second top cover (202) are arranged at the opening part above the box body interface;
the box structure is characterized by further comprising a first rotating shaft (203), a second rotating shaft (204), a third rotating shaft (205) and a fourth rotating shaft (206), wherein one side of the first top cover (201) is movably connected with the box structure through the first rotating shaft (203) and the second rotating shaft (204), and one side of the second top cover (202) is movably connected with the box structure through the third rotating shaft (205) and the fourth rotating shaft (206).
5. The apparatus for diagnosing malfunction of a canister solenoid valve using vacuum degree of a fuel system according to claim 4, wherein: the edge part of the opening above the test box extends upwards to form a bulge, and the opening above the test box forms a containing groove structure for containing the first top cover (201) and the second top cover (202).
6. The apparatus for diagnosing malfunction of a canister solenoid valve using vacuum degree of a fuel system according to claim 4, wherein: the test box is also internally provided with a fixing groove (308), and the fixing groove (308) is used for placing the electromagnetic valve.
7. The apparatus for diagnosing malfunction of a canister solenoid valve using vacuum degree of a fuel system according to claim 4, wherein: one end of the first connecting port of the first fuel pipeline (310) extends out of the test box, and one end of the third connecting port of the third fuel pipeline (312) extends out of the test box.
8. The method for the simulation system for the fault diagnosis of the automobile carbon tank solenoid valve as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
s1, keeping the fuel liquid level of the test vehicle between 15% and 85%, and fully heating the vehicle;
s2, detaching the carbon tank electromagnetic valve of the test vehicle, installing the carbon tank electromagnetic valve and the original vehicle wiring harness on the fault simulation device, connecting the fault simulation device with the ECU, the OBD interface, the USB-CAN and the like, completing the communication between the processor and the ECU and confirming that the vehicle has no fault currently;
s3, soaking the vehicle to be tested for 8 hours at the temperature of 10-35 ℃;
s4, electrifying after the vehicle immersion is finished, reading OBD data by using a processor, starting the engine and idling for 1min when the temperature difference between the engine coolant and the environment temperature measured by the vehicle is less than 7 ℃ and the temperature needs to be kept immersed to meet the requirement if the difference is large, and observing whether a carbon tank electromagnetic valve fault code is generated;
s5, if not, the vehicle is continuously idled for 10min to be fully heated, and whether a fault code of the carbon tank electromagnetic valve is generated is observed;
and S6, if not, driving the vehicle at the speed of more than 20km/h on the chassis dynamometer or the actual road until the fault code is generated.
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| CN113790895A (en) * | 2021-09-09 | 2021-12-14 | 安徽江淮汽车集团股份有限公司 | Fuel evaporation diagnosis test method and system based on hardware-in-the-loop |
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| CN113790895A (en) * | 2021-09-09 | 2021-12-14 | 安徽江淮汽车集团股份有限公司 | Fuel evaporation diagnosis test method and system based on hardware-in-the-loop |
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| CN113266495B (en) | 2023-01-10 |
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