CN113266497A - Simulation device and method for fault diagnosis of automobile carbon tank electromagnetic valve - Google Patents
Simulation device and method for fault diagnosis of automobile carbon tank electromagnetic valve Download PDFInfo
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- CN113266497A CN113266497A CN202110486069.XA CN202110486069A CN113266497A CN 113266497 A CN113266497 A CN 113266497A CN 202110486069 A CN202110486069 A CN 202110486069A CN 113266497 A CN113266497 A CN 113266497A
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- carbon tank
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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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
- Testing Of Engines (AREA)
Abstract
The invention provides a simulation device and a method for fault diagnosis of an electromagnetic valve of an automobile carbon tank, wherein the simulation device comprises an electromagnetic valve, a first fuel oil pipeline, a second fuel oil pipeline and a third fuel oil 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. The invention has the beneficial effects that: the method has the advantages that the external resistor is replaced by a mechanical connection method, idle faults caused by normally open of the carbon tank electromagnetic valve are avoided, the fuel tank protection is enhanced, the success rate of fault code generation is improved, related faults of the carbon tank electromagnetic valve can be simulated more conveniently, and the efficiency of the OBD diagnosis system is improved.
Description
Technical Field
The invention belongs to the field of vehicle-mounted diagnosis, and particularly relates to a simulation device and method for fault diagnosis of an electromagnetic valve of an automobile carbon tank.
Background
The carbon tank electromagnetic valve is a part of a fuel evaporation system, and the leakage and full-open faults of the carbon tank electromagnetic valve can cause the fuel steam in a fuel tank to enter an engine uncontrollably, so that the problems of difficult vehicle starting, unstable idling, excessive emission and the like are caused. Therefore, the OBD system is required to be capable of monitoring the leakage fault of the carbon tank electromagnetic valve in real time in the national VI emission regulations of the light vehicle.
When the monitoring capability of the OBD system on the fault of the carbon tank electromagnetic valve is checked, the leakage or full-open fault of the carbon tank electromagnetic valve needs to be simulated firstly. Aiming at a common fuel evaporation system in the market, the existing simulation method is to connect an automobile electronic control unit ECU with a BOB junction box and replace an electromagnetic coil for controlling the switch of a carbon tank electromagnetic valve by an external resistor or an accessory. In this way, even if the electronic control unit ECU outputs a closed electric signal, the canister solenoid valve can be maintained in an open state, which passes the oil gas flow rate equivalent to the leakage rate of the canister solenoid valve. However, the connection is complicated by this method, and a resistor or an accessory is additionally connected through the BOB junction box; meanwhile, the large opening degree of the carbon tank electromagnetic valve can cause excessive oil gas entering an engine, so that the idling speed of a vehicle is high during OBD monitoring, and the fault code of the carbon tank electromagnetic valve is influenced; on the other hand, the increase of the vacuum degree of the fuel tank causes the outer shell to be extruded, and the service life of the fuel tank is reduced.
Disclosure of Invention
In view of this, the present invention is directed to provide a simulation apparatus and a method for fault diagnosis of an automotive canister solenoid valve, so as to replace an external resistor by mechanical connection, and encapsulate a leakage hole and the canister solenoid valve in a box body, thereby implementing functions of simulating and monitoring a leakage 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 simulation device for fault diagnosis of an electromagnetic valve of an automobile carbon tank, which comprises the electromagnetic valve, a first fuel oil pipeline, a second fuel oil pipeline and a third fuel oil 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 leakage unit which comprises a leakage hole arranged on the second fuel pipeline.
Further, the solenoid valve comprises a canister solenoid 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 ECU is an electronic control unit, namely a running computer, and is connected with an OBD interface through a USB-CAN communication interface to complete communication with the ECU of the test vehicle and obtain vehicle parameters;
the processor is connected with the ECU through the CAN communication interface and the OBD interface and is used for communicating with the ECU of the test vehicle and acquiring vehicle parameters.
In a third aspect, the present invention discloses a simulation method for fault diagnosis of an electromagnetic valve of an automobile carbon tank, and a simulation system for fault diagnosis of an electromagnetic valve of an automobile carbon tank according to a second aspect, which includes 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, wherein the soaking environment temperature is 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 simulation device for fault diagnosis of the automobile carbon tank electromagnetic valve has the following beneficial effects:
(1) the method replaces an external resistor with a mechanical connection method, avoids idle faults caused by normally open of the carbon tank electromagnetic valve, enhances the protection of the fuel tank, improves the success rate of generating fault codes, can simulate relevant faults of the carbon tank electromagnetic valve more conveniently, and improves the efficiency of an OBD diagnosis system.
(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 fault simulation apparatus according to the present invention;
FIG. 2 is a schematic diagram of a top cover structure of the fault simulation apparatus according to the present invention;
FIG. 3 is a front view and a top view of a fault simulation device according to the present invention;
FIG. 4 is a flow chart of a method for diagnosing a fault of a canister solenoid valve according to the present 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.
A simulation device for fault diagnosis of an electromagnetic valve of an automobile carbon tank comprises the electromagnetic valve, a first fuel oil pipeline, a second fuel oil pipeline and a third fuel oil 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 line 311 is provided with a leakage unit, which includes a leakage hole 304 provided on the second fuel line 311, and the leakage hole may be provided with leakage holes of different sizes as needed.
The solenoid valve comprises a carbon canister solenoid valve.
The first connecting port of the first fuel pipeline is connected with the desorption port of the carbon tank, and the third connecting port of the third fuel pipeline is connected with the 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.
The opening edge position 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.
The test box is also internally provided with a fixing groove for placing the electromagnetic valve.
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.
A simulation system for fault diagnosis of an electromagnetic valve of an automobile carbon tank further comprises an ECU and a processor, wherein the ECU is an electronic control unit, namely a traveling computer, and the processor is connected with an OBD interface through a USB-CAN communication interface to complete communication with the ECU of a test vehicle and acquire vehicle parameters;
the processor is connected with the ECU through the CAN communication interface and the OBD interface and is used for communicating with the ECU of the test vehicle and acquiring vehicle parameters.
A simulation method for fault diagnosis of an automobile carbon tank electromagnetic valve comprises the following 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, wherein the soaking environment temperature is 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 for diagnosing the fault of the electromagnetic valve of the carbon tank of the automobile, which comprises a fault simulation device, an ECU, an OBD interface, a USB-CAN communication interface, a processor and the like.
Referring to fig. 1, the air inlet end of the fault simulation device is connected with a carbon canister desorption pipeline of a test vehicle, the exhaust end pipeline is connected with an air inlet manifold of an engine, the air inlet and exhaust pipeline is connected with the carbon canister desorption pipeline and the air inlet manifold of the engine through a fuel pipe quick plug, the diameter of the air inlet and exhaust pipeline is 11.8mm, and the specification of the fuel pipe quick plug is phi 12mm multiplied by 11.8 mm. The processor is connected with the OBD interface through the USB-CAN communication interface, completes communication with the ECU and reads vehicle parameters.
Referring to fig. 2, the fault simulation device is packaged in a rectangular box, the length, the width and the height of the rectangular box are 350 mm, 200 mm and 100mm respectively, two first top covers 201 and two second top covers 202 which are the same in size are arranged at the top of the box, the first top covers 201 are connected with the left side face through first rotating shafts 203 and second rotating shafts 204 which are made of copper, and the second top covers 202 are connected with the right side face through third rotating shafts 205 and fourth rotating shafts 206 which are made of copper, so that the first top covers 201 and the second top covers 202 are opened and closed. The first top cover 201 and the second top cover 202 are fixed by a lateral accommodating groove when being closed.
Referring to fig. 3a, the fault simulation device is arranged inside a tank body, and the fault simulation device includes a first fuel pipeline, a second fuel pipeline, a third fuel pipeline, a leakage hole 304, a carbon canister solenoid valve fixing groove 308, a solenoid valve original vehicle wiring harness 317, a plurality of three-way valves, and a fuel pipe quick plug.
One end of a first fuel pipeline penetrates through the side face of the test box body to be connected with the end of the carbon tank desorption pipeline, the first fuel pipeline is communicated with a second fuel pipeline through a first three-way valve 303, and the other end of the first fuel pipeline is connected with the inlet end of a carbon tank electromagnetic valve.
One end of a third fuel pipeline penetrates through the side face of the test box body to be connected with an air inlet manifold of the engine, the third fuel pipeline is connected with the second fuel pipeline through a second three-way valve 305, and meanwhile the other end of the third fuel pipeline is connected with a fuel pipe quick plug end 309 at the outlet end of the carbon tank electromagnetic valve.
A leakage hole is provided in the second fuel line, wherein the leakage hole 304 has a diameter of 1 mm. Referring to fig. 3a and 3b, the primary car harness 317 of the electromagnetic valve is connected to the canister electromagnetic valve through the right side surface of the box body; carbon tank solenoid valve fixed slot 308 is a hollow square, and the carbon tank solenoid valve is laid on fixed slot 308, holding tank 315 is used for placing the top apron when closing, and its width is 10mm, and the height is 90 mm.
Referring to fig. 4, the OBD detection method for diagnosing the fault of the canister solenoid valve by using the above-mentioned apparatus includes the following steps, the test steps need to be adjusted according to the diagnosis method required by the 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, wherein the soaking environment temperature is 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.
It should be noted that the test principle of the present solution is as follows: under idle speed or steady state operating mode, ECU control carbon tank breather valve closes with the solenoid valve simultaneously, receives the oil tank pressure sensor signal of test vehicle through ECU, and then judges whether evaporation line appears revealing and show relevant fault code through the treater. If the system is normal, the pressure of the oil tank is a constant value, and if the carbon tank electromagnetic valve leaks, the vacuum degree in the oil tank is greatly increased due to the negative pressure of the air inlet manifold, and the ECU judges that a fault occurs.
This scheme provides a leakage amount's analogue means when being used for simulating carbon tank solenoid valve to leak, as for detect through what kind of means leak as above, adopt prior art not the key improvement part of this scheme.
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 (9)
1. The utility model provides a analogue means for car carbon tank solenoid valve failure diagnosis which characterized in that: comprises a solenoid 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 electromagnetic valve is connected with a second connecting port of the first fuel pipeline (310);
the outlet end of the 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 line (311) is provided with a leakage unit comprising a leakage hole (304) provided on the second fuel line (311).
2. The simulation device for fault diagnosis of the electromagnetic valve of the carbon tank of the automobile according to claim 1, wherein: the solenoid valve comprises a canister solenoid valve (301).
3. The simulation device for fault diagnosis of the electromagnetic valve of the carbon tank of the automobile 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 simulation device for fault diagnosis of the electromagnetic valve of the carbon tank of the automobile 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 simulation device for fault diagnosis of the electromagnetic valve of the carbon tank of the automobile 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 simulation device for fault diagnosis of the electromagnetic valve of the carbon tank of the automobile 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 simulation device for fault diagnosis of the electromagnetic valve of the carbon tank of the automobile 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. A simulation system for fault diagnosis of an automobile carbon tank solenoid valve, which is a simulation device for fault diagnosis of an automobile carbon tank solenoid valve according to any one of claims 1 to 6, and is characterized in that: the vehicle-mounted electronic control system further comprises an ECU and a processor, wherein the ECU is an electronic control unit, namely a traveling computer, and the processor is connected with the OBD interface through a USB-CAN communication interface to complete communication with the ECU of the test vehicle and acquire vehicle parameters.
9. A simulation method for fault diagnosis of an automobile carbon tank solenoid valve, a simulation system for fault diagnosis of an automobile carbon tank solenoid valve according to claim 8, 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, wherein the soaking environment temperature is 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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| CN202110486069.XA CN113266497B (en) | 2021-04-30 | 2021-04-30 | Simulation device and method for fault diagnosis of automobile carbon tank electromagnetic valve |
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| CN202110486069.XA CN113266497B (en) | 2021-04-30 | 2021-04-30 | Simulation device and method for fault diagnosis of automobile carbon tank electromagnetic valve |
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2021
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