Anti-false-alarm Diagnosis Method and Device for Hybrid Electric Vehicle Off-line

Abstract

The present invention discloses a method for preventing false alarms in the diagnosis of hybrid vehicles during off-line production, which includes: after the vehicle starts, based on the obtained first vehicle information, determining whether the current working condition is an off-line working condition; if it is an off-line working condition, based on the obtained second vehicle information, determining whether the fault shielding function is turned on; if it is not an off-line working condition, then turning off the fault shielding function and restoring normal diagnosis. The present invention also discloses a device for preventing false alarms in the diagnosis of hybrid vehicles during off-line production, which includes a first judgment module, a second judgment module and a fault shielding control module, so as to reduce the probability of false alarms during off-line production, improve the off-line efficiency of different vehicle models, shorten the off-line time and save labor costs.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid electric vehicles, and particularly to a method and device for preventing false alarms in the diagnosis of hybrid electric vehicles during off-line production. Background Art

[0002] When fuel is first injected during the off-line production of a new vehicle, there may be air in the high-pressure fuel rail before the vehicle is first started. The hybrid electric vehicle is towed by the drive motor, and even if there is air in the high-pressure fuel rail, the vehicle can still be successfully started. At this time, the high-pressure fuel rail sensor detects that the oil pressure cannot reach the specified value, and a false alarm of low rail pressure fault will occur.

[0003] In order to control costs, the fuel injected during the off-line production of a new vehicle is usually 5-7L. There may be a situation of repeated over-line and excessive fuel consumption, resulting in high-pressure start failure or low idle speed, thus falsely reporting high-pressure start failure fault or low idle speed fault.

[0004] For the above reasons, false alarms are likely to occur during the off-line production of new vehicles, reducing the off-line efficiency and increasing the labor cost. Summary of the Invention

[0005] Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the present invention is: to provide a method and device for preventing false alarms in the diagnosis of hybrid electric vehicles during off-line production.

[0006] To solve the above technical problem, a technical solution adopted by the present invention is: to provide a method for preventing false alarms in the diagnosis of hybrid electric vehicles during off-line production, including the following steps:

[0007] After the vehicle is started, based on the acquired first vehicle information, determine whether the current working condition is an off-line working condition;

[0008] If it is an off-line working condition, based on the acquired second vehicle information, determine whether to turn on the fault shielding function;

[0009] If it is not an off-line working condition, turn off the fault shielding function and resume normal diagnosis.

[0010] Further, the first vehicle information includes the mileage information of the vehicle, the ECU running time, and the number of engine ignitions.

[0011] In the step of determining whether the current working condition is an off-line working condition: determine whether the vehicle driving mileage, the ECU running time, and the number of engine ignitions meet the off-line working condition requirements;

[0012] If the vehicle driving mileage, the ECU running time, and the number of engine ignitions all meet the off-line working condition requirements, then regard the current working condition as an off-line working condition.

[0013] Further, in the step of determining whether the vehicle driving mileage, the ECU running time, and the engine ignition times meet the off-line working condition requirements, the following sub-steps are included:

[0014] Determine whether the driving mileage is less than the first threshold;

[0015] If the driving mileage is greater than or equal to the first threshold, the current working condition is not the off-line working condition;

[0016] If the driving mileage is less than the first threshold, determine whether the ECU running time is less than the second threshold;

[0017] If the ECU running time is greater than or equal to the second threshold, the current working condition is not the off-line working condition;

[0018] If the ECU running time is less than the second threshold, determine whether the engine ignition times are less than the third threshold;

[0019] If the engine ignition times are greater than or equal to the third threshold, the current working condition is not the off-line working condition;

[0020] If the engine ignition times are less than the third threshold, regard the current working condition as the off-line working condition.

[0021] Further, the second vehicle information includes vehicle fuel level information, rail pressure information, and rotational speed;

[0022] In the step of determining whether to turn on the fault shielding function, determine whether the fuel level information, the rail pressure information, and the rotational speed meet the fault shielding turn-on conditions. If the fault shielding turn-on conditions are met, turn on the fault shielding.

[0023] Further, in the step of determining whether to turn on the fault shielding function, the step of determining whether the fuel level information, the rail pressure information, and the rotational speed meet the fault shielding turn-on conditions includes the following sub-steps:

[0024] Determine whether the rail pressure is less than the fourth threshold;

[0025] If the rail pressure is less than the fourth threshold, determine whether the fuel level is less than the fifth threshold;

[0026] If the fuel level is less than the fifth threshold, shield the high-voltage start failure fault;

[0027] If the fuel level is greater than or equal to the fifth threshold, shield the rail pressure too low fault;

[0028] If the rail pressure is greater than or equal to the fourth threshold, determine whether it meets the condition that the fuel level is less than the fifth threshold and the rotational speed is less than the sixth threshold;

[0029] If the fuel level is less than the fifth threshold and the rotational speed is less than the sixth threshold, shield the idle speed too low fault.

[0030] Further, before determining whether the current working condition belongs to the off-line working condition, the following steps are also included:

[0031] Determine that the basic enabling conditions are met.

[0032] Further, the basic enabling conditions include: the vehicle can start normally, and there are no faults in the fuel level sensor, speed sensor, rail pressure sensor, high-pressure fuel rail, and high-pressure fuel pump.

[0033] Further, after the fault shielding function is started, if the vehicle is powered off, the fault shielding function will be closed with the power-off; after power-on again, the fault shielding function will still be normally opened when the fault shielding function opening conditions are met.

[0034] To solve the above technical problems, another technical solution adopted by the present invention is: to provide a diagnosis device for preventing false alarms during off-line of a hybrid vehicle, including:

[0035] A first judgment module, configured to judge whether the current working condition is an off-line working condition based on the acquired first vehicle information after the vehicle starts;

[0036] A second judgment module, configured to judge whether to turn on the fault shielding function based on the acquired second vehicle information when the first judgment module judges that the current working condition is an off-line working condition;

[0037] A fault shielding control module, configured to turn on the corresponding fault shielding function when the second judgment module judges to turn on the fault shielding function, and is also configured to turn off the fault shielding function and restore normal diagnosis when the first judgment module judges that the current working condition is not an off-line working condition.

[0038] Further, the first vehicle information includes the mileage information of the vehicle, the ECU running time, and the number of engine ignitions;

[0039] The first judgment module is further configured to judge whether the vehicle driving mileage, the ECU running time, and the number of engine ignitions meet the off-line working condition requirements; if the vehicle driving mileage, the ECU running time, and the number of engine ignitions all meet the off-line working condition requirements, the current working condition is regarded as an off-line working condition.

[0040] The second vehicle information includes the vehicle fuel level information, the rail pressure information, and the speed.

[0041] The second judgment module is further configured to judge whether the fuel level information, the rail pressure information, and the speed meet the fault shielding opening conditions; if the fuel level information, the rail pressure information, and the speed meet the fault shielding opening conditions, it is judged to turn on the fault shielding function.

[0042] The anti-false-alarm diagnosis method and device for the hybrid vehicle off-line of the present invention have at least the following beneficial effects: By judging the current working conditions and enabling different shielding functions under different working conditions, the present invention can effectively reduce the false alarms of faults caused by vehicle working conditions without increasing the hardware cost, and solve the problems in the prior art that there is air in the fuel rail when fuel is first injected during the off-line of new vehicles and repeated over-production line fuel flushing leads to false alarm faults, reducing the off-line efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0044] Figure 1 It is a flowchart of an embodiment of the anti-false-alarm diagnosis method for the hybrid vehicle off-line of the present invention.

[0045] Figure 2 is Figure 1 a flowchart of step S110 in

[0046] Figure 3 is Figure 1 a flowchart for judging whether the oil level information, rail pressure information and rotational speed meet the fault shielding opening conditions in step S120.

[0047] Figure 4 It is a flowchart of an embodiment of the anti-false-alarm diagnosis method for the hybrid vehicle off-line of the present invention.

[0048] Figure 5 It is a structural block diagram of the anti-false-alarm diagnosis device for the hybrid vehicle off-line of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0049] The present invention will be further described below with reference to the drawings.

[0050] Please refer to Figure 1 , which is a flowchart of an embodiment of the anti-false-alarm diagnosis method for the hybrid vehicle off-line of the present invention. This embodiment specifically includes the following steps:

[0051] S110. After the vehicle is started, based on the acquired first vehicle information, judge whether the current working condition is an off-line working condition.

[0052] The first vehicle information includes, but is not limited to, the mileage information of the vehicle, the ECU running time, and the number of engine ignitions. Generally, a vehicle will have a Controller Area Network (CAN) for judging and processing various signals and information. The Engine Management System (EMS) in the vehicle is used to process and analyze data related to the engine. Therefore, in this embodiment, the vehicle driving mileage signal is sent to the CAN, while the ECU running time and the number of engine ignitions are directly obtained inside the EMS, and finally the EMS is used to determine whether the current vehicle condition is an off-line condition.

[0053] Please refer to Figure 2 , this step S110 includes the following sub-steps:

[0054] S111. Determine whether the driving mileage is less than the first threshold;

[0055] S112. If the driving mileage is greater than or equal to the first threshold, the current condition is not an off-line condition;

[0056] S113. If the driving mileage is less than the first threshold, determine whether the ECU running time is less than the second threshold;

[0057] S114. If the ECU running time is greater than or equal to the second threshold, the current condition is not an off-line condition;

[0058] S115. If the ECU running time is less than the second threshold, determine whether the number of engine ignitions is less than the third threshold;

[0059] S116. If the number of engine ignitions is greater than or equal to the third threshold, the current condition is not an off-line condition;

[0060] S117. If the number of engine ignitions is less than the third threshold, regard the current condition as an off-line condition.

[0061] In the early stage of trial assembly on the production line, the above three thresholds can be adjusted according to the results of the first batch of trial assemblies, and the specific thresholds can be determined in combination with the actual situation. In this embodiment, the first threshold is taken as 10 km. For newly produced vehicles off the line, the ECUs are newly flashed on the production line, and the ECU running time will not be particularly long. Therefore, the second threshold is taken as 65535 s, and the third threshold is taken as 65535 times. These thresholds can ensure that the engine actually starts and can ensure that the air in the fuel rail can be excluded. This is only for the case where the air can be quickly discharged, that is, the process of the vehicle discharging the air will be very fast and will not last for a long time. If the air cannot be discharged due to mechanical reasons and the rail pressure remains low continuously, the driving experience of the vehicle is very poor and it should not be continuously shielded to prevent vehicles with real problems from flowing into the market.

[0062] In actual after-sales vehicles, other operations such as mileage brushing may exist. To prevent after-sales vehicles from accidentally entering the off-line identification working condition and failing to meet the regulatory requirements for monitoring high-voltage components. In this step, when any one of the vehicle mileage, ECU running time, and engine ignition times signals cannot be less than the corresponding threshold, it does not belong to the off-line working condition.

[0063] Before determining whether the current working condition belongs to the off-line working condition, the following steps are also included: determining that the basic enabling conditions are met. The basic enabling conditions include: the vehicle can start normally, and the oil level sensor, speed sensor, rail pressure sensor, high-pressure oil rail, and high-pressure oil pump are free of faults.

[0064] When the vehicle cannot start normally or any of the liquid level sensor, speed sensor, and high-voltage engine components has a fault, the basic enabling conditions are not met. Even if it is actually off the production line, it should not be identified as the off-line working condition to avoid the inability to detect real faults during the assembly process.

[0065] S120. If it is the off-line working condition, based on the obtained second vehicle information, determine whether to turn on the fault shielding function.

[0066] The second vehicle information includes but is not limited to vehicle oil level information, rail pressure information, and speed.

[0067] In the step of determining whether to turn on the fault shielding function, determine whether the oil level information, rail pressure information, and speed meet the fault shielding opening conditions. If the fault shielding opening conditions are met, turn on the fault shielding.

[0068] Please refer to Figure 3 , in this step S120, the step of determining whether the oil level information, rail pressure information, and speed meet the fault shielding opening conditions includes the following sub-steps:

[0069] S121. Determine whether the rail pressure is less than the fourth threshold;

[0070] S122. If the rail pressure is less than the fourth threshold, determine whether the oil level is less than the fifth threshold;

[0071] S123. If the oil level is less than the fifth threshold, shield the high-voltage start failure fault;

[0072] S124. If the oil level is greater than or equal to the fifth threshold, shield the rail pressure too low fault;

[0073] If the rail pressure is diagnosed as too low and deviates from the target rail pressure, the engine will pull the rail pressure up, which may cause problems with unreasonable control. Therefore, shielding the rail pressure too low fault here can also avoid subsequent problems.

[0074] S125. If the rail pressure is greater than or equal to the fourth threshold, determine whether the fuel level is less than the fifth threshold and the engine speed is less than the sixth threshold.

[0075] S126. If the fuel level is less than the fifth threshold and the engine speed is less than the sixth threshold, mask the fault of low idle speed.

[0076] If the rail pressure, fuel level, and engine speed do not meet the above conditions, there is no need to mask the fault, and the fault masking function is not turned on.

[0077] The masked faults include faults under the catalytic converter heating condition and faults under non-catalytic converter heating conditions.

[0078] The thresholds for fuel level, rail pressure, engine speed, etc. need to be calibrated according to different vehicles to select appropriate thresholds. In this embodiment, the value of the fourth threshold is 5 MPa less than the target rail pressure, the fifth threshold is 2 L, and the value of the sixth threshold is 200 rpn less than the target engine speed.

[0079] The fault masking activation conditions in this embodiment can distinguish between two reasons for false fault reports: insufficient fuel due to repeated passing of the production line for special reasons during vehicle production and air in the fuel rail. When the rail pressure is less than the fourth threshold, if the fuel level is less than the fifth threshold, it indicates that the high-pressure start fails due to actual lack of fuel. If the fuel level is greater than or equal to the fifth threshold, the influence of the fuel level can be excluded, indicating that the low rail pressure is caused by air in the fuel rail. If the fuel level is less than the fifth threshold and the engine speed is less than the sixth threshold, it indicates that the low engine speed is caused by actual lack of fuel.

[0080] S130. If it is not the off-line condition, turn off the fault masking function and resume normal diagnosis.

[0081] By judging the current working condition and activating different fault masking functions under different working conditions, the embodiment of the present invention can solve the problem of false fault reports caused by air in the fuel rail during the first fuel injection or insufficient fuel due to repeated off-line during new vehicle off-line, reduce the probability of false fault reports during off-line, improve the off-line efficiency of different vehicle models, shorten the off-line time, and save labor costs.

[0082] Please refer to Figure 4 , which is a flowchart of an embodiment of the anti-false alarm diagnosis method for hybrid vehicle off-line of the present invention. This embodiment specifically includes the following steps:

[0083] S210. After the vehicle starts, based on the acquired first vehicle information, determine whether the current working condition is the off-line condition.

[0084] S220. If it is the off-line condition, based on the acquired second vehicle information, determine whether to turn on the fault masking function.

[0085] S230. After the fault shielding function is turned on, if the vehicle is powered off, the shielding function will be turned off along with the power-off.

[0086] S240. After powering on again, repeat steps S210 - S220. When the conditions for turning on the fault shielding function are met, the shielding function will still be turned on normally.

[0087] S250. If it is not the off-line working condition, turn off the fault shielding function and resume normal diagnosis.

[0088] In the embodiment of the present invention, after the fault shielding function is turned on, when the vehicle is powered off and then powered on again, when the conditions for turning on the fault shielding function are met, the shielding function will still be turned on normally. This makes the off-line shielding applicable not only to the first start-up but also to the entire off-line process, and can avoid false fault alarms after restart.

[0089] Please refer to Figure 5 , which is the structural block diagram of the off-line anti-false-alarm diagnosis device for the hybrid vehicle of the present invention. The off-line anti-false-alarm diagnosis device for the hybrid vehicle includes:

[0090] The first judgment module 110 is used to judge whether the current working condition is the off-line working condition based on the acquired first vehicle information after the vehicle starts.

[0091] The first vehicle information includes the mileage information of the vehicle, the ECU running time, and the number of engine ignitions. The first judgment module 110 is also used to judge whether the vehicle driving mileage, the ECU running time, and the number of engine ignitions meet the off-line working condition requirements; if the vehicle driving mileage, the ECU running time, and the number of engine ignitions all meet the off-line working condition requirements, the current working condition is regarded as the off-line working condition.

[0092] In this embodiment, the first judgment module 110 includes the following sub-modules:

[0093] The first judgment sub-module 111 is used to judge whether the driving mileage is less than the first threshold;

[0094] The second judgment sub-module 112 is used to judge whether the ECU running time is less than the second threshold;

[0095] The third judgment sub-module 113 is used to judge whether the number of engine ignitions is less than the third threshold.

[0096] The second judgment module 120 is used to judge whether to turn on the fault shielding function based on the acquired second vehicle information when the first judgment module judges that the current working condition is the off-line working condition.

[0097] The second vehicle information includes vehicle fuel level information, rail pressure information, and rotational speed. The second judgment module is further configured to judge whether the fuel level information, rail pressure information, and rotational speed meet the fault shielding opening condition; if the fuel level information, rail pressure information, and rotational speed meet the fault shielding opening condition, then judge to turn on the fault shielding function.

[0098] In this embodiment, the second judgment module 120 includes the following sub-modules:

[0099] The fourth judgment sub-module 121 is configured to judge whether the rail pressure is less than a fourth threshold value;

[0100] The fifth judgment sub-module 122 is configured to judge whether the fuel level is less than a fifth threshold value;

[0101] The sixth judgment sub-module 123 is configured to judge whether the rotational speed is less than a sixth threshold value.

[0102] The fault shielding control module 130 is configured to turn on the corresponding fault shielding function when the second judgment module judges to turn on the fault shielding function, and is further configured to turn off the fault shielding function and resume normal diagnosis when the first judgment module judges that the current working condition is not the off-line working condition.

[0103] In this embodiment, the fault shielding control module 130 includes the following sub-modules:

[0104] The first fault shielding control sub-module 131 is configured to control the closing of the fault shielding function;

[0105] The second fault shielding control sub-module 132 is configured to control the opening of the high-voltage start failure fault shielding function; the third fault shielding control sub-module 133 is configured to control the opening of the rail pressure low fault shielding function;

[0106] The fourth fault shielding control sub-module 134 is configured to control the opening of the idle speed low fault shielding function;

[0107] In the present invention, the first judgment module and the second judgment module are used to perform conditional judgment on the current working condition, and the fault shielding control module turns on the corresponding fault shielding function under different working condition conditions, which can solve the problems in the prior art that there is air in the fuel rail when the new vehicle is off the line and the first fuel is injected, and the fuel is not enough due to repeated passing through the production line, resulting in false fault reports and reducing the off-line efficiency. It can reduce the probability of false fault reports during off-line, improve the off-line efficiency of different vehicle models, shorten the off-line time, and save labor costs.

Claims

1. A method for diagnosing false alarm prevention during the offline of a hybrid vehicle, characterized in that, It includes the following steps: After the vehicle starts, based on the acquired first vehicle information, determine whether the current working condition is an off-line working condition; If it is an off-line working condition, based on the acquired second vehicle information, determine whether to turn on the fault shielding function; If it is not an off-line working condition, then turn off the fault shielding function and resume normal diagnosis; The second vehicle information includes vehicle fuel level information, rail pressure information, and engine speed; In the step of determining whether to turn on the fault shielding function, determine whether the fuel level information, rail pressure information, and engine speed meet the fault shielding turn-on conditions. If the fault shielding turn-on conditions are met, then turn on the fault shielding; In the step of determining whether to turn on the fault shielding function, the step of determining whether the fuel level information, rail pressure information, and engine speed meet the fault shielding turn-on conditions includes the following sub-steps: Determine whether the rail pressure is less than the fourth threshold; If the rail pressure is less than the fourth threshold, then determine whether the fuel level is less than the fifth threshold; If the fuel level is less than the fifth threshold, then shield the high-voltage start failure fault; If the fuel level is greater than or equal to the fifth threshold, then shield the low rail pressure fault; If the rail pressure is greater than or equal to the fourth threshold, then determine whether it meets the condition that the fuel level is less than the fifth threshold and the engine speed is less than the sixth threshold; If the fuel level is less than the fifth threshold and the engine speed is less than the sixth threshold, then shield the low idle speed fault.

2. The method for diagnosing anti-false alarm during the off-line of a hybrid vehicle according to claim 1, wherein: The first vehicle information includes vehicle mileage, ECU operation time, and engine ignition times; In the step of determining whether the current working condition is an off-line working condition: determine whether the vehicle mileage, ECU operation time, and engine ignition times meet the off-line working condition requirements; If the vehicle mileage, ECU operation time, and engine ignition times all meet the off-line working condition requirements, then regard the current working condition as an off-line working condition.

3. The off-line anti-false-alarm diagnosis method for hybrid electric vehicles according to claim 2, wherein In the step of determining whether the vehicle mileage, ECU operation time, and engine ignition times meet the off-line working condition requirements, it includes the following sub-steps: Determine whether the mileage is less than the first threshold; If the mileage is greater than or equal to the first threshold, then the current working condition is not an off-line working condition; If the mileage is less than the first threshold, then determine whether the ECU operation time is less than the second threshold; If the ECU operation time is greater than or equal to the second threshold, then the current working condition is not an off-line working condition; If the ECU operation time is less than the second threshold, then determine whether the engine ignition times are less than the third threshold; If the engine ignition times are greater than or equal to the third threshold, then the current working condition is not an off-line working condition; If the engine ignition times are less than the third threshold, then regard the current working condition as an off-line working condition.

4. The off-line anti-false-alarm diagnosis method for hybrid electric vehicles according to claim 1, wherein Before determining whether the current working condition belongs to an off-line working condition, it further includes the following steps: Determine that the basic enabling conditions are met.

5. The anti-false alarm diagnosis method for a hybrid vehicle during off-line as described in claim 4, characterized in that, The basic enabling conditions include: the vehicle can start normally, and there are no faults with the fuel level sensor, engine speed sensor, rail pressure sensor, high-pressure fuel rail, and high-pressure fuel pump.

6. The off-line false alarm prevention diagnosis method for a hybrid vehicle according to any one of claims 1 to 4, characterized in that After the fault shielding function is turned on, if the vehicle is powered off, the fault shielding function will be turned off with the power-off; after power-on again, when the fault shielding function turn-on conditions are met, the fault shielding function will still be normally turned on.

7. A diagnosis device for preventing false alarms during the offline of a hybrid vehicle, characterized in that, It includes: A first judgment module, used to determine whether the current working condition is an off-line working condition after the vehicle starts, based on the acquired first vehicle information; The second judgment module is used to judge whether to turn on the fault shielding function based on the acquired second vehicle information when the first judgment module judges that the current working condition is the off-line working condition; The fault shielding control module is used to turn on the corresponding fault shielding function when the second judgment module judges to turn on the fault shielding function, and is also used to turn off the fault shielding function and resume normal diagnosis when the first judgment module judges that the current working condition is not the off-line working condition; The first vehicle information includes vehicle driving mileage, ECU operation time, and engine ignition times; The first judgment module is further used to judge whether the vehicle driving mileage, ECU operation time, and engine ignition times meet the off-line working condition requirements; if the vehicle driving mileage, ECU operation time, and engine ignition times all meet the off-line working condition requirements, the current working condition is regarded as the off-line working condition; The second vehicle information includes vehicle fuel level information, rail pressure information, and rotational speed; The second judgment module is further used to judge whether the fuel level information, rail pressure information, and rotational speed meet the fault shielding activation conditions; If the fuel level information, rail pressure information, and rotational speed meet the fault shielding activation conditions, it is judged to turn on the fault shielding function.

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