A new energy automobile electronic oil pump fault processing method

Abstract

The present application relates to a kind of new energy automobile electronic oil pump fault handling method, the method is by defining different oil pump fault grade, receiving and processing input signal, calculating the precondition of various oil pump faults, judge whether the precondition is satisfied by current oil pump fault, judge whether the certain fault number threshold is satisfied by current oil pump fault, calculate the torque limit value of current oil pump fault grade, calculate the recovery condition of current oil pump fault grade, limit motor torque or recover motor torque.The method described in the present application can provide real-time protection for new energy vehicle motor, prevent motor damage caused by motor over-temperature, prolong the life of motor, controller, reducer, and increase the service life of new energy vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicle electronic oil pump, in particular to a new energy vehicle electronic oil pump fault processing method. BACKGROUND

[0002] The electronic oil pump is a key component in new energy vehicles, and is responsible for pushing the cooling oil to circulate between the motor and the cooling system. The motor of the new energy vehicle takes away the heat generated inside the motor through such oil circulation to keep the motor working within an efficient and stable temperature range, thereby prolonging the service life of the motor and the entire new energy vehicle. In addition, the electronic oil pump, while responsible for oil circulation, can also lubricate the motor and the reducer to prevent damage or other faults of the motor or the reducer. The operating condition of the oil pump has a huge impact on the operating condition of the motor system of the new energy vehicle.

[0003] However, the automobile electronic oil pump may have various faults in actual work. In the prior art, there are few descriptions and analyses of the new energy vehicle electronic oil pump fault processing method, and there are deficiencies in the new energy vehicle electronic oil pump fault processing method, and the real-time protection of the new energy vehicle motor is lacking.

[0004] When the new energy vehicle electronic oil pump fails, if it is not handled in time and effectively, the electronic oil pump cannot sufficiently cool the motor and the controller and lubricate the reducer, resulting in damage to the parts in the motor and the controller due to overheating, such as the inability to control the motor speed caused by overheating of the motor controller; insufficient lubrication of the reducer gears, resulting in gear wear; and increased service life of the motor, controller and reducer. SUMMARY

[0005] The purpose of the present application is to solve the problems existing in the prior art, and to provide a new energy vehicle electronic oil pump fault processing method. By defining different oil pump fault levels, receiving and processing input signals, calculating the preconditions of various oil pump faults, determining whether the current oil pump fault meets the preconditions, determining whether the current oil pump fault meets a certain fault frequency threshold, calculating the torque limit value of the current oil pump fault level, calculating the recovery condition of the current oil pump fault level, limiting the motor torque or recovering the motor torque, the new energy vehicle electronic oil pump fault processing method can provide real-time protection for the new energy vehicle motor.

[0006] The technical solution of the present application is as follows:

[0007] A new energy vehicle electronic oil pump fault processing method, comprising the following steps:

[0008] Step 1: receiving and processing electronic oil pump signals

[0009] The received electronic oil pump signal includes an electronic oil pump original fault signal and an electronic oil pump running signal;

[0010] The processed electronic oil pump signal is an oil pump rotating speed response fault when the difference between the rotating speed requested by the oil pump controller and the actual rotating speed of the oil pump is greater than the rotating speed difference threshold value and the duration reaches a certain time threshold value;

[0011] Step 2: Define different oil pump fault levels

[0012] According to different oil pump fault types, define different fault levels, define the fault that does not affect the motor performance as a first-level fault, define the fault that affects the motor cooling performance as a second-level fault, and define the fault that causes the oil pump to stop rotating as a third-level fault;

[0013] The oil pump fault includes the original fault reported by the electronic oil pump original fault signal and the oil pump rotating speed response fault reported after step 1 processing;

[0014] Step 3: Calculate the precondition of different oil pump faults

[0015] The preconditions of the oil pump overload warning, oil pump locked-rotor fault, and oil pump rotating speed response fault are that the oil pump temperature is greater than the temperature threshold value or the oil pump rotating speed is greater than the rotating speed threshold value; The preconditions of the remaining oil pump faults are that the vehicle power-on signal flag meets the requirements;

[0016] Step 4: Determine whether the current oil pump fault meets the precondition of the oil pump fault calculated in step 3; if it meets, go to step 5, if it does not meet, return to step 3;

[0017] Step 5: Define the fault confirmation time threshold value and the fault trigger number threshold value;

[0018] Step 6: Determine whether the fault occurs according to whether the fault confirmation time threshold value or the fault trigger number threshold value is met

[0019] There are two cases to determine whether the fault occurs, if one of the following conditions is met, it is determined that the fault occurs:

[0020] The duration of the current oil pump fault reaches the fault confirmation time threshold value;

[0021] Or the number of fault triggers in one driving cycle reaches the fault trigger number threshold value;

[0022] If it is determined that the fault occurs, go to step 7, if it is not determined that the fault occurs, return to step 5;

[0023] Step 7: Calculate the motor torque limit value of the current oil pump fault

[0024] The motor torque limit value of the current oil pump fault is calculated according to the different oil pump fault levels defined in step 2, when the fault is level 1, no motor torque limitation is performed; when the fault is level 2, certain motor torque limitation is performed; and when the fault is level 3, the motor torque is limited to 0;

[0025] Step 8: Calculate the recovery condition of the current oil pump fault

[0026] The recovery condition of the current oil pump fault is calculated according to the different oil pump fault levels defined in step 2:

[0027] The recovery conditions of the level 1 fault and the level 2 fault are the following two cases,

[0028] The oil pump fault signal stops;

[0029] Or the number of fault triggers of the current oil pump fault in a driving cycle is less than a certain fault number threshold;

[0030] The recovery condition of the level 3 fault is that the vehicle is powered on again;

[0031] Step 9: Determine whether the current oil pump fault meets the recovery condition calculated in step 8; if it meets, go to step 11, if it does not meet, go to step 10;

[0032] Step 10: Limit the motor torque according to the motor torque limit value of the current oil pump fault calculated in step 7, and return to step 9;

[0033] Step 11: Recover the motor torque; remove the limitation on the motor torque.

[0034] Preferably, in step 1, the original fault signals of the electronic oil pump include: oil pump overpressure fault, oil pump underpressure fault, oil pump overtemperature shutdown fault, oil pump current fault, oil pump self-checking fault, oil pump overtemperature derating warning, oil pump communication fault, oil pump stall fault, oil pump overload warning; the operation signals of the electronic oil pump include: oil pump actual speed, oil pump requested speed, motor oil pump temperature, etc.

[0035] Preferably, in step 1, when the cold start of the oil pump is not successful, the oil pump overload warning, the oil pump stall fault, and the oil pump response fault detection are not performed.

[0036] Preferably, in step 2, the level 1 fault includes: oil pump self-checking fault, oil pump overtemperature derating warning;

[0037] The level 2 fault includes: oil pump overload warning, oil pump speed response fault, oil pump overpressure fault, oil pump underpressure fault;

[0038] The level 3 fault includes: oil pump overtemperature shutdown fault, oil pump current fault, oil pump communication fault, oil pump stall fault.

[0039] Preferably, the step 6 and step 8, the calculation method of the number of fault triggers is: once a fault occurs within a certain time, the number of faults is added once; no fault occurs within a certain time, the number of faults is reduced once.

[0040] Preferably, the step 7, the motor torque limit is carried out, specifically the limit motor torque limit value is half of the rated torque of the motor.

[0041] Preferably, the step 10, the torque limit value of the 1st and 2nd level faults is obtained by limiting the output performance of the motor, limiting the maximum operating power of the motor torque, and the 3rd level fault needs to determine whether the current motor speed is greater than the short-circuit threshold, if greater than the short-circuit threshold, the electronic oil pump enters the active short-circuit protection, if less than the short-circuit threshold, the electronic oil pump enters the open-circuit working state.

[0042] By adopting the above scheme, by defining different oil pump fault levels, receiving and processing input signals, calculating various oil pump fault preconditions, judging whether the current oil pump fault meets the preconditions, judging whether the fault occurs, to prevent false triggering of the fault due to signal interference and the like, calculating the torque limit value of the current oil pump fault level, calculating the recovery condition of the current oil pump fault level, limiting the motor torque when the recovery condition is not met to prevent motor failure and damage due to electronic oil pump failure, and recovering the motor torque in time when the recovery condition is met. By judging whether the fault occurs, false triggering of the fault due to signal interference and the like is prevented. When the electronic oil pump fails, at the initial stage of the fault, timely measures are taken for different faults to regulate and control the torque of the motor. By continuously receiving signals of the electronic oil pump, analyzing the signals, excluding false triggering, and timely regulating and controlling the motor torque, the motor is protected in real time. The motor damage caused by over-temperature of the motor is prevented, the service life of the motor, controller and reducer is prolonged, and the service life of the new energy vehicle is increased. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 The flowchart of the present application. DETAILED DESCRIPTION

[0044] Referring to Figure 1 , the new energy vehicle electronic oil pump fault processing method comprises the following steps:

[0045] Step 1: receiving and processing electronic oil pump signals

[0046] The received electronic oil pump signals include electronic oil pump original fault signals and electronic oil pump running signals; the electronic oil pump original fault signals include: oil pump overpressure fault, oil pump underpressure fault, oil pump overtemperature shutdown fault, oil pump current fault, oil pump self-checking fault, oil pump overtemperature derating warning, oil pump communication fault, oil pump locked-rotor fault, and oil pump overload warning; and the electronic oil pump running signals include: oil pump actual rotating speed, oil pump requested rotating speed, and motor oil pump temperature.

[0047] The processed electronic oil pump signals are oil pump rotating speed response faults when the difference between the oil pump controller requested rotating speed and the oil pump actual rotating speed is greater than a rotating speed difference threshold value and the duration reaches a certain time threshold value; in this embodiment, the rotating speed difference threshold value is 1000 revolutions per minute, and the time threshold value is 1 minute.

[0048] When the oil pump cold start is not successful, the oil pump does not perform the oil pump overload warning, oil pump locked-rotor fault, and oil pump response fault detection.

[0049] Step 2: Define different oil pump fault levels

[0050] Different fault levels are defined according to different oil pump fault types. The oil pump fault level is defined according to the severity of the oil pump fault and the impact on the motor. The fault that does not affect the performance of the motor is defined as a first-level fault. The fault that affects the cooling performance of the motor is defined as a second-level fault. The fault that causes the oil pump to stop rotating is defined as a third-level fault.

[0051] The oil pump fault includes the original fault reported by the electronic oil pump original fault signal and the oil pump rotating speed response fault reported after the step 1 processing.

[0052] The first-level fault includes: oil pump self-checking fault and oil pump overtemperature derating warning. The second-level fault includes: oil pump overload warning, oil pump rotating speed response fault, oil pump overpressure fault, and oil pump underpressure fault. The third-level fault includes: oil pump overtemperature shutdown fault, oil pump current fault, oil pump communication fault, and oil pump locked-rotor fault.

[0053] Step 3: Calculate the precondition of different oil pump faults

[0054] The precondition of the oil pump overload warning, oil pump locked-rotor fault, and oil pump rotating speed response fault is that the oil pump temperature is greater than a temperature threshold value or the oil pump rotating speed is greater than a rotating speed threshold value. The precondition of the remaining oil pump faults is that the vehicle power-on signal flag satisfies. In this embodiment, the temperature threshold value is -10°C, and the rotating speed threshold value is 600 revolutions per minute.

[0055] Step 4: Determine whether the current oil pump fault satisfies the precondition of the oil pump fault calculated in step 3. If yes, go to step 5. If no, return to step 3.

[0056] Step 5: define the fault confirmation time threshold and the fault trigger times threshold; for example, the fault confirmation time threshold is set to 1 minute, and the fault trigger times threshold is set to 3 times.

[0057] Step 6: determine whether a fault has occurred according to whether the fault confirmation time threshold or the fault trigger times threshold is met.

[0058] There are two cases for determining whether a fault has occurred. If one of the following conditions is met, it is determined that a fault has occurred:

[0059] The duration of the current oil pump fault reaches the fault confirmation time threshold;

[0060] Or the number of fault triggers within one driving cycle reaches the fault trigger times threshold;

[0061] If it is determined that a fault has occurred, go to Step 7. If it is not determined that a fault has occurred, return to Step 5.

[0062] In this embodiment, the fault times threshold is set to 3 times.

[0063] The calculation method of the fault trigger times is: once a fault occurs within a certain time, the fault times are incremented by one; if no fault occurs within a certain time, the fault times are decremented by one. In this embodiment, the certain time is set to 30 ms.

[0064] Step 6 is used to prevent false triggering of faults due to signal interference and other reasons.

[0065] Step 7: Calculate the motor torque limit value of the current oil pump fault

[0066] According to the different oil pump fault levels defined in Step 2, the motor torque limit value of the current oil pump fault is calculated. When the fault is level 1, no motor torque limit is performed; when the fault is level 2, a certain motor torque limit is performed, which is specifically limiting the motor torque limit value to half of the rated motor torque; when the fault is level 3, the motor torque is limited to 0.

[0067] Step 8: Calculate the recovery condition of the current oil pump fault

[0068] According to the different oil pump fault levels defined in Step 2, the recovery condition of the current oil pump fault is calculated:

[0069] The recovery conditions for level 1 and level 2 faults are as follows:

[0070] The oil pump fault signal stops;

[0071] Or the number of fault triggers of the current oil pump fault within one driving cycle is less than a certain fault times threshold, for example, the fault times threshold is set to 3 times in this embodiment.

[0072] The recovery condition of the third level fault is that the whole vehicle is re-powered;

[0073] The calculation method of the fault triggering times is that the fault times are added once if a fault occurs within 30 ms, and the fault times are reduced once if no fault occurs within 30 ms;

[0074] Step 9: It is judged whether the current oil pump fault meets the recovery condition calculated in step 8; if yes, step 11 is entered, and if no, step 10 is entered;

[0075] Step 10: The motor torque is limited according to the motor torque limit value of the current oil pump fault calculated in step 7, and step 9 is returned; the torque limit value obtained in step 7 is used to limit the output performance of the motor, limit the maximum running power of the motor torque, and the third level fault needs to judge whether the current motor speed is greater than the short-circuit threshold; if yes, the electronic oil pump enters the active short-circuit protection, and if no, the electronic oil pump enters the open-circuit working state; in this embodiment, the short-circuit threshold is set to 4000 revolutions per minute.

[0076] Step 11: The motor torque is recovered; the limitation on the motor torque is removed.

[0077] By continuously receiving the signals of the electronic oil pump, analyzing the signals, preventing the fault from being triggered due to signal interference and the like, and taking targeted measures in a timely manner for different faults, the torque of the motor is adjusted and controlled at any time, and the motor is protected in real time. Embodiment 1

[0078] Step 1: The running signal of the electronic oil pump is received, the speed difference between the oil pump controller request speed and the actual speed of the oil pump is calculated, and if the speed difference is greater than 1000 revolutions per minute and the duration is 1 minute, an oil pump speed response fault signal (hereinafter referred to as “the above-mentioned fault”) is reported;

[0079] Step 2: It is judged that the above-mentioned fault is a first level fault;

[0080] Step 3: The precondition of the above-mentioned fault is calculated as the oil pump temperature being greater than -10℃ or the oil pump speed being greater than 600 revolutions per minute;

[0081] Step 4: It is judged whether the above-mentioned fault meets the precondition; if yes, the next step is entered, and if no, the previous step is returned;

[0082] Step 5: The fault confirmation time threshold is defined as 1 minute, and the fault triggering times threshold is defined as 3 times;

[0083] Step 6: It is judged whether the above-mentioned fault meets one of the following conditions, and then the fault is confirmed to occur:

[0084] The duration of the above fault reaches a fault confirmation time threshold value;

[0085] Or the number of times of triggering the above fault in one driving cycle reaches 3 times;

[0086] If it is confirmed that the fault occurs, go to step 7, if it is not confirmed that the fault occurs, return to step 5;

[0087] The calculation method of the number of times of triggering the above fault is that the number of times of triggering the above fault is added by 1 if the fault occurs within 30 ms, and the number of times of triggering the above fault is reduced by 1 if the fault does not occur within 30 ms;

[0088] Step 7: The fault level of the above fault defined in step 2 is a first-level fault, the response fault limit value of the oil pump speed is calculated, and the motor torque is not limited;

[0089] Step 8: The fault level of the above fault is a first-level fault, and the recovery conditions are as follows,

[0090] The above fault signal stops;

[0091] Or the number of times of triggering the above fault in one driving cycle is less than 3 times;

[0092] Step 9: Determine whether the current above fault meets the recovery condition calculated in step 8; if it meets, go to step 11, if it does not meet, go to step 10;

[0093] Step 10: The motor torque limit of the above fault calculated in step 7 is that the motor torque is not limited, therefore, the output performance of the motor is not limited, and the maximum operating power of the motor torque is not limited.

[0094] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and the changes made by the person skilled in the art to the present application without departing from the spirit of the present application all fall within the protection scope of the present application.

Claims

1. A method for troubleshooting electronic fuel pumps in new energy vehicles, characterized in that: Includes the following steps: Step 1: Receive and process the electronic oil pump signal The received electronic oil pump signals include the electronic oil pump's original fault signal and the electronic oil pump's operating signal; The processed electronic oil pump signal is reported as an oil pump speed response fault when the difference between the oil pump controller's requested speed and the actual oil pump speed is greater than a speed difference threshold and the duration reaches a certain time threshold. Step 2: Define different oil pump failure levels Different fault levels are defined according to different types of oil pump failures. Faults that do not affect motor performance are defined as Level 1 faults, faults that affect motor cooling performance are defined as Level 2 faults, and faults that cause the oil pump to stop rotating are defined as Level 3 faults. Oil pump failures include the original failure reported by the electronic oil pump original failure signal and the oil pump speed response failure reported after processing in step 1. Step 3: Calculate the preconditions for different oil pump failures The prerequisites for the oil pump overload warning, oil pump stall fault, and oil pump speed response fault are that the oil pump temperature is greater than the temperature threshold or the oil pump speed is greater than the speed threshold. The prerequisite for other oil pump failures is that the vehicle power-on signal flag is met; Step 4: Determine whether the current oil pump failure meets the preconditions for oil pump failure calculated in Step 3; if it does, proceed to Step 5; otherwise, return to Step 3. Step 5: Define the fault confirmation time threshold and the fault trigger count threshold; Step 6: Determine whether a fault has occurred based on whether the fault confirmation time threshold or the fault trigger count threshold is met; There are two scenarios to determine if a fault has occurred. A fault is confirmed to have occurred if either of the following conditions is met: The duration of the current oil pump failure has reached the aforementioned failure confirmation time threshold; Or the number of fault triggers within a driving cycle reaches the fault trigger count threshold; If a fault is confirmed, proceed to step 7; otherwise, return to step 5. Step 7: Calculate the motor torque limit value for the current oil pump failure. Calculate the motor torque limit value for the current oil pump fault based on the different oil pump fault levels defined in step 2. When the fault is level 1, no motor torque limit is imposed; when the fault is level 2, a certain motor torque limit is imposed; when the fault is level 3, the motor torque is limited to 0. Step 8: Calculate the recovery conditions for the current oil pump failure. Calculate the recovery conditions for the current oil pump failure based on the different oil pump failure levels defined in step 2: The recovery conditions for Level 1 and Level 2 faults are as follows: The oil pump fault signal has stopped; Or the current oil pump failure triggers less than a certain failure threshold within a driving cycle; The recovery condition for the Level 3 fault is that the entire vehicle is powered back on; Step 9: Determine whether the current oil pump failure meets the recovery conditions calculated in Step 8; if it does, proceed to Step 11; otherwise, proceed to Step 10. Step 10: Limit the motor torque based on the motor torque limit value for the current oil pump failure calculated in Step 7, and return to Step 9; Step 11: Restore motor torque; remove the limit on motor torque.

2. The method for troubleshooting electronic oil pumps in new energy vehicles as described in claim 1, characterized in that: Step 1, the original fault signals of the electronic oil pump include: oil pump overpressure fault, oil pump underpressure fault, oil pump overtemperature shutdown fault, oil pump current fault, oil pump self-test fault, oil pump overtemperature derating warning, oil pump communication fault, oil pump stall fault, and oil pump overload warning; the electronic oil pump operating signals include: oil pump actual speed, oil pump requested speed, motor oil pump temperature, etc.

3. The method for troubleshooting electronic oil pumps in new energy vehicles as described in claim 1, characterized in that: Step 1: When the oil pump fails to start cold, it will not trigger oil pump overload warning, oil pump stall fault detection, or oil pump response fault detection.

4. The method for troubleshooting electronic oil pumps in new energy vehicles as described in claim 1, characterized in that: The Level 1 faults mentioned in step 2 include: oil pump self-test fault and oil pump over-temperature derating warning; The Level 2 faults include: oil pump overload warning, oil pump speed response fault, oil pump overpressure fault, and oil pump underpressure fault. The Level 3 faults include: oil pump over-temperature shutdown fault, oil pump current fault, oil pump communication fault, and oil pump stall fault.

5. The method for troubleshooting electronic oil pumps in new energy vehicles as described in claim 1, characterized in that: In steps 6 and 8, the method for calculating the number of fault triggers is as follows: if a fault occurs within a certain period of time, the number of faults is increased by one; if no fault occurs within a certain period of time, the number of faults is decreased by one.

6. The method for troubleshooting electronic oil pumps in new energy vehicles as described in claim 1, characterized in that: In step 7, the motor torque is limited, specifically by limiting the motor torque limit to half of the motor's rated torque.

7. The method for troubleshooting electronic oil pumps in new energy vehicles as described in claim 1, characterized in that: In step 10, the Level 1 and Level 2 faults are based on the torque limit value obtained in step 7. By limiting the output performance of the motor, the maximum operating power of the motor torque is limited. For the Level 3 fault, it is necessary to determine whether the current motor speed is greater than the short circuit threshold. If it is greater than the short circuit threshold, the electronic oil pump enters active short circuit protection. If it is less than the short circuit threshold, the electronic oil pump enters open circuit operation state.

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