CN114337380B - Method and system for detecting locked rotor fault of electronic oil pump motor - Google Patents
Method and system for detecting locked rotor fault of electronic oil pump motor Download PDFInfo
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Abstract
The invention provides a method and a system for detecting a locked rotor fault of an electronic oil pump motor, comprising the following steps: acquiring a target working condition and counter electromotive force of an electronic oil pump motor during operation; determining a target threshold range corresponding to a target working condition in a preset corresponding relation table; the preset corresponding relation table is a corresponding relation table between the working condition of the electronic oil pump motor and the counter electromotive force threshold range; judging whether the counter electromotive force exceeds a target threshold range k times in a FOC control period; k is a function taking the rotating speed of the electronic oil pump motor as an independent variable, and the value of k is a positive integer; if so, determining that the electronic oil pump motor has a locked-rotor fault. The invention relieves the technical problem of inaccurate fault detection under complex working conditions in the prior art.
Description
Technical Field
The invention relates to the technical field of electronic oil pump fault detection, in particular to a method and a system for detecting a locked rotor fault of an electronic oil pump motor.
Background
The motor of the electronic oil pump of the automobile can encounter the fault of locked rotor in the actual work, the instantaneous current of the stator when the motor is locked rotor can far exceed the rated current, and the motor of the electronic oil pump and the controller can be burnt in serious conditions. The Control method of the motor of the electronic oil pump mainly adopts a FOC (Field-Oriented Control) method based on vector Control, namely a magnetic Field directional Control algorithm, and the motor stall fault is diagnosed and detected in the prior art, and the current, the rotating speed and the counter electromotive force are mainly used for detection so as to ensure the safety and the reliability of a Control system.
In a motor stall detection algorithm based on back electromotive force, the back electromotive force of an alpha beta shaft of a motor is in a normal section when the motor works normally, an actual back electromotive force observed value deviates from the normal section when the motor stalls, and a stall fault can be detected. However, the method can only be effective for a single motor and a single working condition, increases of load inertia, fluctuation of working voltage and working current and shaking of motor output rotating speed, and an original threshold value may not meet detection requirements, so that the technical problem of inaccurate fault detection under complex working conditions is caused.
Disclosure of Invention
Therefore, the invention aims to provide a method and a system for detecting the locked rotor fault of an electronic oil pump motor, so as to solve the technical problem of inaccurate fault detection under complex working conditions in the prior art.
In a first aspect, an embodiment of the present invention provides a method for detecting a locked rotor fault of an electronic oil pump motor, including: acquiring a target working condition and counter electromotive force of an electronic oil pump motor during operation; determining a target threshold range corresponding to the target working condition in a preset corresponding relation table; the preset corresponding relation table is a corresponding relation table between the working condition of the electronic oil pump motor and a counter electromotive force threshold range; judging whether the counter electromotive force exceeds the target threshold range k times in one FOC control period; k is a function taking the rotating speed of the electronic oil pump motor as an independent variable, and the value of k is a positive integer; if so, determining that the electronic oil pump motor has a locked rotor fault.
Further, the method further comprises: if the back electromotive force is judged to be in a FOC control period and does not exceed the target threshold range k times, acquiring the actual rotation speed of the electronic oil pump motor, and determining the rotation speed difference between the actual rotation speed and the set rotation speed of the electronic oil pump motor; judging whether the rotation speed difference is smaller than a preset rotation speed threshold value or not; if yes, determining that the electronic oil pump motor has no locked rotor fault; if not, determining that the electronic oil pump motor has a locked rotor fault.
Further, acquiring a back electromotive force of the electronic oil pump motor during operation, including: and acquiring the back electromotive force through a sliding mode observer.
Further, the method further comprises: sampling a back electromotive force curve of the electronic oil pump motor under different working conditions based on a sliding mode observer to obtain an initial back electromotive force curve; calibrating an initial threshold range based on the initial back electromotive force curve to obtain an initial corresponding relation table; and optimizing the initial corresponding relation table based on a test calibration method to obtain the preset corresponding relation table.
Further, optimizing the initial correspondence table based on a test calibration method includes: dividing the test interval of the working condition of the electronic oil pump at preset intervals to obtain a plurality of working condition test points; the working conditions of the electronic oil pump motor comprise: the load moment of inertia, input the direct current busbar voltage, the load torque; starting the electronic oil pump motor to run in a fault-free state under the working condition corresponding to the first working condition test point; the first working condition test point is one test point of the plurality of working condition test points; performing locked-rotor fault detection on the electronic oil pump motor based on an initial threshold range corresponding to the first working condition test point in the initial correspondence table; if the occurrence of the locked rotor fault of the electronic oil pump motor is detected, the initial threshold range is lifted and updated by a preset percentage until the locked rotor fault is not detected; if the locked rotor fault of the electronic oil pump motor is not detected, optimizing an initial threshold range corresponding to the next test point of the first working condition test point.
In a second aspect, an embodiment of the present invention further provides a system for detecting a locked rotor fault of an electronic oil pump motor, including: the device comprises an acquisition module, a determination module and a detection module; the acquisition module is used for acquiring a target working condition and counter electromotive force of the electronic oil pump motor during operation; the determining module is used for determining a target threshold range corresponding to the target working condition in a preset corresponding relation table; the preset corresponding relation table is a corresponding relation table between the working condition of the electronic oil pump motor and a counter electromotive force threshold range; the detection module is used for judging whether the counter electromotive force exceeds the target threshold range k times in a FOC control period; k is a function taking the rotating speed of the electronic oil pump motor as an independent variable, and the value of k is a positive integer; if so, determining that the electronic oil pump motor has a locked rotor fault.
Further, the detection module is further configured to: if the back electromotive force is judged to be in a FOC control period and does not exceed the target threshold range k times, acquiring the actual rotation speed of the electronic oil pump motor, and determining the rotation speed difference between the actual rotation speed and the set rotation speed of the electronic oil pump motor; judging whether the rotation speed difference is smaller than a preset rotation speed threshold value or not; if yes, determining that the electronic oil pump motor has no locked rotor fault; if not, determining that the electronic oil pump motor has a locked rotor fault.
Further, the system further comprises: an optimization module; the optimization module comprises: the device comprises a sampling unit, a calibration unit and an optimization unit; the sampling unit is used for sampling the counter electromotive force curve of the electronic oil pump motor under different working conditions based on a sliding mode observer to obtain an initial counter electromotive force curve; the calibration unit is used for calibrating an initial threshold range based on the initial back electromotive force curve to obtain an initial corresponding relation table; the optimizing unit is used for optimizing the initial corresponding relation table based on a test calibration method to obtain the preset corresponding relation table.
Further, the optimizing unit is further configured to: dividing the test interval of the working condition of the electronic oil pump at preset intervals to obtain a plurality of working condition test points; the working conditions of the electronic oil pump motor comprise: the load moment of inertia, input the direct current busbar voltage, the load torque; starting the electronic oil pump motor to run in a fault-free state under the working condition corresponding to the first working condition test point; the first working condition test point is one test point of the plurality of working condition test points; performing locked-rotor fault detection on the electronic oil pump motor based on an initial threshold range corresponding to the first working condition test point in the initial correspondence table; if the occurrence of the locked rotor fault of the electronic oil pump motor is detected, the initial threshold range is lifted and updated by a preset percentage until the locked rotor fault is not detected; if the locked rotor fault of the electronic oil pump motor is not detected, optimizing an initial threshold range corresponding to the next test point of the first working condition test point.
In a third aspect, an embodiment of the present invention further provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor executes the computer program to implement the steps of the method described in the first aspect.
The invention provides a method and a system for detecting a locked rotor fault of an electronic oil pump motor, which are capable of adapting to different working conditions and different electronic oil pump bodies by determining a target threshold range corresponding to a target working condition in a preset corresponding relation table and detecting the locked rotor fault of the electronic oil pump motor based on the target threshold range, thereby improving the use range of a control system and relieving the technical problem of inaccurate fault detection under complex working conditions in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for detecting a locked rotor fault of an electronic oil pump motor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a sliding mode observer according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a detection threshold value of a locked rotor fault of an electronic oil pump motor according to an embodiment of the present invention;
FIG. 4 is a flowchart of a preset mapping table optimizing method according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a locked rotor fault detection system of an electronic oil pump motor according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an optimization module according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
fig. 1 is a flowchart of a method for detecting a locked rotor fault of an electronic oil pump motor according to an embodiment of the present invention. As shown in fig. 1, the method specifically includes the following steps:
step S102, the target working condition and counter electromotive force of the electronic oil pump motor during operation are obtained.
Alternatively, in an embodiment of the present invention, the back emf is acquired by a Sliding Mode Observer (SMO). The counter electromotive force is the q-axis counter electromotive force of the electronic oil pump motor.
Step S104, determining a target threshold range corresponding to a target working condition in a preset corresponding relation table; the preset corresponding relation table is a corresponding relation table between the working condition of the electronic oil pump motor and the counter electromotive force threshold range.
Step S106, judging whether the counter electromotive force exceeds a target threshold range k times in one FOC control period; k is a function taking the rotating speed of the electronic oil pump motor as an independent variable, and the value of k is a positive integer. If yes, go to step S114; if not, step S108 is performed.
Optionally, in the embodiment of the present invention, k= [ n/5000×t ], [ ] is a rounding function, n is a rotation speed of the electric oil pump motor, and t is a FOC control period.
Step S108, obtaining the actual rotation speed of the electronic oil pump motor, and determining the rotation speed difference between the actual rotation speed and the set rotation speed of the electronic oil pump motor.
Step S110, judging whether the rotation speed difference is smaller than a preset rotation speed threshold value; if yes, go to step S112; if not, step S114 is performed.
Optionally, in an embodiment of the present invention, a rotation speed threshold n is preset 0 ＝[n/100]。
Step S112, determining that the electronic oil pump motor has no locked-rotor fault.
Step S114, determining that the electronic oil pump motor has a locked rotor fault.
The invention provides a method for detecting the locked rotor fault of an electronic oil pump motor, which comprises the steps of determining a target threshold range corresponding to a target working condition in a preset corresponding relation table, and detecting the locked rotor fault of the electronic oil pump motor based on the target threshold range, so that the method can adapt to different working conditions and different electronic oil pump bodies, improves the use range of a control system, and relieves the technical problem of inaccurate fault detection under complex working conditions in the prior art.
Fig. 2 is a schematic diagram of a sliding mode observer according to an embodiment of the present invention. When the method provided by the embodiment of the invention is used for detecting the motor locked-rotor fault, the electronic oil pump motor is firstly enabled to stably run at the rotating speed n, the q-axis counter electromotive force under the current working condition of the electronic oil pump motor is calculated by utilizing the SMO shown in the figure 1, if the counter electromotive force exceeds the target threshold range for a certain number of times, the locked-rotor fault is fed back, if the counter electromotive force meets the normal working requirement, the rotating speed deviation judgment is carried out, if the counter electromotive force exceeds the preset rotating speed threshold, the system locked-rotor fault is judged, and otherwise, the system is normal.
In actual work, because the electronic oil pump motor needs to drive the oil pump body, often an electronic oil pump motor and an electronic oil pump controller need to be matched with a plurality of oil pump bodies, the control strategy of the electronic oil pump motor needs to be high in adaptability. Under the operating condition of the electronic oil pump, the pressure of the oil pump is continuously increased along with the increase of the rotating speed, and the load torque of the motor is correspondingly increased. The q-axis back electromotive force is influenced by the load moment of inertia and the load torque, so that optimization adjustment is needed, and the adaptability of an algorithm is improved.
Optionally, the method provided by the embodiment of the invention further comprises the following steps:
step S202, a back electromotive force curve of the electronic oil pump motor under different working conditions is sampled based on a sliding mode observer, and an initial back electromotive force curve is obtained.
And S204, calibrating an initial threshold range based on the initial back electromotive force curve to obtain an initial corresponding relation table.
Alternatively, the lower and upper limits of the counter electromotive force threshold for the locked-rotor fault detection are determined according to formulas eq× (1-epsilon) and eq× (1+epsilon), resulting in an initial threshold range. Optionally, fig. 3 is a schematic diagram of a motor stalling fault detection threshold of an electronic oil pump according to an embodiment of the present invention.
Step S206, optimizing the initial corresponding relation table based on the test calibration method to obtain a preset corresponding relation table.
Specifically, fig. 4 is a flowchart of a preset correspondence table optimization method according to an embodiment of the present invention. As shown in fig. 4, step S206 further specifically includes the following steps:
step S41, dividing a test interval of the working condition of the electronic oil pump at preset intervals to obtain a plurality of working condition test points; the working conditions of the electronic oil pump motor comprise: and the load moment of inertia, input direct current bus voltage and load torque.
Step S42, starting the electronic oil pump motor to run under the working condition corresponding to the first working condition test point and in a fault-free state; the first working condition test point is one test point of a plurality of working condition test points.
And step S43, performing locked-rotor fault detection on the electronic oil pump motor based on the initial threshold range corresponding to the first working condition test point in the initial corresponding relation table.
Step S44, judging whether the locked rotor fault of the electronic oil pump motor is detected; if the occurrence of the locked rotor fault of the electronic oil pump motor is detected, executing a step S45; if no stalling fault of the electronic oil pump motor is detected, step S46 is performed.
Step S45, the initial threshold range is lifted and updated by a preset percentage until no locked-rotor fault is detected.
Step S46, optimizing an initial threshold range corresponding to the next test point of the first working condition test point.
Specifically, in the embodiment of the invention, statistics is performed by adopting a point-by-point linear table lookup method, testing is performed at intervals of 500rpm, under the condition of setting the rotating speed, a counter electromotive force curve of the current working condition is firstly sampled according to an SMO observer, and the lower limit and the upper limit of a counter electromotive force threshold value for detecting the locked rotor fault are determined according to formulas Eq× (1-epsilon) and Eq× (1+epsilon). After determining the threshold range, optimizing the threshold range, firstly lifting the load moment of inertia of the electronic oil pump motor, using the calibrated counter electromotive force threshold range to perform locked-rotor detection, entering the next optimization stage if no locked-rotor fault is detected under the normal operation condition, indicating that the threshold range needs to be optimized if the locked-rotor fault is detected, and lifting the upper limit and the lower limit of the set threshold value
k is the number of times of cyclic test, the motor of the electronic oil pump is restarted to perform locked rotor fault detection, if no locked rotor fault is detected, the next step of optimization project is entered, and if detection is performedAnd if the locked rotor fails, repeating the flow.
The second optimizing item in the strategy is the input direct current bus voltage of the electronic oil pump, the direct current bus voltage input by the test is lifted, if no locked rotor fault is detected, the next optimizing item is entered, if the locked rotor fault is detected, the counter electromotive force threshold value is optimized, and the upper limit and the lower limit of the set threshold value are lifted
And k is the number of the cyclic tests, the motor of the electronic oil pump is restarted to perform locked rotor detection, if no locked rotor is detected, the next step of optimization project is started, and if a locked rotor fault is detected, the process is repeated.
The last optimization project is aimed at the load torque born by the motor of the electronic oil pump, the load torque applied to the motor of the electronic oil pump during the lifting test is carried out, if no fault-reporting fault occurs, the next optimization project is entered, if fault-reporting fault occurs, the counter electromotive force threshold value is optimized, and the upper limit and the lower limit of the set threshold value are lifted
And k is the number of the cyclic tests, the motor of the electronic oil pump is restarted to perform locked rotor fault detection, if no locked rotor fault is detected, the next step of optimization project is started, and if the locked rotor fault is detected, the process is repeated.
Because the test algorithm provided by the embodiment of the invention adopts the test calibration optimization with 500rpm as the interval, the linear table lookup method is adopted in the interval in the middle of the calibration point, and the blocking counter electromotive force threshold value is obtained through the corresponding proportion formula.
As can be seen from the above description, the embodiment of the invention provides a method for detecting a locked rotor fault of an electronic oil pump motor, and the method is optimized under three optimization conditions aiming at a fault threshold, so that the locked rotor fault diagnosis strategy has applicability and optimality, the accuracy of locked rotor detection can be ensured when the electronic oil pump is replaced with different pump bodies and works in different working intervals, and the reliability of a system is improved. Compared with the prior art, the method provided by the embodiment of the invention has the following technical effects:
1. the high-speed running safety of the electronic oil pump can be ensured, and the system safety is improved;
2. the calibration test and optimization method is added, so that the electronic oil pump can adapt to different working conditions and different electronic oil pump bodies, and the application range of a control system is improved;
3. the blocking failure judgment is carried out based on the counter electromotive force, and the electronic oil pump rotating speed is used for correction, so that the detection precision of a blocking detection algorithm can be improved;
4. the method provided by the embodiment of the invention is used for carrying out hardware physical analysis on the basis of the simulation analysis of the traditional electronic oil pump motor test, and is more accurate and reliable.
Embodiment two:
fig. 5 is a schematic diagram of a locked rotor fault detection system of an electronic oil pump motor according to an embodiment of the present invention. As shown in fig. 5, the system includes: the device comprises an acquisition module 10, a determination module 20 and a detection module 30.
Specifically, the acquiring module 10 is configured to acquire a target working condition and a counter electromotive force of the electronic oil pump motor during operation.
The determining module 20 is configured to determine, in a preset correspondence table, a target threshold range corresponding to a target working condition; the preset corresponding relation table is a corresponding relation table between the working condition of the electronic oil pump motor and the counter electromotive force threshold range.
A detection module 30, configured to determine whether the counter electromotive force exceeds a target threshold range k times in a FOC control period; k is a function taking the rotating speed of the electronic oil pump motor as an independent variable, and the value of k is a positive integer; if so, determining that the electronic oil pump motor has a locked-rotor fault.
The invention provides a locked-rotor fault detection system of an electronic oil pump motor, which is characterized in that a target threshold range corresponding to a target working condition is determined in a preset corresponding relation table, and then the locked-rotor fault of the electronic oil pump motor is detected based on the target threshold range, so that the locked-rotor fault detection system can adapt to different working conditions and different electronic oil pump bodies, the use range of a control system is improved, and the technical problem of inaccurate fault detection under complex working conditions in the prior art is solved.
Optionally, the detection module 30 is further configured to:
if the back electromotive force is judged to be in a FOC control period and does not exceed the target threshold range for k times, acquiring the actual rotation speed of the electronic oil pump motor, and determining the rotation speed difference between the actual rotation speed and the set rotation speed of the electronic oil pump motor;
judging whether the rotation speed difference is smaller than a preset rotation speed threshold value or not;
if yes, determining that the electronic oil pump motor has no locked rotor fault;
if not, determining that the electronic oil pump motor has a locked-rotor fault.
Optionally, the system provided by the embodiment of the present invention further includes: and (5) an optimization module. Specifically, fig. 6 is a schematic diagram of an optimization module according to an embodiment of the present invention, and as shown in fig. 6, the optimization module includes: a sampling unit 61, a calibration unit 62 and an optimization unit 63.
Specifically, the sampling unit 61 is configured to sample a back electromotive force curve of the electronic oil pump motor under different working conditions based on the sliding mode observer, so as to obtain an initial back electromotive force curve.
And the calibration unit 62 is configured to calibrate the initial threshold range based on the initial back electromotive force curve, and obtain an initial correspondence table.
And the optimizing unit 63 is configured to optimize the initial correspondence table based on the test calibration method, so as to obtain a preset correspondence table.
Specifically, the optimizing unit 63 is further configured to:
dividing test intervals of working conditions of the electronic oil pump at preset intervals to obtain a plurality of working condition test points; the working conditions of the electronic oil pump motor comprise: the load moment of inertia, input the direct current busbar voltage, the load torque;
starting the electronic oil pump motor to run in a fault-free state under the working condition corresponding to the first working condition test point; the first working condition test point is one test point of a plurality of working condition test points;
performing locked-rotor fault detection on the electronic oil pump motor based on an initial threshold range corresponding to the first working condition test point in the initial correspondence table;
if the occurrence of the locked rotor fault of the electronic oil pump motor is detected, the initial threshold range is lifted and updated by a preset percentage until the locked rotor fault is not detected;
if no locked-rotor fault of the electronic oil pump motor is detected, optimizing an initial threshold range corresponding to the next test point of the first working condition test point.
The embodiment of the invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the method in the first embodiment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The method for detecting the locked rotor fault of the electronic oil pump motor is characterized by comprising the following steps of:
acquiring a target working condition and counter electromotive force of an electronic oil pump motor during operation;
determining a target threshold range corresponding to the target working condition in a preset corresponding relation table; the preset corresponding relation table is a corresponding relation table between the working condition of the electronic oil pump motor and a counter electromotive force threshold range;
judging whether the counter electromotive force exceeds the target threshold range k times in one FOC control period; k is a function taking the rotating speed of the electronic oil pump motor as an independent variable, and the value of k is a positive integer;
if so, determining that the electronic oil pump motor has a locked rotor fault.
2. The method according to claim 1, wherein the method further comprises:
if the back electromotive force is judged to be in a FOC control period and does not exceed the target threshold range k times, acquiring the actual rotation speed of the electronic oil pump motor, and determining the rotation speed difference between the actual rotation speed and the set rotation speed of the electronic oil pump motor;
judging whether the rotation speed difference is smaller than a preset rotation speed threshold value or not;
if yes, determining that the electronic oil pump motor has no locked rotor fault;
if not, determining that the electronic oil pump motor has a locked rotor fault.
3. The method of claim 1, wherein obtaining the back emf of the electronic oil pump motor during operation comprises: and acquiring the back electromotive force through a sliding mode observer.
4. The method according to claim 1, wherein the method further comprises:
sampling a back electromotive force curve of the electronic oil pump motor under different working conditions based on a sliding mode observer to obtain an initial back electromotive force curve;
calibrating an initial threshold range based on the initial back electromotive force curve to obtain an initial corresponding relation table;
and optimizing the initial corresponding relation table based on a test calibration method to obtain the preset corresponding relation table.
5. The method of claim 4, wherein optimizing the initial correspondence table based on a test calibration method comprises:
dividing the test interval of the working condition of the electronic oil pump at preset intervals to obtain a plurality of working condition test points; the working conditions of the electronic oil pump motor comprise: the load moment of inertia, input the direct current busbar voltage, the load torque;
starting the electronic oil pump motor to run in a fault-free state under the working condition corresponding to the first working condition test point; the first working condition test point is one test point of the plurality of working condition test points;
performing locked-rotor fault detection on the electronic oil pump motor based on an initial threshold range corresponding to the first working condition test point in the initial correspondence table;
if the occurrence of the locked rotor fault of the electronic oil pump motor is detected, the initial threshold range is lifted and updated by a preset percentage until the locked rotor fault is not detected;
if the locked rotor fault of the electronic oil pump motor is not detected, optimizing an initial threshold range corresponding to the next test point of the first working condition test point.
6. A locked rotor fault detection system for an electronic oil pump motor, comprising: the device comprises an acquisition module, a determination module and a detection module; wherein,,
the acquisition module is used for acquiring a target working condition and counter electromotive force of the electronic oil pump motor during operation;
the determining module is used for determining a target threshold range corresponding to the target working condition in a preset corresponding relation table; the preset corresponding relation table is a corresponding relation table between the working condition of the electronic oil pump motor and a counter electromotive force threshold range;
the detection module is used for judging whether the counter electromotive force exceeds the target threshold range k times in a FOC control period; k is a function taking the rotating speed of the electronic oil pump motor as an independent variable, and the value of k is a positive integer; if so, determining that the electronic oil pump motor has a locked rotor fault.
7. The system of claim 6, wherein the detection module is further configured to:
if the back electromotive force is judged to be in a FOC control period and does not exceed the target threshold range k times, acquiring the actual rotation speed of the electronic oil pump motor, and determining the rotation speed difference between the actual rotation speed and the set rotation speed of the electronic oil pump motor;
judging whether the rotation speed difference is smaller than a preset rotation speed threshold value or not;
if yes, determining that the electronic oil pump motor has no locked rotor fault;
if not, determining that the electronic oil pump motor has a locked rotor fault.
8. The system of claim 6, wherein the system further comprises: an optimization module; the optimization module comprises: the device comprises a sampling unit, a calibration unit and an optimization unit; wherein,,
the sampling unit is used for sampling the back electromotive force curve of the electronic oil pump motor under different working conditions based on a sliding mode observer to obtain an initial back electromotive force curve;
the calibration unit is used for calibrating an initial threshold range based on the initial back electromotive force curve to obtain an initial corresponding relation table;
the optimizing unit is used for optimizing the initial corresponding relation table based on a test calibration method to obtain the preset corresponding relation table.
9. The system of claim 8, wherein the optimization unit is further configured to:
dividing the test interval of the working condition of the electronic oil pump at preset intervals to obtain a plurality of working condition test points; the working conditions of the electronic oil pump motor comprise: the load moment of inertia, input the direct current busbar voltage, the load torque;
starting the electronic oil pump motor to run in a fault-free state under the working condition corresponding to the first working condition test point; the first working condition test point is one test point of the plurality of working condition test points;
performing locked-rotor fault detection on the electronic oil pump motor based on an initial threshold range corresponding to the first working condition test point in the initial correspondence table;
if the occurrence of the locked rotor fault of the electronic oil pump motor is detected, the initial threshold range is lifted and updated by a preset percentage until the locked rotor fault is not detected;
if the locked rotor fault of the electronic oil pump motor is not detected, optimizing an initial threshold range corresponding to the next test point of the first working condition test point.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method of any of the preceding claims 1 to 5 when the computer program is executed.
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| CN202210139798.2A CN114337380B (en) | 2022-02-16 | 2022-02-16 | Method and system for detecting locked rotor fault of electronic oil pump motor |
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| CN202210139798.2A CN114337380B (en) | 2022-02-16 | 2022-02-16 | Method and system for detecting locked rotor fault of electronic oil pump motor |
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