CN-121995108-A - Insulation impedance detection method, device and system, and model acquisition method and medium

Abstract

The application discloses an insulation impedance detection method, an insulation impedance detection device, an insulation impedance detection system, an insulation impedance model acquisition method and a medium. The method for acquiring the insulation impedance detection model comprises the steps of controlling a standard motor controller without conductive foreign matters to stably operate under a normal working condition, acquiring a voltage reference value of voltages at two ends of a resistor to be detected and a temperature rise reference value of the resistor to be detected of the standard motor controller under the normal working condition, controlling the standard motor controller to sequentially and stably operate under a plurality of abnormal working conditions, acquiring a calibration value of insulation impedance under each abnormal working condition, acquiring the voltage calibration value of voltages at two ends of the resistor to be detected and the temperature rise calibration value of the resistor to be detected of the standard motor controller under each abnormal working condition, fitting to obtain an insulation impedance relation curve, and obtaining the insulation impedance detection model according to the voltage reference value, the temperature rise reference value and the insulation impedance relation curve. According to the insulation resistance detection model acquisition method, the conductive foreign matter residue condition in the motor controller can be accurately detected.

Inventors

• LIN YAMIN
• YU FANGLIN

Assignees

• 合肥阳光电动力科技有限公司

Dates

Publication Date

20260508

Application Date

20241031

Claims (10)

1. 1. A method for acquiring an insulation resistance detection model, comprising: the method comprises the steps that a standard motor controller without conductive foreign matters is controlled to stably operate under a normal working condition, and a voltage reference value of voltages at two ends of a resistor to be tested of the standard motor controller and a temperature rise reference value of the resistor to be tested under the normal working condition are obtained; the standard motor controller is controlled to sequentially and stably run under a plurality of abnormal working conditions, wherein the plurality of abnormal working conditions respectively correspond to the addition of conductive foreign matters with different parameter values to the standard motor controller; Acquiring a calibration value of insulation resistance under each abnormal working condition; Acquiring voltage calibration values of voltages at two ends of a resistor to be tested of the standard motor controller under each abnormal working condition, and temperature rise calibration values of the resistor to be tested; Fitting according to the calibration values of the insulation impedance, the voltage calibration values and the temperature rise calibration values under a plurality of abnormal working conditions to obtain an insulation impedance relation curve; and obtaining the insulation impedance detection model according to the voltage reference value, the temperature rise reference value and the insulation impedance relation curve.
2. 2. The method for obtaining the insulation resistance detection model according to claim 1, wherein the standard motor controller for controlling the non-conductive foreign matter stably operates under the normal working condition, and obtaining the voltage reference value of the voltage at two ends of the resistor to be detected of the standard motor controller and the temperature rise reference value of the resistor to be detected under the normal working condition comprises: The standard motor controller is controlled to sequentially and stably run under a plurality of environmental conditions under the condition of no conductive foreign matters, wherein the environmental temperature and/or the environmental humidity are different between different environmental conditions; Under each environmental condition, detecting the voltage at two ends of a resistor to be detected of the standard motor controller as a voltage candidate value, and detecting the temperature rise of the resistor to be detected of the standard motor controller as a temperature rise candidate value; And taking the maximum value of the voltage candidate values corresponding to the environmental conditions as a voltage reference value, and taking the maximum value of the temperature rise candidate values corresponding to the environmental conditions as a temperature rise reference value.
3. 3. The insulation resistance detection model acquisition method according to claim 2, wherein the detecting the voltage across the resistor to be detected of the standard motor controller as the voltage candidate value and the detecting the temperature rise of the resistor to be detected of the standard motor controller as the temperature rise candidate value under each environmental condition includes: under each environmental condition, obtaining voltages at two ends of the resistor to be tested as voltage candidate values; and under each environmental condition, acquiring a temperature detection value of the resistor to be detected, and acquiring a temperature rise candidate value according to the temperature detection value and the corresponding environmental temperature.
4. 4. The insulation resistance detection model acquisition method according to claim 1, wherein the controlling the standard motor controller without conductive foreign matter to stably operate under normal conditions comprises: The standard motor controller controlling the non-conductive foreign matter stably operates at the peak current.
5. 5. The insulation resistance detection model acquisition method according to claim 1, wherein the plurality of abnormal conditions sequentially correspond to adding conductive foreign matters different in distance and same in volume of a relatively high-voltage loop to the standard motor controller.
6. 6. The insulation resistance detection model acquisition method according to claim 1, wherein the plurality of abnormal conditions sequentially correspond to adding conductive foreign matters different in volume and same in relative high-voltage loop distance to the standard motor controller.
7. 7. An insulation resistance detection method, characterized in that insulation resistance of a high-voltage circuit of a motor controller with respect to an outer case is detected based on an insulation resistance detection model obtained by the insulation resistance detection model obtaining method according to any one of claims 1 to 6, the high-voltage circuit connecting a load of the motor controller in series with a resistance to be detected, the insulation resistance detection method comprising: Acquiring a voltage detection value of voltages at two ends of a resistor to be detected of a motor controller to be detected in operation and a temperature rise detection value of the resistor to be detected of the motor controller to be detected; if the voltage detection value is smaller than or equal to the voltage reference value and the temperature rise detection value is smaller than or equal to the temperature rise reference value, the motor controller to be detected is in a normal working condition; If the voltage detection value is greater than the voltage reference value and/or the temperature rise detection value is greater than the temperature rise reference value, the motor controller to be detected is in an abnormal working condition; And if the motor controller to be tested is in an abnormal working condition, obtaining a detection value of insulation impedance corresponding to the motor controller to be tested according to the voltage detection value, the temperature rise detection value and the insulation impedance relation curve.
8. 8. An insulation resistance detection apparatus for detecting insulation resistance of a high-voltage circuit of a motor controller with respect to an outer case based on the insulation resistance detection model obtained by the insulation resistance detection model obtaining method according to any one of claims 1 to 6, the high-voltage circuit connecting a load of the motor controller in series with a resistance to be measured, the insulation resistance detection apparatus comprising: The detection module is used for acquiring voltage detection values of voltages at two ends of a resistor to be detected of the motor controller to be detected in operation and temperature rise detection values of the resistor to be detected of the motor controller to be detected; The abnormality judgment module is configured to enable the motor controller to be tested to be in a normal working condition if the voltage detection value is smaller than or equal to the voltage reference value and the temperature rise detection value is smaller than or equal to the temperature rise reference value; And the insulation impedance acquisition module is configured to obtain a detection value of insulation impedance corresponding to the motor controller to be detected according to the voltage detection value, the temperature rise detection value and the insulation impedance relation curve if the motor controller to be detected is in an abnormal working condition.
9. 9. An insulation resistance detection system for detecting insulation resistance of a high voltage loop of a motor controller to be tested with respect to an outer housing, the high voltage loop connecting a load of the motor controller to be tested in series with a resistor to be tested, the insulation resistance detection system comprising: the voltage detection module is connected to two ends of the resistor to be detected of the motor controller to be detected and is used for obtaining voltage detection values of voltages at two ends of the resistor to be detected of the motor controller to be detected; The temperature detection module is arranged at the resistance to be detected of the motor controller to be detected and is used for obtaining a temperature rise detection value of the resistance to be detected of the motor controller to be detected; The control device is electrically connected with the voltage detection module and the temperature detection module, and comprises a memory and at least one processor, wherein instructions are stored in the memory, and the at least one processor calls the instructions in the memory so that the control device executes the insulation impedance detection method according to claim 7.
10. 10. A computer readable storage medium having instructions stored thereon, which when executed by a processor, implement the insulation resistance detection method of claim 7.

Description

Insulation impedance detection method, device and system, and model acquisition method and medium Technical Field The present application relates to the field of insulation impedance detection, and in particular, to an insulation impedance detection method, an insulation impedance detection device, an insulation impedance detection system, an insulation impedance model acquisition method, and a medium. Background The motor controller is a component for converting a direct current signal into a three-phase alternating current signal in a vehicle, and has a high-voltage circuit inside. The motor controller may have conductive foreign matter remaining inside during the manufacturing process, including tin balls remaining during the device soldering process. During running of the vehicle, along with vibration of the whole vehicle, the conductive foreign matters can be connected with a high-voltage loop, so that an arc discharge phenomenon occurs, and the arc discharge phenomenon can cause damage to a motor controller. Therefore, detection of the residual condition of the conductive foreign matter needs to be performed for the motor controller. However, there is currently no effective detection means for the residual condition of the conductive foreign matter. Disclosure of Invention The application provides an insulation resistance detection method, an insulation resistance detection device, an insulation resistance detection system, an insulation resistance detection model acquisition method and an insulation resistance detection medium, which are convenient for detecting insulation resistance of a high-voltage loop of a motor controller relative to an outer shell, so that the insulation resistance detection method, the insulation resistance detection device, the insulation resistance detection system and the insulation resistance detection medium are convenient for accurately detecting the residual condition of conductive foreign matters in the motor controller. According to the method, a standard motor controller without conductive foreign matters is controlled to stably operate under a normal working condition, a voltage reference value of voltages at two ends of a resistor to be detected and a temperature rise reference value of the resistor to be detected of the standard motor controller under the normal working condition are obtained, the standard motor controller is controlled to sequentially and stably operate under a plurality of abnormal working conditions, the plurality of abnormal working conditions respectively correspond to the conductive foreign matters with different parameter values added to the standard motor controller, the calibration value of the insulation impedance under each abnormal working condition is obtained, the voltage calibration value of voltages at two ends of the resistor to be detected of the standard motor controller under each abnormal working condition and the temperature rise calibration value of the resistor to be detected are obtained, an insulation impedance relation curve is obtained according to the calibration value of the insulation impedance under the plurality of abnormal working conditions, the voltage calibration value and the temperature rise calibration value, and the insulation impedance relation curve is obtained according to the voltage reference value, the temperature rise reference value and the insulation impedance relation curve. According to the embodiment of the first aspect of the application, the standard motor controller for controlling the non-conductive foreign matters stably operates under the normal working condition, and the voltage reference value of the voltages at the two ends of the resistor to be tested of the standard motor controller and the temperature rise reference value of the resistor to be tested under the normal working condition are obtained, wherein the standard motor controller is controlled to sequentially and stably operate under a plurality of environmental conditions under the non-conductive foreign matters, the environmental temperature and/or the environmental humidity are different, the voltages at the two ends of the resistor to be tested of the standard motor controller are detected as voltage candidate values under each environmental condition, the temperature rise of the resistor to be tested of the standard motor controller is detected as temperature rise candidate values, the maximum value of the voltage candidate values corresponding to the environmental conditions is taken as the voltage reference value, and the maximum value of the temperature rise candidate values corresponding to the environmental conditions is taken as the temperature rise reference value. According to any one of the foregoing embodiments of the first aspect of the present application, detecting the voltage across the resistor to be measured of the standard motor controller as a voltage candidate value under each environmental condition, a