Insulation resistance detection method, device and system, model acquisition method and medium

Abstract

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

Description

Technical Field

[0001] This application relates to the field of insulation impedance testing, and in particular to an insulation impedance testing method, apparatus, system, model acquisition method, and medium. Background Technology

[0002] The motor controller is a component in a vehicle that converts DC signals into three-phase AC signals, and it contains a high-voltage circuit. During the manufacturing process, conductive foreign matter may remain inside the motor controller, including solder balls left over from the component soldering process. When the vehicle is in motion, the vibrations can cause these conductive foreign objects to connect to the high-voltage circuit, leading to arcing, which can damage the motor controller. Therefore, it is necessary to detect the presence of conductive foreign matter residue in the motor controller. However, currently, there is no effective method for detecting this residue. Summary of the Invention

[0003] This application provides an insulation impedance detection method, device, system, model acquisition method, and medium, which facilitates the detection of the insulation impedance of the high-voltage circuit of a motor controller relative to the housing, thereby facilitating the accurate detection of residual conductive foreign matter in the motor controller.

[0004] In a first aspect, embodiments of this application provide a method for obtaining an insulation impedance detection model. The method includes: controlling a standard motor controller without conductive foreign objects to operate stably under normal operating conditions, and obtaining a voltage reference value for the voltage across a resistor under test and a temperature rise reference value for the resistor under test under normal operating conditions; controlling the standard motor controller to operate stably under multiple abnormal operating conditions sequentially, wherein each abnormal operating condition corresponds to adding conductive foreign objects with different parameter values ​​to the standard motor controller; obtaining a calibration value of the insulation impedance under each abnormal operating condition; obtaining a voltage calibration value for the voltage across the resistor under test and a temperature rise calibration value for the resistor under test under each abnormal operating condition; fitting an insulation impedance relationship curve based on the calibration values ​​of the insulation impedance, the voltage calibration value, and the temperature rise calibration value under multiple abnormal operating conditions; and obtaining the insulation impedance detection model based on the voltage reference value, the temperature rise reference value, and the insulation impedance relationship curve.

[0005] According to the foregoing embodiments of the first aspect of this application, the method of controlling a standard motor controller free of conductive foreign objects to operate stably under normal operating conditions and obtaining a voltage reference value and a temperature rise reference value of the resistor under test under normal operating conditions includes: controlling the standard motor controller to operate stably under multiple environmental conditions in the absence of conductive foreign objects, wherein the ambient temperature and / or ambient humidity are different between the different environmental conditions; under each environmental condition, detecting the voltage across the resistor under test of the standard motor controller as a voltage candidate value, and detecting the temperature rise of the resistor under test of the standard motor controller as a temperature rise candidate value; and taking the maximum value among the multiple voltage candidate values ​​corresponding to the multiple environmental conditions as the voltage reference value, and taking the maximum value among the multiple temperature rise candidate values ​​corresponding to the multiple environmental conditions as the temperature rise reference value.

[0006] According to any of the foregoing embodiments of the first aspect of this application, the step of detecting the voltage across the resistor under test of the standard motor controller as a voltage candidate value and detecting the temperature rise of the resistor under test of the standard motor controller as a temperature rise candidate value under each environmental condition includes: obtaining the voltage across the resistor under test as a voltage candidate value under each environmental condition; obtaining the temperature detection value of the resistor under test under each environmental condition, and obtaining the temperature rise candidate value based on the temperature detection value and the corresponding environmental temperature.

[0007] According to any of the foregoing embodiments of the first aspect of this application, the stable operation of the standard motor controller without conductive foreign objects under normal working conditions includes: the stable operation of the standard motor controller without conductive foreign objects at peak current.

[0008] According to any of the foregoing embodiments of the first aspect of this application, multiple abnormal operating conditions sequentially correspond to the addition of conductive foreign objects of different relative high voltage circuit distances and the same volume to the standard motor controller.

[0009] According to any of the foregoing embodiments of the first aspect of this application, multiple abnormal operating conditions sequentially correspond to the addition of conductive foreign objects of different volumes and at the same distance from the high-voltage circuit to the standard motor controller.

[0010] Secondly, embodiments of this application provide an insulation impedance detection method, which detects the insulation impedance of a high-voltage circuit of a motor controller relative to its housing based on an insulation impedance detection model obtained according to the insulation impedance detection model acquisition method of any of the foregoing embodiments of the first aspect of this application. The high-voltage circuit connects the load of the motor controller in series with the resistor under test. The insulation impedance detection method includes: acquiring a voltage detection value of the voltage across the resistor under test of the motor controller under test and a temperature rise detection value of the resistor under test of the motor controller under test; if the voltage detection value is less than or equal to the voltage reference value and the temperature rise detection value is less than or equal to the temperature rise reference value, then the motor controller under test is in normal operating 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, then the motor controller under test is in abnormal operating condition; if the motor controller under test is in abnormal operating condition, the insulation impedance detection value corresponding to the motor controller under test is obtained according to the voltage detection value, the temperature rise detection value, and the insulation impedance relationship curve.

[0011] Thirdly, embodiments of this application provide an insulation impedance detection device, which is used to detect the insulation impedance of a high-voltage circuit of a motor controller relative to its housing based on an insulation impedance detection model obtained according to the insulation impedance detection model acquisition method of any of the foregoing embodiments of the first aspect of this application. The high-voltage circuit connects the load of the motor controller in series with the resistor under test. The insulation impedance detection device includes: a detection module, used to acquire the voltage detection value of the voltage across the resistor under test of the motor controller under test and the temperature rise detection value of the resistor under test of the motor controller under test; an anomaly judgment module, configured to: if the voltage detection value is less than or equal to the voltage reference value and the temperature rise detection value is less than or equal to the temperature rise reference value, then the motor controller under test is in normal operating 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, then the motor controller under test is in abnormal operating condition; and an insulation impedance acquisition module, configured to: if the motor controller under test is in abnormal operating condition, obtain the insulation impedance detection value corresponding to the motor controller under test based on the voltage detection value, the temperature rise detection value, and the insulation impedance relationship curve.

[0012] Fourthly, embodiments of this application provide an insulation impedance detection system for detecting the insulation impedance of a high-voltage circuit of a motor controller under test relative to its housing. The high-voltage circuit connects the load of the motor controller under test in series with a resistor under test. The insulation impedance detection system includes: a voltage detection module connected to the resistor under test of the motor controller under test, used to acquire a voltage detection value of the voltage across the resistor under test of the motor controller under test; a temperature detection module disposed at the resistor under test of the motor controller under test, used to acquire a temperature rise detection value of the resistor under test of the motor controller under test; and a control device electrically connected to the voltage detection module and the temperature detection module. The control device includes a memory and at least one processor. The memory stores instructions, and the at least one processor calls the instructions in the memory to cause the control device to execute the insulation impedance detection method according to any of the foregoing embodiments of the second aspect of this application.

[0013] Fifthly, embodiments of this application provide a computer-readable storage medium storing instructions that, when executed by a processor, implement an insulation impedance detection method according to any of the foregoing embodiments of the second aspect of this application.

[0014] According to the insulation impedance detection model acquisition method of this application embodiment, in this acquisition method, a standard motor controller without conductive foreign objects is stably operated under normal working conditions, and the voltage reference value of the voltage across the resistor under test and the temperature rise reference value of the resistor under test are acquired under normal working conditions. This acquisition method can also acquire an insulation impedance relationship curve, which reflects the relationship between insulation impedance, voltage across the resistor under test, and temperature rise of the resistor under test under abnormal working conditions. Based on the voltage reference value, temperature rise reference value, and insulation impedance relationship curve, an insulation impedance detection model can be obtained. This insulation impedance detection model can be used to accurately detect the insulation impedance of the high-voltage circuit of the motor controller under test relative to the casing, thereby accurately determining whether the motor controller under test is under normal working conditions and acquiring its insulation impedance when it is under abnormal working conditions. Therefore, it is easier to accurately grasp the residual conductive foreign objects in the motor controller under test, thereby timely evaluating the severity of the abnormality and facilitating timely implementation of corresponding protection measures for motor controllers prone to arcing, thus improving the reliability of the motor controller. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a flowchart of an embodiment of the insulation impedance detection model acquisition method of this application;

[0017] Figure 2 This is a schematic diagram of the circuit structure of a standard motor controller under normal operating conditions in one embodiment of the insulation impedance detection model acquisition method of this application.

[0018] Figure 3 This is a schematic diagram of the circuit structure of a standard motor controller under abnormal operating conditions in one embodiment of the insulation impedance detection model acquisition method of this application;

[0019] Figure 4 This is a schematic diagram of the circuit structure of a standard motor controller under abnormal operating conditions in an alternative embodiment of the insulation impedance detection model acquisition method of this application.

[0020] Figure 5 This is a flowchart of an embodiment of the insulation resistance detection method of this application;

[0021] Figure 6 This is a schematic diagram of the structure of an embodiment of the insulation resistance detection device of this application;

[0022] Figure 7 This is a schematic diagram of the structure of an embodiment of the insulation resistance detection system of this application;

[0023] Figure 8 This is a schematic diagram of the hardware structure of the control device in one embodiment of the insulation resistance detection system of this application.

[0024] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0028] This application provides a method for obtaining an insulation impedance detection model. The insulation impedance detection model is used to detect the insulation impedance of the high-voltage circuit of a motor controller relative to the housing, wherein the high-voltage circuit connects the load of the motor controller in series with the resistor to be measured.

[0029] Figure 1 This is a flowchart of an embodiment of the insulation impedance detection model acquisition method of this application. The method for acquiring the insulation impedance detection model includes steps S110 to S160.

[0030] In step S110, the standard motor controller, which is free of conductive foreign objects, is controlled to operate stably under normal operating conditions, and the voltage reference value of the voltage across the resistor under test and the temperature rise reference value of the resistor under test are obtained under normal operating conditions.

[0031] Conductive foreign objects can be metallic foreign objects, such as solder beads left over from the soldering process of a device.

[0032] Figure 2 This is a schematic diagram of the circuit structure of a standard motor controller under normal operating conditions in one embodiment of the insulation impedance detection model acquisition method of this application. The standard motor controller 100a includes a high-voltage circuit C1, a load RL, a resistor to be measured RN, a voltage detection module VT, and a temperature detection module TT.

[0033] The high-voltage circuit C1 is connected to the DC input terminal and contains a DC high-voltage signal. In this embodiment, the resistor to be measured RN is a parallel structure of multiple resistors. Figure 2The diagram uses RX to represent the insulation resistance of the high-voltage circuit C1 relative to the housing. Ideally, in a standard motor controller 100a without conductive foreign objects, this insulation resistance RX has a large value, for example, greater than 20 MΩ. In other motor controllers with conductive foreign objects, where the conductive foreign object connects the high-voltage circuit C1 to the housing ground, its insulation resistance decreases.

[0034] A voltage detection module VT is connected across the resistor RN under test in the standard motor controller 100a to obtain the voltage across RN. The voltage detection module VT is, for example, an isolated operational amplifier voltage detection module. A temperature detection module TT is located at the resistor RN under test in the standard motor controller 100a to obtain the temperature of RN, thereby obtaining the temperature rise relative to the ambient temperature.

[0035] In some embodiments, step S110, which controls a standard motor controller free of conductive foreign objects to operate stably under normal operating conditions and obtains a voltage reference value for the voltage across the resistor under test and a temperature rise reference value for the resistor under test under normal operating conditions, includes: controlling the standard motor controller to operate stably under multiple environmental conditions in the absence of conductive foreign objects, wherein the ambient temperature and / or ambient humidity are different between the different environmental conditions; under each environmental condition, detecting the voltage across the resistor under test of the standard motor controller as a voltage candidate value and detecting the temperature rise of the resistor under test of the standard motor controller as a temperature rise candidate value; taking the maximum value among the multiple voltage candidate values ​​corresponding to the multiple environmental conditions as the voltage reference value and the maximum value among the multiple temperature rise candidate values ​​corresponding to the multiple environmental conditions as the temperature rise reference value.

[0036] In some embodiments, the steps of detecting the voltage across the resistor under test of the standard motor controller as a voltage candidate value and detecting the temperature rise of the resistor under test of the standard motor controller as a temperature rise candidate value under each environmental condition include: acquiring the voltage across the resistor under test as a voltage candidate value under each environmental condition; acquiring the temperature detection value of the resistor under test under each environmental condition, and obtaining a temperature rise candidate value based on the temperature detection value and the corresponding ambient temperature. Specifically, in this embodiment, under each environmental condition, the voltage across the resistor under test is detected by a voltage detection module as a voltage candidate value; under each environmental condition, the temperature detection value of the resistor under test is detected by a temperature detection module at the resistor under test, and a temperature rise candidate value is obtained based on the temperature detection value and the corresponding ambient temperature.

[0037] In one example, multiple environmental conditions include a first environmental condition and a second environmental condition. The first environmental condition is an ambient temperature of 25℃ and an ambient humidity of 45% (normal temperature and humidity environment); the second environmental condition is an ambient temperature of 40℃ and an ambient humidity of 95% (high temperature and high humidity environment). Under the first environmental condition, the voltage across the resistor under test is detected by the voltage detection module as a candidate voltage value U1, and the temperature of the resistor under test is detected by the temperature detection module at the resistor under test as a temperature detection value T01. Based on the temperature detection value and the corresponding ambient temperature, the candidate temperature rise value ΔT01 = T01 - 25℃ is obtained. Under the second environmental condition, the voltage across the resistor under test is detected by the voltage detection module as a candidate voltage value U2, and the temperature of the resistor under test is detected by the temperature detection module at the resistor under test as a temperature detection value T02. Based on the temperature detection value and the corresponding ambient temperature, the candidate temperature rise value ΔT02 = T02 - 40℃ is obtained. The maximum value among multiple candidate voltage values ​​U1 and U2 corresponding to multiple environmental conditions is taken as the voltage reference value U0, and the maximum value among multiple candidate temperature rise values ​​ΔT01 and ΔT02 corresponding to multiple environmental conditions is taken as the temperature rise reference value ΔT0.

[0038] In the above example, the multiple environmental conditions include a first environmental condition and a second environmental condition. In other embodiments, the number of environmental conditions may be three, four, five, or other quantities. In some embodiments, the environmental temperature and humidity are different among the multiple different environmental conditions. In some embodiments, some of the multiple environmental conditions may have the same environmental temperature but different environmental humidity. For example, the multiple environmental conditions may include a third environmental condition, a fourth environmental condition, and a fifth environmental condition, where the third environmental condition is an environmental temperature of 25°C and an environmental humidity of 45%, the fourth environmental condition is an environmental temperature of 25°C and an environmental humidity of 65%, and the fifth environmental condition is an environmental temperature of 25°C and an environmental humidity of 85%. Alternatively, in some embodiments, some of the multiple environmental conditions may have the same environmental humidity but different environmental temperatures. For example, the multiple environmental conditions may include a sixth environmental condition, a seventh environmental condition, and an eighth environmental condition, where the sixth environmental condition is an environmental temperature of 25°C and an environmental humidity of 45%, the seventh environmental condition is an environmental temperature of 35°C and an environmental humidity of 45%, and the eighth environmental condition is an environmental temperature of 45°C and an environmental humidity of 45%.

[0039] In some embodiments, controlling a standard motor controller without conductive foreign objects to operate stably under normal operating conditions can mean controlling the standard motor controller without conductive foreign objects to operate stably at its rated operating current, maximum operating current, or peak operating current. In this embodiment, controlling a standard motor controller without conductive foreign objects to operate stably under normal operating conditions includes controlling the standard motor controller without conductive foreign objects to operate stably at its peak current.

[0040] In step S120, the standard motor controller is controlled to operate stably under multiple abnormal operating conditions in sequence. The multiple abnormal operating conditions correspond to the addition of conductive foreign objects with different parameter values ​​to the standard motor controller.

[0041] Figure 3 This is a schematic diagram of the circuit structure of a standard motor controller under abnormal operating conditions in one embodiment of the insulation impedance detection model acquisition method of this application. Figure 3 In this embodiment, multiple abnormal operating conditions correspond sequentially to the addition of conductive foreign objects of different distances from the high-voltage circuit but the same volume to the standard motor controller. In this embodiment, the conductive foreign objects added under multiple abnormal operating conditions have the same volume, but the distances of the conductive foreign objects relative to the high-voltage circuit under each abnormal operating condition are L1, L2, L3, and Ln, respectively.

[0042] In step S130, the calibration value of the insulation impedance under each abnormal operating condition is obtained. In this embodiment, the calibration value of the insulation impedance under each abnormal operating condition is obtained by a safety gauge.

[0043] In this embodiment, the calibrated values ​​of insulation impedance under multiple abnormal operating conditions obtained by the safety instrument are R1, R2, R3, and Rn, respectively.

[0044] In step S140, the voltage calibration value of the voltage across the resistor under test and the temperature rise calibration value of the resistor under test are obtained for each abnormal operating condition of the standard motor controller.

[0045] In this embodiment, the voltage calibration values ​​of the voltage across the resistor under test of the standard motor controller under multiple abnormal operating conditions are V1, V2, V3, and Vn, respectively, and the temperature rise calibration values ​​of the resistor under test of the standard motor controller under multiple abnormal operating conditions are ΔT1, ΔT2, ΔT3, and ΔTn, respectively.

[0046] In step S150, the insulation impedance relationship curve is obtained by fitting the calibrated values ​​of insulation impedance, voltage, and temperature rise under multiple abnormal operating conditions.

[0047] In this embodiment, insulation impedance relationship curves are obtained by fitting the insulation impedance calibration values ​​R1, R2, R3, Rn, voltage calibration values ​​V1, V2, V3, Vn, and temperature rise calibration values ​​ΔT1, ΔT2, ΔT3, ΔTn under multiple abnormal operating conditions. These curves can reflect the relationship between the distance of the conductive foreign object relative to the high-voltage circuit and the voltage and temperature rise (temperature change). The closer the distance, the greater the voltage value and the greater the temperature rise (temperature change).

[0048] In step S160, an insulation impedance detection model is obtained based on the voltage reference value, temperature rise reference value, and insulation impedance relationship curve. Then, the insulation impedance of the high-voltage circuit of the motor controller under test relative to the housing can be detected according to the obtained insulation impedance detection model.

[0049] In the above embodiments, multiple abnormal operating conditions sequentially correspond to the addition of conductive foreign objects of different distances from the high-voltage circuit but the same volume to the standard motor controller. In other embodiments, multiple abnormal operating conditions can be obtained by changing the parameter values ​​of other conductive foreign objects.

[0050] Figure 4 This is a schematic diagram of the circuit structure of a standard motor controller under abnormal operating conditions in an alternative embodiment of the insulation impedance detection model acquisition method of this application.

[0051] In this alternative embodiment, multiple abnormal operating conditions sequentially correspond to the addition of conductive foreign objects of different volumes but at the same distance from the high-voltage circuit to the standard motor controller. In this alternative embodiment, the conductive foreign objects added under multiple abnormal operating conditions are at the same distance from the high-voltage circuit, but the volumes of the conductive foreign objects under each abnormal operating condition are M1, M2, M3, and Mn, respectively.

[0052] In step S130 of the alternative embodiment, the calibration value of the insulation impedance under each abnormal operating condition is obtained by a safety gauge. In this alternative embodiment, the calibration values ​​of the insulation impedance under multiple abnormal operating conditions obtained by the safety gauge are R1_1, R2_1, R3_1, and Rn_1, respectively.

[0053] In step S140 of the alternative embodiment, the voltage calibration value of the voltage across the resistor under test of the standard motor controller and the temperature rise calibration value of the resistor under test are obtained under each abnormal operating condition. In this alternative embodiment, the voltage calibration values ​​of the voltage across the resistor under test of the standard motor controller under multiple abnormal operating conditions are V1_1, V2_1, V3_1, and Vn_1, respectively, and the temperature rise calibration values ​​of the resistor under test of the standard motor controller under multiple abnormal operating conditions are ΔT1_1, ΔT2_1, ΔT3_1, and ΔTn_1, respectively.

[0054] In step S150 of the alternative embodiment, an insulation impedance relationship curve is obtained by fitting the calibrated values ​​of insulation impedance, voltage, and temperature rise under multiple abnormal operating conditions. In this alternative embodiment, the insulation impedance relationship curve is obtained by fitting the calibrated values ​​of insulation impedance R1_1, R2_1, R3_1, Rn_1, voltage V1_1, V2_1, V3_1, Vn_1, and temperature rise ΔT1_1, ΔT2_1, ΔT3_1, ΔTn_1 under multiple abnormal operating conditions. This curve can reflect the relationship between the volume of the conductive foreign object and the voltage and temperature rise (temperature change). The larger the volume, the higher the voltage value, and the greater the temperature rise (temperature change).

[0055] According to the insulation impedance detection model acquisition method of this application embodiment, in this acquisition method, a standard motor controller without conductive foreign objects is stably operated under normal working conditions, and the voltage reference value of the voltage across the resistor under test and the temperature rise reference value of the resistor under test are acquired under normal working conditions. This acquisition method can also acquire an insulation impedance relationship curve, which reflects the relationship between insulation impedance, voltage across the resistor under test, and temperature rise of the resistor under test under abnormal working conditions. Based on the voltage reference value, temperature rise reference value, and insulation impedance relationship curve, an insulation impedance detection model can be obtained. This insulation impedance detection model can be used to accurately detect the insulation impedance of the high-voltage circuit of the motor controller under test relative to the casing, thereby accurately determining whether the motor controller under test is under normal working conditions and acquiring its insulation impedance when it is under abnormal working conditions. Therefore, it is easier to accurately grasp the residual conductive foreign objects in the motor controller under test, thereby timely evaluating the severity of the abnormality and facilitating timely implementation of corresponding protection measures for motor controllers prone to arcing, thus improving the reliability of the motor controller.

[0056] This application also provides an insulation impedance detection method, which detects the insulation impedance of the high-voltage circuit of the motor controller relative to the housing based on the insulation impedance detection model obtained by the insulation impedance detection model acquisition method of any of the foregoing embodiments. The high-voltage circuit connects the load of the motor controller in series with the resistor to be measured.

[0057] Figure 5 This is a flowchart of an embodiment of the insulation resistance testing method of this application. The insulation resistance testing method includes steps S210 to S240.

[0058] In step S210, the voltage detection value of the voltage across the resistor under test of the motor controller under test and the temperature rise detection value of the resistor under test of the motor controller under test are obtained.

[0059] In step S220, if the voltage detection value is less than or equal to the voltage reference value and the temperature rise detection value is less than or equal to the temperature rise reference value, then the motor controller under test is in normal operating condition.

[0060] In step S230, 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, then the motor controller under test is in an abnormal operating condition.

[0061] In step S240, if the motor controller under test is in an abnormal operating condition, the measured insulation impedance value of the motor controller under test is obtained based on the voltage detection value, temperature rise detection value, and insulation impedance relationship curve. In some embodiments, the measured insulation impedance value of the motor controller under test is calculated using a lookup table method based on the voltage detection value, temperature rise detection value, and insulation impedance relationship curve. Optionally, according to the user's requirements for the insulation impedance value, the abnormality severity level corresponding to the measured insulation impedance value is output.

[0062] The insulation impedance detection method according to the embodiments of this application can detect the insulation impedance of the high-voltage circuit of the motor controller relative to the housing based on the insulation impedance detection model. This facilitates accurate determination of whether the motor controller under test is in normal operating condition and to obtain its insulation impedance when it is in abnormal operating condition. This insulation impedance detection method can accurately determine the residual conductive foreign matter in the motor controller under test, thereby timely evaluating the severity of the abnormality and facilitating timely implementation of corresponding protection measures for motor controllers prone to arcing, thus improving the reliability of the motor controller.

[0063] This application also provides an insulation impedance detection device, which is used to detect the insulation impedance of the high-voltage circuit of a motor controller relative to the housing based on the insulation impedance detection model obtained by the insulation impedance detection model acquisition method of any of the foregoing embodiments. The high-voltage circuit connects the load of the motor controller in series with the resistor to be measured.

[0064] Figure 6 This is a schematic diagram of an embodiment of the insulation resistance detection device of this application. The insulation resistance detection device includes a detection module 610, an anomaly judgment module 620, and an insulation resistance acquisition module 630.

[0065] The detection module 610 is used to acquire the voltage detection value of the voltage across the resistor under test of the motor controller under test during operation, as well as the temperature rise detection value of the resistor under test of the motor controller under test.

[0066] The anomaly detection module 620 is configured such that: if the voltage detection value is less than or equal to the voltage reference value and the temperature rise detection value is less than or equal to the temperature rise reference value, the motor controller under test is in normal operating 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 under test is in abnormal operating condition.

[0067] The insulation impedance acquisition module 630 is configured to: if the motor controller under test is in an abnormal operating condition, obtain the detected value of the insulation impedance corresponding to the motor controller under test based on the voltage detection value, temperature rise detection value and insulation impedance relationship curve.

[0068] The insulation impedance detection method according to the embodiments of this application can detect the insulation impedance of the high-voltage circuit of the motor controller relative to the housing based on the insulation impedance detection model. This facilitates accurate determination of whether the motor controller under test is in normal operating condition and to obtain its insulation impedance when it is in abnormal operating condition. The insulation impedance detection device can accurately determine the residual conductive foreign matter in the motor controller under test, thereby timely evaluating the severity of the abnormality and facilitating timely implementation of corresponding protection measures for motor controllers prone to arcing, thus improving the reliability of the motor controller.

[0069] This application also provides an insulation resistance detection system. Figure 7 This is a schematic diagram of an embodiment of the insulation impedance detection system of this application. The insulation impedance detection system is used to detect the insulation impedance of the high-voltage circuit C1 of the motor controller under test relative to the housing. The high-voltage circuit C1 connects the load RL of the motor controller under test in series with the resistor RN to be tested.

[0070] The insulation impedance detection system includes a voltage detection module VT, a temperature detection module TT, and a control device 710. The voltage detection module VT is connected across the resistor RN of the motor controller under test (MTBD) to obtain the voltage detection value across the resistor RN. The temperature detection module TT is located at the resistor RN on the MTBD to obtain the temperature rise detection value. The control device 710 is electrically connected to the voltage detection module VT and the temperature detection module TT.

[0071] Figure 8 This is a schematic diagram of the hardware structure of the control device in one embodiment of the insulation impedance detection system of this application. The control device 710 includes a memory 711 and at least one processor 712. The memory 711 stores instructions, and the at least one processor 712 calls the instructions in the memory 711, causing the control device 710 to execute the insulation impedance detection method according to any of the foregoing embodiments of this application.

[0072] The insulation impedance detection method, based on the insulation impedance detection model obtained by the insulation impedance detection model acquisition method of any of the aforementioned embodiments, detects the insulation impedance of the high-voltage circuit of the motor controller relative to the housing. The high-voltage circuit connects the load of the motor controller in series with the resistor under test. The insulation impedance detection method includes: acquiring the voltage detection value of the voltage across the resistor under test of the motor controller under test during operation and the temperature rise detection value of the resistor under test of the motor controller under test; if the voltage detection value is less than or equal to the voltage reference value and the temperature rise detection value is less than or equal to the temperature rise reference value, then the motor controller under test is in normal operating 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, then the motor controller under test is in abnormal operating condition; if the motor controller under test is in abnormal operating condition, the insulation impedance detection value corresponding to the motor controller under test is obtained according to the voltage detection value, the temperature rise detection value, and the insulation impedance relationship curve.

[0073] Specifically, the processor 712 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0074] Memory 711 may include a large-capacity memory 711 for data or instructions. For example, and not limitingly, memory 711 may include a hard disk drive (HDD), a floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or a Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 711 may include removable or non-removable (or fixed) media. Where appropriate, memory 711 may be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, memory 711 is non-volatile solid-state memory. In a particular embodiment, memory 711 includes read-only memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these.

[0075] In one example, the control device may also include a communication interface 713 and a bus 714. The processor 712, memory 711, and communication interface 713 are connected via bus 714 and communicate with each other.

[0076] The communication interface 713 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0077] Bus 714 includes hardware, software, or both, that couples components of an online data traffic metering device together. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a Memory 711 bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 714 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, any suitable bus or interconnect is contemplated herein.

[0078] Furthermore, in conjunction with the insulation impedance detection methods in the above embodiments, this application embodiment can provide a computer-readable storage medium for implementation. This computer-readable storage medium stores instructions that, when executed by a processor, implement any of the insulation impedance detection methods in the above embodiments.

[0079] The insulation impedance detection method, based on the insulation impedance detection model obtained by the insulation impedance detection model acquisition method of any of the aforementioned embodiments, detects the insulation impedance of the high-voltage circuit of the motor controller relative to the housing. The high-voltage circuit connects the load of the motor controller in series with the resistor under test. The insulation impedance detection method includes: acquiring the voltage detection value of the voltage across the resistor under test of the motor controller under test during operation and the temperature rise detection value of the resistor under test of the motor controller under test; if the voltage detection value is less than or equal to the voltage reference value and the temperature rise detection value is less than or equal to the temperature rise reference value, then the motor controller under test is in normal operating 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, then the motor controller under test is in abnormal operating condition; if the motor controller under test is in abnormal operating condition, the insulation impedance detection value corresponding to the motor controller under test is obtained according to the voltage detection value, the temperature rise detection value, and the insulation impedance relationship curve.

[0080] This application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0081] The functional blocks shown in the above block diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0082] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0083] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A method for obtaining an insulation impedance detection model, characterized in that, include: The standard motor controller, which is free of conductive foreign objects, is stably operated under normal working conditions, and the voltage reference value of the voltage across the resistor under test and the temperature rise reference value of the resistor under test are obtained under normal working conditions. The standard motor controller is controlled to operate stably under multiple abnormal operating conditions in sequence, wherein the multiple abnormal operating conditions correspond to the addition of conductive foreign objects with different parameter values ​​to the standard motor controller; Obtain the calibration value of insulation resistance under each abnormal operating condition; Obtain the voltage calibration value of the voltage across the resistor under test of the standard motor controller and the temperature rise calibration value of the resistor under test under each abnormal operating condition; The insulation impedance relationship curve is obtained by fitting the calibrated values ​​of the insulation impedance, the voltage, and the temperature rise under multiple abnormal operating conditions. The insulation impedance detection model is obtained based on the voltage reference value, the temperature rise reference value, and the insulation impedance relationship curve.

2. The method for obtaining the insulation impedance detection model as described in claim 1, characterized in that, The standard motor controller, which controls the absence of conductive foreign objects, operates stably under normal operating conditions. The acquisition of the voltage reference value across the resistor under test and the temperature rise reference value of the resistor under test under normal operating conditions includes: The standard motor controller is controlled to operate stably under multiple environmental conditions in the absence of conductive foreign objects, wherein the environmental temperature and / or environmental humidity are different between the different environmental conditions; Under each environmental condition, the voltage across the resistor under test of the standard motor controller is detected as a candidate voltage value, and the temperature rise of the resistor under test of the standard motor controller is detected as a candidate temperature rise value. The maximum value among the multiple candidate voltage values ​​corresponding to multiple environmental conditions is used as the voltage reference value, and the maximum value among the multiple candidate temperature rise values ​​corresponding to multiple environmental conditions is used as the temperature rise reference value.

3. The method for obtaining the insulation impedance detection model as described in claim 2, characterized in that, The step of detecting the voltage across the resistor under test of the standard motor controller as a candidate voltage value and detecting the temperature rise of the resistor under test of the standard motor controller as a candidate temperature rise value under each environmental condition includes: Under each environmental condition, the voltage across the resistor under test is obtained as a candidate voltage value; Under each environmental condition, the temperature detection value of the resistor under test is obtained, and a candidate value for temperature rise is obtained based on the temperature detection value and the corresponding ambient temperature.

4. The method for obtaining the insulation impedance detection model as described in claim 1, characterized in that, The standard motor controller for controlling non-conductive foreign objects operates stably under normal working conditions, including: A standard motor controller that controls the absence of conductive foreign objects operates stably at peak current.

5. The method for obtaining the insulation impedance detection model as described in claim 1, characterized in that, Multiple abnormal operating conditions correspond sequentially to the addition of conductive foreign objects of the same volume but different relative high voltage circuit distances to the standard motor controller.

6. The method for obtaining the insulation impedance detection model as described in claim 1, characterized in that, Multiple abnormal operating conditions correspond sequentially to the addition of conductive foreign objects of different sizes but at the same distance from the high-voltage circuit to the standard motor controller.

7. A method for detecting insulation impedance, characterized in that, The insulation impedance detection model obtained by the insulation impedance detection model acquisition method according to any one of claims 1 to 6 is used to detect the insulation impedance of the high-voltage circuit of the motor controller relative to the housing, wherein the high-voltage circuit connects the load of the motor controller in series with the resistor to be measured, and the insulation impedance detection method includes: The voltage detection value of the voltage across the resistor under test of the motor controller under test and the temperature rise detection value of the resistor under test of the motor controller under test are obtained. If the voltage detection value is less than or equal to the voltage reference value and the temperature rise detection value is less than or equal to the temperature rise reference value, then the motor controller under test is in normal operating condition. If the detected voltage value is greater than the voltage reference value, and / or the detected temperature rise value is greater than the temperature rise reference value, then the motor controller under test is in an abnormal operating condition. If the motor controller under test is in an abnormal operating condition, the insulation impedance detection value corresponding to the motor controller under test is obtained based on the voltage detection value, the temperature rise detection value, and the insulation impedance relationship curve.

8. An insulation resistance detection device, characterized in that, An insulation impedance detection device is used to detect the insulation impedance of a high-voltage circuit of a motor controller relative to its housing, based on an insulation impedance detection model obtained by the insulation impedance detection model acquisition method as described in any one of claims 1 to 6, wherein the high-voltage circuit connects the load of the motor controller in series with the resistor to be measured, and the insulation impedance detection device comprises: The detection module is used to acquire the voltage detection value of the voltage across the resistor under test of the motor controller under test during operation, as well as the temperature rise detection value of the resistor under test of the motor controller under test. The anomaly detection module is configured to: if the voltage detection value is less than or equal to the voltage reference value and the temperature rise detection value is less than or equal to the temperature rise reference value, then the motor controller under test is in normal operating 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, then the motor controller under test is in abnormal operating condition. The insulation impedance acquisition module is configured to: if the motor controller under test is in an abnormal operating condition, obtain the detected value of the insulation impedance corresponding to the motor controller under test based on the voltage detection value, the temperature rise detection value, and the insulation impedance relationship curve.

9. An insulation resistance detection system, characterized in that, The insulation impedance detection system is used to detect the insulation impedance of the high-voltage circuit of the motor controller under test relative to the housing, wherein the high-voltage circuit connects the load of the motor controller under test in series with the resistor to be tested. The insulation impedance detection system includes: A voltage detection module is connected to both ends of the resistor under test in the motor controller under test, and is used to obtain the voltage detection value of the voltage across the resistor under test in the motor controller under test; A temperature detection module is installed at the resistor under test of the motor controller under test, and is used to obtain the temperature rise detection value of the resistor under test of the motor controller under test. A control device is electrically connected to the voltage detection module and the temperature detection module. The control device includes a memory and at least one processor. The memory stores instructions, and the at least one processor calls the instructions in the memory to cause the control device to execute the insulation impedance detection method as described in claim 7.

10. A computer-readable storage medium storing instructions thereon, characterized in that, When the instruction is executed by the processor, it implements the insulation impedance detection method as described in claim 7.

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