WO2020177575A1 - Procédé et appareil de détection d'une valeur de résistance d'isolation, et dispositif électronique et support de stockage - Google Patents

Procédé et appareil de détection d'une valeur de résistance d'isolation, et dispositif électronique et support de stockage Download PDF

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WO2020177575A1
WO2020177575A1 PCT/CN2020/076577 CN2020076577W WO2020177575A1 WO 2020177575 A1 WO2020177575 A1 WO 2020177575A1 CN 2020076577 W CN2020076577 W CN 2020076577W WO 2020177575 A1 WO2020177575 A1 WO 2020177575A1
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Prior art keywords
insulation resistance
signal
module
resistance value
insulation
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PCT/CN2020/076577
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English (en)
Chinese (zh)
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孙卫平
但志敏
张伟
侯贻真
李盟
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宁德时代新能源科技股份有限公司
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Publication of WO2020177575A1 publication Critical patent/WO2020177575A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters

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  • the embodiments of the present application relate to the field of integrated circuits, and in particular, to a method, device, electronic device, and storage medium for detecting insulation resistance.
  • the battery pack is one of the key components of electric vehicles, and its high-voltage safety must be one of the primary considerations of the battery system. Therefore, the detection of the insulation performance of electric vehicles is an essential part of the design.
  • Most of the existing insulation detection modules use the national standard method for insulation resistance detection.
  • the principle of the national standard method to detect the insulation resistance is to calculate the insulation resistance by detecting the voltage of the high-voltage positive and high-voltage negative terminals to the reference potential terminal, and bringing the detected voltage value into the formula.
  • the insulation resistance of the entire vehicle system can be detected only after the entire vehicle is applied to high voltage. Before the high voltage is applied to the whole vehicle, the insulation resistance of the whole vehicle system cannot be detected.
  • the purpose of the embodiments of the present application is to provide an insulation resistance detection method, device, electronic equipment, and storage medium, so that the insulation resistance detection of the entire vehicle system can be completed before the high voltage is applied.
  • the embodiments of the present application provide an insulation resistance detection method, which is applied to an insulation detection circuit.
  • the insulation detection circuit includes an isolation module, a voltage divider module, and a signal generation module.
  • the positive pole of the battery pack is connected, and the other end of the isolation module is connected to the signal generation module through the voltage divider module;
  • the insulation resistance detection method includes: before the high voltage is applied to the whole vehicle, the control signal generation module generates a signal; closes the main vehicle Any one of the switch modules; samples the first end of the voltage divider module to obtain the first signal; sample the second end of the voltage divider module to obtain the second signal; according to the first signal and the second signal, Determine the first insulation resistance value, the first insulation resistance value is the parallel value of the second insulation resistance value and the third insulation resistance value, where the second insulation resistance value is the insulation of the high voltage line inside the main switch module of the vehicle to the reference potential terminal The third insulation resistance value is the insulation resistance value of the high voltage line outside the main switch module of the vehicle to the reference potential terminal.
  • the embodiment of the present application also provides an insulation resistance detection device, which is applied to an insulation detection circuit.
  • the insulation detection circuit includes an isolation module, a voltage divider module, and a signal generation module. One end of the isolation module is connected to the positive pole of the battery pack of the vehicle.
  • the insulation resistance detection device includes: a first control module, a second control module, a first sampling module, a second sampling module, and a first determining module;
  • the first control module is used to control the signal generation module to generate a signal before applying high voltage to the vehicle;
  • the second control module is used to close any one of the main switch modules of the vehicle;
  • the first sampling module is used in the second After the control module closes any one of the main switch modules of the vehicle, it samples the first end of the voltage divider module to obtain the first signal;
  • the second sampling module is used to close the main switch of the vehicle in the second control module After any switch module in the module, the second end of the voltage divider module is sampled to obtain the second signal;
  • the first determination module is used to determine the first insulation resistance value and the first insulation resistance value according to the first signal and the second signal.
  • the resistance value is the parallel value of the second insulation resistance value and the third insulation resistance value, where the second insulation resistance value is the insulation resistance value of the high voltage line inside the main switch module of the vehicle to the reference potential end, and the third insulation resistance value is the integer The insulation resistance value of the high voltage line outside the main switch module of the vehicle to the reference potential terminal.
  • An embodiment of the present application provides an electronic device, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by at least one processor, and the instructions are The processor executes, so that at least one processor can execute the insulation resistance detection method mentioned in the foregoing embodiment.
  • the embodiment of the present application provides a computer-readable storage medium that stores a computer program, and when the computer program is executed by a processor, the insulation resistance detection method mentioned in the above-mentioned embodiment is implemented.
  • the signals at both ends of the voltage divider module are sampled, and the inside of the main switch module is determined according to the sampled signal.
  • the parallel value of the insulation resistance of the high voltage line to the reference potential end and the insulation resistance of the high voltage line outside the main switch module to the reference potential end makes it possible to complete the detection of the parallel value of the insulation resistance of the main switch module before applying the high voltage.
  • the insulation resistance test is completed before the high voltage is applied, which improves the safety performance of the vehicle.
  • the insulation resistance detection method further includes: determining a second insulation resistance; after determining the first insulation resistance according to the first signal and the second signal, The insulation resistance detection method further includes: determining the third insulation according to the first insulation resistance, the second insulation resistance, and the constraint relationship among the first insulation resistance, the second insulation resistance, and the third insulation resistance. Resistance.
  • the detection of the insulation resistance value of the reference potential end of the high voltage line outside the main switch module is completed before the high voltage is applied to the whole vehicle, which further improves the safety performance of the whole vehicle.
  • the insulation resistance value After determining the third insulation resistance value according to the first insulation resistance value, the second insulation resistance value, and the constraint relationship among the first insulation resistance value, the second insulation resistance value and the third insulation resistance value, the insulation resistance value The detection method also includes: judging whether the third insulation resistance value is abnormal; if it is determined that the third insulation resistance value is abnormal, perform the following operations for each electrical equipment of the entire vehicle: control the switch of the electrical equipment to close; determine the electrical equipment The third insulation resistance value after the switch is closed is judged whether the third insulation resistance value after the switch of the electrical equipment is closed is abnormal; if it is determined that it is, it is determined that the branch where the electrical equipment is located is faulty. In this implementation, the fault point where the insulation fault occurs can be found, and the intelligence of the insulation resistance detection device is improved.
  • the detection method of the insulation resistance value further includes: if it is determined that the third insulation resistance value is abnormal, reporting an insulation fault outside the main switch module.
  • the insulation fault can be reported in time, avoiding the high voltage on the entire vehicle in the case of insulation fault.
  • Determining the second insulation resistance value specifically includes: determining that the main switch module of the vehicle is in the off state; sampling the first end of the voltage divider module to obtain the third signal; sampling the second end of the voltage divider module to obtain The fourth signal; according to the third signal and the fourth signal, determine the second insulation resistance.
  • the insulation resistance detection method further includes: if the second insulation resistance value is determined to be abnormal, reporting an insulation fault inside the main switch module.
  • the insulation resistance detection method further includes: determining that the second insulation resistance is normal.
  • the insulation resistance detection method also includes: applying low voltage to the vehicle.
  • the signal generated by the signal generation module is a sine wave AC signal; according to the third signal and the fourth signal, the second insulation resistance value is determined, which specifically includes: according to the third signal and the fourth signal, determine the sine wave AC at the second end of the voltage divider module The first phase shift of the signal relative to the sine wave AC signal at the first end of the voltage divider module; according to formula a, calculate the second insulation resistance; where formula a is: In formula a, Rnp1 represents the second insulation resistance value, U 1 represents the amplitude of the third signal, ⁇ 1 represents the first phase shift, u 1 represents the amplitude of the fourth signal, R 1 represents the resistance value of the voltage divider module, and w represents The angular frequency of the sine wave AC signal, C 1 represents the capacitance value of the isolation module.
  • the signal generated by the signal generating module is a sine wave AC signal; according to the first signal and the second signal, determining the first insulation resistance value includes: determining the sine wave AC at the second end of the voltage divider module according to the first signal and the second signal The second phase shift of the signal relative to the sine wave AC signal at the first end of the voltage divider module; according to formula b, calculate the second insulation resistance; where formula b is: In formula b, Rnp represents the first insulation resistance value, U_2 represents the amplitude of the first signal, ⁇ _2 represents the second phase shift, u_2 represents the amplitude of the second signal, R_1 represents the resistance value of the voltage divider module, and w represents the sine wave AC signal The corner frequency, C_1 represents the capacitance value of the isolation module.
  • Rnp2 represents the third insulation resistance value
  • Rnp represents the first insulation resistance value
  • Rnp1 represents the second insulation resistance value
  • FIG. 1 is a flowchart of a method for detecting insulation resistance according to a first embodiment of the present application
  • FIG. 2 is a schematic diagram of the structure of the circuit of the entire vehicle according to the first embodiment of the present application;
  • FIG. 3 is a schematic structural diagram of an equivalent circuit of the circuit of the entire vehicle in FIG. 2;
  • FIG. 4 is a schematic structural diagram of an equivalent circuit in which any one of the main switch modules in the main switch module in FIG. 3 is in a closed state;
  • FIG. 5 is a flowchart of a method for detecting insulation resistance according to a second embodiment of the present application.
  • Fig. 6 is a schematic structural diagram of an equivalent circuit when the main switch modules in Fig. 3 are all in an off state;
  • FIG. 7 is a flowchart of a method for detecting insulation resistance according to a third embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of an insulation resistance detection device according to a fourth embodiment of the present application.
  • FIG. 9 is a schematic diagram of the structure of the insulation resistance detection device of the fifth embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of an electronic device according to a sixth embodiment of the present application.
  • the first embodiment of the present application relates to a method for detecting insulation resistance, which is applied to an insulation detection circuit.
  • the insulation detection circuit includes an isolation module, a voltage divider module, and a signal generation module. One end of the isolation module is connected to the positive pole of the battery pack of the vehicle. Connection, the other end of the isolation module is connected to the signal generation module through the voltage divider module.
  • the flow chart of the insulation resistance detection method is shown in Figure 1.
  • the insulation resistance detection device performs the following steps before applying high voltage to the vehicle:
  • Step 101 Control the signal generating module to generate a signal.
  • the signal generating module may be a signal generator using Direct Digital Synthesis (DDS) technology.
  • DDS Direct Digital Synthesis
  • the DDS signal generator In the process of insulation resistance detection by the AC injection method, the DDS signal generator generates a low-frequency AC signal.
  • the parallel value of the insulation resistance of the high-voltage line inside the main switch to the reference potential end and the insulation resistance of the high-voltage line outside the main switch module to the reference potential end can be determined.
  • reference potential terminal may be the body of the entire vehicle, but is not limited to the body of the entire vehicle.
  • Step 102 Close any one of the main switch modules of the vehicle.
  • the main switch module of the vehicle includes a main positive switch module, a main negative switch module and a pre-charge switch module.
  • the isolation module of the insulation detection circuit is a capacitor
  • the voltage divider module is a resistor
  • the signal generation module is a DSS signal generator.
  • the insulation resistance detection device samples the voltage at the first end of the voltage divider module through the first sampling module, and samples the voltage at the second end of the voltage divider module through the second sampling module.
  • the first sampling module passes through the first isolation unit. Connected to the first end of the voltage dividing module, and the second sampling module is connected to the second end of the voltage dividing module through the second isolation unit.
  • Figure 2 the schematic diagram of the circuit of the whole vehicle is shown in Figure 2.
  • the circuit of the power supply loop includes: battery pack (V), main positive switch module (S1), main negative switch module (S2), precharge switch module (S3) and load module;
  • the load module includes vehicle motor, air conditioner, direct current converter (DCDC) and other electrical equipment.
  • R1 represents the voltage divider module
  • C1 represents the isolation module
  • DSS represents the signal generation module
  • D1 represents the first sampling module
  • D2 represents the second sampling module
  • G1 represents the first isolation unit
  • G2 represents the second isolation unit
  • An isolation unit is used to isolate the signal interference of the first sampling module to the first end of the voltage divider module
  • the second isolation unit is used to isolate the signal interference of the second sampling module to the second end of the voltage divider module.
  • Cp1 and Cn1 represent the Y capacitance of the battery pack
  • Rp1 and Rn1 represent the insulation resistance of the battery pack
  • Rpre represents the precharge resistance
  • S_0 to S_x are the switch modules of each electrical device
  • Cx0 to Cxx are the electrical device
  • the equivalent X capacitance of the high-voltage DC input front end, Rn20 to Rn2x and Rp20 to Rp2x are the equivalent insulation resistance values of the high-voltage DC input front end of each electrical equipment, Cn20 to Cn2x and Cp20 to Cp2x are the high voltage of each electrical equipment
  • Insulation detection circuit for the circuit shown in Figure 2, because the internal resistance of the battery pack is very small relative to the insulation resistance of the vehicle, it can be considered that the branch where the battery pack is located is in a short-circuit state, and the inside of the main switch module can be
  • Rnp1 represents the insulation resistance of the high-voltage line inside the main switch module to the reference potential end
  • Cnp1 represents the Y capacitance of the high-voltage line inside the main switch module to the reference potential end.
  • the resistance of the precharge resistor is very small relative to the insulation resistance of the vehicle, it can also be regarded as a short circuit.
  • Cx0 to Cxx are the X capacitors connected to the high-voltage positive and high-voltage negative of the vehicle, their capacitance is very large, and when the input is a low-frequency AC signal, it can be considered as a short circuit.
  • FIG 4 Analyzing Figure 3, it can be seen that after any one of the main switch modules of the closed vehicle is closed, the equivalent circuit diagram is shown in Figure 4.
  • Rnp represents the first insulation resistance. It can be seen from Figure 4 that when any one of the switch modules of S1, S2 and S3 is closed, the value of Rnp can be detected by the AC injection method, that is, the insulation resistance of the high voltage line inside the main switch module to the reference potential terminal can be realized Detection of the parallel value of the insulation resistance value of the high voltage line outside the main switch module to the reference potential terminal.
  • the main switch module is a relay, that is, the main positive switch module is the main positive relay, the main negative switch module is the main negative relay, and the precharge switch module is the precharge relay.
  • FIG. 2 is only an example.
  • the isolation module, the voltage divider module, the first isolation unit, and the second isolation unit can use other types of circuits with the same function.
  • the embodiment does not limit the specific circuits of the isolation module, the voltage dividing module, the first isolation unit, and the second isolation unit.
  • Step 103 Sampling the first terminal of the voltage dividing module to obtain a first signal; sampling the second terminal of the voltage dividing module to obtain a second signal.
  • Step 104 Determine a first insulation resistance value according to the first signal and the second signal.
  • the first insulation resistance value is the parallel value of the second insulation resistance value and the third insulation resistance value, where the second insulation resistance value is the insulation resistance value of the high voltage line inside the main switch module of the vehicle to the reference potential terminal,
  • the third insulation resistance value is the insulation resistance value of the high voltage line outside the main switch module of the vehicle to the reference potential terminal.
  • the signal generated by the signal generation module is a sine wave AC signal.
  • the insulation resistance detection device determines the first insulation resistance value by determining the sine wave AC signal at the second end of the voltage divider module relative to the sine wave AC signal at the first end of the voltage divider module according to the first signal and the second signal The second phase shift; according to formula b, calculate the first insulation resistance.
  • Rnp represents the first insulation resistance value
  • U 2 represents the amplitude of the first signal
  • ⁇ 2 represents the second phase shift
  • u 2 represents the amplitude of the second signal
  • R 1 represents the resistance value of the voltage divider module
  • w represents The angular frequency of the sine wave AC signal
  • C 1 represents the capacitance value of the isolation module.
  • the method for detecting insulation resistance performs a test on both ends of the voltage divider module before the high voltage is applied to the vehicle and any one of the main switch modules is in the closed state.
  • the signal is sampled.
  • the parallel value of the insulation resistance of the high-voltage line inside the main switch module to the reference potential terminal and the insulation resistance of the high-voltage line outside the main switch module to the reference potential terminal is determined, so that the alignment can be completed before the high voltage is applied.
  • Detection of the parallel value of the insulation resistance of the main switch module is completed before the high voltage is applied, which improves the safety performance of the vehicle.
  • the second embodiment of the present application relates to a method for detecting insulation resistance.
  • This embodiment is a further improvement of the first embodiment.
  • the specific improvement is: after the first insulation resistance is determined, the first insulation resistance Value and the second insulation resistance value to determine the third insulation resistance value.
  • steps 201 to 206 are included, where step 201, step 203 to step 205 are approximately the same as steps 101 to 104 in the first embodiment, respectively. I won't repeat it here. The differences are mainly introduced below:
  • Step 201 Control the signal generating module to generate a signal.
  • Step 202 Determine the second insulation resistance value.
  • the insulation resistance value detection device obtains the second insulation resistance value so as to further determine the third insulation resistance value.
  • the method for determining the second insulation resistance value is: the insulation resistance value detection device determines that the main switch module of the vehicle is in the off state; sampling the first end of the voltage divider module to obtain the third signal; The second end of the voltage divider module is sampled to obtain the fourth signal; the second insulation resistance value is determined according to the third signal and the fourth signal.
  • the signal generated by the signal generation module is a sine wave AC signal.
  • the process of the insulation resistance detection device is: the insulation resistance detection device determines the sine wave AC signal at the second end of the voltage divider module relative to the sine wave AC signal at the first end of the voltage divider module according to the third signal and the fourth signal The first phase shift; according to formula a, calculate the second insulation resistance.
  • Rnp1 represents the second insulation resistance value
  • U 1 represents the amplitude of the third signal
  • ⁇ 1 represents the first phase shift
  • u 1 represents the amplitude of the fourth signal
  • R 1 represents the resistance value of the voltage divider module
  • w represents The angular frequency of the sine wave AC signal
  • C 1 represents the capacitance value of the isolation module.
  • the signal at the first end of the voltage divider module that is, the sine wave voltage signal
  • U U 1 *sin(wt)+M
  • U 1 is The amplitude of the sine wave signal
  • w is the angular frequency of the sine wave
  • M is the bias voltage of the sine wave signal.
  • the signal at the second end of the voltage divider module is u.
  • the phasor method can be expressed as:
  • the insulation resistance value Rnp1 of the high-voltage line inside the main switch module to the reference potential terminal can be calculated as:
  • the second insulation resistance value can be determined by sampling the signals of the first end of the voltage dividing module and the second end of the voltage dividing module.
  • the insulation resistance detection device determines whether the second insulation resistance value is abnormal, and if it is determined to be the case, it reports the insulation fault inside the main switch module.
  • the method of reporting the insulation fault inside the main switch module can be directly alarmed by the insulation resistance detection device, or the insulation resistance detection device can transmit the information indicating the insulation failure of the high voltage line inside the main switch module to the reference potential end to The upper computer, the upper computer alarms.
  • the method for the insulation resistance detection device to determine whether the second insulation resistance value is abnormal may be: judging whether the second insulation resistance value is less than the first threshold value, and if it is determined that it is, it is determined that the second insulation resistance value is abnormal.
  • the first threshold is set by those skilled in the art as required.
  • Step 203 Close any one of the main switch modules of the vehicle.
  • Step 204 Sampling the first end of the voltage divider module to obtain the first signal; sample the second end of the voltage divider module to obtain the second signal.
  • Step 205 Determine a first insulation resistance value according to the first signal and the second signal.
  • Step 206 Determine a third insulation resistance value according to the first insulation resistance value, the second insulation resistance value, and the constraint relationship among the first insulation resistance value, the second insulation resistance value and the third insulation resistance value.
  • the constraint relationship between the first insulation resistance, the second insulation resistance and the third insulation resistance may be Among them, Rnp2 represents the third insulation resistance value, Rnp represents the first insulation resistance value, and Rnp1 represents the second insulation resistance value.
  • Rnp2 represents the third insulation resistance value
  • Rnp1 represents the second insulation resistance value.
  • the insulation resistance detection device determines whether the third insulation resistance value is abnormal; if it is determined that the third insulation resistance value is abnormal, perform a separate operation for the electrical equipment of each vehicle The following operations: control the closing of the switch of the electrical equipment; determine the third insulation resistance value after the switch of the electrical equipment is closed, and determine whether the third insulation resistance value of the electrical equipment is abnormal after the switch is closed; The branch where the device is located is faulty.
  • the electrical equipment of the vehicle includes: the vehicle motor, air conditioner and DCDC.
  • the insulation resistance detection device first closes the switch of the vehicle motor, and disconnects the switch of the air conditioner, DCDC and For other electrical equipment, determine the insulation resistance value of the high voltage line outside the main switch module to the reference potential terminal when connected to the vehicle motor, and determine whether the insulation resistance value of the high voltage line outside the main switch module to the reference potential terminal when connected to the vehicle motor is abnormal. If yes, make sure that the branch circuit where the whole vehicle motor is located has an insulation failure, otherwise, it means that the branch circuit where the whole vehicle motor is located is normal.
  • the insulation resistance detection device can directly report the insulation fault of a branch circuit where a certain electrical equipment is located, and stop other power users.
  • Equipment testing can also determine the insulation failure of a branch circuit where a certain electrical equipment is located, and then continue to detect other electrical equipment to avoid failure to report all fault points in the case of multiple insulation failures.
  • the insulation resistance detection device after determining that the third insulation resistance value is abnormal, the insulation resistance detection device reports an insulation fault outside the main switch module. Further, the insulation resistance detection device reports the branch where the electrical equipment that has failed.
  • the insulation resistance detection method provided by this embodiment determines the outer side of the main switching module according to the parallel value of the insulation resistance of the main switching module and the insulation resistance of the high-voltage line inside the main switching module to the reference potential end
  • the insulation resistance of the high-voltage line to the reference potential end realizes the detection of the insulation resistance of the high-voltage line outside the main switch module to the reference potential end.
  • the third embodiment of the present application relates to a method for detecting insulation resistance.
  • This embodiment is a further refinement of the second embodiment. It specifically explains that before detecting the first insulation resistance and the second insulation resistance, Some related steps were added separately.
  • steps 301 to 317 are included.
  • step 302, step 304, step 305, and step 306 are the same as those in the second embodiment regarding determining the second insulation resistance.
  • the process is roughly the same, and step 309, step 311, step 312, and step 313 are respectively roughly the same as step 101 to step 104 in the first embodiment, and will not be repeated here.
  • the differences are mainly introduced below:
  • Step 301 Power on the whole vehicle with low voltage.
  • Step 302 Control the signal generating module to generate a signal.
  • the insulation resistance detection device controls the signal generation module to generate a sine wave AC signal with a preset frequency.
  • Step 303 Determine whether the signal generating module generates a sine wave AC signal with a preset frequency.
  • step 304 is executed, otherwise, step 302 is returned.
  • Step 304 Determine that the main switch module of the entire vehicle is in an off state.
  • Step 305 Sampling the first terminal of the voltage dividing module to obtain a third signal; sampling the second terminal of the voltage dividing module to obtain a fourth signal.
  • Step 306 Determine a second insulation resistance value according to the third signal and the fourth signal.
  • Step 307 Determine whether the second insulation resistance value is abnormal.
  • step 308 is executed; otherwise, step 309 is executed.
  • Step 308 Report the insulation fault inside the main switch module. After that, the process ends.
  • the insulation fault inside the main switch module means that the insulation resistance of the high voltage line inside the main switch module to the reference potential terminal does not meet the requirements.
  • the method for the detection device of the insulation resistance value to determine the abnormal second insulation resistance value and the method for reporting the internal insulation fault of the main switch module are respectively the same as the method for determining the second insulation resistance abnormality and the method for reporting the internal insulation fault of the main switch module in the first embodiment The method is roughly the same, so I won’t repeat it here.
  • Step 309 Control the signal generating module to generate a signal.
  • Step 310 Determine whether the signal generating module generates a sine wave AC signal with a preset frequency.
  • step 311 is executed, otherwise, step 309 is returned.
  • Step 311 Close any one of the main switch modules of the vehicle.
  • Step 312 Sampling the first terminal of the voltage dividing module to obtain a first signal; sampling the second terminal of the voltage dividing module to obtain a second signal.
  • Step 313 Determine the first insulation resistance value according to the first signal and the second signal.
  • the first insulation resistance value is a parallel value of the second insulation resistance value and the third insulation resistance value.
  • Step 314 Determine the third insulation resistance value according to the second insulation resistance value, the first insulation resistance value, and the constraint relationship among the second insulation resistance value, the first insulation resistance value and the third insulation resistance value.
  • the method for determining the third insulation resistance by the insulation resistance detection device is substantially the same as the method for determining the third insulation resistance in the second embodiment, and will not be repeated here.
  • Step 315 Determine whether the third insulation resistance value is abnormal.
  • step 316 is executed; otherwise, step 317 is executed.
  • Step 316 Report the outer insulation fault of the main switch module. After that, the process ends.
  • the insulation fault on the outside of the main switch module means that the insulation resistance of the high voltage line outside the main switch module to the reference potential terminal does not meet the requirements.
  • the following operations are performed for each electrical equipment of the entire vehicle: control the switch of the electrical equipment to close; determine the switch of the electrical equipment After closing the third insulation resistance value, determine whether the third insulation resistance value after the switch of the electrical equipment is closed is abnormal; if it is determined that it is, determine that the branch where the electrical equipment is located is faulty, and report the determined fault point.
  • Step 317 Report that the insulation is normal.
  • the insulation resistance detection method mentioned in this embodiment can sample the signals at both ends of the voltage divider module before the high voltage is applied to the whole vehicle and the main switch module is disconnected.
  • the sampled signal determines the insulation resistance value of the high voltage line inside the main switch module to the reference potential end, so that the insulation resistance value of the high voltage line inside the main switch module to the reference potential end can be detected before the high voltage is applied.
  • the signals at both ends of the voltage divider module are sampled, and the reference potential of the high voltage line inside the main switch module is determined according to the sampled signal.
  • the parallel value of the insulation resistance value of the main switch module and the insulation resistance value of the reference potential end of the high voltage line outside the main switch module makes it possible to complete the detection of the parallel value of the insulation resistance value of the main switch module before the high voltage is applied.
  • the insulation resistance test is completed before the high voltage is applied, which improves the safety performance of the vehicle.
  • the fourth embodiment of the present application relates to an insulation resistance detection device, which is applied to an insulation detection circuit.
  • the insulation detection circuit includes an isolation module, a voltage divider module, and a signal generation module. One end of the isolation module is connected to the positive pole of the battery pack of the vehicle. Connection, the other end of the isolation module is connected to the signal generation module through the voltage divider module.
  • the insulation resistance detection device includes: a first control module 401, a second control module 402, a first sampling module 403, a second sampling module 404 and a first determination module 405.
  • the first control module 401 is used to control the signal generation module to generate a signal before applying high voltage to the entire vehicle.
  • the second control module 402 is used to close any one of the main switch modules of the vehicle;
  • the first sampling module 403 is used to sample the first end of the voltage divider module to obtain the first signal;
  • the second sampling module 404 uses To sample the second end of the voltage divider module to obtain the second signal;
  • the first determining module 405 is configured to determine the first insulation resistance value according to the first signal and the second signal, and the first insulation resistance value is the second insulation resistance
  • this embodiment is a system embodiment corresponding to the first embodiment, and this embodiment can be implemented in cooperation with the first embodiment.
  • the related technical details mentioned in the first embodiment are still valid in this embodiment, and in order to reduce repetition, they will not be repeated here.
  • the related technical details mentioned in this embodiment can also be applied to the first embodiment.
  • the fifth embodiment of the present application relates to an insulation resistance detection device.
  • This embodiment is a further improvement of the fourth embodiment.
  • the specific improvements are: a second determination module 406, a third determination module 407 and The fourth determining module 408.
  • the functions of the first control module 401, the second control module 402, and the first determination module 405 are substantially the same in the fourth embodiment, and will not be repeated here.
  • the following mainly introduces other modules Function.
  • the second determining module 406 is used to determine that the main switch module of the entire vehicle is in the off state; the first sampling module 403 is used to determine the voltage divider module after the second determining module 406 determines that the main switch module of the entire vehicle is off The first terminal performs sampling to obtain the third signal; the second sampling module 404 is used to sample the second terminal of the voltage divider module after the second determining module 406 determines that the main switch module of the vehicle is in the off state, to obtain the first Four signals; the third determining module 407 is used to determine the second insulation resistance value according to the third signal and the fourth signal, the second insulation resistance value is the insulation resistance value of the high voltage line inside the main switch module of the vehicle to the reference potential terminal; The four determination module is used to determine the third insulation resistance value according to the first insulation resistance value, the second insulation resistance value, and the constraint relationship among the first insulation resistance value, the second insulation resistance value and the third insulation resistance value.
  • this embodiment is a system embodiment corresponding to the second embodiment, and this embodiment can be implemented in cooperation with the second embodiment.
  • the related technical details mentioned in the second embodiment are still valid in this embodiment, and in order to reduce repetition, they will not be repeated here.
  • the related technical details mentioned in this embodiment can also be applied to the second embodiment.
  • modules involved in the fourth and fifth embodiments are logical modules.
  • a logical unit can be a physical unit or a part of a physical unit. It can also be implemented in a combination of multiple physical units.
  • the fourth and fifth embodiments do not introduce units that are not closely related to solving the technical problems proposed by the present application, but this does not indicate that the fourth and fifth embodiments There are no other units in the fifth embodiment.
  • the sixth embodiment of the present application relates to an electronic device. As shown in FIG. 10, it includes: at least one processor 501; and a memory 502 communicatively connected with the at least one processor 501; wherein the memory 502 stores at least An instruction executed by one processor 501 is executed by at least one processor 501, so that at least one processor 501 can execute the insulation resistance detection method mentioned in the foregoing embodiment.
  • the electronic device includes: one or more processors 501 and a memory 502.
  • One processor 501 is taken as an example in FIG. 10.
  • the processor 501 and the memory 502 may be connected by a bus or in other ways. In FIG. 10, the connection by a bus is taken as an example.
  • the memory 502 can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules.
  • the processor 501 executes various functional applications and data processing of the device by running non-volatile software programs, instructions, and modules stored in the memory 502, that is, realizing the foregoing insulation resistance detection method.
  • the memory 502 may include a storage program area and a storage data area.
  • the storage program area may store an operating system and an application program required by at least one function; the storage data area may store a list of options and the like.
  • the memory 502 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices.
  • the memory 502 may optionally include a memory remotely provided with respect to the processor 501, and these remote memories may be connected to external devices via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.
  • One or more modules are stored in the memory 502, and when executed by one or more processors 501, the insulation resistance detection method in any of the foregoing method embodiments is executed.
  • the seventh embodiment of the present application relates to a computer-readable storage medium storing a computer program.
  • the computer program is executed by the processor, the above method embodiment is realized.
  • the program is stored in a storage medium and includes several instructions to enable a device ( It may be a single-chip microcomputer, a chip, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program code .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

La présente invention concerne, dans certains modes de réalisation, le domaine des circuits intégrés, et concerne un procédé et un appareil de détection d'une valeur de résistance d'isolation, et un dispositif électronique et un support de stockage. Dans certains des modes de réalisation de la présente invention, le procédé de détection d'une valeur de résistance d'isolation comprend : avant l'application d'une haute tension à un véhicule entier, la commande d'un module de génération de signal pour générer un signal (101); la fermeture de tous les modules de commutation d'un module de commutation principal du véhicule entier (102); l'échantillonnage d'une première extrémité d'un module de division de tension pour obtenir un premier signal, et l'échantillonnage d'une seconde extrémité du module de division de tension pour obtenir un second signal (103); et la détermination d'une première valeur de résistance d'isolation en fonction du premier signal et du second signal (104). La détection de valeurs de résistance d'isolation d'un système de véhicule entier peut être réalisée avant qu'une haute tension ne soit appliquée au véhicule entier.
PCT/CN2020/076577 2019-03-01 2020-02-25 Procédé et appareil de détection d'une valeur de résistance d'isolation, et dispositif électronique et support de stockage WO2020177575A1 (fr)

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CN201910156356.7A CN110967558A (zh) 2019-03-01 2019-03-01 一种绝缘阻值的检测方法、装置、电子设备及存储介质

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