CN112014641B - Method and device for testing insulation resistance detection precision of whole electric automobile - Google Patents
Method and device for testing insulation resistance detection precision of whole electric automobile Download PDFInfo
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- CN112014641B CN112014641B CN201910452593.8A CN201910452593A CN112014641B CN 112014641 B CN112014641 B CN 112014641B CN 201910452593 A CN201910452593 A CN 201910452593A CN 112014641 B CN112014641 B CN 112014641B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention provides a method and a device for testing the detection precision of the insulation resistance of an electric vehicle, wherein the method comprises the steps of calculating the fault critical value of the insulation resistance of the electric vehicle according to the terminal voltage of the electric vehicle under the preset state of charge (SOC); according to the fault critical value, setting the upper limit value of the value range of the variable resistor under the SOC, and connecting the variable resistor in parallel between the positive electrode of the vehicle and the ground of the vehicle body; the resistance value of the variable resistor is adjusted according to a preset step length, a measured value of the insulation resistance of the whole vehicle and a read value of the insulation resistance of the whole vehicle reported by the ECU are obtained, and the measurement precision of different insulation resistances of the whole vehicle under the preset SOC is calculated; and acquiring and recording the measurement precision of the insulation resistance of different finished vehicles under a plurality of different SOCs. According to the scheme, when the insulation resistance of the whole vehicle is in a lower state, the detection precision of the insulation resistance of the whole vehicle in the full SOC range can be tested, the integrity of test data and test results is ensured, and finally the reporting accuracy of insulation faults is ensured.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a method and a device for testing the detection precision of the insulation resistance of an electric automobile.
Background
Insulation faults of electric automobiles can cause high-voltage electricity exposure, and personal injury is caused. The detection precision of the insulation resistance of the whole vehicle directly influences the detection and reporting of the insulation fault of the vehicle. In the prior art, a method for testing the detection precision of the insulation resistance of the whole vehicle is not available, and the accuracy of insulation fault detection and reporting is difficult to ensure.
Disclosure of Invention
The embodiment of the invention provides a method and a device for testing the detection precision of the insulation resistance of an electric automobile, which are used for solving the problems that the prior art lacks a method for testing the detection precision of the insulation resistance of the electric automobile and is difficult to ensure the detection and reporting accuracy of insulation faults.
In order to solve the technical problems, the embodiment of the invention provides the following technical scheme:
the embodiment of the invention provides a method for testing the detection precision of the insulation resistance of an electric automobile, which comprises the following steps:
according to the terminal voltage of the electric vehicle under the preset state of charge (SOC), calculating a fault critical value of the insulation resistance of the whole vehicle;
setting an upper limit value of a variable resistor in a value range under the SOC according to the fault critical value, and connecting the variable resistor in parallel between a positive electrode of a vehicle and a vehicle body ground;
the resistance value of the variable resistor is adjusted according to a preset step length, and under the condition of different resistance values of the variable resistor, a measured value of the whole vehicle insulation resistor and a read value of the whole vehicle insulation resistor reported by an ECU are obtained, and according to the measured value and the read value, the measurement precision of different whole vehicle insulation resistors under the preset SOC is calculated;
and acquiring and recording the measurement precision of the insulation resistance of different finished vehicles under a plurality of different SOCs.
Further, the step of calculating the fault critical value of the insulation resistance of the whole vehicle includes:
and measuring the terminal voltage of the electric vehicle, and multiplying the terminal voltage of the electric vehicle by a preset value to calculate the fault critical value of the insulation resistance of the whole vehicle.
Further, the step of obtaining the measured value of the insulation resistance of the whole vehicle includes:
according to a preset step length, the resistance value of the variable resistor is adjusted within the range from 0 to the upper limit value of the variable resistor;
and under different resistance values of the variable resistor, obtaining a measured value of the insulation resistance of the whole vehicle, which is obtained by an insulation resistance tester, wherein the insulation resistance tester is connected between the positive electrode of the vehicle and the ground of the vehicle body.
Further, the step of calculating to obtain the measurement accuracy of the insulation resistances of different vehicles under the preset SOC comprises the following steps:
and reading the read value of the insulation resistance of the whole vehicle reported by the ECU, and calculating the detection precision of the insulation resistance according to the read value and the measured value of the insulation resistance of the whole vehicle.
Further, the upper limit value of the variable resistor is obtained by adding a fault critical value of the whole vehicle insulation resistor and a preset resistance value.
One embodiment of the present invention further provides a device for testing insulation resistance detection precision of an electric vehicle, including:
the first calculation unit is used for calculating a fault critical value of the insulation resistance of the whole vehicle according to the terminal voltage of the electric vehicle under the preset state of charge (SOC);
a setting processing unit, configured to set an upper limit value of a value range of the variable resistor under the SOC according to the fault critical value, and connect the variable resistor in parallel between a positive pole of a vehicle and a vehicle body ground;
the measurement calculation unit is used for adjusting the resistance value of the variable resistor according to a preset step length, obtaining a measured value of the whole vehicle insulation resistor and a read value of the whole vehicle insulation resistor reported by the ECU under the condition of different resistance values of the variable resistor, and calculating the measurement precision of different whole vehicle insulation resistors under the preset SOC according to the measured value and the read value;
and the recording unit is used for acquiring and recording the measurement precision of the insulation resistances of different whole vehicles under a plurality of different SOCs.
Further, the first calculating unit is further configured to measure the terminal voltage of the electric vehicle, and calculate by multiplying the terminal voltage of the electric vehicle by a preset value to obtain a fault critical value of the insulation resistance of the whole vehicle.
Further, the measurement calculation unit is further configured to adjust a resistance value of the variable resistor in a range from 0 to an upper limit value of the variable resistor according to a preset step size;
and under different resistance values of the variable resistor, obtaining a measured value of the insulation resistance of the whole vehicle, which is obtained by an insulation resistance tester, wherein the insulation resistance tester is connected between the positive electrode of the vehicle and the ground of the vehicle body.
Further, the measurement calculation unit is further configured to read the read value of the insulation resistance of the whole vehicle reported by the ECU, and calculate, according to the read value and the measured value of the insulation resistance of the whole vehicle, the detection accuracy of the insulation resistance.
Further, the setting processing unit is further configured to calculate an upper limit value of the variable resistor, where the upper limit value of the variable resistor is calculated by adding a fault critical value of the insulation resistor of the whole vehicle to a preset resistance value.
The beneficial effects of the invention are as follows:
according to the scheme, when the insulation resistance of the whole vehicle is in a lower state, the insulation resistance detection precision in the full SOC range is tested, the integrity of test data and test results is guaranteed, and finally the accuracy of the insulation fault reporting is guaranteed.
Drawings
Fig. 1 is a schematic diagram of a method for testing the detection accuracy of the insulation resistance of an electric vehicle according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a device for testing the detection accuracy of the insulation resistance of the whole electric automobile according to an embodiment of the present invention.
Reference numerals illustrate:
21-a first calculation unit; 22-setting a processing unit; 23-a measurement calculation unit; 24-recording unit.
Detailed Description
The present invention will be described in detail below with reference to the drawings and the specific embodiments thereof in order to make the objects, technical solutions and advantages of the present invention more apparent.
Aiming at the problems that in the prior art, a method for testing the detection precision of the insulation resistance of the whole vehicle is lacking and the accuracy of insulation fault detection and reporting is difficult to ensure, the invention provides a method and a device for testing the detection precision of the insulation resistance of the whole vehicle of an electric automobile.
As shown in fig. 1, an embodiment of the present invention provides a method for testing insulation resistance detection accuracy of an electric vehicle, including:
and step 11, measuring terminal voltage of the electric vehicle under a certain preset state of charge (SOC), and calculating a fault critical value of the insulation resistance of the whole vehicle according to the terminal voltage.
Optionally, the fault critical value of the insulation resistance of the whole vehicle is obtained by multiplying the terminal voltage of the electric vehicle by a preset value.
Specifically, the fault critical value of the insulation resistance of the whole vehicle is calculated according to a first formula; wherein, the first formula is: r0=t0×v0.
Wherein R0 represents a fault critical value of the insulation resistance of the whole vehicle, V0 represents terminal voltage of the electric vehicle, the unit is volt, T0 is a preset value, and the unit is ohm/volt.
It should be noted that the value of T0 may be set according to an empirical value or according to actual measurement results of different vehicle types, for example, T0 may be 500 Ω/V.
And step 12, setting the upper limit value of the variable resistor in the SOC lower value range according to the fault critical value, and connecting the variable resistor in parallel between the positive electrode of the vehicle and the ground of the vehicle body.
Optionally, the upper limit value of the variable resistor is obtained by adding a fault critical value of the insulation resistor of the whole vehicle and a preset resistance value.
Specifically, the upper limit value of the variable resistor is calculated according to a third formula; wherein, the third formula is: upper limit value of variable resistance=r0+r1.
Wherein R0 represents a fault critical value of the insulation resistance of the whole vehicle, and R1 represents a preset resistance value.
It should be noted that the value of R1 may be set according to an empirical value or according to an actual measurement result of different vehicle types, for example, R1 may be 500kΩ.
And step 13, adjusting the resistance value of the variable resistor according to a preset step length, and under the condition of different resistance values of the variable resistor, obtaining a measured value of the whole vehicle insulation resistor and a read value of the whole vehicle insulation resistor reported by the ECU, and calculating to obtain the measurement precision of different whole vehicle insulation resistors under the preset SOC according to the measured value and the read value.
Alternatively, the resistance value of the variable resistor may be adjusted within a range from 0 to the upper limit value of the variable resistor, for example, the preset step size may be set to 500 Ω, and the resistance values of the variable resistor are sequentially set to 0 Ω, 500 Ω, 1000 Ω, 1500 Ω … … from 0 until one resistance value closest to but not exceeding the upper limit value of the variable resistor.
And under each resistance value of the set variable resistor, measuring and obtaining the measured value of the whole vehicle insulation resistor by using an insulation resistance tester, reading the read value of the whole vehicle insulation resistor reported by the ECU, and calculating and obtaining the measurement precision of different whole vehicle insulation resistors under the preset SOC according to the measured value and the read value.
It should be noted that, the ECU is a controller for detecting insulation inside the electric vehicle, and may monitor and report the insulation resistance value of the whole vehicle.
Optionally, the step of calculating to obtain the measurement accuracy of the insulation resistances of different vehicles under the preset SOC includes:
and reading the read value of the insulation resistance of the whole vehicle reported by the ECU, and calculating the detection precision of the insulation resistance according to the read value and the measured value of the insulation resistance of the whole vehicle.
Specifically, the detection precision of the insulation resistance is calculated according to a second formula; wherein the second formula is: the detection accuracy of the insulation resistance= (1-R/Rt) ×100%.
R represents a read value of the insulation resistance of the whole vehicle reported by the ECU, and Rt represents a measured value of the insulation resistance of the whole vehicle.
And 14, acquiring and recording measurement accuracy of insulation resistances of different finished vehicles under a plurality of different SOCs.
In this way, the steps 11 to 13 can be repeated for different SOCs, so as to obtain the measurement precision of the insulation resistance of different vehicles under different SOCs.
Alternatively, the SOC may be set to 10%,20%,30%,40%,50%,60%,70%,80%,90%,100% respectively, and the test of the above steps may be performed, to finally obtain a test result of the insulation resistance detection accuracy in the vicinity of the insulation failure critical value in the full SOC range.
According to the method for testing the whole vehicle insulation resistance detection precision of the electric vehicle, when the whole vehicle insulation resistance is in a lower state, the insulation resistance detection precision in the full SOC range can be tested, the integrity of test data and test results is guaranteed, and finally the accuracy of insulation fault reporting is guaranteed.
As shown in fig. 2, an embodiment of the present invention further provides a device for testing insulation resistance detection precision of an electric vehicle, including:
a first calculating unit 21, configured to calculate a fault threshold of an insulation resistance of the whole vehicle according to a terminal voltage of the electric vehicle under a preset state of charge SOC;
a setting processing unit 22 for setting an upper limit value of a variable resistor in the SOC lower value range according to the fault threshold value, and connecting the variable resistor in parallel between a positive electrode of a vehicle and a vehicle body ground;
the measurement calculation unit 23 is configured to adjust the resistance of the variable resistor according to a preset step length, and obtain a measured value of the insulation resistance of the whole vehicle and a read value of the insulation resistance of the whole vehicle reported by the ECU under the condition of different resistance values of the variable resistor, and calculate measurement accuracy of different insulation resistances of the whole vehicle under the preset SOC according to the measured value and the read value;
alternatively, the measurement calculation unit 23 adjusts the resistance value of the variable resistor in a range from 0 to the upper limit value of the variable resistor, for example, the preset step size may be set to 500 Ω, and the resistance values of the variable resistor are sequentially set to 0 Ω, 500 Ω, 1000 Ω, 1500 Ω … … from 0 until one resistance value closest to but not exceeding the upper limit value of the variable resistor. And under each resistance value of the set variable resistor, measuring by using an insulation resistance tester to obtain the measured value of the insulation resistance of the whole vehicle.
And the recording unit 24 is used for acquiring and recording the measurement precision of the insulation resistance of different vehicles under a plurality of different SOCs.
Further, the first calculating unit 21 is further configured to measure the terminal voltage of the electric vehicle, and calculate the fault threshold of the insulation resistance of the whole vehicle by multiplying the terminal voltage of the electric vehicle by a preset value.
Specifically, a fault critical value of the insulation resistance of the whole vehicle is obtained through calculation according to a first formula, wherein the first formula is as follows: r0=t0×v0;
wherein R0 represents a fault critical value of the insulation resistance of the whole vehicle, V0 represents terminal voltage of the electric vehicle, the unit is volt, T0 is a preset value, and the unit is ohm/volt.
It should be noted that the value of T0 may be set according to an empirical value or according to actual measurement results of different vehicle types, for example, T0 may be 500 Ω/V.
Further, the setting processing unit 22 is further configured to calculate an upper limit value of the variable resistor, where the upper limit value of the variable resistor is calculated by adding a fault critical value of the insulation resistor of the whole vehicle to a preset resistance value.
Specifically, the upper limit value of the variable resistor is calculated according to a third formula, where the third formula is: upper limit value of variable resistance=r0+r1;
wherein R0 represents a fault critical value of the insulation resistance of the whole vehicle, and R1 represents a preset resistance value.
It should be noted that the value of R1 may be set according to an empirical value or according to an actual measurement result of different vehicle types, for example, R1 may be 500kΩ.
Further, the measurement calculating unit 23 is further configured to read the read value of the insulation resistance of the whole vehicle reported by the ECU, and calculate, according to the measured value and the read value, measurement accuracy of insulation resistances of different whole vehicles under the preset SOC.
It should be noted that, the ECU is a controller for detecting insulation inside the electric vehicle, and may monitor and report the insulation resistance value of the whole vehicle, and calculate to obtain the detection accuracy of the insulation resistance according to the read value and the measured value of the insulation resistance of the whole vehicle.
Specifically, the detection accuracy of the insulation resistance is calculated according to a second formula, wherein the second formula is as follows: detection accuracy of insulation resistance= (1-R/Rt) ×100%;
r represents a read value of the insulation resistance of the whole vehicle reported by the ECU, and Rt represents a measured value of the insulation resistance of the whole vehicle.
Alternatively, the recording unit 24 may set the SOC to 10%,20%,30%,40%,50%,60%,70%,80%,90%,100% respectively, and test the insulation resistance value detection accuracy near the insulation failure critical value in the full SOC range.
It should be noted that, the device for testing the insulation resistance detection precision of the whole electric automobile according to the embodiment can test the insulation resistance detection precision in the full SOC range when the insulation resistance of the whole electric automobile is in a lower state, so as to ensure the integrity of test data and test results and finally ensure the accuracy of reporting insulation faults.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and changes can be made without departing from the principles of the present invention, and such modifications and changes are intended to be within the scope of the present invention.
Claims (8)
1. The method for testing the detection precision of the insulation resistance of the whole electric automobile is characterized by comprising the following steps of:
according to the terminal voltage of the electric vehicle under the preset state of charge (SOC), calculating a fault critical value of the insulation resistance of the whole vehicle;
setting an upper limit value of a variable resistor in a value range under the SOC according to the fault critical value, and connecting the variable resistor in parallel between a positive electrode of a vehicle and a vehicle body ground;
the resistance value of the variable resistor is adjusted according to a preset step length, and under the condition of different resistance values of the variable resistor, a measured value of the whole vehicle insulation resistor and a read value of the whole vehicle insulation resistor reported by an ECU are obtained, and according to the measured value and the read value, the measurement precision of different whole vehicle insulation resistors under the preset SOC is calculated;
acquiring and recording measurement accuracy of insulation resistances of different finished vehicles under a plurality of different SOCs;
the step of calculating the fault critical value of the insulation resistance of the whole vehicle comprises the following steps:
and measuring the terminal voltage of the electric vehicle, and multiplying the terminal voltage of the electric vehicle by a preset value to calculate the fault critical value of the insulation resistance of the whole vehicle.
2. The method according to claim 1, wherein the step of obtaining a measured value of insulation resistance of the whole vehicle comprises:
according to a preset step length, the resistance value of the variable resistor is adjusted within the range from 0 to the upper limit value of the variable resistor;
and under different resistance values of the variable resistor, obtaining a measured value of the insulation resistance of the whole vehicle, which is obtained by an insulation resistance tester, wherein the insulation resistance tester is connected between the positive electrode of the vehicle and the ground of the vehicle body.
3. The test method according to claim 1, wherein,
the step of calculating the measurement accuracy of the insulation resistances of different finished vehicles under the preset SOC comprises the following steps:
and reading the read value of the insulation resistance of the whole vehicle reported by the ECU, and calculating the detection precision of the insulation resistance according to the read value and the measured value of the insulation resistance of the whole vehicle.
4. The testing method according to claim 1, wherein the upper limit value of the variable resistor is calculated by adding a fault threshold value of the insulation resistor of the whole vehicle to a preset resistance value.
5. The utility model provides a testing arrangement of whole car insulation resistance detection precision of electric automobile which characterized in that includes:
the first calculation unit is used for calculating a fault critical value of the insulation resistance of the whole vehicle according to the terminal voltage of the electric vehicle under the preset state of charge (SOC);
a setting processing unit, configured to set an upper limit value of a value range of the variable resistor under the SOC according to the fault critical value, and connect the variable resistor in parallel between a positive pole of a vehicle and a vehicle body ground;
the measuring and calculating unit is used for adjusting the resistance value of the variable resistor according to a preset step length, obtaining a measured value of the whole vehicle insulation resistor and a read value of the whole vehicle insulation resistor reported by the ECU under the condition of different resistance values of the variable resistor, and calculating to obtain the measuring precision of different whole vehicle insulation resistors under the preset SOC according to the measured value and the read value;
the recording unit is used for acquiring and recording the measurement precision of the insulation resistances of different finished vehicles under a plurality of different SOCs;
the first calculation unit is further used for measuring the terminal voltage of the electric vehicle and obtaining the fault critical value of the insulation resistance of the whole vehicle through multiplication calculation of the terminal voltage of the electric vehicle and a preset value.
6. The test device according to claim 5, wherein the measurement calculation unit is further configured to adjust a resistance value of the variable resistor in a range from 0 to an upper limit value of the variable resistor in accordance with a preset step size;
and under different resistance values of the variable resistor, obtaining a measured value of the insulation resistance of the whole vehicle, which is obtained by an insulation resistance tester, wherein the insulation resistance tester is connected between the positive electrode of the vehicle and the ground of the vehicle body.
7. The test device according to claim 5, wherein the measurement calculation unit is further configured to read a read value of the insulation resistance of the whole vehicle reported by the ECU, and calculate the detection accuracy of the insulation resistance according to the read value and the measured value of the insulation resistance of the whole vehicle.
8. The test device according to claim 5, wherein the setting processing unit is further configured to calculate an upper limit value of the variable resistor, where the upper limit value of the variable resistor is calculated by adding a fault threshold value of the insulation resistor of the whole vehicle to a preset resistance value.
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