CN114839497A - Rapid insulation monitoring fault positioning system and method for electric automobile - Google Patents
Rapid insulation monitoring fault positioning system and method for electric automobile Download PDFInfo
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- CN114839497A CN114839497A CN202210785144.7A CN202210785144A CN114839497A CN 114839497 A CN114839497 A CN 114839497A CN 202210785144 A CN202210785144 A CN 202210785144A CN 114839497 A CN114839497 A CN 114839497A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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Abstract
The invention provides a system and a method for quickly positioning insulation monitoring faults of an electric automobile, belonging to the technical field of electric automobiles, wherein the system comprises: the device comprises a power battery module, a high-voltage power distribution module, a motor control module, an insulation monitoring module, a contactor control module and a fault identification module; the power battery module is used for providing a high-voltage power supply for the whole vehicle; the high-voltage distribution module is used for providing high-voltage direct-current voltage for electric components of the whole vehicle; the motor control module is used for driving a motor to provide power for a vehicle; the insulation monitoring module is used for monitoring and calculating insulation resistance of different combination high-voltage systems when different contactors are closed; the contactor control module is used for controlling the closing and opening of contactors in the high-voltage power distribution module and the motor control module; and the fault identification module calculates the corresponding insulation resistance of each independent high-voltage network node according to the insulation resistance value monitored by the insulation monitoring module when different contactors are closed, and judges the position of the insulation fault and the number of the faults.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a system and a method for quickly positioning insulation monitoring faults of an electric automobile.
Background
The pure electric vehicle integrates a high-voltage system and a low-voltage system, and a power battery, a motor, a charger and the like in the high-voltage system all relate to the insulation problem of a high-voltage electrical appliance. The working conditions of these high-voltage components are severe, and vibration, corrosion of acid and alkali gases, high temperature, high humidity and the like may cause aging and even damage of high-voltage power cables and other insulating materials, so that the insulating strength of a high-voltage system to a vehicle body is reduced. The reduction in insulation strength may cause an increase in leakage current from the high-voltage system to the vehicle body, may cause safety problems such as fire or explosion, and may cause a high-voltage electric shock risk to the human body.
In the prior art, an insulation monitoring module can only monitor and report the insulation fault state of a high-voltage system of a whole vehicle, can not locate the position with the insulation fault, and can not accurately locate the number of the positions with the insulation fault. When insulation faults occur in a vehicle high-voltage system, the insulation faults need to be checked one by one, and a large amount of manpower and material resources are needed. Therefore, the method has very important significance in automatically, intelligently, quickly and accurately positioning the position and the quantity of the part with the insulation fault in a complex vehicle high-voltage system.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a system and a method for quickly positioning an insulation monitoring fault of an electric automobile.
In order to achieve the purpose, the invention is realized by the following technical scheme:
an insulation monitoring fault rapid positioning system of an electric automobile comprises: the device comprises a power battery module, a high-voltage power distribution module, a motor control module, an insulation monitoring module, a contactor control module, a fault identification module and a driving motor; the power battery module is connected with the high-voltage power distribution module, the high-voltage power distribution module is connected with the motor control module, the motor control module is connected with the driving motor, the insulation monitoring module is respectively connected with the power battery module, the high-voltage power distribution module and the fault identification module, and the contactor control module is respectively connected with the high-voltage power distribution module and the motor control module;
the power battery module is used for providing a high-voltage power supply for the whole vehicle;
the high-voltage power distribution module distributes a high-voltage direct-current power supply input by the power battery and provides high-voltage direct-current voltage for electric components of the whole vehicle;
the motor control module is used for driving a motor to provide power for a vehicle;
the insulation monitoring module is used for monitoring and calculating insulation resistance of different combined high-voltage systems when different contactors are closed;
the contactor control module is used for controlling the closing and opening of the contactors in the high-voltage power distribution module and the motor control module;
and the fault identification module calculates the corresponding insulation resistance of each independent high-voltage network node according to the insulation resistance value monitored by the insulation monitoring module when different contactors are closed, and judges the position of the insulation fault and the number of the faults.
Furthermore, a power battery is arranged in the power battery module, the high-voltage power distribution module is connected with the positive electrode of the power battery module through a first high-voltage cable, the high-voltage power distribution module is connected with the negative electrode of the power battery module through a second high-voltage cable, the high-voltage power distribution module is connected with the positive electrode of the motor control module through a third high-voltage cable, and the high-voltage power distribution module is connected with the negative electrode of the motor control module through a fourth high-voltage cable, so that high-voltage network distribution is achieved, and power high voltage is provided for the motor control module.
Further, the motor control module is connected with the positive pole of the high-voltage power distribution module through a third high-voltage cable, the motor control module is connected with the negative pole of the high-voltage power distribution module through a fourth high-voltage cable, the motor control module is connected with the positive pole of the driving motor through a fifth high-voltage cable, and the motor control module is connected with the negative pole of the driving motor through a sixth high-voltage cable and used for driving the driving motor to provide power for the vehicle.
Further, the insulation monitoring module is connected with the first high-voltage cable and the second high-voltage cable respectively and used for realizing insulation resistance monitoring.
Further, the high-voltage distribution module comprises a high-voltage distributor, a first contactor, a second contactor, a third contactor and a fourth contactor, wherein the high-voltage distributor is respectively connected with the first contactor, the second contactor, the third contactor and the fourth contactor; the first contactor is connected with a first high-voltage cable and used for controlling connection and disconnection of the high-voltage direct-current positive bus; the second contactor is connected with a second high-voltage cable and used for controlling the connection and disconnection of the high-voltage direct-current negative bus; the third contactor is connected with the third high-voltage cable and used for controlling whether the third high-voltage cable is connected to the high-voltage power supply network or not, and the fourth contactor is connected with the fourth high-voltage cable and used for controlling whether the fourth high-voltage cable is connected to the high-voltage power supply network or not.
Further, the motor control module comprises a motor controller, a fifth contactor, a sixth contactor, a seventh contactor and an eighth contactor, wherein the motor controller is respectively connected with the fifth contactor, the sixth contactor, the seventh contactor and the eighth contactor; the fifth contactor is connected with the third high-voltage cable and used for controlling the connection and disconnection of the positive pole of the motor control module; the sixth contactor is connected with a fourth high-voltage cable and used for controlling the connection and disconnection of the negative pole of the motor control module; the seventh contactor is connected with the positive pole of the load of the driving motor through a fifth high-voltage cable and is used for controlling the connection and disconnection of the positive pole of the driving motor; and the eighth contactor is connected with the negative pole of the load of the driving motor through a sixth high-voltage cable and is used for controlling the connection and disconnection of the negative pole of the driving motor.
Correspondingly, the invention also discloses a method for quickly positioning the insulation monitoring fault of the electric automobile, which comprises the following steps:
step 1: the contactor control module disconnects all the contactors;
step 2: the contactor control module sequentially closes the contactors, and the insulation monitoring module sequentially detects insulation resistance values of different combination high-voltage systems;
and step 3: and the fault judgment module calculates the independent resistance value of each high-voltage system node according to the measured insulation resistance value, and judges the insulation fault position and the insulation quantity.
Further, the high voltage system node comprises: the system comprises a high-voltage system node 1, a high-voltage system node 2, a high-voltage system node 3, a high-voltage system node 4 and a high-voltage system node 5;
the high-voltage system node 1 is arranged between the power battery module and the input end of the high-voltage power distribution module;
the high-voltage system node 2 is arranged between the input end and the output end of the high-voltage distribution module;
the high-voltage system node 3 is arranged between the output end of the high-voltage power distribution module and the input end of the motor control module;
the high-voltage system node 4 is arranged between the input end and the output end of the motor control module;
and the high-voltage system node 5 is arranged between the output end of the motor control module and the input end of the driving motor.
Further, the step 2 comprises:
the insulation monitoring module starts to work, and measures a positive pole ground insulation resistor R0 of a node 1 of the high-voltage system and a negative pole ground insulation resistor R1 of the node 1 of the high-voltage system;
sequentially closing a first contactor, a second contactor, a third contactor, a fourth contactor, a fifth contactor, a sixth contactor, a seventh contactor and an eighth contactor through a contactor control module, and sequentially measuring insulation resistances R2, R3, R4, R5, R6, R7, R8 and R9 after the high-voltage system nodes are combined after each closing;
the insulation resistor R2 is a positive electrode-to-ground insulation resistor of a combined high-voltage system of a high-voltage system node 1 and a high-voltage system node 2; the insulation resistor R3 is a combined high-voltage system negative electrode ground insulation resistor of a high-voltage system node 1 and a high-voltage system node 2; the insulation resistor R4 is a positive electrode-to-ground insulation resistor of a combined high-voltage system of the high-voltage system node 1, the high-voltage system node 2 and the high-voltage system node 3; the insulation resistor R5 is a negative pole-to-ground insulation resistor of a combined high-voltage system of the high-voltage system node 1, the high-voltage system node 2 and the high-voltage system node 3; the insulation resistor R6 is a combined high-voltage system anode-to-ground insulation resistor of a high-voltage system node 1, a high-voltage system node 2, a high-voltage system node 3 and a high-voltage system node 4; the insulation resistor R7 is a combined high-voltage system negative pole ground insulation resistor of a high-voltage system node 1, a high-voltage system node 2, a high-voltage system node 3 and a high-voltage system node 4; the insulation resistor R8 is a combined high-voltage system anode-to-ground insulation resistor of a high-voltage system node 1, a high-voltage system node 2, a high-voltage system node 3, a high-voltage system node 4 and a high-voltage system node 5; the insulation resistor R9 is a combined high-voltage system negative electrode ground insulation resistor of the high-voltage system node 1, the high-voltage system node 2, the high-voltage system node 3, the high-voltage system node 4 and the high-voltage system node 5.
Further, the step 3 comprises:
the fault identification module calculates and analyzes the insulation resistance measured by the insulation monitoring module through an insulation resistance identification algorithm according to the insulation resistance measured by the insulation monitoring module, and calculates a positive pole-to-ground insulation resistance r0 of a high-voltage system node 1, a negative pole-to-ground insulation resistance r1 of the high-voltage system node 1, a positive pole-to-ground insulation resistance r2 of a high-voltage system node 2, a negative pole-to-ground insulation resistance r3 of the high-voltage system node 2, a positive pole-to-ground insulation resistance r4 of a high-voltage system node 3, a negative pole-to-ground insulation resistance r5 of the high-voltage system node 3, a positive pole-to-ground insulation resistance r6 of the high-voltage system node 4, a negative pole-to-ground insulation resistance r7 of the high-voltage system node 5, a positive pole-to-ground insulation resistance r8 of the high-voltage system node 5 and a negative pole-to-ground insulation resistance r9 of the high-voltage system node 5;
and identifying the insulation fault and positioning the fault position by respectively comparing the calculated insulation resistance value with the insulation monitoring resistance threshold value.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a system and a method for quickly positioning insulation monitoring faults of an electric automobile.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a system block diagram of an embodiment of the present invention.
FIG. 2 is a method flow diagram of an embodiment of the present invention.
Fig. 3 is a schematic diagram of a high voltage system node and its equivalent insulation resistance according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The embodiments of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without any inventive work, belong to the scope of protection of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. According to exemplary embodiments of the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment provides a system for quickly locating an insulation monitoring fault of an electric vehicle, which includes a power battery module 100, a high-voltage power distribution module 200, a motor control module 300, an insulation monitoring module 400, a contactor control module 500, a fault identification module 600, and a driving motor.
The high-voltage power distribution module 200 is connected with the positive pole of the power battery module 100 through the first high-voltage cable 701, connected with the negative pole of the power battery module 100 through the second high-voltage cable 702, connected with the positive pole of the motor control module 300 through the third high-voltage cable 703, and connected with the negative pole of the motor control module 300 through the fourth high-voltage cable 704, and is used for high-voltage network distribution to provide power high voltage for the motor control module 300.
The motor control module 300 is connected with the positive pole of the high-voltage power distribution module 200 through a third high-voltage cable 703, connected with the negative pole of the high-voltage power distribution module 200 through a fourth high-voltage cable 704, connected with the positive pole of the driving motor through a fifth high-voltage cable 705, and connected with the negative pole of the driving motor through a sixth high-voltage cable 706, and is used for driving the motor to provide power for the vehicle.
The contactor control module 500 is respectively connected with the high-voltage power distribution module 200 and the motor control module 300, and controls the closing and opening of the first contactor 201, the second contactor 202, the third contactor 203 and the fourth contactor 204 in the high-voltage power distribution module 200, and the closing and opening of the fifth contactor 301, the sixth contactor 302, the seventh contactor 303 and the eighth contactor 304 in the motor control module 300. The first contactor 201, the second contactor 202, the third contactor 203 and the fourth contactor 204 are respectively connected with a high-voltage distributor in the high-voltage power distribution control module 200, and the fifth contactor 301, the sixth contactor 302, the seventh contactor 303 and the eighth contactor 304 are respectively connected with a motor controller in the motor control module 300.
The insulation monitoring module 400 is connected with the direct-current high-voltage positive bus and the direct-current high-voltage negative bus of the power battery module 100 and used for monitoring insulation resistance.
The fault identification module 600 is connected to the insulation monitoring module 400, and performs comprehensive analysis and identification on the insulation resistance value of each dc high-voltage bus measured by the insulation monitoring module 400. Specifically, the fault identification module can calculate the insulation resistance of each corresponding independent high-voltage network node according to the insulation resistance value monitored by the insulation monitoring module when different contactors are closed, and determine the position of the insulation fault and the number of the fault.
Example two:
correspondingly, based on the first embodiment, as shown in fig. 2, the invention also discloses a method for quickly positioning the insulation monitoring fault of the electric vehicle, which comprises the following steps:
step 1: the contactor control module disconnects all the contactors.
The method specifically comprises the following steps: the contactor control module 500 opens the first contactor 201, the second contactor 202, the third contactor 203, the fourth contactor 204, the fifth contactor 301, the sixth contactor 302, the seventh contactor 303, and the eighth contactor 304.
Step 2: the contactor control module closes the contactors in sequence, and the insulation monitoring module detects insulation resistance values of different combination high-voltage systems in sequence.
First, it should be specifically noted that, as shown in fig. 3, the high-voltage system node includes: high-voltage system node 1, high-voltage system node 2, high-voltage system node 3, high-voltage system node 4 and high-voltage system node 5.
The high-voltage system node 1 is arranged between the power battery module and the input end of the high-voltage power distribution module; the high-voltage system node 2 is arranged between the input end and the output end of the high-voltage distribution module; the high-voltage system node 3 is arranged between the output end of the high-voltage power distribution module and the input end of the motor control module; the high-voltage system node 4 is arranged between the input end and the output end of the motor control module; and the high-voltage system node 5 is arranged between the output end of the motor control module and the input end of the driving motor.
Based on the above description, the steps are specifically as follows:
the insulation monitoring module 400 starts to work, and measures the positive insulation resistance R0 to ground of the left high-voltage system node 1 of the first contactor 201 and measures the negative insulation resistance R1 to ground of the left high-voltage system node 1 of the second contactor 202.
The contactor control module 500 closes the first contactor 201, the insulation monitoring module 400 measures a combined high-voltage system positive pole-to-ground insulation resistance R2 of a high-voltage system node 1 and a high-voltage system node 2 on the left side of the third contactor 203, the contactor control module 500 closes the second contact 202, and the insulation monitoring module 400 measures a combined high-voltage system negative pole-to-ground insulation resistance R3 of a high-voltage system node 1 and a high-voltage system node 2 on the left side of the fourth contactor 204; the contactor control module 500 closes the third contactor 203, the insulation monitoring module 400 measures a combined high-voltage system positive pole-to-ground insulation resistance R4 of a high-voltage system node 1, a high-voltage system node 2 and a high-voltage system node 3 on the left side of the fifth contactor 301, the contactor control module 500 closes the fourth contactor 204, and the insulation monitoring module 400 measures a combined high-voltage system negative pole-to-ground insulation resistance R5 of a high-voltage system node 1, a high-voltage system node 2 and a high-voltage system node 3 on the left side of the sixth contactor 302; the contactor control module 500 closes the fifth contactor 301, the insulation monitoring module 400 measures a combined high-voltage system positive pole-to-ground insulation resistance R6 of a high-voltage system node 1, a high-voltage system node 2, a high-voltage system node 3 and a high-voltage system node 4 on the left side of the seventh contactor 303, the contactor control module 500 closes the sixth contactor 302, and the insulation monitoring module 400 measures a combined high-voltage system negative pole-to-ground insulation resistance R7 of a high-voltage system node 1, a high-voltage system node 2, a high-voltage system node 3 and a high-voltage system node 4 on the left side of the eighth contactor 304; the contactor control module 500 closes the seventh contactor 303, the insulation monitoring module 400 measures a combined high-voltage system positive pole-to-ground insulation resistance R8 of the high-voltage system node 1, the high-voltage system node 2, the high-voltage system node 3, the high-voltage system node 4 and the high-voltage system node 5, the contactor control module 500 closes the eighth contactor 304, and the insulation monitoring module 400 measures a combined high-voltage system negative pole-to-ground insulation resistance R9 of the high-voltage system node 1, the high-voltage system node 2, the high-voltage system node 3, the high-voltage system node 4 and the high-voltage system node 5.
And step 3: and the fault judgment module calculates the independent resistance value of each high-voltage system node according to the measured insulation resistance value, and judges the insulation fault position and the insulation quantity.
First, the fault identification module 600 starts to work, and calculates the independent insulation resistance of each high-voltage network node according to the insulation resistance values R0, R1, R2, R3, R4, R5, R6, R7, R8, and R9 of each combined high-voltage system measured by the insulation monitoring module 400. The method comprises the following specific steps: calculating a positive-pole-to-ground insulation resistance r0 of a high-voltage system node 1 between the power battery module 100 and the first contactor 201, calculating a negative-pole-to-ground insulation resistance r1 of a high-voltage system node 1 between the power battery module 100 and the second contactor 202, calculating a positive-pole-to-ground insulation resistance r2 of a high-voltage system node 2 between the first contactor 201 and the third contactor 203, calculating a negative-pole-to-ground insulation resistance r3 of a high-voltage system node 2 between the second contactor 202 and the fourth contactor 204, calculating a positive-pole-to-ground insulation resistance r4 of a high-voltage system node 3 between the third contactor 203 and the fifth contactor 301, calculating a negative-pole-to-ground insulation resistance r5 of a high-voltage system node 3 between the fourth contactor 204 and the sixth contactor 302, calculating a positive-pole-to-ground insulation resistance r6 of a high-voltage system node 4 between the fifth contactor 301 and the seventh contactor 303, calculating a negative-pole-to-ground insulation resistance r7 of a high-voltage system node 4 between the sixth contactor 302 and the eighth contactor 304, and calculating a positive pole-to-ground insulation resistance r8 of a high-voltage system node 5 between the seventh contactor 303 and the driving motor, and calculating a negative pole-to-ground insulation resistance r9 of a high-voltage system node 5 between the eighth contactor 304 and the driving motor.
At this time, the calculated insulation resistance values are compared with the insulation monitoring resistance threshold values, insulation faults are identified, and fault positions are located.
The method specifically comprises the following steps: if r0 is smaller than the insulation monitoring resistance threshold, an insulation fault occurs in the high-voltage cable 701 between the power battery module 100 and the first contactor 201; if r1 is smaller than the insulation monitoring resistance threshold, an insulation fault occurs in the high-voltage cable 702 between the power battery module 100 and the second contactor 202; if r2 is less than the insulation monitoring resistance threshold, an insulation fault occurs in the high voltage distribution module 200 between the first contactor 201 and the third contactor 203; if r3 is less than the insulation monitoring resistance threshold, an insulation fault occurs in the high voltage distribution module 200 between the first contactor 201 and the third contactor 203; if r4 is smaller than the insulation monitoring resistance threshold, an insulation fault occurs in the high-voltage cable 703 between the third contactor 203 and the fifth contactor 301; if r5 is less than the insulation monitoring resistance threshold, an insulation fault occurs in the high-voltage cable 704 between the fourth contactor 204 and the sixth contactor 302; if r6 is less than the insulation monitoring resistance threshold, an insulation fault occurs in the motor control module 300 between the fifth contactor 301 and the seventh contactor 303; if r7 is less than the insulation monitoring resistance threshold, an insulation fault occurs in the motor control module 300 between the sixth contactor 302 and the eighth contactor 304; if r8 is smaller than the insulation monitoring resistance threshold, an insulation fault occurs between the seventh contactor 303 and the driving motor; if r9 is less than the insulation monitoring resistance threshold, an insulation fault occurs between the eighth contactor 304 and the drive motor.
Therefore, the invention measures the insulation resistance of each high-voltage system node in a successive segmentation way aiming at the high-voltage network of the electric automobile, not only can accurately position the high-voltage line or equipment with insulation fault, but also can detect the position number with the insulation fault.
The invention is further described with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.
Claims (10)
1. The utility model provides an electric automobile's quick positioning system of insulation monitoring trouble which characterized in that includes: the device comprises a power battery module, a high-voltage power distribution module, a motor control module, an insulation monitoring module, a contactor control module, a fault identification module and a driving motor; the power battery module is connected with the high-voltage power distribution module, the high-voltage power distribution module is connected with the motor control module, the motor control module is connected with the driving motor, the insulation monitoring module is respectively connected with the power battery module, the high-voltage power distribution module and the fault identification module, and the contactor control module is respectively connected with the high-voltage power distribution module and the motor control module;
the power battery module is used for providing a high-voltage power supply for the whole vehicle;
the high-voltage power distribution module distributes a high-voltage direct-current power supply input by the power battery and provides high-voltage direct-current voltage for electric components of the whole vehicle;
the motor control module is used for driving a motor to provide power for a vehicle;
the insulation monitoring module is used for monitoring and calculating insulation resistance of different combined high-voltage systems when different contactors are closed;
the contactor control module is used for controlling the closing and opening of the contactors in the high-voltage power distribution module and the motor control module;
and the fault identification module calculates the corresponding insulation resistance of each independent high-voltage network node according to the insulation resistance value monitored by the insulation monitoring module when different contactors are closed, and judges the position of the insulation fault and the number of the faults.
2. The system of claim 1, wherein the high voltage power distribution module is connected to a positive pole of the power battery module through a first high voltage cable, the high voltage power distribution module is connected to a negative pole of the power battery module through a second high voltage cable, the high voltage power distribution module is connected to a positive pole of the motor control module through a third high voltage cable, and the high voltage power distribution module is connected to a negative pole of the motor control module through a fourth high voltage cable, so as to distribute a high voltage network and provide a high voltage power for the motor control module.
3. The insulation monitoring fault rapid positioning system of the electric automobile according to claim 2, wherein the motor control module is connected with the positive pole of the high-voltage power distribution module through a third high-voltage cable, the motor control module is connected with the negative pole of the high-voltage power distribution module through a fourth high-voltage cable, the motor control module is connected with the positive pole of the driving motor through a fifth high-voltage cable, and the motor control module is connected with the negative pole of the driving motor through a sixth high-voltage cable, so that the driving motor provides power for the vehicle.
4. The insulation monitoring fault rapid positioning system of the electric automobile according to claim 3, characterized in that the insulation monitoring module is respectively connected with the first high voltage cable and the second high voltage cable for realizing insulation resistance monitoring.
5. The insulation monitoring fault rapid positioning system of the electric automobile according to claim 4, characterized in that the high voltage distribution module comprises a high voltage distributor, a first contactor, a second contactor, a third contactor and a fourth contactor, wherein the high voltage distributor is respectively connected with the first contactor, the second contactor, the third contactor and the fourth contactor; the first contactor is connected with a first high-voltage cable and used for controlling connection and disconnection of the high-voltage direct-current positive bus; the second contactor is connected with a second high-voltage cable and used for controlling the connection and disconnection of the high-voltage direct-current negative bus; the third contactor is connected with the third high-voltage cable and used for controlling whether the third high-voltage cable is connected to the high-voltage power supply network or not, and the fourth contactor is connected with the fourth high-voltage cable and used for controlling whether the fourth high-voltage cable is connected to the high-voltage power supply network or not.
6. The insulation monitoring fault rapid positioning system of the electric automobile according to claim 5, characterized in that the motor control module comprises a motor controller, a fifth contactor, a sixth contactor, a seventh contactor and an eighth contactor, wherein the motor controller is respectively connected with the fifth contactor, the sixth contactor, the seventh contactor and the eighth contactor; the fifth contactor is connected with the third high-voltage cable and used for controlling the connection and disconnection of the positive pole of the motor control module; the sixth contactor is connected with a fourth high-voltage cable and used for controlling the connection and disconnection of the negative pole of the motor control module; the seventh contactor is connected with the positive pole of the load of the driving motor through a fifth high-voltage cable and is used for controlling the connection and disconnection of the positive pole of the driving motor; and the eighth contactor is connected with the negative pole of the load of the driving motor through a sixth high-voltage cable and is used for controlling the connection and disconnection of the negative pole of the driving motor.
7. A method for quickly positioning insulation monitoring faults of an electric automobile is characterized by comprising the following steps:
step 1: the contactor control module disconnects all the contactors;
step 2: the contactor control module sequentially closes the contactors, and the insulation monitoring module sequentially detects insulation resistance values of different combined high-voltage systems;
and step 3: and the fault judgment module calculates the independent resistance value of each high-voltage system node according to the measured insulation resistance value, and judges the insulation fault position and the insulation quantity.
8. The insulation monitoring fault rapid positioning method for the electric automobile according to claim 7, wherein the high-voltage system node comprises: the system comprises a high-voltage system node 1, a high-voltage system node 2, a high-voltage system node 3, a high-voltage system node 4 and a high-voltage system node 5;
the high-voltage system node 1 is arranged between the power battery module and the input end of the high-voltage power distribution module;
the high-voltage system node 2 is arranged between the input end and the output end of the high-voltage distribution module;
the high-voltage system node 3 is arranged between the output end of the high-voltage power distribution module and the input end of the motor control module;
the high-voltage system node 4 is arranged between the input end and the output end of the motor control module;
and the high-voltage system node 5 is arranged between the output end of the motor control module and the input end of the driving motor.
9. The insulation monitoring fault rapid positioning method of the electric automobile according to claim 8, wherein the step 2 comprises:
the insulation monitoring module starts to work, and measures a positive pole ground insulation resistor R0 of a node 1 of the high-voltage system and a negative pole ground insulation resistor R1 of the node 1 of the high-voltage system;
sequentially closing a first contactor, a second contactor, a third contactor, a fourth contactor, a fifth contactor, a sixth contactor, a seventh contactor and an eighth contactor through a contactor control module, and sequentially measuring insulation resistances R2, R3, R4, R5, R6, R7, R8 and R9 after the high-voltage system nodes are combined after each closing;
the insulation resistor R2 is a positive electrode-to-ground insulation resistor of a combined high-voltage system of a high-voltage system node 1 and a high-voltage system node 2; the insulation resistor R3 is a combined high-voltage system negative electrode ground insulation resistor of a high-voltage system node 1 and a high-voltage system node 2; the insulation resistor R4 is a positive electrode-to-ground insulation resistor of a combined high-voltage system of a high-voltage system node 1, a high-voltage system node 2 and a high-voltage system node 3; the insulation resistor R5 is a negative pole-to-ground insulation resistor of a combined high-voltage system of the high-voltage system node 1, the high-voltage system node 2 and the high-voltage system node 3; the insulation resistor R6 is a combined high-voltage system anode-to-ground insulation resistor of a high-voltage system node 1, a high-voltage system node 2, a high-voltage system node 3 and a high-voltage system node 4; the insulation resistor R7 is a combined high-voltage system negative pole ground insulation resistor of a high-voltage system node 1, a high-voltage system node 2, a high-voltage system node 3 and a high-voltage system node 4; the insulation resistor R8 is a combined high-voltage system anode-to-ground insulation resistor of a high-voltage system node 1, a high-voltage system node 2, a high-voltage system node 3, a high-voltage system node 4 and a high-voltage system node 5; the insulation resistor R9 is a combined high-voltage system negative electrode ground insulation resistor of the high-voltage system node 1, the high-voltage system node 2, the high-voltage system node 3, the high-voltage system node 4 and the high-voltage system node 5.
10. The insulation monitoring fault rapid positioning method of the electric automobile according to claim 9, wherein the step 3 comprises:
the fault identification module calculates and analyzes the insulation resistance measured by the insulation monitoring module through an insulation resistance identification algorithm according to the insulation resistance measured by the insulation monitoring module, and calculates a positive electrode ground insulation resistance r0 of a high-voltage system node 1, a negative electrode ground insulation resistance r1 of the high-voltage system node 1, a positive electrode ground insulation resistance r2 of a high-voltage system node 2, a negative electrode ground insulation resistance r3 of the high-voltage system node 2, a positive electrode ground insulation resistance r4 of a high-voltage system node 3, a negative electrode ground insulation resistance r5 of the high-voltage system node 3, a positive electrode ground insulation resistance r6 of the high-voltage system node 4, a negative electrode ground insulation resistance r7 of the high-voltage system node 4, a positive electrode ground insulation resistance r8 of the high-voltage system node 5 and a negative electrode ground insulation resistance r9 of the high-voltage system node 5;
and respectively comparing the calculated insulation resistance value with an insulation monitoring resistance threshold value, identifying an insulation fault, and positioning a fault position.
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