CN111474453A - Insulation detection circuit, method for detecting insulation fault of component and vehicle - Google Patents
Insulation detection circuit, method for detecting insulation fault of component and vehicle Download PDFInfo
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- CN111474453A CN111474453A CN202010413528.7A CN202010413528A CN111474453A CN 111474453 A CN111474453 A CN 111474453A CN 202010413528 A CN202010413528 A CN 202010413528A CN 111474453 A CN111474453 A CN 111474453A
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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
- G01R31/005—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
- 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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- 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 discloses an insulation detection circuit, a method for detecting insulation faults of components and a vehicle. The circuit includes: the device comprises an electric vehicle high-voltage system circuit, an insulation monitoring device and a detection control device. Electric motor car high-voltage system circuit includes: the system comprises a power battery, a main relay pair, at least one key high-voltage component, a key relay pair which is connected with each key high-voltage component in a one-to-one correspondence manner, at least one conventional high-voltage component and a conventional relay pair which is connected with each conventional high-voltage component; the insulation monitoring device is connected with the current output end and the current input end of the power battery; and the detection control device is respectively connected with the electric vehicle high-voltage system circuit and the insulation monitoring device and is used for determining the insulation faults of each key high-voltage component and/or conventional high-voltage component in the electric vehicle high-voltage system circuit. The invention realizes the effect of quickly confirming the position of the insulation failure component and the insulation resistance value thereof, and can adopt different processing modes according to different failure components.
Description
Technical Field
The embodiment of the invention relates to the technical field of vehicle control, in particular to an insulation detection circuit, a component insulation fault detection method and a vehicle.
Background
The electric vehicle is driven by a power battery to run, and the output voltage of the power battery far exceeds the safety voltage of a human body, so that insulation detection of the electric vehicle is indispensable.
The insulation monitoring system of general electric automobile can only monitor whether high-voltage component has taken place insulation failure, can't fix a position failure part, has two aspects drawbacks: firstly, when after-sale maintenance is carried out, maintenance personnel are required to check the high-voltage components one by one, the maintenance time is long, and the plugging times of the high-voltage connector are lost; and secondly, under the condition that specific failure components are not clear, the refining treatment of the insulation fault in the whole vehicle running state is not facilitated.
Disclosure of Invention
The invention provides an insulation detection circuit, a detection method of insulation fault of a component and a vehicle, which are used for quickly confirming the position of an insulation failure component and the insulation resistance value of the insulation failure component when the vehicle has the insulation fault.
In a first aspect, an embodiment of the present invention provides an insulation detection circuit, where the insulation detection circuit includes: the system comprises an electric vehicle high-voltage system circuit, an insulation monitoring device and a detection control device;
the electric motor car high-voltage system circuit includes: the system comprises a power battery, a main relay pair, at least one key high-voltage component, a key relay pair which is connected with each key high-voltage component in a one-to-one correspondence manner, at least one conventional high-voltage component and a conventional relay pair which is connected with each conventional high-voltage component;
the first end of the insulation monitoring device is connected with the current output end of the power battery, and the second end of the insulation monitoring device is connected with the current input end of the power battery;
the detection control device is respectively connected with the electric vehicle high-voltage system circuit and the insulation monitoring device and is used for detecting the insulation resistance value of each key high-voltage component and/or conventional high-voltage component of the electric vehicle high-voltage system circuit through the insulation monitoring device and determining the insulation fault of each key high-voltage component and/or conventional high-voltage component in the electric vehicle high-voltage system circuit;
the detection control device is also used for determining the insulation fault detection of each key high-voltage component and the conventional high-voltage component through on-off control of each key relay pair and on-off control of the conventional relay pair.
Optionally, a first end of a first main relay in the main relay pairs is connected to a first end of the insulation detection device, and a second end of the first main relay is connected to a first end of a first key relay in each key relay pair and a first end of a first conventional relay in the conventional relay pairs respectively;
the second end of each first key relay is respectively connected with the current input end of the corresponding key high-voltage component, and the second end of each first conventional relay is respectively connected with the current input end of each conventional high-voltage component;
the current output end of each key high-voltage component is respectively connected with the first end of a second key relay in the corresponding key relay pair, and the current output end of each conventional high-voltage component is respectively connected with the first end of a second conventional relay in the conventional relay pair;
the second end of each second key relay and the second end of the second conventional relay are respectively connected with the first end of the second main relay in the main relay pair;
and the second end of the second main relay is connected with the second end of the insulation detection device.
In a second aspect, an embodiment of the present invention further provides a method for detecting a component insulation fault, where the method includes:
controlling to disconnect each key relay pair and the conventional relay pair;
acquiring a first insulation resistance value corresponding to the power battery monitored by the insulation monitoring device after each key relay pair and the conventional relay pair are disconnected;
and when the first insulation resistance value is smaller than or equal to a set insulation failure value, determining the power battery as an insulation failure component, and recording the first insulation resistance value.
Optionally, the method further includes:
when the first insulation resistance value is larger than the set insulation failure value, selecting a current relay pair to be closed from unselected key relay pairs or the conventional relay pair;
determining a target high-voltage component associated with the current relay pair to be closed, and controlling the current relay pair to be closed;
acquiring a second insulation resistance value corresponding to the target high-voltage component monitored by the insulation monitoring device after the current relay pair to be closed is closed;
and determining the insulation detection result of the target high-voltage component according to the comparison between the second insulation resistance value and the set insulation failure value.
Optionally, the determining the insulation detection result of the target high-voltage component according to the comparison between the second insulation resistance value and the set insulation failure value includes:
if the current relay pair to be closed is a key relay pair, when the second insulation resistance value is smaller than or equal to the set insulation failure value, determining that the target high-voltage component is an insulation failure component according to the insulation detection result;
if the current relay pair to be closed is a conventional relay pair, determining that an insulation failure component exists in each conventional high-voltage component when the second insulation resistance value is smaller than or equal to the set insulation failure value;
and recording the insulation resistance currently corresponding to the insulation failure component.
Optionally, after determining the insulation detection result of the target high-voltage component, the method further includes:
when the insulation detection result shows that the target high-voltage component is an insulation failure component, disconnecting the current relay pair to be closed, taking other unselected key relay pairs or conventional relay pairs as candidate relay pairs, and controlling to close the candidate relay pairs;
acquiring candidate insulation resistance values of the candidate relays corresponding to the associated high-voltage components, which are monitored by the insulation monitoring device;
if the candidate insulation resistance value is less than or equal to the set insulation failure value, disconnecting each candidate relay pair and returning to continuously execute the selected operation of the current relay pair to be closed; otherwise, ending the insulation fault detection.
Optionally, after determining the insulation detection result of the target high-voltage component, the method further includes:
and when the insulation detection result shows that the target high-voltage component is not an insulation failure component, controlling the current relay pair to be closed to be in a closed state, and returning to continue to execute the selected operation of the current relay pair to be closed until all key relay pairs or conventional relay pairs are selected.
Optionally, the method further includes:
and carrying out insulation failure treatment on the insulation failure component detected from the electric vehicle high-voltage system circuit.
Optionally, the performing insulation failure processing on the insulation failure component detected from the electric vehicle high-voltage system circuit includes:
aiming at a key high-voltage failure component serving as an insulation failure component in the electric vehicle high-voltage system circuit, performing acousto-optic alarm, and forbidding high-voltage charging and charging operations;
and performing insulation failure alarm aiming at the conventional high-voltage failure component serving as the insulation failure component in the electric vehicle high-voltage system circuit.
In a third aspect, an embodiment of the present invention further provides a vehicle, including:
the high-voltage system circuit of the electric vehicle comprises a power battery, a main relay pair, at least one key high-voltage component, a key relay pair which is connected with each key high-voltage component in a one-to-one corresponding mode, at least one conventional high-voltage component and a conventional relay pair which is connected with each conventional high-voltage component;
the insulation monitoring device is connected with a high-voltage system circuit of the electric vehicle and used for monitoring the insulation resistance of the power battery, each key high-voltage component and each conventional high-voltage component;
a memory for storing executable instructions;
a controller for implementing the insulation fault detection method according to any embodiment of the present invention when executing executable instructions stored in the memory.
The invention divides the high voltage components of the electric vehicle into key high voltage components and conventional high voltage components, connects each key high voltage component with a group of key relay pairs correspondingly, connects all conventional high voltage components with a group of conventional relay pairs, when the vehicle has insulation fault, the detection control device can detect the insulation resistance value of each key high-voltage component and/or conventional high-voltage component of the high-voltage system circuit of the electric vehicle through the insulation monitoring device to determine the insulation fault of each key high-voltage component and/or conventional high-voltage component in the high-voltage system circuit of the electric vehicle, so that the problem that the insulation monitoring system of the electric vehicle can only monitor that the high-voltage component has insulation failure is solved, but the problem that the failure component can not be positioned is solved, the effect of quickly confirming the position of the insulation failure component and the insulation resistance value of the insulation failure component is realized, and different processing modes can be adopted according to different failure components.
Drawings
Fig. 1 is a block diagram of an insulation detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a high-voltage system circuit of an electric vehicle according to an embodiment of the invention;
fig. 3 is a flowchart of a method for detecting insulation fault of a component according to a second embodiment of the present invention;
fig. 4 is another flowchart of a method for detecting an insulation fault of a component according to a second embodiment of the present invention;
fig. 5 is a block diagram of a vehicle according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be noted that, for convenience of description, only a part of the structures related to the present invention, not all of the structures, are shown in the drawings, and furthermore, embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Example one
Fig. 1 is a block diagram of an insulation detection circuit according to an embodiment of the present invention. As shown in fig. 1, the circuit includes: the high-voltage system circuit 110 of the electric vehicle, the insulation monitoring device 120 and the detection control device 130.
The electric vehicle high-voltage system circuit 110 includes: the high-voltage power supply comprises a power battery, a main relay pair, at least one key high-voltage component, a key relay pair which is connected with each key high-voltage component in a one-to-one correspondence mode, at least one conventional high-voltage component and a conventional relay pair which is connected with each conventional high-voltage component.
A first end of the insulation monitoring device 120 may be connected to a current output of the power battery, and a second end of the insulation monitoring device 120 may be connected to a current input of the power battery.
The detection control device 130 is connected to the electric vehicle high-voltage system circuit 110 and the insulation monitoring device 120, and is configured to detect insulation resistance values of each key high-voltage component and/or a conventional high-voltage component of the electric vehicle high-voltage system circuit 110 through the insulation monitoring device 120, and determine an insulation fault of each key high-voltage component and/or a conventional high-voltage component in the electric vehicle high-voltage system circuit 110.
The detection control device 130 is further configured to determine insulation fault detection of each of the key high-voltage components and the conventional high-voltage components through on-off control of each of the key relay pairs and on-off control of the conventional relay pairs, respectively.
The power battery can provide energy required by the running of the whole electric vehicle, and the main relay pair can be connected near the power battery and used for controlling the on-off of main circuits at two ends of the power battery. The high-voltage components of the electric vehicle are grouped according to specific functions and importance degrees, and the influence degree of the failure of the components, whether the shell of the components is conductive or not, whether the components are favorable for disassembly or self-definition can be determined according to a whole vehicle factory. The high-voltage components of the electric vehicle can be divided into key high-voltage components and conventional high-voltage components, each key high-voltage component is correspondingly connected with one group of key relay pairs, and all the conventional high-voltage components are connected with one group of conventional relay pairs.
The insulation monitoring device 120 may take a stand-alone form or may be integrated in a vehicle BMS, and its connection point to the electric vehicle high voltage system circuit 110 is selected between the power battery and the main relay pair.
The detection control device 130 may control each key relay pair and the conventional relay pair to be turned on or turned off when an insulation fault occurs in the vehicle, and simultaneously control the insulation monitoring device 120 to monitor insulation resistance values of each key relay pair and the conventional relay pair when the key relay pair and the conventional relay pair are turned on or turned off, respectively, and when the insulation resistance values are sharply decreased, it indicates that an insulation fault occurs in the corresponding key high-voltage component or the conventional high-voltage component.
The embodiment of the invention divides the high-voltage components of the electric vehicle into the key high-voltage components and the conventional high-voltage components, connects each key high-voltage component with a group of key relay pairs correspondingly, connects all the conventional high-voltage components with a group of conventional relay pairs, when the vehicle has insulation fault, the detection control device can detect the insulation resistance value of each key high-voltage component and/or conventional high-voltage component of the high-voltage system circuit of the electric vehicle through the insulation monitoring device to determine the insulation fault of each key high-voltage component and/or conventional high-voltage component in the high-voltage system circuit of the electric vehicle, so that the problem that the insulation monitoring system of the electric vehicle can only monitor that the high-voltage component has insulation failure is solved, but the problem that the failure component can not be positioned is solved, the effect of quickly confirming the position of the insulation failure component and the insulation resistance value of the insulation failure component is realized, and different processing modes can be adopted according to different failure components.
Further, fig. 2 is a schematic diagram of an electric vehicle high-voltage system circuit according to an embodiment of the present invention, where the electric vehicle high-voltage system circuit 110 includes: the high-voltage power supply comprises a power battery P, a main relay pair K1 and K2, at least one key high-voltage component 1-N, a key relay pair S1-S2N connected with the key high-voltage components 1-N in a one-to-one correspondence mode, at least one conventional high-voltage component 1-N and a conventional relay pair S2N +1 and S2N +2 connected with the conventional high-voltage components 1-N.
The first end of the first main relay K1 in the main relay pair is connected with the first end of the insulation detection device 120, and the second end of the first main relay K1 is connected with the first ends of the first key relays S1, S3, … … and S2n-1 in each key relay pair and the first end of the first conventional relay S2n +1 in the conventional relay pair respectively.
The second ends of the first key relays S1, S3, … … and S2N-1 are respectively connected with the current input ends of the corresponding key high-voltage components 1-N, and the second ends of the first conventional relays S2N +1 are respectively connected with the current input ends of the conventional high-voltage components 1-N.
The current output ends of the key high-voltage components 1-N are respectively connected with first ends of second key relays S2, S4, … … and S2N in corresponding key relay pairs, and the current output ends of the conventional high-voltage components 1-N are respectively connected with first ends of second conventional relays S2N +2 in the conventional relay pairs.
The second ends of the respective second key relays S2, S4, … …, S2n and the second end of the second conventional relay S2n +2 are connected to the first end of the second main relay K2 of the main relay pair, respectively.
A second end of the second main relay K2 is connected to a second end of the insulation detection device 120.
The embodiment of the invention provides a specific topological structure of the electric vehicle high-voltage system circuit to clearly illustrate the connection relation of all parts in the electric vehicle high-voltage system circuit, when insulation failure is checked, the main relay pair can be controlled to be closed to measure the insulation condition of a power battery, the key relay pairs and the conventional relay pairs are closed one by one to test the insulation resistance of the high-voltage parts, two ends of each key high-voltage part are connected with one group of key relay pairs, and each loop can be independently measured and accurately positioned and applied in time when insulation failure occurs.
Example two
Fig. 3 is a flowchart of a method for detecting an insulation fault of a component according to a second embodiment of the present invention, where the second embodiment is applicable to a situation where a location of an insulation-failed component and an insulation resistance value thereof are quickly determined when an insulation fault occurs in a vehicle, and the method may be executed by the detection control device in the above-described embodiments, and the device may be implemented by software and/or hardware.
As shown in fig. 3, the method specifically includes the following steps:
and step 210, controlling to disconnect each key relay pair and the conventional relay pair.
Specifically, when the vehicle has an insulation fault, each key relay pair and the conventional relay pair can be disconnected, and only the main relay pair is closed, so that the power battery is subjected to insulation detection. As shown in fig. 2, when the vehicle has an insulation fault, the key relay pairs S1-S2 n and the conventional relay pairs S2n +1 and S2n +2 can be opened, and the key relay pairs K1 and K2 can be closed.
And step 220, the obtained insulation monitoring device monitors a first insulation resistance value corresponding to the power battery after each key relay pair and the conventional relay pair are disconnected.
The first insulation resistance value can be understood as a resistance value parameter detected by the insulation monitoring device in the electric vehicle high-voltage system circuit after each key relay pair and the conventional relay pair are disconnected, and at the moment, no other key high-voltage component or conventional high-voltage component exists in the electric vehicle high-voltage system circuit loop except for the power battery, so that the first insulation resistance value can be expressed as an insulation resistance value corresponding to the power battery and used for determining the insulation condition of the power battery.
Specifically, after each key relay pair and the conventional relay pair are disconnected, the insulation monitoring device is controlled to monitor the insulation resistance value of the high-voltage system circuit of the electric vehicle, and the monitored insulation resistance value is recorded as a first insulation resistance value.
And step 230, when the first insulation resistance value is smaller than or equal to the set insulation failure value, determining that the power battery is an insulation failure component, and recording the first insulation resistance value.
The set insulation failure value may be understood as a judgment value for determining whether the insulation of the insulating member is failed, and when the insulation resistance value of the insulating member is less than or equal to the set insulation failure value, the insulation of the insulating member may be determined to be failed.
Specifically, can compare the first insulation resistance value that power battery corresponds with insulating failure value of settlement, when first insulation resistance value is less than or equal to insulating failure value of settlement, explain that power battery's insulating effect does not reach insulating standard, consequently can confirm that power battery is insulating failure part, record power battery current corresponding insulation resistance, first insulation resistance value promptly, stop the detection flow, can feed back first insulation resistance value to vehicle control device and user, so that in time inspect the maintenance to power battery.
According to the technical scheme, when the vehicle has an insulation fault, all key relay pairs and conventional relay pairs are disconnected, the insulation monitoring device is controlled to monitor the insulation resistance value of the power battery, whether the power battery has insulation failure or not is determined, the power battery is subjected to insulation detection before high-voltage components are subjected to insulation detection, the problem of inaccurate insulation failure of the high-voltage components can be solved, the insulation detection is performed on the high-voltage components after the insulation condition of the power battery is determined, and the accuracy and the rationality of the insulation detection of the high-voltage components can be improved.
Further, on the basis of the above technical solution, fig. 4 shows another flowchart of a method for detecting a component insulation fault according to a second embodiment of the present invention, and as shown in fig. 4, the method may include the following steps:
and S2100, controlling to disconnect each key relay pair and the conventional relay pair.
And S2200, obtaining a first insulation resistance value corresponding to the power battery after the insulation monitoring device disconnects each key relay pair and the conventional relay pair.
S2300, judging whether the first insulation resistance value is smaller than or equal to the set insulation failure value.
Specifically, the first insulation resistance value of the power battery may be compared with a set insulation failure value, and when the first insulation resistance value is less than or equal to the set insulation failure value, step 2400 is performed; otherwise, go to step 2401.
And 2400, determining that the power battery is an insulation failure component, and recording a first insulation resistance value.
Specifically, when the first insulation resistance value is less than or equal to the set insulation failure value, it is determined that the insulation effect of the power battery does not reach the insulation standard, and therefore the power battery can be determined to be an insulation failure component, the current corresponding first insulation resistance value of the power battery is recorded, and step 2410 is performed.
When the first insulation resistance value is larger than the set insulation failure value, the power battery can be normal, insulation faults do not occur, whether insulation faults occur to high-voltage components in a high-voltage system circuit of the electric vehicle or not needs to be detected in sequence, the current relay pair to be closed can be understood as a relay pair corresponding to a key high-voltage component to be detected or a conventional high-voltage component, and each unselected key relay pair or conventional relay pair can be understood as a relay pair corresponding to a key high-voltage component or a conventional high-voltage component which is not detected yet.
Specifically, when the first insulation resistance value is larger than the set insulation failure value, insulation faults of key high-voltage components and conventional high-voltage components in a high-voltage system circuit of the electric vehicle are detected, and a group of relay pairs are selected from relay pairs corresponding to the key high-voltage components or the conventional high-voltage components which are not detected and serve as current relay pairs to be closed.
The target high-voltage component can be understood as a key high-voltage component or a conventional high-voltage component which can be controlled by the relay pair to be closed at present.
The second insulation resistance value can be understood as the resistance value parameter in the electric vehicle high-voltage system circuit detected by the insulation monitoring device after the current relay pair to be closed is closed, at the moment, the switch state of the current relay pair to be closed is only changed in the electric vehicle high-voltage system circuit compared with the last detection state, and the current relay pair to be closed is related to the target high-voltage component, so that the second insulation resistance value can be expressed as the insulation resistance value corresponding to the target high-voltage component and is used for determining the insulation condition of the target high-voltage component.
Specifically, after the current relay pair to be closed is closed, the insulation monitoring device is controlled to monitor the insulation resistance value in the electric vehicle high-voltage system circuit, and the monitored insulation resistance value is recorded as a second insulation resistance value.
Specifically, the second insulation resistance value may be compared with a set insulation failure value, and when the second insulation resistance value is less than or equal to the set insulation failure value, it is determined that the insulation effect of the target high-voltage component does not reach the insulation standard, so that the target high-voltage component may be determined to be an insulation failure component, and the insulation resistance currently corresponding to the target high-voltage component is recorded.
Optionally, the determining the insulation detection result of the target high-voltage component according to the comparison between the second insulation resistance value and the set insulation failure value includes:
if the current relay pair to be closed is a key relay pair, when the second insulation resistance value is smaller than or equal to the set insulation failure value, determining that the target high-voltage component is an insulation failure component according to the insulation detection result;
if the current relay pair to be closed is a conventional relay pair, determining that an insulation failure component exists in each conventional high-voltage component when the second insulation resistance value is smaller than or equal to the set insulation failure value;
and recording the insulation resistance corresponding to the insulation failure component at present.
Specifically, since one key high-voltage component is controlled by a group of key relay pairs, if the current relay pair to be closed is the key relay pair and the second insulation resistance value is less than or equal to the set insulation failure value, the target high-voltage component can be considered, that is, the key high-voltage component controlled by the key relay pair is an insulation failure component; and if the current relay pair to be closed is the conventional relay pair, when the monitored second insulation resistance is less than or equal to the value of the set insulation failure value, the target high-voltage component can be considered, namely, the insulation failure components exist in all the conventional high-voltage components controlled by the conventional relay pair.
Specifically, it is determined whether the target high-voltage component is an insulation failure component, and if so, step 2407 is performed; otherwise, step 2406 is performed.
Specifically, whether unselected relay pairs exist in each key relay pair or conventional relay pair is judged, and if all the key relay pairs and the conventional relay pairs are selected, the step 2411 is executed; otherwise, the current relay pair to be closed needs to be reselected to perform the detection operation of the next target high-voltage component, the current relay pair to be closed can be opened and then returned to perform the step 2401, and the current relay pair to be closed can also be kept closed and directly returned to perform the step 2401.
Optionally, when the insulation detection result indicates that the target high-voltage component is not an insulation failure component, the current relay pair to be closed is controlled to be in a closed state, and the current relay pair to be closed is returned to continue to perform the operation of selecting the current relay pair to be closed until all key relay pairs or conventional relay pairs are selected.
Specifically, when the insulation detection result indicates that the target high-voltage component is not an insulation failure component, the current relay pair to be closed is kept closed, and the step 2401 is directly executed until all the key relay pairs or the conventional relay pairs are selected, that is, after insulation fault detection is performed on all the key high-voltage components and the conventional high-voltage components, the step 2411 is executed.
Among these, the candidate relay pair may be understood as a relay pair corresponding to a key high-voltage component and a normal high-voltage component that have not been separately detected.
Specifically, when the target high-voltage component is an insulation failure component, it may be considered that a certain insulation failure component in the electric vehicle high-voltage system circuit has been detected, at this time, the relay corresponding to the insulation failure component may be opened, other unselected key relay pairs or conventional relay pairs may be used as candidate relay pairs, and the closing of each candidate relay pair is controlled, the undetected key high-voltage component and the conventional high-voltage component are detected together once, and it is determined whether the insulation failure component exists.
The candidate insulation resistance value can be understood as resistance value parameters used for judging whether insulation failure components exist in key high-voltage components and conventional high-voltage components which are not detected independently or not in the electric vehicle high-voltage system circuit after the relay pairs related to the detected insulation failure components are disconnected and the candidate relay pairs are closed.
Specifically, after each candidate relay pair is closed, the insulation monitoring device is controlled to monitor the insulation resistance value in the electric vehicle high-voltage system circuit, and the monitored insulation resistance value is recorded as a candidate insulation resistance value.
Specifically, the candidate insulation resistance value may be compared with the set insulation failure value, and if the candidate insulation resistance value is less than or equal to the set insulation failure value, the step 2410 is executed; otherwise, it may be considered that there is no insulation failure component in the key high voltage component and the conventional high voltage component that have not been separately detected, step 2411 is performed.
And step 2410, disconnecting each candidate relay pair.
Specifically, when the candidate insulation resistance value is less than or equal to the set insulation failure value, it may be considered that the insulation failure component still exists in the key high-voltage component and the conventional high-voltage component that have not been separately detected, and therefore, it is necessary to disconnect each candidate relay pair and return to step 2401 to continue to perform the operation of selecting the current relay pair to be closed.
And step 2411, ending the insulation fault detection.
And 2412, carrying out insulation failure treatment on the insulation failure component detected from the electric vehicle high-voltage system circuit.
Specifically, the detected corresponding position and insulation resistance value of the insulation failure component can be fed back, and corresponding fault treatment can be carried out on the insulation failure faults of the power battery and the key high-voltage component after fault alarm.
Optionally, the insulation failure processing on the insulation failure component detected from the electric vehicle high-voltage system circuit includes:
aiming at a key high-voltage failure component serving as an insulation failure component in a high-voltage system circuit of the electric vehicle, performing acousto-optic alarm, and forbidding high-voltage power supply and charging operation;
and (3) performing insulation failure alarm aiming at the conventional high-voltage failure component serving as the insulation failure component in the electric vehicle high-voltage system circuit.
Specifically, if the insulation failure component comprises a key high-voltage component, operations such as audible and visual alarm, prohibition of power-on again and prohibition of charging before fault recovery after high-voltage power-off can be performed through the instrument device; if the insulation failure is the conventional high-voltage component, the alarm of the insulation failure can be only carried out when the instrument device is put in, and the prompt is carried out as early as possible for maintenance.
Illustratively, the detection is performed on the high-voltage system circuit of the electric vehicle as shown in fig. 2. When the vehicle has an insulation fault, the key relay pairs S1-S2 n and the conventional relay pairs S2n +1 and S2n +2 can be disconnected, K1 and K2 are closed, a first insulation resistance value of the power battery monitored by the insulation monitoring device is obtained, if the first insulation resistance value is larger than a set insulation failure value, S1 and S2 are selected as the current relay pair to be closed, the key high-voltage component 1 is a target high-voltage component, S1 and S2 are closed, a second insulation resistance value monitored by the insulation monitoring device is obtained, if the second insulation resistance value is smaller than or equal to the set insulation failure value, the key high-voltage component 1 can be determined to be an insulation failure component, S1 and S2 are disconnected, the key relay pairs S3-S2 n and the conventional relay pairs S2n +1 and S2n +2 are used as candidate relay pairs, the key relay pairs S3-S2 n and the conventional relay pairs S2n +1 and S2 +2, and S2n are obtained by the insulation monitoring device, if the candidate insulation resistance value is less than or equal to the set insulation failure value, it can be shown that insulation failure components exist in the key high-voltage components 2-N and the conventional high-voltage components 1-N, the key relay pairs S3-S2N and the conventional relay pairs S2N +1 and S2N +2 are disconnected, the current relay pair to be closed is reselected to be S3 and S4, and insulation failure detection is continued. After the insulation fault is detected, sound and light alarm, high voltage supply prohibition and charging prohibition are carried out on the key high-voltage component 1, and corresponding insulation failure treatment is also carried out on other insulation failure components detected from the electric vehicle high-voltage system circuit.
According to the technical scheme, when the vehicle has an insulation fault, the on and off of each key relay pair and the conventional relay pair are sequentially controlled, whether insulation failure occurs in each key high-voltage component and the conventional high-voltage component is determined respectively, the problem that the position of the insulation failure component cannot be determined can be solved, and meanwhile, the position and failure information of the insulation failure component can be directly determined by sequentially carrying out insulation detection on the key high-voltage component and the conventional high-voltage component, so that a stricter processing control strategy is applied.
EXAMPLE III
Fig. 5 is a block diagram of a vehicle according to a third embodiment of the present invention, as shown in fig. 5, the vehicle includes a controller 310, a memory 320, an electric vehicle high-voltage system circuit 330, and an insulation monitoring device 340; the number of controllers 310 in the vehicle may be one or more, and one controller 310 is illustrated in fig. 5; the controller 310, the memory 320, the electric vehicle high voltage system circuit 330, and the insulation monitoring device 340 in the vehicle may be connected by a bus or other means, and are exemplified by being connected by a bus in fig. 5.
The memory 320 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 320 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 320 may further include memory located remotely from the controller 310, which may be connected to the vehicle over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The high-voltage system circuit 330 of the electric vehicle comprises a power battery, a main relay pair, at least one key high-voltage component, a key relay pair which is connected with each key high-voltage component in a one-to-one correspondence manner, at least one conventional high-voltage component and a conventional relay pair which is connected with each conventional high-voltage component.
The insulation monitoring device 340 is connected with a high-voltage system circuit of the electric vehicle and can be used for monitoring the insulation resistance of a power battery, each key high-voltage component and each conventional high-voltage component.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An insulation detection circuit, comprising: the system comprises an electric vehicle high-voltage system circuit, an insulation monitoring device and a detection control device;
the electric motor car high-voltage system circuit includes: the system comprises a power battery, a main relay pair, at least one key high-voltage component, a key relay pair which is connected with each key high-voltage component in a one-to-one correspondence manner, at least one conventional high-voltage component and a conventional relay pair which is connected with each conventional high-voltage component;
the first end of the insulation monitoring device is connected with the current output end of the power battery, and the second end of the insulation monitoring device is connected with the current input end of the power battery;
the detection control device is respectively connected with the electric vehicle high-voltage system circuit and the insulation monitoring device and is used for detecting the insulation resistance value of each key high-voltage component and/or conventional high-voltage component of the electric vehicle high-voltage system circuit through the insulation monitoring device and determining the insulation fault of each key high-voltage component and/or conventional high-voltage component in the electric vehicle high-voltage system circuit;
the detection control device is also used for determining the insulation fault detection of each key high-voltage component and the conventional high-voltage component through on-off control of each key relay pair and on-off control of the conventional relay pair.
2. The circuit of claim 1,
a first end of a first main relay in the main relay pair is connected with a first end of the insulation detection device, and a second end of the first main relay is respectively connected with a first end of a first key relay in each key relay pair and a first end of a first conventional relay in the conventional relay pair;
the second end of each first key relay is respectively connected with the current input end of the corresponding key high-voltage component, and the second end of each first conventional relay is respectively connected with the current input end of each conventional high-voltage component;
the current output end of each key high-voltage component is respectively connected with the first end of a second key relay in the corresponding key relay pair, and the current output end of each conventional high-voltage component is respectively connected with the first end of a second conventional relay in the conventional relay pair;
the second end of each second key relay and the second end of the second conventional relay are respectively connected with the first end of the second main relay in the main relay pair;
and the second end of the second main relay is connected with the second end of the insulation detection device.
3. A method for detecting insulation failure of a component, which is applied to a detection control device in the circuit of claim 1 or 2, the method comprising:
controlling to disconnect each key relay pair and the conventional relay pair;
acquiring a first insulation resistance value corresponding to the power battery monitored by the insulation monitoring device after each key relay pair and the conventional relay pair are disconnected;
and when the first insulation resistance value is smaller than or equal to a set insulation failure value, determining the power battery as an insulation failure component, and recording the first insulation resistance value.
4. The method of claim 3, further comprising:
when the first insulation resistance value is larger than the set insulation failure value, selecting a current relay pair to be closed from unselected key relay pairs or the conventional relay pair;
determining a target high-voltage component associated with the current relay pair to be closed, and controlling the current relay pair to be closed;
acquiring a second insulation resistance value corresponding to the target high-voltage component monitored by the insulation monitoring device after the current relay pair to be closed is closed;
and determining the insulation detection result of the target high-voltage component according to the comparison between the second insulation resistance value and the set insulation failure value.
5. The method according to claim 4, wherein the determining the insulation detection result of the target high voltage component based on the comparison of the second insulation resistance value with the set insulation failure value comprises:
if the current relay pair to be closed is a key relay pair, when the second insulation resistance value is smaller than or equal to the set insulation failure value, determining that the target high-voltage component is an insulation failure component according to the insulation detection result;
if the current relay pair to be closed is a conventional relay pair, determining that an insulation failure component exists in each conventional high-voltage component when the second insulation resistance value is smaller than or equal to the set insulation failure value;
and recording the insulation resistance currently corresponding to the insulation failure component.
6. The method according to claim 4, further comprising, after determining the insulation detection result of the target high voltage component:
when the insulation detection result shows that the target high-voltage component is an insulation failure component, disconnecting the current relay pair to be closed, taking other unselected key relay pairs or conventional relay pairs as candidate relay pairs, and controlling to close the candidate relay pairs;
acquiring candidate insulation resistance values of the candidate relays corresponding to the associated high-voltage components, which are monitored by the insulation monitoring device;
if the candidate insulation resistance value is less than or equal to the set insulation failure value, disconnecting each candidate relay pair and returning to continuously execute the selected operation of the current relay pair to be closed; otherwise, ending the insulation fault detection.
7. The method according to claim 4, further comprising, after determining the insulation detection result of the target high voltage component:
and when the insulation detection result shows that the target high-voltage component is not an insulation failure component, controlling the current relay pair to be closed to be in a closed state, and returning to continue to execute the selected operation of the current relay pair to be closed until all key relay pairs or conventional relay pairs are selected.
8. The method of any one of claims 1-7, further comprising:
and carrying out insulation failure treatment on the insulation failure component detected from the electric vehicle high-voltage system circuit.
9. The method of claim 8, wherein the insulation failure processing of the insulation failure component detected from the electric vehicle high voltage system circuit comprises:
aiming at a key high-voltage failure component serving as an insulation failure component in the electric vehicle high-voltage system circuit, performing acousto-optic alarm, and forbidding high-voltage charging and charging operations;
and performing insulation failure alarm aiming at the conventional high-voltage failure component serving as the insulation failure component in the electric vehicle high-voltage system circuit.
10. A vehicle, characterized in that the vehicle comprises:
the high-voltage system circuit of the electric vehicle comprises a power battery, a main relay pair, at least one key high-voltage component, a key relay pair which is connected with each key high-voltage component in a one-to-one corresponding mode, at least one conventional high-voltage component and a conventional relay pair which is connected with each conventional high-voltage component;
the insulation monitoring device is connected with a high-voltage system circuit of the electric vehicle and used for monitoring the insulation resistance of the power battery, each key high-voltage component and each conventional high-voltage component;
a memory for storing executable instructions;
a controller for implementing the insulation fault detection method of any one of claims 3-9 when executing executable instructions stored in the memory.
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