CN109212385B - Whole vehicle circuit insulation detection method and device of electric vehicle - Google Patents
Whole vehicle circuit insulation detection method and device of electric vehicle Download PDFInfo
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- CN109212385B CN109212385B CN201710516239.8A CN201710516239A CN109212385B CN 109212385 B CN109212385 B CN 109212385B CN 201710516239 A CN201710516239 A CN 201710516239A CN 109212385 B CN109212385 B CN 109212385B
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- 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
- G01R31/1227—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 of components, parts or materials
- G01R31/1263—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
Abstract
The disclosure provides a whole vehicle circuit insulation detection method and device of an electric vehicle, and aims to solve the problem of potential safety hazard in the insulation detection process of the electric vehicle in the related art. The whole vehicle circuit comprises a power battery, a first insulation detection module, a second insulation detection module, a main positive relay, a main negative relay and a load circuit; the method comprises the following steps: detecting the resistance value of a first equivalent resistor of the power battery anode to the ground under the condition that the main positive relay and the second detection relay are closed; detecting the resistance value of a second equivalent resistor of the power battery negative pole to the ground under the condition that the main negative relay and the first detection relay are closed; and judging whether the whole vehicle circuit has an insulation fault according to the resistance values of the first equivalent resistor and the second equivalent resistor.
Description
Technical Field
The disclosure relates to the field of vehicle engineering, in particular to a method and a device for detecting insulation of a whole vehicle circuit of an electric vehicle.
Background
A motor controller, a power battery, an electric compressor, and the like in an electric vehicle are high-voltage components that need to operate in a high-voltage state. The working environment of the electric automobile is complex, and the insulation performance of the whole automobile circuit is reduced due to the aging of vibration, temperature, humidity, parts and the like, so that insulation faults occur. The positive and negative poles of the power battery and the chassis form a current loop through the insulating layer, when the insulating property of the whole vehicle circuit is reduced, the leakage current is increased, and when the leakage current reaches a certain value, the safety of passengers and the normal operation of the whole vehicle electrical system are endangered. Therefore, whether the whole vehicle circuit of the electric vehicle has insulation faults or not is detected, the vehicle is ensured to run in an insulation state, and the method has important significance for ensuring the personal safety of passengers, the normal work of electrical equipment and the safe running of the vehicle.
In the related art, when an electric automobile is in a low-voltage power-on state, whether insulation faults of earth leakage exist at two poles of a power battery or not is detected. And under the condition that the two poles of the unpowered battery are determined to be free of electric leakage, the main positive relay and the main negative relay are closed, so that the load circuit is connected with high-voltage electricity to form a high-voltage loop, and the electric automobile enters a high-voltage electrifying state. It is worth noting that both the positive and negative parts of the high voltage circuit create a capacitive effect on the ground. At this time, if it is required to detect whether there is an insulation fault in the high-voltage circuit, it is required to wait for about 10 seconds to complete charging of the equivalent capacitor formed by the capacitive effect, and after the voltage of each part of the circuit is stabilized, it is required to successively detect whether there is an insulation fault in each part of the high-voltage circuit. And if the high-voltage loop is detected to be faulty, completing the operations of high-voltage reduction, line maintenance and the like. It should be noted that if there is an insulation fault in the high-voltage circuit, in a detection period for detecting whether there is an insulation fault in the high-voltage circuit, high-voltage leakage may cause a safety hazard to passengers and electrical equipment in the vehicle.
Disclosure of Invention
The disclosure provides a whole vehicle circuit insulation detection method and device of an electric vehicle, and aims to solve the problem of potential safety hazard in the insulation detection process of the electric vehicle in the related art.
In order to achieve the above object, a first aspect of the present disclosure provides a method for detecting insulation of a whole vehicle circuit of an electric vehicle, where the whole vehicle circuit includes a power battery, a first insulation detection module, a second insulation detection module, a main positive relay, a main negative relay, and a load circuit;
the first end of the first insulation detection module is connected with the positive electrode of the power battery, the second end of the first insulation detection module is grounded, and the first insulation detection module comprises a first detection relay;
the first end of the second insulation detection module is connected with the negative electrode of the power battery, the second end of the second insulation detection module is grounded, and the second insulation detection module comprises a second detection relay;
the first end of the main positive relay is connected with the positive electrode of the power battery, and the second end of the main positive relay is connected with the first end of the load circuit;
the first end of the main negative relay is connected with the negative electrode of the power battery, and the second end of the main negative relay is connected with the second end of the load circuit;
the circuit between the positive electrode of the power battery and the second end of the load circuit is a positive electrode circuit; a circuit between the negative electrode of the power battery and the first end of the load circuit is a negative electrode circuit;
the method comprises performing the following insulation detection operations:
controlling the main positive relay and the second detection relay to be closed, the main negative relay and the first detection relay to be disconnected, detecting the resistance value of a first equivalent resistor of the power battery anode to the ground, and judging whether the anode line has an insulation fault according to the resistance value of the first equivalent resistor; and/or the presence of a gas in the gas,
and controlling the main negative relay and the first detection relay to be closed, disconnecting the main positive relay and the second detection relay, detecting the resistance value of a second equivalent resistor of the power battery negative pole to the ground, and judging whether the negative pole line has an insulation fault or not according to the resistance value of the second equivalent resistor.
Optionally, the method further comprises:
if the positive electrode circuit and the negative electrode circuit are not in insulation fault, controlling an acousto-optic system of the electric automobile to switch to a target working mode so as to prompt a driver to execute operation of enabling the electric automobile to enter a high-voltage power-on state;
and if an operation instruction for enabling the electric automobile to enter a high-voltage power-on state is detected, the main positive relay and the main negative relay are controlled to be closed, so that the load circuit is connected with high voltage electricity.
Optionally, after the load circuit is connected to the high voltage power supply, the method further includes:
controlling the first detection relay to be closed, and the second detection relay to be opened so as to form a first high-voltage loop, detecting the resistance value of a third equivalent resistor of the power battery anode to the ground, and judging whether the first high-voltage loop has an insulation fault according to the resistance value of the third equivalent resistor; and/or the presence of a gas in the gas,
and controlling the second detection relay to be closed, and the first detection relay to be opened so as to form a second high-voltage loop, detecting the resistance value of a fourth equivalent resistor of the negative electrode of the power battery to the ground, and judging whether the second high-voltage loop has an insulation fault or not according to the resistance value of the fourth equivalent resistor.
Optionally, the electric vehicle is provided with a vehicle key, and before performing the insulation detection operation, the method further comprises:
when a starting request sent by the vehicle key is received, controlling the electric vehicle to enter a low-voltage power-on state according to the starting request; and/or the presence of a gas in the gas,
and controlling the electric automobile to enter a low-voltage power-on state when the fact that the automobile key enters the preset range around the electric automobile is determined.
Optionally, the method further comprises:
and if the positive electrode circuit and/or the negative electrode circuit has an insulation fault, prohibiting the electric automobile from entering a high-voltage electrifying state.
The second aspect of the present disclosure provides a whole vehicle circuit insulation detection device of an electric vehicle, wherein the whole vehicle circuit comprises a power battery, a first insulation detection module, a second insulation detection module, a main positive relay, a main negative relay and a load circuit;
the first end of the first insulation detection module is connected with the positive electrode of the power battery, the second end of the first insulation detection module is grounded, and the first insulation detection module comprises a first detection relay;
the first end of the second insulation detection module is connected with the negative electrode of the power battery, the second end of the second insulation detection module is grounded, and the second insulation detection module comprises a second detection relay;
the first end of the main positive relay is connected with the positive electrode of the power battery, and the second end of the main positive relay is connected with the first end of the load circuit;
the first end of the main negative relay is connected with the negative electrode of the power battery, and the second end of the main negative relay is connected with the second end of the load circuit;
the circuit between the positive electrode of the power battery and the second end of the load circuit is a positive electrode circuit; a circuit between the negative electrode of the power battery and the first end of the load circuit is a negative electrode circuit;
the apparatus includes means for performing:
the first control module is used for controlling the main positive relay and the second detection relay to be closed, and the main negative relay and the first detection relay to be opened; the first resistance value detection module is used for detecting the resistance value of a first equivalent resistor of the power battery anode to the ground; the first judgment module is used for judging whether the positive line has an insulation fault according to the resistance value of the first equivalent resistor; and/or the presence of a gas in the gas,
the second control module is used for controlling the main negative relay and the first detection relay to be closed, and the main positive relay and the second detection relay to be opened; the second resistance value detection module is used for detecting the resistance value of a second equivalent resistor of the power battery negative pole to the ground; and the second judgment module is used for judging whether the negative line has an insulation fault according to the resistance value of the second equivalent resistor. Optionally, the apparatus further comprises:
the acousto-optic control module is used for controlling an acousto-optic system of the electric automobile to be switched to a target working mode when the positive electrode circuit and the negative electrode circuit are not subjected to insulation faults so as to prompt a driver to execute operation of enabling the electric automobile to enter a high-voltage power-on state;
and the high-voltage control module is used for controlling the main positive relay and the main negative relay to be closed when an operation instruction for enabling the electric automobile to enter a high-voltage power-on state is detected, so that the load circuit is connected with high voltage electricity.
Optionally, the apparatus further comprises:
the third control module is used for controlling the first detection relay to be closed and the second detection relay to be opened after the load circuit is connected with high-voltage electricity so as to form a first high-voltage loop; the third resistance value detection module is used for detecting the resistance value of a third equivalent resistor of the power battery anode to the ground; the third judging module is used for judging whether the first high-voltage loop has an insulation fault according to the resistance value of the third equivalent resistor; and/or the presence of a gas in the gas,
the fourth control module is used for controlling the second detection relay to be closed and the first detection relay to be opened after the high-voltage power is switched on in the load circuit so as to form a second high-voltage loop; the fourth resistance value detection module is used for detecting the resistance value of a fourth equivalent resistor of the negative electrode of the power battery to the ground; and the fourth judging module is used for judging whether the second high-voltage loop has insulation faults or not according to the resistance value of the fourth equivalent resistor.
Optionally, the electric vehicle is provided with a vehicle key, and the device further comprises:
the first low-voltage control module is used for controlling the electric automobile to enter a low-voltage electrifying state according to a starting request sent by the automobile key when the starting request is received; and/or the presence of a gas in the gas,
and the second low-voltage control module is used for controlling the electric automobile to enter a low-voltage power-on state when the fact that the automobile key enters the preset range around the electric automobile is determined.
Optionally, the apparatus further comprises:
and the fault processing module is used for forbidding the electric automobile to enter a high-voltage electrifying state when the anode line and/or the cathode line has an insulation fault.
A third aspect of the present disclosure provides a computer-readable storage medium, on which a computer program is stored, where the program is executed by a processor to perform the steps of the method for detecting insulation of the whole vehicle circuit of the electric vehicle in the above mentioned aspect and the optional embodiments of the first aspect.
The fourth aspect of the present disclosure provides an entire vehicle circuit insulation detection device for an electric vehicle, the device including: the computer-readable storage medium recited in the third aspect; and one or more processors for executing the program in the computer-readable storage medium.
According to the technical scheme, the main positive relay and the second detection relay are closed or the main negative relay and the first detection relay are closed to enable the single end of the load circuit to be connected into the power battery, and then the resistance of the equivalent resistance of the positive electrode and the negative electrode of the power battery to the ground is detected respectively, so that the two ends of the load circuit are connected into the power battery simultaneously to enable the electric automobile to be in a high-voltage power-on state and then can pass through the resistance of the equivalent resistance respectively to judge whether insulation faults exist in the positive electrode circuit and the negative electrode circuit of the whole automobile circuit comprising the load circuit.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a circuit diagram of a complete vehicle circuit of an electric vehicle
Fig. 2 is a flowchart illustrating a method for detecting insulation of a whole vehicle circuit of an electric vehicle according to an exemplary embodiment.
Fig. 3 is a flowchart illustrating another method for detecting insulation of a whole vehicle circuit of an electric vehicle according to an exemplary embodiment.
Fig. 4 is a block diagram illustrating a complete vehicle circuit insulation detection apparatus of an electric vehicle according to an exemplary embodiment.
Fig. 5 is a block diagram of an entire vehicle circuit insulation detection apparatus of another electric vehicle according to an exemplary embodiment.
Fig. 6 is a block diagram illustrating a whole vehicle circuit insulation detection apparatus of another electric vehicle according to an exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a circuit diagram of a whole vehicle circuit of an electric vehicle. As shown in fig. 1, the vehicle-finishing circuit 10 includes a power battery 100, a first insulation detection module 110, a second insulation detection module 120, a main positive relay 130, a main negative relay 140, and a load circuit 150.
The first end of the first insulation detection module 110 is connected with the positive pole of the power battery 100, the second end of the first insulation detection module 110 is grounded, and the first insulation detection module 110 comprises a first detection relay K1.
The first end of the second insulation detection module 120 is connected to the negative electrode of the power battery 100, the second end of the second insulation detection module 120 is grounded, and the second insulation detection module 120 includes a second detection relay K2.
A first end of the main positive relay 130 is connected to the positive electrode of the power battery 100, and a second end of the main positive relay 130 is connected to a first end of the load circuit 150. As shown in the dotted line in fig. 1, the main positive relay 130 may further include a pre-charge resistor structure.
A first end of the main negative relay 140 is connected to the negative electrode of the power battery 100, and a second end of the main negative relay 140 is connected to a second end of the load circuit 150.
In the related art, the insulation detection operation in the low-voltage power-on state is performed on the entire vehicle circuit 10, and the specific operation is as follows.
After the vehicle is in a low-voltage power-ON state, that is, after the vehicle is in an ON gear power-ON state, the first insulation detection module 110 and the second insulation detection module 120 start to intervene in insulation detection.
When the first detection relay K1 is closed and the second detection relay K2 is opened, the resistance value of the first equivalent resistor of the positive electrode of the power battery 100 to the ground, namely the resistance value of the first equivalent resistor R1 shown by a dotted line in fig. 1, is detected, and whether the positive electrode of the power battery 100 has an insulation fault is judged according to the resistance value.
Similarly, when the second detection relay K2 is closed and the first detection relay K1 is open, the resistance of the second equivalent resistor of the negative electrode of the power battery 100 to the ground, that is, the resistance of the second equivalent resistor R2 shown by a dotted line in fig. 1, is detected, and whether the insulation fault occurs in the negative electrode of the power battery 100 is determined according to the resistance.
Whether insulation faults occur on the positive and negative electrodes of the power battery 100 can only be detected through the insulation detection operation. If no fault is detected, after receiving a high-voltage power-on command, performing insulation detection on the whole vehicle circuit 10 in a high-voltage power-on state, specifically operating as follows.
The main positive relay 130 and the main negative relay 140 are closed, and the load circuit 150 is connected with high voltage electricity to form a current loop of the whole vehicle circuit 10. It is noted that, as shown by the dotted line portion in fig. 1, the positive electrode portion and the negative electrode portion of the circuit form an equivalent capacitance C1 and an equivalent capacitance C2, respectively. Before further detecting whether the insulation fault occurs in the whole loop, the waiting time is about 10s, after the equivalent capacitor is charged and the voltage of each part of the whole vehicle circuit 10 is stabilized, the first detection relay K1 and the second electrical measurement relay K2 are closed in turn to detect whether the insulation fault occurs in the positive electrode part and the negative electrode part.
It should be noted that if the circuit has an insulation fault, in the insulation detection process when the entire vehicle circuit 10 is in the high-voltage power-on state, the high-voltage leakage may cause potential safety hazards to passengers and electrical equipment in the vehicle. In contrast, the embodiment of the present disclosure provides a method for detecting insulation of a whole vehicle circuit of an electric vehicle, where before the whole vehicle circuit 10 enters a high-voltage power-on state, insulation detection is performed on each part of the whole vehicle circuit 10, so as to eliminate an insulation fault and reduce a risk of high-voltage leakage in an insulation detection process.
Wherein, the circuit between the positive electrode of the power battery 100 and the second end of the load circuit 150 is a positive electrode line; the circuit between the negative electrode of the power battery 100 and the first end of the load circuit 150 is a negative electrode line. As shown in fig. 2, the method includes performing the following insulation detection operations:
step S21, the main positive relay 130 and the second detection relay K2 are controlled to be closed, and the main negative relay 140 and the first detection relay K1 are controlled to be opened.
In step S22, the resistance of the first equivalent resistor R1 of the power battery 100 positive electrode to ground is detected.
Optionally, the detecting the resistance value of the first equivalent resistor R1 of the power battery 100 from the positive electrode to the ground includes: the resistance value of the first equivalent resistor R1 of the power battery 100 from the positive electrode to the ground is detected by a terminal voltage method.
Specifically, the second insulation detecting module 120 includes a standard resistor. The second test relay K2 in the second insulation test module 120 is closed, i.e. the reference resistor is connected into the circuit. Since the resistance value of the first equivalent resistor R1 is in direct proportion to the voltage value of the positive electrode of the power battery 100 to the ground, during specific detection, the voltage values of the positive electrode and the negative electrode of the power battery 100 to the ground before and after the connection to the standard resistor are detected respectively, and the resistance value of the first equivalent resistor R1 can be obtained according to the voltage division relationship between the first equivalent resistor and the standard resistor.
And step S23, judging whether the anode line has insulation fault according to the resistance value of the first equivalent resistor R1.
Specifically, when the electric vehicle is factory set, the resistance value of the first equivalent resistor R1 may be detected under the condition that the entire vehicle is insulated and has no fault, and the result is used as a reference value, so as to obtain a reasonable resistance value range of the equivalent resistor, so that in step S23, if the resistance value of the first equivalent resistor R1 is not within the reasonable resistance value range, it may be determined that the positive line has a fault. In another possible implementation manner, the electric vehicle may simulate various insulation faults in factory settings, and detect the resistance value corresponding to the equivalent resistor under different insulation fault conditions, so as to obtain a judgment range of the insulation fault, that is, in step S23, if the resistance value of the first equivalent resistor R1 is within the judgment range, it is determined that the positive line has a fault.
Further, the embodiment of the disclosure may further perform fault processing and prohibit the electric vehicle from entering a high-voltage power-on state when the positive line has an insulation fault. In addition, under the condition that the insulation fault does not occur in the positive line, a detection step for a negative line can be further performed, wherein the main negative relay 140 and the first detection relay K1 are controlled to be closed, the main positive relay 130 and the second detection relay K2 are controlled to be opened, the resistance value of a second equivalent resistor R2 of the negative pole of the power battery 100 to the ground is detected, and whether the insulation fault occurs in the positive line or not is judged according to the resistance value of the second equivalent resistor R2. The specific reference to the above description of step S22 is to detect the resistance of the second equivalent resistor R2 of the negative electrode of the power battery 100 to the ground; the specific reference to the above description of step S23 may be used to determine whether the insulation fault occurs in the negative line according to the resistance of the second equivalent resistor R2, and details thereof are not repeated here.
Above-mentioned technical scheme, control main positive relay 130 with second detection relay K2 is closed, perhaps, control main negative relay 140 with first detection relay K1 is closed, makes load circuit 150 single-ended access power battery 100 detects respectively again power battery 100 is just, the resistance to the ground of the equivalent resistance of negative pole, like this, will load circuit 150 both ends access power battery 100 simultaneously, make whole car circuit 10 is in before the high-pressure power-on state, can judge respectively whether there is insulation fault in the positive, negative pole circuit of whole car circuit 10 including load circuit 150.
It should be noted that, the detection of the positive line or the detection of the negative line is the detection of a single-sided line, the order of the detection does not affect the final detection result, and in specific implementation, the execution order of the steps may be adjusted according to actual conditions, which is not limited in this disclosure.
In a possible implementation scenario, the method may be a step of performing the insulation detection operation after detecting a start instruction of a driver and controlling the electric vehicle to enter a low-voltage power-on state according to the start instruction. Referring to step S21, after the main positive relay 130 and the second detection relay K2 are closed, the positive line has a capacitance effect to ground, and to obtain a reasonable detection result, it is required to wait for the equivalent capacitance generated by the capacitance effect to be charged, and then the voltage of each part of the positive line is stabilized, and then the resistance value of the first equivalent resistor R1 is detected. This process takes approximately 10 s. Similarly, the time required to complete the insulation fault detection step for the negative electrode line is also approximately 10 seconds. Therefore, 20s of time is required to complete the above operation steps of the embodiment of the present disclosure. During this time, the driver waits for the test result. An alternative embodiment is proposed below to save the waiting time of the driver.
Optionally, the electric vehicle is provided with a vehicle key, and before the insulation detection operation is performed, the method further comprises: when a starting request sent by the vehicle key is received, controlling the electric vehicle to enter a low-voltage power-on state according to the starting request; and/or controlling the electric automobile to enter a low-voltage power-on state when the automobile key is determined to enter a preset range around the electric automobile.
Thus, before the driver enters the vehicle, the electric vehicle can enter low-voltage power-on in advance, and the insulation detection operation on the whole vehicle circuit 10 is executed. The time that the electric automobile enters low-voltage power-on in advance can be adjusted by adjusting the size of the preset range. For example, the preset range is adjusted to 50m, and after a user enters the range with a car key, the insulation detection operation is started, so that the waiting time of the user in the car is shortened.
In order to make those skilled in the art understand the technical solution provided by the embodiment of the present disclosure, a detailed example of the method for detecting insulation of a complete vehicle circuit of an electric vehicle provided by the embodiment of the present disclosure is described below, as shown in fig. 3, the method includes:
fig. 3 is a flowchart illustrating a method for detecting insulation of a whole vehicle circuit of an electric vehicle according to an exemplary embodiment. As shown in fig. 3, the method includes:
and step S31, controlling the main positive relay 130 and the second detection relay K2 to be closed, the main negative relay 140 and the first detection relay K1 to be disconnected, detecting the resistance value of a first equivalent resistor R1 of the power battery 100 positive electrode to the ground, and judging whether the positive electrode line has an insulation fault according to the resistance value of the first equivalent resistor R1.
Further, if no insulation fault occurs in the positive electrode line, step S32 is executed; if the positive line has no insulation fault, step S33 is executed.
And step S32, controlling the main negative relay 140 and the first detection relay K1 to be closed, disconnecting the main positive relay 130 and the second detection relay K2, detecting the resistance value of a second equivalent resistor R2 of the power battery 100, and judging whether the negative line has an insulation fault according to the resistance value of the second equivalent resistor R2.
Further, if the insulation fault does not occur in the negative electrode line, performing steps S34 to S36; if the negative electrode line has an insulation fault, step S33 is executed.
And step S33, performing fault processing and prohibiting the electric automobile from entering a high-voltage power-on state.
And step S34, controlling an acousto-optic system of the electric automobile to switch to a target working mode so as to prompt a driver to execute the operation of enabling the electric automobile to enter a high-voltage power-on state.
In a possible implementation scenario, the indicator light is always in a yellow light state in the insulation detection process, and if the insulation fault is detected, the indicator light is changed into a red light to prompt a driver that the vehicle has the insulation fault. And meanwhile, voice broadcasting is carried out, passengers in the vehicle are indicated to leave, and fault codes are broadcasted, so that a driver can conveniently carry out related fault maintenance operation. At this time, if the driver continues to perform the vehicle starting operation, the warning twinkles the light to warn the driver, and the electric vehicle cannot enter a high-voltage power-on state due to the insulation fault of the whole vehicle circuit 10.
In some vehicles, the operation may be the driver twisting the key of the vehicle, for example, entering the starting gear from the "ON gear", or pressing a button for starting the electric vehicle. In one possible implementation, the vehicle control unit may generate an operation instruction for causing the electric vehicle to enter the high-voltage power-on state according to the operation signal.
Step S35, if an operation instruction for making the electric vehicle enter a high-voltage power-on state is detected, controlling the main positive relay 130 and the main negative relay 140 to close, so that the load circuit 150 is switched on.
And step S36, controlling the first detection relay K1 to be closed and the second detection relay K2 to be opened so as to form a first high-voltage loop, detecting the resistance value of a third equivalent resistor of the power battery 100 from the positive pole to the ground, and judging whether the first high-voltage loop has an insulation fault or not according to the resistance value of the third equivalent resistor.
Further, if the first high-voltage circuit has no insulation fault, executing step S37; if the first high-voltage loop has an insulation fault, step S38 is executed.
And step S37, controlling the second detection relay K2 to be closed, and the first detection relay K1 to be opened so as to form a second high-voltage loop, detecting the resistance value of a fourth equivalent resistor of the negative electrode of the power battery 100 to the ground, and judging whether the second high-voltage loop has an insulation fault or not according to the resistance value of the fourth equivalent resistor.
Further, if no insulation fault occurs in the second high-voltage circuit, step S39 is executed; if the second high-voltage circuit has an insulation fault, step S38 is executed.
And step S38, performing high-voltage operation on the whole vehicle circuit 10, and performing fault treatment.
Specifically, the step S38 may include disconnecting the main positive relay 130 and the main negative relay 140, and reporting a corresponding insulation fault code.
In step S39, the insulation detection result of the vehicle circuit 10 is output.
Further, the insulation detection result can be stored, so that a maintainer can conveniently check the historical detection result when the electric automobile is overhauled.
It should be noted that, for the sake of simplicity, the above method embodiments are all described as a series of action combinations, but those skilled in the art should understand that the disclosure is not limited by the described action sequence, for example, the insulation fault detection may be performed on the negative electrode line first, and then the insulation fault detection may be performed on the positive electrode line. Secondly, it should be understood by those skilled in the art that the embodiments described in the specification all belong to the preferred embodiments, and the related actions are not necessarily required by the present disclosure, for example, the steps S36 to S38 may further ensure that the insulation performance of the entire vehicle circuit 10 is good, reduce the potential safety hazard during the insulation detection process of the electric vehicle, and may also be selected not to be executed in the specific implementation.
Based on the same inventive concept, the embodiment of the present disclosure further provides a device 400 for detecting insulation of a whole vehicle circuit of an electric vehicle, wherein the whole vehicle circuit refers to the whole vehicle circuit 10 described in fig. 1, and details thereof are not repeated herein. The apparatus 400 is used for implementing the method steps provided by the above method embodiments, as shown in fig. 4, the apparatus 400 includes:
a first control module 411 for controlling the main positive relay 130 and the second detection relay K2 to be closed and the main negative relay 140 and the first detection relay K1 to be open; the first resistance value detection module 412 is configured to detect a resistance value of a first equivalent resistor R1 of the power battery 100 from the positive electrode to the ground; the first judging module 413 is configured to judge whether the positive line has an insulation fault according to the resistance of the first equivalent resistor R1;
and/or, as indicated in phantom in fig. 4, the apparatus 400 includes the following modules:
a second control module 421 for controlling the main negative relay 140 and the first detection relay K1 to be closed, and the main positive relay 130 and the second detection relay K2 to be opened; the second resistance detection module 422 is used for detecting the resistance of a second equivalent resistor R2 of the power battery 100 with the negative pole facing the ground; the third judging module 423 is configured to judge whether the negative line has an insulation fault according to the resistance of the second equivalent resistor R2.
The above-mentioned device that this disclosed embodiment provided can control main positive relay 130 with second detection relay K2 is closed, perhaps, control main negative relay 140 with first detection relay K1 is closed, makes load circuit 150 single-ended access power battery 100, detects respectively again power battery 100 is just, the resistance of the equivalent resistance to ground of negative pole, like this, will load circuit 150 both ends access power battery 100 simultaneously, make whole car circuit 10 is in before the high-pressure power-on state, can judge respectively whether there is insulation fault in the positive, negative pole circuit of whole car circuit 10 including load circuit 150.
Optionally, on the basis of the apparatus 400 shown in fig. 4, as shown in fig. 5, the apparatus 400 further includes: the acousto-optic control module 450 is configured to control an acousto-optic system of the electric vehicle to switch to a target working mode when no insulation fault occurs in the positive electrode line or the negative electrode line, so as to prompt a driver to perform an operation of enabling the electric vehicle to enter a high-voltage power-on state; and a high voltage control module 460, configured to control the main positive relay 130 and the main negative relay 140 to be closed when an operation instruction for making the electric vehicle enter a high voltage power-on state is detected, so as to make the load circuit 150 switch in a high voltage.
Optionally, on the basis of fig. 4, as shown in fig. 5, the apparatus 400 further includes:
the third control module 431 is used for controlling the first detection relay K1 to be closed and the second detection relay K2 to be opened after the load circuit 150 is connected with high voltage electricity so as to form a first high-voltage loop; a third resistance value detection module 432, configured to detect a resistance value of a third equivalent resistor of the positive electrode of the power battery 100 to the ground; a third judging module 433, configured to judge whether an insulation fault occurs in the first high-voltage loop according to a resistance value of the third equivalent resistor;
and/or, as indicated in phantom in fig. 5, the apparatus 400 includes the following modules:
the fourth control module 441 is used for controlling the second detection relay K2 to be closed and the first detection relay K1 to be opened after the high-voltage power is connected to the load circuit 150, so as to form a second high-voltage loop; a fourth resistance value detection module 442, configured to detect a resistance value of a fourth equivalent resistor of the negative electrode of the power battery 100 to the ground; and a fourth determining module 443, configured to determine whether an insulation fault occurs in the second high-voltage circuit according to a resistance value of the fourth equivalent resistor. Therefore, the insulation fault detection operation is carried out after the electric automobile enters the high-voltage electrifying state, so that the insulation performance of the whole automobile circuit 10 is further ensured to be good, and the driving safety is ensured.
Optionally, the electric vehicle is equipped with a vehicle key, and on the basis of the apparatus shown in fig. 4, as shown in fig. 5, the apparatus 400 further includes: the first low-voltage control module 471 is configured to, when receiving a start request sent by the vehicle key, control the electric vehicle to enter a low-voltage power-on state according to the start request;
and/or, as shown in phantom in fig. 5, the apparatus 400 includes: the second low voltage control module 472 is configured to control the electric vehicle to enter a low voltage power-on state when it is determined that the vehicle key enters the preset range around the electric vehicle. In this way, before the driver enters the vehicle, the electric vehicle can be brought into a low-voltage power-on state in advance, and the insulation detection operation on the whole vehicle circuit 10 can be executed. In specific implementation, the time for the electric automobile to enter low-voltage power-on in advance can be adjusted by adjusting the size of the preset range. For example, the preset range is adjusted to 50m, and the insulation detection operation is started after a user enters the range with a car key, so that the waiting time of the user in the car is reduced.
Optionally, on the basis of the apparatus shown in fig. 4, as shown in fig. 5, the apparatus 400 further includes: and the fault processing module 480 is configured to prohibit the electric vehicle from entering a high-voltage power-on state when the positive line and/or the negative line has an insulation fault.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Fig. 6 is a block diagram illustrating a complete vehicle circuit insulation detection apparatus 600 of an electric vehicle according to an exemplary embodiment. As shown in fig. 6, the entire vehicle circuit insulation detection apparatus 600 of the electric vehicle may include: a processor 601, a memory 602, multimedia components 603, input/output (I/O) interfaces 604, and communication components 605.
The processor 601 is configured to control the overall operation of the entire vehicle circuit insulation detection apparatus 600 of the electric vehicle, so as to complete all or part of the steps in the entire vehicle circuit insulation detection method of the electric vehicle. The memory 602 is used for storing various types of data to support the operation of the whole vehicle circuit insulation detection device 600 of the electric vehicle, and the data may include, for example, instructions of any application program or method for operating on the whole vehicle circuit insulation detection device 600 of the electric vehicle, and application program-related data, such as resistance threshold information for determining whether an insulation fault occurs in the positive electrode line or the negative electrode line, a message transmitted and received, audio, and the like. The Memory 602 may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk or optical disk. The multimedia components 603 may include a screen and audio components. Wherein the screen may be, for example, a touch screen and the audio component is used for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may further be stored in the memory 602 or transmitted through the communication component 605. The audio assembly also includes at least one speaker for outputting audio signals. The I/O interface 604 provides an interface between the processor 601 and other interface modules, such as a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 605 is used for performing wired or wireless communication between the whole vehicle circuit insulation detection device 600 of the electric vehicle and other devices. Wireless Communication, such as Wi-Fi, bluetooth, Near Field Communication (NFC), 2G, 3G, or 4G, or a combination of one or more of them, so that the corresponding Communication component 605 may include: Wi-Fi module, bluetooth module, NFC module.
In an exemplary embodiment, the entire vehicle Circuit insulation detection apparatus 600 of the electric vehicle may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components, and is used to perform the entire vehicle Circuit insulation detection method of the electric vehicle.
In another exemplary embodiment, a computer readable storage medium including program instructions, such as the memory 602 including program instructions, which can be executed by the processor 601 of the whole vehicle circuit insulation detection apparatus 600 of the electric vehicle to complete the whole vehicle circuit insulation detection method of the electric vehicle is also provided.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner to avoid unnecessary repetition, and the disclosure does not separately describe various possible combinations.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (12)
1. A whole vehicle circuit insulation detection method of an electric vehicle is disclosed, wherein the whole vehicle circuit comprises a power battery, a first insulation detection module, a second insulation detection module, a main positive relay, a main negative relay and a load circuit;
the first end of the first insulation detection module is connected with the positive electrode of the power battery, the second end of the first insulation detection module is grounded, and the first insulation detection module comprises a first detection relay;
the first end of the second insulation detection module is connected with the negative electrode of the power battery, the second end of the second insulation detection module is grounded, and the second insulation detection module comprises a second detection relay;
the first end of the main positive relay is connected with the positive electrode of the power battery, and the second end of the main positive relay is connected with the first end of the load circuit;
the first end of the main negative relay is connected with the negative electrode of the power battery, and the second end of the main negative relay is connected with the second end of the load circuit;
the circuit between the positive electrode of the power battery and the second end of the load circuit is a positive electrode circuit; a circuit between the negative electrode of the power battery and the first end of the load circuit is a negative electrode circuit;
characterized in that it comprises the following insulation detection operations:
controlling the main positive relay and the second detection relay to be closed, the main negative relay and the first detection relay to be disconnected, detecting the resistance value of a first equivalent resistor of the power battery anode to the ground, and judging whether the anode line has an insulation fault according to the resistance value of the first equivalent resistor; and/or the presence of a gas in the gas,
and controlling the main negative relay and the first detection relay to be closed, disconnecting the main positive relay and the second detection relay, detecting the resistance value of a second equivalent resistor of the power battery negative pole to the ground, and judging whether the negative pole line has an insulation fault or not according to the resistance value of the second equivalent resistor.
2. The method of claim 1, further comprising:
if the positive electrode circuit and the negative electrode circuit have no insulation fault, controlling an acousto-optic system of the electric automobile to switch to a target working mode so as to prompt a driver to execute an operation of enabling the electric automobile to enter a high-voltage power-on state;
and if an operation instruction for enabling the electric automobile to enter a high-voltage power-on state is detected, the main positive relay and the main negative relay are controlled to be closed, so that the load circuit is connected with high voltage electricity.
3. The method of claim 2, wherein after the load circuit is switched on with high voltage power, the method further comprises:
controlling the first detection relay to be closed, and the second detection relay to be opened so as to form a first high-voltage loop, detecting the resistance value of a third equivalent resistor of the power battery anode to the ground, and judging whether the first high-voltage loop has an insulation fault according to the resistance value of the third equivalent resistor; and/or the presence of a gas in the gas,
and controlling the second detection relay to be closed, and the first detection relay to be opened so as to form a second high-voltage loop, detecting the resistance value of a fourth equivalent resistor of the negative electrode of the power battery to the ground, and judging whether the second high-voltage loop has an insulation fault or not according to the resistance value of the fourth equivalent resistor.
4. The method according to any one of claims 1 to 3, wherein the electric vehicle is provided with a vehicle key, and before performing the insulation detection operation, the method further comprises:
when a starting request sent by the vehicle key is received, controlling the electric vehicle to enter a low-voltage power-on state according to the starting request; and/or the presence of a gas in the gas,
and controlling the electric automobile to enter a low-voltage power-on state when the fact that the automobile key enters the preset range around the electric automobile is determined.
5. The method of claim 1, further comprising:
and if the positive electrode circuit and/or the negative electrode circuit has an insulation fault, prohibiting the electric automobile from entering a high-voltage electrifying state.
6. A whole vehicle circuit insulation detection device of an electric vehicle comprises a power battery, a first insulation detection module, a second insulation detection module, a main positive relay, a main negative relay and a load circuit;
the first end of the first insulation detection module is connected with the positive electrode of the power battery, the second end of the first insulation detection module is grounded, and the first insulation detection module comprises a first detection relay;
the first end of the second insulation detection module is connected with the negative electrode of the power battery, the second end of the second insulation detection module is grounded, and the second insulation detection module comprises a second detection relay;
the first end of the main positive relay is connected with the positive electrode of the power battery, and the second end of the main positive relay is connected with the first end of the load circuit;
the first end of the main negative relay is connected with the negative electrode of the power battery, and the second end of the main negative relay is connected with the second end of the load circuit;
the circuit between the positive electrode of the power battery and the second end of the load circuit is a positive electrode circuit; a circuit between the negative electrode of the power battery and the first end of the load circuit is a negative electrode circuit;
characterized in that the device comprises means for performing:
the first control module is used for controlling the main positive relay and the second detection relay to be closed, and the main negative relay and the first detection relay to be opened; the first resistance value detection module is used for detecting the resistance value of a first equivalent resistor of the power battery anode to the ground; the first judgment module is used for judging whether the positive line has an insulation fault according to the resistance value of the first equivalent resistor; and/or the presence of a gas in the gas,
the second control module is used for controlling the main negative relay and the first detection relay to be closed, and the main positive relay and the second detection relay to be opened; the second resistance value detection module is used for detecting the resistance value of a second equivalent resistor of the power battery negative pole to the ground; and the second judgment module is used for judging whether the negative line has an insulation fault according to the resistance value of the second equivalent resistor.
7. The apparatus of claim 6, further comprising:
the acousto-optic control module is used for controlling an acousto-optic system of the electric automobile to be switched to a target working mode when the positive electrode circuit and the negative electrode circuit are not subjected to insulation faults so as to prompt a driver to execute operation of enabling the electric automobile to enter a high-voltage power-on state;
and the high-voltage control module is used for controlling the main positive relay and the main negative relay to be closed when an operation instruction for enabling the electric automobile to enter a high-voltage power-on state is detected, so that the load circuit is connected with high voltage electricity.
8. The apparatus of claim 7, further comprising:
the third control module is used for controlling the first detection relay to be closed and the second detection relay to be opened after the load circuit is connected with high-voltage electricity so as to form a first high-voltage loop; the third resistance value detection module is used for detecting the resistance value of a third equivalent resistor of the power battery anode to the ground; the third judging module is used for judging whether the first high-voltage loop has an insulation fault according to the resistance value of the third equivalent resistor; and/or the presence of a gas in the gas,
the fourth control module is used for controlling the second detection relay to be closed and the first detection relay to be opened after the high-voltage power is switched on in the load circuit so as to form a second high-voltage loop; the fourth resistance value detection module is used for detecting the resistance value of a fourth equivalent resistor of the negative electrode of the power battery to the ground; and the fourth judging module is used for judging whether the second high-voltage loop has insulation faults or not according to the resistance value of the fourth equivalent resistor.
9. The apparatus of any one of claims 6 to 8, wherein the electric vehicle is provided with a vehicle key, the apparatus further comprising:
the first low-voltage control module is used for controlling the electric automobile to enter a low-voltage electrifying state according to a starting request sent by the automobile key when the starting request is received; and/or the presence of a gas in the gas,
and the second low-voltage control module is used for controlling the electric automobile to enter a low-voltage power-on state when the fact that the automobile key enters the preset range around the electric automobile is determined.
10. The apparatus of claim 6, further comprising:
and the fault processing module is used for forbidding the electric automobile to enter a high-voltage electrifying state when the anode line and/or the cathode line has an insulation fault.
11. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
12. The utility model provides an electric automobile's whole car circuit insulation detection device which characterized in that, the device includes:
the computer-readable storage medium recited in claim 11; and
one or more processors to execute the program in the computer-readable storage medium.
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| CN110967557B (en) * | 2019-02-25 | 2021-06-15 | 宁德时代新能源科技股份有限公司 | Detection circuit and method |
| CN110426556B (en) * | 2019-08-14 | 2021-12-07 | 江铃控股有限公司 | Method for testing insulation resistance of whole vehicle |
| CN112706627B (en) * | 2019-10-09 | 2022-10-14 | 北京新能源汽车股份有限公司 | Insulation detection circuit and method and electric automobile |
| CN111308376A (en) * | 2020-02-24 | 2020-06-19 | 上海蔚来汽车有限公司 | Power battery insulation monitoring method, system and device |
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| CN112578300A (en) * | 2020-11-30 | 2021-03-30 | 珠海格力电器股份有限公司 | Detection device and method for insulation resistance of power battery and automobile |
| CN114290951A (en) * | 2020-12-23 | 2022-04-08 | 华为数字能源技术有限公司 | Starting method and device of electric automobile |
| CN112731088A (en) * | 2020-12-25 | 2021-04-30 | 中国第一汽车股份有限公司 | Vehicle high-voltage circuit detection method and device, vehicle and storage medium |
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Denomination of invention: Complete vehicle circuit insulation detection method and device of electric vehicle Effective date of registration: 20211213 Granted publication date: 20201113 Pledgee: BEIJING AUTOMOTIVE GROUP Co.,Ltd. Pledgor: Borgward Automotive (China) Co., Ltd. Registration number: Y2021990001167 |
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Date of cancellation: 20231201 Granted publication date: 20201113 Pledgee: BEIJING AUTOMOTIVE GROUP Co.,Ltd. Pledgor: Beijing baowo Automobile Co.,Ltd.|Borgward Automotive (China) Co., Ltd. Registration number: Y2021990001167 |