CN111257742A - Fault diagnosis method and device for relay and vehicle - Google Patents
Fault diagnosis method and device for relay and vehicle Download PDFInfo
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- CN111257742A CN111257742A CN201811468580.1A CN201811468580A CN111257742A CN 111257742 A CN111257742 A CN 111257742A CN 201811468580 A CN201811468580 A CN 201811468580A CN 111257742 A CN111257742 A CN 111257742A
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
Abstract
The disclosure relates to a fault diagnosis method and device of a relay and a vehicle. The method comprises the following steps: acquiring a current power supply control instruction, wherein the current power supply control instruction is one of a plurality of power supply control instructions for a power battery; and carrying out fault diagnosis on a relay which needs to be operated when the current power supply control command is executed in a power supply line of the power battery. Therefore, fault diagnosis of the same relay can be carried out under the condition of acquiring different power supply control instructions, and the accuracy of fault diagnosis of the relay can be improved due to the diversification of conditions for triggering diagnosis, so that the safety of the whole vehicle is improved.
Description
Technical Field
The disclosure relates to the field of vehicle fault diagnosis, in particular to a fault diagnosis method and device of a relay and a vehicle.
Background
The positive pole of the power battery in the electric vehicle is connected with the load through a positive pole relay, the negative pole of the power battery is connected with the relay through a negative pole relay, and the positive pole of the power battery is also connected with the pre-charging resistor through a pre-charging relay.
In a battery management system of a power battery, the control of a relay is mainly used for ensuring the normal charging and discharging of the whole vehicle and monitoring the current, the voltage and the like in the pre-charging process. When a vehicle breaks down, the relay can be reliably disconnected to ensure the safety of the power battery and the whole vehicle, so that the relay control device has an important function.
Currently, fault diagnosis of a relay includes diagnosis of faults such as relay sticking.
Disclosure of Invention
The purpose of this disclosure is to provide a fault diagnosis method, device of quick, reliable relay, and provide a vehicle.
In order to achieve the above object, the present disclosure provides a fault diagnosis method of a relay. The method comprises the following steps: acquiring a current power supply control instruction, wherein the current power supply control instruction is one of a plurality of power supply control instructions for a power battery; and carrying out fault diagnosis on a relay which needs to be operated when the current power supply control command is executed in a power supply line of the power battery.
Optionally, the step of diagnosing the fault of the relay which needs to be operated to execute the current power supply control command in the power supply line of the power battery comprises: collecting voltages between a plurality of pairs of reference points in a power supply line of the power battery; judging the opening and closing state of each relay in the power supply line according to the voltage between the multiple pairs of reference points; and according to the opening and closing state of each relay and the current power supply control command, carrying out fault diagnosis on the relay which needs to be operated when the current power supply control command is executed in the power supply line of the power battery.
Optionally, after the step of determining the open/close state of each relay in the power supply line according to the voltage between the pairs of reference points, the step of performing fault diagnosis on the relay that needs to be operated to execute the current power supply control command in the power supply line of the power battery further includes:
and when the positive relay and the negative relay of the power battery are judged to be in the closed state, checking the judgment result of the closed state of the positive relay and the negative relay of the power battery according to the comparison result of the voltage at two ends of the power battery and the voltage at two ends of the load.
Optionally, the step of performing fault diagnosis on the relay which needs to be operated to execute the current power supply control command in the power supply line of the power battery according to the opening and closing state of each relay and the current power supply control command includes:
generating a relay state flag bit according to the opening and closing state of each relay;
and according to the relay state zone bit and the current power supply control command, carrying out fault diagnosis on the relay which needs to be operated when the current power supply control command is executed in a power supply line of the power battery.
Optionally, the plurality of power supply control instructions for the power battery comprise any of: the system comprises a precharge command, a high-voltage connection command, a high-voltage disconnection command and a high-voltage emergency disconnection command.
The present disclosure also provides a fault diagnosis apparatus of a relay. The device comprises:
the voltage judgment module is used for judging the opening and closing state of each relay in the power supply line according to the acquired voltage between a plurality of pairs of reference points in the power supply line of the power battery and generating a relay state flag bit;
the power supply and power down control module is connected with the voltage judgment module and used for controlling a corresponding relay in the power supply circuit to act according to the obtained current power supply control instruction and the relay state flag bit sent by the voltage judgment module, wherein the current power supply control instruction is one of a plurality of power supply control instructions for the power battery;
and the diagnosis control module is respectively connected with the voltage judgment module and the power-up and power-down control module and is used for carrying out fault diagnosis on the corresponding relay in the power supply line according to the current power supply control instruction sent by the power-up and power-down control module and the relay state flag bit sent by the voltage judgment module.
Optionally, the diagnostic control module comprises:
the sending submodule is used for sending the diagnosis result to the power-on and power-off control module;
and the power-on and power-off control module is also used for interrupting the further control of the relay in the power supply line when the received diagnosis result is that the fault exists.
Optionally, the voltage determining module includes:
and the checking submodule is used for checking the judgment result of the closed state of the positive relay and the negative relay of the power battery according to the comparison result of the voltage at two ends of the power battery and the voltage at two ends of the load when the positive relay and the negative relay of the power battery are judged to be in the closed state.
The present disclosure also provides a vehicle. The vehicle includes:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to realize the steps of the fault diagnosis method of the relay provided by the disclosure.
The present disclosure also provides a vehicle. The vehicle comprises the fault diagnosis device of the relay provided by the disclosure.
Through the technical scheme, the power supply control command for the power battery comprises various commands, and the same relay can be arranged in the relays which execute different power supply control commands and need to act. Therefore, fault diagnosis of the same relay can be carried out under the condition of acquiring different power supply control instructions, and the accuracy of fault diagnosis of the relay can be improved due to the diversification of conditions for triggering diagnosis, so that the safety of the whole vehicle is improved.
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 flow chart of a method for fault diagnosis of a relay provided in an exemplary embodiment;
FIG. 2 is a schematic diagram of a power supply line for a power cell provided in an exemplary embodiment;
fig. 3 is a block diagram of a fault diagnosis apparatus of a relay 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 flowchart of a fault diagnosis method of a relay according to an exemplary embodiment. As shown in fig. 1, the method includes the following steps.
In step S11, a current power supply control command is acquired, which is one of a plurality of power supply control commands for the power battery.
In step S12, a fault diagnosis is performed on a relay that needs to be operated to execute the current power supply control command in the power supply line of the power battery.
The power battery of a vehicle usually undergoes a plurality of states during the process from high-voltage power-up to high-voltage power-down, and for example, may sequentially include: an off-line state, a pre-charge control state, a high-voltage on-line state, a high-voltage off-control waiting state, a high-voltage off-control state, a high-voltage emergency off-control state, and the like. There are some states in which the relay does not need to be actuated. There are some states that require controlling the corresponding relay to operate when receiving a power supply control command.
The plurality of power supply control instructions for the power cell may include any of: the system comprises a precharge command, a high-voltage connection command, a high-voltage disconnection command and a high-voltage emergency disconnection command.
For example, when the power battery is in an off-line state, the power battery can be controlled to enter a pre-charging control state in response to a pre-charging command, then the power battery can be controlled to enter a high-voltage control state in response to a high-voltage connection command, then the power battery can be controlled to enter a high-voltage on-line state after high voltage is completed, then the power battery can be controlled to enter a high-voltage disconnection control waiting state, the power battery can be controlled to enter a high-voltage disconnection control state in response to a high-voltage disconnection command, and the power battery can be controlled to enter a high-voltage emergency disconnection control state in response to a high-voltage emergency disconnection command at.
Fig. 2 is a schematic diagram of a power supply line for a power battery provided by an exemplary embodiment. As shown in fig. 2, the relays on the power supply line of the power battery include a positive relay and a pre-charge relay connected to the positive terminal of the power battery, and a negative relay connected to the negative terminal of the power battery.
When some power supply control instructions are executed, the corresponding relays need to act. For example, when the power supply control command is a pre-charge command, the pre-charge relay and the negative electrode relay are closed; when the power supply control instruction is a high-voltage connection instruction, the positive relay is closed, and the pre-charging relay is disconnected; when the electric control instruction is a high-voltage disconnection instruction, the positive relay and the negative relay are disconnected; and when the electric control command is a high-voltage emergency disconnection command, the positive relay, the negative relay and the pre-charging relay are disconnected.
The fault diagnosis includes a fault diagnosis of whether the relay is stuck. For example, if a fault diagnosis of close sticking is to be performed on the positive electrode relay, the trigger points may be a high-voltage open command and a high-voltage emergency open command. That is, the fault diagnosis of the close adhesion of the positive relay can be performed under both the high-voltage open command and the high-voltage emergency open command.
For another example, if a pre-charge relay is to be subjected to fault diagnosis of close adhesion, the trigger points may be a high-voltage connection command and a high-voltage emergency disconnection command. That is, in both cases of a high-voltage connection command and a high-voltage emergency disconnection command, the precharge relay is subjected to fault diagnosis of close adhesion.
Through the technical scheme, the power supply control command for the power battery comprises various commands, and the same relay can be arranged in the relays which execute different power supply control commands and need to act. Therefore, fault diagnosis of the same relay can be carried out under the condition of acquiring different power supply control instructions, and the accuracy of fault diagnosis of the relay can be improved due to the diversification of conditions for triggering diagnosis, so that the safety of the whole vehicle is improved.
In still another embodiment, on the basis of fig. 1, the step of performing fault diagnosis on the relay that needs to be operated to execute the current power supply control command in the power supply line of the power battery (step S12) may include the following steps:
collecting voltages between a plurality of pairs of reference points in a power supply line of the power battery;
judging the opening and closing state of each relay in the power supply line according to the voltage between the multiple pairs of reference points;
and according to the opening and closing state of each relay and the current power supply control instruction, carrying out fault diagnosis on the relays which need to act when the current power supply control instruction is executed in the power supply line of the power battery.
The nodes at the two ends of each relay can be selected as reference points, so that the opening and closing states of each relay can be obtained through simple calculation. Returning to fig. 2, in the embodiment of fig. 2, the reference points may include four reference points, reference point 1 of the negative relay front end, reference point 2 of the negative relay back end, reference point 3 of the positive relay front end, and reference point 4 of the positive relay back end.
The opening and closing state of the corresponding relay can be judged according to the magnitude relation of the voltage between the two pairs of reference points. For example, in the embodiment of fig. 2, when a × V31＜V32＜b*V31And when the current is detected, the negative relay is judged to be closed. Wherein, V31Voltage, V, representing reference point 3 to reference point 132Representing the voltage of reference point 3 versus reference point 2. a. b may be a predetermined parameter, for example, a ═ 0.99, and b ═ 1.01.
In another embodiment, on the basis of the above embodiment, after the step of determining the open/close state of each relay in the power supply line according to the voltages between the pairs of reference points, the step of performing fault diagnosis on the relay that needs to be operated when executing the current power supply control command in the power supply line of the power battery may further include:
and when the positive relay and the negative relay of the power battery are judged to be in the closed state, checking the judgment result of the closed state of the positive relay and the negative relay of the power battery according to the comparison result of the voltage at two ends of the power battery and the voltage at two ends of the load.
In some states (e.g., pre-charge control state, high voltage on-line state), both the positive relay and the negative relay need to be controlled to be closed. After the two are judged to be closed according to the method of the reference point, secondary judgment can be carried out according to the comparison result of the voltage at the two ends of the power battery and the voltage at the two ends of the load, so that the previous judgment result is verified.
Specifically, when both the positive relay and the negative relay are in the closed state, both the power battery terminal voltage and the load terminal voltage are theoretically equal. In practice, if the difference between the voltage across the power battery and the voltage across the load is within a predetermined error range, it can be determined again that both the positive relay and the negative relay are in the closed state. The predetermined error range may be empirically or experimentally determined.
The voltage at the two ends of the power battery can be obtained by directly detecting the voltage difference between the two ends of the power battery, or can be obtained by detecting the voltage difference at the two ends of each single battery (or module) and then adding the voltage differences at the two ends of all the single batteries (or modules).
In the embodiment, when the anode relay and the cathode relay of the power battery are both in a closed state, the judgment can be performed by two different methods, so that the accuracy of the state judgment of the relay is improved, and the accuracy of the fault diagnosis of the relay is improved.
The action of the relay corresponding to each power supply control command can be prestored, and when the opening and closing state of the relay obtained by judging according to the voltage between the reference points accords with the state after the action of the relay corresponding to the current power supply control command, the relay can be judged to have no fault; when the opening and closing state of the relay, which is judged according to the voltage between the reference points, does not accord with the state after the action of the relay corresponding to the current power supply control instruction, the relay can be judged to have the adhered fault.
When none of the diagnosed relays are faulty, the power supply system can proceed to the next operation. When a fault occurs in the diagnosed relay, a necessary control program may be started according to the diagnosis result. The flag bit for generating the diagnosis result can simplify the written program.
The opening and closing state of the relay is judged through the voltage between the reference points, and the opening and closing state of the relay corresponding to the current power supply control instruction is simply compared with the opening and closing state of the relay, so that the adhesion fault of the relay can be diagnosed, and the method is simple and high in speed.
In another embodiment, the step of diagnosing the fault of the relay which needs to be operated to execute the current power supply control command in the power supply line of the power battery according to the opening and closing state of each relay and the current power supply control command may include the following steps:
generating a relay state flag bit according to the opening and closing state of each relay;
and according to the relay state zone bit and the current power supply control instruction, carrying out fault diagnosis on the relay which needs to act when the current power supply control instruction is executed in the power supply line of the power battery.
For example, if the relay state is a closed state, the corresponding state flag is output as 1, and if the relay state is an open state, the corresponding state flag is output as 0. In the embodiment, the fault is judged according to the relay state zone bit, and a program for comparing the voltages between the reference points does not need to be programmed in a fault diagnosis program, so that repeated program programming is not needed, and the code amount is saved.
Based on the same inventive concept, the disclosure also provides a fault diagnosis device of the relay. Fig. 3 is a block diagram of a fault diagnosis apparatus of a relay according to an exemplary embodiment. As shown in fig. 3, the fault diagnosis apparatus of the relay may include a voltage judgment module, a power-up and power-down control module, and a diagnosis control module.
The voltage judgment module is used for judging the opening and closing state of each relay in the power supply line according to the acquired voltage between a plurality of pairs of reference points in the power supply line of the power battery and generating a relay state flag bit;
the power supply and power down control module is connected with the voltage judgment module and used for controlling a corresponding relay in a power supply line to act according to the obtained current power supply control instruction and the relay state zone bit sent by the voltage judgment module, wherein the current power supply control instruction is one of a plurality of power supply control instructions for the power battery;
the diagnosis control module is respectively connected with the voltage judgment module and the power-on and power-off control module and is used for carrying out fault diagnosis on the corresponding relay in the power supply line according to the current power supply control instruction sent by the power-on and power-off control module and the relay state flag bit sent by the voltage judgment module.
In prior art, go up the electrical control module and go up and down and diagnose control module and integrate in an organic whole, the coupling nature is strong, if relay control demand changes to some extent, can lead to the change of electrical control module about going up and down, and then diagnose control module and follow the change in order, the modularization and the platformization management of being not convenient for, it is difficult to update the maintenance, causes the wasting of resources. In addition, in the prior art, a voltage judging module is not provided in the fault diagnosis device of the relay, the diagnosis control module needs to perform corresponding diagnosis through voltage every time, and the diagnosis control module performs corresponding fault diagnosis every time when the relay function is controlled, so that the model or the code is repeated.
In the fault diagnosis device of the relay, the power-on and power-off control module and the diagnosis control module are separated and are mutually independent, namely the power-on and power-off functions of the whole vehicle and the fault diagnosis of the relay are relatively independent, so that the decoupling performance is strong, the code amount is saved, the modularization and the platformization management are facilitated, and the updating and the maintenance are convenient. Meanwhile, a voltage judging module is added and outputs relay state zone bits to the power-on and power-off control module and the diagnosis control module respectively, and the condition of fault judgment is high in reusability. And the voltage judgment module outputs the flag bit of the opening and closing state of each relay. The unified judgment of the on-off of the relay is realized through the voltage judgment module, the judgment is not required for multiple times, and only the zone bit of the corresponding relay needs to be called in the actual use process.
In yet another embodiment, the diagnostic control module may include a transmit sub-module.
And the sending submodule is used for sending the diagnosis result to the power-on and power-off control module. And the power-on and power-off control module is also used for interrupting the further control of the relay in the power supply line when the received diagnosis result is that the fault exists.
In yet another embodiment, the voltage determination module may include a verification sub-module.
And the checking submodule is used for checking the judgment result of the closed state of the positive relay and the negative relay of the power battery according to the comparison result of the voltage at two ends of the power battery and the voltage at two ends of the load when the positive relay and the negative relay of the power battery are judged to be in the closed state.
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.
Based on the same inventive concept, the present disclosure also provides a vehicle. The vehicle includes a memory and a processor. The memory has stored thereon a computer program. The processor is used for executing the computer program in the memory to realize the steps of the fault diagnosis method of the relay provided by the disclosure.
Based on the same inventive concept, the present disclosure also provides a vehicle. The vehicle comprises the fault diagnosis device of the relay provided by the disclosure.
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 the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
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 (10)
1. A fault diagnosis method of a relay, characterized in that the method comprises:
acquiring a current power supply control instruction, wherein the current power supply control instruction is one of a plurality of power supply control instructions for a power battery;
and carrying out fault diagnosis on a relay which needs to be operated when the current power supply control command is executed in a power supply line of the power battery.
2. The method of claim 1, wherein the step of diagnosing a fault in a relay in the power supply line of the power cell that needs to be acted upon to execute the current power supply control command comprises:
collecting voltages between a plurality of pairs of reference points in a power supply line of the power battery;
judging the opening and closing state of each relay in the power supply line according to the voltage between the multiple pairs of reference points;
and according to the opening and closing state of each relay and the current power supply control command, carrying out fault diagnosis on the relay which needs to be operated when the current power supply control command is executed in the power supply line of the power battery.
3. The method according to claim 2, wherein after the step of determining the open-close state of each relay in the power supply line according to the voltages between the pairs of reference points, the step of performing fault diagnosis on the relay which needs to be operated to execute the current power supply control command in the power supply line of the power battery further comprises:
and when the positive relay and the negative relay of the power battery are judged to be in the closed state, checking the judgment result of the closed state of the positive relay and the negative relay of the power battery according to the comparison result of the voltage at two ends of the power battery and the voltage at two ends of the load.
4. The method according to claim 2, wherein the step of diagnosing the fault of the relay which needs to be operated according to the current power supply control command and the opening and closing state of each relay comprises the following steps:
generating a relay state flag bit according to the opening and closing state of each relay;
and according to the relay state zone bit and the current power supply control command, carrying out fault diagnosis on the relay which needs to be operated when the current power supply control command is executed in a power supply line of the power battery.
5. The method of claim 1, wherein the plurality of power supply control commands for the power cell include any of: the system comprises a precharge command, a high-voltage connection command, a high-voltage disconnection command and a high-voltage emergency disconnection command.
6. A fault diagnosis device of a relay, characterized in that the device comprises:
the voltage judgment module is used for judging the opening and closing state of each relay in the power supply line according to the acquired voltage between a plurality of pairs of reference points in the power supply line of the power battery and generating a relay state flag bit;
the power supply and power down control module is connected with the voltage judgment module and used for controlling a corresponding relay in the power supply circuit to act according to the obtained current power supply control instruction and the relay state flag bit sent by the voltage judgment module, wherein the current power supply control instruction is one of a plurality of power supply control instructions for the power battery;
and the diagnosis control module is respectively connected with the voltage judgment module and the power-up and power-down control module and is used for carrying out fault diagnosis on the corresponding relay in the power supply line according to the current power supply control instruction sent by the power-up and power-down control module and the relay state flag bit sent by the voltage judgment module.
7. The apparatus of claim 6, wherein the diagnostic control module comprises:
the sending submodule is used for sending the diagnosis result to the power-on and power-off control module;
and the power-on and power-off control module is also used for interrupting the further control of the relay in the power supply line when the received diagnosis result is that the fault exists.
8. The apparatus of claim 6, wherein the voltage determination module comprises:
and the checking submodule is used for checking the judgment result of the closed state of the positive relay and the negative relay of the power battery according to the comparison result of the voltage at two ends of the power battery and the voltage at two ends of the load when the positive relay and the negative relay of the power battery are judged to be in the closed state.
9. A vehicle, characterized in that the vehicle comprises:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the fault diagnosis method of the relay according to any one of claims 1 to 5.
10. A vehicle characterized by comprising the failure diagnosis device of the relay according to any one of claims 6 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811468580.1A CN111257742A (en) | 2018-12-03 | 2018-12-03 | Fault diagnosis method and device for relay and vehicle |
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| CN201811468580.1A CN111257742A (en) | 2018-12-03 | 2018-12-03 | Fault diagnosis method and device for relay and vehicle |
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| CN111257742A true CN111257742A (en) | 2020-06-09 |
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| CN201811468580.1A Pending CN111257742A (en) | 2018-12-03 | 2018-12-03 | Fault diagnosis method and device for relay and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113640661A (en) * | 2021-08-25 | 2021-11-12 | 南京优倍电气技术有限公司 | Line fault monitoring system based on safety relay |
| CN114228495A (en) * | 2021-12-31 | 2022-03-25 | 中国第一汽车股份有限公司 | Power battery relay control method and device and new energy automobile |
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| CN104330726A (en) * | 2014-10-24 | 2015-02-04 | 华晨汽车集团控股有限公司 | Relay state diagnosing method applied to high-voltage circuit of electric car |
| CN107482591A (en) * | 2017-08-01 | 2017-12-15 | 安徽欧鹏巴赫新能源科技有限公司 | A kind of on-board high-voltage relay safety protecting method |
| CN108761324A (en) * | 2018-06-15 | 2018-11-06 | 爱驰汽车有限公司 | The diagnostic method and device of the high-voltage relay functional response failure of battery pack |
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| CN104330726A (en) * | 2014-10-24 | 2015-02-04 | 华晨汽车集团控股有限公司 | Relay state diagnosing method applied to high-voltage circuit of electric car |
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| CN113640661A (en) * | 2021-08-25 | 2021-11-12 | 南京优倍电气技术有限公司 | Line fault monitoring system based on safety relay |
| CN114228495A (en) * | 2021-12-31 | 2022-03-25 | 中国第一汽车股份有限公司 | Power battery relay control method and device and new energy automobile |
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