CN112147493A - Fault diagnosis system, fault diagnosis method and vehicle - Google Patents
Fault diagnosis system, fault diagnosis method and vehicle Download PDFInfo
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- CN112147493A CN112147493A CN201910569435.0A CN201910569435A CN112147493A CN 112147493 A CN112147493 A CN 112147493A CN 201910569435 A CN201910569435 A CN 201910569435A CN 112147493 A CN112147493 A CN 112147493A
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000011084 recovery Methods 0.000 claims abstract description 117
- 238000000605 extraction Methods 0.000 claims description 26
- 239000000126 substance Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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Abstract
The invention provides a fault diagnosis system, a fault diagnosis method and a vehicle, wherein the fault diagnosis system comprises: the system comprises a vehicle control unit, a relay and a power supply; the relay is provided with an input end, an output end and a power supply end, the power supply end is connected with the power supply, and the output end is grounded through the electric equipment; the vehicle control unit is respectively connected with the input end and the output end of the relay, and is used for outputting a relay control command to the input end, acquiring a first recovery voltage of the input end and a second recovery voltage of the output end, and determining the fault type of the relay according to the first recovery voltage and the second recovery voltage; wherein the fault types include a relay control line fault and a relay internal fault.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a fault diagnosis system, a fault diagnosis method and a vehicle.
Background
With the development of vehicle technology, the performance requirements of users on vehicles are higher and higher. For example, since the fault diagnosis system of the vehicle can determine the technical condition of the vehicle or pinpoint the cause of a fault in the case where the vehicle has a potential fault, a deteriorated technical condition, or has partially or completely lost the operation capability, its performance is in wide interest of users.
In the existing vehicle, a relay is often used as a switch of a power supply circuit such as a compressor, a fan motor, a water pump, a four-way valve and the like. Specifically, the power circuit can be switched on or off through the attraction or release of the relay contact, so as to control the operation or the stalling of the related equipment. In practical applications, when a relay has a hidden trouble, a technical condition is deteriorated, or a partial or complete failure occurs, a fault diagnosis system is usually required to diagnose a fault of the relay.
However, in the conventional fault diagnosis system, only the control line of the relay can be subjected to fault diagnosis, and the internal fault of the relay cannot be diagnosed, so that an operator needs to manually further diagnose the internal fault of the relay after the fault of the control line is eliminated in the process of fault diagnosis of the relay. That is, in the conventional failure diagnosis system, the failure diagnosis capability of the relay is not comprehensive, and the diagnosis efficiency is low.
Disclosure of Invention
In view of this, the present invention is directed to a fault diagnosis system, so as to solve the problems of the existing fault diagnosis system that the fault diagnosis capability of the relay is not comprehensive enough and the diagnosis efficiency is low.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a fault diagnosis system for a vehicle including a power consumer therein, the fault diagnosis system comprising: the system comprises a vehicle control unit, a relay and a power supply; wherein the content of the first and second substances,
the relay is provided with an input end, an output end and a power supply end, the power supply end is connected with the power supply, and the output end is grounded through the electric equipment;
the vehicle control unit is respectively connected with the input end and the output end of the relay, and is used for outputting a relay control command to the input end, acquiring a first recovery voltage of the input end and a second recovery voltage of the output end, and determining the fault type of the relay according to the first recovery voltage and the second recovery voltage; wherein the fault types include a relay control line fault and a relay internal fault.
Further, the relay control command includes an enable relay command and a disconnect relay command.
Furthermore, the faults of the relay control circuit comprise an open-circuit fault and a power supply short-circuit fault, and the internal faults of the relay comprise a relay non-actuation fault;
the vehicle control unit is used for outputting an enabling relay instruction to the input end, determining that the fault type is a power supply short-circuit fault when the first recovery voltage is greater than or equal to a first preset value, determining that the fault type is an open-circuit fault when the first recovery voltage is smaller than the first preset value and larger than a second preset value, and determining that the fault type is a relay non-pull-in fault when the second recovery voltage is smaller than or equal to the second preset value.
Furthermore, the relay control circuit faults also include short-circuit faults to the ground, and the internal faults of the relay also include adhesion faults of the relay;
the vehicle control unit is configured to output a relay disconnection instruction to the input end, determine that the fault type is a short-circuit to ground fault when the first recovery voltage is less than or equal to a second preset value, determine that the fault type is an open-circuit fault when the first recovery voltage is between the second preset value and the first preset value, and determine that the fault type is a relay adhesion fault when the second recovery voltage is greater than or equal to the first preset value.
Further, the vehicle control unit is connected with the power supply, and the vehicle control unit is configured to detect an output voltage of the power supply, and output a relay control instruction to the input terminal when the output voltage meets a preset range.
Compared with the prior art, the fault diagnosis system has the following advantages:
in the fault diagnosis system according to the embodiment of the present invention, the vehicle controller is respectively connected to an input terminal and an output terminal of the relay, and the vehicle controller may be configured to output a relay control instruction to the input terminal, collect a first recovery voltage of the input terminal and a second recovery voltage of the output terminal, and obtain a fault type of the relay according to the first recovery voltage and the second recovery voltage; wherein the fault types include a relay control line fault and a relay internal fault. In other words, in the embodiment of the invention, the fault diagnosis system can diagnose not only the fault of the relay control circuit, but also the internal fault of the relay, and has comprehensive diagnosis capability and higher diagnosis efficiency.
The invention also aims to provide a fault diagnosis method to solve the problems that the fault diagnosis capability of the relay is not comprehensive and the diagnosis efficiency is low in the conventional fault diagnosis system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a fault diagnosis method for the fault diagnosis system, the fault diagnosis method comprising:
outputting a relay control instruction to an input end of the relay;
collecting a first recovery voltage at the input end of the relay and a second recovery voltage at the output end of the relay;
determining the fault type of the relay according to the first recovery voltage and the second recovery voltage; wherein the fault types include a relay control line fault and a relay internal fault.
Further, the relay control command includes an enable relay command and a disconnect relay command.
Furthermore, the faults of the relay control circuit comprise an open-circuit fault and a power supply short-circuit fault, and the internal faults of the relay comprise a relay non-actuation fault;
when the relay control instruction is an enable relay instruction, determining the fault type of the relay according to the first recovery voltage and the second recovery voltage, including:
determining the fault type to be a power supply short circuit fault under the condition that the first stopover voltage is greater than or equal to a first preset value;
determining the fault type to be an open-circuit fault under the condition that the first recovery voltage is larger than the first preset value and smaller than a second preset value;
and determining the fault type as a relay no-pull-in fault under the condition that the second extraction voltage is less than or equal to the second preset value.
Furthermore, the relay control circuit faults also include short-circuit faults to the ground, and the internal faults of the relay also include adhesion faults of the relay;
when the relay control instruction is an instruction for switching off the relay, determining the fault type of the relay according to the first recovery voltage and the second recovery voltage, including:
determining the fault type to be a short-circuit to ground fault under the condition that the first recovery voltage is smaller than or equal to a second preset value;
determining the fault type to be an open-circuit fault under the condition that the first recovery voltage is larger than the second preset value and smaller than a first preset value;
and determining the fault type to be a relay adhesion fault under the condition that the second extraction voltage is greater than or equal to the first preset value.
Further, the outputting a relay control command to an input terminal of the relay includes:
detecting an output voltage of the power supply;
and under the condition that the output voltage meets a preset range, outputting a relay control instruction to an input end of the relay.
Compared with the prior art, the fault diagnosis method has the following advantages:
in the fault diagnosis method according to the embodiment of the present invention, the vehicle controller is respectively connected to an input terminal and an output terminal of the relay, and the vehicle controller may be configured to output a relay control command to the input terminal, collect a first recovery voltage of the input terminal and a second recovery voltage of the output terminal, and obtain a fault type of the relay according to the first recovery voltage and the second recovery voltage; wherein the fault types include a relay control line fault and a relay internal fault. In other words, according to the embodiment of the invention, the fault diagnosis method can diagnose not only the fault of the relay control circuit, but also the internal fault of the relay, and has the advantages of comprehensive diagnosis capability and high diagnosis efficiency.
The invention further aims to provide a vehicle to solve the problems that the fault diagnosis capability of the relay is not comprehensive and the diagnosis efficiency is low in the conventional fault diagnosis system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a vehicle, the vehicle comprising: the fault diagnosis system is provided.
The vehicle and the fault diagnosis system have the same advantages compared with the prior art, and the detailed description is omitted.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a fault diagnosis system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another fault diagnosis system according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating steps of a method for fault diagnosis according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating steps of a fault diagnosis method according to an embodiment of the present invention.
Description of reference numerals:
10-a whole vehicle controller, 101-a control module, 102-a driving chip, 11-a relay, 12-a power supply, 13-a power utilization device, an A-input end, a B-output end, a C-power supply end and a D-ground end.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, a schematic structural diagram of a fault diagnosis system according to an embodiment of the present invention is shown, where the fault diagnosis system may be used in a vehicle, and the vehicle may include an electric device 13, and specifically, the fault diagnosis system may include: the vehicle control unit 10, the relay 11 and the power supply 12; the relay 11 is provided with an input end A, an output end B and a power supply end C, the power supply end C is connected with the power supply 12, and the output end B is grounded through the electric equipment 13; the vehicle control unit 10 is respectively connected with an input end A and an output end B of the relay 11, and the vehicle control unit 10 is used for outputting a relay control instruction to the input end A, acquiring a first recovery voltage of the input end A and a second recovery voltage of the output end B, and determining the fault type of the relay 11 according to the first recovery voltage and the second recovery voltage; wherein the fault types include a relay control line fault and a relay internal fault.
In practical applications, the power source 12 may be a power supply device such as a storage battery in the vehicle, and the electric device 13 may be a compressor, a fan motor, a water pump, a four-way valve, and other devices requiring electricity in the vehicle.
In the embodiment of the present invention, the vehicle control unit 10 is respectively connected to the input end a and the output end B of the relay 10, and after the vehicle control unit 10 outputs the relay control instruction to the input end a, the vehicle control unit 10 may recover the voltage of the input end a to obtain the first recovery voltage. In practical applications, in the case where the first extraction voltage is abnormal, the fault type of the relay 11 may be determined as a relay control line fault. Similarly, after the vehicle control unit 10 outputs the relay control command to the input end a, the vehicle control unit 10 may also recover the voltage of the output end B to obtain the second recovery voltage. In practical applications, in the case where the second extraction voltage is abnormal, the fault type of the relay 11 may be determined as a relay internal fault.
In the fault diagnosis system according to the embodiment of the present invention, the vehicle control unit 10 is respectively connected to the input terminal a and the output terminal B of the relay 10, and the vehicle control unit 10 may be configured to output a relay control instruction to the input terminal a, collect a first recovery voltage of the input terminal a and a second recovery voltage of the output terminal B, and determine a fault type of the relay 11 according to the first recovery voltage and the second recovery voltage; wherein the fault types include a relay control line fault and a relay internal fault. In other words, in the embodiment of the invention, the fault diagnosis system can diagnose not only the fault of the relay control circuit, but also the internal fault of the relay, and has comprehensive diagnosis capability and higher diagnosis efficiency.
In practical applications, the relay control command may include an enable relay command and an open relay command. Specifically, the enable relay command may be used to control the contact actuation of the relay 11, so that the power source 12 may supply power to the electric device 13, and further, the electric device 13 may be powered to work. The relay opening command may be used to control the release of the contacts of the relay 11 to disconnect the power source 12 from the electric device 13, and thus, to stop the electric device 13.
In the embodiment of the invention, because the power supply end C of the relay 11 is connected with the power supply 12, the output end B of the relay 11 is grounded through the electric equipment 13. Therefore, in the case that the relay 11 is not in fault, when the relay control command is a relay enabling command, the first recovery voltage should be less than or equal to a second preset value, and the second recovery voltage should be greater than or equal to a first preset value; when the relay control instruction is a relay disconnection instruction, the first recovery voltage should be greater than or equal to the first preset value, and the second recovery voltage should be less than or equal to the second preset value.
It is understood that, in practical applications, the first preset value and the second preset value may be determined according to the output voltage of the power supply 12. For example, in the case where the output voltage of the power supply 12 is 12 volts, the first preset value may be 5 volts, and the second preset value may be 3.3 volts. Specifically, when the extraction voltage is greater than or equal to the first preset value, the extraction voltage signal may be considered as a high level signal, when the extraction voltage is less than or equal to the second preset value, the extraction voltage signal may be considered as a low level signal, and when the extraction voltage is less than the first preset value and greater than the second preset value, the extraction voltage signal may be considered as a floating level signal.
In an alternative embodiment of the present invention, the relay control line faults may include open circuit faults and short circuit to power faults, and the relay internal faults may include relay no pull-in faults.
Specifically, the vehicle control unit 10 may be configured to output an enable relay command to an input end a, determine that the fault type is a short-circuit fault to a power supply when the first recovery voltage is greater than or equal to a first preset value, determine that the fault type is an open-circuit fault when the first recovery voltage is smaller than the first preset value and larger than a second preset value, and determine that the fault type is a relay non-pull-in fault when the second recovery voltage is smaller than or equal to the second preset value.
In the embodiment of the present invention, when the relay control command is a relay enabling command, the first recovery voltage should be less than or equal to a second preset value, and the second recovery voltage should be greater than or equal to the first preset value, under the condition that the relay 11 is not in fault. Therefore, when the relay control instruction is an enable relay instruction, and the first recovery voltage is greater than or equal to a first preset value, it can be considered that a control circuit between the relay 11 and the power supply 12 is short-circuited, and the fault type of the relay 11 is a short-circuit fault to the power supply; when the first recovery voltage is smaller than the first preset value and larger than the second preset value, it may be considered that an interruption point exists between the relay 11 and the power source 12 or between the relay 11 and the ground terminal D, and the fault type of the relay 11 is an open-circuit fault. Under the condition that the second extraction voltage is less than or equal to the second preset value, the power supply end C and the output end B of the relay 11 are not conducted, so that the fault type of the relay 11 can be determined to be a non-actuation fault of the relay.
In another optional embodiment of the invention, the relay control line fault may further comprise a short-to-ground fault, and the relay internal fault further comprises a relay sticking fault.
The vehicle control unit 10 may be configured to output a command to turn off a relay to an input end a, determine that the fault type is a short-circuit to ground fault when the first recovery voltage is less than or equal to a second preset value, determine that the fault type is an open-circuit fault when the first recovery voltage is greater than the second preset value and less than the first preset value, and determine that the fault type is a relay adhesion fault when the second recovery voltage is greater than or equal to the first preset value.
In the embodiment of the present invention, when the relay control command is a command to turn off the relay under the condition that the relay 11 is not in fault, the first recovery voltage should be greater than or equal to the first preset value, and the second recovery voltage should be less than or equal to the second preset value. Therefore, when the relay control instruction is an instruction for opening the relay, and the first recovery voltage is less than or equal to a second preset value, it can be considered that the control line from the relay 11 to the ground terminal D is short-circuited, and the fault type of the relay 11 is a short-circuit to ground fault; when the first recovery voltage is smaller than the first preset value and larger than the second preset value, it may be considered that an interruption point exists between the relay 11 and the power source 12 or between the relay 11 and the ground terminal D, and the fault type of the relay 11 is an open-circuit fault. And under the condition that the second extraction voltage is greater than or equal to the second preset value, the power supply end C and the output end B of the relay 11 are conducted, and the contact of the relay 11 is not released, so that the fault type of the relay 11 can be determined to be a relay adhesion fault.
Referring to fig. 2, which shows a schematic structural diagram of another fault diagnosis system according to an embodiment of the present invention, as shown in fig. 2, a vehicle control unit 10 may be divided into a control module 101 and a driver chip 102, the control module 101 is connected to the driver chip 102, the control module 101 may be connected to an input terminal a of a relay 11 through the driver chip 102, and the control module 101 may be connected to an output terminal B of the relay 11.
Specifically, the driving chip 102 may be configured to drive the contact of the relay 11 to be pulled in or released according to a relay control instruction output by the control module 101, and further extract the first extraction voltage at the input terminal a of the relay 11, and determine a fault of the relay control line of the relay according to the first extraction voltage.
In an alternative embodiment of the present invention, the vehicle control unit 10 may be further connected to the power supply 12, and the vehicle control unit 10 may be configured to detect an output voltage of the power supply 10, and output a relay control command to the input terminal a when the output voltage satisfies a preset range.
Specifically, the preset range may be an enabling condition for performing fault diagnosis on the relay 11, and a diagnosis result of performing fault diagnosis on the relay 11 is reliable only when the output voltage of the power supply 12 satisfies the preset range. Illustratively, the predetermined range may be 7.5 volts to 8.5 volts.
In the embodiment of the present invention, before outputting the relay control instruction to the input terminal a of the relay 11, the vehicle control unit 10 may first detect the output voltage of the power supply 12, output the relay control instruction to the input terminal a to perform fault diagnosis on the relay 11 when the output voltage satisfies the preset range, and stop performing fault diagnosis on the relay 11 without outputting the relay control instruction to the input terminal a when the output voltage does not satisfy the preset range, so that reliability of a diagnosis result in performing fault diagnosis on the relay 11 may be improved.
In summary, the fault diagnosis system according to the embodiment of the present invention at least includes the following advantages:
in the fault diagnosis system according to the embodiment of the present invention, the vehicle controller is respectively connected to an input terminal and an output terminal of the relay, and the vehicle controller may be configured to output a relay control instruction to the input terminal, collect a first recovery voltage of the input terminal and a second recovery voltage of the output terminal, and obtain a fault type of the relay according to the first recovery voltage and the second recovery voltage; wherein the fault types include a relay control line fault and a relay internal fault. In other words, in the embodiment of the invention, the fault diagnosis system can diagnose not only the fault of the relay control circuit, but also the internal fault of the relay, and has comprehensive diagnosis capability and higher diagnosis efficiency.
The embodiment of the invention also provides a fault diagnosis method which can be used for the fault diagnosis system.
Referring to fig. 3, a flowchart illustrating steps of a fault diagnosis method according to an embodiment of the present invention is shown, where the fault diagnosis method may specifically include:
step 301: and outputting a relay control instruction to the input end of the relay.
In the embodiment of the invention, the relay is provided with an input end, an output end and a power supply end, the power supply end is connected with a power supply, and the output end is grounded through electric equipment
The relay control instructions may include enable relay instructions and open relay instructions. Specifically, the enabling relay instruction can be used for controlling contact attraction of the relay, so that the power supply can supply power to the electric equipment, and further, the electric equipment can be powered on to work. The relay opening command may be used to control the release of a contact of the relay, to disconnect the power supply from the electrical device, and to stop the electrical device.
Step 302: and collecting a first recovery voltage at the input end of the relay and a second recovery voltage at the output end of the relay.
In the embodiment of the invention, the vehicle control unit is respectively connected with the input end and the output end of the relay, and after the vehicle control unit outputs the relay control instruction to the input end, the voltage of the input end can be acquired to obtain the first acquisition voltage. Similarly, after the vehicle control unit outputs the relay control instruction to the input end, the vehicle control unit may also recover the voltage of the output end to obtain the second recovery voltage.
Step 303: determining the fault type of the relay according to the first recovery voltage and the second recovery voltage; wherein the fault types include a relay control line fault and a relay internal fault.
In the embodiment of the invention, as the power supply end of the relay is connected with the power supply, the output end of the relay is grounded through the electric equipment. Therefore, under the condition that the relay is not in fault, when the relay control command is a relay enabling command, the first recovery voltage should be smaller than or equal to a second preset value, and the second recovery voltage should be larger than or equal to a first preset value; when the relay control instruction is a relay disconnection instruction, the first recovery voltage should be greater than or equal to the first preset value, and the second recovery voltage should be less than or equal to the second preset value.
It is understood that, in practical applications, the first preset value and the second preset value may be determined according to the output voltage of the power supply. For example, in the case where the output voltage of the power supply is 12 volts, the first preset value may be 5 volts, and the second preset value may be 3.3 volts. Specifically, when the extraction voltage is greater than or equal to the first preset value, the extraction voltage signal may be considered as a high level signal, when the extraction voltage is less than or equal to the second preset value, the extraction voltage signal may be considered as a low level signal, and when the extraction voltage is less than the first preset value and greater than the second preset value, the extraction voltage signal may be considered as a floating level signal.
In an alternative embodiment of the present invention, the relay control line faults may include open circuit faults and short circuit to power faults, and the relay internal faults may include relay no pull-in faults.
In practical application, when the relay control command is a command for enabling the relay under the condition that the relay does not have a fault, the first recovery voltage should be smaller than or equal to a second preset value, the second recovery voltage should be larger than or equal to a first preset value, the first recovery voltage should be smaller than or equal to a second preset value, and the second recovery voltage should be larger than or equal to the first preset value.
Optionally, when the relay control command is an enable relay command, step 303 may include the following sub-steps:
step S11: and determining the fault type as a power supply short circuit fault under the condition that the first recovery voltage is greater than or equal to a first preset value.
In practical application, when the relay control command is a relay enabling command, and the first recovery voltage is greater than or equal to a first preset value, it can be considered that a control line between the relay and the power supply is short-circuited, and the fault type of the relay is a short-circuit fault to the power supply
Step S12: and determining the fault type to be an open-circuit fault under the condition that the first recovery voltage is smaller than the first preset value and larger than a second preset value.
In practical application, when the relay control command is a command for enabling a relay, and the first recovery voltage is smaller than the first preset value and larger than the second preset value, it may be considered that an interruption point exists between the relay and the power supply or between the relay and a ground terminal, and the fault type of the relay is an open-circuit fault.
Step S13: and determining the fault type as a relay no-pull-in fault under the condition that the second extraction voltage is less than or equal to the second preset value.
In practical application, when the relay control instruction is an enable relay instruction, and the second extraction voltage is less than or equal to the second preset value, the power end and the output end of the relay are not conducted, so that the fault type of the relay can be determined to be a non-actuation fault of the relay.
In another optional embodiment of the invention, the relay control line fault may further comprise a short-to-ground fault, and the relay internal fault further comprises a relay sticking fault.
In practical application, when the relay control command is a relay disconnection command, the first recovery voltage should be greater than or equal to the first preset value, and the second recovery voltage should be less than or equal to the second preset value, under the condition that the relay does not have a fault.
Optionally, when the relay control command is an open relay command, step 303 may include:
step S21: and determining the fault type to be a short-circuit to ground fault under the condition that the first recovery voltage is less than or equal to a second preset value.
In practical application, when the relay control instruction is an instruction for opening the relay, and the first recovery voltage is less than or equal to a second preset value, it can be considered that a control line between the relay and a ground terminal is short-circuited, and the fault type of the relay is a short-circuit to ground fault.
Step S22: and determining the fault type to be an open-circuit fault under the condition that the first recovery voltage is greater than the second preset value and smaller than the first preset value.
In practical application, when the relay control command is a command for opening the relay, and the first recovery voltage is smaller than the first preset value and larger than the second preset value, it may be considered that an interruption point exists between the relay and the power supply or between the relay and the ground, and the fault type of the relay is an open-circuit fault.
Step S23: and determining the fault type to be a relay adhesion fault under the condition that the second extraction voltage is greater than or equal to the first preset value.
In practical application, when the relay control instruction is an instruction for switching off the relay, and the second extraction voltage is greater than or equal to the second preset value, the power end and the output end of the relay are connected, and the contact of the relay is not released, so that the fault type of the relay can be determined to be a relay adhesion fault.
In summary, the fault diagnosis method according to the embodiment of the present invention at least includes the following advantages:
in the fault diagnosis method according to the embodiment of the present invention, the vehicle controller is respectively connected to an input terminal and an output terminal of the relay, and the vehicle controller may be configured to output a relay control command to the input terminal, collect a first recovery voltage of the input terminal and a second recovery voltage of the output terminal, and obtain a fault type of the relay according to the first recovery voltage and the second recovery voltage; wherein the fault types include a relay control line fault and a relay internal fault. In other words, according to the embodiment of the invention, the fault diagnosis method can diagnose not only the fault of the relay control circuit, but also the internal fault of the relay, and has the advantages of comprehensive diagnosis capability and high diagnosis efficiency.
Referring to fig. 4, a flowchart illustrating steps of a fault diagnosis method according to an embodiment of the present invention is shown, where the fault diagnosis method may specifically include:
step 401: an output voltage of the power supply is detected.
In practical applications, the vehicle control unit may be connected to the power source, so that the vehicle control unit may detect an output voltage of the power source.
Step 402: and under the condition that the output voltage meets a preset range, outputting a relay control instruction to an input end of the relay.
In practical application, the preset range may be an enabling condition for performing fault diagnosis on the relay, and a diagnosis result of performing fault diagnosis on the relay is only reliable if the output voltage of the power supply satisfies the preset range. Illustratively, the predetermined range may be 7.5 volts to 8.5 volts.
In the embodiment of the invention, before outputting the relay control instruction to the input end of the relay, the vehicle control unit may detect the output voltage of the power supply, output the relay control instruction to the input end to perform fault diagnosis on the relay when the output voltage meets the preset range, and stop performing fault diagnosis on the relay without outputting the relay control instruction to the input end when the output voltage does not meet the preset range, so that the reliability of a diagnosis result in performing fault diagnosis on the relay can be improved.
Step 403: and collecting a first recovery voltage at the input end of the relay and a second recovery voltage at the output end of the relay.
The process is specifically implemented with reference to step 302.
Step 404: determining the fault type of the relay according to the first recovery voltage and the second recovery voltage; wherein the fault types include a relay control line fault and a relay internal fault.
The process is specifically carried out with reference to step 303.
In summary, the fault diagnosis method according to the embodiment of the present invention at least includes the following advantages:
first, in the fault diagnosis method according to the embodiment of the present invention, before outputting the relay control command to the input terminal of the relay, the output voltage of the power supply may be detected, and the relay control command may be output to the input terminal again when the output voltage satisfies the preset range, so that the reliability of the diagnosis result when the fault diagnosis is performed on the relay may be improved.
In addition, according to the embodiment of the invention, the fault diagnosis method can diagnose the fault of the relay control circuit and the internal fault of the relay, and has the advantages of comprehensive diagnosis capability and higher diagnosis efficiency.
The embodiment of the present invention further provides a vehicle, which may specifically include: the fault diagnosis system is provided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A fault diagnosis system for a vehicle including a power consumer therein, the fault diagnosis system comprising: the system comprises a vehicle control unit, a relay and a power supply; wherein the content of the first and second substances,
the relay is provided with an input end, an output end and a power supply end, the power supply end is connected with the power supply, and the output end is grounded through the electric equipment;
the vehicle control unit is respectively connected with the input end and the output end of the relay, and is used for outputting a relay control command to the input end, acquiring a first recovery voltage of the input end and a second recovery voltage of the output end, and determining the fault type of the relay according to the first recovery voltage and the second recovery voltage; wherein the fault types include a relay control line fault and a relay internal fault.
2. The fault diagnostic system of claim 1, wherein the relay control instructions comprise enable relay instructions and open relay instructions.
3. The fault diagnosis system according to claim 2, wherein the relay control line fault includes an open-circuit fault and a short-circuit to power supply fault, and the relay internal fault includes a relay no-pull-in fault;
the vehicle control unit is configured to output the enable relay instruction to the input end, determine that the fault type is the power supply short-circuit fault when the first recovery voltage is greater than or equal to a first preset value, determine that the fault type is the open-circuit fault when the first recovery voltage is smaller than the first preset value and larger than a second preset value, and determine that the fault type is the relay non-actuation fault when the second recovery voltage is smaller than or equal to the second preset value.
4. The fault diagnostic system of claim 3, wherein the relay control line fault further comprises a short to ground fault, the relay internal fault further comprises a relay stick fault;
the vehicle control unit is configured to output the relay disconnection instruction to the input end, determine that the fault type is the short-circuit to ground fault when the first recovery voltage is less than or equal to the second preset value, determine that the fault type is the open-circuit fault when the first recovery voltage is greater than the second preset value and less than the first preset value, and determine that the fault type is the relay adhesion fault when the second recovery voltage is greater than or equal to the first preset value.
5. The system for diagnosing faults as claimed in claim 1, wherein the vehicle control unit is connected to the power supply, and the vehicle control unit is configured to detect an output voltage of the power supply and output the relay control command to the input terminal if the output voltage satisfies a preset range.
6. A failure diagnosis method for the failure diagnosis system according to any one of claims 1 to 5, characterized in that the failure diagnosis method comprises:
outputting a relay control instruction to an input end of the relay;
collecting a first recovery voltage at the input end of the relay and a second recovery voltage at the output end of the relay;
determining the fault type of the relay according to the first recovery voltage and the second recovery voltage; wherein the fault types include a relay control line fault and a relay internal fault.
7. The fault diagnosis method according to claim 6, wherein the relay control command includes an enable relay command and a break relay command, the relay control line fault includes an open fault and a short-circuit to power fault, and the relay internal fault includes a relay no-pull-in fault;
when the relay control instruction is the enable relay instruction, determining the fault type of the relay according to the first recovery voltage and the second recovery voltage, including:
determining the fault type to be the pair of power supply short-circuit faults under the condition that the first stopover voltage is greater than or equal to a first preset value;
determining the fault type to be the open-circuit fault under the condition that the first recovery voltage is smaller than the first preset value and larger than a second preset value;
and determining the fault type as the non-pull-in fault of the relay under the condition that the second extraction voltage is less than or equal to the second preset value.
8. The fault diagnosis method according to claim 7, wherein the relay control line fault further includes a short-to-ground fault, and the relay internal fault further includes a relay sticking fault;
when the relay control instruction is the relay disconnection instruction, determining the fault type of the relay according to the first recovery voltage and the second recovery voltage, including:
determining the fault type to be the ground short circuit fault under the condition that the first recovery voltage is smaller than or equal to a second preset value;
determining the fault type to be the open-circuit fault under the condition that the first recovery voltage is larger than the second preset value and smaller than the first preset value;
and determining the fault type to be the relay adhesion fault under the condition that the second extraction voltage is greater than or equal to the first preset value.
9. The fault diagnosis method according to claim 6, wherein outputting a relay control command to an input terminal of a relay includes:
detecting an output voltage of the power supply;
and under the condition that the output voltage meets a preset range, outputting the relay control instruction to the input end of the relay.
10. A vehicle, characterized in that the vehicle comprises: the fault diagnosis system of any one of claims 1 to 5.
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| CN201910569435.0A CN112147493A (en) | 2019-06-27 | 2019-06-27 | Fault diagnosis system, fault diagnosis method and vehicle |
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| CN201910569435.0A CN112147493A (en) | 2019-06-27 | 2019-06-27 | Fault diagnosis system, fault diagnosis method and vehicle |
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Cited By (1)
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| CN112986814A (en) * | 2021-04-28 | 2021-06-18 | 潍柴动力股份有限公司 | Fault diagnosis device and method for relay |
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Application publication date: 20201229 |