CN112198858A - Electric vehicle motor controller wireless diagnosis method, device, medium and equipment based on UDS protocol - Google Patents
Electric vehicle motor controller wireless diagnosis method, device, medium and equipment based on UDS protocol Download PDFInfo
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- 238000013024 troubleshooting Methods 0.000 claims abstract description 10
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
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Abstract
The invention discloses a wireless diagnosis method of an electric vehicle motor controller based on a UDS protocol, which adopts a wireless communication transmission mode, establishes a diagnosis communication mechanism with an ECU of the motor controller based on a UDS unified diagnosis service rule of a CAN bus, reads fault information and parameters stored in a storage area in the ECU, and analyzes the fault information and parameters to perform fault troubleshooting. The invention also discloses a wireless diagnosis device, which comprises a client and a wireless communication module, wherein the client establishes diagnosis communication with the ECU of the motor controller through the communication module and based on the UDS unified diagnosis service rule of the CAN bus, reads the fault information and parameters stored in the internal storage area of the ECU, and analyzes the fault information and parameters to perform fault troubleshooting. The invention also correspondingly discloses a medium and equipment corresponding to the method. The method, the device, the medium and the equipment have the advantages of safe and reliable communication, good stability, improvement of working efficiency and the like.
Description
Technical Field
The invention mainly relates to the technical field of electric vehicle testing, in particular to a method, a device, a medium and equipment for wirelessly diagnosing a motor controller of an electric vehicle based on a UDS protocol.
Background
With the increasing number of ECU (electronic Control unit) components in automobiles, different faults are inevitably generated by the ECUs due to the influence of external environment and the aging of the devices of the ECUs during long-term use. When a vehicle is after sale due to a failure, it is necessary to quickly read information of the failed ECU and identify a component and a cause of the failure without detaching the body of the vehicle or the ECU case, and the failure diagnosis function is a function essential to each ECU. Meanwhile, when defects and faults caused by software reasons occur in the ECU or the ECU function needs to be updated iteratively, the ECU also needs to support an online program updating function.
At present, Beijing university of transportation proposes an invention patent application: an automobile fault diagnosis system based on a Bluetooth technology mainly switches an industrial field bus CANBUS to a Bluetooth wireless network, and inquires equipment working state and fault codes in a CAN bus in a wireless transmission mode, so that fault diagnosis is carried out on an automobile. Rely on the bluetooth in time to realize reading of car trouble information to show on transmitting trouble information to the computer, need carry the computer in the in-service use, have the inconvenience to a certain extent.
Patent application of a practical novel provided by chengda-jun new energy automobile science and technology limited company: the handheld fault wireless diagnostic instrument comprises a data processing unit, a radio frequency communication module, a data storage module, a USB-to-RS 232 data communication module, a capacitance touch module and an LCD display module, wherein the radio frequency communication module, the data storage module, the USB-to-RS 232 data communication module, the capacitance touch module and the LCD display module are respectively connected with the data processing unit, the radio frequency communication module is in wireless connection with an MCU of the electric automobile, and the data communication module is in wired or wireless connection with a computer. The fault information transmission between the computer and the motor controller is realized by adopting a wireless radio frequency communication mode, and the wireless data transmission by adopting the mode has larger instability because metal has larger interference to the wireless radio frequency communication in the whole vehicle environment.
Shanghai county power control technology, Inc. filed a utility model patent application: a motor controller in the system is connected with a vehicle control unit through a CAN bus, a first memory, a second memory and a third memory of the system are respectively connected with a motor controller information output end, the motor controller circularly stores system operation information in the first memory and the second memory and stores system fault information in the third memory by taking 10-200 us and 1-20 ms as sending periods, and a wireless sending/receiving module is connected with the motor controller and transmits information among the first memory, the second memory, the third memory and a remote terminal through a remote network. The system does not carry out fault diagnosis according to the UDS standard specification in the working process, so that inconvenience is brought to the realization of subsequent after-sale maintenance and car networking functions.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides a method, a device, a medium and equipment for wirelessly diagnosing a motor controller of an electric automobile based on a UDS protocol, which are used for improving the working efficiency.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a wireless diagnosis method for an electric vehicle motor controller based on a UDS protocol adopts a wireless communication transmission mode, establishes a diagnosis communication mechanism with an ECU of the motor controller based on a UDS unified diagnosis service rule of a CAN bus, reads fault information and parameters stored in a storage area inside the ECU, and analyzes the fault information and parameters to perform fault troubleshooting.
As a further improvement of the above technical solution:
one or more of the following five sub-services are wirelessly transmitted to achieve reading of fault information in different modes: the five sub-services include: reading the number of faults; reading fault codes and states of faults according to the fault masks; reading fault snapshot information, namely various state information of the motor controller when a fault occurs, and assisting to determine the fault occurrence reason; reading fault extension information; all fault codes and states supported by the motor controller are read.
The various state information of the motor controller comprises one or more state information of a target working mode, an actual working mode, a target torque, an actual rotating speed, a direct current bus voltage, a three-phase current of the motor and a temperature of the motor.
The fault extension information includes one or more of the number of times of occurrence of the fault and a state of a fault to be cleared counter.
The wireless communication transmission mode is a wireless Bluetooth communication mode.
The invention also discloses a wireless diagnosis device of the motor controller of the electric vehicle based on the UDS protocol, which comprises a client and a wireless communication module, wherein the client establishes a diagnosis communication mechanism with the ECU of the motor controller through the wireless communication module and based on the UDS unified diagnosis service rule of the CAN bus, reads the fault information and parameters stored in the internal storage area of the ECU and analyzes the fault information and parameters to perform fault troubleshooting.
As a further improvement of the above technical solution:
the client is a diagnostic instrument.
The wireless communication module is a wireless Bluetooth communication module.
The invention further discloses 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 diagnostic method as described above.
The invention further discloses a mobile media device comprising a processor and a memory, said memory having stored thereon a computer program which, when executed by the processor, carries out the steps of the diagnostic method as described above.
Compared with the prior art, the invention has the advantages that:
according to the electric vehicle motor controller wireless diagnosis method based on the UDS protocol, a communication mechanism is established between the UDS unified diagnosis service rule based on the CAN bus and the motor controller ECU, so that the whole communication mechanism has the characteristics of high speed, safety and comprehensive diagnosis service function; in addition, by combining a wireless communication technology, the wireless fault diagnosis method for the motor controller of the new energy electric vehicle is realized, the stored data in the motor controller can be read in a wireless communication mode, the read data is displayed through computer upper computer software or a mobile handheld diagnostic instrument, and the working efficiency of on-site after-sale service is greatly improved. In addition, the wireless Bluetooth communication mode is not influenced by external metal and the like, and the stability is good.
According to the wireless diagnosis method of the motor controller of the electric automobile, the UDS unified diagnosis service specification (ISO14229 protocol) is utilized, the wireless Bluetooth communication mode is combined, the motor controller fault information is read, the ECU can store the fault generated in the current driving period into the Flash data storage area in the ECU, the handheld diagnosis instrument (a tablet personal computer and a mobile phone) is used for directly reading the fault information stored in the ECU through the wireless Bluetooth data transmission mode, the diagnosis mode can be used for facilitating the on-site after-sales service personnel to quickly perform fault troubleshooting, and the after-sales service working efficiency is improved; meanwhile, the field technical service personnel can also use the wireless diagnosis equipment to realize the program flashing of the motor controller, and the efficiency of the program flashing work of the motor controller is improved.
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Fig. 1 is a block diagram of a diagnostic apparatus according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
As shown in fig. 1, in the UDS protocol-based wireless diagnosis method for a motor controller of an electric vehicle according to the present embodiment, a wireless bluetooth communication transmission manner is adopted, a UDS unified diagnosis service rule based on a CAN bus establishes a diagnosis communication mechanism with an ECU of the motor controller, reads fault information and parameters stored in an internal storage area of the ECU, and analyzes the fault information and parameters to perform troubleshooting. According to the electric vehicle motor controller wireless diagnosis method based on the UDS protocol, the UDS unified diagnosis service rule based on the CAN bus is communicated with the motor controller ECU, so that the whole communication mechanism has the characteristics of high speed, safety and comprehensive diagnosis service function; in addition, by combining a wireless communication technology, the wireless fault diagnosis method for the motor controller of the new energy electric vehicle is realized, the stored data in the motor controller can be read in a wireless communication mode, and the read data is displayed through computer upper computer software or a mobile handheld diagnostic instrument, so that the working efficiency of on-site after-sale service is greatly improved; in addition, the wireless Bluetooth communication mode is not influenced by external metal and the like, and the stability is good.
In this embodiment, one or more of the following five sub-services are wirelessly transmitted to realize reading of fault information in different modes: the five sub-services include: reading the number of faults; reading fault codes and states of faults according to the fault masks; reading fault snapshot information, namely various state information of the motor controller when a fault occurs, and assisting to determine the fault occurrence reason; reading fault extension information; all fault codes and states supported by the motor controller are read.
In this embodiment, the various state information of the motor controller includes one or more state information of a target operating mode, an actual operating mode, a target torque, an actual rotating speed, a dc bus voltage, a three-phase current of the motor, and a motor temperature of the motor controller. The fault propagation information includes one or more of the number of times the fault occurred and the status of the fault to be cleared counter.
The invention also discloses a wireless diagnosis device of the motor controller of the electric vehicle based on the UDS protocol, which comprises a client and a wireless communication module, wherein the client establishes diagnosis communication with the ECU of the motor controller through the communication module and the UDS unified diagnosis service rule based on the CAN bus, reads fault information and parameters stored in a storage area in the ECU and analyzes the fault information and parameters to perform fault troubleshooting. The wireless diagnosis device for the motor controller of the electric automobile based on the UDS protocol also has the advantages of the method, and is simple in structure, low in cost and easy to implement.
In the embodiment, the client is a tablet personal computer or a mobile phone, and is convenient to carry; the wireless communication module is a wireless Bluetooth communication module, and the stability is good.
The invention also discloses 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 diagnostic method as described above.
The invention further discloses a mobile media device comprising a processor and a memory, the memory having stored thereon a computer program which, when executed by the processor, carries out the steps of the diagnostic method as described above.
The invention is described in detail below with reference to a complete embodiment:
the fault diagnosis of the motor controller of the electric automobile mainly achieves the purpose of monitoring the working conditions of all components in the control system by utilizing an internal ECU (electronic control unit), and the ECU finds that a fault occurs after analysis and judgment and automatically starts a fault recording measure. Meanwhile, a fault diagnosis processing module in the ECU can store faults generated by the motor controller and can provide various operating parameters in the motor controller in real time, and external diagnosis equipment establishes a diagnosis communication mechanism with the ECU by using a UDS (universal data system) unified diagnosis service rule in a wireless communication transmission mode, reads fault information and parameters stored in a storage area in the ECU and analyzes the fault information and parameters for external after-sales service personnel to perform fault troubleshooting. The series of processing mechanisms form a three-dimensional diagnosis system of the motor controller of the pure electric vehicle, as shown in fig. 1.
Specifically, the functions realized by the wireless diagnosis are as follows:
(1) wireless mode for realizing data information storage and reading of motor controller
The motor controller needs to carry out processes such as single board debugging, complete machine debugging and the like before leaving a factory, and relevant debugging information needs to be written into the ECU in the debugging processes so that products can be traced in the future, a complete car factory can also require a supplier to write some relevant motor controller data according to the self requirement, and the writing of data information can be realized through transmission in a UDS wireless diagnosis mode.
In the process of diagnosing the motor controller of the electric automobile, a request instruction for reading a data stream in the UDS protocol is issued in a wireless diagnosis mode to obtain the internal state information of the ECU for on-site after-sales service personnel to diagnose and examine, such as the time of application program flashing, the serial number of upper computer software, vehicle configuration information, software and hardware version information, the ECU calibration state and the like. Reading version information and reading dynamic data streams requires the use of read data service requests in the UDS protocol, i.e. read data diagnostic services. The client side directly reads the data corresponding to the specified data identifier in the server by using a wireless diagnosis mode, the data identifier and the corresponding recorded data, namely the version information of a certain motor controller of the electric automobile can be analyzed, and meanwhile, the information is displayed on an operation interface of the diagnosis instrument in a wireless transmission mode.
When the data writing information needs to be realized, the diagnostic instrument can also issue a data writing service request in a wireless data transmission mode, namely, the data writing diagnostic service. The diagnosis upper computer can rewrite data corresponding to a specified data identifier in the server through the request service, and the diagnosis service can be used for realizing by writing in a VIN code of the whole vehicle. The UDS protocol provides that the diagnostic session mode of the automotive ECU needs to be switched to the extended session mode and the ECU needs to be unlocked before using the write data request service.
(2) Wireless updating of motor controller program
The motor controller is an important component in the electric automobile, and the main function is to control the torque and the rotating speed of the motor. In the development process of the motor controller, the control strategy is continuously adjusted, so that debugging, modification and upgrading of an application program are inevitable. The upper computer diagnostic instrument equipment sends a corresponding service request to an ECU (electronic control unit) in the motor controller according to a predefined program flashing flow through a wireless communication mode, so that the latest program can be flashed. Meanwhile, programming operation must pass through the security access, before downloading, the diagnostic instrument device obtains the seed and the secret key in a wireless data transmission mode, and after passing through the security access, only a legal diagnostic instrument can download the ECU. The upper computer CAN download the program by using an internally defined extended frame CAN communication ID1 or a standard frame communication ID2 distributed by a host factory, a download command is clicked, the upper computer sends a command requesting to enter a BootLoader updating program to the controller through wireless data transmission, the ECU program jumps to the BootLoader program to run after writing a programming request mark, and then the wireless diagnostic instrument sends a corresponding UDS service request to update the program according to a specified program flashing flow.
In order to ensure that the updating of the application program can be realized under the condition that the interference occurs to the controller to destroy the application program or the application program runs away, the wireless diagnostic equipment can also process the condition through an interception mode. If the lower computer receives the interception instruction sent by the wireless diagnostic equipment, the program stays in a BootLoader program in the ECU and waits for a programming instruction sent by the wireless diagnostic instrument of the next step.
(3) Wireless method for reading fault information of motor controller
According to the UDS unified diagnostic protocol, a control system on an automobile needs to record and process a fault according to a regularized diagnostic protocol, which is mainly embodied in a manner of diagnosing a fault code dtc (diagnostic control code). According to the protocol, each DTC is represented by a DTC content and a DTC state, wherein the DTC content represents information such as specific fault mode, fault mark and the like of the fault, for example, the motor controller has hardware overcurrent fault.
Since the UDS protocol specifies that a fault information reading service request needs to be invoked when reading fault information, and this service is also the most important service of the UDS diagnostic service, its function is to read the relevant fault information stored by the motor controller according to the fault diagnosis policy. Therefore, the wireless diagnosis equipment can wirelessly transmit five different sub-services to realize the reading of the fault information under different modes according to the specific requirements of the motor controller: reading the number of faults; reading fault codes and states of faults according to the fault mask; reading fault snapshot information, namely various state information of the motor controller when a fault occurs, wherein the state information mainly comprises a target working mode, an actual working mode, a target torque, an actual rotating speed, a direct-current bus voltage, a three-phase current of the motor, a temperature of the motor and the like of the motor controller, and the fault occurrence reason can be determined in an auxiliary manner; fourthly, reading fault expansion information including the occurrence frequency of the fault, the state of a counter to be cleared of the fault and the like; reading all fault codes and states supported by the motor controller. Meanwhile, after the motor controller completes maintenance and determines the fault reason, the wireless diagnosis equipment can clear all or single fault codes by calling fault information clearing service.
(4) Wireless implementation of motor controller routine control
The internal ECU of the motor controller may initiate a function in the software, such as erasing an ECU data storage area routine, initiating a CRC check, etc., via a routine control service request in the UDS protocol standard, each custom function being identified by a unique routine identifier. Therefore, the routine function of the motor controller can be started by issuing a starting routine instruction by the upper wireless diagnosis computer.
When the routine control function is started by using the wireless diagnostic equipment, the control parameters required to be sent in the control routine can be filled in the wireless diagnostic equipment, then the routine is started, the wireless diagnostic equipment sends the parameters required to be controlled, and meanwhile, the controller returns a positive response to the upper computer after starting the corresponding function; clicking the request result, the wireless diagnosis equipment issues a request result service parameter instruction, and the controller returns a result value to the upper computer; clicking on the end routine, the wireless diagnostic device will operate the motor controller and will exit the current control routine.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (10)
1. A wireless diagnosis method for an electric vehicle motor controller based on a UDS protocol is characterized in that a wireless communication transmission mode is adopted, a diagnosis communication mechanism is established between a UDS unified diagnosis service rule based on a CAN bus and an ECU of the motor controller, fault information and parameters stored in a storage area inside the ECU are read, and the fault information and the parameters are analyzed to perform fault troubleshooting.
2. The UDS-protocol-based wireless diagnosis method for the motor controller of the electric vehicle is characterized in that one or more of the following five sub-services are wirelessly transmitted to realize reading of fault information in different modes: the five sub-services include: reading the number of faults; reading fault codes and states of faults according to the fault masks; reading fault snapshot information, namely various state information of the motor controller when a fault occurs, and assisting to determine the fault occurrence reason; reading fault extension information; all fault codes and states supported by the motor controller are read.
3. The UDS-protocol-based wireless diagnosis method for the motor controller of the electric vehicle according to claim 2, wherein the various state information of the motor controller comprises one or more state information of a target operation mode, an actual operation mode, a target torque, an actual rotating speed, a direct-current bus voltage, a three-phase current of the motor and a temperature of the motor.
4. The UDS-protocol-based wireless diagnosis method for the motor controller of the electric vehicle according to claim 2, wherein the fault extension information comprises one or more of the number of occurrences of a fault and the status of a fault to be cleared counter.
5. The UDS-protocol-based wireless diagnosis method for the motor controller of the electric vehicle according to any one of claims 1 to 4, wherein the wireless communication transmission mode is a wireless Bluetooth communication mode.
6. The wireless diagnosis device is characterized by comprising a client and a wireless communication module, wherein the client establishes a diagnosis communication mechanism with an ECU of the motor controller through the wireless communication module and based on a UDS unified diagnosis service rule of a CAN bus, reads fault information and parameters stored in a storage area inside the ECU, and analyzes the fault information and parameters to perform fault troubleshooting.
7. The UDS-protocol-based wireless diagnosis device for the motor controller of the electric automobile according to claim 6, wherein the client is a mobile handheld diagnostic apparatus.
8. The UDS-protocol-based wireless diagnosis device for the motor controller of the electric vehicle according to claim 6, wherein the wireless communication module is a wireless Bluetooth communication module.
9. 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 diagnostic method as claimed in any one of claims 1 to 5.
10. A mobile media device comprising a processor and a memory, said memory having stored thereon a computer program, characterized in that the computer program realizes the steps of the diagnostic method according to any one of claims 1 to 5 when executed by the processor.
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