CN103455025B - A kind of vehicle fault diagnosis system based on Android platform - Google Patents
A kind of vehicle fault diagnosis system based on Android platform Download PDFInfo
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Abstract
The present invention provides a kind of vehicle fault diagnosis system based on Android platform, including electronic control unit ECU, CAN, also include data conversion module, vehicle failure decoder module and vehicle failure analysis expert module, described data conversion module one end is connected with CAN, the other end and bluetooth module wireless connection, the bluetooth module is connected with vehicle failure decoder module, and the vehicle failure decoder module is connected with vehicle failure analysis expert module；Present invention reduction automobile failure diagnosis cost, makes diagnosis process more facilitate, improves auto repair efficiency.
Description
Technical field
The present invention relates to vehicle electric field, specially a kind of vehicle fault diagnosis system based on Android platform.
Background technology
Existing vehicle fault diagnosis system, the DTC in automobile ECU can be read, show, store and handle, energy
It is enough easy, detect vehicle failure exactly, be conducive to automobile operating state detection and vehicle failure maintenance.Current country's peripheral hardware
The automobile fault diagnostic apparatus scheme of meter mainly has two kinds：Failure diagnostic apparatus based on PC and based on single-chip microcomputer/FPGA（Field
Programmable Gate Array, i.e. field programmable gate array）Hand-held failure diagnostic apparatus.Both schemes it is hard
Part cost is all higher, and the diagnostic equipment based on PC is inconvenient to carry, even if passing through automobile in view of maintenance personal in addition
Failure diagnostic apparatus has been diagnosed to be the failure of automobile appearance, but is intended to judge failure cause exactly, in addition it is also necessary to inquiry maintenance
The data such as handbook, cause in maintenance process auto repair personnel to take a significant amount of time and consult reference materials, operating efficiency is than relatively low.
In order to which the outgoing operation for the diagnostic equipment for solving to be currently based on PC is inconvenient to carry and based on the hand-held of single-chip microcomputer/FPGA
The higher deficiency of the hardware cost of formula diagnostic equipment.Chinese Patent Application No. is：201310023184.9 Chinese invention patent carry
A kind of utilization mobile terminal is supplied（Mobile phone/flat board）The method that fault diagnosis is carried out to automobile, described method includes following step
Suddenly：Slave computer is connected by diagnosing interface with automobile electronic control unit, the signal in collection automobile electronic control unit；User utilizes upper
Position machine（Mobile terminal）To show the data of slave computer transmission, and instruction, host computer are sent to slave computer, automobile electronic control unit
Wirelessly transmission receives signal between slave computer.Utilization mobile terminal described in the patent reads automobile fault code
To help the technology that maintenance personal finds failure cause to there is following drawback：
The DTC that designed automobile fault diagnostic apparatus can only be read in automobile ECU is shown, it is contemplated that vapour
Limited information and the otherness of auto repair personnel specialty knowledge and experience that car failure diagnostic apparatus is obtained from ECU, common
Even if maintenance personal has been diagnosed to be what failure automobile occurs in that by automobile fault diagnostic apparatus, but is intended to judge exactly
Failure cause, in addition it is also necessary to inquire about the data such as servicing manual, causes in maintenance process auto repair personnel to take a significant amount of time and looks into
Data, operating efficiency is than relatively low.
Therefore, Assistance And Instruction auto repair personnel and offer are come invention introduces Perspectives of Automotive Fault Diagnosis Expert System
Policy-making suggestion.Chinese Patent Application No. is：201210499356.5 Chinese invention patent provide it is a kind of based on maintenance money
The Diagnosis method of automobile faults of material and expert system, described method comprises the following steps：Set up the vapour based on internet
Car repair information database, creates an expert system, by automobile fault diagnostic apparatus and automobile on the webserver
Seat connection is diagnosed, the data in automobile ECU is read and is packaged into real time data, be sent to the repair information positioned at the webserver
In database, server is transferred according to real time data to be sent to vehicle failure by network again after corresponding repair information data and examines
Disconnected instrument；When starting expert's function of automobile fault diagnostic apparatus, content that network expert system can be in knowledge base,
Real time data infers diagnostic result, then is sent to automobile fault diagnostic apparatus by network.Described in the patent based on maintenance
There is following drawback in the technology of the Diagnosis method of automobile faults of data and expert system：
1. diagnosis process has to rely on network, it is only suitable for using in the place for having the network coverage, if workplace does not have
The network coverage, it will cause automobile fault diagnostic apparatus to use, is restricted the portability of automobile fault diagnostic apparatus；
2. needing the server of a stable operation to support all handheld terminal normal works, it is only suitable in maintenance factory
Use, if there is phenomenons such as network failure or server failures, automobile fault diagnostic apparatus will be caused to use, and
Add system cost；
3. needing to design a special handheld terminal, use cooperatively, read for DTC and server with server
Communication, fault message are shown, are added hardware cost and development difficulty, are caused diagnostic equipment high expensive.
The content of the invention
The deficiency of the prior art for more than, reduces diagnostic equipment cost it is an object of the invention to provide one kind, makes to examine
Disconnected process more facilitates, and the vehicle fault diagnosis system of auto repair efficiency is improved, to reach above-mentioned purpose, technology of the invention
Scheme is：
A kind of vehicle fault diagnosis system based on Android platform, including Android phone or tablet personal computer, setting
Electronic control unit ECU in automotive interior network, the controller local area network being connected with the electronic control unit ECU
Also include vehicle failure decoder module and automobile event in CAN, in addition to data conversion module, Android phone or flat board
Hinder analysis expert module；
The data conversion module is connected by bus with controller local area network's CAN of automotive interior network internal
Connect, with the bluetooth module wireless connection in Android phone or tablet personal computer also by way of bluetooth communication；
Vehicle failure decoder module connection in the Android phone or tablet personal computer, the vehicle failure decodes mould
Block is connected with vehicle failure analysis expert module；
Start vehicle failure decoder module and vehicle failure analysis expert mould in the Android phone or tablet personal computer
Block, the vehicle failure decoder module generates automobile failure diagnosis request message, and radios to data by bluetooth module
The automobile failure diagnosis request message sent is converted into controller local area network's CAN numbers by modular converter, data conversion module
The electronic control unit ECU is transferred to according to frame request message and by CAN, the electronic control unit ECU responses please
Ask and produce response message, response message is sent into data conversion module by controller local area network's CAN is converted into
Bluetooth data frame request message, vehicle failure decoder module is transferred to by bluetooth module, and vehicle failure decoder module is parsed
The DTC of response message is simultaneously transferred to vehicle failure analysis expert module, and Fault diagnosis expert analysis module is carried out to DTC
Inquire about and show that fault category is advised with maintenance.
Further, the vehicle failure code decoding module includes diagnostic function selecting module, UDS diagnostic services, XML
Diagnostic data base, XML parser, the diagnostic categories that the diagnostic function selecting module is used to treat diagnosis vehicle are selected,
And call UDS to diagnose message generator generation diagnosis request message according to diagnostic categories, it is sent to Vehicle Electronic Control Unit
ECU, electronic control unit ECU send response message to XML parser, and XML parser call XML diagnostic data base is reported to response
Text is parsed, and is drawn DTC and is transferred to Fault diagnosis expert analysis module.
Further, the vehicle failure analysis expert module includes reasoning diagnostic module and the reasoning diagnosis rule that are stored with
Knowledge base then, the reasoning diagnostic module receives the event that the XML parser from vehicle failure code decoding module is sent
Hinder code, and call the corresponding Knowledge of Maintenance of the DTC in knowledge base, show that fault category is advised with maintenance.
Advantages of the present invention and have the beneficial effect that：
The present invention proposes a kind of vehicle fault diagnosis system based on Android platform, and this system is existing to be based on PC
The reasoning of expert system, diagnostic function, the outgoing operation for also having the hand-held diagnostic equipment scheme based on single-chip microcomputer/FPGA carries
The advantages of facilitating.Because vehicle fault diagnosis system is based on mobile terminal design so that its applicable crowd is more extensive, and
And the link and cost of hardware design are saved, user only needs to install diagnosis application journey on the mobile phone or flat board of oneself
Sequence, can just make the mobile phone or flat board of oneself become the automobile fault diagnostic apparatus of specialty, make that diagnostic equipment cost is lower, system maintenance more
Plus simple, diagnosis process more facilitates.In addition Perspectives of Automotive Fault Diagnosis Expert System is incorporated on Android platform in the present invention, made
Failure cause must be searched more to facilitate, and reduce the requirement to user, compared with existing " cloud diagnosis " mode, the system
Diagnosis process do not need server, independent of network, independence and applicability are stronger.
Brief description of the drawings
Fig. 1 is the system block diagram of vehicle fault diagnosis system of the preferred embodiment of the present invention based on Android platform；
Fig. 2 is the structured flowchart of vehicle failure decoder module；
Fig. 3 is the workflow diagram of vehicle failure decoder module；
Fig. 4 is the structured flowchart of vehicle failure analysis expert module；
Fig. 5 is the workflow diagram of vehicle failure analysis expert module.
Embodiment
Providing a non-limiting embodiment below in conjunction with the accompanying drawings, the invention will be further elaborated.
The present invention provides a kind of vehicle fault diagnosis system based on Android platform, the present invention by mobile terminal come
The DTC in automobile ECU is read, and is out of order Producing reason using vehicle failure analysis expert module reasoning, present invention solution
Certainly it is currently based on the hardware of the outgoing operation hand-held diagnostic equipment inconvenient to carry and based on single-chip microcomputer/FPGA of the diagnostic equipment of PC
Cost is higher, system maintenance and the cumbersome deficiency of upgrading, and improves the operating efficiency of auto repair personnel.
It is as shown in Figure 1 the system block diagram of the present invention：
Mobile terminal 1, supports the Android phone or flat board of Bluetooth function, for running automobile failure diagnosis application journey
Sequence（APP）；
Human-computer interaction module 2, is the touch display screen of mobile terminal, and user can check that automobile is believed by touch display screen
Breath, and relevant information can be inputted to system；
Vehicle failure decoder module 3, reads and parses for automobile fault code, can read DTC in automobile ECU,
Remove DTC, read dynamic dataflow, write-in VIN codes；
Vehicle failure analysis expert module 4, for reasoning Trouble cause, according to vehicle failure decoder module from ECU
The DTC inside read, with reference to knowledge base, makes inferences according to certain rule, finally draws a conclusion；
Bluetooth module 5, is the bluetooth module that mobile terminal is carried, the system is by bluetooth module come transceiving data；
Automotive interior network 6, the multiple ECU of automotive interior are mainly connected by CAN, are mainly included：
BCU61, battery management unit；
HCU62, entire car controller；
IPU63, integrated combination power set；
Data conversion module 7, on the one hand for receiving order that mobile terminal sends and convert thereof into CAN data frame lattice
Formula, is sent to automobile ECU, on the other hand receives the CAN message of automobile ECU and it is sent into mobile terminal by bluetooth.
A non-limiting embodiment of the invention is：Such as Freescale S12 series ECU, as long as operation UDS in ECU
Service, it is possible to diagnosed by the system；
Data conversion module 7, mainly by serial ports bluetooth module（HC05）, microcontroller（STM32）, CAN communication circuit
（TJA1050）Three parts are constituted, and can complete the data conversion between CAN and bluetooth.
As shown in Fig. 2 present embodiments providing a kind of automobile fault code parsing module based on Android platform, the mould
Block mainly includes：
Human-computer interaction module 2, for information required during acquisition diagnosis, and shows diagnostic result；
Vehicle failure analysis expert module 4, receives the DTC that failure decoder module is sent, and the failure to receiving
Code makes inferences, and helps user to find the reason for failure occurs；
Data conversion module 7, for receiving the order of diagnostic equipment transmission and being converted into standard CAN message, enters with automobile ECU
Row communication, reads the DTC in ECU, and ECU response message is transmitted into mobile terminal by bluetooth；
XML diagnostic data bases 81, the failure code table defined according to each depot（DTC and fault message corresponding table）, use
XML language fills in a DTC in a line XML statement with corresponding fault message, successively by failure code table
Hold and be all filled up to XML language in storage Trouble Match information txt file, for being parsed to the DTC read；
Diagnostic function selecting module 82, the specific vehicle of selection diagnosis object, the diagnostic function carried out for the vehicle, bag
Include：Read failure code, removing DTC, reading dynamic dataflow, write-in VIN codes；
XML parser 83, after diagnostic equipment receives response message, calls parsing traffic flow information algorithm, from SD card
The related information of the data stored in XML file is inquired about, so as to parse and calculate the information corresponding to data flow, and is shown
Final result；
UDS diagnostic services 84, for unified diagnostic service, diagnostic equipment is by calling UDS diagnostic services to automotive interior ECU
（Mainly include BCU, HCU and IPU）Send diagnostic service request message；
Bluetooth communication 85, for being communicated with data conversion module, transmission mobile terminal send order and
Receive the response data of data conversion module.
As shown in figure 3, this example provides a kind of Diagnosis method of automobile faults based on Android platform.When user exists
, it is necessary to first be attached mobile phone/flat board and data conversion module before carrying out vehicle diagnosis function, corresponding car is then selected
Type, part, read failure information, this method comprise the following steps：
S11：User selects the function of " connection equipment " in diagnostic equipment main interface；
The step is specially：Data conversion module is inserted on automobile OBD interfaces by user first, then in mobile terminal
（Mobile phone/flat board）It is upper that the automobile failure diagnosis application program that the present invention is provided is installed（APP）, the application program is run, into event
Hinder the main interface of diagnostic program.
S12：Bluetooth of mobile phone is opened to be matched；
The step is specially：" connection equipment " function is selected, system can prompt the user whether opened bluetooth function, selected
" it is determined that ", system can search for neighbouring bluetooth equipment automatically, find data conversion module, choose the equipment to be attached, and input
Password is matched, for example, the data conversion module of entitled " Diagnosis " is chosen in the bluetooth equipment searched, connection
The equipment, system can point out user to input password, input " 12345 "（The passwords of acquiescence）Matched.
S121：System can point out user " successful connection " after successful connection, and the shape of connection is shown in diagnostic equipment main interface
State（Including：" successful connection ", " connection failure again attempts to connection ", " attempting connection time-out, abandon connection "）.
S13：Select corresponding car category；
The step is specially：User selects " vehicle diagnosis " function in diagnostic equipment main interface, and system jumps to the choosing of car system
Interface is selected, in car system selection interface, system reads car system file and resolution file content from SD card, complete to parse work
Afterwards, the car system title of support is shown in car system selection interface, such as user can select " Chinese car in car system selection interface
System ", the car system selected according to user is jumped to depot's selection interface by system, in depot's selection interface, is read from SD card
Depot's file and resolution file content, after parsing work is completed, show depot's title of support, example in depot's selection interface
As user can select " Chang'an " in depot's selection interface, depot of the system according to selected by user jumps to Truck type choice circle
Face, then user is according to oneself corresponding car system of actual type of vehicle selection, and such as user can be in car system selection interface
" Chang'an jumps to subassembly selection interface to mini " and then system for middle selection；
S14：Select corresponding automobile component；
The step is specially：In subassembly selection interface, system reads component files and parsed from SD card, completes solution
Analyse after work, the component names supported in subassembly selection interface display, the part that user supports according to oneself automobile model（Mainly
Including：BCU, HCU and IPU）, respectively all parts can be carried out with fault diagnosis, such as user's selection " BCU respectively（Battery control
Unit processed）" option, jump to diagnostic function selection interface.
S15：Select corresponding diagnostic function；
The step is specially：In diagnostic function selection interface, we see to see the diagnostic function of this part support, example
BCU as selected before user includes：Read whole DTCs, read version information, remove DTC, read dynamic dataflow,
VIN codes are write, current failure code is read and read historical failure yard totally 7 diagnostic functions, system is by examining according to selected by user
Disconnected function jumps to corresponding diagnostic result display interface, is then sent by the bluetooth of mobile phone/flat board to data conversion module
Diagnostic service request message, data conversion module is received after data to the corresponding diagnostic service request message of automobile ECU transmission；
Automobile ECU is serviced according to request, respond request, and sends response message to data conversion module, data conversion by CAN
Module is received after data, then by bluetooth response message is sent to the bluetooth of mobile phone/flat board；Diagnostic result display interface,
According to the response message of automobile ECU, corresponding UDS diagnostic services analytical algorithm is called, the data of response message are parsed, and shown
Diagnostic message is shown, so as to complete the fault diagnosis functions to automobile ECU.
S151：DTC function is removed, user is clicked on after this diagnostic function, all DTCs of ECU storages, bag will be removed
Include current and historical failure code.
S152：Read failure code is parsed and shown, user is clicked on after this diagnostic function, will read all events of ECU storages
Hinder code, including current and historical failure code.
S153：Dynamic dataflow function is read, after dynamic dataflow function is read in selection, diagnostic equipment will be read in ECU
The real-time vehicle operating parameter of storage.
As shown in figure 4, the present embodiment additionally provides a kind of vehicle failure expert analyzing system, Eclipse is used
Java EE IDE for Web Developers development environments, the APK file directly generated after compiling, it is possible to mounted in hand
Run on machine.The system mainly includes：
Knowledge base 8, for depositing the information such as the rule needed for reasoning, including Conventional wisdom and exclusive empirical of expert are known
Know, be the set of expert's domain knowledge, the SQLite that is carried using Android system carries out storage and maintenance；
Reasoning diagnostic module 9, the reasoning diagnostic module 9 includes：
Inference machine 91, is the organizational controls mechanism of expert system, using the rule stored in knowledge base, using forward reasoning
Strategy, is set out the reasoning to conclusion direction from initial data, finally drawn a conclusion, for example, carry out fault diagnosis to electrokinetic cell
When, inference machine is successively read the use state data of each battery in dynamic data base, and uses the battery in knowledge base successively
Symptom membership function calculates each symptom degree of membership a corresponding to the battery status data, then carries out fuzzy operation, obtains
To the failure degree of membership of battery, battery failure degree and battery health are finally calculated, battery failures information is confirmed；
Dynamic data base 92, be inference machine dynamically read knowledge base in information and diagnosis during produce some in
Between data, including assembled battery total voltage, total current, dump energy, battery temperature etc.；
Diagnostic result 93, the result that storage inference machine is obtained；
Knowledge processing module 10, the knowledge processing module 10 includes：
Knowledge acquisition module 101, the main Heuristics that domain expert is described using production rule and storage are to knowing
Know in database；
Knowledge base maintenance module 102, mainly solves the maintenance issues to knowledge base, including the addition to knowledge, modification, more
It is new to wait operation.
On the basis for reading automobile ECU internal fault code described in Fig. 2, additionally provide one kind and utilize vehicle failure expert
The method that analysis module makes inferences to DTC Producing reason, instructs user to find the reason for failure occurs step by step.
Specific flow is as shown in figure 5, this method includes：
S21：Obtain DTC；
The step is specially：User is read after automobile fault code, enable inference function, and failure diagnostic apparatus will be parsed
DTC is sent to fault diagnosis expert system；
S22：The phenomenon produced for failure code acquisition user correspondence failure, by man-machine interaction, obtains relevant information；
S23：Inference machine is inquired about and retrieval fault category from knowledge base；
S24：Fault category in contrast current failure and knowledge base；
S25：Whether current failure phenomenon matches with the fault category in knowledge base；
S251：Match fault category, it was therefore concluded that, and provide related advisory；
S252：If not finding the fault category of matching, continue to inquire user malfunction information.
The above embodiment is interpreted as being merely to illustrate the present invention rather than limited the scope of the invention.
After the content for the record for having read the present invention, technical staff can make various changes or modifications to the present invention, these equivalent changes
Change and modification equally falls into the scope of the claims in the present invention.
Claims (2)
1. a kind of vehicle fault diagnosis system based on Android platform, including it is arranged at the electronics control of automotive interior network (6)
Unit ECU processed, the controller local area network's CAN being connected with the electronic control unit ECU, it is characterised in that：Also wrap
Include data conversion module (7), be arranged at Android phone or the vehicle failure decoder module (3) on flat board (1) and vehicle failure
Analysis expert module (4)；
Described data conversion module (7) one end controller local area network CAN internal with automotive interior network (6) is connected
Connect, the other end and bluetooth module (5) wireless connection in Android phone or flat board (1), the bluetooth module (5) and automobile
Failure decoder module (3) is connected, and the vehicle failure decoder module (3) is connected with vehicle failure analysis expert module (4)；
The vehicle failure decoder module (3) generates automobile failure diagnosis request message, and is wirelessly transferred by bluetooth module (5)
Data conversion module (7) is given, the automobile failure diagnosis request message sent is converted into controlling general ability by data conversion module (7)
Domain network C AN data frames request message is simultaneously transferred to the electronic control unit ECU, the Electronic Control list by CAN
First ECU respond requests simultaneously produce response message, and response message is sent into data conversion by controller local area network's CAN
Module (7) is converted into bluetooth data frame request message, and vehicle failure decoder module (3), automobile are transferred to by bluetooth module (5)
Failure decoder module (3) parses the DTC of response message and is transferred to vehicle failure analysis expert module (4), vehicle failure
Analysis expert module (4) is inquired about DTC and show that fault category is advised with maintenance；
The vehicle failure decoder module (3) includes diagnostic function selecting module, UDS diagnostic services, XML diagnostic data bases, XML
Resolver, the diagnostic categories that the diagnostic function selecting module is used to treat diagnosis vehicle are selected, and according to diagnostic categories
Call UDS diagnostic services to produce diagnosis request message, be sent to Vehicle Electronic Control Unit ECU, electronic control unit ECU is sent
Response message is parsed to XML parser, XML parser call XML diagnostic data base to response message, draws DTC simultaneously
It is transferred to Fault diagnosis expert analysis module；
The vehicle failure analysis expert module includes reasoning diagnostic module and the be stored with knowledge base of reasoning diagnosis rule, institute
State reasoning diagnostic module and receive the DTC that the XML parser from vehicle failure decoder module (3) is sent, and call knowledge
The corresponding Knowledge of Maintenance of DTC in storehouse, show that fault category is advised with maintenance；
The reasoning diagnostic module includes：Inference machine, is the organizational controls mechanism of expert system, utilizes the storage in knowledge base
Rule, using forward reasoning strategy, is set out the reasoning to conclusion direction from initial data, finally drawn a conclusion；
Dynamic data base, is that inference machine dynamically reads some mediants produced during information and diagnosis in knowledge base
According to, including assembled battery total voltage, total current, dump energy, battery temperature；
Diagnostic result, the result that storage inference machine is obtained；
Knowledge processing module, the knowledge processing module includes：
Knowledge acquisition module, the main Heuristics that domain expert is described using production rule is simultaneously stored to knowledge data base
In；Knowledge base maintenance module, mainly solves the maintenance issues to knowledge base, including the addition to knowledge, modification, renewal operation.
2. the vehicle fault diagnosis system according to claim 1 based on Android platform, it is characterised in that：Also have
The human-computer interaction module (2) being connected respectively with vehicle failure decoder module (3) and vehicle failure analysis expert module (4).
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