CN101446830A - Vehicle fault diagnosis instrument and fault diagnosis method - Google Patents
Vehicle fault diagnosis instrument and fault diagnosis method Download PDFInfo
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- CN101446830A CN101446830A CNA2008102461613A CN200810246161A CN101446830A CN 101446830 A CN101446830 A CN 101446830A CN A2008102461613 A CNA2008102461613 A CN A2008102461613A CN 200810246161 A CN200810246161 A CN 200810246161A CN 101446830 A CN101446830 A CN 101446830A
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- 238000001514 detection method Methods 0.000 claims description 4
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- 238000005516 engineering process Methods 0.000 description 10
- 238000012423 maintenance Methods 0.000 description 6
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Abstract
The invention relates to a vehicle fault diagnosis instrument and a fault diagnosis method. The vehicle fault diagnosis method comprises the following steps: a vehicle-borne diagnosis instrument module sends diagnostic fault code service read in state; the service is sent to all relevant controllers through a vehicle gateway, and the controllers transmit the diagnostic fault codes to the vehicle-borne diagnosis instrument module after receiving the information; the vehicle-borne diagnosis instrument module is used for storing the fault information according to different address markers and reminds the drivers on a display module; and the vehicle-borne diagnosis instrument module detects all the diagnostic fault codes in the storage space and sends the safety level information of the fault codes to the network.
Description
Technical field
The present invention relates to the automotive automation field, especially network communication and On-Board Diagnostics (OBD) field.
Background technology
Along with the develop rapidly of automotive electronic technology, more and more electronics applications to improve comfortableness, the operational stability of car, reduce aspects such as noise, the low oil consumption of safety and health in automobile.At present external automotive electronics widespread usage on automobile, it accounts for the car load price ratio and reached 60%-70% in some luxury car.
Applying of electronic product makes that the fault detection technique of automobile and fault diagnosis technology are also just growing, and the development of these fault detection techniques and fault diagnosis technology provides great convenience for the maintenance and the maintenance of automobile.But shortcoming is exactly present car owner oneself can not utilize these diagnostic functions to go to understand the situation of own car, in time repair the love car of maintenance oneself, and need remove Auto repair shop or after-sale service station, the maintenance personal in service station uses diagnostic equipment to repair automobile easily.The car owner but can't use diagnostic equipment, can only judge whether car has fault by each system failure pilot lamp on the instrument panel, yet only relying on the malfunction indicator lamp on the instrument to judge whether each electronic control unit has fault, concerning driver and crew, is far from being enough.Pilot lamp Chang Liang on instrument panel, car owner only know that there is fault in this system, specifically are what faults, can not influence comfortableness or security, the especially security of driving, and the car owner does not understand.The more important thing is at present to such problem, what measure is the The whole control system of automobile do not make, to prevent and may take place the disadvantageous accident of driver and crew.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of novel, reliable Auto analyzer and diagnostic method are provided, and the state of pointing out car load for just under steam driver and crew, and make safety prevention measure according to vehicle failure, to guarantee driver and crew's safety.
Described vehicle diagnosis instrument system comprises: electronic control unit corresponding to the different operational module of automobile, has the diagnostic trouble code (DTC) of disparate modules; The vehicle-borne diagnosis instrument module, be used to read and store the diagnostic trouble code (DTC) of each electronic control unit, and vehicle failure and description thereof sent to display module, send the failure safe class information to network simultaneously, control device on the network is made safety prevention measure according to the failure safe class information; Display module is used to show and point out the fault and the description of user's automobile.
Preferably, described vehicle diagnosis instrument system comprises the On-Board Diagnostics (OBD) bus, is used for detection system, Data transmission between electronic control unit ECU.
Preferably, described On-Board Diagnostics (OBD) bus comprises K radiodiagnosis x and/or CAN bus.
Preferably, described vehicle diagnosis instrument system comprises the network communication module, and exchange message between vehicle electronics control module ECU forms the Vehicle Electronic Control network.
Preferably, described vehicle diagnosis instrument system comprises automobile gateway, is used for the information between the variant sub-network is changed mutually, realizes the communication between heterogeneous networks.
Preferably, the vehicle-borne diagnosis instrument module reads the diagnostic trouble code (DTC) that the current existence of each electronic control unit is read in the diagnostic trouble code (DTC) service by state.
Preferably, vehicle-borne diagnosis instrument is distinguished the tracing trouble information of different ECU (Electrical Control Unit) by address information, is stored in the different spaces.
Preferably, there is the failure safe class information in the vehicle-borne diagnosis instrument storage space: 1 slight fault, 2 general faults, 3 serious very serious faults of fault, 4.
Preferably, 1 grade or 2 grades of faults, not having the safety practice of pressure applies, 3 grades, 4 grades faults, on network, there is such failure safe class information, engine management system and automatic gear-box control module meeting limiting engine rotating speed also limit the intention that the driver changes high-grade speed-raising, and the speed of a motor vehicle is limited in 30Km/H and 10Km/H respectively.
Described automobile failure diagnosis method has following steps:
(1) the vehicle-borne diagnosis instrument module sends and reads the diagnostic trouble code (DTC) service by state;
(2) above-mentioned service is issued each correlation control unit by automobile gateway, after controller is received information, diagnostic trouble code (DTC) is sent to the vehicle-borne diagnosis instrument module by gateway;
(3) vehicle-borne diagnosis instrument is according to different address designator storage failure information, and points out driver and crew on display module;
(4) vehicle-borne diagnosis instrument is checked all diagnostic trouble code (DTC) in its storage space, and the failure code safety level information is dealt on the network.
Preferably, in step (4), vehicle-borne diagnosis instrument is dealt into the highest information of failure code safe class on the network, after other controllers on the network receive this information, can make corresponding safety prevention measure.
Whether preferably, driver and crew can select to read fault, thereby understand present system which fault are arranged, influence to drive or safety.
Compare with present prior art, the present invention is by using the vehicle-borne diagnosis instrument module, and adopted new method for diagnosing faults, make vehicle can be more intuitively to the driver show automobile storage fault and possible potential safety hazard, and the size of the hidden danger that can may cause according to fault, take different safety prevention measures, to guarantee driver and crew's safety.
Description of drawings
Fig. 1 is an Auto analyzer grid topological diagram of the present invention;
Fig. 2 is a vehicle diagnosis method step process flow diagram of the present invention.
Each component names among the figure
DLC: data link joint ECU: electronic control unit
Embodiment
The innovative point of this patent is: utilize vehicle-borne diagnosis instrument to read the failure message of each electronic control unit of car load, storage also shows diagnostic trouble code (DTC) and description, points out the state of car load to driver and crew just under steam; Send the failure safe class information to network simultaneously, the electronic control unit on the network is made safety prevention measure according to the failure safe class information, to guarantee driver and crew's safety.
For example: when the fault of ABS disabler takes place, there is great potential safety hazard in this fault, after existing so launched machine management system of failure safe class information and automatic gear-box control module to receive on the network, the rotating speed of engine management module meeting limiting engine, the automatic gear-box control module can limit the high-grade speed-raising intention of changing of human pilot, the speed of a motor vehicle is controlled in the scope of 10Km/H, remind the car owner to advance maintenance station or maintenance depot's place under repair as early as possible, cruising is recovered in the back of fixing a breakdown.
The art of this patent relates to aspects such as car load network communication, On-Board Diagnostics (OBD) and automobile gateway, describes in detail below in conjunction with accompanying drawing 1.
Network communications technology, just as the usefulness of the electronic control unit communication in the automotive environment, exchange message between vehicle electronics control module ECU forms the Vehicle Electronic Control network during network communications technology initial designs.
The On-Board Diagnostics (OBD) technology, developing by leaps and bounds of automotive electronic technology brings vehicle diagnosis The Application of Technology and progress, and current vehicle diagnosis technology is constantly progressive.The K radiodiagnosis x is one of diagnostic-type the earliest, has complied with the megatrend of In-vehicle networking development at present based on the diagnostic techniques of CAN bus, will progressively replace the K radiodiagnosis x, becomes one of main flow of On-Board Diagnostics (OBD) of future generation.
Automobile gateway needs to exchange information between numerous electronic control units, and the effect of gateway is changed the information between the variant sub-network mutually, realizes the communication between heterogeneous networks.As: the LIN network signal is changed into the CAN network signal.
Vehicle-borne diagnosis instrument has been inherited the diagnostic trouble code (DTC) that the diagnostic equipment function also could read and store other electronic control units, and can show the electronic control unit of fault and description on display screen.
To use Diagnosis Service in the diagnosis communication implementation procedure.What this functional configuration was mainly used is to read diagnostic trouble code (DTC) (Read Diagnostic Trouble Code By Status) by state.The service identifier that reads diagnostic trouble code (DTC) by state is 18, and the form of write data Service Diagnostic communication request order is as shown in the table:
Table one reads the form of diagnostic trouble code (DTC) by state
In this patent, the physical record identifier that reads the diagnostic trouble code (DTC) service by state is the diagnostic trouble code (DTC) (numerical value is 0x00) that reads current existence.
| Data byte | Parameter name | Agreement | Numerical value |
| #1 | Read diagnostic trouble code (DTC) service positive response service identifier by state | M | 58 |
| #2 | The quantity of diagnostic trouble code (DTC) | M | xx |
| #3 : : : | Diagnostic trouble code (DTC) and state inventory thereof=[the state #1 of diagnostic trouble code (DTC) #1 (high byte) diagnostic trouble code (DTC) #1 (low byte) diagnostic trouble code (DTC): | C | xx xx xx : xx |
| : #n | The state #m of diagnostic trouble code (DTC) #m (high byte) diagnostic trouble code (DTC) #m (low byte) diagnostic trouble code (DTC)] | xx xx |
Table two reads diagnostic trouble code (DTC) positive response information by state
Electronic control unit receive that vehicle-borne diagnosis instrument sends read diagnostic trouble code (DTC) (ReadDiagnostic Trouble Code By Status) request after, will to send to the requesting party be vehicle-borne diagnosis instrument being stored in diagnostic trouble code (DTC) in the electronic control unit storage space, after vehicle-borne diagnosis instrument is received the response of electronic control unit, on the interface of vehicle-borne diagnosis instrument, the implication of diagnostic trouble code (DTC) and representative thereof is shown on request, driver and crew can understand the situation of vehicle from the interface, in addition, vehicle-borne diagnosis instrument can compare the safe class of each fault, in the car load networking that the failure safe class information of fault level the highest (promptly the most serious fault) is sent, each controller can be carried out down by the control strategy of system definition after receiving these information.
In the CAN diagnostic message, frame data format is as follows:
Table three CAN frame data format
As:
740 Tx d 8 02 10 81 00 00 00 00 00
750 Rx d 8 02 50 81 80 00 00 00 00
740 and 750 is address informations of these two message, and what its was represented is that this message is which electronic control unit sends; And 8 are protocol-control-informations, and the length of representing these frame data is 8 bytes; " 10 81 0,000 00 00 00 " and " 50 81 80 00 00 00 00 " are the application layer data bytes, represent that these frame data want What for.
Vehicle-borne diagnosis instrument is distinguished the tracing trouble information of different electronic control units by address information, is stored in the different spaces.Following table is the address information of each electronic control unit:
Table quadrielectron control module identifier
Introduce the workflow of native system below in conjunction with accompanying drawing 2.
At first, vehicle-borne diagnosis instrument is arranged in driver and crew within sweep of the eye, is fit to driver and crew and observes in good time and use the diagnostic equipment function.
After opening ignition switch or vehicle-borne diagnosis instrument switch, vehicle-borne diagnosis instrument will send by state and read the diagnostic trouble code (DTC) service, issue each electronic control unit by gateway, after electronic control unit is received information, diagnostic trouble code (DTC) is sent to vehicle-borne diagnosis instrument by gateway, vehicle-borne diagnosis instrument can be according to different CAN identifier storage failure information, and point out driver and crew on display screen, and there is fault in this system.Whether driver and crew can select to read fault, and which fault understands present system has, influence to drive or safety.Vehicle-borne diagnosis instrument is checked all diagnostic trouble code (DTC) in its storage space then, and the highest information of failure code safe class is dealt on the network, after other electronic control units on the network receive this information, can make corresponding safety prevention measure.
The safety level information of fault is stored in the vehicle-borne diagnosis instrument storage space, after vehicle-borne diagnosis instrument reads diagnostic trouble code (DTC), be stored in the corresponding storage space, and the failure safe grade of this fault is compared, get the highest grade of failure safe information and send in the car load network.Next time, the diagnostic trouble code (DTC) that reads covered corresponding storage space when reading diagnostic trouble code (DTC).
Following table definition several failure safe class informations:
| The failure safe grade | Safety level information is described | Safety practice |
| 1 | Slight fault | Safety there is not influence |
| 2 | General fault | Little to security implication, need fix a breakdown |
| 3 | Serious fault | Safety had have a strong impact on, the speed of a motor vehicle should not surpass 30Km/H, need fix a breakdown immediately |
| 4 | Very serious fault | Safety is had a strong impact on, and the speed of a motor vehicle should not surpass 10Km/H, need fix a breakdown immediately |
Table five: failure safe class information
As shown in table five, all faults of Full Vehicle System are divided into four safe classes, be respectively: 1 grade of slight fault, 2 grades of general faults, 3 grades of serious faults and 4 grades of very serious faults.All faults all define a safe class, and for the fault of 1 grade or 2 grades, these securities to car load do not have too many influence, therefore, do not have compulsory safety practice to be added on the fault of this class; And for the fault of 3 grades and 4 grades since to the influence of security system more seriously or very serious, just need a prompting be arranged, and want the strict travel speed that limit this car the car owner, avoid having an accident assurance car owner's personal safety as well as the property safety.
The above only is preferred embodiment of the present invention, be not in order to limit claims of the present invention, and technological thought of the present invention can be used in other similar system widely, therefore every not breaking away from the equivalence change of being finished under the spirit disclosed in this invention or revising, all should be included in the scope of claims.
Claims (12)
1, a kind of vehicle diagnosis instrument system is characterized in that comprising:
Electronic control unit corresponding to the different operational module of automobile, has the diagnostic trouble code (DTC) of disparate modules; The vehicle-borne diagnosis instrument module, be used to read and store the diagnostic trouble code (DTC) of each electronic control unit, and vehicle failure and description thereof sent to display module, send the failure safe class information to network simultaneously, control device on the network is made safety prevention measure according to the failure safe class information;
Display module is used to show and point out the fault and the description of user's automobile.
2, vehicle diagnosis instrument system as claimed in claim 1 is characterized in that, described vehicle diagnosis instrument system comprises the On-Board Diagnostics (OBD) bus, is used for detection system, Data transmission between electronic control unit ECU.
3, vehicle diagnosis instrument system as claimed in claim 2 is characterized in that, described On-Board Diagnostics (OBD) bus comprises K radiodiagnosis x and/or CAN bus.
4, vehicle diagnosis instrument system as claimed in claim 1 is characterized in that, described vehicle diagnosis instrument system comprises the network communication module, and exchange message between vehicle electronics control module ECU forms the Vehicle Electronic Control network.
5, vehicle diagnosis instrument system as claimed in claim 1 is characterized in that, described vehicle diagnosis instrument system comprises automobile gateway, is used for the information between the variant sub-network is changed mutually, realizes the communication between heterogeneous networks.
6, vehicle diagnosis instrument system as claimed in claim 1 is characterized in that, the vehicle-borne diagnosis instrument module reads the diagnostic trouble code (DTC) that the current existence of each electronic control unit is read in the diagnostic trouble code (DTC) service by state.
7, vehicle diagnosis instrument system as claimed in claim 1 is characterized in that, vehicle-borne diagnosis instrument is distinguished the tracing trouble information of different ECU (Electrical Control Unit) by address information, is stored in the different spaces.
8, vehicle diagnosis instrument system as claimed in claim 1 is characterized in that, has the failure safe class information in the vehicle-borne diagnosis instrument storage space: 1 slight fault, 2 general faults, 3 serious very serious faults of fault, 4.
9, vehicle diagnosis instrument system as claimed in claim 8, it is characterized in that, 1 grade or 2 grades of faults, not having the safety practice of pressure applies, 3 grades, 4 grades faults, have such failure safe class information on network, engine management system and automatic gear-box control module meeting limiting engine rotating speed also limit the intention that the driver changes high-grade speed-raising, and the speed of a motor vehicle is limited in 30Km/H and 10Km/H respectively.
10, a kind of automobile failure diagnosis method is characterized in that having following steps:
(1) the vehicle-borne diagnosis instrument module sends and reads the diagnostic trouble code (DTC) service by state;
(2) above-mentioned service is issued each associated electrical control module by automobile gateway, after control module is received information, diagnostic trouble code (DTC) is sent to the vehicle-borne diagnosis instrument module by gateway;
(3) vehicle-borne diagnosis instrument is according to different address designator storage failure information, and points out driver and crew on display module;
(4) vehicle-borne diagnosis instrument is checked all diagnostic trouble code (DTC) in its storage space, and the failure code safety level information is dealt on the network.
11, automobile failure diagnosis method as claimed in claim 10, it is characterized in that in step (4), vehicle-borne diagnosis instrument is dealt into the highest information of failure code safe class on the network, after other controllers on the network receive this information, can make corresponding safety prevention measure.
Whether 12, automobile failure diagnosis method as claimed in claim 10 is characterized in that, driver and crew can select to read fault, thereby understand present system which fault is arranged, influence to drive or safety.
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| CN102114883A (en) * | 2010-09-21 | 2011-07-06 | 浙江吉利汽车研究院有限公司 | Self-test device for configurations of automotive electronic control unit and self-test method of the self-test device |
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