CN101174369A - Fault diagnosis didactics and experimental device of vehicle CAN bus system - Google Patents
Fault diagnosis didactics and experimental device of vehicle CAN bus system Download PDFInfo
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- CN101174369A CN101174369A CNA2007100597949A CN200710059794A CN101174369A CN 101174369 A CN101174369 A CN 101174369A CN A2007100597949 A CNA2007100597949 A CN A2007100597949A CN 200710059794 A CN200710059794 A CN 200710059794A CN 101174369 A CN101174369 A CN 101174369A
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Abstract
The invention relates to a teaching and training method and a practice testing device for the structure composition, the operating principle, the failure diagnosis and the system examination and maintenance of a vehicle CAN bus system. In particular, all failures of the vehicle CAN bus system can be arranged and removed freely, the failure reappearance are provided repeatedly to achieve the purposes of repeated operation, and wide new technology and new knowledge spread. The invention is characterized in that the invention discloses a failure diagnosis teaching method key point and an experimental device of a vehicle CAN bus system, the experimental device comprises all assembly (1) substances of the vehicle CAN bus system, the assembly (1) substances are arranged according to the position of the actual vehicle, and concentratedly fixed on a panel, and the panel is fixed on a box body (2). A bracket (3) is made under the box body, a horn wheel (4) with a self-locking device is arranged at the bottom of the bracket (3), the box body is movably connected with the bracket (3), the bracket can be horizontally arranged and also can be erectly arranged to be convenient for the teaching.
Description
One, technical field
Technical field---automotive operation and service engineering---transmission of knowledge that is communications and transportation under the utility model.Structure composition, principle of work, fault diagnosis, system that it relates to automobile mounted CAN bus system detect a kind of teaching, training method of safeguarding and practice experimental provision.Especially can arbitrarily be provided with and remove the various faults of vehicle CAN bus system, " recurrence of failure " is provided repeatedly, reach and to reuse the also purpose of wide-scale distribution new technology, new knowledge.
Two, background technology
Automotive electronic technology development is very swift and violent, and CAN bus and multiline message transmission technology are widely used in automobile manufacturing field, and along with the increase of its output, the price of CAN bus unit is also in continuous reduction, oriented in, the trend of low-grade automobile covering.As the POLO car that the Shanghai masses are produced, its price Renminbi is only surplus in the of 110,000 yuan, and the power system of this vehicle is to adopt the total line traffic control of CAN.The CAN bus is the advanced control technology that is widely used in fields such as auto industry manufacturing, the control of manufacturing industry streamline, industrial process control and robot, relevant knowledge relates to very wide also very dark, even some vocabulary of company, as: identifier, cyclic redundancy, data frame structure, bus arbitration, bus addressing etc. all are stranger for the automobile services industry.In auto repair service and automobile vocational education, not necessarily need to grasp all knowledge of CAN bus comprehensively.Understanding the structure of CAN bus forms, the principle of work of understanding the CAN bus system is just passable, in auto repair service industry and automobile vocational education, the emphasis GPRS be fault analysis, fault diagnosis, system maintenance and maintenance operation main points etc. at vehicle-mounted CAN bus and multistation information transmission system.
Current, the engineering technical personnel that comprehensively grasp automobile CAN-bus structural principle, the course of work and fault diagnosis maintenance technology in the automobile services industry lack in a large number, and work organizes grade of skill evaluation and technical examination also to be difficult to relate to these aspects with traffic department comprehensively.Because it is with high content of technology, system architecture is complicated, in the training of traffic specialty vocational education, also be difficult to relate to this field.On the other hand, the electric signal of directly gathering the CAN bus system on automobile is difficulty relatively also, will break some protective devices on the ring automobile toward contact, as when carrying out waveform testing, needs to use the threading apparatus lead that punctures; When using multimeter test Dynamic Signal, the marine glue that often need choose the bundle connector that bursts at the seams blocks up and just can collect signal, these all are easy to destroy water proofing property, dust tightness, leakproofness and the anti-interference of automobile reason, particularly the CAN bus system is very responsive to disturbing, have slightly not very in the operation, just the data transmission quality of CAN be might influence, and then the power performance and the rideability of car load influenced.
Three, summary of the invention
At the problems referred to above, the invention provides the fault diagnosis teaching method and the experimental provision of a cover vehicle CAN bus system,
(1) teaching method comprises structure composition, principle of work, the trouble hunting method and system maintaining method of vehicle-mounted CAN system, and its main points are as follows:
1. the structure of vehicle-mounted CAN system is formed: (1) has increased CAN receiver, transponder and processor in ECU (Electrical Control Unit), increased by two twisted-pair feeders between each controller of former electric-control system, has reduced by big wire harness.(2) divide power, comfortable and Infotainment 3 cover networks, 2 kinds of star structure and loop configuration are arranged.(3) the employing gateway controller is coordinated the data communication between the high slow network.
2.CAN the principle of work of bus: (1) connects polylith computer and mutual Data transmission.(2) can transmit multi-group data simultaneously, each ECU (Electrical Control Unit) 7-20ms sends a secondary data.(3) has priority order.
3.CAN the detection maintaining method of bus: (1) failure code diagnostic analysis: different with general automobiles electric-control system sensor, actuator failures sign indicating number, as: drive bus and lack information from ABS (ABS control module do not do coupling cause); Group's data bus miscommunication (gateway controller can not communication cause).(2) data-flow analysis: the same with general electric-control system data analysis, just network system failures also can cause related data to change.(3) wave form analysis: this is main means of judging CAN bus system link failure, is by oscillograph, with the formal check high-speed CAN of oscillogram and the working condition of low speed CAN.(4) controller coupling, self-adaptation adjustment: this is the thing that often will do in the auto repair service process.Do not adopting on the automobile of CAN control, computer (ECU (Electrical Control Unit)) is bad, we buy one new change just passable.And present many vehicles can not be worked after changing computer at once, also will encode to computer, controller or actuator are done operation ability operate as normal such as Adaptive matching.
(2) fault type of automobile CAN-bus and multistation information transmission system and maintenance measures: fault type has 3 classes.One class is a power fail, because power-supply system voltage is low, causes that controller can't operate as normal.The 2nd, node failure, the node of multistation information transmission system are each ECU (Electrical Control Unit) that network connects, so node failure is that ECU (Electrical Control Unit) itself has fault.The 3rd, link failure, not smooth because of the link of multistation information transmission system, cause the data can't normal communication.
1, power fail
The core of automobile multiplex system is the ECU (Electrical Control Unit) that contains communication IC chip, the normal working voltage of ECU (Electrical Control Unit) is generally in the scope of 10.5--15V, if the operating voltage that automobile power system provides is lower than this value, will make some ECU (Electrical Control Unit) that operating voltage is had relatively high expectations of short duration quitting work occur, so whole automobile multistation information transmission system is occurred can't communication failure.Maintenance measures generally is that replacing storage battery or elimination cause the low excessively root of supply voltage, guarantees that supply voltage is more than 10.5V.
2, node failure
Node is each ECU (Electrical Control Unit) that connects in the automobile multistation information transmission system, and it comprises two kinds of the software fault of ECU (Electrical Control Unit) and hardware faults.Software fault, i.e. host-host protocol or software program defectiveness or conflict, and then the communication of automobile multistation information transmission system is caused confusion maybe can't work, this fault generally occurs in batch, and can't keep in repair.Also having a class is the new node of changing (ECU (Electrical Control Unit)), does not activate or adapting software, causes the node software cisco unity malfunction of new replacing and node failure occurs.Hardware fault, generally be since in the ECU (Electrical Control Unit) communication chip or integrated circuit damage, ECU (Electrical Control Unit) can't be worked and cause the automobile multistation information transmission system can't operate as normal.The general independent appearance of this fault, adopt to change ECU (Electrical Control Unit) and again the mode of Adaptive matching repair.
3, link failure
Link is meant each internodal communication wire road.Link failure is that the data communication circuit breaks down, as short circuit, open circuit and communication signal decay or distortion that circuit causes because of physical property changes, these factors usually can cause a plurality of ECU (Electrical Control Unit) can't operate as normal or control system malfunction appears.Judge whether generally to adopt the diagnostic optical fiber instrument of oscillograph or automobile specified, observe the current data communication signal and whether conform to the normal data communication signal for link failure.Method for maintaining generally is the twisted-pair feeder circuit of repairing short circuit, opening circuit, or elimination changes the root of twisted-pair feeder physical property etc.
Experimental provision then is to constitute by whole component assemblies (1) of vehicle-mounted CAN system are in kind, comprises that all participate in formations such as controller, twisted-pair feeder, sensor and the actuator of CAN exchanges data, diagnose interface, instrument assembly, ignition switch.These whole automobile components that participate in the CAN exchanges data are put by the real vehicle position, concentrate and be fixed on the panel, the panel blueprint drawing, the installation testing terminal is used for direct Measurement Network communication electric signal on the circuit diagram, the connecting circuit of calibrating terminal back is connected to each controller according to the real vehicle terminal position, makes the CAN system can operate as normal and swap data.Panel is fixed on the casing (2).
Below casing, design and produce a support (3), the horn ring (4) of the bottom mounting strap self-locking device of support (3), casing (2) is movable with being connected of support (3), can horizontal, convenient teaching also can erect.A miniature motor (5) is installed below the casing, automobile ignition switch is connected with electric electromechanics, motor drives automobile current generator (6) also drives the crankshaft position sensor and the CMPS Camshaft Position Sensor of automobile simultaneously, so that determine correct ignition timing and injection timing.
After the said apparatus installation, start automobile ignition switch, vehicle CAN bus system just can be worked.The fault setting then is by fault switch, computing machine and telepilot to be set to realize the opening circuit of the high position of CAN system, low level, shorted to earth and short circuit etc. each other, also can use automobile fault diagnostic apparatus to revise each coding of controls.The method of fault diagnosis and maintenance is (one), (two) as described above.
Specific constructive form such as accompanying drawing:
Four, description of drawings
Accompanying drawing 1: the experiment device for teaching structural drawing that is vehicle CAN bus system.
1. be whole component assembly material objects of vehicle-mounted CAN system
2. be the casing of fixed panel
3. be the support of experimental provision
4. be the horn ring of band self-locking device
5. be a small-sized motor
6. be motor car engine
7. fault is provided with box
8. be that manual fault is provided with panel
9. be that fault is provided with telepilot
10. be fault setting and diagnosis computer
Accompanying drawing 2: be the network structure of vehicle CAN bus system and the synoptic diagram that open circuit fault takes place, wherein
1. be engine controller
2. be abs controller
3. be automatic transmission controller
4. be safety air sac controller
5. be instrument controller
6. be the webmaster controller
A. and arrow indication position show that network system opens circuit, this moment network system can't communication
Accompanying drawing 3: be the network structure of vehicle CAN bus system and the synoptic diagram that the signal attenuation fault takes place, wherein
A. and arrow indication position show that the fault of signal attenuation is taking place at this place, this moment, network system transmission quality limit was poor
Five, specific embodiments
Fault with cover of installation is provided with box (7) and with fault panel is set below support, fault is provided with on the panel installs fault switch (8) is set, fault is provided with switch and adopts circuit to be connected with the CAN system according to former fare road, by stirring the fault that fault is provided with on the panel switch (8) is set, just can realizes that vehicle CAN bus system opens circuit, shorted to earth and the dissimilar faults of short circuit mutually.The form of these faults and classification have multiple, can both cause controller and report an error and the storage failure code.The most common failure that the CAN system takes place in actual use for this and automobile is on all four.
The mode of fault setting also has other dual mode: 1. (10) the long-range setting that uses a computer, and (9) the long-range setting that 2. uses a teleswitch, to increase disguise that fault is provided with sudden, the enhancing teaching efficiency also provides check function.
By using automobile fault diagnostic apparatus connection diagnostic interface, the fault of " coding of controls mistake " can also be set, these fault types can cause also that controller reports an error and the storage failure code.Use automobile fault diagnostic apparatus again by correct encoding operation, just can eliminate fault.This with changer controller more after in time not do the failure mode that the controller coupling occurred be consistent.
Fault is provided with box (7) and is actually a control module, may command into and out of the connection of circuit, open circuit, the mutual short circuit between shorted to earth and each circuit, by fault switch (8), computing machine (10) or telepilot (9) being set controls, the CAN system failure that takes place on the various faults that just can simulated automotive CAN system, these faults and real vehicle is consistent.After fault takes place, can use automobile fault diagnostic apparatus to connect diagnostics interface and read also analysis of failure code, data stream.Also can use the waveform of the calibrating terminal testing CAN on the oscillograph connecting circuit figure, this moment needn't need be with thorn line device puncture netting twine as when test on real vehicle, directly measurement is just passable on calibrating terminal, and this mode can also be tempered the ability of everybody circuit analysis.Can also use multimeter to read various electric signal, be used for the fault analysis and judgement reason, find out place, real trouble spot from the calibrating terminal on the circuit diagram.
Claims (6)
1. the fault diagnosis teaching method and the experimental provision of vehicle CAN bus system, it is characterized in that: structure composition, principle of work, fault diagnosis, the system that relates to automobile mounted CAN bus system detects a kind of teaching, training method of safeguarding and practice experimental provision, especially experimental provision can arbitrarily be provided with and remove the various faults of vehicle CAN bus system, " recurrence of failure " is provided repeatedly, reaches and to reuse the also purpose of wide-scale distribution new technology, new knowledge.
2. method as claimed in claim 1 is characterized in that: at the training of auto repair service professional technique, auto repair and detection vocational education and examination, proposed relevant educational training main points.
3. a method as claimed in any preceding claim, it is characterized in that: adopt the making in kind of vehicle CAN bus system assembly, and put by the real vehicle position, concentrate and be fixed on the panel, the panel blueprint drawing, the installation testing terminal is used for direct Measurement Network communication electric signal on the circuit diagram, and the connecting circuit of calibrating terminal back is connected to each controller according to the real vehicle terminal position, makes the CAN system can operate as normal and swap data.Panel is fixed on the casing (2).
4. a method as claimed in any preceding claim, it is characterized in that: below casing, design and produce a support (3), the horn ring (4) of the bottom mounting strap self-locking device of support (3), casing (2) is movable with being connected of support (3), can horizontal, convenient teaching also can erect.A miniature motor (5) is installed below the casing, automobile ignition switch is connected with electric electromechanics, motor drives automobile current generator (6) also drives the crankshaft position sensor and the CMPS Camshaft Position Sensor of automobile simultaneously, so that determine correct ignition timing and injection timing.
5. a method as claimed in any preceding claim is characterized in that: the fault setting is by fault switch, computing machine and telepilot to be set to realize the opening circuit of the high position of CAN system, low level, shorted to earth and short circuit each other.
6. a method as claimed in any preceding claim, it is characterized in that: fault is provided with box (7) and is actually a control module, may command into and out of the connection of circuit, open circuit, the mutual short circuit between shorted to earth and each circuit, by fault switch (8), computing machine (10) or telepilot (9) are set and control, various faults that just can simulated automotive CAN system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100597949A CN101174369A (en) | 2007-09-27 | 2007-09-27 | Fault diagnosis didactics and experimental device of vehicle CAN bus system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100597949A CN101174369A (en) | 2007-09-27 | 2007-09-27 | Fault diagnosis didactics and experimental device of vehicle CAN bus system |
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| CN101174369A true CN101174369A (en) | 2008-05-07 |
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| CNA2007100597949A Pending CN101174369A (en) | 2007-09-27 | 2007-09-27 | Fault diagnosis didactics and experimental device of vehicle CAN bus system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074137B (en) * | 2009-11-20 | 2012-05-23 | 天津市优耐特汽车电控技术服务有限公司 | Automotive electric controlled supplemental restraint system (SRS) training equipment |
| CN102867454A (en) * | 2012-10-15 | 2013-01-09 | 湖南大学 | Teaching experiment platform of automobile body network control system |
| CN102116809B (en) * | 2009-12-30 | 2014-08-13 | 中国第一汽车集团公司 | Method for diagnosing phase sensor |
| CN105355121A (en) * | 2015-10-28 | 2016-02-24 | 苏州市远极智能科技有限公司 | Intelligent wire-breaking module and wire-breaking practical training detection system |
| CN106773901A (en) * | 2016-11-23 | 2017-05-31 | 河池学院 | A kind of auto repair method based on robot |
| CN108053710A (en) * | 2018-01-16 | 2018-05-18 | 重庆科技学院 | Automobile signal light teaching experimental base failure set system |
| CN110211477A (en) * | 2018-09-01 | 2019-09-06 | 天津博诺智创机器人技术有限公司 | A kind of industrial robot adjustment maintenance training system |
| CN112634696A (en) * | 2020-12-21 | 2021-04-09 | 贝壳技术有限公司 | Fault positioning practice method and device, electronic equipment and storage medium |
-
2007
- 2007-09-27 CN CNA2007100597949A patent/CN101174369A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074137B (en) * | 2009-11-20 | 2012-05-23 | 天津市优耐特汽车电控技术服务有限公司 | Automotive electric controlled supplemental restraint system (SRS) training equipment |
| CN102116809B (en) * | 2009-12-30 | 2014-08-13 | 中国第一汽车集团公司 | Method for diagnosing phase sensor |
| CN102867454A (en) * | 2012-10-15 | 2013-01-09 | 湖南大学 | Teaching experiment platform of automobile body network control system |
| CN102867454B (en) * | 2012-10-15 | 2014-11-12 | 湖南大学 | Teaching experiment platform of automobile body network control system |
| CN105355121A (en) * | 2015-10-28 | 2016-02-24 | 苏州市远极智能科技有限公司 | Intelligent wire-breaking module and wire-breaking practical training detection system |
| CN106773901A (en) * | 2016-11-23 | 2017-05-31 | 河池学院 | A kind of auto repair method based on robot |
| CN108053710A (en) * | 2018-01-16 | 2018-05-18 | 重庆科技学院 | Automobile signal light teaching experimental base failure set system |
| CN110211477A (en) * | 2018-09-01 | 2019-09-06 | 天津博诺智创机器人技术有限公司 | A kind of industrial robot adjustment maintenance training system |
| CN112634696A (en) * | 2020-12-21 | 2021-04-09 | 贝壳技术有限公司 | Fault positioning practice method and device, electronic equipment and storage medium |
| CN112634696B (en) * | 2020-12-21 | 2023-01-31 | 贝壳技术有限公司 | Fault positioning exercise method and device, electronic equipment and storage medium |
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Open date: 20080507 |