CN104267715A - Vehicle-mounted electronic control unit LIN bus communication automatic testing device and system - Google Patents
Vehicle-mounted electronic control unit LIN bus communication automatic testing device and system Download PDFInfo
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- CN104267715A CN104267715A CN201410468022.0A CN201410468022A CN104267715A CN 104267715 A CN104267715 A CN 104267715A CN 201410468022 A CN201410468022 A CN 201410468022A CN 104267715 A CN104267715 A CN 104267715A
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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
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0256—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults injecting test signals and analyzing monitored process response, e.g. injecting the test signal while interrupting the normal operation of the monitored system; superimposing the test signal onto a control signal during normal operation of the monitored system
Abstract
The invention relates to a vehicle-mounted electronic control unit LIN bus communication automatic testing device. A test host of the device controls a programmable power supply to output voltages of different amplitudes according to the work needs of an ECU. The physical layer testing signal of a LIN bus is output to a network oscilloscope to be displayed, and physical layer testing data are transmitted to the test host through the network oscilloscope. ECU testing data are transmitted to the test host through bus data collecting equipment. The test host records, analyzes and evaluates the testing data of the ECU and the LIN bus to generate a test report. The test host controls all relays of a bus test board card to be connected or disconnected through a bus control board card to execute bus fault injection operation. According to the vehicle-mounted electronic control unit LIN bus communication automatic testing device, various defects of manual testing are overcome, unnecessary repeated labor of a vehicle-mounted network engineer is reduced, and the test result is precise.
Description
Technical field
The present invention relates to vehicle control device testing software, particularly a kind of for efficiently complete LIN network service test and network management test vehicle-mounted electronic control unit LIN bus communication automatic test device and system.
Background technology
On present-day motor vehicles, usually install multiple electronic control unit (ECU), each control module realizes collaborative work to each other by access LIN network (Controller Area Network, LIN).In the ECU development phase, car load factory can discharge ECU communication requirement specification to ECU supplier, and ECU network management requirement specification and gateway route need specification retrain ECU.After ECU has developed, car load factory can carry out strict network test to guarantee that ECU can normally work in LIN network to ECU.The network test of current car load factory is based on manual test, and test is auxiliary automatically, and efficiency is low, low precision, and the test duration is long.Test job comprises test environment and builds, test execution, and test data is preserved, and test result evaluation and test report such as to write at the step.The duration of single ECU network test is generally two to three days, and along with the increase of the ECU number on motor vehicles and the concurrent development of many moneys vehicle, the work of Test Engineer is also in increase at double.Because the network test method of different ECU is substantially identical, result in Test Engineer and be mostly carrying out the duplication of labour.What can not ignore is a bit that manual test will inevitably introduce personal error simultaneously, causes impact to the accuracy of test result.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of vehicle-mounted electronic control unit LIN bus communication automatic test device and system, and this Apparatus and system can be tested the controller local area network at electronic control unit on motor vehicles and place thereof accurately and efficiently.
In order to solve the problems of the technologies described above, vehicle-mounted electronic control unit LIN bus communication automatic test device of the present invention comprises programmable power supply, network oscilloscope, bus data acquisition equipment (CANcaseXL), Test Host, testing and control board, bus test board; Test Host is by GPIB connection control programmable power supply; By Ethernet interface connection control network oscilloscope; By USB interface connection control bus interferometer and bus data acquisition equipment; Network oscilloscope, bus data acquisition equipment (CANcaseXL), ECU to be measured are connected in LIN bus; Test Host is by USB interface connecting test Control card, and the IO output port of testing and control board connects bus test board; Programmable power supply is connected with LIN bus and ECU by power lead BAT, ground wire GND; Relay matrix comprises the first relay, the second relay that are connected on power lead BAT between programmable power supply and ECU, ground wire GND, is connected to the 3rd relay between power lead BAT and LIN line, is connected to the 4th relay of ground wire GND and LIN line.
Test Host exports control signal to programmable power supply, makes it export the voltage of different amplitude according to the work requirements of ECU; The Physical layer test signal of LIN bus outputs to network oscilloscope and shows, and Physical layer test data sends Test Host to by network oscilloscope; ECU test data passes through bus data acquisition device transmission to Test Host; The test data of Test Host to ECU and LIN bus records, analyzes, evaluates and generate test report.When needs perform bus failure implant operation, Test Host outputs signal to bus test board by bus marco board, controls each relay closes or disconnection; When the first relay, the second relay closes, normal electric duty can be simulated.3rd relay can realize LIN line to power supply short circuit; 4th relay can realize LIN line shorted to earth.
The present invention also comprises stabilized voltage supply, and described stabilized voltage supply is connected with bus test board, for bus test board is powered.
Vehicle-mounted electronic control unit LIN bus communication automatization test system comprises following module:
LDF communications database: for storing the message information that ECU corresponding to each vehicle needs to send and receive;
Information database: comprise model data storehouse, test specification database, test case data storehouse, test result data storehouse, test case library, for storing vehicle information, test specification information, various vehicle corresponding test case information, test result information, test case;
Test correlation parameter load module: for the correlation parameter of typing ECU to be measured;
Test cases selection module: search vehicle information corresponding in information database according to the correlation parameter of the ECU to be measured of typing, and the test case information that this vehicle information is corresponding, from test case library, select corresponding test case according to test case information, and inquire about the message information that LDF communications database obtains the transmission of this ECU needs and reception;
Programmable power supply interface module: for exporting control signal to programmable power supply, makes it export the voltage of different amplitude according to the work requirements of ECU;
Network oscilloscope interface module: for receiving the Physical layer test data of LIN bus;
Bus data acquisition device interface module: for gathering ECU test data;
Test control panel card interface module: for the control signal of each relay on-off in output bus test board;
Testing tool initialization connecting test module in hardware system: test for being connected with the initialization of testing and control board programmable power supply, network oscilloscope, bus data acquisition equipment, bus interferometer;
Network failure injection module: for generation of bus test board relay matrix control signal, realizes LIN line to power supply short circuit, LIN line shorted to earth;
Collector: for carrying out integrity detection to the test case selected;
Test module: test for the test case selected;
Testing and control, record and report generation module: test process is controlled, and generate test record file and test report.
Described information database is also for storing evaluation criteria information; Testing and control, record and report generation module generate test result appraisal report according to evaluation criteria information and real measured data.
Described test module comprises following submodule:
Message test submodule: for the test of heading break length of field, the test of heading Del length of field, heading synchronization field length testing;
Bus physical layer test submodule: for the test of bus signal level, bit time;
Sleep awakening test submodule: bus free sleep test, the test of bus sleep commands, the test of bus wake command, this locality wake test up;
ECU supply voltage test submodule: for testing the test of under-voltage working range, superpotential working range;
LIN host node dispatch list test submodule: dispatch list sequential testing, the test of dispatch list time slot.
Described ECU under-voltage test cell comprises following subelement:
Under being greater than 0V condition at supply voltage, controlling programmable power supply reduction ECU supply voltage and make it be in the subelement of under-voltage state;
For judging whether ECU message occurs the subelement of erroneous frame for the first time;
For recording the subelement of now voltage value when erroneous frame appears in ECU first time;
It is made to stop the subelement of communication for control ECU;
For record ECU stop communication time voltage value subelement;
When during for judging that erroneous frame appears in ECU first time, voltage value and ECU stop communication, whether voltage value meets the subelement of specification.
For exporting the subelement of test passes mark.
Beneficial effect of the present invention:
1, the present invention is by building the hardware effort platform comprising programmable power supply, high-precision network oscilloscope, bus data acquisition equipment CANcaseXL, bus test board and testing and control board (NI board), Test Host, and carry out unified management, co-ordination by Test Host, overcome manual test various shortcoming, avoid test at every turn all will carry out complicated test environment building before starting, decrease the duplication of labour that In-vehicle networking slip-stick artist is unnecessary, avoid manual operation simultaneously and can introduce artificial error, affect the accuracy of test result.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the Organization Chart of vehicle-mounted electronic control unit LIN bus communication automatic test device of the present invention and system.
Fig. 2 is the structured flowchart of vehicle-mounted electronic control unit LIN bus communication automatic test device of the present invention.
Fig. 3 is the structural representation of bus test board of the present invention.
Fig. 4 is the structured flowchart of vehicle-mounted electronic control unit LIN bus communication automated system.
Fig. 5 is the main program flow chart of vehicle-mounted electronic control unit LIN bus communication automated system.
Fig. 6 is test module structured flowchart.
Fig. 7 is ECU under-voltage test subsystems structured flowchart.
Fig. 8 is ECU under-voltage test subroutine process flow diagram.
Embodiment
As shown in Figure 1, 2, hardware rack of the present invention the testing apparatuss such as programmable power supply, stabilized voltage supply, network oscilloscope, bus data acquisition equipment CANcaseXL, bus test board and testing and control board (NI board), Test Host is integrated in a rack to carry out unified management.Installation testing management software in Test Host, supervision test software is by GPIB (general purpose interface bus) Interface Controller programmable power supply; By the high-precision network oscilloscope of Ethernet (Ethernet) Interface Controller; Control testing and control board by USB interface, testing and control board provides a series of IO output port, and these IO output ports can the relay matrix of control bus test board.Programmable power supply is used for the power supply of tested ECU, and supply voltage can change between 0V-50V, because part test case in test process needs the break-make adjusting magnitude of voltage rise/fall or control power supply so must adopt the real-time control voltage change of programmable power supply.Programmable power supply must support gpib interface.Stabilized voltage supply is used for providing 12V voltage for bus test board.High-precision network oscilloscope is used for realizing bus physical layer test, as bus signal level test, bit time test etc.Network oscilloscope can suitably select the oscillograph that sample frequency, bandwidth are higher, and provides Ethernet interface for programmed control.CANcaseXL is used for data acquisition bus data and is transferred to Test Host, by Test Host record and analysis bus data; Direct fault location function can provide LIN line to direct fault location operations such as power supply short circuit, LIN line shorted to earths.
As shown in Figure 3, described bus test board repeat circuit matrix comprises the first relay J 1, second relay J 2 be connected on power lead BAT between programmable power supply and ECU, ground wire GND, be connected to the 3rd relay J 3 between power lead and LIN line, be connected to the 4th relay J 4 between ground wire GND and LIN line.
Software section of the present invention comprises: test supervisor program, test case library and pc control procedure.Test supervisor program, comprises data base administration, test execution management and user management.Data base administration is used for the storage for different automobile types related data, comprises and stores vehicle information, test specification information, test-types information, test case information etc.; Test execution management is for matching different vehicles; User management is used for newly-built user, and different user rights is different.Test case library comprises: the test of under-voltage working range, the test of superpotential working range, ECU not destroyed voltage range test, the test of bus output level, tolerance test, ECU inner walkway, the test of heading break length of field, the test of heading DEL length testing, heading synchronization field length testing, baud rate, sleep awakening test, dispatch list sequential testing, the test of dispatch list time slot etc., can delete test case according to different vehicles.Pc control procedure for testing the typing of correlation parameter, selection and implementation of test cases, and controlling test process, preserving test record and generating record test report.
As shown in Figure 4, vehicle-mounted electronic control unit LIN bus communication automated system of the present invention comprises: LDF communications database; Information database; Test case library; Test correlation parameter load module; Test cases selection module; Programmable power supply interface module; Network oscilloscope interface module; Data acquisition bus data equipment interface module; Test control panel card interface module; Testing tool initialization connecting test module in hardware system; Network failure injection module; Collector; Testing and control, record and report generation module.
LDF communications database: for storing the message information that different ECU needs to send and receive.
Information database: comprise model data storehouse, test specification database, test-types information database, evaluation criteria database, test case data storehouse, test result data storehouse, test case library; Model data storehouse is for storing vehicle information; Test specification database is for storing ECU test specification information corresponding to various vehicle (comprise the network segment belonging to ECU, ECU develops version and ECU title etc.), test-types information; Evaluation criteria database is for storing evaluation criteria information, failure code information, routing iinformation; Test case data storehouse is for storing the test case information of testing needed for various vehicle, such as a certain vehicle, test case information comprises Physical layer test (comprising bus signal level test, the test of rising edge negative edge slope, bit time test etc.), data link layer test (comprising LIN bus protocol test etc.); For another kind of vehicle, test case information comprises Physical layer test, network layer test; Test result data storehouse is used for store test results information.Test case library can meet multiple test cases of various vehicle test needs for storing.
Test correlation parameter load module: for the correlation parameter of typing ECU to be measured; Comprise the network segment belonging to ECU, ECU software and hardware version and ECU title etc.
Test cases selection module: search vehicle information corresponding in information database according to the correlation parameter of the ECU to be measured of typing, and the test case information that this vehicle information is corresponding, from test case library, select corresponding test case according to test case information, and inquire about the message information that LDF communications database obtains the transmission of this ECU needs and reception;
Programmable power supply interface module: for exporting control signal to programmable power supply, makes it export the voltage of different amplitude according to the work requirements of ECU;
Network oscilloscope interface module: for receiving the Physical layer test data of LIN bus;
Bus data acquisition device interface module: for gathering ECU test data;
Test control panel card interface module: for the control signal of each relay on-off in output bus test board;
Testing tool initialization connecting test module in hardware system: test for being connected with the initialization of testing and control board programmable power supply, network oscilloscope, bus data acquisition equipment;
Network failure injection module: for generation of bus test board relay matrix control signal, realizes LIN line to power supply short circuit, LIN line shorted to earth direct fault location;
Collector: for carrying out integrity detection to the test case selected, such as ECU to be measured, a certain vehicle in corresponding model data storehouse, its test case information comprises the test of superpotential working range, the not destroyed voltage range test of ECU, bus output level is tested, ECU inner walkway, heading break length of field is tested, heading DEL length testing, heading synchronization field length testing, baud rate is tested, sleep awakening is tested, dispatch list sequential testing, dispatch list time slot is tested, and the test case selected has lacked these two, then need from test case library, select under-voltage working range to test, tolerance is tested these two and is added in test case queue.
Test module: test for the test case selected;
Testing and control, record and report generation module: test process is controlled, and generate test record file, test result appraisal report according to test case evaluation criteria information and real measured data.
As shown in Figure 5, Test Host main program flow is as follows:
(1) detecting information typing, comprises the network segment belonging to ECU, ECU software and hardware version and ECU title etc.;
(2) test cases selection, as ECU under-voltage, superpotential test etc.;
(3) test is started;
(4) integrity detection is carried out to the test case that compiling is selected, if by detecting, entering step (5), otherwise returning step (3), the test case missed being added in test case queue;
(5) start to perform test for the test case selected;
(6) whether interpretation generates test report, is, enters step (7), otherwise goes to step (8);
(7) test report is generated;
(8) terminate.
To correspond to the ECU to be measured of a certain vehicle, as shown in Figure 6, described test module comprises following submodule:
Message test submodule: for the test of heading break length of field, the test of heading Del length of field, heading synchronization field length testing;
Bus physical layer test submodule: for the test of bus signal level, bit time;
Sleep awakening test submodule: bus free sleep test, the test of bus sleep commands, the test of bus wake command, this locality wake test up;
ECU supply voltage test submodule: for testing the test of under-voltage working range, superpotential working range;
LIN host node dispatch list test submodule: dispatch list sequential testing, the test of dispatch list time slot.
Heading break length of field test in described message test submodule, the test of heading Del length of field, heading synchronization field length testing can realize by same subroutine, also can realize by a subroutine respectively.
The test of bus signal level, bus signal level rise/fall edge, bit time adopts a subroutine to realize.
Dispatch list sequential testing, dispatch list time slot test can a subroutine also can two subroutines.
Test process is described in detail below for ECU under-voltage test cell.The test process of all the other test cases belongs to more conventional technology, is not repeated here.
As shown in Figure 7, described ECU under-voltage test cell comprises following subelement:
Under being greater than 0V condition at supply voltage, controlling programmable power supply and make ECU supply voltage reduce the subelement of 0.1V;
For judging whether ECU message occurs the subelement of erroneous frame for the first time;
For recording the subelement of now voltage value when erroneous frame appears in ECU first time;
For judging whether ECU stops the subelement of communication;
The subelement of voltage value after communication is stopped for recording ECU;
After during for judging that erroneous frame appears in ECU first time, voltage value and ECU stop communication, whether voltage value meets the subelement of specification;
For exporting the subelement of test passes mark.
As shown in Figure 8, ECU under-voltage test subroutine flow process is as follows:
A () starts;
B () ECU powers on;
C () judges whether supply voltage is greater than 0V, is, control programmable power supply ECU supply voltage and reduce 0.1V;
D () judges that whether erroneous frame appears to ECU message in first time, is go to step (e), otherwise records now voltage value;
E () judges whether ECU stops communication, is go to step (f), otherwise returns step (c);
F () record ECU stops the voltage value after communication;
After when () judges that erroneous frame appears in ECU first time g, voltage value and ECU stop communication, whether voltage value meets specification, is go to step (h), otherwise exports test failure mark, goes to step (i);
H () exports test passes mark;
I () terminates.
It is as follows that hardware rack of the present invention builds flow process:
The first step, for network automatically test cabinet installs power control switch.Network automatically test cabinet is that 220V powers.Power control switch is placed in rack top, has overcurrent protection function.Automatically the power supply of whole rack can be cut off when current value exceedes maximum current.It, primarily of air switch and emergency stop switch composition, can cut off the power supply of whole rack when wherein emergency stop switch is pressed.
Second step, installs the required power supply of network automatically test.Rack comprises two independently power supplys, is made up of respectively a stabilized voltage supply and a programmable power supply.Stabilized voltage supply output voltage 12V voltage, for bus test board is powered.Programmable power supply exports 0V-50V voltage, for tested ECU powers.Programmable power supply needs to turn USB module by GPIB and is connected with Test Host, and Test Host is installed after GPIB drives and can be realized controlling.
3rd step, installs high-precision network oscilloscope.Need the size customization rack subrack according to network oscilloscope before installing network oscilloscope, network oscilloscope is first fixed in test subrack, then test subrack is positioned over rack assigned address, is connected with Test Host by Ethernet netting twine.
4th step, is fixed in the subrack of customization by testing requirement by bus test board, and bus test board is powered by stabilized voltage supply, supply voltage 12V.Bus test board is exported by IO numeral and controls, and is connected with IO digital output port by connector.IO numeral exports control and bus marco board (NI board) can be adopted to control.Fig. 3 is the structured flowchart of bus test board.
5th step, the setting of Test Host.First, need in Test Host the device drives such as programmable power supply, network oscilloscope, bus marco board are installed; Secondly, need to write a pc control procedure [F1] i.e. supervision test software, this software is unified controls each hardware testing equipment.The CAPL Browser environment of test case in Vector company CANoe software of core carries out program development, and CANoe provides all kinds of routine interface, as gpib interface, Ethernet interface, serial communication interface etc.Supervision test software possesses database management function can, by the typing of test relevant information, make network test rack become the test macro of hardware and software platform, robotization.
Fig. 5 is the software systems method flow diagram of vehicle-mounted electronic control unit LIN bus communication automated system.The method of network test and management comprises the steps:
Step S1, after software startup, Automatic inquirying vehicle information database [F6], obtain the vehicle information of preserving in vehicle information database, test-types information (if the test of LIN host node, LIN are from node test), test specification information and test case information etc., and show relevant information in software.
Step S2, detecting information configures.Detecting information comprises the network segment belonging to ECU, and ECU develops version and ECU title etc.Test case library [F2] determines the test file that need run according to these information, and inquires about the message information that LIN communications database [F3] obtains the transmission of this ECU needs and reception.
Step S3, chooses the test case needing to carry out testing.Concrete methods of realizing is as follows:
All test case information is kept in the test case data storehouse of vehicle information database [F6], is presented on interface according to the test case title that the vehicle information selected and test-types information can perform, for you to choose.
Step S4, starts test.Click " starting test " button, start once newly to test.Automatic testing software completes and connects the initialization of dependence test instrument, and when test case information write configuration file (ini form) is run for test case library.Concrete methods of realizing is as follows: automatic testing software completes the connection to testing tool in hardware system [F7]: with the connection (native system adopts gpib interface communication) of programmable power supply, with the connection (native system adopts Ethernet interface communication) of network oscilloscope, with the connection (native system employing serial communication) of external interface circuit.If with the initialization connection failure of arbitrary testing tool, then point out slip-stick artist, and stop this test.Automatic testing software is by test cases selection information, evaluation criteria information write configuration file, determine the test case needing to perform in order to test case library [F2] according to profile information, and according to evaluation criteria information, the result that test obtains is evaluated.
After step S5, step S4 are complete, enter step S5, perform the test item chosen successively.Concrete methods of realizing is as follows: the test item use-case chosen performs by test case library [F2] successively.In each test item, send by the opening and closing of relay and to the order of programmable power supply and network oscilloscope, build the test environment needed for test case.If need direct fault location, then call network failure injecting program [F4].If the test procedure relevant to network oscilloscope, then call network signal test procedure [F5].Then perform the test statement in this test case one by one, obtain final test result, and result and evaluation criteria information are contrasted, determine whether test item passes through.Each test case all generate independently test record file to preserve test data.
Step S6, after test terminates, generates test report.Click " generating report " button, then automatic testing software calls report generation module.
Step S7, automatic testing software is type belonging to this test, calls corresponding template, by test result data write report.
Claims (6)
1. a vehicle-mounted electronic control unit LIN bus communication automatic test device, is characterized in that comprising programmable power supply, network oscilloscope, bus data acquisition equipment, Test Host, testing and control board, bus test board; Test Host is by GPIB connection control programmable power supply; By Ethernet interface connection control network oscilloscope; Network oscilloscope, bus data acquisition equipment, ECU to be measured are connected in LIN bus; Test Host is by USB interface connecting test Control card, and the IO output port of testing and control board connects bus test board; Programmable power supply is connected with LIN bus and ECU by power lead BAT, ground wire GND; Integrated relay matrix in described bus test board; Relay matrix comprises the first relay, the second relay that are connected on power lead between programmable power supply and ECU, ground wire GND.
2. vehicle-mounted electronic control unit LIN bus communication automatic test device according to claim 1, characterized by further comprising stabilized voltage supply, described stabilized voltage supply is connected with bus test board.
3. a vehicle-mounted electronic control unit LIN bus communication automatization test system, is characterized in that comprising following module:
LDF communications database: for storing the message information that ECU corresponding to each vehicle needs to send and receive;
Information database: comprise model data storehouse, test specification database, test case data storehouse, test result data storehouse, test case library, for storing vehicle information, test specification information, various vehicle corresponding test case information, test result information, test case;
Test correlation parameter load module: for the correlation parameter of typing ECU to be measured;
Test cases selection module: search vehicle information corresponding in information database according to the correlation parameter of the ECU to be measured of typing, and the test case information that this vehicle information is corresponding, from test case library, select corresponding test case according to test case information, and inquire about the message information that LDF communications database obtains the transmission of this ECU needs and reception;
Programmable power supply interface module: for exporting control signal to programmable power supply, makes it export the voltage of different amplitude according to the work requirements of ECU;
Network oscilloscope interface module: for receiving the Physical layer test data of LIN bus;
Bus data acquisition device interface module: for gathering ECU test data;
Test control panel card interface module: for the control signal of each relay on-off in output bus test board;
Testing tool initialization connecting test module in hardware system: test for being connected with the initialization of testing and control board programmable power supply, network oscilloscope, bus data acquisition equipment;
Network failure injection module: for generation of bus test board relay matrix control signal, realizes LIN line to power supply short circuit, LIN line shorted to earth direct fault location;
Collector: for carrying out integrity detection to the test case selected;
Test module: test for the test case selected;
Testing and control, record and report generation module: test process is controlled, and generate test record file and test report.
4. vehicle-mounted electronic control unit LIN bus communication automatic test device according to claim 3, is characterized in that described information database also for storing evaluation criteria information; Testing and control, record and report generation module generate test result appraisal report according to evaluation criteria information and real measured data.
5. vehicle-mounted electronic control unit LIN bus communication automatic test device according to claim 3, is characterized in that described test module comprises following submodule:
Message test submodule: for the test of heading break length of field, the test of heading Del length of field, heading synchronization field length testing;
Bus physical layer test submodule: for the test of bus signal level, bit time;
Sleep awakening test submodule: bus free sleep test, the test of bus sleep commands, the test of bus wake command, this locality wake test up;
ECU supply voltage fault test submodule: for testing the test of under-voltage working range, superpotential working range;
LIN host node dispatch list test submodule: dispatch list sequential testing, the test of dispatch list time slot.
6. vehicle-mounted electronic control unit LIN bus communication automatic test device according to claim 5, is characterized in that described ECU under-voltage test cell comprises following subelement:
Under being greater than 0V condition at supply voltage, controlling programmable power supply reduction ECU supply voltage and make it be in the subelement of under-voltage state;
For judging whether ECU message occurs the subelement of erroneous frame for the first time;
For recording the subelement of now voltage value when erroneous frame appears in ECU first time;
It is made to stop the subelement of communication for control ECU;
For record ECU stop communication time voltage value subelement;
When during for judging that erroneous frame appears in ECU first time, voltage value and ECU stop communication, whether voltage value meets the subelement of specification;
For exporting the subelement of test passes mark.
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