CN102589603B - Comprehensive test system for automobile instruments - Google Patents
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Abstract
The invention relates to a comprehensive test system for automobile instruments. According to the comprehensive test system for the automobile instruments, a CPU (Central Processing Unit) master control module is used for carrying out global control on other eight modules, the outputs of the modules are controlled at all time according to control instructions from a man-machine interface display module, and various parameters of the system can be inputted, modified and stored. The comprehensive test system can randomly meet the requirements on the repeated endurance test and basic error test on various automobile instruments, such as odometers, tachometers, water temperature gauges, fuel gauges, oil pressure gauges, barometers, voltmeters, and various indication lamps and lighting lamps of instrument panels, and the operation is simple. During the process of system designing, the ergonomic factors are fully considered, and the error-proofing design is fused during the process of parameter input, so that the parameter input is rejected and the operation of alarming is carried out if the data input is incorrect.
Description
Technical field
the present invention relates to a kind of Novel automobile instrument comprehensive test system.
Background technology
At present, automobile instrument is of a great variety, and automobile instrument structural change is rapid.As automobile instrument kind is divided into by structure: physical construction automobile instrument, criss-cross construction electronic watch, stepping motor structure electronic instrument, All Digital Electronic instrument.All kinds of instrument are durable, and test is all that tailor-made special-purpose testing equipment meets automobile instrument test demand with fundamental error, if do not test special-purpose testing equipment, need to adopt stabilized voltage supply collocation signal generator, resistance box, BCM module etc. to complete.To product testing, bring very big inconvenience: 1. before test, hardware connection work is loaded down with trivial details, process of the test is uncontrollable, test number (TN) record is not full and accurate.2. in process of the test, signal accuracy is not high, and process capability simulation is not strong, tests final effect unsatisfactory.3. different instrument need to carry out system adjustment to hardware circuit, and equipment and process of the test versatility are not strong.
Summary of the invention
Object of the present invention is exactly the above-mentioned deficiency for prior art, a kind of testing requirements that can meet all kind automobile instruments is provided, simple operations, and can complete fast the automobile instrument knot that the durable verification of all kinds of instrument, fundamental error detect and combine pilot system.
Object of the present invention can be achieved through the following technical solutions:
A Novel automobile instrument comprehensive test system, is characterized in that it includes following functional module:
CPU main control module, the command centre sending for data processing and the instruction of testing equipment;
Man-machine interface information display module, for inputting test dictation and various test parameters, dynamic monitoring parameter display, process of the test simulation, guiding testing crew carries out associative operation prompting;
Pwm signal generation module, is connected with automobile instrument assembly, and it is synthetic that the data that send according to CPU main control module are carried out frequency signal, and the line output of going forward side by side is controlled;
CAN signaling module, is connected with automobile instrument assembly, and it is synthetic that the data that send according to CPU main control module are carried out CAN information, and the line output of going forward side by side is controlled;
Frequency square-wave signal generation module, is connected with automobile instrument assembly, and it is synthetic that the data that send according to CPU main control module are carried out frequency signal, and the line output of going forward side by side is controlled;
Network resistor output module, is connected with automobile instrument assembly, and it is synthetic that the data that send according to CPU main control module are carried out resistance signal, and the line output of going forward side by side is controlled;
Programmable voltage output module, is connected with automobile instrument assembly, and it is synthetic that the data that send according to CPU main control module are carried out programmable voltage signal, and the line output of going forward side by side is controlled;
Meter lamp detection module, is connected with automobile instrument assembly, and the meter lamp idsplay order sending according to CPU main control module, exports control.
Contact expansion output module, is connected with automobile instrument assembly, sends information carry out contact output control, simulated automotive battery switch, ignition switch, light switch function according to CPU main control module.
The control core of described CPU main control module is: the PLC of 64, PLC carries out data communication with man-machine interface touch screen constantly, utilize the least-significant byte output port of the Y0-Y7 of PLC to carry out sheet to each signal generating module and translate code selectively, utilize the Y10-Y17 of PLC and 16 bit synchronizations of Y20-Y27 and frequency square-wave signal generation module, resistor network module, pwm signal generation module, programmable voltage output module, meter lamp detection module, contact expansion output module, CAN signaling module to carry out exchanges data and control in the mode of transmitting that walks abreast;
Described pwm signal generation module hardware is configured to: 8 central processing units, photoelectric isolating circuit, signal amplification circuit, frequency amplitude Circuit tuning, frequency size data, the dutycycle size transmitting according to CPU main control module carried out software and processed synthetic rear satisfactory signal, carry out again photoelectricity isolation, then drive processing, the signal of handling well sends the terminal of instrument to;
Described man-machine interface information display module adopts very color touch-screen, and programme by configuration software, man-machine interface information display module, for inputting test dictation and various test parameters, dynamic monitoring parameter display, process of the test simulation, guiding testing crew carries out associative operation prompting;
Described frequency signal is controlled submodule, by parallel I/O conversion receiver, frequency-fixed signal generator, binary-coded decimal rate multiplier, 1/10 frequency divider, photoelectric isolating circuit, signal amplification circuit, frequency amplitude Circuit tuning forms, parallel I/O conversion receiver receives the data that CPU main control module transmits, and by the data allocations of accepting to binary-coded decimal rate multiplier, binary-coded decimal rate multiplier synthesizes satisfactory frequency signal in conjunction with 1/10 frequency divider and frequency-fixed signal generator, synthetic frequency signal is undertaken after anti-interference process by photoelectric isolating circuit, by signal amplification circuit and frequency amplitude Circuit tuning, final output frequency square-wave signal is exported to instrument terminal,
Described network resistor is controlled submodule, by parallel I/O conversion receiver, 20 kinds of standard precision resistances, 20 relay, relay drive circuits that switch precision resistance, formed, parallel I/O conversion receiver receives the data that CPU module transmits, and by the data allocations of accepting to relay drive circuit, driving circuit drives relay to move, 20 kinds of precision resistances are connected to switch and synthesize, the complete instrument test parameters of the resistance signal requirement of final output;
Described programmable voltage is controlled submodule, by parallel I/O conversion receiver, pressure regulation sample circuit, voltage stabilizing circuit, current rectifying and wave filtering circuit, formed, first this module is converted into galvanic current source by current rectifying and wave filtering circuit by alternating current, then according to parallel I/O conversion receiver, receive the data that CPU module transmits, and by the data allocations of accepting to pressure regulation sample circuit, in conjunction with voltage stabilizing circuit, can synthesize programmable voltage signal arbitrarily again, for meeting the testing requirements of voltage table on automobile instrument;
Described meter lamp is controlled submodule, by parallel I/O conversion receiver, relay drive circuit, relay contact conversion electric power polar circuit, formed, parallel I/O conversion receiver receives the data that CPU module transmits, and by the data allocations of accepting to relay drive circuit, driving circuit goes to drive again controls often opening or normally closed contact of conversion electric power polarity relay, switches the electric power polarity and directly exports to the various pilot lamp on the panel board of instrument terminal;
Described CAN signaling module, hardware is configured to: 8-bit microprocessor, CAN Centralized Controller, signal isolation drive module, RS232 communication module.In this module, micro-processing is carried out communication by mode and the CPU main control module of serial communication, according to the parameter information of input, transmit constantly indications and the message information that CAN bus will send, micro-processing is sent instrument terminal transmitted signal by the requirement of CAN bus, first this signal carries out photoelectricity isolation, and then drive processing, directly send the terminal of instrument to;
Described contact expansion output module, by parallel I/O conversion receiver, relay drive circuit, relay contact conversion electric power polar circuit, formed, parallel I/O conversion receiver receives the data that CPU module transmits, and by the data allocations of accepting to relay drive circuit, driving circuit removes to drive pilot relay again, relay is exported 30 road independent contact signals, accumulator connection on simulation car load, ignition switch, light switch function.
Described man-machine interface information display module also comprises that a capacity is at least the storer of 1G, stores the test of various instrument and the correlation parameter of fundamental error in storer.
Advantage of the present invention is: the present invention carries out the overall situation by CPU control module to other 8 modules and controls, constantly according to the steering order in man-machine interface information display module, control the output of modules, can all kinds of parameters of system be inputted, be revised and preserve.Meet long duration test and the fundamental error testing requirements of any kind automobile instrument.The present invention is a kind of Novel automobile instrument multi-function test stand, can meet arbitrarily mileometer in various types of automobiles instrument, tachometer gage, water-thermometer, fuel gauge, oil manometer, rain glass, voltage table, each pilot lamp of panel board, throw light on long duration test repeatedly and fundamental error testing requirements, and simple operations.In system design process, take into full account human engineering factor, in parameter input process, incorporate mistake proofing design, incorrect if any data input, refusal parameter is inputted and reports to the police.
Accompanying drawing explanation
Fig. 1 is hardware structure diagram of the present invention.
Fig. 2 is FB(flow block) of the present invention.
Fig. 3 is long duration test handling procedure FB(flow block).
Fig. 4 is setting parameter handling procedure FB(flow block).
Embodiment
The present invention is a kind of automobile instrument integral testing table, always has 9 large module compositions.9 large modules are respectively: man-machine interface information display module, CPU main control module, frequency square-wave signal generation module, network resistor are controlled submodule, pwm signal generation module, programmable voltage output module, meter lamp detection module, contact expansion output module, CAN signaling module.
CPU main control module, the command centre that the data processing that this module is testing equipment and instruction are sent.The control core of CPU main control module is: the PLC of 64, PLC carries out data communication with man-machine interface touch screen constantly.Utilize the least-significant byte output port of the Y0-Y7 of PLC to carry out sheet to each signal generating module and translate code selectively, utilize the Y10-Y17 of PLC and 16 bit synchronizations of Y20-Y27 and frequency square-wave signal generation module, resistor network module, pwm signal generation module, programmable voltage output module, meter lamp detection module, contact expansion output module, CAN signaling module to carry out exchanges data and control in the mode of transmitting that walks abreast.
Pwm signal generation module hardware is configured to: 8 central processing units, photoelectric isolating circuit, signal amplification circuit, frequency amplitude Circuit tuning.Frequency size data, the dutycycle size transmitting according to CPU main control module carried out software and processed synthetic rear satisfactory signal, then carries out photoelectricity isolation, then drives processing, and the signal of handling well sends the terminal of instrument to.
Man-machine interface information display module, module composition is: the very color touch product of hardware using, by configuration software, programme.Man-machine interface information display module, for inputting test dictation and various test parameters, dynamic monitoring parameter display, process of the test simulation, guiding testing crew carries out associative operation prompting.This module is mainly to have implemented by configuration software.
Frequency signal is controlled submodule, and mainly by parallel I/O conversion receiver, frequency-fixed signal generator, binary-coded decimal rate multiplier, 1/10 frequency divider, photoelectric isolating circuit, signal amplification circuit, frequency amplitude Circuit tuning form.Parallel I/O conversion receiver receives the data that CPU main control module transmits, and by the data allocations of accepting to binary-coded decimal rate multiplier, binary-coded decimal rate multiplier synthesizes satisfactory frequency signal in conjunction with 1/10 frequency divider and frequency-fixed signal generator.Synthetic frequency signal is undertaken after anti-interference process by photoelectric isolating circuit, and by signal amplification circuit and frequency amplitude Circuit tuning, final output frequency square-wave signal is exported to instrument terminal.
Network resistor is controlled submodule, mainly contains parallel I/O conversion receiver, 20 kinds of standard precision resistances, 20 relay, relay drive circuits compositions that switch precision resistance.Parallel I/O conversion receiver receives the data that CPU module transmits, and by the data allocations of accepting to relay drive circuit, driving circuit drives relay to move, and 20 kinds of precision resistances is connected to switch and synthesize, the complete instrument test parameters of the resistance signal requirement of final output.
Programmable voltage is controlled submodule, mainly contains parallel I/O conversion receiver, pressure regulation sample circuit, voltage stabilizing circuit, current rectifying and wave filtering circuit.First this module is converted into galvanic current source by current rectifying and wave filtering circuit by alternating current, then according to parallel I/O conversion receiver, receive the data that CPU module transmits, and by the data allocations of accepting to pressure regulation sample circuit, in conjunction with voltage stabilizing circuit, programmable voltage signal arbitrarily can be synthesized again, the testing requirements of voltage table on automobile instrument can be met.
Meter lamp is controlled submodule, mainly contains parallel I/O conversion receiver, relay drive circuit, relay contact conversion electric power polar circuit.Parallel I/O conversion receiver receives the data that CPU module transmits, and by the data allocations of accepting to relay drive circuit, driving circuit goes to drive again controls often opening or normally closed contact of conversion electric power polarity relay.Switch the electric power polarity and directly export to the various pilot lamp on the panel board of instrument terminal.
CAN signaling module, hardware is configured to: 8-bit microprocessor, CAN Centralized Controller, signal isolation drive module, RS232 communication module.In this module, micro-processing is carried out communication by mode and the CPU main control module of serial communication, according to the parameter information of input, transmits constantly indications and the message information that CAN bus will send.Micro-processing is sent instrument terminal transmitted signal by the requirement of CAN bus.First this signal carries out photoelectricity isolation, and then drives processing, directly sends the terminal of instrument to.
Contact expansion output module, mainly contains parallel I/O conversion receiver, relay drive circuit, relay contact conversion electric power polar circuit.Parallel I/O conversion receiver receives the data that CPU module transmits, and by the data allocations of accepting to relay drive circuit, driving circuit removes to drive pilot relay again.Relay is exported 30 road independent contact signals, accumulator connection on simulation car load, ignition switch, light switch function.
It is synthetic that the data that frequency signal generation module sends according to CPU main control module are carried out frequency signal, and the line output of going forward side by side is controlled.
It is synthetic that the data that network resistor output module sends according to CPU main control module are carried out resistance signal, and the line output of going forward side by side is controlled.
The data that programmable voltage output module sends according to CPU main control module are carried out the synthetic of programmable voltage signal, and the line output of going forward side by side is controlled.
The meter lamp idsplay order that meter lamp detection module sends according to CPU main control module, exports control.
It is synthetic that the data that CAN signaling module sends according to CPU main control module are carried out CAN signal, and the line output of going forward side by side is controlled.
It is synthetic that the data that contact expansion module sends according to CPU main control module are carried out contact expansion, and the line output of going forward side by side is controlled.
CPU main control module carries out the overall situation to other 8 modules to be controlled, and constantly according to the instruction of Keyboard Control module input, controls the output of modules.This system CPU has been equipped with the EEPROM of 1G, and this capacity can be stored the test parameters of 100 kinds of instrument, can carry out the modification of each test parameters by the very color touch-screen in information display module, meets the test demand of any kind automobile instrument.
Novel automobile instrument multi-function test stand of the present invention, long duration test and fundamental error experiment process are as follows:
1. program initialization, man-machine interface shows instrument title and the piece number before shutdown, and shows " test interface ", " detection interface, " " parameter input " " debugging interface " four interface switching keys.As current test-meter title is consistent with demonstration information with piece number, directly enter step 2..As need are changed test-meter kind, title and piece number, clicking " piece number replacing " selects to indicate, the quick interface of control system automatic spring " piece number is revised, selected ", on this interface, can carry out piece number name modifications and selection, press windows system's operating mode, exit quick interface, enter step 2..
2. at the main interface of system, according to test demand, determine it is to carry out long duration test, parameter input, debug function, a certain function of fundamental error, respond respectively touch-control " test interface ", " detection interface, " " parameter input " " debugging interface " function button, enter related interfaces and carry out correlation function operation.
3. enter after " test interface ", touch-control " test starts ", " test suspends ", " reset " function key are controlled process of the test.On operation and control interface, " battery unlatching " " igniting is opened ", " battery is closed " " igniting is closed " function key difference simulated automotive car load are controlled automobile storage battery and ignition switch.As wanted, exit trystate, only need to click on Key experiments interface and " close " sign, exit trystate, 2. the main interface of access arrangement, enter step.
4. enter after " detection interface ", according to the content of the test of fundamental error, the little tables such as the mileometer in instrument assembly, tachometer gage, fuel gauge, water-thermometer, rain glass, voltage table are carried out to the detection of fundamental error.After detection, only need to click on Key experiments interface and " close " sign, exit fundamental error detected state, 2. the main interface of access arrangement, enter step.
5. enter after " parameter input ", according to content of the test, respectively to each grade of test parameters sizes of little table such as the mileage in instrument assembly, rotating speed, fuel oil, water temperatures, the parameter such as instrument panel lamp system, reset parameter, signal kinds, test number (TN), gear test interval, each test function unlatching of instrument arranges and selects.Determine parameter after setting completed, release parameter state is set, the test relevant controls such as intertrial interval require to carry out signal kinds and design parameter input.Only need to click on Key experiments interface and " close " sign, exit trystate, 2. the main interface of access arrangement, enter step.
6. enter after " debugging interface ", can carry out manual test and correction to the hardware circuit of testing equipment, be convenient to equipment debugging and maintenance.As need exit, only need to click on Key experiments interface and " close " sign, exit equipment debugging state, 2. the main interface of access arrangement, enter step.
7. at the main interfacial state of system, can shutdown system power supply.
Aforesaid Novel automobile instrument multi-function test stand data parameters input method, wherein said data setting handling procedure flow process is as follows:
(1) enter " parameter input " interface, according to testing requirements, respectively test parameters is arranged.As to mileometer, tachometer gage, water-thermometer, fuel gauge, rain glass, oil pressure gauge, voltage table relative parameters setting, enter step (2).As (3) " test parameters setting " entered to step.As " reset mode " to after test arranges, (4) come in enters step.
(2) touch-control " input of mileometer parameter " operating key, system ejects quick window, first selects signal kinds, after signal kinds has been confirmed, as required, selects each grade of test parameters of input mileometer.After data input, return to " parameter input " interface.Note: 1., in parameter input process, incorporate mistake proofing design, incorrect if any data input, refusal parameter is inputted and reports to the police.2. tachometer gage, water-thermometer, fuel gauge, rain glass, oil pressure gauge, voltage table, CAN signaling module correlation parameter are inputted the input operation of similar mileometer parameter.
(3) touch-control " test parameters setting " operating key, system enters test parameters and inputs sub-interface.At this interface, can be respectively the parameters such as the test cycle gear of mileometer, tachometer gage, water-thermometer, fuel gauge, rain glass, oil pressure gauge, voltage table, gear interval time, test number (TN), shield test reactor kind be arranged.After setting completed, return to " parameter input " interface.
(4) touch-control " reset mode setting " operating key, system enters reset mode interface is set.At this interface, can arrange mileometer, tachometer gage, water-thermometer, fuel gauge, rain glass, oil pressure gauge, voltage table reset mode.Can arrange instrument accumulator, ignition switch, illumination condition.After setting completed, return to " parameter input " interface.
Embodiment mono-
This implements concrete example: 08 section is gently blocked full-electronic instrument (piece number: 58QN) carry out long duration test, long duration test comprises: to mileometer, tachometer gage, water-thermometer, fuel gauge, rain glass A, rain glass B, sky blue mark totally 7 little tables; Each pilot lamp of panel board, illuminating lamp are carried out to complete bright and complete dark two states, carry out respectively the long duration test of different number of times.Process is as follows:
1. from control system, recall this instrument assembly piece number code, system is written into data buffer by all test parameterss of this phenotype automatically.
2. as test parameters and correlation parameter are modified, please click " parameter input " button, enter parameter input subroutine interface.Such as mileometer, tachometer gage, water-thermometer, fuel gauge, sky blue table, rain glass, voltage table cycle index, race and gear in " long duration test setting " interphase under " parameter input " sub-interface, back and forth the parameter such as race and interval time, test shielding arranges.
For example to " mileometer setting parameter " interphase under " parameter input " sub-interface to each grade of parameter size of mileometer arrange, gear chooses and is configured.
3. data after setting completed, exit data state are set, and click " long duration test " function key, enter long duration test interface.Click " test starts " function key, system is according to the automatic starting characteristics test of correlation parameter of setting.Automatic monitoring system data parameter in process of the test, each functional status of dynamic similation, the state of convenient operation person and actual instrument is compared.After test number (TN) all arrives, system stops test, enters reset mode.
The fundamental error parameter request of each little table of 58QN automobile instrument is as following table:
Table 1
In the process that reality detects, respectively each parameter of control module output is detected and measured, the data after measurement are as following table:
Table 2
According to the data of table 1 and table 2, compare and can significantly find out: Novel automobile instrument multi-function test stand can be good at meeting the long duration test of automobile instrument, all kinds of parameters are completely in technology controlling and process precision.The precision of frequency signal can be controlled at 0.1%, be controlled at ± 0.3 Ω of the precision of resistance signal, be controlled at ± 0.3V of the precision of programmable voltage signal.In addition, this testing equipment also compares with special-purpose automobile instrument detection and testing equipment in automobile instrument field: the number percent that precision improves refers to following table:
Table 3
| Parameter name | General checkout equipment parameters precision error | Novel automobile instrument multi-function test stand trueness error | Precision improves number percent | Remarks |
| Frequency signal | 0.2%Hz | 0.1%Hz | 50% | ? |
| Resistance signal | ±0.5Ω | ±0.3Ω | 40% | ? |
| Programmable voltage signal | ±0.5V | ±0.3V | 40% | ? |
Claims (2)
1. a Novel automobile instrument comprehensive test system, is characterized in that it includes following functional module:
CPU main control module, the command centre sending for data processing and the instruction of testing equipment;
Man-machine interface information display module, for inputting test dictation and various test parameters, dynamic monitoring parameter display, process of the test simulation, guiding testing crew carries out associative operation prompting;
Pwm signal generation module, is connected with automobile instrument assembly, and it is synthetic that the data that send according to CPU main control module are carried out frequency signal, and the line output of going forward side by side is controlled;
CAN signaling module, is connected with automobile instrument assembly, and it is synthetic that the data that send according to CPU main control module are carried out CAN information, and the line output of going forward side by side is controlled;
Frequency square-wave signal generation module, is connected with automobile instrument assembly, and it is synthetic that the data that send according to CPU main control module are carried out frequency signal, and the line output of going forward side by side is controlled;
Network resistor output module, is connected with automobile instrument assembly, and it is synthetic that the data that send according to CPU main control module are carried out resistance signal, and the line output of going forward side by side is controlled;
Programmable voltage output module, is connected with automobile instrument assembly, and it is synthetic that the data that send according to CPU main control module are carried out programmable voltage signal, and the line output of going forward side by side is controlled;
Meter lamp detection module, is connected with automobile instrument assembly, and the meter lamp idsplay order sending according to CPU main control module, exports control;
Contact expansion output module, is connected with automobile instrument assembly, sends information carry out contact output control, simulated automotive battery switch, ignition switch, light switch function according to CPU main control module;
The control core of described CPU main control module is: the PLC of 64, PLC carries out data communication with man-machine interface touch screen constantly, utilize the least-significant byte output port of the Y0-Y7 of PLC to carry out sheet to each signal generating module and translate code selectively, utilize the Y10-Y17 of PLC and 16 bit synchronizations of Y20-Y27 and frequency square-wave signal generation module, resistor network module, pwm signal generation module, programmable voltage output module, meter lamp detection module, contact expansion output module, CAN signaling module to carry out exchanges data and control in the mode of transmitting that walks abreast;
Described pwm signal generation module hardware is configured to: 8 central processing units, photoelectric isolating circuit, signal amplification circuit, frequency amplitude Circuit tuning, frequency size data, the dutycycle size transmitting according to CPU main control module carried out software and processed synthetic rear satisfactory signal, carry out again photoelectricity isolation, then drive processing, the signal of handling well sends the terminal of instrument to;
Described man-machine interface information display module adopts very color touch-screen, and programme by configuration software, man-machine interface information display module, for inputting test dictation and various test parameters, dynamic monitoring parameter display, process of the test simulation, guiding testing crew carries out associative operation prompting;
Described frequency signal is controlled submodule, by parallel I/O conversion receiver, frequency-fixed signal generator, binary-coded decimal rate multiplier, 1/10 frequency divider, photoelectric isolating circuit, signal amplification circuit, frequency amplitude Circuit tuning forms, parallel I/O conversion receiver receives the data that CPU main control module transmits, and by the data allocations of accepting to binary-coded decimal rate multiplier, binary-coded decimal rate multiplier synthesizes satisfactory frequency signal in conjunction with 1/10 frequency divider and frequency-fixed signal generator, synthetic frequency signal is undertaken after anti-interference process by photoelectric isolating circuit, by signal amplification circuit and frequency amplitude Circuit tuning, final output frequency square-wave signal is exported to instrument terminal,
Described network resistor is controlled submodule, by parallel I/O conversion receiver, 20 kinds of standard precision resistances, 20 relay, relay drive circuits that switch precision resistance, formed, parallel I/O conversion receiver receives the data that CPU main control module transmits, and by the data allocations of accepting to relay drive circuit, driving circuit drives relay to move, 20 kinds of precision resistances are connected to switch and synthesize, the resistance signal of final output meets the requirement of instrument test parameters completely;
Described programmable voltage is controlled submodule, by parallel I/O conversion receiver, pressure regulation sample circuit, voltage stabilizing circuit, current rectifying and wave filtering circuit, formed, first this module is converted into galvanic current source by current rectifying and wave filtering circuit by alternating current, then according to parallel I/O conversion receiver, receive the data that CPU main control module transmits, and by the data allocations of accepting to pressure regulation sample circuit, in conjunction with voltage stabilizing circuit, synthesize programmable voltage signal arbitrarily again, for meeting the testing requirements of voltage table on automobile instrument;
Described meter lamp is controlled submodule, by parallel I/O conversion receiver, relay drive circuit, relay contact conversion electric power polar circuit, formed, parallel I/O conversion receiver receives the data that CPU main control module transmits, and by the data allocations of accepting to relay drive circuit, driving circuit goes to drive again controls often opening or normally closed contact of conversion electric power polarity relay, switches the electric power polarity and directly exports to the various pilot lamp on the panel board of instrument terminal;
Described CAN signaling module, hardware is configured to: 8-bit microprocessor, CAN Centralized Controller, signal isolation drive module, RS232 communication module, in this module, microprocessor carries out communication by mode and the CPU main control module of serial communication, according to the parameter information of input, transmit constantly indications and the message information that CAN bus will send, microprocessor send instrument terminal transmitted signal by the requirement of CAN bus, first this signal carries out photoelectricity isolation, and then drive processing, directly send the terminal of instrument to;
Described contact expansion output module, by parallel I/O conversion receiver, relay drive circuit, relay contact conversion electric power polar circuit, formed, parallel I/O conversion receiver receives the data that CPU main control module transmits, and by the data allocations of accepting to relay drive circuit, driving circuit removes to drive pilot relay again, relay is exported 30 road independent contact signals, accumulator connection on simulation car load, ignition switch, light switch function.
2. comprehensive test system for automobile instruments according to claim 1, is characterized in that: described man-machine interface information display module also comprises that a capacity is at least the storer of 1G, stores the test of various instrument and the correlation parameter of fundamental error in storer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111308238B (en) * | 2020-02-07 | 2022-08-05 | 中电科信息产业有限公司 | Battery simulator and system of electric bicycle and charger detection method |
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