CN103336524A - Test and diagnosis device for electric control system of hydraulic retarder - Google Patents
Test and diagnosis device for electric control system of hydraulic retarder Download PDFInfo
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Abstract
The invention discloses a test and diagnosis device for an electric control system of a hydraulic retarder. The test and diagnosis device comprises a central processing module, a man-machine interface module, an interface module, a signal selection module and a CAN (controller area network) communication module, wherein the signal selection module is connected with the interface module, the CAN communication module and the central processing module; the interface module and the CAN communication module are both connected with the central processing module; the central processing module is connected with the man-machine interface module; the signal selection module is connected with peripheral devices of a whole-vehicle system and an electronic control device of the hydraulic retarder; and the peripheral devices of the whole-vehicle system comprise a vehicle signal instruction device, a vehicle signal indication device, a CAN bus, a peripheral device executor, a peripheral device instruction device, a peripheral device indication device and a peripheral device sensor. The test and diagnosis device can be used for manually or automatically testing the electric control system of the hydraulic retarder, and has the characteristics of accurate data acquisition and calculation, small error, simplified operation and manpower saving.
Description
[technical field]
The present invention relates to vehicle testing and diagnostic techniques field, particularly a kind of Retarder electric-control system test and diagnostic device.
[background technology]
Along with the raising of travel safety requirement and the promotion of policy, Retarder will progressively be applied to tourism motor passenger vehicle, engineering with on the vehicles such as car, heavy carrier as a kind of auxiliary braking technology of main flow.This product can improve the hill path traffic safety, alleviates driving intensity, cuts operating costs.
The decelerability of Retarder is its topmost performance index.Decelerability can only rely on driver's subjective judgement to go out size, and obtaining exactly, there are some difficulties in the retarded velocity data.There are three difficult points in the on-the-spot accurately test of decelerability: 1. driver's operation complexity is easy to make mistakes; 2. instrument cost height and connection are complicated, spended time; 3. test is manually carried out, and efficient is low.
The electric-control system of Retarder is by electronic-controlled installation, actuator (output device 1), command device (input equipment 1), indicating device (output device 2), sensor (input equipment 2), formations such as CAN communication can realize self classification deceleration and constant speed function of retarder.And if vehicle ABS, E-Gas, electric brake, the car load brake system, physical system or CAN system compatibles such as instrument can be realized the co-ordination with car load.But, because all can causing retarder self or coordination function to reach performance unusually, the fault of factors such as circuit and general parts descends, bring inconvenience for user's traffic safety.For electric-control system, the characteristic of complicated actuator also will cause properties of product unusual because of various environment (vibration, temperature are impacted etc.) reason variation.
For the complicacy of electric-controlled system fault, the service station personnel rely on multimeter and servicing manual, spare part to carry out fault to judge, will expend a large amount of material resources and time, cause time and economically loss to the user.For this reason, producer solves the product bug problem for the attendant provides the special test diagnostic instrments both at home and abroad, improves the product maintenance ability.
Existing separate diagnostic testing tool can be divided into two big classes, and wherein the electronic-controlled installation that a class can alternative system checks and simulates the system works situation.This series products can effectively detect the problem of existing external devices and signal, but can't read historical failure.
Another kind of diagnostic test device then need be by the electronic-controlled installation of system, by carrying out communication with system, and failure code that can memory that reading system is stored, and show after failure code is converted to failure condition, partly substituted the effect of servicing manual.
In sum, existing diagnostic test device can not solve following problem:
1. assist the vehicle deceleration performance automatic test.
2. the emulation of electronic-controlled installation detects.
3. the Performance Detection of complicated actuator.
[summary of the invention]
At the problems referred to above, the purpose of this invention is to provide a kind of test and diagnostic automaticity height, easy to operate, the Retarder electric-control system test and diagnostic device that efficient is high is to solve the problems of the technologies described above.
To achieve these goals, the present invention takes following technical scheme:
A kind of Retarder electric-control system test and diagnostic device comprises central processing module, human-computer interface module, interface module, signal selection module and CAN communication module; Described signal selection module connection interface module, CAN communication module and central processing module, described interface module all is connected described central processing module with the CAN communication module, and described central processing module connects described human-computer interface module; Interface module comprises: analog signal detection unit, switching signal detecting unit, switching signal driver element, car load signal processing unit and driving and detecting unit; Described analog signal detection unit, the physical quantity signal that sends for detection of sensor; Described switching signal detecting unit is used for state to each switchgear of system and detects or the Artificial switch state is carried out from detecting; Described switching signal driver element is used for the Full Vehicle System indicating device is driven; Described car load signal processing unit is used for original car load signal is converted to the discernible standard signal of central processing module; Described driving and detecting unit are used for driving the actuator of Full Vehicle System, and detect the working current of actuator; Described signal selection module comprises many group digital-to-analogue switch elements and many group electronic switch units.
The present invention further improves and is: described signal selection module connects the peripheral components of Full Vehicle System and the electronic-controlled installation of Retarder; The peripheral components of described Full Vehicle System comprises the command device of signals of vehicles, indicating device, CAN bus, the actuator of peripheral components, the command device of peripheral components, the indicating device of peripheral components and the sensor of peripheral components of signals of vehicles.
The present invention further improves and is: the analog signal detection unit of described central processing module connection interface module, switching signal detecting unit, switching signal driver element, car load signal processing unit and driving and detecting unit; Central processing module selects the disconnection of digital-to-analogue switch element corresponding in the module, electronic switch unit with closed by control signal, corresponding device and/or the electronic-controlled installation of Retarder in the peripheral components that connects Full Vehicle System by certain or a plurality of unit in the interface module with the control central processing unit.
The present invention further improves and is: described central processing module adopts the XC166 of Infineon series 16 8-digit microcontrollers.
The present invention further improves and is: central processing module is connected with the analog signal detection unit, and digital-to-analogue switch element corresponding in signal selection module is connected with the external sensor simulating signal of electric-control system, realizes the detection of system physical amount; Central processing module detects supply voltage by bleeder circuit with after one tunnel analog signal detection unit is connected; Central processing module detects the current conversion voltage signal by sampling resistor with after one tunnel analog signal detection unit is connected; Central processing module is connected with the switching signal detecting unit, the digital-to-analogue switch in signal selection module, and realize two kinds of connected modes: 1. the switching signal with the ECU (Electrical Control Unit) device is connected, and realizes the detection to various switches; 2. be connected with the signal of Artificial switch, realize the detection certainly of simulating signal; Central processing module is connected with the car load signal processing unit, and the digital-to-analogue switch in signal selection module is connected with the associated vehicle signal, realizes the detection to the car load signal; Central processing module is connected with the switching signal driver element, and the digital-to-analogue switch in signal selection module is connected with indicating device, realizes driving and detection to parts; The electronic switch contact of the pulse-width signal of central processing module in the output of pulsewidth modulation interface and driving and detecting unit, signal selection module, the testing circuit of electronic switch are connected with actuator, realize actuator driven and detection; The general digital output interface of CPU (central processing unit) is connected with the control end of digital-to-analogue switch in the signal selection module, realize closure and the disconnection of each digital-to-analogue switch in the signal selection module, i.e. the connecting and disconnecting of analog quantity or switching value signal and switch or analogue detection circuitry; Be connected with the control end of electronic switch in the signal selection module, realize the conducting of make and break contact and end the i.e. connecting and disconnecting of actuator and driving and detecting unit.
The present invention further improves and is: when carrying out the manual test of vehicle performance, make the first digital-to-analogue switch and the second digital-to-analogue switch closure in the digital-to-analogue switch element, the 3rd digital-to-analogue switch disconnects, and the gear signal one tunnel of command device offers electronic-controlled installation through the first digital-to-analogue switch, the second digital-to-analogue switch; One the tunnel through the first digital-to-analogue switch and switching signal detecting unit to central processing module for detection of; All of electronic-controlled installation and peripheral components are connected and meet former car state; The test and diagnostic device is monitored synchronously to peripheral components and CAN signal.
The present invention further improves and is: when carrying out the automatic test of vehicle performance, signal selection module at first connects switching; According to the measurement circuit requirement, central processing unit is controlled the first digital-to-analogue switch and is disconnected the second digital-to-analogue switch closure, the 3rd digital-to-analogue switch closure; Behind the 3rd digital-to-analogue switch, the one tunnel offers electronic-controlled installation through the second digital-to-analogue switch to the digital quantity output signal of central processing unit through the switching signal driver element, and one the tunnel is used for the signal self check through the switching signal detecting unit to central processing module; Central processing module and switching signal driver element replace command device to be connected with electronic-controlled installation, other peripheral components with meet former car state being connected of electronic-controlled installation; The test and diagnostic device is monitored synchronously to peripheral components and CAN signal.
The present invention further improves and is: central processing module is connected with external signal through interface module, signal selection module, by operation and the demonstration of human-computer interface module, realizes the working condition of system unit is checked and simulates.
The present invention further improves and is: central processing module carries out communication through interface module, signal selection module, CAN communication module and Retarder electronic-controlled installation, is used for reading system storage failure sign indicating number or monitors real time data, judges fault.
The present invention further improves and is: central processing module is all simulated or the partial simulation external signal is carried out half emulation testing of Retarder electronic-controlled installation.
CPU (central processing unit) is connected with the CAN module of car load and electronic-controlled installation, realizes four functions.
1 reads the diagnostic trouble code of electronic-controlled installation storage
2. when driving a vehicle or stopping, the data monitoring of car load and electronic-controlled installation.
3. when stopping, the analogue simulation of car load dynamic data
4. with the communication of car load or electronic-controlled installation, be used for automatic diagnosis and performance calculating.
CPU (central processing unit) is connected with human-computer interface module, realizes following function:
1. human-computer interaction function.Mutual with the operator, operator's instruction is passed to CPU (central processing unit), real time data, Calculation results that central processing module is passed back show.
2. database function.Call the maintenance electronics literary composition retaining of storage according to fault type, can replace servicing manual, troubleshooting process and method are checked conveniently.
The connected mode of described device and electronic-controlled installation system: proving installation is connected with external signal by wire harness one end, and the other end is connected with electronic-controlled installation.Proving installation is realized diagnosis and solution to different faults by the connected mode of switching signal and interface module or electronic-controlled installation.
The connected mode one of proving installation and system: the central processing unit of proving installation circuit after testing is connected with external signal, by operation and the demonstration of human-computer interface module, realizes the working condition of system unit is checked and simulates.Device can check out electric power system, sensor, and the problem of parts such as actuator or circuit can detect for most of type fault.Sensor installation and signal is connected with the analog signal detection unit in system can be realized the performance test of complicated actuator.Electronic-controlled installation excitation actuator simultaneously, the survey sensor signal obtains encouraging the data with response relation thus.To encourage with the response relation data and analyze, contrast the quality that to judge actuator with the expectation index.According to fault characteristic (chance failure), automatically required signal continuous data is monitored and storage during driving, by data readback, judge external signal and unit failure.
The connected mode two of proving installation and system: only need be connected with the CAN line, carry out communication with the system electric control device, can read system's storage failure sign indicating number or monitor real time data, the judgement fault.
The connected mode three of proving installation and system: can all simulate or the partial simulation external signal is carried out half emulation testing of electric-control system.Under this kind pattern, with the part physical signalling, CAN signal and electronic-controlled installation disconnect, and are substituted by proving installation.But the proving installation analog switch, signals such as CAN information of vehicles.The test item of proving installation is once setting, need not manually-operated, just carry out every test automatically successively, and judge that item by item if a certain defective, test is ended.Qualified, then continue next test event up to end of test (EOT).
With respect to prior art, the present invention has following beneficial effect: 1. vehicle under the ruuning situation, under the situation that does not change controller and peripheral components, has not been realized searching fast and solving of fault, has saved cost of serving and user's quality time.2. device has the driving recording function, once use, can unattended down, to the continuous data recording of vehicle, the analysis and judgement of being convenient to drive a vehicle and going wrong.
Judge demand for satisfying field performance, solve the problem of artificial testing complex, time-consuming, poor accuracy, also proposed based on a kind of vehicle of proving installation and the method for testing performance of retarder coupling: communications such as proving installation and electronic-controlled installation, engine, according to calculating the deceleration time that throttle, the speed of a motor vehicle etc. carries out under the specified criteria.
After electronic-controlled installation, proving installation are connected on request with signals of vehicles, meet the electronic-controlled installation service condition, can require to assist test automatically according to dispatching from the factory to vehicle.The driver to given state, substitutes vehicle operating the driver by proving installation and carries out complex operations, provides a series of instructions, electronic-controlled installation and system's corresponding actions, the real-time monitor vehicle information of proving installation.Finish when test, data are calculated automatically, can make the performance judgment of a certain function.The useful achievement of this method is, simplified driver's operation, and degree of fatigue is low; Data acquisition is accurate with calculating, and error is little; Replace instrumentation, simplify the operation and save manpower.
[description of drawings]
Fig. 1 proving installation is connected block diagram with electric-control system;
Fig. 2 vehicle performance test block diagram;
Fig. 3 decelerability is judged synoptic diagram;
Fig. 4 electronic-controlled installation test block diagram;
Fig. 5 electronic-controlled installation test flow chart;
The block diagram of Fig. 6 system peripherals signal testing;
The block diagram of Fig. 7 actuator test.
[embodiment]
See also Fig. 1 to shown in Figure 6, Retarder electric-control system test and diagnostic device of the present invention comprises central processing module, human-computer interface module, power module, interface module, signal selection module and CAN communication module.
Central processing module is by microprocessor, the general digital input interface, and the general digital output interface, the analog quantity input interface is caught the comparer interface, the width modulation interface, serial communication interface and CAN interface constitute.
Interface module comprises:
The analog signal detection unit, the switching signal detecting unit, the switching signal driver element, the car load signal processing unit drives and detecting unit.
The analog signal detection unit, the physical quantity signal that sends for detection of sensor;
The switching signal detecting unit is used for state to each switchgear of system and detects or the Artificial switch state is carried out from detecting;
The switching signal driver element is used for system's indicating device is driven;
The car load signal processing unit is used for original car load signal is converted to the discernible standard signal of central processing module;
Drive and detecting unit, be used for the actuator of drive system, and detect the working current of actuator.
Signal selection module comprises many group digital-to-analogue switch elements and many group electronic switch units.
The CAN communication module comprises photoelectricity isolated location and drive circuit unit.
Power module comprises the voltage voltage regulation unit, and pressure unit is isolated the communication power supply unit, the analog power unit.Voltage module, according to human-computer interface module, central processing module, interface module, the voltage of communication module etc. and power demand provide reliable power supply.
Central processing module is with after the analog signal detection unit is connected, and corresponding digital-to-analogue switch element in signal selection module is connected the detection of realization system physical amount with the external sensor simulating signal of electric-control system.Central processing module detects supply voltage by bleeder circuit with after one tunnel analog signal detection unit is connected.Central processing module detects the current conversion voltage signal by sampling resistor with after one tunnel analog signal detection unit is connected.
Central processing module is with after the switching signal detecting unit is connected, the digital-to-analogue switch in signal selection module, and realize two kinds of connected modes: 1. the switching signal with the ECU (Electrical Control Unit) device is connected, and realizes the detection to various switches; 2. be connected with the signal of Artificial switch, realize the detection certainly of simulating signal.
Central processing module is with after the car load signal processing unit is connected, and the digital-to-analogue switch in signal selection module is connected with the associated vehicle signal, realizes the detection to the car load signal.
Central processing module is with after the switching signal driver element is connected, and the digital-to-analogue switch in signal selection module is connected with indicating device, realizes driving and detection to parts.
The electronic switch contact of the pulse-width signal of central processing module in the output of pulsewidth modulation interface and driving and detecting unit, signal selection module, the testing circuit of electronic switch are connected with actuator, realize actuator driven and detection.
The general digital output interface of CPU (central processing unit) is connected with the control end of digital-to-analogue switch in the signal selection module, realize closure and the disconnection of each digital-to-analogue switch in the signal selection module, i.e. the connecting and disconnecting of analog quantity or switching value signal and switch or analogue detection circuitry; Be connected with the control end of electronic switch in the signal selection module, realize the conducting of make and break contact and end the i.e. connecting and disconnecting of actuator and driving and detecting unit.
See also shown in Figure 1, the CPU module that this device adopts is the automobile specified module, possesses abundant general digital input interface, general digital output interface, analog quantity input interface, catch the comparer interface, the width modulation interface, serial communication, CAN interface, on the basis of satisfying the proving installation demand, reserve certain hardware interface and software programming space and be used for expansion.
Analog signal detection unit in the interface module, by sampling or bleeder circuit, filtering circuit, discharge circuit etc. will original signal handle with amplify after offer the analog quantity input interface of central processing module.The physical quantity that can survey has supply voltage, aanalogvoltage, load current, sensor signal etc.
The build-out resistor dividing potential drop is at first passed through in the measurement of supply voltage, and with by low-pass filtering, last ratio is amplified to central processing module.The current measurement of power termination at first is converted to voltage signal through sampling resistor, and with by low-pass filtering, last ratio is amplified to central processing module.
The switching signal detecting unit of interface module drives signal by pull-up resistor or pull down resistor circuit, then through photoelectricity isolate with pull-up circuit after, the general digital input interface that offers central processing module for detection of.
The general digital output interface of central processing module is exported high or low level, behind the reverse driven of switching signal driver element, drive the control end of the electronic switch in the signal selection module, control electronic switch the load end conducting or end, load equipment and power supply are switched on or switched off, and realize the driving to load.Electronic switch can provide feedback of status for central processing module, if open circuit or short trouble appear in load, then can realize reporting to the police.
The car load signal processing unit of interface module according to signal characteristic, is converted to original signal the general digital input interface that central processing module is provided behind the standard signal by reverse protection, pull-up circuit, low-pass filtering, isolating amplifier circuit.
Central processing module as calculated after, the output pulse width modulation signal, after the phase inverter of the driving of interface module and detecting unit is isolated amplifications, bleeder circuit adjustment, triode and is driven, the power device real-time response, realization is to the driving of power termination.The detection of load current realizes by sampling resistor and analog detection unit.
The CAN communication module comprises photoelectricity isolated location, drive circuit unit.The CAN interface of central processing module is connected with the drive circuit unit of CAN communication module, after the amplification conversion, is connected with the CAN bus of system peripherals through the photoelectricity isolated location.
The power module of device comprises Overvoltage protecting unit, 5 volts of pressure units, 5V communication power supply unit, 5 volts of analog power unit.Power supply is 5 volts through pressure unit with voltage transitions behind the overvoltage protected location, and 5 volts are used for central processing module, buffer circuit etc.5 volts of power supplys are 5 volts-1 of isolation through the communication power supply cell translation, are used for serial communication and CAN communication module.5 volts of power supplys are 5 volts-2 of isolation through the analog power cell translation, are used for analog quantity benchmark and amplifying circuit.
Apparatus of the present invention can be carried out manually with automatically testing of vehicle performance.Manual test is example with the decelerability test of Retarder, and step is as follows:
1, device is connected by wire harness with electronic-controlled installation, peripheral components, signals of vehicles, the car load CAN communication of Retarder.
2, device is defaulted as the manual test pattern, Fig. 2 vehicle performance test block diagram.
Default conditions or by human-computer interface module input make the digital-to-analogue switch 101 in the digital-to-analogue switch element, digital-to-analogue switch 201 closures, and digital-to-analogue switch 301 disconnects, and 5 gear signal one tunnel of command device offer electronic-controlled installation through 101,201; One the tunnel through 101 with the switching signal detecting unit to central processing module for detection of.All of electronic-controlled installation and peripheral components are connected and meet former car state.Proving installation is monitored synchronously to peripheral components and CAN signal.
3. manual test
Human-computer interface module is operated, switch to the data acquisition interface, driver or testing crew are according to the information that monitors (Retarder oil temperature, the speed of a motor vehicle) and carry out the various operations of retarder.
The vehicle test of manually slowing down under the highest gear.Testing crew is observed oil temperature, and the speed of a motor vehicle satisfies (speed of a motor vehicle is greater than 85 kilometers/hour, and accelerator open degree is less than 1%, and the oil temperature is greater than 80 degree) after the testing requirements, the highest gear of operation Retarder, and this instruction offers electronic-controlled installation through 101,201.Electronic-controlled installation instructs according to gear, by the work of signal selection module excitation actuator, impels braking system acts, and vehicle-state changes.The time relevant with vehicle-state, the speed of a motor vehicle, the sensor signal of throttle, CAN signal feed back to central processing module through signal selection module and are used for storage, and real-time curve shows on human-computer interface module simultaneously.
End of test (EOT) is controlled central processing module by the operation of human-computer interface module and is carried out performance calculating.For example, the interval time by 80 kilometers/hour to 60 kilometers/hour of curve acquisition, can calculate deceleration time and retarded velocity.
It is example that proving installation is tested with the decelerability of Retarder the automatic test of vehicle, and step is as follows: 1, test is prepared.
Proving installation is connected by wire harness with electronic-controlled installation, peripheral components, signals of vehicles, car load CAN communication.
2, circuit automaticallyes switch.
Device is defaulted as the manual test line, and after human-computer interface module was selected automatic test pattern, signal selection module at first connected switching.According to the measurement circuit requirement, central processing unit control 101 disconnects 201 closures, 301 closures.After 301, the one tunnel offers electronic-controlled installation through 201 to the digital quantity output signal of central processing unit through the switching signal driver element, and one the tunnel is used for the signal self check through the switching signal detecting unit to central processing module.Central processing module and switching signal driver element replace command device to be connected with electronic-controlled installation, other peripheral components with meet former car state being connected of electronic-controlled installation.Proving installation is monitored synchronously to peripheral components and CAN signal.
3, test automatically
Circuit switch finish after, vehicle operating to given state, is carried out starting test after parameter arranges, just can test automatically.During test, the various data of proving installation continuous recording.
The deceleration of 80 kilometers/hour to 60 kilometers/hour on vehicle test under the Retarder highest gear.Parameter is provided with 80 kilometers/hour of the initial speed of a motor vehicle, 60 kilometers/hour of the end of a period speed of a motor vehicle, retarded velocity range limit 1.2m/s
2, lower limit 0.8m/s
2, oily temperature lower limit 80 degree.
Central processing module measures signals such as certain constantly speed, throttle, oily temperature and meets the demands that (speed of a motor vehicle is greater than 85 kilometers/hour, accelerator open degree is less than 1%, the oil temperature is greater than 80 degree) time, central processing module simulates Retarder highest gear bit instruction (highest gear switch closure signals) through switch driving circuit, offer electronic-controlled installation through 301,201.Electronic-controlled installation instructs according to gear, and the work of excitation actuator impels retarder that car load is braked, and vehicle-state changes.
Move back shelves requirements (less than 55 kilometers/hour) when the speed of a motor vehicle is satisfied, central processing module simulates the instruction of Retarder zero span through switch driving circuit, offers electronic-controlled installation, braking releasing, off-test through 301,201.
The speed of a motor vehicle relevant with vehicle-state, throttle feed back to central processing module and are used for storage, and real-time curve shows on human-computer interface module simultaneously.
1. after test is finished, according to dual mode the performance index of certain test are judged.
Mode 1: numerical evaluation with relatively judge
According to operator's demand, call the data of storage, by the data processing method calculation of performance indicators, and with the expectation index relatively judge, pass through man-machine interface module.
To calculate deceleration time and retarded velocity according to time and the speed of a motor vehicle, contrast (as retarded velocity range limit 1.2m/s with the retarded velocity that requires
2, lower limit 0.8m/s
2), if calculated value in scope, judges that performance is qualified.
Mode two: judge between patterned sections
Human-computer interface module is under data display interface, and the control central processing unit calculates, in the same coordinate system, draw time speed of a motor vehicle actual curve with reference to curve.Fig. 3 decelerability is judged synoptic diagram:
If the time point when actual vehicle speed is v1=80 kilometer/hour during the Retarder highest gear is t0, then line of reference 1 (a0=1.2m/s
2) and 2 (a1=0.8m/s
2) starting point be X1:t0, Y1:v1; Line of reference 1 terminal point is X1:ta0=t0+ (20/1.2/3.6), Y1:v2=60; Line of reference 2 terminal points are X1:ta1=t0+ (20/0.8/3.6), Y1:v2.
The contrast actual curve with reference to the relative position of curve, can judge the quality of retarded velocity performance.If actual curve between two line of reference, judges that then retarded velocity meets the requirements.If be in line of reference 1 left side, then retarded velocity is excessive; Line of reference 2 right sides, then retarded velocity is too small.
Proving installation instead of external device, the program by central processing module are carried out and are combined emulation mode with made of hardware circuits which process and realize testing automatically, and concrete steps are as follows:
1. test is prepared.Proving installation is connected by wire harness with electronic-controlled installation, peripheral components, signals of vehicles, car load CAN communication.Fig. 4 electronic-controlled installation test block diagram
2. operator and human-computer interface module are mutual, select test event, and test sequence also arranges parameter.
As test event 1: each grade working current detects.For example retarder is established 4 retainings, and the electric current expectation value of each grade is 100,200,300,400 milliamperes, and error is less than 20 milliamperes.
Test event 2:CAN speed of a motor vehicle function
3. after starting test, the breath of delivering a letter under the human-computer interface module automatically performs successively to CPU (central processing unit).Fig. 5 electronic-controlled installation test flow chart
The detection step of test event 1:
Step 1: circuit switches to the instruction simulation state.
Central processing unit control 101 disconnects 201 closures, 301 closures.After 301, the one tunnel offers electronic-controlled installation through 201 to the digital quantity output signal of central processing unit (be used for instruction simulation) through the switching signal driver element, the one tunnel through the switching signal detecting unit to central processing module for the signal self check.Central processing unit and switching signal driver element replace command device to be connected with electronic-controlled installation, other peripheral components with meet former car state being connected of electronic-controlled installation.Proving installation is monitored synchronously to peripheral components and CAN signal.
Step 2: analog switch 1 to the 4 simulation Retarder gear of central processing module in the switching signal driver element instructs to electronic-controlled installation.
With analog switch 1 closure (simulation 1 retaining), after 5 seconds retention times, switch 1 state keeps, switch 2 closures, and successively with all switch closures, and after each state kept being 5 seconds, all switches disconnected.
When switch 1-switch 4 was closed successively, proving installation detected the actuator electric current in real time.
Step 3: end of test (EOT) draws the test result of project 1.
If the error of each grade average current that collects and expectation electric current judges that then the braking retaining function of electronic-controlled installation is normal in allowed band.Otherwise end of test (EOT) is carried out fault analysis.
Proving installation also can replace electronic-controlled installation that peripheral components is detected and excitation, judges fault by each device data of man-machine interface module.After the human-computer interface module of proving installation was selected the peripheral components test pattern, signal selection module at first connected switching.The block diagram of Fig. 6 system peripherals signal testing.
Digital-to-analogue switch 2101,3101 disconnects, 1101 closures, and peripheral components and electronic-controlled installation disconnect, and are connected with proving installation.In conjunction with different operations, can carry out the detection of system peripherals parts by human-computer interface module.
Proving installation can carry out on-the-spot test to the performance of actuator.Concrete step is:
1. test is prepared.
Proving installation and electronic-controlled installation, peripheral components, signals of vehicles, car load CAN communication connects by wire harness.
2. circuit switches.
After human-computer interface module was selected the actuator test pattern, signal selecting switch at first connected switching.Carry out following switching with reference to Fig. 7 circuit.
According to test request, digital-to-analogue switch 301,303 closures, 302 disconnect, and central processing module and driving are connected with actuator with the switch of detecting unit through closure, and 302 disconnect then signal and the actuator isolation of electronic-controlled installation.
3. start test
For the measurement of retarder proportioning valve, implementation is that central processing unit and driving replace electronic-controlled installation to be connected with proportioning valve with detecting unit, send one group of drive duty cycle signal under the certain hour.Signal is after driving detecting unit, and after the actuate actuators action, pressure and electric current all change, and feeds back to central processing unit in real time and is used for storage and shows.
4. data readback and analysis.
Adopt the method for judging between aforesaid patterned sections to carry out Analysis And Evaluation, under data display interface, in the same coordinate system, draw the time pressure actual curve with reference to curve.If being higher than with reference to pressure, actual pressure curve integral body judges that then actuator performance is normal.Otherwise judge that actuator performance is unusual.
Claims (10)
1. a Retarder electric-control system test and diagnostic device is characterized in that, comprises central processing module, human-computer interface module, interface module, signal selection module and CAN communication module; Described signal selection module connection interface module, CAN communication module and central processing module, described interface module all is connected described central processing module with the CAN communication module, and described central processing module connects described human-computer interface module;
Interface module comprises: analog signal detection unit, switching signal detecting unit, switching signal driver element, car load signal processing unit and driving and detecting unit;
Described analog signal detection unit, the physical quantity signal that sends for detection of sensor;
Described switching signal detecting unit is used for state to each switchgear of system and detects or the Artificial switch state is carried out from detecting;
Described switching signal driver element is used for the Full Vehicle System indicating device is driven;
Described car load signal processing unit is used for original car load signal is converted to the discernible standard signal of central processing module;
Described driving and detecting unit are used for driving the actuator of Full Vehicle System, and detect the working current of actuator;
Described signal selection module comprises many group digital-to-analogue switch elements and many group electronic switch units.
2. a kind of Retarder electric-control system test and diagnostic device according to claim 1 is characterized in that, described signal selection module connects the peripheral components of Full Vehicle System and the electronic-controlled installation of Retarder; The peripheral components of described Full Vehicle System comprises the command device of signals of vehicles, indicating device, CAN bus, the actuator of peripheral components, the command device of peripheral components, the indicating device of peripheral components and the sensor of peripheral components of signals of vehicles.
3. a kind of Retarder electric-control system test and diagnostic device according to claim 2, it is characterized in that the analog signal detection unit of described central processing module connection interface module, switching signal detecting unit, switching signal driver element, car load signal processing unit and driving and detecting unit; Central processing module selects the disconnection of digital-to-analogue switch element corresponding in the module, electronic switch unit with closed by control signal, corresponding device and/or the electronic-controlled installation of Retarder in the peripheral components that connects Full Vehicle System by certain or a plurality of unit in the interface module with the control central processing unit.
4. a kind of Retarder electric-control system test and diagnostic device according to claim 1 is characterized in that, described central processing module adopts the XC166 of Infineon series 16 8-digit microcontrollers.
5. a kind of Retarder electric-control system test and diagnostic device according to claim 1 is characterized in that:
Central processing module is connected with the analog signal detection unit, and digital-to-analogue switch element corresponding in signal selection module is connected with the external sensor simulating signal of electric-control system, realizes the detection of system physical amount; Central processing module detects supply voltage by bleeder circuit with after one tunnel analog signal detection unit is connected; Central processing module detects the current conversion voltage signal by sampling resistor with after one tunnel analog signal detection unit is connected;
Central processing module is connected with the switching signal detecting unit, the digital-to-analogue switch in signal selection module, and realize two kinds of connected modes: 1. the switching signal with the ECU (Electrical Control Unit) device is connected, and realizes the detection to various switches; 2. be connected with the signal of Artificial switch, realize the detection certainly of simulating signal;
Central processing module is connected with the car load signal processing unit, and the digital-to-analogue switch in signal selection module is connected with the associated vehicle signal, realizes the detection to the car load signal;
Central processing module is connected with the switching signal driver element, and the digital-to-analogue switch in signal selection module is connected with indicating device, realizes driving and detection to parts;
The electronic switch contact of the pulse-width signal of central processing module in the output of pulsewidth modulation interface and driving and detecting unit, signal selection module, the testing circuit of electronic switch are connected with actuator, realize actuator driven and detection;
The general digital output interface of CPU (central processing unit) is connected with the control end of digital-to-analogue switch in the signal selection module, realize closure and the disconnection of each digital-to-analogue switch in the signal selection module, i.e. the connecting and disconnecting of analog quantity or switching value signal and switch or analogue detection circuitry; Be connected with the control end of electronic switch in the signal selection module, realize the conducting of make and break contact and end the i.e. connecting and disconnecting of actuator and driving and detecting unit.
6. a kind of Retarder electric-control system test and diagnostic device according to claim 1, it is characterized in that, when carrying out the manual test of vehicle performance, make the first digital-to-analogue switch (101) and second digital-to-analogue switch (201) closure in the digital-to-analogue switch element, the 3rd digital-to-analogue switch (301) disconnects, and the gear signal one tunnel of command device offers electronic-controlled installation through the first digital-to-analogue switch (101), the second digital-to-analogue switch (201); One the tunnel through the first digital-to-analogue switch (101) and switching signal detecting unit to central processing module for detection of; All of electronic-controlled installation and peripheral components are connected and meet former car state; The test and diagnostic device is monitored synchronously to peripheral components and CAN signal.
7. a kind of Retarder electric-control system test and diagnostic device according to claim 1 is characterized in that, when carrying out the automatic test of vehicle performance, signal selection module at first connects switching; According to the measurement circuit requirement, central processing unit is controlled the first digital-to-analogue switch (101) and is disconnected second digital-to-analogue switch (201) closure, the 3rd digital-to-analogue switch (301) closure; The digital quantity output signal of central processing unit through the switching signal driver element behind the 3rd digital-to-analogue switch (301), one the tunnel offers electronic-controlled installation through the second digital-to-analogue switch (201), and one the tunnel is used for the signal self check through the switching signal detecting unit to central processing module; Central processing module and switching signal driver element replace command device to be connected with electronic-controlled installation, other peripheral components with meet former car state being connected of electronic-controlled installation; The test and diagnostic device is monitored synchronously to peripheral components and CAN signal.
8. a kind of Retarder electric-control system test and diagnostic device according to claim 1, it is characterized in that, central processing module is connected with external signal through interface module, signal selection module, by operation and the demonstration of human-computer interface module, realize the working condition of system unit is checked and simulates.
9. a kind of Retarder electric-control system test and diagnostic device according to claim 1, it is characterized in that, central processing module carries out communication through interface module, signal selection module, CAN communication module and Retarder electronic-controlled installation, be used for reading system storage failure sign indicating number or monitor real time data, judge fault.
10. a kind of Retarder electric-control system test and diagnostic device according to claim 1 is characterized in that central processing module is all simulated or the partial simulation external signal is carried out half emulation testing of Retarder electronic-controlled installation.
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