CN101216371A - Engine control module environment durability test all-purpose platform and test method - Google Patents
Engine control module environment durability test all-purpose platform and test method Download PDFInfo
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Abstract
The invention provides a universal platform for environment endurance test of the control module of an engine, comprising an industrial control computer, a signal generating sub-system, a state monitoring sub-system, a simulation load sub-system box, an environment test box, application software, a database management system, etc. The system is constructed on the basis of key techniques such as control technique of electro-jet motor, multilayer CAN bus network communication technique, endurance test criterion and PCM long-term reliability assessment method. Based on dummy instrument technique and an embedded computer system, the invention can provide analog signals of a vehicle sensor and action of an execution mechanism, real-time control environment variables and a large-power DC power supply and on-line monitor operation state of PCM, thus evaluating the endurance of PCM by a reliability evaluation expert system. The platform is compatible to environment endurance tests of PCM of multi-manufactures and multi-types and is the open test system with high upgrading and expanding capacity.
Description
Technical field
(POWER CONTROL MODULE PCM), relates in particular to the environment durability test technology and the device of engine control module to the present invention relates to a kind of engine control module.
Background technology
Automotive engine control module (PCM) is the core component in the vehicle electric field, the signal that sensors such as the throttle opening of its reception engine, crank position, the speed of a motor vehicle provide, after program is calculated, accurately control fuel supply volume, ignition advance angle and idling air mass flow, greatly improve the dynamic property and the fuel economy of automobile, reduced the discharge capacity of tail gas simultaneously again effectively.PCM generally is installed in the engine bin, and working environment is extremely abominable, and its reliability is most important.All newly-designed PCM must could by design verification through environment durability test, and the PCM module of each production batch has only to inspect by random samples by environment durability and just can dispatch from the factory.The eighties in last century, PCM module manufacturing company that several families are well-known in the world such as Bosch (BOSCH), Siemens (SIEMENS), Delphi (DELPHI), Visteon (VISTEON), product at oneself has carried out PCM durability test Study on Technology in succession, and developed relevant device, wherein representative is the test macro of Visteon development, but this kind equipment is still continued to use at present is design system before more than 20 year, can not adapt to the development of automotive electric injection engine technology with rapid changepl. never-ending changes and improvements, though in use, development according to automotive electronic technology has been carried out some upgradings to these equipment, as increase CAN bus communication function etc., but the overall technology platform still falls behind, there are some unsurmountable defectives, as PCM module that can not compatible different vendor, the Automatic Cycle strategy can not be set, can not the situ configuration analog signal types and parameter etc., be badly in need of utilizing virtual instrument technique and embedded computer technology to make up new platform.
Summary of the invention
The present invention proposes a kind of automotive engine control module (PCM) environment durability test all-purpose platform and method of testing, related PCM environment durability test all-purpose platform is control technology, embedded computer technology, virtual instrument technique, simulation test technology and the reliability assessment theory based on electronic fuel injection engine, adopt modular organization and multilayer fieldbus networks communication protocol, according to PCM durability test method and standard, the system that develops with high opening, intelligent and practicality.
The present invention is realized by following scheme:
The PCM durability test all-purpose platform mainly comprises hardware system and software systems two parts composition.
Hardware system as shown in Figure 1, it mainly is made up of 7 parts: industrial control computer (industrial computer) 1, signal generation subsystem 2, fictitious load subsystem 3, load monitoring subsystem 4, program control large power supply 5, environmental experiment case 6, field bus communication subsystem 7.
Industrial control computer 1 is the core of whole test system, is the active platform of realizing the man-machine communication, and it also is the carrier of durability test software simultaneously.With A/D card, D/A card, CAN GPIB communications protocol transition cards such as 485 assign on the industrial computer 1, the application software that adds exploitations such as Visual C++, LabVIEW constitutes virtual instrument platform, realized collecting test analysis with the total digitalization of computing machine, have that software and hardware resources is abundant, cost is low, open system degree height, compatible advantage such as good.
It is the multi-functional open embedded computer system of hardware frame with single-chip microcomputer and programmable logic device (PLD) (CPLD) that signal generation subsystem 2 is one, it can carry out system extension by fieldbus, only need distribute to the different sign of each signal generating module (ID), just can form the signal generation subsystem network of multimode.Signal generation subsystem 2 can receive the configuration order that industrial control computer 1 sends, and produces the various signals that satisfy PCM test necessary requirement, and the kind of signal (as sine, square wave, sawtooth or direct current), frequency, amplitude can be by programmed control.Signal generation subsystem 2 can also produce the sensor signal of random waveform, and the crankshaft-position signal (CPS) as hypodontia comprises 36-1,60-2, types such as 36-2.
Similar with signal generation subsystem 2, fictitious load subsystem 3 also is the open system that can simulate the output load of various PCM modules, its fictitious load mainly is made up of inductance, resistance, relay matrix, it is made up of the multiple load board that is installed in the load box, can replace and expand according to the test needs, form the output load subsystem network of multimode.The fictitious load subsystem receives the configuration order that industrial computer 1 sends by fieldbus, and the configuration relay matrix switches the different loads of the required connection of PCM, finishes the durability test task.
It is the open embedded computer system of hardware frame with single-chip microcomputer and programmable logic device (PLD) (CPLD) that load monitoring subsystem 4 also is one.It can carry out system extension by fieldbus, only need distribute to the different sign of each load monitoring module (ID), just can form the load monitoring subsystem network of multimode.It is installed in the load box together with load board, and is connected with load board by core bus.Monitor fuel injection signal, ignition signal and other load of PCM module at load monitoring subsystem 4 scenes of being responsible for, and by fieldbus the result is shown on the display screen of industrial computer.A load monitoring module can monitor 64 the tunnel simultaneously so that more load signal.
In order to satisfy the test needs under the PCM different power voltage, system has adopted the programmable power supply 5 of high-power high-accuracy, as the 6691A type of Agilent company.Programmable power supply is connected to industrial computer by gpib interface, dynamically controls its output voltage and electric current by industrial computer, satisfies the requirement of PCM environment durability test standard.
Environmental experiment case 6 is connected to industrial computer by the RS485 serial communication interface, is the working environment of special simulated engine PCM.By the Industrial Computer Control sending controling instruction, dynamically change its ambient temperature value and humidity value, can test the duty of PCM under extreme environment.
Field bus communication subsystem 7 provides conversion between communication link and the multi-protocols for whole durability test platform, it is by the variety of protocol transceiver, agreement transponder and packet parsing device are formed, and bus interface such as CAN, K-LIN, GPIB, RS485 can be provided.As open system formula plateform system, the field bus communication subsystem can be formed a plurality of communication subnets neatly, finishes the requirement that a plurality of PCM modules are tested simultaneously.
The The software of test macro large data base management systems such as SQL SERCVER, use the programming of Visual C++ and LabVIEW hybrid language, take into account system development efficient and bottom most software compatibility, good user interface and powerful operation function are provided, its major function comprise PCM data acquisition, PCM test and management, supply voltage control, CAN bus management and communicate by letter, fault-tolerant processing, warning, assist, form, demonstration and functions such as data storing and backup.
The present invention about the engine control module environment durability test method is:
By the working environment of the tested engine control module of environmental experiment case 6 simulations, by high-power programmable power supply 5 simulated automotive accumulator and generators, for tested engine control module provides power supply; Signal generation subsystem 2 is according to the configuration order that industrial control computer 1 sends, and produces to satisfy engine control module and test needed various signal and input to tested engine control module; Fictitious load subsystem 3 receives the configuration order that industrial control computer 1 sends, the output load of simulated engine control module by fieldbus; Read in the observation circuit signal on the load board in the fictitious load subsystem 3 is monitored all load signals that engine control module exports in the durability test process situation of change in real time according to load monitoring subsystem 4; Realize communicating by letter by field bus communication subsystem 7 between industrial control computer 1 and signal generation subsystem 2, fictitious load subsystem 3, load monitoring subsystem 4, high-power programmable power supply 5 and the environmental experiment case 6; Should
Method comprises step:
1) system initialization: initialization field bus communication subsystem 7, signal generation subsystem 2, environmental experiment case 6 and high-power programmable power supply 5, and report an error to abnormal conditions occurring;
2) test event and signal type are set, and the control corresponding parameter is set;
3) to the scheduling of test event: according to selected test event and selected signal type, test event is dispatched, produce the required environment controlled variable of corresponding project, and in test process the message on each monitoring modular in the inquiry state of engine control module and the load monitoring subsystem 4;
4) carry out data processing, storage, inquiry and demonstration, to the engine control module status data that obtains, handle, generate the required form of user, store required data, generate required data file, the data file that generates by inquiry obtains corresponding information, test event scheduling, the data processing of survey engine control module and the display screen that passes through industrial control computer 1 of reporting to the police are shown, obtain the test result of engine control module and the abnormal conditions of system test equipment and test module.
The present invention has the following advantages: carry out modular design, structure is clear, be easy to safeguard, provides greater flexibility and extendability to system, can dispose various functional modules by different needs, is convenient to upgrading; Adopt the hardware and software platform of virtual instrument technique and embedded computer technology measuring system constructing, the system that makes has very large compatibility and dirigibility; Designed one be used to produce various signals, be the embedded computer system of the style of opening of hardware frame with ARM single-chip microcomputer and CPLD, utilize the DDS technology can design AWG (Arbitrary Waveform Generator), satisfy the demand of different PCM modules, effectively improved the dirigibility of system; The load design has reached effectively integrating of hardware resource, has reduced cost of development; This system can test the identical PCM module of polylith simultaneously, has effectively shortened the test process of PCM module, has improved the test confidence level; Long operation test is being passed through by this system before formal the use, its anti-interference, reliability are high; This system can also test the permanance of motorcycle PCM module except can the different types of PCM module of testing automobile.
Description of drawings
Fig. 1 is a hardware system block diagram of the present invention;
Fig. 2 produces schematic diagram for sinusoidal signal;
Fig. 3 produces schematic diagram for the CPS signal;
Fig. 4 is igniting fuel injection signal monitoring principle figure;
Fig. 5 is the testing system software functional block diagram.
Specific embodiments
Below in conjunction with accompanying drawing this test macro is further elaborated:
Industrial control computer (industrial computer) the 1st, the core of whole test system is man-machine communication's a main platform, the Control Software of host computer and testing software operation are wherein.Native system adopts the industrial computer that grinds China, and assigned the communication Protocol Conversion card, mainly signal generation subsystem 2, fictitious load subsystem 3, load monitoring subsystem 4, program control large power supply 5, environmental experiment case 6 are coupled together the composition communication network, realize the transmission and the reception of information by field bus communication subsystem 7.Simultaneously, industrial computer 1 is furnished with conditioning amplifier, A/D card, D/A card, adopt the application software of exploitations such as Visual C++, LabVIEW, constitute virtual instrument platform, realized collecting test analysis, had advantages such as software and hardware resources is abundant, cost is low, the construction cycle is short, compatibility is strong with the total digitalization of computing machine.Because industrial computer is the core of total system, in the test process of system, all have at any time civil power unstable or because of unscheduled event cut off the power supply may.Work with security and stability in order to make the industry control function, it is its power supply that native system adopts the UPS uninterrupted power source, its working stability can utilize the charge inside battery to continue power supply under power-down conditions and give industrial computer, has ensured that effectively the software and hardware system of industrial computer inside normally moves.
But it is the multi-functional open embedded computer system of hardware frame with ARM single-chip microcomputer 21 and editorial logic device (CPLD) 22 that signal generation subsystem 2 is one.The ARM singlechip chip that native system adopts is LPC2294, but editorial logic device (CPLD) is the ISPLsi1048E of LATTICE company.As long as it distributes to the different sign of each signal generating module (ID), its scope is 0-F, just can carry out system extension by fieldbus, realizes the signal generation subsystem network of multimode.Signal generation subsystem can produce the various signals that satisfy PCM test necessary requirement, such as sine, square wave, sawtooth or direct current or the like by the CAN bus interface configuration order that industry control computer 1 sends of knocking off.The frequency of this signal, amplitude can be by programmed control.Simultaneously, signal generation subsystem can also produce the sensor signal of random waveform, and the crankshaft-position signal (CPS) as hypodontia comprises 36-1,60-2, types such as 36-2.This system has and produces that the signal changeability is strong, control is convenient, low cost and other advantages, has embodied the versatility in the PCM durability test all-purpose platform effectively.
Signal generation subsystem design frequency, sine wave signal that amplitude is adjustable.For satisfying the requirement of frequency accuracy, adopted Direct Digital Synthesizer (DDS) 23 to add the production method of filter amplification circuit 24.The DDS chip that adopts in the side circuit is high-precision AD7008DDS.For traditional DDS chip, the built-in D/A converter of AD7008DDS has modulation functions such as amplitude modulation, frequency modulation and phase modulation, can produce the sine wave signal of multiple frequency, multiple amplitude according to the needs of the concrete PCM module of test.The generation principle of sinusoidal signal as shown in Figure 2.When needs produce sinusoidal signal, but ARM single-chip microcomputer 21 sends control command to editorial logic device CPLD 22, CPLD22 produces the control signal of DDS23 in 25 times decoding backs of clock, produce the sine wave signal of corresponding frequencies, after this sinusoidal signal amplifies 24 through filtering, the sinusoidal signal of output respective magnitudes.
Signal generation subsystem 2 also can produce the sensor signal of random waveform, such as producing crankshaft-position signal (CPS) (36-1,36-2,60-1 or the like).Its fundamental frequency is 2400Hz, and output amplitude is difference ± 5V.For adapting to the demand of multiple PCM, design adopts the mode of CPLD and DA to produce.
The CPS signal produces principle as shown in Figure 3.But in above explanation, what erasable programmable read-only memory (EPROM) EPROM33 adopted is the AT28C64 chip for ARM single-chip microcomputer 31 and editorial logic device CPLD32 among the figure, and the TLC7528 chip is adopted in D/A conversion 34.The sine table data that in EPROM33, have one-period, totally 8192 points.When needs produce the CPS signal, ARM single-chip microcomputer 31 controllers are provided with CPLD32, CPLD32 by clock 37 countings, produces the signal of memory read according to the control command of ARM single-chip microcomputer 31, and provide suitable address signal and control signal to EPROM 33, the data of EPROM33 output appropriate address convert current signal in D/A conversion 34, export single-ended CPS simulating signal, then after filtration behind wave circuit 35 and the single-ended transfer difference treatment circuit 36, output CPS differential signal.In the circuit of reality is realized, control to the CPS signal can be sent control command setting by the CAN bus to ARM single-chip microcomputer 31 by industrial computer 1, even therefore ARM single-chip microcomputer 31 resets in operational process, circuit still can be exported correct CPS signal, to guarantee normally carrying out of test period.
Similar to signal generation subsystem 2, fictitious load subsystem 3 is the open systems that can simulate the output load of various PCM modules, and its fictitious load mainly is made up of inductance, resistance and relay matrix.In order to test the reliability of PCM hardware platform to greatest extent, the PCM hardware platform is in maximum electrical source consumption operating mode and worse electromagnetism, the thermal environment, native system has adopted powerful inductance and resistance.This test macro has been analyzed the concrete condition of load and engine loading on the car of PCM module, has designed the fictitious load plate that polylith has the opening of public usability and special usability, and has been installed in the load box together with load monitoring subsystem 4.Simultaneously, in order to satisfy the test needs of different PCM modules, it can carry out the expansion and the replacement of load, forms the output load subsystem network of multimode.Fictitious load subsystem 3 receives the configuration order that industrial computer 1 sends by fieldbus, and the configuration relay matrix switches the different loads of the required connection of PCM, finishes the durability test task.Adopt this design to provide bigger upgrading space to system, the user can connect according to the different load of different requirement configurations, has improved generality of hardware and effective rate of utilization.
In fictitious load subsystem 3, each load board power supply and earth signal are introduced by backboard.Consideration is to the protection of load, and this test macro has increased by a slow fusing type fuse between load and power supply VPWR, reduces the replacing number of times of load, has also reduced hardware cost.Simultaneously, owing to have inductive load in the load, the saltus step moment at electric current, can produce reverse high voltage transient, brought probabilistic damage to system, influenced measurement stability simultaneously again.In order to resist this high voltage transient, inductance end in load has designed transient voltage inhibition diode (TVS), when producing high back voltage, it can be with the speed of 10-12 second-time, the high impedance of its two interpolar is become Low ESR, absorb the surge power up to thousands of watts, the voltage clamp that makes two interpolars is in a predetermined value, make system avoid the infringement that high pressure brings effectively, improved measuring stability.Output loads such as the main simulation points fire coil of this fictitious load subsystem, oil spout, Valve EGR, exhaust gas recirculation, and adopt the photoelectricity isolation method to monitor above-mentioned PCM output signal.
For the signal level of PCM output be converted to that load monitoring subsystem 4 can receive+the 5VTTL digital signal, consider that power supply ground PWRGND disturbs than digitally the GND existence is more, for guaranteeing the reliability of monitor signal, adopted photoelectric isolation technology in the design, it is mainly realized by photoelectrical coupler.It is formed by a light emitting diode and a photosensitive tube encapsulation, and the PCM signal connects the light-emitting diodes pipe port of photoelectrical coupler, and monitor signal is connected to the photosensitive tube port of photoelectrical coupler by observation circuit.When PCM signal output signal level, by light emitting diode signal is passed to photosensitive tube, convert electric signal to, and export corresponding level by observation circuit, i.e. the logic level of monitor signal output is identical with the PCM signal.
But load monitoring subsystem 4 be also one be the open embedded computer system of main hardware framework based on ARM single-chip microcomputer and editorial logic device (CPLD), it is installed in the load box together with the load board in the simulation load subsystem 3, and is connected with load board by core bus.It can carry out system extension by fieldbus, only need distribute to the different sign of each load monitoring module (ID), just can form the load monitoring subsystem network of multimode.The major function of this subsystem is exactly by read in the situation of change of all load signals that the observation circuit signal monitoring PCM module on the load board is exported in the fictitious load subsystem 3 in real time in the durability test process, the period of change that comprises signal, the sequential of part signal of interest output etc., and, upload to industrial computer 1 by fieldbus with monitoring result.This test macro is a monitoring periods with 4-6 second, and promptly load monitoring subsystem 4 will upgrade one time Monitoring Data at 4-6 in second.
For the igniting and the fuel injection signal of PCM output, mainly monitor their cycle and sequential.Its monitoring principle figure as shown in Figure 4.For the monitoring of ignition signal, mainly be its synchronous with CPS signal (crankshaft-position signal) of monitoring, and the sequential relationship between two or four ignition signals.But it mainly relies on editorial logic device CPLD52 and ARM single-chip microcomputer 51 controllers to finish.After CPLD52 searches out the synchronous starting point of ignition signal and CPS,,, each ignition signal is counted by data-driven 53 according to the PIP_IN signal of input.After a light-off period is finished, produce a look-at-me to ARM single-chip microcomputer 51 at next light-off period.This look-at-me triggers ARM single-chip microcomputer 51 and enters interrupt handling routine, and in this interrupt routine, ARM single-chip microcomputer 51 reads in the count value to each ignition signal, judges the sequential and the cycle of ignition signal, and the whether normal sign of ignition signal is set.For the monitoring of fuel injection signal, mainly be its synchronous with the CPS signal of monitoring, and the sequential relationship between them.It mainly relies on CPLD52 to finish real-time monitoring.When the negative edge of any one signal in four fuel injection signals in the PIP_IN signal arrives, CPLD52 can detect the state of other three fuel injection signals, if the state of other three fuel injection signals is normal, promptly provides fuel injection signal and normally indicate, otherwise provide the fuel injection signal abnormality mark.
For the slow speed signal of PCM module medium frequency variation lower (such as 2Hz), the cycle of mainly monitoring them changes.The output signal of PCM is a lot, the monitor signal of these signal correspondences all can not be introduced directly on the load monitoring plate, therefore can only adopt the bus of RS232 to read mode collection, the ARM singlechip controller is realized monitoring to load signal by regularly reading monitor signal on each load board.
High-power programmable power supply 5 main simulated automotive accumulator and generators are for tested PCM provides power supply.In order to satisfy the test needs under the PCM different power voltage, system has adopted the programmable power supply of the 6691A type high-power high-accuracy of Agilent company, and has field bus communication interfaces such as GPIB, RS-485.Native system mainly is connected to industrial computer by gpib interface, dynamically controls its output voltage and electric current by industrial computer, its precision height, and working stability has satisfied the requirement of PCM environment durability test standard.
Environmental experiment case 6 provides simulated engine PCM module working environment, can hold a plurality of PCM modules and test.It has GBIP and RS485 field-bus interface, and native system uses RS485 interface and industrial computer 1 to carry out message exchange.In test, by what industrial computer 1 sent instruction is set, regulate humidity and temperature in the environment experimental box 7, the operational limit environment of simulation PCM module makes test result meet the practical working situation of PCM more.
Field bus communication subsystem 7 provides conversion between communication link and the multi-protocols for whole durability test platform, it is by the variety of protocol transceiver, agreement transponder and packet parsing device are formed, and bus interface such as CAN, K-LIN, GPIB, RS485 can be provided.As open system formula plateform system, the field bus communication subsystem can be formed a plurality of communication subnets neatly, finishes the requirement that a plurality of PCM modules are tested simultaneously.Because the signal generating module in the signal generation subsystem 2 has two CAN interfaces, can form two CAN subnets, is respectively CAN subnet 1 and CAN subnet 2, and can be between two subnets transmission information.For each PCM, signal generating module and load monitoring module and PCM form a CAN subnet 1.Industrial computer 1 links together each subnet by communication subnet 0, and simultaneously the information that receives is presented on the display screen of industrial computer 1.
For signal generation subsystem 2, the main CAN bus of passing through is communicated by letter with industrial computer 1, realization is to CPS type, startup CPS, the generation that starts sinusoidal signal and the setting of switching value input relay of each signal generating module in the signal generation subsystem 2, and be terminal with the signal generating module, be provided with and control PCM module, read the failure code of PCM module.When industrial computer 1 sends the CAN message to signal generation subsystem 2, during signalization generation module, the sign of CAN message (ID) is (0X80+Card_ID), Card_ID is the sign of signal generating module, the data that send are 8 bytes, are provided with as the CPS type respectively, start CPS, start the generation of sinusoidal signal and switching value input relay etc. is set.When returning, host computer receives ID and is the CAN message of (0x90+Card_ID), and all the other bytes are identical during with transmission.When the control command that PCM is set with when reading the failure code of PCM module, at first sending ID by the CAN bus to signal generation subsystem is the message of (0x10+Card_ID), according to Card_ID, after its corresponding signal generating module receives this instruction, do not change the data in the CAN message, send to the PCM module by CAN bus or KILNE bus after only ID being changed to 0x10.In like manner, after signal generating module receives that from CAN bus or KILNE ID is the CAN message of 0x20, do not change data, only change ID into (0x20+Card_ID), send to industrial computer 1 by the CAN bus then.
For load monitoring subsystem 4, mainly be message to be set and to read load monitoring information by the CAN bus.In the time will message being set, it is the CAN message of 0x60+BOARD_ID that industrial computer 1 sends sign (ID) by the CAN bus to the load monitoring subsystem, wherein BOARD_ID is the sign that is provided with on the load monitoring module, the data that send are 8 bytes, in fact only define 2 bytes, be respectively the order of sending (INDEX) of industrial computer and the data that are provided with.Wherein INDEX is 0X01, and then expression is that relay matrix is provided with.After the load monitoring module receives instruction, will return a CAN message to industrial computer 1 after complete.The sign of message (ID) is 0x70+BOARD_ID, and its 8 data bytes are identical when sending.When industrial computer 1 reads load monitoring information, send sign (ID) to load monitoring subsystem 4 and be the message of 0x40+BOARD_ID, wherein BOARD_ID is with above-mentioned consistent.The data segment of message is 8 bytes, has in fact only defined 1 byte, is packet sequence number-INDEX that industrial computer 1 requirement is returned, and it represents different types of PCM.Load monitoring subsystem 4 is combined into the CAN message with current Monitoring Data and sends to industrial computer 1 after receiving the inquiry CAN message of computing machine, and the ID that returns the CAN message is 0x50+BOARD_ID.The data segment of message is 8 bytes, and first byte is packet sequence number-INDEX that the host computer requirement is returned, and it defines with above-mentioned consistent.Other seven bytes are Monitoring Data, have in fact only used preceding 5 bytes, have kept 2 bytes, for later system upgrade provides favourable space.
Fictitious load subsystem 3 mainly is to link to each other with the load monitoring subsystem by the CAN bus, give each fictitious load module with the relay matrix information transmission, finish the switch operating of load, and transmit a load monitoring module implementation monitoring by the TTL monitor signal of observation circuit general+5V.6 in environmental experiment case mainly is connected with industrial computer 1 by RS485, accepts it order is set, and regulates the environment temperature and humidity.
It is framework with large data base management systems such as SQL SERCVER that the software design of test macro is one, adopt the programming of visual c++ and LabVIEW hybrid language, take into account the software testing system of the style of opening of system development efficient and bottom most software compatibility, it provides good user interface and powerful operation function, it is divided into two classes with the user simultaneously: operator and keeper, and give different authorities.The operator only relates to and selects test event, starts test, control and measuring, output test report, and the supvr also has the management and the setting of system except the authority that has the operator, basic test event authority is set etc.
The functional block diagram of system test software is as shown in Figure 5:
1 is system initialization, after entering test macro, the first step is exactly the initialization link of carrying out system, it mainly carries out initialization to CAN bus, signal generation subsystem, environmental experiment case, high-power programmable power supply, other utility appliance etc., and report an error to abnormal conditions occurring, for necessary preliminary work is done in the operation of monitoring system.2 is the test event combined strategy, and it mainly finishes two tasks: test event be provided with 21 and signal type be provided with 22.Being provided with of test event 21 mainly is needs according to the user, selects the test event of part, and the control corresponding parameter is set.Being provided with of signal type 22 mainly is to producing in the signal generation subsystem and the monitored signal type is carried out the setting of controlled variable.3 is the scheduling of test event, it is according to the selected test event of Test Strategy, selected signal type and the test event of setting, start and stop control is carried out in test, test event is dispatched, it mainly finishes the concrete enforcement 31 of test event and the tracking 32 of testing apparatus state.The concrete enforcement 31 of test event is according to test event controlled variable file, produces the required environment controlled variable of corresponding project, and in test process the message on each monitoring modular in the inquiry state of PCM and the load monitoring subsystem.It relates to the content of following five aspects, is respectively the parsing 315 of control 313, CAN packet sending and receiving 314 and message of control 312, the testing apparatus of control 311, the environmental experiment case of supply voltage.Wherein the control 311 of supply voltage mainly is that the Agilent power-supply device is carried out parameter control.It sends control command by industrial computer, and controlled variable is set, and controls the magnitude of voltage of above-mentioned power-supply device.The control 312 of environmental experiment case is the demand according to test event, sends control command by industrial computer, and controlled variable is set, the temperature and humidity of the experimental box that controls environment.The control 313 of testing apparatus mainly is the control to PCM module, load monitoring subsystem.When the controlled variable of PCM module will be set, at first say the word to signal generation subsystem by industrial computer, the sign (ID) according to its transmission is forwarded to the PCM module with order then.During each load detecting module on the load monitoring subsystem will be set, by industrial computer control command is sent to the load monitoring module, monitoring modular is finished the setting of self according to controlled variable.The transmitting-receiving 314 of CAN message mainly is that the information that the load monitoring subsystem of system and PCM module etc. are carried out is sent and receives.By the CAN fieldbus information is sent to the various piece of system by industrial computer, and important information such as the PCM status information that obtains is passed to industrial computer by the CAN bus.The parsing 315 of message is according to the CAN message protocol of PCM and load monitoring plate CAN message protocol, resolves the CAN message and generates the PCM status data.Testing apparatus status tracking 32 is in test process, and the testing apparatus of system is carried out state tracking constantly, reports to the police when abnormal conditions occurring at once.4 is processing, storage and the inquiry of data, and it mainly is to resolve the resulting PCM status data of CAN message to obtaining, and keeps nearest correct data, all data of misregistration, and generate the required form of user, and store required data, generate required data file.When PCM status data information measured before the needs, can obtain corresponding information by the data file that inquiry generates.5 is the demonstration of information, it mainly is with the test event of survey PCM module scheduling 3, data processing 4 and reports to the police and be illustrated in intuitively in face of the user by the industrial computer display screen, by result's demonstration, the user can know the test result of PCM and the abnormal conditions of system test equipment and test module easily.
The advantage of native system is as follows:
1, native system is according to automotive engine control theory, reliability analysis technology, and in conjunction with experiment test, foundation has durable The property testing standard.
2, carry out modularized design, structure is clear, be easy to safeguard, provides greater flexibility and autgmentability to system, can Dispose various functional modules by different needs, be convenient to upgrading.
3, native system adopts the hardware and software platform of virtual instrument technique and embedded computer technology measuring system constructing, so that be System has very large compatibility and flexibility.
4, designed one for generation of various signals, embedding take ARM single-chip microcomputer and CPLD as the style of opening of hardware frame The formula computer system utilizes the DDS technology can design AWG, satisfies the demand of different PCM modules, effectively carries The high flexibility of system.
5, analysis-by-synthesis public character and the particularity of PCM load, set up PCM fictitious load subsystem, designed two kinds The load board of type: common load plate and specific loads plate. Relay matrix switches under industrial computer control according to test request Different loads connects, and finishes concrete test assignment. This load design has reached effectively integrating of hardware resource, reduces Development cost.
6, having designed one is that the open embedded computer system of hardware frame is used for load based on ARM and CPLD Monitoring has proposed the judging phase order between CPS signal and igniting, the oil spout control and has realized circuit.
7, according to the main flow communication protocols of Hyundai Motor electronics, this system has gone out one take the CAN bus as main communication network Network is realized the information interchange of industrial computer and system's modules. Simultaneously, system is again compatible such as K-LINE, LIN, and GPIB, The bus protocols such as RS-485 have really been realized an open communications platform.
8, by the demand to the durability test software systems, designed an open computer management system framework, and Carry out the software module division according to SE principle and design theory, determine the transmission mechanism of inside story. Simultaneously, according to The difference of user identity, fulfillment rights is divided policy, has effectively increased the security of system's operation.
9, this system can test the identical PCM module of polylith simultaneously, has effectively shortened the test process of PCM module, has improved The test confidence level.
10, long operation test is being passed through by this system before formal the use, and its anti-interference, reliability are high.
11, because operation principle and the automobile of motorcycle PCM module is substantially similar, this system is except can the testing automobile difference Beyond the PCM module of kind, can also test the durability of motorcycle PCM module.
Claims (10)
1. engine control module environment durability test all-purpose platform device, comprise industrial control computer (1), signal generation subsystem (2), fictitious load subsystem (3), load monitoring subsystem (4), program control large power supply (5), environmental experiment case (6) and on-the-spot total communication subsystem (7), in industrial control computer (1), assign the communication Protocol Conversion card, and by on-the-spot total communication subsystem (7) realization industrial control computer (1) and signal generation subsystem (2), fictitious load subsystem (3), load monitoring subsystem (4), conversion between high-power programmable power supply (5) and the environmental experiment case (6) between communication and the multi-protocols is characterized by:
Signal generation subsystem (2) receives the configuration order that industrial control computer (1) sends by on-the-spot total communication subsystem (7), produces the desired various signals of engine control module environment durability test;
Fictitious load subsystem (3) receives the configuration order that industrial control computer (1) sends, the output load of simulated engine control module by on-the-spot total communication subsystem (7);
Load monitoring subsystem (4) is realized the monitoring to engine control module, and monitoring result is uploaded to industrial control computer (1) by on-the-spot total communication subsystem (7);
High-power programmable power supply (5) simulated automotive accumulator and generator are for tested engine control module provides power supply;
The working environment of the tested engine control module of environmental experiment case (6) simulation can hold a plurality of engine control module and test.
2. engine control module environment durability test all-purpose platform device according to claim 1, it is characterized by: it is the multi-functional open embedded computer system of hardware frame with single-chip microcomputer and programmable logic device (PLD) that described signal generation subsystem (2) is one, be made up of a plurality of signal generating module, this signal generation subsystem (2) can carry out system extension by fieldbus.
3. engine control module environment durability test all-purpose platform device according to claim 2, it is characterized by: described signal generation subsystem (2) receives the configuration order that industrial control computer (1) sends, produce the desired various signals of engine control module environment durability test, described signal comprises: sine, square wave, sawtooth and direct current signal, and the sensor signal of random waveform.
4. engine control module environment durability test all-purpose platform device according to claim 1, it is characterized by: described fictitious load subsystem (3) comprises inductance, resistance and relay matrix, test needs according to different engine control module, can carry out the expansion and the replacement of load, described fictitious load subsystem (3) receives the configuration order that industrial control computer (1) sends, and disposes different loads and connects.
5. engine control module environment durability test all-purpose platform device according to claim 4, it is characterized by: between load in described fictitious load subsystem (3) and the power supply slow fusing type fuse is set, and between the inductance end of load and ground, be connected transient voltage and suppress diode, be used for the transient suppression high voltage.
6. engine control module environment durability test all-purpose platform device according to claim 1, it is characterized by: load monitoring subsystem (4) but be an open embedded computer system based on single-chip microcomputer and editorial logic device, can carry out system extension by fieldbus, the load monitoring subsystem network of forming multimode, load monitoring subsystem (4) read in the situation of change of all load signals that the observation circuit signal on the load board in the fictitious load subsystem (3) exports with the monitoring engine control module in real time in the durability test process.
7. engine control module environment durability test all-purpose platform device according to claim 1, it is characterized by: described high-power programmable power supply (5) adopts the programmable power supply of the 6691A type high-power high-accuracy of Agilent company, dynamically controls its output voltage and electric current by industrial computer.
8. engine control module environment durability test all-purpose platform device according to claim 1, it is characterized by: described environmental experiment case (6) carries out message exchange by RS485 interface and industrial control computer (1), in test, by what industrial control computer (1) sent instruction is set, regulate humidity and temperature in the environment experimental box (7), the operational limit environment of simulated engine control module.
9. engine control module environment durability test all-purpose platform device according to claim 1, described field bus communication subsystem (7) is characterized by for whole durability test stage apparatus provides conversion between communication link and the multi-protocols: described signal generation subsystem (2) is communicated by letter with industrial control computer (1) by the CAN bus; Described fictitious load subsystem (3) links to each other with load monitoring subsystem (4) and industrial control computer (1) by the CAN bus, finishes the configuration and the switching of load; Described load monitoring subsystem (4) is connected with fictitious load subsystem (3) and industrial control computer (1) by the CAN bus, reads the load monitoring data and uploads to industrial control computer (1); Described high-power programmable power supply (5) is connected to industrial control computer (1) by gpib interface, dynamically controls its output voltage and electric current by industrial control computer (1); Environmental experiment case (6) carries out message exchange by RS485 interface and industrial control computer (1).
10. engine control module environment durability test method, this method of testing is by the working environment of the tested engine control module of environmental experiment case (6) simulation, by high-power programmable power supply (5) simulated automotive accumulator and generator, for tested engine control module provides power supply; Signal generation subsystem (2) is according to the configuration order that industrial control computer (1) sends, and produces to satisfy engine control module and test needed various signal and input to tested engine control module; Fictitious load subsystem (3) receives the configuration order that industrial control computer (1) sends, the output load of simulated engine control module by fieldbus; Read in the observation circuit signal on the load board in the fictitious load subsystem (3) is monitored all load signals that engine control module exports in the durability test process situation of change in real time according to load monitoring subsystem (4); Pass through field bus communication subsystem (7) between industrial control computer (1) and signal generation subsystem (2), fictitious load subsystem (3), load monitoring subsystem (4), high-power programmable power supply (5) and the environmental experiment case (6)
Realize communication; The method comprising the steps of:
1) system initialization: initialization field bus communication subsystem (7), signal generation subsystem (2), environmental experiment case (6), high-power programmable power supply (5), and report an error to abnormal conditions occurring;
2) test event and signal type are set, and the control corresponding parameter is set;
3) to the scheduling of test event: according to selected test event and selected signal type, test event is dispatched, produce the required environment controlled variable of corresponding project, and in test process the message on each monitoring modular in the inquiry state of engine control module and the load monitoring subsystem (4);
4) carry out data processing, storage, inquiry and demonstration, to the engine control module status data that obtains, handle, generate the required form of user, store required data, generate required data file, the data file that generates by inquiry obtains corresponding information, test event scheduling, the data processing of survey engine control module and the display screen that passes through industrial control computer (1) of reporting to the police are shown, obtain the test result of engine control module and the abnormal conditions of system test equipment and test module.
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