CN101799363A - Vehicle engine electronic control unit testing system and variable resistor combination adjusting method thereof - Google Patents
Vehicle engine electronic control unit testing system and variable resistor combination adjusting method thereof Download PDFInfo
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Abstract
The invention relates to a vehicle engine electronic control unit testing system and a variable resistor combination adjusting method thereof. A signal processing module detects sensor simulation signals for simulating the operation of a vehicle and an engine, which are generated by a control panel and a frequency signal generator module, through an ECU (Electronic Control Unit) input signal detection module; actuator control signals of an engine management system, which are output by an engine control unit, are detected through an ECU output signal detection module; the testing state, condition parameters and tested engine control unit performance data are displayed on a display panel through a display control module; and the testing state, the condition parameters and the tested engine control unit performance data are transmitted to a computer for development and analysis through a testing system communication interface module. In the invention, the sensor simulation signals of the engine management system are generated in real time so as to stimulate the engine control unit, and meanwhile, the simulation signals and the actuator control signals output by the ECU are detected, and data are transmitted, analyzed, processed, displayed and communicated.
Description
Technical field
The present invention relates to a kind of vehicular engine, be specifically related to a kind of vehicle engine electronic control unit testing system and variable resistor combination adjusting method thereof that is applicable to the control performance of test under simulated environment, check engine control module.
Background technology
The vehicular engine electronic control technology is the integrated technology that integrates computer technology, electronic technology, measuring technology, accurate manufacturing technology, engine technology, it is a core with engine oil spout control, IGNITION CONTROL, it is the Basic Ways that engine reduces discharging, energy efficient, raising power, being the best means that promotes engine operation power performance and security performance, also is vehicle electric technology technology bottom, core.Along with the development of vehicle industry, the vehicular engine electronic control technology is in not only development.Especially domestic in China, the exploitation of vehicular engine control management system, test have become an important content of power train in vehicle application technical research.During exploitation power train in vehicle application control management system, test is must obligato link.Test process is divided into real vehicle test and emulation testing according to the residing environment of engine electronic control unit.
The real vehicle test is that sensor, the actuator of ECU (Electrical Control Unit) with real engine and vehicle is connected, and starts the control ability test that vehicle carries out ECU (Electrical Control Unit).Real vehicle test owing to the cost height, have a big risk, reasons such as process is loaded down with trivial details, operation inconvenience, one just carries out in the engine management system exploitation or the final stage of demarcating, and then often uses emulation testing (being the test under the simulation test environment) in the performance history.
Emulation testing has the emulation testing based on special real-time simulator, and this emulation testing needs to design, develop or purchase complexity, the motor vehicle of costliness and the emulator of engine; Emulation testing also has based on signal generator and oscillographic simple test mode, utilize signal generator to generate excitation source signal, the excitation engine electronic control unit, come the output signal of detection of engine control system again by oscillograph, this class testing is finished by general automatically controlled product development equipment such as signal generator, oscillograph or logic analysers, equipment is simple, but test inconvenience.
Summary of the invention
Technical matters to be solved by this invention is, provide a kind of by to the variable resistor knob arranged on its control panel and the adjusting and the control of keyswitch, simulation generates the sensor Simulation signal of engine and vehicle operating, excitation control unit of engine ECU, then, simultaneously input, the output signal of detection of engine control module (ECU) reach the vehicle engine electronic control unit testing system and the variable resistor combination adjusting method thereof of test engine control module ECU purpose.
The technical solution adopted in the present invention is: a kind of vehicle engine electronic control unit testing system and variable resistor combination adjusting method thereof, and vehicle engine electronic control unit testing system comprises: control panel; The frequency of signal generator module; ECU input signal detection module; Power management module; ECU output signal detection module; Signal processing module; Display control module; Display panel and test macro communication interface module, wherein,
Described signal processing module is made of AD conversion unit with analog-digital conversion function and the micro-control unit that has the input capture function;
Described signal processing module detects the simulating vehicle of control panel and the generation of frequency of signal generator module and the sensor Simulation signal of engine operation by ECU input signal detection module;
Described signal processing module, by ECU output signal detection module, the actuator control signal of the engine management system of detection of engine control module output;
Described signal processing module by display control module, shows test mode, conditional parameter and the control unit of engine performance data of testing on display panel;
Described signal processing module by the test macro communication interface module, sends test mode, conditional parameter and the control unit of engine performance data of testing to the development analysis computing machine;
Described power management module provides various reference power supplies for test macro and control unit of engine.
Described control panel includes 15 groups of variable resistor knobs and 5 groups of keyswitches.Wherein, there are 10 groups to be used for the simulated engine intake air temperature respectively in described 15 groups of variable resistor knobs, engine coolant temperature, oil temperature, the on-board air conditioner temperature, throttle opening, air-distributor pressure, the inlet air flow, battery tension, first to the tenth variable resistor knob of engine exhaust system upstream oxygen sensor value and engine exhaust system catalyst monitoring sensor value has 5 groups to be used to control engine crankshaft corner position and rotating speed, piston phase place identification camshaft speed, the speed of a motor vehicle, the 11 to the 15 variable resistor knob that the emulation of 4 kinds of frequency signals of pinking generates; Described 5 groups of keyswitches are first to the 5th keyswitches that are respectively applied for analog machine motor-car starting switch signal, firing key signal, air-conditioning request signal, power-assisted steering signal, neutral switch signal.
Described frequency of signal generator module includes AD conversion unit and the micro-control unit with analog-digital conversion function, the signal that described AD conversion unit will be generated by the variable resistor knob that 5 groups of emulation that is used to control engine crankshaft corner position and rotating speed, piston phase place identification camshaft speed, the speed of a motor vehicle, 4 kinds of frequency signals of pinking in the control panel generates carries out digital-to-analog conversion, through micro-control unit generate represent engine crankshaft corner position and rotating speed, piston phase place identification camshaft speed, the speed of a motor vehicle square-wave signal to control unit of engine.
Described ECU input signal detection module includes filtering circuit and the bleeder circuit that links to each other with this filtering circuit, constitutes control panel and frequency of signal generator to the interface channel between the test macro signal processing module; Described ECU input signal detection module arrangement has multimeter, oscillographic probe measuring point.
Described ECU output signal detection module includes six groups of input ends and links to each other with control unit of engine, the fuel injector control signal testing circuit that output terminal links to each other with signal processing module; Three groups of input ends link to each other with control unit of engine, the ignition coil control signal testing circuit that output terminal links to each other with signal processing module; Three groups of input ends link to each other with control unit of engine, the relay control signal testing circuit that output terminal links to each other with signal processing module; Three groups of input ends link to each other with control unit of engine, the solenoid valve control circuit that output terminal links to each other with signal processing module; Described ECU output signal detection module has constituted control unit of engine to the interface channel between the test macro signal processing module; Described ECU output signal detection module is furnished with multimeter, oscillographic probe measuring point.
Variable resistor combination adjusting method in the vehicle engine electronic control unit testing system, regulate the engine crankshaft rotating speed by the 11 variable resistor knob in the control panel, regulate the square wave number that the engine crankshaft revolution generates by the 12 variable resistor knob again, regulate the difference of decision engine crankshaft and camshaft piston phase place simultaneously by the 12 variable resistor knob; Regulate the ratio of gear of the engine crankshaft of vehicle by the 13 variable resistor knob, thereby the engine crankshaft revolution speed calculating of regulating according to the 11 variable resistor knob obtains the speed of a motor vehicle to axletree; Regulate by the combination of the 14 and the 15 variable resistor knob in the control panel, and then the AD conversion unit of process frequency of signal generator is carried out digital-to-analog conversion, micro-control unit by frequency of signal generator generates the square-wave signal of representing combustion knock at last, described the 14 variable resistor knob is regulated the frequency of the square-wave signal of combustion knock, and described the 15 variable resistor knob is regulated the amplitude of the square-wave signal of combustion knock.
Vehicle engine electronic control unit testing system of the present invention and variable resistor combination adjusting method thereof, sensor Simulation signal by real-time generation engine management system, the excitation control unit of engine, then, detect the actuator control signal of this simulate signal and ECU output simultaneously, go forward side by side transmission, analysis, processing, demonstration, the communication of line data reach the purpose of real-time testing ECU.The engine electronic control unit testing system test ECU that utilization the present invention relates to, can finish the test job under the ECU simulated environment, do not need again to involve great expense, the real-time simulator of system complex, and, the engine electronic control unit testing system that the present invention relates to, its test process, clear route, easy to operate, reduce the technology thresholding of ECU emulation testing, thereby helped carrying out of ECU development and popularizing of engine management system technology.
Description of drawings
Fig. 1 is control unit of engine of the present invention (ECU) test macro Organization Chart;
Fig. 2 is the control panel layout;
Fig. 3 is one of control panel circuit structure diagram;
Fig. 4 is two of a control panel circuit structure diagram;
Fig. 5 is three of a control panel circuit structure diagram;
Fig. 6 is four of a control panel circuit structure diagram;
Fig. 7 is the frequency of signal generator circuit structure diagram;
Fig. 8 is an ECU input signal detection modular circuit structural drawing;
Fig. 9 is one of ECU output signal detection module circuit structure diagram;
Figure 10 is two of an ECU output signal detection module circuit structure diagram;
Figure 11 is three of an ECU output signal detection module circuit structure diagram;
Figure 12 is four of an ECU output signal detection module circuit structure diagram;
Figure 13 is a test macro signal processing module circuit structure diagram;
Figure 14 is a test macro display control module circuit structure diagram;
Figure 15 is a test macro communication interface module circuit structure diagram.
Wherein
1: control panel 2: the frequency of signal generator module
3:ECU input signal detection module 4: power management module
5:ECU output signal detection module 6: signal processing module
7: display control module 8: display panel
9: test macro communication interface module 10: computing machine
11:ECU communication interface module 12: control unit of engine
Embodiment
Below in conjunction with embodiment and accompanying drawing vehicle engine electronic control unit testing system of the present invention and variable resistor combination adjusting method thereof are made a detailed description.
As shown in Figure 1, vehicle engine electronic control unit testing system of the present invention comprises: control panel 1; Frequency of signal generator module 2; ECU input signal detection module 3; Power management module 4; ECU output signal detection module 5; Signal processing module 6; Display control module 7; Display panel 8 and test macro communication interface module 9.Wherein, described signal processing module 6 detects the simulating vehicle of control panel 1 and 2 generations of frequency of signal generator module and the sensor Simulation signal of engine operation by ECU input signal detection module 3; Described signal processing module 6, by ECU output signal detection module 5, the actuator control signal of the engine management system of detection of engine control module 12 outputs; Described signal processing module 6 by display control module 7, shows test mode, conditional parameter and control unit of engine 12 performance datas of testing on display panel 8; Described signal processing module 6, by test macro communication interface module 9, send test mode, conditional parameter and control unit of engine 12 performance datas of testing to development analysis with computing machine 10, development analysis with computing machine 10 be used for analyzing, the demonstration test data; The signal output part of described detected control unit of engine 12 carries out communication by ECU communication interface module 11 and development and testing computing machine 10.Described power management module 4 provides various reference power supplies for test macro and control unit of engine 12.
Vehicle engine electronic control unit testing system of the present invention, by its control panel 1, frequency of signal generator module 2 generates the simulate signal of various sensors, excitation engine electric-controlled unit 12, after engine electric-controlled unit 12 collects the sensor Simulation signal, processing through corresponding control strategies, the actuator control signal of output engine management system, then, the test macro that the present invention relates to is by its ECU input signal detection module 3, ECU output signal detection module 5, signal processing module 6 detects each signal of input ECU and each signal of ECU output, as calculated, passing to display control module 7 after the analysis shows for display panel 8 then; Simultaneously, send development and testing computing machine 10 to by test macro communication interface module 9.Power management module 4 for each module and the engine electric-controlled unit 12 to be tested of the engine electronic control unit testing system that the present invention relates to provide+1V ,+3.5V ,+5V ,+12V ,+reference power supplies such as 24V.
As shown in Figure 2, described control panel 1 includes 15 groups of variable resistor knobs and 5 groups of keyswitches, wherein, there are 10 groups to be used for the simulated engine intake air temperature respectively in described 15 groups of variable resistor knobs, engine coolant temperature, oil temperature, the on-board air conditioner temperature, throttle opening, air-distributor pressure, the inlet air flow, battery tension, first to the tenth variable resistor knob Tair of engine exhaust system upstream oxygen sensor value and engine exhaust system catalyst monitoring sensor value, Tcw, Toil, Tac, TPS, MAP, AFM, Vbat, OS1, OS2 has 5 groups to be used to control engine crankshaft corner position and rotating speed, piston phase place identification camshaft speed, the speed of a motor vehicle, the 11 to the 15 variable resistor knob CAS that the emulation of 4 kinds of frequencies of pinking (square wave) signal generates, PIS, VSS, KSa, KSf; Described 5 groups of keyswitches are to be respectively applied for analog machine motor-car starting switch signal, firing key signal, air-conditioning request signal, power-assisted steering signal, first to the 5th keyswitch Sta of neutral switch signal, Key, ACS, EPS, NGS.
As Fig. 2, shown in Figure 3,7 groups of variable resistor knobs of mark Tair, Tcw, Toil, Tac, TPS, MAP, AFM are respectively applied for the signal that 7 groups of sensors such as simulated engine intake air temperature, engine coolant temperature, oil temperature, on-board air conditioner temperature, throttle opening, air-distributor pressure, inlet air flow generate in the control panel 1.These 7 groups of circuit provide reference power source by control unit of engine 12, adjusting by variable resistor R1, R4, R5, R8, R9, R12, R13, obtain different output voltages, offer the signal detection module 3 of control unit of engine 12 and input ECU respectively, the different output voltages that adjusting variable resistor knob obtains are used to simulate the different sampled value of real engine sensor.
As Fig. 2, shown in Figure 4,3 of mark Vbat, OS1, OS2 groups of variable resistor knobs are respectively applied for the signal that 3 groups of sensors such as imitated storage battery voltage, engine exhaust system upstream oxygen sensor, engine exhaust system catalyst monitoring sensor generate in the control panel 1.These 3 groups of circuit provide reference power source by the power management module 4 of test macro, according to test assignment require its reference voltage can be respectively+1V (offering OS1, OS2) ,+5V (offering OS1, OS2) ,+12V (offering Vbat) ,+24V specifications such as (offering Vbat).The different output voltages that adjusting variable resistor knob obtains are used to simulate the different sampled value of the real engine exhaust gas oxygen sensor magnitude of voltage different with accumulator, promptly pass through the adjusting of variable resistor R35, R37, R39, obtain different output voltages, supply engine control module (ECU) and ECU input signal detection module 3 are gathered simultaneously.
As Fig. 2, shown in Figure 5,5 groups of variable resistor knobs of mark CAS, PIS, VSS, KSa, KSf are respectively applied for the simulation control that 4 groups of sensor signals such as engine crankshaft corner position and rotating speed, piston phase place identification camshaft speed, the speed of a motor vehicle, pinking are generated in the control panel 1.These 5 groups of circuit provide reference power source by control unit of engine 12, adjusting by variable resistor R34, R36, R38, R40, R41, obtain different output voltages, controlled frequency signal generator 2 is generated the analogue value of each sensors again by frequency of signal generator 2.
As Fig. 2, shown in Figure 6,5 groups of keyswitch circuit of mark Sta, Key, ACS, EPS, NGS are respectively applied for the signal that 5 groups of switches such as motor vehicle starting switch, firing key signal, air-conditioning request signal, power-assisted steering signal, neutral switch signal generate in the control panel 1.These 5 groups of circuit provide reference power source by the power management module 4 of test macro, its reference voltage according to the requirement of test assignment can be respectively+5V ,+12V ,+specifications such as 24V.By the control of switch S 1～S5, obtain 0V or+output voltage of 5V/12V/24V, offer the signal detection module 3 of control unit of engine (ECU) and input ECU, the switching signal when being used to simulate the real engine operation respectively.
As shown in Figure 7, described frequency of signal generator module 2 includes AD conversion unit ADC1 and the micro-control unit MCU1 with analog-digital conversion function, described AD conversion unit ADC1 will by in the control panel 15 groups be used to control engine crankshaft corner position and rotating speed, piston phase place identification camshaft speed, the speed of a motor vehicle, the variable resistor knob CAS that the emulation of 4 kinds of frequencies of pinking (square wave) signal generates, PIS, VSS, KSa, the signal that KSf generated carries out digital-to-analog conversion, generates through micro-control unit MCU1 and represents engine crankshaft corner position and rotating speed, piston phase place identification camshaft speed, the square-wave signal of the speed of a motor vehicle is to control unit of engine 12.
As shown in Figure 8, described ECU input signal detection module 3 includes filtering circuit and the bleeder circuit that links to each other with this filtering circuit, constitute control panel 1 and frequency of signal generator 2 to the interface channel between the test macro signal processing module 6, described ECU input signal detection module 3 is furnished with multimeter, oscillographic probe measuring point.
Shown in Fig. 9-12, described ECU output signal detection module 5 is used to detect the engine management system actuator control signal that ECU exports.Include six groups of input ends and link to each other with control unit of engine 12, the fuel injector control signal testing circuit that output terminal links to each other with signal processing module 6 has six groups of fuel injector control signals in the circuit, be labeled as INJ1～INJ6; Three groups of input ends link to each other with control unit of engine 12, and the ignition coil control signal testing circuit that output terminal links to each other with signal processing module 6 has three groups of ignition coil control signals in the circuit, be labeled as IGN1～IGN3; Three groups of input ends link to each other with control unit of engine 12, and the relay control signal testing circuit that output terminal links to each other with signal processing module 6 has three group relay control signals in the circuit, be labeled as Rly1～Rly3; Three groups of input ends link to each other with control unit of engine 12, and the solenoid valve control circuit that output terminal links to each other with signal processing module 6 has three groups of solenoid control signals in the circuit, be labeled as Val1～Val3; Described ECU output signal detection module 5 has constituted control unit of engine 12 to the interface channel between the test macro signal processing module 6.Described ECU output signal detection module 5 is furnished with multimeter, oscillographic probe measuring point.
As shown in figure 13, described signal processing module 6 is made of AD conversion unit ADC2 with analog-digital conversion function and the micro-control unit MCU2 that has the input capture function; Described AD conversion unit ADC2 sampling is by first to the tenth variable resistor knob Tair on the control panel 1, Tcw, Toil, Tac, TPS, MAP, AFM, Vbat, OS1, the voltage analog signal that these 10 groups of variable resistor knobs of OS2 are regulated, the digital signal that micro-control unit MCU2 receives will be converted to, output after micro-control unit MCU2 handles, promptly, after micro-control unit MCU2 receives the numerical value of analog-to-digital conversion module group ADC2 transmission, calculate corresponding Engine Inlet Temperature, engine coolant temperature, oil temperature, the on-board air conditioner temperature, throttle opening, air-distributor pressure, the inlet air flow, battery tension, engine exhaust system upstream oxygen sensor magnitude of voltage, 10 groups of sensor Simulation values such as engine exhaust system catalyst monitoring sensor magnitude of voltage; Described micro-control unit MCU2 also directly receives the keyswitch closure state signal by the motor vehicle starting switch of first to the 5th keyswitch Sta on the control panel 1, Key, ACS, these 5 groups of switching knobs adjustings of EPS, NGS, ignition key switch, air-conditioning request switch, power-assisted steering switch, neutral switch; Directly receive the last lower edge time interval information signal of the engine crankshaft corner position regulated by the 11 to the 15 variable resistor knob CAS on the control panel 1, PIS, VSS, KSa, KSf and rotating speed, piston phase place identification camshaft speed, the speed of a motor vehicle, detonation signal ripple; And directly receive the signal that ECU output signal detection module 5 is exported, promptly directly catch the last lower edge time interval information of counting INJ1～INJ6, IGN1～IGN3,15 groups of oil spout actions such as Rly1～Rly3, Val1～Val3, ignition coil action, the actuating of relay, valve events control signal ripple, and further calculating respectively organize the distributive value of fuel injector, respectively organize ignition coil actuation time and ignition advance angle, respectively organize valve and relay actuation time; Described micro-control unit (MCU2) sends display control module 7 and test macro communication interface module 9 to after with above-mentioned each signal Processing.Micro-control unit MCU2 in the signal processing module 6 also is used for synchronous each switching signal of footmark calculated signals, the frequency signal according to engine crankshaft corner position and tach signal, the phase place of actuator action control signal.
As shown in figure 14, described display control module 7 is the interface channels between signal processing module 6 and the display panel 8.Display panel 8 mainly is made up of LCD and corresponding integral control circuit, and liquid crystal control circuit has the micro-control unit 3MCU3 of self.Display control module 7 shown in the accompanying drawing 14 provides data to be displayed and controlled variable for micro-control unit 3MCU3, and simultaneously, display control module 7 provides corresponding power supply for the LCD and the display control circuit of display panel 8.
As shown in figure 15, described test macro communication interface module 9 is the USB interface communication module, test macro communication interface module 9 includes the micro-control unit MCU4 and the corresponding power supply processing circuit thereof of control USB communication to be formed, and test macro communication interface module 9 is used to connect development and testing computing machine 10.
In the vehicle engine electronic control unit testing system of the present invention, the model of the microcontroller among described micro-control unit MCU1, MCU2 and the MCU4 is the 9s12XEP100 of Freescale.
The variable resistor combination adjusting method that is used for above-mentioned vehicle engine electronic control unit testing system of the present invention, be to regulate the engine crankshaft rotating speed by the 11 variable resistor knob CAS in the control panel 1 as shown in Figure 2, regulate the square wave number that the engine crankshaft revolution generates by the 12 variable resistor knob PIS again, regulate the difference of decision engine crankshaft and camshaft piston phase place simultaneously by the 12 variable resistor knob PIS; Regulate the ratio of gear of the engine crankshaft of vehicle by the 13 variable resistor knob VSS, thereby the engine crankshaft revolution speed calculating of regulating according to the 11 power transformation resistance knob CAS obtains the speed of a motor vehicle to axletree; Make up adjusting by the 14 and the 15 variable resistor knob KSf, KSa in the control panel 1, and then through the AD conversion unit ADC1 of frequency of signal generator 2 the 4th, the five-way road carries out digital-to-analog conversion, the micro-control unit MCU1 by frequency of signal generator 2 generates the square-wave signal of representing combustion knock at last; Described the 14 variable resistor knob KSf regulates the frequency of the square-wave signal of combustion knock, and described the 15 variable resistor knob KSa regulates the amplitude of the square-wave signal of combustion knock; Further emulation generated the triangular signal of representing combustion knock after described frequency of signal generator module 2 connected corresponding triangular wave generating circuit; Further emulation generated the sine wave signal of representing combustion knock after described frequency of signal generator module 2 connected corresponding sinusoidal wave generation circuit.
AD conversion unit ADC1 in the frequency of signal generator module 2 voltage analog signal that the 11 to the 15 group of variable resistor knob CAS, PIS, VSS, KSa, KSf regulate of sampling converts thereof into the digital signal that micro-control unit MCU1 can receive.Micro-control unit MCU1 accepts the variable resistor knob and regulates control, generates 4 groups of simulate signals such as engine crankshaft corner position and tach signal, piston phase place identification camshaft speed signal, vehicle speed signal, detonation signal.
The concrete combination adjusting method of each frequency signal is as follows:
The resistance of regulating the 11 variable resistor knob of mark CAS in the control panel 1 from zero to maximum, make its output end voltage change to the reference power source service voltage from zero, be 0V～+ 5V, first passage through the AD conversion unit ADC1 of frequency of signal generator module 2 carries out digital-to-analog conversion, converts thereof into the digital signal that micro-control unit MCU1 can receive.When AD conversion unit ADC1 was the ADC of 14bit, transforming numerical was 0～16383, and micro-control unit MCU1 generates rotating speed 0rpm～16383rpm, and precision is 1rpm.Micro-control unit MCU1 gives birth to the square-wave signal of represent engine crankshaft corner position and rotating speed accordingly after receiving the transforming numerical that AD conversion unit ADC1 first passage transmits, and each square wave number that transfers out of engine crankshaft also need be determined by the 12 variable resistor knob PIS.
The resistance of regulating the 12 variable resistor knob of mark PIS in the control panel 1 from zero to maximum, make its output end voltage change to the reference power source service voltage from zero, be 0V～+ 5V, second channel through the AD conversion unit ADC1 of frequency of signal generator module 2 carries out digital-to-analog conversion, converts thereof into the digital signal that micro-control unit MCU1 can receive.When AD conversion unit ADC1 was the ADC of 14bit, transforming numerical was 0～16383.Different numerical value represent the out of phase between the different numbers arrangements of the square wave of engine crankshaft revolution and piston phase place identification camshaft and the engine crankshaft poor.Numerical value 1～800,801～1600,1601～2400,15201～16000 represent 9-2 respectively, 10-2,12-2,15-2,18-2,20-2,24-2,30-2,36-2,45-2,60-2,2-1,3-1,4-1,6-1,9-1,10-1,12-1,15-1, the square wave number that 20 kinds of engine crankshaft revolutions such as 18-1 are commonly used is arranged (herein, symbol 9-2 represents that the engine crankshaft revolution is 9 uniform square waves, it is vacancy that 2 square wave positions are wherein arranged, promptly represent 9 teeth to lack the engine speed of 2 teeth and the signal that the CAP sensor generates, other symbol implication similarly).1～718 to represent phase differential between piston phase place identification camshaft and the engine crankshaft respectively be 1 degree～359 degree in the numerical value 1～800,719～800 all to represent phase differential between piston phase place identification camshaft and the engine crankshaft be 0 degree in the numerical value 1～800, and the phase differential of other group numeric representation by that analogy; On behalf of the square wave number of engine crankshaft revolution, numerical value 16001～16383 and 0 all arrange 60-2, and the phase differential between piston phase place identification camshaft and the engine crankshaft is 0 degree.Micro-control unit MCU1 gives birth to the square-wave signal of representing piston phase place identification camshaft speed accordingly after receiving the transforming numerical that AD conversion unit ADC1 second channel transmits.
The resistance of regulating the 13 variable resistor knob of mark VSS in the control panel 1 from zero to maximum, make its output end voltage change to the reference power source service voltage from zero, be 0V～+ 5V, third channel through the AD conversion unit ADC1 of frequency of signal generator module 2 carries out digital-to-analog conversion, converts thereof into the digital signal that micro-control unit MCU1 can receive.When AD conversion unit ADC1 was the ADC of 14bit, transforming numerical was 0～16383.Numerical value is represented the product value of engine crankshaft to the total ratio of gear between the wheel, radius of wheel, speed of crankshaft.Numerical value 0～2000,2001～4000,4001～6000 ..., 14001～16383 represent 8 kinds of gears such as neutral gear, 1 grade, 2 grades, 3 grades, 4 grades, 5 grades, 6 grades, reverse gear respectively.It is zero that numerical value 0～1000 is represented the neutral gear and the speed of a motor vehicle; It is any random value that numerical value 1001～2000 is represented the neutral gear and the speed of a motor vehicle; Other numerical value is represented overall ratios different under the corresponding gear and radius of wheel, engine crankshaft corner position and rotating speed three's the resulting speed of a motor vehicle of product.Micro-control unit MCU1 gives birth to the square-wave signal of representing the speed of a motor vehicle accordingly after receiving the numerical value that AD conversion unit ADC1 third channel transmits.
Regulate by mark CAS, PIS, the combination of VSS the 11 to the 13 variable resistor knob in the above-mentioned control panel 1, and then carry out digital-to-analog conversion through first, second, third passage of the AD conversion unit ADC1 of frequency of signal generator module 2, generate the square-wave signal of representing engine crankshaft corner position and rotating speed, piston phase place identification camshaft speed, the speed of a motor vehicle by the micro-control unit MCU1 of frequency of signal generator module 2 at last.
The combinations thereof control method is meant by the 11 variable resistor knob CAS regulates the engine crankshaft rotating speed, regulate the square wave number that the engine crankshaft revolution generates by the 12 variable resistor knob PIS again, regulate the piston phase difference value of decision engine crankshaft and camshaft simultaneously by the 12 variable resistor knob PIS; Can regulate the ratio of gear of vehicle by the 13 power transformation resistance knob VSS, thereby obtain the speed of a motor vehicle according to the engine crankshaft revolution speed calculating.
The resistance of regulating the 14, the 15 liang of group variable resistor knob of mark KSa, KSf in the control panel 1 from zero to maximum, make its output end voltage change to the reference power source service voltage from zero, be 0V～+ 5V, through the AD conversion unit ADC1 of frequency of signal generator module 2 the 4th, the five-way road carries out digital-to-analog conversion, converts thereof into the digital signal that micro-control unit MCU1 can receive.When AD conversion unit ADC1 was the ADC of 14bit, transforming numerical was 0～16383.The KSa knob be used to regulate amplitude that simulation generates the detonation sensor signal from zero to 5V; The KSf knob is used to regulate simulation and generates the frequency of detonation sensor signal from 0Hz～16383Hz.Micro-control unit MCU1 generates the square-wave signal of representing pinking accordingly after receiving the numerical value that AD conversion unit ADC1 the 4th, five-way road transmit.The detonation sensor simulate signal also can become the sine wave or the triangular signal of frequency and adjustable amplitude value through the relevant hardware processing of circuit.
AD conversion unit ADC1 also can select other accuracy A DC, and when being the ADC of 12bit such as ADC1, transforming numerical is 0～4095, and when ADC1 was the ADC of 16bit, transforming numerical was 0～65535.Its implication was different when every group of numerical value specifically was applied to the 11 to the 15 group of variable resistor knob CAS, PIS, VSS, KSa, KSf---for example, be applied to and generate engine crankshaft corner position and tach signal, when the ADC1 first passage is 12bit, it is 0rpm～12285rpm that output numerical value indication MCU1 generates rotating speed, and precision is 3rpm; When the ADC1 first passage was 16bit, output numerical value indication MCU1 generated rotating speed 0rpm～13107rpm, and precision is 0.2rpm.
Claims (6)
1. a vehicle engine electronic control unit testing system is characterized in that, comprising: control panel (1); Frequency of signal generator module (2); ECU input signal detection module (3); Power management module (4); ECU output signal detection module (5); Signal processing module (6); Display control module (7); Display panel (8) and test macro communication interface module (9), wherein,
Described signal processing module (6) is made of AD conversion unit with analog-digital conversion function (ADC2) and the micro-control unit (MCU2) that has an input capture function;
Described signal processing module (6) detects the simulating vehicle of control panel (1) and frequency of signal generator module (2) generation and the sensor Simulation signal of engine operation by ECU input signal detection module (3);
Described signal processing module (6), by ECU output signal detection module (5), the actuator control signal of the engine management system of detection of engine control module (12) output;
Described signal processing module (6) by display control module (7), is gone up test mode, conditional parameter and control unit of engine (12) performance data of testing and to be shown at display panel (8);
Described signal processing module (6) by test macro communication interface module (9), sends test mode, conditional parameter and control unit of engine (12) performance data of testing to development analysis with computing machine (10);
Described power management module (4) provides various reference power supplies for test macro and control unit of engine (12).
2. vehicle engine electronic control unit testing system according to claim 1 is characterized in that, described control panel (1) includes 15 groups of variable resistor knobs and 5 groups of keyswitches.Wherein, there are 10 groups to be used for the simulated engine intake air temperature respectively in described 15 groups of variable resistor knobs, engine coolant temperature, oil temperature, the on-board air conditioner temperature, throttle opening, air-distributor pressure, the inlet air flow, battery tension, first to the tenth variable resistor knob (Tair of engine exhaust system upstream oxygen sensor value and engine exhaust system catalyst monitoring sensor value, Tcw, Toil, Tac, TPS, MAP, AFM, Vbat, OS1, OS2), there are 5 groups to be used to control engine crankshaft corner position and rotating speed, piston phase place identification camshaft speed, the speed of a motor vehicle, the 11 to the 15 variable resistor knob (CAS that the emulation of 4 kinds of frequency signals of pinking generates, PIS, VSS, KSa, KSf); Described 5 groups of keyswitches are first to the 5th keyswitches (Sta, Key, ACS, EPS, NGS) that are respectively applied for analog machine motor-car starting switch signal, firing key signal, air-conditioning request signal, power-assisted steering signal, neutral switch signal.
3. vehicle engine electronic control unit testing system according to claim 1, it is characterized in that, described frequency of signal generator module (2) includes AD conversion unit (ADC1) and the micro-control unit (MCU1) with analog-digital conversion function, described AD conversion unit (ADC1) will by in the control panel (1) 5 groups be used to control engine crankshaft corner position and rotating speed, piston phase place identification camshaft speed, the speed of a motor vehicle, variable resistor knob (the CAS that the emulation of 4 kinds of frequency signals of pinking generates, PIS, VSS, KSa, KSf) signal that is generated carries out digital-to-analog conversion, generates through micro-control unit (MCU1) and represents engine crankshaft corner position and rotating speed, piston phase place identification camshaft speed, the square-wave signal of the speed of a motor vehicle is to control unit of engine (12).
4. vehicle engine electronic control unit testing system according to claim 1, it is characterized in that, described ECU input signal detection module (3) includes filtering circuit and the bleeder circuit that links to each other with this filtering circuit, constitutes control panel (1) and frequency of signal generator (2) to the interface channel between the test macro signal processing module (6); Described ECU input signal detection module (3) is furnished with multimeter, oscillographic probe measuring point.
5. vehicle engine electronic control unit testing system according to claim 1, it is characterized in that, described ECU output signal detection module (5) includes six groups of input ends and links to each other with control unit of engine (12), the fuel injector control signal testing circuit that output terminal links to each other with signal processing module (6); Three groups of input ends link to each other with control unit of engine (12), the ignition coil control signal testing circuit that output terminal links to each other with signal processing module (6); Three groups of input ends link to each other with control unit of engine (12), the relay control signal testing circuit that output terminal links to each other with signal processing module (6); Three groups of input ends link to each other with control unit of engine (12), the solenoid valve control circuit that output terminal links to each other with signal processing module (6); Described ECU output signal detection module (5) has constituted control unit of engine (12) to the interface channel between the test macro signal processing module (6); Described ECU output signal detection module (5) is furnished with multimeter, oscillographic probe measuring point.
6. variable resistor combination adjusting method that is used for the described vehicle engine electronic control unit testing system of claim 1, it is characterized in that, regulate the engine crankshaft rotating speed by the 11 variable resistor knob (CAS) in the control panel (1), regulate the square wave number that the engine crankshaft revolution generates by the 12 variable resistor knob (PIS) again, regulate the difference of decision engine crankshaft and camshaft piston phase place simultaneously by the 12 variable resistor knob (PIS); Regulate the ratio of gear of the engine crankshaft of vehicle by the 13 variable resistor knob (VSS), thereby the engine crankshaft revolution speed calculating of regulating according to the 11 variable resistor knob (CAS) obtains the speed of a motor vehicle to axletree; Regulate by the combination of the 14 and the 15 variable resistor knob (KSf, KSa) in the control panel (1), and then the AD conversion unit (ADC1) of process frequency of signal generator (2) is carried out digital-to-analog conversion, micro-control unit (MCU1) by frequency of signal generator (2) generates the square-wave signal of representing combustion knock at last, described the 14 variable resistor knob (KSf) is regulated the frequency of the square-wave signal of combustion knock, and described the 15 variable resistor knob (KSa) is regulated the amplitude of the square-wave signal of combustion knock.
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