CN101833331A - Testing system and method for electronic control unit of automobile engine - Google Patents
Testing system and method for electronic control unit of automobile engine Download PDFInfo
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- CN101833331A CN101833331A CN 201010185413 CN201010185413A CN101833331A CN 101833331 A CN101833331 A CN 101833331A CN 201010185413 CN201010185413 CN 201010185413 CN 201010185413 A CN201010185413 A CN 201010185413A CN 101833331 A CN101833331 A CN 101833331A
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Abstract
The invention discloses a testing system and a testing method for an electronic control unit of an automobile engine. The testing system comprises a signal simulation unit, an electronic control unit, a load unit and a monitoring unit, wherein the signal simulation unit is connected with the electronic control unit by a motor wiring harness and used for simulating cranking signals and cam signals generated when a motor operates according to an externally-input rotate speed and sending the cranking signals and the cam signals to the electronic control unit; the electronic control unit is used for acquiring on-load running control signals according to the cranking signals and the cam signals as well as control parameters and sending the on-load running control signals to the load unit; the load unit is an actual engine component, connected with the electronic control unit by the motor wiring harness and used for executing action according to the on-load running control signals sent by the electronic control unit; and the monitoring unit is used for monitoring the states of the electronic control unit and the load unit, and sending the control parameters input by the user to the electronic control unit in a calibration state. The testing system and the testing method can simultaneously carry out off-vehicle test on the ECU (electronic control unit) and use the actual engine component to compensate for the reality insufficiency existed of the traditional off-vehicle test so as to achieve the effect of carrying out reliable, low-cost and local test on the ECU (electronic control unit).
Description
Technical field
The present invention relates to technical field of automobile engine, relate in particular to a kind of test macro and method of testing thereof of electronic control unit of automobile engine.
Background technology
Test to electronic control unit of automobile engine (ECU) mainly contains dual mode, and a kind of is that ECU is placed on the actual engine, tests with stand or complete vehicle test, and a kind of is to use a computer fully to carry out virtual test.
The former requires ECU must place on the actual engine, and all input and output of ECU all directly are connected with automobile, and all data all are measured datas.Will cause testing cost high like this, and when carrying out platform experiment, have the uncertain factor of much system equipment being damaged, threatens even experimenter's safety.Simultaneously, when on real engine, testing, be subjected to multiple factor affecting such as plant equipment, sensor, can not well judge the quality of ECU.
Carry out virtual test if use a computer fully and can cause the deficiency of validity again, even if carry out virtual test completely under the situation that guarantees validity, system that it is developed and technical costs are too high again.
Summary of the invention
The objective of the invention is to propose a kind of method of testing and system of electronic control unit of automobile engine, can reach the purpose of testing ECU reliably, at low cost used simultaneously the real engine parts to remedy the problem of traditional validity deficiency of testing from car again from car test ECU.
In order to realize purpose of the present invention, the present invention adopts following technical scheme:
A kind of test macro of electronic control unit of automobile engine, this test macro comprises signal imitation unit, ECU (Electrical Control Unit), monitoring unit and load unit;
Described signal imitation unit is connected with described ECU (Electrical Control Unit) by engine wiring harness, is used for the rotating speed according to the outside input, and crankshaft signal and the cam signal that produces during the simulated engine running also sends to ECU (Electrical Control Unit);
Described ECU (Electrical Control Unit) is connected with described load unit, monitoring unit and signal imitation unit, under driving states, obtains the load running control signal and sends it to load unit according to crankshaft signal, cam signal and predetermined controlled variable; Under the demarcation state, obtain the load running control signal and send it to load unit by the controlled variable of monitoring unit input according to crankshaft signal, cam signal and user;
Described load unit is actual engine components, is connected with ECU (Electrical Control Unit) by engine wiring harness, and the load running control signal that is used for sending according to described ECU (Electrical Control Unit) is carried out action;
Described monitoring unit is used to monitor the state of ECU (Electrical Control Unit) and load unit; Controlled variable with user's input under the demarcation state sends to ECU (Electrical Control Unit).
Preferably, described load unit comprises fuel injection device, ignition coil, spark plug and electronic throttle;
Described load running control signal comprises fuel injection signal, ignition signal; Under the demarcation state, this load running control signal further comprises the throttle opening signal.
Preferably, described monitoring unit is reached at the ECU (Electrical Control Unit) watchdog routine of this test macro establishment by oscillograph, personal computer to be formed, and watchdog routine is used to monitor and control the running status of ECU (Electrical Control Unit); Oscillograph is connected to engine wiring harness between ECU (Electrical Control Unit) and the load unit by the electric current clamp; Personal computer links to each other with ECU (Electrical Control Unit) by communication line.
The invention also discloses a kind of method of testing of electronic control unit of automobile engine, this method of testing is applied to comprise aforementioned any one test macro; This method may further comprise the steps:
The crankshaft signal and the cam signal that produce during signal imitation unit simulation engine running;
Monitoring unit need be set in driving states or demarcation state by test;
When monitoring unit was in driving states, ECU (Electrical Control Unit) was obtained the load running control signal according to crankshaft signal, cam signal and predetermined controlled variable that described signal imitation unit produces; Load unit is carried out action by described load running control signal; Monitoring unit shows described cam signal and described load running control signal;
When monitoring unit was in the demarcation state, the controlled variable that crankshaft signal, cam signal and the user that ECU (Electrical Control Unit) produces according to described signal imitation unit imports by monitoring unit was obtained the load running control signal; Load unit is carried out action by described load running control signal; Monitoring unit shows described cam signal, controlled variable and described load running control signal;
Judge whether operate as normal of ECU (Electrical Control Unit) according to data presented in the monitoring unit.
Wherein, when described monitoring unit was in driving states, ECU (Electrical Control Unit) was obtained the load running control signal according to crankshaft signal, cam signal and predetermined controlled variable that described signal imitation unit produces, comprising:
1. ECU (Electrical Control Unit) is calculated the present engine rotating speed according to the crankshaft signal of signal imitation unit simulation;
2. table look-up with the throttle opening that sets in advance according to the present engine rotating speed that calculates and obtain corresponding fuel injection pulsewidth and ignition advance angle;
3. determine the zero hour of lighting a fire according to cam signal that receives and ignition advance angle, determine that according to cam signal that receives and the fuel injection advance angle that sets in advance the fuel injection beginning constantly;
4. generate ignition signal the zero hour according to igniting, the based on fuel injection beginning constantly and fuel injection pulsewidth generation fuel injection signal, with fuel injection signal and ignition signal as the load running control signal;
When described monitoring unit was in the demarcation state, the controlled variable that crankshaft signal, cam signal and the user that ECU (Electrical Control Unit) produces according to described signal imitation unit imports by monitoring unit was obtained the load running control signal, comprising:
1. ECU (Electrical Control Unit) is determined the zero hour of lighting a fire according to the user by the ignition advance angle of monitoring unit input and the cam signal of signal imitation unit simulation, determines that according to fuel injection advance angle that sets in advance and described cam signal the fuel injection beginning constantly;
2. generate ignition signal the zero hour according to lighting a fire, the based on fuel injection beginning constantly and the fuel injection pulsewidth of user by monitoring unit control generate fuel injection signal, the throttle opening signal that the ignition signal of the fuel injection signal that generates, generation and user are controlled by monitoring unit is as the load running control signal.
Technique scheme only is an optimal technical scheme of the present invention.The present invention utilizes watch-dog that the running status of ECU is monitored, thereby ECU is tested, judges whether ECU breaks down by the running environment of the method simulation ECU that utilizes software and hardware and combine.The present invention is simple in structure, adopt technical scheme of the present invention can be efficiently, low-cost, test ECU (Electrical Control Unit) safely.
Description of drawings
Fig. 1 is to be the connection diagram of a kind of electronic control unit of automobile engine test macro of the embodiment of the invention.
Fig. 2 is the process flow diagram of a kind of electronic control unit of automobile engine method of testing of the embodiment of the invention.
Embodiment
Fig. 1 is the connection diagram of engine electronic control unit testing system of the present invention, and as shown in Figure 1, this test macro comprises: monitoring unit 1, ECU (Electrical Control Unit) (ECU) 2, load unit 3 and signal imitation unit 4.Wherein, ECU (Electrical Control Unit) 2 is in the core position of total system.
Signal imitation unit 4 is connected with ECU (Electrical Control Unit) 2 by engine wiring harness, is used for the rotating speed according to user's input, the crankshaft signal and the cam signal of the rotating speed correspondence that produces during the simulated engine running, and send to ECU (Electrical Control Unit) 2.Wherein, the prestored data of rotating speed and corresponding crankshaft signal, cam signal of signal imitation unit 4 are searched data and are obtained corresponding crankshaft signal and cam signal behind the rotating speed that receives user's input.
ECU (Electrical Control Unit) 2 is connected with described load unit, monitoring unit and signal imitation unit, under the demarcation state, obtains the load running control signal according to crankshaft signal, cam signal and predetermined controlled variable and sends to load unit; Under driving states, obtain the load running control signal by the controlled variable of monitoring unit 1 input and send to load unit 3 according to crankshaft signal, cam signal and user.
Load unit 3 is actual engine components, is connected with ECU (Electrical Control Unit) 2 by engine wiring harness, carries out action according to the load running control signal that ECU (Electrical Control Unit) 2 is sent.
By above technical scheme as seen, the present invention has been owing to used actual engine components, thereby remedied traditional from the validity deficiency of car test survey on practical devices and data.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
In the present embodiment, load unit 3 comprises Fuelinjection nozzle, ignition coil, spark plug and air throttle, and these four parts are directly with driving work such as corresponding fuel injection signal, ignition signal, throttle opening signal on the engine wiring harness.In this case, the load running control signal that ECU (Electrical Control Unit) need send to load unit comprises fuel injection signal, ignition signal and joint Qianmen aperture signal, and wherein, joint Qianmen aperture signal is only accepted the control of monitoring unit 1 under the demarcation state.
In the present embodiment, monitoring unit 1 comprises personal computer (PC), oscillograph and the watchdog routine of working out at this test macro.Watchdog routine is used to monitor and control the running status of ECU (Electrical Control Unit), and oscillograph is by the engine wiring harness between electric current clamp connection ECU (Electrical Control Unit) 2 and the load unit 3, thereby the collection ECU (Electrical Control Unit) sends to the ignition signal and the fuel injection signal of load unit.PC links to each other with ECU (Electrical Control Unit) 2 by the RS232 communication interface, obtains some information from ECU (Electrical Control Unit) 2, for example the temperature and pressure signal of gathering from fuel tank.Certainly, also can make full use of each passage of oscillograph, oscillograph is issued cam signal, the crankshaft signal of ECU (Electrical Control Unit) 2 by its test pencil acquired signal analogue unit 4 so.So, in the process of follow-up comparison signal, various signals can be simultaneously displayed in the oscillograph, help the contrast between rising edge, the negative edge.
Signal imitation unit 4 is made up of software and hardware two parts, and software comprises that it is used for the output of control signal analogue unit 4 with the Control Software of Labview establishment; Hardware comprises analog output unit, and it is used for digital quantity is converted to analog quantity, with the crankshaft position sensor of accurate simulation reality and the output signal of CMPS Camshaft Position Sensor.
The test process of the described test macro of present embodiment is described below in conjunction with Fig. 2.Before test, with correct being connected on the ECU (Electrical Control Unit) in signal imitation unit, and ECU (Electrical Control Unit) correctly linked to each other with load unit according to the definition of the wire harness of ECU.Oscillograph in the monitoring unit connects corresponding wire harness by the electric current clamp, to obtain ignition signal and fuel injection signal.
Fig. 2 is the process flow diagram of embodiment of the invention engine electric-controlled unit method of testing, and referring to Fig. 2, concrete steps are as follows:
If watchdog routine is set in driving states, execution in step 2a to 5a then, specific as follows:
2a, signal imitation unit be according to the rotating speed of user's input, simulated engine run well the electric signal of requisite crankshaft signal and cam signal, and electric signal outputed to ECU by engine wiring harness.
After 3a, ECU detect electric signal, calculate the present engine rotating speed according to current crankshaft signal, according to present engine rotating speed that calculates and the throttle opening that sets in advance, look into the MAP parameter list and obtain corresponding fuel injection pulsewidth and ignition advance angle, determine the zero hour of lighting a fire according to cam signal and ignition advance angle, determine that according to cam signal and the fuel injection advance angle that sets in advance the fuel injection beginning constantly.Generate ignition signal the zero hour according to igniting, the based on fuel injection beginning constantly and fuel injection pulsewidth generate fuel injection signal, then with fuel injection signal and ignition signal as the load running control signal, send to the load unit execution.Fuel injection signal is exported to the fuel injection signal that also needs before the load unit square wave and is converted to the big electric current that load unit can discern and opens the waveform signal that little electric current keeps.
Wherein, the throttle opening that sets in advance can be that the user manually is provided with on air throttle, also can connect pedal on air throttle, by the pedal angle throttle opening is set.
The described injection advance angle that sets in advance of this step is fixed as 330 ° usually, but injection advance angle is made as 360 ° in engine starting process.
The described MAP parameter list of this step is a three-dimensional table, and the MAP parameter list of fuel injection pulsewidth signal has been put down in writing: the fuel injection pulsewidth of different rotating speeds and throttle opening correspondence; The MAP parameter list of electronic spark advance angle signal has been put down in writing: the ignition advance angle of different rotating speeds and throttle opening correspondence.
Need to prove, cam signal comprises two big two little pwm signals, the corresponding cylinder of each PWM, therefore fuel injection signal that obtains according to cam signal and the ignition signal fuel injection signal and the ignition signal that are each cylinder, fuel injection signal as herein described and ignition signal all are signals of each cylinder, hereinafter specified otherwise no longer.
4a, monitoring unit show the control situation of ECU and the implementation status of load unit.
Wherein, the control situation of ECU comprises cam signal; The implementation status of load unit is the load running control signal that ECU sends to load unit.Monitoring unit obtains the load running control signal and can obtain the load running control signal of numerical value form and be presented on the PC from ECU by RS232, and perhaps the engine wiring harness that preferably directly is connected with load unit from ECU by oscillographic electric current clamp obtains and lights a fire and the waveform signal of fuel injection and be presented at oscillograph.
Preferably, ECU can also obtain fuel cell temperature and pressure information and send to monitoring unit from fuel tank and show by sensor.
Cam signal that shows in 5a, the comparison monitor window and load running control signal are determined whether operate as normal of ECU, end of test (EOT).
If watchdog routine is set in the demarcation state, execution in step 2b to 5b then, concrete steps are as follows:
2b, signal imitation unit be according to the rotating speed of user's input, simulated engine run well the electric signal of requisite crankshaft signal, cam signal, and electric signal outputed to ECU by engine wiring harness.
3b, in the visualization window of watchdog routine, manually control one or more controlled variable of engine, this controlled controlled variable generally includes ignition advance angle, fuel injection pulsewidth and throttle opening, can certainly comprise the fuel injection advance angle, but in the present embodiment, the fuel injection advance angle adopts 330 ° and 360 ° and is fixed among the ECU, 360 ° of engine start stage employings.Fuel injection pulsewidth signal, electronic spark advance angle signal, throttle opening signal can not be controlled by ECU under driving states.
4b, ECU detects the crankshaft signal of controlled controlled variable and signal imitation unit simulation, behind the cam signal, determine the zero hour of lighting a fire according to the ignition advance angle of user's control and the cam signal of signal imitation unit simulation, generate ignition signal the zero hour according to lighting a fire, determine that according to the fuel injection advance angle and the described cam signal that set in advance at ECU the fuel injection beginning constantly, the fuel injection pulsewidth of the based on fuel injection beginning moment and user's control generates fuel injection signal, with the fuel injection signal that generates, the throttle opening signal of the ignition signal that generates and user's control sends to load unit and carries out as the load running control signal.
5b, monitoring unit show the control situation of ECU and the implementation status of load unit.
Wherein, the control situation of ECU comprises cam signal and the controlled variable of revising by monitoring unit; The implementation status of load unit is the load running control signal that ECU sends to load unit.Equally, ECU can also obtain fuel cell temperature and pressure information and send to monitoring unit and show from fuel tank.
The cam signal that shows in 6b, the comparison monitor window, controlled variable and load running control signal are determined whether operate as normal of ECU, end of test (EOT).
Below in conjunction with the test process of hydrogen engine ECU, further specify implementation process of the present invention.The test of hydrogen engine ECU is a requisite ingredient in the hydrogen engine ECU exploitation.Comprehensively, test reliably can greatly reduce the cost of development of ECU, the test of ECU becomes a very important ring in the ECU performance history.
By these typical tests application of the present invention can be described better.The testing process of present embodiment comprises: engine speed test, ignition advance angle test, the test of spray hydrogen pulsewidth, the test of spray hydrogen angle of advance, throttle opening test.Below a plurality of experimentations only be to be example with the hydrogen engine, for other engines, natural gas engine for example, test process is identical.
(a) engine speed test
Before the test, watchdog routine is set in the demarcation state, and enabling signal analogue unit Control Software.Engine speed in the conditioning signal analogue unit Control Software is provided with project, engine speed is set to a certain default engine speed value, generate corresponding crankshaft signal and cam signal according to this tachometer value, and sending to ECU, ECU calculates tachometer value and sends to monitoring unit according to crankshaft signal and shows.Observe the tachometer value that shows in the watchdog routine whether with signal imitation unit controls software in the difference of the speed revolution value that is provided with less than default thresholding, if this module operation of determining ECU normally; Otherwise, this module of inspection ECU.
In the test of this engine speed, do not need load running, purpose is whether test ECU can go out tachometer value according to the crankshaft signal correct calculation.
(b) ignition advance angle test
The test of this ignition advance angle comprises following 4 test events:
ECU is according to the crankshaft signal that is received and cam signal and default controlled variable calculating generation load running control signal, and the operation of control load unit;
The ignition signal (being the ruuning situation of load unit) of each cylinder in the cam signal of monitoring unit shows signal analogue unit output and the load running control signal; Preferably, present embodiment is introduced the oscillograph demonstration with the ignition signal of each cylinder and the cam signal of signal imitation unit output.At each cylinder, measure the interval between the corresponding negative edge (corresponding negative edge is meant the square wave negative edge of corresponding respective cylinder in the cam signal) in ignition signal rising edge and the cam signal, if the corresponding falling edge with cam signal of ignition signal rising edge of each cylinder, illustrates that the ECU operation is normal in synchronization.
Test 2, watchdog routine are set to driving states, make signal imitation unit controls software that rotating speed is promoted to 800rpm from 200rpm, to the crankshaft signal and the cam signal of ECU output speed 800rpm correspondence.
ECU obtains load running control signal and the operation of control load unit according to crankshaft signal, cam signal and the controlled variable that sets in advance.
Each cylinder ignition signal in the load running control signal and signal imitation unit output cam signal are introduced the oscillograph demonstration, at each cylinder, measure the interval between the corresponding negative edge in ignition signal rising edge and the cam signal, if the corresponding falling edge with cam signal of the ignition signal rising edge of each cylinder is normal in synchronization explanation ECU operation.Otherwise, the ECU operation exception is described.
Test 3, watchdog routine are set to the demarcation state, make signal imitation unit controls software that rotating speed is reduced to 800rpm from being higher than 800rpm, to the crankshaft signal and the cam signal of ECU output speed 800rpm correspondence.The user regulates ignition advance angle by monitoring unit in the allowed band of ignition advance angle, the value of outer two parameters of order can arbitrarily be provided with, and this test also is indifferent to.This scope of regulating ignition advance angle for example is the 0-180 degree.
The controlled variable that ECU regulates according to crankshaft signal, cam signal and user is obtained load running control signal and the operation of control load unit.
Each cylinder ignition signal and signal imitation unit output cam signal are introduced oscillograph.At the current ignition advance angle of each adjusting, if the current ignition advance angle that is spaced apart user's setting in the ignition signal rising edge of each cylinder and the cam signal between the corresponding negative edge illustrates that the ECU operation is normal.Otherwise, the ECU operation exception is described.
Wherein, when compare with ignition advance angle at the interval of corresponding negative edge in ignition signal rising edge and the cam signal, need after being scaled angle at interval, compare with ignition advance angle again.
Test 4, watchdog routine is set to the demarcation state, and is one or more rotating speed shelves in the middle of 1000～6000rpm with signal imitation unit controls software setting, exports corresponding crankshaft signal and cam signal to ECU on each rotating speed shelves.The user regulates ignition advance angle by monitoring unit in the allowed band of ignition advance angle.
The controlled variable that ECU regulates according to crankshaft signal, cam signal and user is obtained load running control signal and the operation of control load unit.
Each cylinder ignition signal and signal imitation unit output cam signal are introduced oscillograph.At the current ignition advance angle of each adjusting,, measure the interval between the corresponding negative edge in ignition signal negative edge and the cam signal at each cylinder.Interval between the corresponding negative edge of ignition signal negative edge and cam signal is scaled after the angle identical with the current ignition advance angle of setting, and illustrates that then the ECU operation is normal.
(c) spray hydrogen pulsewidth test
Watchdog routine is set in the demarcation state, with a plurality of rotating speed shelves of signal imitation unit controls software set between 800～6000 rev/mins, on each rotating speed shelves, exports corresponding crankshaft signal and cam signal successively to ECU.On watchdog routine, the user regulates fuel spray hydrogen pulsewidth in allowed limits, and this allowed band for example is that 2ms is to tens ms.Two other parameter can arbitrarily be provided with.
The controlled variable that ECU is provided with according to crankshaft signal, cam signal and user is obtained load running control signal and the operation of control load unit.
Each cylinder spray hydrogen signal is introduced oscillograph.At the current spray hydrogen pulsewidth of each adjusting, measure the spray hydrogen signal rising edge of each cylinder and the interval of negative edge and be spray hydrogen pulse width measure value, this measured value and current spray hydrogen pulsewidth are compared, if the two consistent ECU that illustrates moves normally.
When carrying out the test of a certain road spray hydrogen signal, when rigidly connecting into hydrogen spraying valve, valve may not spray.This may be the problem of valve, also may be the problem of ECU.At this moment, should give the very big spray hydrogen pulsewidth of hydrogen spraying valve, activate hydrogen spraying valve.If valve does not also spray, valve is inserted other road spray hydrogen signals, if the hydrogen spraying valve normal injection illustrates that ECU has problem.
(d) spray hydrogen angle of advance test
The ignition advance angle test comprises following 4 test events:
ECU obtains load running control signal and the operation of control load unit according to crankshaft signal, cam signal and default controlled variable; Wherein, the injection advance angle in the controlled variable is 360 °.
The spray hydrogen signal of each cylinder and the cam signal of signal imitation unit output are introduced oscillograph.Introducing oscillographic spray hydrogen signal can be that the preceding signal of conversion also can be the signal after the conversion.If in the spray hydrogen signal rising edge of each cylinder and the cam signal corresponding negative edge be spaced apart 360 °, determine that then the ECU operation is normal.
Test 2, watchdog routine are set to driving states, make signal imitation unit controls software that rotating speed is promoted to 800rpm from 200rpm, and the signal imitation unit is to the crankshaft signal and the cam signal of ECU output speed 800rpm correspondence.
ECU obtains load running control signal and the operation of control load unit according to crankshaft signal, cam signal and default controlled variable.Wherein, the injection advance angle in the controlled variable is 360 °.
The spray hydrogen signal of each cylinder and the cam signal of signal imitation unit output are introduced oscillograph.If in the spray hydrogen signal rising edge of each cylinder and the cam signal corresponding negative edge be spaced apart 360 °, determine that then the ECU operation is normal.
Test 3, watchdog routine are set to the demarcation state, make signal imitation unit controls software that rotating speed is reduced to 800rpm from being higher than 800rpm, and the signal imitation unit is to the crankshaft signal and the cam signal of ECU output speed 800rpm correspondence.
The user is sprayed the hydrogen angle of advance by monitoring unit and is set to 330 °.Two other parameter can arbitrarily be provided with.The controlled variable that ECU is provided with according to crankshaft signal, cam signal and user is obtained load running control signal and the operation of control load unit.
The spray hydrogen signal of each cylinder and the cam signal of signal imitation unit output are introduced oscillograph.If in the spray hydrogen signal rising edge of each cylinder and the cam signal corresponding negative edge be spaced apart 330 °, determine that then the ECU operation is normal.
Test 4, watchdog routine is set to the demarcation state, and is one or more gears in the middle of 1000～6000rpm with signal imitation unit controls software setting, exports corresponding crankshaft signal and cam signal to ECU on each rotating speed shelves.
The user is sprayed the hydrogen angle of advance by monitoring unit and is set to 330 °.Two other parameter can arbitrarily be provided with.The controlled variable that ECU is provided with according to crankshaft signal, cam signal and user is obtained load running control signal and the operation of control load unit.
The spray hydrogen signal of each cylinder and the cam signal of signal imitation unit output are introduced oscillograph.At each rotating speed shelves, if in the spray hydrogen signal rising edge of each cylinder and the cam signal corresponding negative edge be spaced apart 330 °, determine that then the ECU operation is normal.
(e) throttle opening test
Watchdog routine is set to the demarcation state, with a plurality of rotating speed shelves of signal imitation unit controls software set between 800～6000 rev/mins, then the signal imitation unit is exported the crankshaft signal and the cam signal of a plurality of rotating speed shelves correspondences between 800～6000rpm successively to ECU successively.
At each gear, the user is provided with throttle opening by monitoring unit (0-100%) in allowed band.At each throttle opening value, whether the actual throttle opening of observing load unit is consistent with setting value.If setting value is consistent with throttle opening, illustrate that the ECU operation is normal.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the test macro of an electronic control unit of automobile engine is characterized in that, this test macro comprises signal imitation unit, ECU (Electrical Control Unit), monitoring unit and load unit;
Described signal imitation unit is connected with described ECU (Electrical Control Unit) by engine wiring harness, is used for the rotating speed according to the outside input, and crankshaft signal and the cam signal that produces during the simulated engine running also sends to ECU (Electrical Control Unit);
Described ECU (Electrical Control Unit) is connected with described load unit, monitoring unit and signal imitation unit, under driving states, obtains the load running control signal and sends it to load unit according to crankshaft signal, cam signal and predetermined controlled variable; Under the demarcation state, obtain the load running control signal and send it to load unit by the controlled variable of monitoring unit input according to crankshaft signal, cam signal and user;
Described load unit is actual engine components, is connected with ECU (Electrical Control Unit) by engine wiring harness, and the load running control signal that is used for sending according to described ECU (Electrical Control Unit) is carried out action;
Described monitoring unit is used to monitor the state of ECU (Electrical Control Unit) and load unit; Controlled variable with user's input under the demarcation state sends to ECU (Electrical Control Unit).
2. electronic control unit of automobile engine test macro as claimed in claim 1 is characterized in that described load unit comprises fuel injection device, ignition coil, spark plug and electronic throttle;
Described load running control signal comprises fuel injection signal, ignition signal; Under the demarcation state, this load running control signal further comprises the throttle opening signal.
3. electronic control unit of automobile engine test macro as claimed in claim 1, it is characterized in that, described monitoring unit is reached at the ECU (Electrical Control Unit) watchdog routine of this test macro establishment by oscillograph, personal computer to be formed, and watchdog routine is used to monitor and control the running status of ECU (Electrical Control Unit); Oscillograph is connected to engine wiring harness between ECU (Electrical Control Unit) and the load unit by the electric current clamp; Personal computer links to each other with ECU (Electrical Control Unit) by communication line.
4. the method for testing of an electronic control unit of automobile engine is characterized in that, this method of testing is applied to comprise as any described test macro of claim 1 to 3; This method may further comprise the steps:
The crankshaft signal and the cam signal that produce during signal imitation unit simulation engine running;
Monitoring unit need be set in driving states or demarcation state by test;
When monitoring unit was in driving states, ECU (Electrical Control Unit) was obtained the load running control signal according to crankshaft signal, cam signal and predetermined controlled variable that described signal imitation unit produces; Load unit is carried out action by described load running control signal; Monitoring unit shows described cam signal and described load running control signal;
When monitoring unit was in the demarcation state, the controlled variable that crankshaft signal, cam signal and the user that ECU (Electrical Control Unit) produces according to described signal imitation unit imports by monitoring unit was obtained the load running control signal; Load unit is carried out action by described load running control signal; Monitoring unit shows described cam signal, controlled variable and described load running control signal;
Judge whether operate as normal of ECU (Electrical Control Unit) according to data presented in the monitoring unit.
5. the method for testing of a kind of electronic control unit of automobile engine as claimed in claim 4, it is characterized in that, when described monitoring unit is in driving states, crankshaft signal, cam signal and predetermined controlled variable that ECU (Electrical Control Unit) produces according to described signal imitation unit, obtain the load running control signal, comprising:
1. ECU (Electrical Control Unit) is calculated the present engine rotating speed according to the crankshaft signal of signal imitation unit simulation;
2. table look-up with the throttle opening that sets in advance according to the present engine rotating speed that calculates and obtain corresponding fuel injection pulsewidth and ignition advance angle;
3. determine the zero hour of lighting a fire according to cam signal that receives and ignition advance angle, determine that according to cam signal that receives and the fuel injection advance angle that sets in advance the fuel injection beginning constantly;
4. generate ignition signal the zero hour according to igniting, the based on fuel injection beginning constantly and fuel injection pulsewidth generation fuel injection signal, with fuel injection signal and ignition signal as the load running control signal;
When described monitoring unit was in the demarcation state, the controlled variable that crankshaft signal, cam signal and the user that ECU (Electrical Control Unit) produces according to described signal imitation unit imports by monitoring unit was obtained the load running control signal, comprising:
1. ECU (Electrical Control Unit) is determined the zero hour of lighting a fire according to the user by the ignition advance angle of monitoring unit input and the cam signal of signal imitation unit simulation, determines that according to fuel injection advance angle that sets in advance and described cam signal the fuel injection beginning constantly;
2. generate ignition signal the zero hour according to lighting a fire, the based on fuel injection beginning constantly and the fuel injection pulsewidth of user by monitoring unit control generate fuel injection signal, the throttle opening signal that the ignition signal of the fuel injection signal that generates, generation and user are controlled by monitoring unit is as the load running control signal.
6. the method for testing of a kind of electronic control unit of automobile engine as claimed in claim 4 is characterized in that, when adopting this method of testing that engine electric-controlled unit is carried out the ignition advance angle test, carries out following 4 tests:
Test 1, monitoring unit are set to driving states; Described signal imitation unit is to the crankshaft signal and the cam signal of ECU (Electrical Control Unit) output speed 200rpm correspondence; ECU (Electrical Control Unit) is obtained load running control signal and the operation of control load unit according to crankshaft signal, cam signal and default controlled variable;
Monitoring unit shows the ignition signal of each cylinder in the cam signal of described signal imitation unit output and the load running control signal; If corresponding falling edge is in synchronization in the ignition signal rising edge of each cylinder and the cam signal, determine that then the ECU (Electrical Control Unit) operation is normal;
Test 2, monitoring unit are set to driving states; Described signal imitation unit is promoted to 800rpm with rotating speed from 200rpm, to the crankshaft signal and the cam signal of ECU (Electrical Control Unit) output speed 800rpm correspondence; ECU (Electrical Control Unit) is obtained load running control signal and the operation of control load unit according to crankshaft signal, cam signal and default controlled variable;
Monitoring unit shows the ignition signal of each cylinder in the cam signal of described signal imitation unit output and the load running control signal; If corresponding falling edge is in synchronization in the ignition signal rising edge of each cylinder and the cam signal, determine that then the ECU (Electrical Control Unit) operation is normal;
Test 3, monitoring unit are set to the demarcation state; Described signal imitation unit is reduced to 800rpm with rotating speed from being higher than 800rpm, to the crankshaft signal and the cam signal of ECU (Electrical Control Unit) output speed 800rpm correspondence; The user regulates ignition advance angle by monitoring unit in the allowed band of ignition advance angle; The controlled variable that ECU (Electrical Control Unit) is regulated according to crankshaft signal, cam signal and user is obtained load running control signal and the operation of control load unit;
Monitoring unit shows the ignition signal of each cylinder in the cam signal of described signal imitation unit output and the load running control signal; At the ignition advance angle of each adjusting, if the ignition advance angle that is spaced apart user's adjusting of corresponding negative edge in the ignition signal negative edge of each cylinder and the cam signal determines that then the ECU (Electrical Control Unit) operation is normal;
Test 4, monitoring unit are set to the demarcation state; Described signal imitation unit is the crankshaft signal and the cam signal of one or more rotating speed shelves correspondences in the middle of ECU (Electrical Control Unit) output 1000～6000rpm successively;
On each rotating speed shelves, the user regulates ignition advance angle by monitoring unit in the allowed band of ignition advance angle; The controlled variable that ECU (Electrical Control Unit) is regulated according to crankshaft signal, cam signal and user is obtained load running control signal and the operation of control load unit;
Monitoring unit shows the ignition signal of each cylinder in the cam signal of described signal imitation unit output and the load running control signal; At the ignition advance angle of each adjusting in each rotating speed shelves, if the ignition advance angle that is spaced apart user's adjusting of corresponding negative edge in the ignition signal negative edge of each cylinder and the cam signal determines that then the ECU (Electrical Control Unit) operation is normal.
7. the method for testing of a kind of electronic control unit of automobile engine as claimed in claim 4 is characterized in that, adopts this method of testing that engine electric-controlled unit is carried out the fuel injection pulsewidth test;
Monitoring unit is set to the demarcation state; Described signal imitation unit is the crankshaft signal and the cam signal of one or more rotating speed shelves correspondences in the middle of ECU (Electrical Control Unit) output 800～6000rpm successively; On each rotating speed shelves, the user is by monitoring unit fuel metering injection pulse width in allowed band; The controlled variable that ECU (Electrical Control Unit) is regulated according to crankshaft signal, cam signal and user is obtained load running control signal and the operation of control load unit;
Monitoring unit shows that ECU (Electrical Control Unit) sends to the fuel injection signal of each cylinder of load unit; At the fuel injection pulsewidth of each adjusting in each rotating speed shelves,, determine that then the ECU (Electrical Control Unit) operation is normal if the fuel injection pulsewidth of each cylinder is identical with the fuel injection pulsewidth that the user regulates.
8. the method for testing of a kind of electronic control unit of automobile engine as claimed in claim 4 is characterized in that, when adopting this method of testing that engine electric-controlled unit is carried out the injection advance angle test, carries out following 4 tests:
Test 1, monitoring unit are set to driving states; Described signal imitation unit is to the crankshaft signal and the cam signal of ECU (Electrical Control Unit) output speed 200rpm correspondence; ECU (Electrical Control Unit) is obtained load running control signal and the operation of control load unit according to crankshaft signal, cam signal and default controlled variable; Wherein, the injection advance angle in the controlled variable is 360 °;
Monitoring unit shows the fuel injection signal of each cylinder in the cam signal of described signal imitation unit output and the load running control signal; If in the fuel injection signal rising edge of each cylinder and the cam signal corresponding negative edge be spaced apart 360 °, determine that then the ECU (Electrical Control Unit) operation is normal;
Test 2, monitoring unit are set to driving states; Described signal imitation unit is promoted to 800rpm with rotating speed from 200rpm, to the crankshaft signal and the cam signal of ECU (Electrical Control Unit) output speed 800rpm correspondence; ECU (Electrical Control Unit) is obtained load running control signal and the operation of control load unit according to crankshaft signal, cam signal and default controlled variable; Wherein, the injection advance angle in the controlled variable is 360 °;
Monitoring unit shows the fuel injection signal of each cylinder in the cam signal of described signal imitation unit output and the load running control signal; If in the fuel injection signal rising edge of each cylinder and the cam signal corresponding negative edge be spaced apart 360 °, determine that then the ECU (Electrical Control Unit) operation is normal;
Test 3, monitoring unit are set to the demarcation state; Described signal imitation unit is reduced to 800rpm with rotating speed from being higher than 800rpm, to the crankshaft signal and the cam signal of ECU (Electrical Control Unit) output speed 800rpm correspondence; The user is set to 330 ° by the monitoring unit injection advance angle; The controlled variable that ECU (Electrical Control Unit) is regulated according to crankshaft signal, cam signal and user is obtained load running control signal and the operation of control load unit;
Monitoring unit shows the fuel injection signal of each cylinder in the cam signal of described signal imitation unit output and the load running control signal; If in the fuel injection signal rising edge of each cylinder and the cam signal corresponding negative edge be spaced apart 330 °, determine that then the ECU (Electrical Control Unit) operation is normal;
Test 4, monitoring unit are set to the demarcation state; Described signal imitation unit is the crankshaft signal and the cam signal of one or more rotating speed shelves correspondences in the middle of ECU (Electrical Control Unit) output 1000～6000rpm successively; On each rotating speed shelves, the user is set to 330 ° by the monitoring unit injection advance angle, and the controlled variable that ECU (Electrical Control Unit) is regulated according to crankshaft signal, cam signal and user is obtained load running control signal and the operation of control load unit;
Monitoring unit shows the fuel injection signal of each cylinder in the cam signal of described signal imitation unit output and the load running control signal; At each rotating speed shelves, if in the fuel injection signal rising edge of each cylinder and the cam signal corresponding negative edge be spaced apart 330 °, determine that then the ECU (Electrical Control Unit) operation is normal.
9. the method for testing of a kind of electronic control unit of automobile engine as claimed in claim 4 is characterized in that, when adopting this method of testing that engine electric-controlled unit is carried out the engine speed test, monitoring unit is set in the demarcation state;
Described signal imitation unit is to the crankshaft signal and the cam signal of ECU (Electrical Control Unit) output one default engine speed value correspondence; ECU (Electrical Control Unit) is calculated tachometer value and is sent to monitoring unit according to crankshaft signal and shows; Whether the tachometer value that shows in the observation monitoring unit and the difference of described default engine speed value be less than default thresholding, if determine that then the ECU (Electrical Control Unit) operation is normal.
10. the method for testing of a kind of electronic control unit of automobile engine as claimed in claim 4 is characterized in that, when adopting this method of testing that engine electric-controlled unit is carried out the throttle opening test, monitoring unit is set in the demarcation state;
The signal imitation unit is the crankshaft signal and the cam signal of a plurality of rotating speed shelves correspondences between ECU (Electrical Control Unit) output 800～6000rpm successively; On each rotating speed shelves, the user regulates throttle opening in allowed limits by monitoring unit; At the throttle opening of each adjusting,, determine that then the ECU (Electrical Control Unit) operation is normal if the actual throttle opening of load unit is consistent with the throttle opening that the user regulates.
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| CN103913995A (en) * | 2014-03-25 | 2014-07-09 | 潍柴动力股份有限公司 | Method and device for simulation of ECU hardware-in-loop of engine in air cylinders |
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| CN101871843A (en) * | 2010-05-31 | 2010-10-27 | 浙江大学 | Crankshaft and camshaft analog signal generating method and device thereof |
| CN101871843B (en) * | 2010-05-31 | 2012-02-01 | 浙江大学 | Crankshaft and camshaft analog signal generating method and device thereof |
| CN102566561A (en) * | 2010-12-24 | 2012-07-11 | 上海工程技术大学 | Method and device for diagnosing automotive electronic control unit faults based on semi-physical simulation |
| CN102566561B (en) * | 2010-12-24 | 2014-08-06 | 上海工程技术大学 | Method and device for diagnosing automotive electronic control unit faults based on semi-physical simulation |
| CN102681538A (en) * | 2012-05-31 | 2012-09-19 | 杭州速玛科技有限公司 | Test system and test method for ECU oil injection and ignition control |
| CN103913995A (en) * | 2014-03-25 | 2014-07-09 | 潍柴动力股份有限公司 | Method and device for simulation of ECU hardware-in-loop of engine in air cylinders |
| CN104111174A (en) * | 2014-08-06 | 2014-10-22 | 北京理工大学 | Rotating speed simulation device based on phase of vehicle engine |
| CN104111174B (en) * | 2014-08-06 | 2016-08-17 | 北京理工大学 | Rotating speed analog based on vehicular engine phase place |
| CN106054851A (en) * | 2015-04-15 | 2016-10-26 | 帝斯贝思数字信号处理和控制工程有限公司 | Method and system for testing a mechatronic system |
| CN106556517A (en) * | 2015-09-25 | 2017-04-05 | 北京因极技术有限公司 | Multifunction electro-controlled explosive motor trouble-shooter |
| CN107065818A (en) * | 2016-12-28 | 2017-08-18 | 海特汽车科技（苏州）有限公司 | A kind of EPS controllers diagnostic equipment |
| CN107340122A (en) * | 2017-06-19 | 2017-11-10 | 桂林福达曲轴有限公司 | A kind of sizer measures inaccurate failure problems analysis with solving method |
| CN109991439A (en) * | 2019-04-24 | 2019-07-09 | 苏州科美澄汽车科技有限公司 | A kind of device of electric card pincers motor speed measurement and corresponding control method |
| CN110486207A (en) * | 2019-09-29 | 2019-11-22 | 潍柴西港新能源动力有限公司 | A kind of method and system that ignition failure detects automatically |
| CN110486207B (en) * | 2019-09-29 | 2021-05-18 | 潍柴西港新能源动力有限公司 | Method and system for automatically detecting ignition system fault |
| FR3104359A1 (en) | 2019-12-05 | 2021-06-11 | Psa Automobiles Sa | SERIAL AND / OR PARALLEL TEST DEVICE OF DISPLAY COMMUNICATING EQUIPMENT |
| CN111665739A (en) * | 2020-06-04 | 2020-09-15 | 苏州国方汽车电子有限公司 | National six diesel engine digital calibration system |
| CN112711243A (en) * | 2020-12-17 | 2021-04-27 | 一汽解放汽车有限公司 | Engine electronic control unit testing device and system |
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