CN103631256A - Engine signal simulation test bench and method of testing ECU (electronic control unit) therebof - Google Patents
Engine signal simulation test bench and method of testing ECU (electronic control unit) therebof Download PDFInfo
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- CN103631256A CN103631256A CN201310644160.5A CN201310644160A CN103631256A CN 103631256 A CN103631256 A CN 103631256A CN 201310644160 A CN201310644160 A CN 201310644160A CN 103631256 A CN103631256 A CN 103631256A
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Abstract
The invention discloses an engine signal simulation test bench and a method of testing an ECU (electronic control unit) thereof. The engine signal simulation test bench comprises an upper computer and a lower computer. The lower computer comprises a MCU (microcontroller unit), a digital-analog conversion circuit and an analog-digital conversion circuit. The digital-analog conversion circuit comprises an analog signal generator, a crankshaft, a cam signal generator, and a switch signal generator. The analog-digital conversion circuit is used for capturing oil injection signals fed back from the ECU. The method includes: allowing the upper computer to control the lower computer to send out a signal to the ECU, allowing the lower computer to capture an oil injection signal fed back from the ECU to acquire oil injection pulsewidth, and calculating cam speed and crankshaft speed and other engine real-time status data which are sent to the upper computer for displaying, and allowing the lower computer to re-transmit the data to the ECU in the same time. The engine signal simulation test bench is high in reliability, simple, universal, and low in test cost, and allows a control strategy of the ECU to be quickly and conveniently tested to find out whether the strategy is effective in controlling oil injection of a fuel oil system or not, so that ECU strategies can be verified more efficiently.
Description
Technical field
The present invention relates to the method for engine signal analog simulation test board and test ECU thereof a kind of.
Background technology
Electronic Control Technology in Diesel Engines is one of effective technical way improving engine fuel economy, dynamic property and emission behavior.Diesel engine electric control unit (ECU) is the core of diesel engine electric control system.ECU in the course of the work, by gathering the signal of each sensors such as engine water temperature, engine speed, thereby calculates current controlled quentity controlled variable, and controls the control that corresponding driver has carried out coupled engines.
In the performance history of ECU, need to be necessary the equipment that provides such, the control strategy of ECU inside is verified, and offer testing crew by the operation interface of host computer, make its intuitively and accurately decision plan whether have problems, thereby revise nominal data.
Summary of the invention
A kind of method that the object of this invention is to provide engine signal analog simulation test board and test ECU thereof, described engine signal analog simulation test board reliability is high, simple general-purpose, experimentation cost are low, and whether the control strategy that can conveniently test ECU can effectively control the injection oil mass of fuel system.
For achieving the above object, the present invention adopts following technical scheme:
An engine signal analog simulation test board, comprises the host computer and the slave computer that for the ECU with needs test, are connected respectively; Described slave computer comprises MCU and the D/A converting circuit being connected with MCU respectively and the analog to digital conversion circuit being connected with host computer; Described D/A converting circuit comprises analog signal generator, bent axle and cam signal generator and the switch signal generator for being connected with ECU; Analog-digital conversion circuit as described is the fuel injection pulsewidth signal catching circuits for being connected with ECU.
Further, between described host computer and slave computer, by serial ports, be connected.
Further, described MCU adopts STM32.
Apply the method for above-mentioned engine signal analog simulation testing board ECU, comprise the following steps: (1) in host computer, inputs engine oil temperature, water temperature, bent axle and cam rotating speed and other status datas send to slave computer, slave computer is become these data-switching simulating signal and switching signal and is sent to ECU with switch signal generator by analog signal generator, bent axle and cam signal generator; (2) ECU feedback output fuel injection signal, slave computer obtains fuel injection pulsewidth by analog to digital conversion circuit, and further calculate bent axle and cam rotating speed and other engine real-time status data, described bent axle and cam rotating speed and other engine real-time status data are sent to host computer, and the while is again converted to simulating signal by slave computer and switching signal sends to ECU; (3) repeating step (2); (4) judge that whether described bent axle and cam rotating speed and other engine real-time status data are stable.
Owing to adopting technique scheme, the present invention at least has the following advantages:
Engine signal analog simulation test board of the present invention can analog switch signal, simulating signal, possess the features such as reliability is high, simple to operate, experimentation cost is low, by revising nominal data, just can adapt to the checking of various diesel engine ECU control strategy, it is the electric injection system test board that a versatility is very strong, not only can be used for unit-pump system, also can be used for high pressure co-rail system.Apply engine signal analog simulation test board of the present invention and can conveniently test the injection the oil mass whether control strategy of ECU can effectively control fuel system, the efficiency that improves ECU policy validation, contributes to ECU strategy Development personnel to analyze the working condition of ECU.
Accompanying drawing explanation
Above-mentioned is only the general introduction of technical solution of the present invention, and in order to better understand technological means of the present invention, below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Fig. 1 is engine signal analog simulation test board structural representation of the present invention.
Fig. 2 is engine signal analog simulation test board functional schematic of the present invention.
Fig. 3 is engine signal analog simulation testing board schematic diagram of the present invention.
Embodiment
A kind of engine signal analog simulation test board of the present invention is the electric injection system test board that a versatility is very strong, not only can be used for unit-pump system, also can be used for high pressure co-rail system.This test board just can adapt to the checking of various diesel engine ECU control strategy by revising nominal data.
As Figure 1-3, a kind of engine signal analog simulation test board, comprises the host computer and the slave computer that for the ECU with needs test, are connected respectively; Described slave computer comprises MCU and the D/A converting circuit being connected with MCU respectively and the analog to digital conversion circuit being connected with host computer; Described D/A converting circuit comprises analog signal generator, bent axle and cam signal generator and the switch signal generator for being connected with ECU; Analog-digital conversion circuit as described is the fuel injection pulsewidth signal catching circuits for being connected with ECU.
Host computer and slave computer communicate, and communication mode can select serial ports to connect, because serial ports is easy to exploitation and cost is low, by serial port protocol, just can realize the communication between host computer and slave computer, carry out the exchange of data.
Equipment on slave computer mainly can be divided into two classes, and a class is input equipment, and a class is output device, is all to be directly connected on the IO mouth of multipoint control unit MCU, and input equipment directly feeds back to MCU the signal collecting, and by MCU, is processed.Output device is that the PWM ripple that MCU is generated is changed, and produces output signal.In addition, on slave computer, be also provided with LCD module.MCU can adopt STM32, by the systemic-function of engine signal analog simulation test board, usable range are analyzed, the function that while determining practical application, this test board will be realized, according to the major function adjustment use STM32 of test board and the technical scheme of C Programming with Pascal Language.
The engine signal analog simulation test board of the present embodiment at least has following major function:
1) output switching signal.
2) outputting analog signal amount.
3) fuel injection pulsewidth of fuel system is caught, calculate the rotating speed of bent axle and cam.
4) carry out onlinely with PC host computer, by serial communication protocol, communicate and exchanges data.
5) by the operation interface on host computer, slave computer is arranged, control the signals such as oil temperature water temperature.
The method of application engine analog simulation testing board ECU, comprise the following steps: (1) in host computer, inputs engine oil temperature, water temperature, bent axle and cam rotating speed and other status datas send to slave computer, slave computer is become these data-switching simulating signal and switching signal and is sent to ECU with switch signal generator by analog signal generator, bent axle and cam signal generator; (2) ECU feedback output fuel injection signal, slave computer obtains fuel injection pulsewidth by analog to digital conversion circuit, and further calculate bent axle and cam rotating speed and other engine real-time status data, described bent axle and cam rotating speed and other engine real-time status data are sent to host computer, and the while is again converted to simulating signal by slave computer and switching signal sends to ECU; (3) repeating step (2); (4) judge that whether described bent axle and cam rotating speed and other engine real-time status data are stable.
As shown in Figure 3, apply engine signal analog simulation test board of the present invention, it is connected with needing the ECU of test, form engine signal analog simulation test macro.Engine signal analog simulation test board manually arranges engine related data by the operation interface on host computer, slave computer (comprises oil temperature according to these digital simulation multiple sensor signal outputs, water temperature, bent axle and cam signal), ECU connects slave computer to be tested, the operation conditions of test macro simulated engine, slave computer is analog to digital conversion circuit by signal capture circuit, catch the fuel injection pulsewidth of fuel injection system, slave computer calculates bent axle and cam rotating speed according to fuel injection pulsewidth, simultaneously according to the test figure of the configuration parameter of engine and engine, the corresponding data such as oil temperature and water temperature that obtain, these data will send to host computer by serial ports on the one hand, on host computer interface, show, to send in ECU on the one hand, ECU obtains after these data, generate a fuel injection pulsewidth, this forms the closed loop of a control, if system is stable, fuel injection pulsewidth will be stabilized in a numerical value.
During test, host computer is controlled the simulating signal of slave computer output by serial ports, open car key switch, regulate accelerator pedal signal and rail pressure signal, for example, keep the constant of rail pressure, constantly change the numerical value of accelerator pedal signal, ECU feedback output fuel injection signal, engine signal analog simulation test board catches fuel injection pulsewidth, calculates bent axle and cam rotating speed, in host computer interface display.
The above; it is only preferred embodiment of the present invention; not the present invention is done to any pro forma restriction, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection scope of the present invention.
Claims (4)
1. an engine signal analog simulation test board, is characterized in that, comprises the host computer and the slave computer that for the ECU with needs test, are connected respectively;
Described slave computer comprises MCU and the D/A converting circuit being connected with MCU respectively and the analog to digital conversion circuit being connected with host computer;
Described D/A converting circuit comprises analog signal generator, bent axle and cam signal generator and the switch signal generator for being connected with ECU;
Analog-digital conversion circuit as described is the fuel injection pulsewidth signal catching circuits for being connected with ECU.
2. engine signal analog simulation test board according to claim 1, is characterized in that, between described host computer and slave computer, by serial ports, is connected.
3. engine signal analog simulation test board according to claim 1, is characterized in that, described MCU adopts STM32.
4. the method for the engine signal analog simulation testing board ECU described in application rights requirement 1-3 any one, is characterized in that, comprises the following steps:
(1) in host computer, input engine oil temperature, water temperature, bent axle and cam rotating speed and other status datas and send to slave computer, slave computer is become these data-switching simulating signal and switching signal and is sent to ECU with switch signal generator by analog signal generator, bent axle and cam signal generator;
(2) ECU feedback output fuel injection signal, slave computer obtains fuel injection pulsewidth by analog to digital conversion circuit, and further calculate bent axle and cam rotating speed and other engine real-time status data, described bent axle and cam rotating speed and other engine real-time status data are sent to host computer, and the while is again converted to simulating signal by slave computer and switching signal sends to ECU;
(3) repeating step (2);
(4) judge that whether described bent axle and cam rotating speed and other engine real-time status data are stable.
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| CN104122090A (en) * | 2014-07-17 | 2014-10-29 | 白志平 | Automobile engine system diagnostic instrument |
| CN105319070A (en) * | 2014-07-17 | 2016-02-10 | 北京汽车动力总成有限公司 | Engine performance parameter test method and system with speed limitation protection |
| CN106681308A (en) * | 2017-01-26 | 2017-05-17 | 吴神培 | Method and system for detecting ECU (electronic control unit) of vehicle |
| CN107024926A (en) * | 2017-06-13 | 2017-08-08 | 安徽省爱夫卡电子科技有限公司 | The simulation system and its analogy method of a kind of automobile ECU |
| CN109443772A (en) * | 2018-11-02 | 2019-03-08 | 南京金城机械有限公司 | Electric spray signal testing cassete |
| CN111911306A (en) * | 2020-07-27 | 2020-11-10 | 山东飞奥航空发动机有限公司 | Test simulation system of unmanned aerial vehicle electronic injection system and implementation method thereof |
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| CN111911306A (en) * | 2020-07-27 | 2020-11-10 | 山东飞奥航空发动机有限公司 | Test simulation system of unmanned aerial vehicle electronic injection system and implementation method thereof |
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Effective date of registration: 20180719 Address after: 300000 2 Yulong Road, automobile industrial park, Wuqing District, Tianjin Patentee after: North oil electronic control fuel injection system (Tianjin) Co., Ltd. Address before: No. 3, Cheng Zhuang Road, Fengtai District, Beijing Patentee before: Beijing Yaxin Ketianwei Oil Pume Nozzle Tip Co., Ltd. |
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