Study On Testing Technology And Platform For Engine Management System Development

The test procedure of Engine Management System (EMS) is important for higher reliability, and the research and development of EMS have the profound and great influence on entire vehicles and power industry, though steps and ways of EMS development and design are complex. A series of testing technologies for EMS development is described in this dissertation. These descriptions include the analysis of the history and present situation of the research of EMS and its development platform, and involve the analysis of the function and component of EMS with a common configure, and embrace the establishment of testing platform for development of EMS.The testing platform can observe, gage and infer the EMS components, which consist of temperature sensors, pressure sensors, throttle position sensor, rotate speed sensor, angle position sensor, exhaust gas oxygen sensor, knock sensor, electronic control unit (ECU), signal solenoid actuator, electric motor, stepper motor, and so on. The platform can also determine, predict, estimate, and review the EMS functions, which are comprised of air suction management, fuel injection management, spark ignition management, idle speed management, malfunction management, and so forth. Some results of investigation and review can be obtained in the conditions of real vehicle testing, and can be also produced from the simulation of hardware-in-loop (HIL) of ECU.The simulating test settings comprised the real time engine model based on the average value theories and the real time vehicle model based on the conversation of energy laws. The average value theories are modified and introduced into engine model for the real time application, and put together the model of pulse and phase calculating of fuel injection, the model of calculating of fuel aviation, the model of calculating of fuel atomization and volatilization, the model of the air suction calculation based on either throttle open degrees or intake pressure or air flow, the model of calculating of the air and fuel ratio in a cylinder, the model of estimating of the fire and knock, the model of signal simulating generation of oxygen sensor, and the model of the calculation of combustion work and power generation, that comprised the real time engine model. The deducing step and analytic procedure of conversation of energy of vehicle are revealed for calculating engine revolving speed in vehicle model which include road work calculation model, brake work calculation model, vehicle speed and engine revolving speed calculation model.This dissertation demonstrates the experimental results of simulating motorcycle after the parameters of simulating engine on the basis of CG125 and relevant vehicle on the basis of QJ125 are ascertained. According as a testing demand of the development of EMS from FAI, the issue on speed fluctuation of single cylinder engine is investigated, and simulation signal of the crankshaft angle sensor characterized by speed fluctuation is deduced and generated, and then a series of testing experiments employing many electronic control units (ECUs) from FAI is acted. The testing results indicate that simulation CG125 engine and QJ125 motorcycle model can meet the test requirements of the development of EMS of CG125 engine. By the way of parameter verification of simulating engine and vehicle, the real-time models of other types of motor vehicles and engines can be fetched, and these models can be used in the test and development of the corresponding EMS. The testing platform described in this paper for development of EMS can be use for finding out some data maps of real fuel injecting phase, fuel injecting pulse width, ignition phase of any engine with one cylinder to four cylinders under a variety of operating conditions and modes. These modes include different engine temperature, different air temperature, different air pressure, different voltage of battery, different engine rotate speed, different engine load, and so on. Furthermore, the corrections of data maps in the conditions of different battery voltage, different atmospheric pressure, and different ambient temperature, can be calculated, and Control Strategy of EMS can be researched and evaluated.