Research On Measuring And Controlling System Of Engine Test Bed

Controlling methods, software and hardware of measuring and controlling system of engine test bed are designed. The measuring and controlling performance is researched from simulation and experiments.The engine is the most representative, complex system of multi-input, multi-output, nonlinearity, time-variation. After comparing the fuzzy control method and PID control method, Fuzzy-PID control method is presented based on the merits of both. The fuzzy-PID control theory is combined with the control principle of eddy current dynamometer and a basic fuzzy-PID controller is designed.This system takes Visual C++ 6.0 as the development platform, utilizing Object-Oriented Program to develop the software for test bed control. The software has many functions such as data collection of the engine and dynamometer, control parameters calculation and output of the dynamometer, curve processing etc. After the hardware and software are designed and dynamics of the test bed is analysted, the simulations are researched of rotate speed, torque, the opening of throttle of the engine, excitation current of the eddy current dynamometer and the realization of the system is demonstrated in theory.Software and hardware design of the engine test bed are introduced in details in this thesis. The development of the test bed is based on the PBD WC110 eddy current dynamometer. Taking PC as the core, the multifunction interface card, circuit and sensor are formed into a closed loop control system. The main function of the test bed is to control the rotate speed and torque of the engine, and to collect and process such performance parameters as temperature of the engine. It was proved through experiments that the better performances of the system in both dynamic and steady state.