Studies Of The Electronic Control System In The Fuel Single Point Injection Engine

This paper describes the components in the common electronic control system of engine and presents the basic control theory and algorithm in the electronic control unit. To develop new-style engine ECU, the studies designed and fabricated an ECU measuring device to get the MAP data from foreign ECU. The ECU measuring device can not only detect the foreign ECU, but also be used to optimize the control parameters in the ECU developed. The PC gets the data from the ECU measuring device and stores them in the database, which can be used to write ECU's control program.In our studies, engine experiment is carried out. In this experiment, adjusting the throttle to the specific position, and letting engine rotary speed change from the lowest to the highest, at the same time, the data of the water temperature, the fuel temperature,the air press and the rotary speed can be noted. Moreover, we can measure the fuel quantity and the ignition angle. On the base of the data, the MAP of the steady state control can be constructed. The data not only become specimen for studying ECU control algorithm but also become reference for adjusting, measuring and verifying the measuring device.This paper also discusses SI engine idle speed control. The rotary speed stability of engine in idle speed state is analyzed and studied further by using fuzzy control theory, BP neural network and PID theory. The simulation results are given though fuzzy control compared with PID control. The BP neural network has been used to learn the relationship of input and output function in fuzzy control to replaced the fuzzy rule table. The advanced and efficient algorithm variable scale method for learning is used in BP neural network training. Finally the control simulation results are given.