Of Cg125 Motorcycle Engine Idle Speed Control

This paper is concerned with a method for engine idle improvement. It is well known that inappropriate idling control increases fuel consumption and pollutant emissions, and also compromises stability.In this paper, idle performance control is realized by changing the air-fuel rate through changing the bypass air mass which is controlled by stepper motor. Fuzzy control method has been used to study engine idle speed. This method has advantage in not making mathematical model for the controlled object. The proceedings of idle speed are so complex that it is very difficult to design a good controller based on the mathematical model of gasoline engine idling condition. In the system, this paper refers a MCS-89C5 1 single chip computer is taken as the controller, engine speed as the feedback signal. The hardware and software of the system, the method to control the stepper motor as an actuator have been discussed in detail in this paper.To prove the effectiveness of the control system, a comparison of idle performance respectively by the original carburator engine and the carburator with the control system. The results show that with the closed system to control the engine idle process, the idle running quality is greatly improved and the engine speed fluctuation is remarkably reduced. It proved that the control system is useful and effective for raising engine idle performance.