LPG 엔진 모델링 및 ECM 설계에 관한 연구

Liquid Petroleum Gas(LPG) has been widely used for commercial light-duty vehicles worldwide. Since LPG has a higher octane number and a lower maximum combustion temperature than gasoline, it becomes more popular fuel for reducing exhaust emissions. In this study, mathematical models of air intake and fuel delivery system are presented, and a PI-controller is designed for air-fuel ratio control. Hardware and software of an engine control module(ECM) are designed for an LPG engine. The ECM is built using a Motorola MC68HC05. In order to control the air-fuel ratio at stoichiometry, the PI-control algorithm is implemented in the ECM. The experimental results show that the proto LPG ECM and its control scheme perform well to meet the stoichiometric air-fuel ratio requirement.