Fuzzy Control Simulation of Air/Fuel Ratio of Gasoline Engine

In this study, the simulator of a gasoline engine is built, and the fuzzy theory is applied to the air/fuel ratio controller. The gasoline engine simulator is made of simple mathematical equations and torque map. The simulator consists of three parts : intake, combustion and mechanical load. The intake part had a first-order lag. The combustion part is mapped from the data based on the engine torque test. The mechanical load part is described by a differential equation. The fuzzy controller is designed to keep the air/fuel ratio constant. The controller has two fuzzy rule tables made by considering the nonlinear characteristics of the oxygen sensor. Experimental results show that the engine system with fuzzy controller has good responses from the viewpoints of engine speed and torque control