| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform appropriate air/fuel ratio feedback control for the state of a system, and prevent emission deterioration. <P>SOLUTION: An engine control system selectively switches between first and second fuels, and performs driving control for a single engine. The engine control system has an air-fuel ratio sensor arranged in an exhaust system of the engine, and a controller which calculates a feedback correction coefficient necessary for air/fuel ratio feedback control based on an output signal from the air/fuel ratio sensor when driving the engine using each fuel and stores the feedback correction coefficient in a non-volatile memory as a learning value. During driving using one fuel, if the engine driving state is a forced learning driving state using the other fuel, the controller switches the driving to engine driving using the other fuel. <P>COPYRIGHT: (C)2012,JPO&INPIT |
