| 摘要 |
PURPOSE:To prevent overheat, by decreasing a reference amount to a small value and changing air-fuel ratio into a rich state by an open loop control when a room cooler is actuated, in the case of an engine which stops a feedback control of the air-fuel ratio when the engine is in high load operation with a supply amount of fuel exceeding the reference amount. CONSTITUTION:A control circuit 20, which calculates the basic fuel injection quantity on the basis of detection values from an intake absolute pressure sensor 11 and a crank angle sensor 13, performs various corrections on the basis of detection values of a throttle opening sensor 10, cooling water temperature sensor 12, O2 sensor 14, atmospheric pressure sensor 16, etc. An engine, when it is in high load operation with a fuel injection quantity exceeding the reference value, stops a feedback control of air-fuel ratio on the basis of the O2 sensor 14 performing an open loop control, but when a cooling water temperature is in a predetermined value or more further with a room cooling action detecting switch 17 detecting an air conditioning unit in operation, the engine, decreasing the reference amount to a small value, early controls the air-fuel ratio to a rich state.
|
