| 摘要 |
PURPOSE:To improve furl expense through controlling so as to make up for the shortage of an intake air quantity by performing operation, at least at a time of hot idling, in a state wherein an air fuel ratio is lean, and making the air fuel ratio rich when the number of revolution has lowered due to a load. CONSTITUTION:At a time of engine operation, it is first detected at a control circuit 24 whether an idling condition, according to the output of an idling switch 26, exists or not, and when the idling condition is detected, and air fuel ratio at a time of idling is set according to an engine temperature detected by a water temperature sensor 36. And a fuel supply quantity is figured out on the basis of the output of a pressure sensor 32 as well as the air fuel ratio set as aforesaid. Also, at this time, a target revolution-number at a time of idling is set on the basis of the output of the water temperature sensor 36, and at the same time the fuel supply quantity is corrected in accordance with a difference between this target revolution-number and the real revolution-number calculated on the basis of the output of a crank angle sensor 42, and this corrected fuel quantity is made to be injected out of a fuel injection valve 46.
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