| 摘要 |
PURPOSE:To stabilize an idle running immediately after an engine start by providing an engine having an automatic speed changing apparatus with an on-off valve for supplying auxiliary air and by opening the valve only during a given time just after the engine leaves the starting condition. CONSTITUTION:A main control valve 6 and an AT control valve 10 are provided as auxiliary air quantity control valves for supplying auxiliary air in an air changing system of an engine having an automatic speed changing apparatus. A control unit 9, with signals from various sensors inputted thereto, discriminates the starting condition when a starter switch 21 is ON and yet an engine speed Ne is smaller than a given start discriminating speed, and discriminates that the engine leaves a cranking condition when aforesaid conditions are not satisfied. During a given time starting from the instant when the engine leaves the cranking condition, the AT control valve 10 is opened to supply the auxiliary air, thereby enabling to stabilize an idle running immediately after the engine start. |
