| 摘要 |
PURPOSE:To enable the fine control for the idle rotation by operating either of an air control valve or a fuel supply control means in accordance with the difference between the target and the actual values of the idle rotation. CONSTITUTION:An atmospheric conduit 12 and a negative pressure conduit 13 conducting to the pressure operation chamber 10 of an actuator 8 for driving the throttle valve 3 of a suction conduit section 2 are provided while the solenoid valves 14, 15 are provided, then the valves 14, 15 and the fuel injector are controlled by means of a computer 16 which receives each informations D1-D5 from an idle detector 17, water temperature sensor 18, air conditioner drive switch 19, engine rotation detector 20 and an air flow sensor 6. When the difference D between the target and the actual values of the idle rotation operated by the computer on the basis of the informations D1-D5 exceeds over the referential level Dset, only the valves 14, 15 are controlled while when the difference (D) will not exceed over Dset only the device 7 is controlled to realize the optimal air-fuel ratio. |
