| 摘要 |
PURPOSE:To constrain the fluctuation of air fuel ratio of an engine in its transient run, by providing two throttle valves in a throttle chamber, controlling one throttle valve depending on the running condition of the engine, and controlling the other through an accelerator pedal. CONSTITUTION:In a controller, throttle valves TH1, TH2 with the same diameter are juxtaposed so that one throttle valve TH1 is opened and closed through an accelerator pedal 8 and a rod 21 and the other TH2 is opened and closed by a throttle actuator 4. The degrees of opening of the throttle valves TH1, TH2 are detected by sensors 9, 16. The actuator 4 is controlled so that the sum of the degrees thetaTH2, thetaTH1 of opening of the throttle valves TH2, TH1 is equal to the degree thetaAC of opening of the accelerator pedal 8. As a result, drawbacks including a phenomenon that the ratio of fuel to air instantaneously drops in a transient run such as acceleration are eliminated so that the running property is improved. |
