| 摘要 |
<p>PURPOSE:To obtain constantly an appropriate air-fuel ratio by correcting the air-fuel ratio of air-fuel mixture according to the action state of an actuator for actuating a waste gate valve provided at a by-pass passage as an alternate passage for the turbine of a supercharger. CONSTITUTION:In a device for opening/closing the entrance 26 of a by-pass passage 24 provided as an alternate passage for the exhaust turbine 8 of a supercharger 4 by means of a waste gate valve 30 operated by an actuator 32, the actuator 32 is provided with a pressure chamber 38 and an air chamber 40 partitioned by a diaphragm 36 in its main body 34 and driven by the pressure, in an inlet passage on the downstream side of the supercharger 4, led into the pressure chamber 38 through a pressure leading passage 48. A pressure control valve 54 is connected to the pressure leading passage 48, and pressure adjustment is performed by leaking this pressure by the valve 54. In this case, the action state of the pressure control valve 54 is monitored, and a fuel injection valve is controlled by this action state which is made a control factor so as to correct the air-fuel ratio of air-fuel mixture.</p> |
