| 摘要 |
A system for reducing a driving torque of an engine employs a diaphragm type actuator for actuating a second throttle valve disposed in an intake passage of the engine in series to an accelerator-operated ordinary throttle valve in order to provide a simplified construction. A three way solenoid valve is arranged to selectively introduce a negative pressure such as an intake manifold vacuum, or atmospheric pressure into a working chamber of the diaphragm type actuator. By being supplied with the negative pressure or the atmospheric pressure, the diaphragm type actuator puts the second throttle valve either in a fully open position or in a closed position of about +E,fra 1/8+EE opening degree. An orifice or some other flow resisting means is provided to make an opening movement slower than a closing movement of the second throttle valve.
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