| 摘要 |
A constant speed driving device has an ejector for supplying negative pressure to an actuator which controls the engine's throttle valve. The ejector includes a diffuser communicating with the engine intake manifold downstream of the throttle valve and a nozzle communicating through a pressure responsive control valve with the intake conduit upstream of the throttle valve and downstream of the supercharger. A negative pressure suction port of the ejector communicates with the negative pressure inlet port of the actuator. The constant speed control device is capable of supplying, even in the operation of the supercharger, a sufficiently increased negative pressure to the actuator for operating the throttle valve without the need to provide a vacuum pump. Further, the speed control device includes an electro-magnetic valve connected to the engine computer, which valve being is responsive to an input signal from the computer to pressure lock the pressure responsive control valve in its closed position so that the pressure from the supercharger cannot cause an air stream to flow through the nozzle. As a result, no negative pressure is applied to the actuator by the ejector.
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