| 摘要 |
<p>There is disclosed a control system for the air actuated ahead and astern clutches and the engine speed governor of a marine propulsion system. Upon actuation of a throttle lever controlling a throttle valve, a selector valve is first actuated to operatively connect one or the other of the ahead or astern clutches to the control. Further movement of the throttle lever causes a relay valve to supply air at a pressure proportional to the throttle position to a main control valve which passes such air pressure to the selected clutch until a first control pressure is reached. Thereafter, air from the supply is supplied at a programmed rate to the selected clutch to continue inflation of the clutch until a second control pressure is reached whereupon a boost valve is actuated to connect full supply air pressure to the selected clutch. A governor control valve also receives the air output of the relay valve proportional to throttle position. When the pressure within the selected clutch exceeds the level of a biasing spring within the governor control valve, the governor valve opens and the air output proportional to throttle position is applied to the engine speed governor. Once open, the governor valve is subjected to a counter-biasing pilot pressure equal to its output pressure so that the valve will close whenever the pressure applied to the speed governor plus the biasing pressure of the spring in the governor valve exceeds the pressure of the air within the selected clutch.</p> |
