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A fuel measurement and control system for a gaseous fuel engine having a solenoid actuated fuel flow control valve which is electronically actuated to control a desired metering duration when the control system is operating in a fuel flow control mode. The fuel measurement and control system further

A fuel measurement and control system for a gaseous fuel engine having a solenoid actuated fuel flow control valve which is electronically actuated to control a desired metering duration when the control system is operating in a fuel flow control mode. The fuel measurement and control system further includes mode control valve for switching the control system between a fuel flow control mode and a positive fuel shutoff mode, wherein the fuel flow control valve is prevented from opening when the control system is operating in a positive fuel shutoff mode. The fuel flow control valve includes a pressure balance chamber to balance the biasing forces acting on the valve from the gaseous fuel, wherein gaseous fuel is introduced into the pressure balancing chamber to provide the balancing forces. The mode control valve connects the pressure balance chamber to either the fuel supply or the air stream mixer inlet to provide the desired pressure in the pressure balance chamber, wherein the fuel flow control valve is biased to a closed position and prevented from opening when the pressure balance chamber is connected to the air stream mixer inlet and the fuel flow control valve is pressure balanced and may be actuated to control fuel flow when the pressure balance chamber is connected to the gaseous fuel supply. A damping chamber is connected to the pressure balance chamber for damping the oscillations of the solenoid actuator and further reducing the effects of engine vibrations on the solenoid actuator.

대표청구항 ▼

[ What is claimed is:] [1.] A control system for a gaseous fuel engine, comprising:fuel supply means including a supply passage for supplying gaseous fuel;a fuel flow control means for controlling the flow of gaseous fuel from said supply passage into the engine, said fuel flow control means includi

[ What is claimed is:] [1.] A control system for a gaseous fuel engine, comprising:fuel supply means including a supply passage for supplying gaseous fuel;a fuel flow control means for controlling the flow of gaseous fuel from said supply passage into the engine, said fuel flow control means including a valve element mounted for reciprocal movement and a valve actuator for moving said valve element between an open position permitting gaseous fuel flow into the engine and a closed position blocking fuel flow into the engine,a mode control means for selectively switching the control system between a fuel flow control mode in which said valve actuator may be operated to move said valve element between said open and closed positions and a positive fuel shutoff mode in which said valve actuator is prevented from moving said valve element into said open position.