초록 ▼

A gas fuel admission system for use with a gas fuel supply and an internal combustion engine having an engine control unit that produces a desired mass flow signal. The system has a continuously variable gas fuel admission valve having a flow control element and nozzle for metering gas in sonic flow

A gas fuel admission system for use with a gas fuel supply and an internal combustion engine having an engine control unit that produces a desired mass flow signal. The system has a continuously variable gas fuel admission valve having a flow control element and nozzle for metering gas in sonic flow from the gas supply to the engine with insensitivity to the valve discharge pressure. An actuator moves the flow control element relative to the nozzle. The system also has a flow control circuit that responds to the desired mass flow signal from the engine control unit, a gas supply pressure signal from a gas supply pressure sensor, a gas supply temperature signal from a gas supply temperature sensor, and a flow control element position signal from a flow control element position sensor to determine the appropriate flow control element position needed to achieve the desired mass flow at the present engine operating conditions.

대표청구항 ▼

[ What is claimed is:] [1.] A gas fuel admission system for use with a gas supply and an internal combustion engine having an engine control unit that produces a desired mass flow signal for present engine operating conditions, said fuel admission system comprising:a gas fuel admission valve having

[ What is claimed is:] [1.] A gas fuel admission system for use with a gas supply and an internal combustion engine having an engine control unit that produces a desired mass flow signal for present engine operating conditions, said fuel admission system comprising:a gas fuel admission valve having a needle and a converging-diverging type nozzle for metering gas from the gas supply to the engine, said nozzle having a converging inlet and diffusing outlet;an actuator for moving said needle relative to said nozzle;a gas supply pressure sensor for producing a signal related to gas supply pressure;a gas supply temperature sensor for producing a signal related to gas supply temperature;a position sensor for producing a signal related to the position of said needle; anda flow control circuit responsive to said desired mass flow signal from said engine control unit, said supply pressure signal, said supply temperature signal, and said needle position signal to determine the appropriate needle position needed to achieve the desired mass flow at the present engine operating conditions.