GASEOUS FUEL CONTROL DEVICE FOR ENGINES

摘要

A fuel control device or fuel valve assembly includes a valve for metering flow of gaseous fuel to an engine, a drive device associated with the valve to adjust the effective flow area of the valve, a flow meter with at least one fixed area orifice located upstream of the valve, and one or more sensors to measure predetermined parameters of the fuel flowing through the flow meter. A controller receives input from the flow sensor or sensors and a fuel demand signal from the engine control, calculates current flow rate based on the sensor inputs, and controls the drive device to adjust the valve flow area up or down depending on the difference between the calculated flow rate and current fuel demand signal.

主权项

1. A gaseous fuel control assembly comprising:
a flow control valve housing having a gaseous fuel inlet, a metered gaseous fuel outlet for fuel supply to an engine, and a passageway between the gaseous fuel inlet and outlet; a flow control valve mounted in the passageway having an adjustable flow area for metering flow of fuel to an engine; an adjustment device associated with the flow control valve to adjust the effective flow area of the valve; a flow measurement device having at least one fixed area orifice located upstream of the flow control valve, and at least one sensor associated with the orifice and configured to measure predetermined parameters of the fuel flowing through the orifice; and a controller which receives input from the at least one sensor and a fuel demand signal from the engine, the controller having a processing module for calculating current flow rate based on the sensor input, a comparator module which compares the calculated flow rate with the fuel demand signal, and a valve control module which controls the adjustment device to adjust the flow area of the flow control valve up or down depending on the difference between the calculated current flow rate and current fuel demand signal.