초록 ▼

A gaseous carburetor or fuel control system includes a fuel metering assembly, a venturi mixer assembly, a throttle assembly, and an electronic control unit. The control unit controls the fuel metering assembly in a closed loop manner based on detected gas and air pressure to an air/fuel mixing vent

A gaseous carburetor or fuel control system includes a fuel metering assembly, a venturi mixer assembly, a throttle assembly, and an electronic control unit. The control unit controls the fuel metering assembly in a closed loop manner based on detected gas and air pressure to an air/fuel mixing venturi. An electronic governor which controls the throttle valve may also be controlled by the same control unit which controls the fuel metering assembly, using a separate control loop.

대표청구항 ▼

The invention claimed is: 1. A fuel control system for a gas engine, comprising:an air/fuel mixing venturi which supplies an air/fuel mixture to a gas fuel engine, the venturi having a reduced area throat, an air supply inlet to the venturi, and a plurality of gas fuel injection ports at the venturi

The invention claimed is: 1. A fuel control system for a gas engine, comprising:an air/fuel mixing venturi which supplies an air/fuel mixture to a gas fuel engine, the venturi having a reduced area throat, an air supply inlet to the venturi, and a plurality of gas fuel injection ports at the venturi throat, whereby gas flows through the injection ports to the venturi throat as a function of flow of air through the air supply inlet;a fuel metering assembly which controls the supply of gaseous fuel to the gas fuel injection ports of the air/fuel mixing venturi;an air/fuel ratio control module which establishes a first differential pressure setpoint between gaseous fuel and air inputs to the air/fuel mixing venturi, the first differential pressure setpoint being adjusted as a function of an engine operating parameter;a first differential pressure sensor which detects a differential pressure between the actual pressure of fuel supplied to a fuel inlet of an air/fuel mixing venturi and the air inlet pressure to an air inlet of the venturi; anda first pressure control module associated with the air/fuel ratio control module and first differential pressure sensor which controls the fuel metering assembly to vary the injection pressure of gaseous fuel supplied to the air/fuel mixing venturi based on a detected difference between the first differential pressure setpoint and the detected differential pressure.