Method of injecting fuel into an engine

摘要

A method of operation of a dual fluid fuel injection system arranged to supply fuel to a cylinder of an internal combustion engine, the dual fluid fuel injection system being controllable to effect fuel metering events and fuel delivery events. The method comprises operating the dual fluid fuel injection system so as to have at least one fuel delivery event during each engine cycle and to have fewer than one fuel metering event, on average, per engine cycle. An electronic control unit for implementing the method is also described. The method and control unit allow dynamic range of a fuel metering injector, where included within the dual fluid fuel injection system, to be extended.

主权项

1. A method of controlling a dual fluid fuel injection system for an internal combustion engine, the dual fluid fuel injection system having a fuel metering injector to meter a quantity of fuel, and a delivery injector arranged to deliver air and at least a portion of the metered fuel to a cylinder of an internal combustion engine, the dual fluid fuel injection system being controlled by an electronic control unit (ECU) to effect fuel metering events and fuel delivery events, the method comprising the steps of:
the ECU controlling the fuel metering injector to effect fewer than one fuel metering event, on average, per engine cycle, to meter a quantity of fuel; and the ECU controlling the fuel delivery injector to effect an air and fuel delivery event to deliver the air and at least a portion of the metered quantity of fuel to the cylinder of the internal combustion engine during each engine cycle.