Fuel injection systems for internal combustion engines

A method of fuel injection for an internal combustion engine having one or more combustion chambers and wherein a metered individual quantity of fuel entrained in a gas charge is injected individually by the pressure of the gas directly into each combustion chamber each combustion cycle thereof, the method including the steps of delivering gas from at least one combustion chamber of the engine to a gas reservoir, controlling said delivery of gas to the gas reservoir to substantially maintain the gas therein at a pressure above the maximum compression pressure in the combustion chamber prior to commencement of combustion in said combustion chamber, and supplying gas at a regulated pressure from said gas reservoir to receive the metered quantity of fuel and effect delivery of that fuel into the respective combustion chamber.

A method of fuel injection for an internal combustion engine having one or more combustion chambers and wherein a metered quantity of fuel entrained in a gas charge is delivered to the engine, the method including the steps of delivering gas from at least one combustion chamber of the engine to a gas reservoir, controlling said delivery of gas to said gas reservoir to substantially maintain the gas in said gas reservoir above a predetermined pressure, and supplying gas at a regulated pressure below said predetermined pressure from said gas reservoir to effect delivery of fuel to the engine.

A method of injecting fuel for an internal combustion engine comprising preparing a metered quantity of fuel in accordance with the engine fuel demand, entraining said metered quantity of fuel in a gas charge at a predetermined pressure sufficient to deliver the fuel to the engine, delivering said gas charge and the entrained fuel to the engine in timed relation to the engine cycle, supplying said gas charge from a gas reservoir, delivering gas to said reservoir from at least one combustion chamber of said engine and regulating said delivery of gas from the combustion chamber to maintain the gas in the reservoir substantially at said predetermined pressure.

A fuel injection system for an internal combustion engine comprising fuel metering means adapted to prepare a metered quantity of fuel in accordance with the engine fuel demand, means to selectively deliver said metered quantity of fuel to the engine entrained in a charge of gas supplied from a gas reservoir, means to supply gas to said gas reservoir from at least one combustion chamber of the engine, means to control the supply of gas to said reservoir from the combustion chamber to substantially maintain a pressure therein above the pressure required to effect delivery of the fuel to the engine, and means to supply gas from the gas reservoir at a regulated pressure to effect delivery of the fuel to the engine.

A fuel injection system for an internal combustion engine having one or more combustion chambers, said system comprising means to prepare individual metered quantities of fuel each entrained in a gas charge and injecting each individual quantity of fuel by the pressure of the gas directly into a respective combustion chamber each combustion cycle thereof, means to supply gas from at least one combustion chamber of the engine to a gas reservoir, means to control said supply of gas to the gas reservoir to substantially maintain the gas therein at a pressure above the maximum compression pressure in the combustion chambers prior to commencement of combustion, and means to supply gas at a regulated pressure from said gas reservoir to receive the metered quantity of fuel and to effect delivery of that fuel into the respective combustion chamber.