Method and apparatus for metering fuel

A method of metering fuel to an internal combustion engine comprising providing a respective fuel and gas supplies at respective pressures to a chamber, communicating the chamber periodically with the engine for delivery of fuel to the engine by a gas flow from the chamber, and controlling the pressure differential existing between the fuel and gas supplies during said periods of communication to control the quantity of fuel delivered to the engine.

A method of metering fuel to an internal combustion engine comprising providing continuously a supply of fuel under pressure to a closed fixed capacity chamber, periodically admitting gas to said chamber to maintain in the chamber a pressure not greater than the fuel pressure, and opening a delivery port in said chamber for substantially the duration of the period of admission of gas to the chamber, whereby fuel in the chamber at the opening of the delivery port and fuel entering the chamber during the period that the delivery port is open is delivered from the chamber through the delivery port to the engine.

A method as claimed in 1, 2, 9, 10, 11 or 12 wherein the fuel pressure is regulated by controlling the pressure differential through an orifice in the fuel supply.

A method of metering fuel to an internal combustion engine comprising supplying fuel and gas independently to a fixed volume chamber, said fuel being supplied through a fixed size constantly open orifice, periodically communicating said chamber while fuel and gas are being supplied thereto with the engine to deliver fuel from the chamber to the engine, said gas being supplied to the chamber at least during said periods when the chamber is in communication with the engine, and varying the pressure difference between the fuel supply and gas supply in response to changes in the engine load to vary the rate of fuel flow through the orifice into the chamber to thereby control the quantity of fuel delivered to the engine per engine cycle.

A method of metering fuel to an internal combustion engine comprising supplying fuel and gas at respective pressures separately and simultaneously to a chamber, cyclically communicating said chamber with the engine to deliver the fuel from the chamber to the engine by a flow of gas with fuel entrained therein from the chamber, and controlling the quantity of fuel delivered to the engine per engine cycle by varying the pressure differential between the fuel and gas supplied to the chamber in response to changes in the engine load to thereby vary the rate of fuel flow into the chamber.

A method of metering fuel to an internal combustion engine comprising providing respective fuel and gas supplies at respective pressures to a chamber, communicating the chamber periodically with the engine for delivery of fuel to the engine by a gas flow from the chamber, and controlling the quantity of fuel delivered to the engine by controlling the pressure differential existing between the fuel and gas supplies during said periods of communication.

A method of metering fuel to an internal combustion engine comprising supplying fuel and gas independently to a fixed volume chamber, said fuel being supplied through a fixed size constantly open orifice, periodically communicating said chamber while fuel and gas are being supplied thereto with the engine to deliver fuel from the chamber to the engine, said gas being supplied to the chamber at least during said periods when the chamber is in communication with the engine, and controlling the quantity of fuel delivered to the engine per engine cycle by varying the pressure difference between the fuel supply and gas supply in response to changes in the engine load to vary the rate of fuel flow through the orifice into the chamber.