Patent ID: 6666014
Filing Date: 2003-12-23
Classification: F02C,Y02T

Abstract:
A fuel injection system in a turbomachine, the system comprising:a high pressure pump for pressurizing fuel coming from a fuel tank to a high pressure; a plurality of fuel injectors disposed in a combustion chamber of the turbomachine; and a metering unit interposed between said high pressure pump and said plurality of injectors to control the rate at which fuel flows into the injectors from the high pressure pump, wherein said metering unit comprises a pressurization valve and a metering valve, the metering valve being configured to control a flow of fuel from the high pressure pump to the pressurization valve to selectively provide at least two pressure levels to the pressurization valve, and wherein the pressurization valve comprises a first end inlet connected to a first load outlet of the metering valve, and a second end inlet opposite the first end inlet and connected firstly to the high pressure pump via a first diaphragm and secondly to a second load outlet of the metering valve via a second diaphragm, whereby fuel fed to said injectors connected to a pilot outlet of the pressurization valve is controlled by providing an unbalance in pressures applied to the two end inlets of the pressurization valve under control of a computer.