Patent ID: 6272843
Filing Date: 2001-08-14
Classification: F02C,F05D,Y02T

Abstract:
A fuel metering system for a turbojet engine, comprising:a feed pipe;a supply pipe to the engine;a recirculation pipe for excess fuel;a main metering valve at a transition from the feed pipe to the supply pipe and having a control-related connection with an electronic engine controller;control-related connections between the engine controller and a measuring device for the position of the main metering valve and a measuring device for the pressure difference of the main metering valve;an automatically-opening, pressure-limiting device for limiting maximal pressure in the feed pipe and having a flow connection to the recirculation pipe; anda recirculation valve comprising:a motor-driven adjusting device having a control-related connection with the electronic engine controller;a valve position-detecting device having a control-related connection with the electronic engine controller,wherein the recirculation valve keeps a pressure difference between an inlet and an outlet of the main metering valve constant and limits a fuel flow through the main metering valve if the main metering valve is unintentionally opened too far.