Fuel metering apparatus

Details Fuel metering apparatus Fuel metering apparatus

F - Mech Eng,Light,Heat,Weapons

02

D

341/38.122

F02D 41/00 (2006.01) F02M 69/20 (2006.01) F02M 69/38 (2006.01)

Patent

CA 1207866

ABSTRACT OF THE DISCLOSURE A fuel/air ratio control apparatus for a reciprocating engine used in light aircraft including a fuel metering apparatus (32) and an electronic fuel/air ratio control (39). The control (39) generates an electrical signal (Wf/Wa) indicative of a desired fuel/air ratio based upon the flight condition of the aircraft and the metering apparatus (32) meters fuel flow (Wf) according to the mass airflow (Wa) ingested by the engine. The fuel metering apparatus (32) positions a metering valve (348) by means of a force balance of opposing forces developed by an air diaphragm (330) and a fuel diaphragm (336). The fuel dia- phragm (336) is subjected to the differential pressure of a metering head pressure (Pu) and a fuel output pressure (Pm). The output pres- sure (Pm) is regulated by a controlled orifice (343) influenced by a proportional solenoid (406) whose armature valve (341) is positioned by the electrical signal (Wf/Wa).

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