Air-flow metering device for fuel injection system of internal combustion engine

Claim 1

An air-flow metering device for a fuel injection system of an internal combustion engine comprising; a retaining member fixed in an intake pipe of the engine so as not to interrupt air flowing therethrough into the engine, a shaft rotatably supported by said retaining member, a plurality of radial blades fixed to said shaft in said intake pipe, said blades having an angle of attack against a stream line of air flowing through said pipe so as to be turned by the lifting force produced by said air impinging on the blades, a metering plate fixed to said blades to extend outwardly therefrom, said plate having at least one cut-off portion and being adapted to turn as said blades turn; a disk fixed in said intake pipe adjacent said metering plate, said disk having at least one aperture therein in cooperative relationship with said cut-off portion for forming at least one air passage to said engine, said cut-off portion changing the cross sectional area of said air passage as the metering plate turns, and an electric turn detecting means connected with said shaft for converting the turn of said shaft into an electric signal.