Walbro Corporation

Walbro Engine Management, L.l.c.

Massimo Casoni

William E Galka

Mark S Swanson

David L Speirs

Bradley Jon Roche

Eric G Zbytowski

Martin N Andersson

Ronald H Roche

John C Woody

Cyrus M Healy

Andrew Edwin Bejcek

James E Van Allen

Alessandro Pascoli

An engine system may include a fuel and air supply circuit and an exhaust circuit, a temperature sensor mounted on an exterior of the engine and an oxygen sensor located in the exhaust circuit. The fuel and air supply circuit may include a throttle body mounted on the engine and having a throttle valve to control the flow rate of air delivered to the engine, a fuel injector carried by the throttle body to deliver fuel to the engine and a fuel rail carried by at least one of the throttle body and the fuel injector and having an input to receive a supply of fuel and an outlet through which fuel is routed to the fuel injector. An engine control unit may be communicated with these components to control the fuel and air mixture provided to the engine as a function of the temperature and oxygen sensor outputs.

Fuel injected engine system

A method of operating an engine is disclosed, which includes determining a peak power condition for the engine, measuring a temperature associated with the engine at said peak power condition, comparing the temperature measured with a previously determined temperature associated with a known peak power condition of the engine, determining an offset value based on the comparison made in step, controlling at least one of an air-fuel mixture delivered to the engine or ignition spark timing based on said offset value. Various engine fuel delivery systems, carburetors, fuel injection and control systems also are disclosed.

Engine fuel delivery systems, apparatus and methods

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Castelfranco Emilia, Italy

Massimo Casoni