Air fuel ratio control apparatus for engines
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United States of America Patent
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Issued Date -
Oct 27, 2005
app pub date -
Apr 22, 2005
filing date -
Apr 22, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An air fuel ratio control apparatus readily satisfies an emission requirement and is particularly preferable for small-displacement engines. The air fuel ratio control apparatus for an engine includes a fuel control member disposed in a fuel passage delivering fuel from a fuel metering chamber of a carburetor supplying the fuel to a suction passage of a comparatively small engine such as a general purpose engine, a working machine engine and the like, a combustion gas sensor disposed in an exhaust pipe in the engine, and an electronic control unit. The control unit actuates the fuel control member in response to a concentration of a combustion gas component in an exhaust gas detected by the combustion gas sensor so as to control a fuel flow rate.
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