Carburetor with lagging bypass air valve
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United States of America Patent
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Apr 5, 1994
Grant Date -
N/A
app pub date -
Dec 18, 1992
filing date -
Dec 18, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved carburetor useful for reducing emissions of small gasoline powered engines commonly used to power lawnmowers and the like has a bypass air inlet and valve for venting amounts of fresh air into the fuel/air mixture to lean the mixture prior to combustion. The enleanment of the fuel/air mixture reduces carbon monoxide and hydrocarbon emissions. The valve lags the engine load condition such that during a sudden high load condition (e.g. during acceleration) the valve remains momentarily closed to provide a rich fuel/air mixture. Likewise, during a sudden lightened load condition (e.g. during deceleration or shutoff) the valve remains momentarily open to provide a lean fuel/air mixture. Hence, emissions are reduced while engine performance and response are not compromised. In the preferred embodiment, a mechanical linkage connects the bypass air valve to the engine throttle. The lagging function is controlled by a mechanical or electrical damper. In an alternate embodiment, the lagging bypass valve is controlled according to engine temperature which inherently lags the current engine load condition.
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