Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1993-03-22
1994-10-11
Dolinar, Andrew M.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123585, 123704, F02D 4114, F02M 2304
Patent
active
053537769
ABSTRACT:
The system for controlling the air/fuel mixture introduced into a lean burn engines includes a fuel/air mixing carburetor that is connected to the intake conduit to the engine and an air by-pass conduit that is also connected to the intake conduit. The main throttle valve is located downstream of the connection between the carburation conduit and the by-pass conduit so that mixing of the carbureted fuel/air mixture with the by-pass air occurs upstream of the main throttle valve. Accordingly, the main throttle valve does not control the air/fuel ratio but rather controls the quantity of fuel being introduced into the engine. The by-pass throttle valve may be controlled by an oxygen sensor in the exhaust system or by a fuel sensor in the intake system, when operating on natural gas, gasoline, hydrogen or alcohol fuel, as desired.
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Burrahm Robert W.
Meyers David P.
Dolinar Andrew M.
Southwest Research Institute
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