Internal-combustion engines – Two-cycle – Pump and cylinder adjacent
Patent
1998-08-25
2000-02-01
Argenbright, Tony M.
Internal-combustion engines
Two-cycle
Pump and cylinder adjacent
123 65R, F02B 3306
Patent
active
060190752
ABSTRACT:
An internal combustion engine has a fuel and air mixing device which utilizes an open bore venturi to draw fuel from the device and deliver a rich fuel and air mixture to a compressor driven by the engine for direct injection of the rich fuel and air mixture into the engine. An engine air throttle body uses an engine throttle linkage and valve to control air flow into the engine crankcase and provides a positive air pressure signal, especially at small throttle openings, to assist the metering of fuel within the fuel and air metering device. The positive air pressure signal is preferably provided by a small port in the engine air throttle body slightly downstream of the throttle valve when closed and is communicated with the fuel and air metering device to cause additional fuel to be delivered from the device. This positive air pressure signal enhances the quantity of fuel metered especially at engine idle and low engine speeds when there is a very low flow of air through the open bore venturi of the fuel and air metering device and hence a low pressure differential created therein and thus only a small amount of fuel would be drawn through the device by the air flow pressure differential.
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Galka William E.
Kitamura Yukio
Argenbright Tony M.
Castro Arnold
Walbro Corporation
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