Internal-combustion engines – Two-cycle – Rear compression
Patent
1988-12-02
1990-02-27
Wolfe, Willis R.
Internal-combustion engines
Two-cycle
Rear compression
123438, 123494, 123534, 731182, F02B 3304
Patent
active
049036491
ABSTRACT:
A fuel control system for an internal combustion engine includes means for pneumatically amplifying sensed air flow pressure differential through an air intake venturi between a first combustion air pressure sensor outside the venturi and a second combustion air pressure sensor in the venturi. Pressure at the inner end of the second pressure sensor is reduced by altering the air flow path to create a vacuum at the inner end of the second pressure sensor relative to the remaining air flow through the venturi. A throttle plate in the venturi has a by-pass hole therethrough directing air flow along a given direction past the inner end of the sensor and through the by-pass hole when the throttle plate is in the idle position. The given direction of air flow past the inner end of the sensor prevents air flow into the inner end of the sensor tube to prevent an increase of sensed pressure thereat, and instead creates a vacuum to pull air out of the inner end of the sensor tube, to reduce pressure thereat. The system maintains a sufficient sensed pressure differential between the sensed pressure outside of the venturi and the sensed pressure in the venturi, including at idle, and also amplifies sensed pressure differential to provide improved tracking of fuel flow requirements between prescribed lean limit and rich limit requirements, including at idle and low speed.
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Brunswick Corporation
Wolfe Willis R.
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