Closed loop carburetor air-fuel ratio control

Details Closed loop carburetor air-fuel ratio control Closed loop carburetor air-fuel ratio control

1975-10-20

1976-09-28

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123122H, F02M 3100

Patent

active

039825175

ABSTRACT:
A combustion engine with a carburetor and exhaust means is provided with an atmospheric air heater such as an exhaust stove. A metering valve supplies a variable mixture of heated air from the exhaust stove and cooler atmospheric air to the carburetor. The changing temperature and hence density of the air supplied to the carburetor produces a changing air-fuel ratio to the engine; and an oxygen sensor in the exhaust system generates a signal indicative of this ratio, which signal is applied through a feedback control system to actuation means for the metering valve to maintain the engine air-fuel ratio at a substantially constant predetermined level.

REFERENCES:
patent: 3444847 (1969-05-01), King
patent: 3459163 (1969-08-01), Lewis
patent: 3759232 (1973-09-01), Wahl

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