Air-fuel ratio control system

Details Air-fuel ratio control system Air-fuel ratio control system

1985-10-15

1987-03-24

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

123440, 123480, 123492, 123493, F02M 4100, F02M 700

Patent

active

046516999

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine has an electromagnetic valve for correcting the air-fuel ratio of air-fuel mixture, and an O.sub.2 sensor for detecting oxygen concentration in exhaust gases. A detecting circuit is provided for producing an acceleration signal when the engine is accelerated at cold engine operation. A pulse generating circuit is provided for producing a plurality of pulses, the duty ratios of which are proper for air-fuel ratio at acceleration in cold engine operation. A changeover switch is provided to respond to the acceleration signal for applying the pulses to the electromagnetic valve so as to control the air-fuel ratio.

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patent: 4399792 (1983-08-01), Otsuka et al.
patent: 4419975 (1983-12-01), Kubota et al.
patent: 4470395 (1984-09-01), Ohgami et al.

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