Air-to-fuel ratio feedback control system for internal combustio

Details Air-to-fuel ratio feedback control system for internal combustio Air-to-fuel ratio feedback control system for internal combustio

1977-05-09

1979-03-13

Myhre, Charles J.

Internal-combustion engines

Noncompression

123 32EL, 123 32E, 60285, 60276, 123119EC, F02B 308, F02M 712, F01N 308

Patent

active

041436237

ABSTRACT:
In an air-to-fuel ratio feedback control system, air-to-fuel ratio of mixture supplied to an engine is controlled to be stoichiometric in response to the oxygen concentration in exhaust gases during normal operating conditions of the engine, whereas it is controlled irrespective of the oxygen concentration during specific operating conditions such as heavy load and no load conditions of the engine. Sensor output signal indicative of the oxygen concentration which is integrated to control the air-to-fuel ratio is cut off and integrator output signal is increased or decreased by a predetermined value during the specific conditions so that the mixture is controlled to be richer or leaner as desired than the stoichiometry.

REFERENCES:
patent: 3720191 (1973-03-01), Rachel
patent: 3875907 (1975-04-01), Wessel et al.
patent: 3916170 (1975-10-01), Norimatsu et al.
patent: 3926153 (1975-12-01), Reddy
patent: 3939654 (1976-02-01), Creps
patent: 3986352 (1976-10-01), Casey

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