Air-to-fuel ratio feedback control system

Details Air-to-fuel ratio feedback control system Air-to-fuel ratio feedback control system

1977-04-12

1978-08-15

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123 32EE, 60285, F02B 3300

Patent

active

041064500

ABSTRACT:
An air-to-fuel ratio feedback control system which normally functions to correct the air-to-fuel ratio of a mixture supplied to an internal combustion engine to a predetermined air-to-fuel ratio in accordance with an output signal of an air-to-fuel ratio detector disposed in an exhaust passage. The system detects an inoperable period of the air-to-fuel ratio detector due to a low engine temperature and stops the feedback correction of the air-to-fuel ratio to prevent erroneous correction. Furthermore, during the full load operation and idling operation the system holds the feedback correction of the air-to-fuel ratio respectively at a little smaller and larger than the stoichiometric ratio irrespective of the output of the air-to-fuel ratio detector and enables to easily return to substantially the stoichiometric one when the engine operating condition returns to normal operation.

REFERENCES:
patent: 3831564 (1974-08-01), Schmidt et al.
patent: 3895611 (1975-07-01), Endo et al.
patent: 3931808 (1976-01-01), Rachel
patent: 3990411 (1976-11-01), Oberstadt et al.
patent: 4029061 (1977-06-01), Asano

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