Air-fuel ratio adjusting apparatus for an internal combustion en

Details Air-fuel ratio adjusting apparatus for an internal combustion en Air-fuel ratio adjusting apparatus for an internal combustion en

1976-09-13

1978-10-24

Myhre, Charles J.

Internal-combustion engines

Noncompression

123119EC, 123119D, 60276, 60285, F02B 308, F02M 712, F01N 308

Patent

active

041215460

ABSTRACT:
An air-fuel ratio adjusting apparatus for an internal combustion engine employing a gas sensor whose electric characteristic changes rapidly at near the stoichiometric air-fuel ratio so as to maintain the air-fuel ratio of mixture at any desired air-fuel ratio other than the stoichiometric one. A bypass valve is mounted in a bypass passage for supplying additional air to the portion of the carburetor downstream of its throttle valve. In response to the sensed signal from the gas sensor mounted in the exhaust pipe, the bypass valve is opened or closed to increase or decrease the amount of additional air. Taking advantage of the fact that there exists a delay of a definite time period between the time of generation of a sensed signal from the gas sensor and the time that the sensed signal produces an effect on the excess air factor of the exhaust gases, by causing the opening and closing speeds of the bypass valve to differ from each other, it is possible to maintain the air-fuel ratio of mixture constant within a wide range of air-fuel ratios.

REFERENCES:
patent: 3759232 (1973-09-01), Wahl et al.
patent: 3923016 (1975-12-01), Hoshi
patent: 3991726 (1976-11-01), Kawai et al.
patent: 4019474 (1977-04-01), Nishimiya et al.
patent: 4022171 (1977-05-01), Laprade et al.
patent: 4023357 (1977-05-01), Masaki
patent: 4027478 (1977-06-01), Masaki et al.

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