First and second air feeding means to regulate a/f ratio wherein

Details First and second air feeding means to regulate a/f ratio wherein First and second air feeding means to regulate a/f ratio wherein

1976-08-30

1978-01-17

Croyle, Carlton R.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60290, 123124B, 192 084, F02B 7510, F01N 315, F02M 2300

Patent

active

040684725

ABSTRACT:
An exhaust gas purifying device for an internal combustion engine, comprising a catalytic converter containing a three way catalyzer therein, a first oxygen sensor disposed in the exhaust passage, and an air-fuel ratio regulating means for regulating an air-fuel ratio of the mixture fed into the cylinder of the engine so as to conform it to the stoichiometric air-fuel ratio in response to an output signal of said first oxygen sensor over a larger range of running conditions of a vehicle. Said exhaust gas purifying device further comprises a second oxygen sensor located downstream of the catalytic converter, and a secondary air feeding device located upstream of the catalytic converter for regulating the feeding of a secondary air into the exhaust gas in response to an output signal of said second oxygen sensor so that the ratio of the air consisting of said secondary air and air contained in the mixture introduced into the cylinders of the engine to the fuel contained in the mixture introduced into the cylinders is made equal to the stoichiometric air-fuel ratio at the time of acceleration, deceleration and gear-shifting.

REFERENCES:
patent: 3236344 (1966-02-01), Wawrzinick et al.
patent: 3696618 (1972-10-01), Boyd et al.
patent: 3962867 (1976-06-01), Ikeura et al.
patent: 3977375 (1976-08-01), Laprade et al.
patent: 3986352 (1976-10-01), Casey

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