Emission control apparatus with reduced hangover time to switch

Details Emission control apparatus with reduced hangover time to switch Emission control apparatus with reduced hangover time to switch

1977-02-11

1979-01-02

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123 32EE, 60276, 60285, F02B 3200, F02B 7510

Patent

active

041322002

ABSTRACT:
A closed-loop emission control apparatus for internal combustion engines includes exhaust composition sensor for feedback control of the air-fuel mixture. When the temperature in the exhaust passage is lower than the operating temperature of the sensor, control is switched to an open-loop mode. The feedback control signal is fluctuated above and below a predetermined DC bias at periodic intervals during the open-loop mode to switch the control to the closed-loop mode in a minimum transition time as soon as the sensor's temperature condition warrants feedback control.

REFERENCES:
patent: 3921612 (1975-11-01), Aono
patent: 3938479 (1976-02-01), Oberstadt
patent: 3939654 (1976-02-01), Creps
patent: 3986352 (1976-10-01), Casey
patent: 4019474 (1977-04-01), Nishimiya et al.
patent: 4029061 (1977-06-01), Asano
patent: 4030462 (1977-06-01), Sasayama et al.
patent: 4048479 (1977-09-01), Rivere
patent: 4057042 (1977-11-01), Aono
patent: 4058978 (1977-11-01), Bockelmann et al.

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