Closed-loop emission control apparatus for multi-cylinder intern

Details Closed-loop emission control apparatus for multi-cylinder intern Closed-loop emission control apparatus for multi-cylinder intern

1976-12-20

1978-11-28

Myhre, Charles J.

Internal-combustion engines

Noncompression

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

Patent

active

041270886

ABSTRACT:
A closed-loop emission control apparatus for a multi-cylinder internal combustion engine having a plurality of exhaust systems includes an exhaust composition sensor for each exhaust system and a failure detector responsive to the output from each exhaust composition sensor. The air-fuel ratios of the exhaust systems are controlled by a signal whose amplitude is representative of a mean value of the concentration values of the exhaust composition sensed by both working sensors, and in response to the output from the failure detector the ratios are controlled by a valid signal from a working sensor should the other fail.

REFERENCES:
patent: 3815561 (1974-06-01), Seitz
patent: 3903853 (1975-09-01), Kizler et al.
patent: 3938075 (1976-02-01), Reddy
patent: 3938479 (1976-02-01), Oberstadt
patent: 3955363 (1976-05-01), Manderscheid
patent: 4024707 (1977-05-01), Schmidt et al.
patent: 4040408 (1977-08-01), Kraus et al.

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