Exhaust emission purification control device for engine

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United States of America Patent

PATENT NO 9441566
APP PUB NO 20140294678A1
SERIAL NO

14156757

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Abstract

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An exhaust emission purification control device for an engine that accurately estimates an accumulated oxygen amount of a catalyst at a terminating time of a reduction treatment which includes a secondary air injector that injects secondary air within an exhaust path, a sensor which detects an air-fuel ratio in a downstream side of a catylyst, a count-value accumulator which estimates an accumulated oxygen amount (a count value) in the catalyst during the secondary air injection, and a rich spike controller which performs rich injection after the secondary air injection. The device includes a count-value corrector that multiplies the count value after the secondary air injection by a correction coefficient derived from an output value SVO2 of the O2 sensor during termination of reduction treatment, so as to estimate the accumulated oxygen amount during the termination of the reduction treatment.

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Patent Owner(s)

Patent OwnerAddress
HONDA MOTOR CO LTD1-1 MINAMI-AOYAMA 2-CHOME MINATO-KU TOKYO 1078556 ?1078556

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujita, Shinji Wako, JP 94 485
Nakano, Shinya Wako, JP 35 226
Sakiyama, Satoko Wako, JP 1 2
Takano, Yuki Wako, JP 23 56

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