| 摘要 |
PROBLEM TO BE SOLVED: To provide an engine exhaust emission controller capable of accurately estimating an amount of accumulated oxygen in a catalyst at the end of a reduction treatment with a simple method.SOLUTION: An engine exhaust emission controller including: a secondary air introduction device 1000 introducing secondary air into an exhaust path; a count value accumulation unit 130 that includes an Osensor provided on a downstream side of a catalyst and detecting an air-fuel ratio, and that estimates an amount of accumulated oxygen (count value) in the catalyst when introducing the secondary air; and a rich spike control unit 118 that performs rich injection after introducing the secondary air, comprises a count value correction unit 132 that estimates the amount of accumulated oxygen after end of a reduction treatment by multiplying a correction coefficient derived from an output value SVO2 from the Osensor at the time of the end of the reduction treatment by the count value after introduction of the secondary air. |
