Method and apparatus for controlling the air-fuel ratio of an in

Method and apparatus for desulfating a no.sub.x trap

Method and apparatus for desulfating a NO.sub.x trap

Method and apparatus for desulfating a NOx trap

Method and apparatus for detecting degree of clogging in particl

Method and apparatus for detecting saturation gas amount absorbe

Method and apparatus for determining a temperature of an...

Method and apparatus for determining deterioration of three-way

Method and apparatus for determining the hydrocarbon conversion

Method and apparatus for diagnosing engine exhaust gas purificat

Method and apparatus for diagnosing engine exhaust gas purificat

Method and apparatus for diagnosing engine exhaust gas...

Method and apparatus for eliminating carbon collected in an exha

Method and apparatus for elimination of toxic oxides from exhaus

Method and apparatus for emission control

Method and apparatus for enabling lean engine operation upon...

Method and apparatus for enhancing the rate and efficiency...

Method and apparatus for estimating and controlling no x trap te

Method and apparatus for estimating oxygen storage capacity...

Method and apparatus for exhaust gas cleaning with trim control