Closed circuit system for recycling the exhaust gases of a combu

Closed loop bias air/fuel ratio offset to enhance catalytic conv

Closed loop cold start retard spark control using ionization...

Closed loop control for desulfating a NO.sub.x trap

Closed loop fuel control using air injection in open loop modes

Closed-loop temperature control for an emission control device

Closely coupled exhaust catalyst system and engine strategy asso

Co-ordination of different requirements of the exhaust gas...

Coagulator for an exhaust gas scrubbing system for internal comb

Cogeneration system

Cold HC adsorption and removal apparatus for an internal combust

Cold start vehicle catalyst monitor

Cold start white smoke aftertreatment protection

Cold-start control systems for internal combustion engines

Collecting part structure of exhaust manifold

Collector device for the primary pipes of an exhaust manifold

Combatting air pollution

Combatting air pollution

Combatting air pollution

Combination catalyst/adsorber system for treating an engine exha