Patent ID: 7587888

Claim:
An engine control apparatus comprising: a turbo-supercharger driven by exhaust energy of an engine in a vehicle; an EGR (Exhaust Gas Recirculation) path interconnecting an exhaust path and an inlet path of the engine; at least one of a NO x trap catalyzer and a DPF (Diesel Particulate Filter) mounted in the exhaust path for purifying exhaust discharged from the engine; an EGR valve for adjusting the flow rate of air passing through the EGR path; and a controller configured to control the air excess coefficient to be in a rich condition during a regeneration operation in order to regenerate at least one of the NO x trap catalyzer and the DPF, and to bring the excess air coefficient back to a lean condition when switching the regeneration operation back to a normal operation, the controller being further configured to at least partially open the EGR valve when the air excess coefficient is in a rich condition during the regeneration operation, and to close the EGR valve to cancel the air passing through the EGR path when the air excess coefficient is changed to be in a lean condition from a rich condition.