Patent ID: 8356472

Claim:
An exhaust purification device for a hybrid electric vehicle, in which a generator is driven by using power from an engine which is not used for moving the vehicle, electric power generated by the generator is stored in a battery, and an electric motor that is driven by the electric power supplied from the battery is used as a power source for moving the vehicle, comprising: an ammonia selective reduction-type NOx catalyst interposed in an exhaust passage of the engine, for selectively reducing NOx contained in exhaust gas by using ammonia as a reducing agent; a urea water supply unit for supplying urea water into the exhaust gas existing upstream of the ammonia selective reduction-type NOx catalyst; and a control unit for starting or stopping the engine in accordance with a storage state of the battery and controlling the urea water supply unit in accordance with an operating state of the engine, wherein when the engine in operation is to be stopped, the control unit stops the engine after executing, over a predetermined period prior to stoppage of the engine, an adsorption increasing operation in which an amount of ammonia adsorbed by the ammonia selective reduction-type NOx catalyst is increased, compared with that before the predetermined period.