Patent ID: 11939902
Assignee: HYUNDAI MOTOR COMPANY
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  B  Y | IPC B  F

Claim 7:
8. A method of purifying exhaust gas of a hybrid vehicle, the method comprises:
when a vehicle door is opened, measuring, by a controller, an ambient temperature using a temperature sensor and determining, by the controller, whether the ambient temperature satisfies a cold start condition;
before an engine is ignited in the cold start condition, controlling, by the controller, a three-way valve to direct heated air discharged from an electric supercharger to be blown toward an electrically-heated catalyst through a recirculation line connected to the three-way valve;
after the heated air is blown toward the electrically-heated catalyst, when an operation time for heating the electrically-heated catalyst has passed for a predetermined operation time or shorter than the predetermined operation time, determining, by the controller, again whether the engine is ignited; and
when the engine is ignited in a situation in which the electrically-heated catalyst is heated by the heated air, turning the electric supercharger off, controlling, by the controller, the three-way valve to block opening of the recirculation line, and then, starting the engine.