Exhaust purification device

An exhaust purification device configured to be installed in a vehicle, the vehicle comprising an engine and an electric motor capable of power transmission to and from a crankshaft of the engine, the exhaust purification device comprising:

• an electrically heated catalyst configured to be heated by power supply, and to purify exhaust of the engine at a predetermined activation temperature or higher;
• an exhaust pipe having a vacuum layer that covers at least an entire side surface of the electrically heated catalyst;
• a first opening/closing valve disposed upstream of the electrically heated catalyst in the exhaust pipe and configured to open and close the exhaust pipe;
• a second opening/closing valve disposed downstream of the electrically heated catalyst in the exhaust pipe and configured to open and close the exhaust pipe;
• and
• a control unit configured to control the power supply to the electrically heated catalyst and driving of the first opening/closing valve and the second opening/closing valve,
• wherein the control unit is configured to
• when closing the first opening/closing valve and the second opening/closing valve after the vehicle is stopped and the engine is shut down,
• drive the electric motor to motor the engine, discharge residual combustion gas from inside the engine and the exhaust pipe, and replace the residual combustion gas with fresh air,
• then close the second opening/closing valve to heat the electrically heated catalyst to a first target temperature,
• thereafter, when a temperature of the electrically heated catalyst reaches the first target temperature, stop the power supply to the electrically heated catalyst, and close the first opening/closing valve.