Electric device and method for controlling electric device

An electric device comprising:

• an internal combustion engine;
• a motor that drives the internal combustion engine;
• and
• a controller, wherein
• in a case where the rotation speed of the internal combustion engine at the time when it has been determined that the internal combustion engine is to transition to a rotation stop state is higher than a specified threshold, the controller performs rotation-speed increasing control for making the rotation speed of the internal combustion engine temporarily higher than the rotation speed at the time of the determination with a throttle remaining closed, and
• in a case where the rotation speed of the internal combustion engine at the time of the determination is not higher than the threshold, the rotation speed of the internal combustion engine does not become higher than the rotation speed at the time of the determination but decreases, and the internal combustion engine stops.

An electric device comprising:

• an internal combustion engine;
• and
• a motor that drives the internal combustion engine, wherein
• in a case where the rotation speed of the internal combustion engine at the time when it has been determined that the internal combustion engine is to transition to a rotation stop state is higher than a specified threshold, the rotation speed of the internal combustion engine increases with a throttle remaining closed, and
• in a case where the rotation speed of the internal combustion engine at the time of the determination is not higher than the threshold, the rotation speed of the internal combustion engine monotonously decreases.