ENGINE ROTATIONAL SPEED CONTROL APPARATUS

A rotational speed control apparatus for an engine (10) is provided. The engine (10) is configured to drive a compressor (24) for air conditioning. The rotational speed control apparatus includes an electronic control unit (25). The electronic control unit (25) is configured to: (a) correct a calculated value of the load torque in accordance with a deviation between a rotational speed of the engine (10) and the target rotational speed, as changeover transition period control, in a changeover transition period; and (b) set an execution period of the changeover transition period control such that the execution period in a changeover transition period from the stopped state of the compressor (24) to the driven state of the compressor (24) is longer than an execution period of the changeover transition period control in a changeover transition period from the driven state of the compressor (24) to the stopped state of the compressor (24).