Patent ID: RE39965

Claim:
A vibration suppressing apparatus for suppressing a vibration of an internal combustion engine caused by a cranking of the internal combustion engine performed by a motor, comprising: a rotational phase detector that detects a rotational phase of a crankshaft of the internal combustion engine; and a controller that controls an operation of the motor based on the detected rotational phase of the crankshaft detected by the rotational phase detector so that an output torque of the motor fluctuates during the cranking similarly to a fluctuation in a resistance torque against the cranking of the internal combustion engine that the crankshaft presents in accordance with the rotational phase of the crankshaft, the fluctuation in the resistance torque including at least a fluctuation in a resistance torque caused by compression of an intake air by the internal combustion engine, wherein the controller estimates the fluctuation in the resistance torque against the cranking of the internal combustion engine that the crankshaft presents in accordance with the rotational phase of the crankshaft, and the controller adjusts the rotational phase of the crankshaft occuring at a beginning of the cranking to a predetermined phase.