Patent ID: 8632061

Claim:
An active vibration isolating support apparatus in which an engine is elastically supported in a vehicle body, and a controller estimates a vibrational state of the engine based on an output from a sensor to detect a revolution change of the engine and drives an actuator to extend and contract so as to suppress transmission of vibration, comprising: a motoring state detecting unit configured to detect that the engine is in a motoring state at the time of the engine starting before actuating the engine; a natural roll vibration detecting unit configured to detect occurrence of a natural roll vibration based on a detected revolution speed of the engine when the motoring state detecting unit detects that the engine is in the motoring state; and a natural roll vibrational state information obtaining unit configured to obtain a natural roll vibrational state information based on an increasing rate in the revolution speed of the engine when the natural roll vibration detecting unit judges that the natural roll vibration has been started, wherein the natural roll vibrational state information maps a relationship between the increasing rate in the engine revolution speed and a natural roll vibration period such that the smaller the increasing rate in the engine revolution speed, the longer the natural roll vibration period, wherein natural roll vibration suppression control is performed based on the obtained natural roll vibrational state information when the motoring state detecting unit detects that the engine is in the motoring state, and wherein the natural roll vibrational state information includes a period determination map of the natural roll vibration and a control gain determination map of the natural roll vibration which are preset based on the increasing rate in the revolution speed.