Active vibration reduction device

An active vibration reduction device reducing vibrations from the engine to a side of a vehicle body, comprising:

• a torque rod elastically supporting an engine relative to the side of the vehicle body, the torque rod including a pair of insulators and a rod part;
• and
• an inertial mass supported movably reciprocatively relative to the rod part along an axial direction of the rod part;
• wherein the pair of the insulators include shaft members, disposed inside hollow cylindrical members, attached to a side of the engine and the side of the vehicle body, respectively, the shaft members being elastically supported by the hollow cylindrical members;
• and wherein
• at least one of the pair of the insulators includes a stopper at an inner circumferential wall of the hollow cylindrical member, the stopper restricting a displacement of the shaft member in the axial direction of the rod part;
• the active vibration reduction device further comprising:
• a basic signal generating unit generating a basic signal correlating with a vibration frequency based on rotation speed information of the engine;
• a control signal generating unit generating a control signal to reduce the vibrations transmitted to the side of the vehicle body from the engine by performing an adaptive process which causes a filter coefficient of an adaptive filter to act on the basic signal;
• an offset vibration generating unit generating offset vibrations at the inertia mass based on the control signal;
• an error signal detecting unit for detecting an error signal regarding an error between the vibrations of the engine and the offset vibrations;
• a reference signal generating unit generating a reference signal obtained by correcting the basic signal on the basis of a simulated vibration transmission characteristic from the offset vibration generating unit to the error signal detecting unit;
• a filter coefficient updating unit updating the filter coefficient of the adaptive filter on the basis of the error signal and the reference signal;
• a static torque estimating unit estimating a static torque of the engine on the basis of the rotational speed information and load information of the engine;
• and
• a correction table storing unit storing correction tables of the simulated vibration transmission characteristics corresponding to a plurality of different value regions of the vibration frequencies with association with a plurality of different value regions of the static torque of the engine;
• wherein
• the reference signal generating unit generates the reference signal using the simulated vibration transmission characteristic obtained on the basis of the static torque of the engine estimated by the static torque estimating unit, a stored content of the correction table storing unit, and the simulated vibration transmission characteristic obtained based on the vibration frequency.