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Active vibration insulator

  • US 7,756,619 B2
  • Filed: 06/12/2006
  • Issued: 07/13/2010
  • Est. Priority Date: 06/15/2005
  • Status: Active Grant
First Claim
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1. An active vibration insulator, comprising:

  • a first member attached to an engine;

    a second member attached to an engine frame;

    a main rubber elastic body elastically connecting the first member and the second member;

    a vibratable plate forming a pressure receiving chamber with the main rubber elastic body, the pressure receiving chamber receiving a vibration from the engine;

    an electromagnetic actuator including a core, around which a coil is wound, attached to the second member and a plunger attached to the vibratable plate and reciprocating relative to the core, the electromagnetic actuator generating vibrating forces depending on electric-current supplies;

    a controller for carrying out vibrating-forces generation control in which the electric-current supplies are made variable so as to actively inhibit vibrations generated by an on-vehicle vibration generating source of a vehicle from transmitting to a specific part of the vehicle based on cyclic pulsating signals output from the on-vehicle vibration generating source, thereby letting the electromagnetic actuator generate the vibrating forces;

    an acceleration sensor fixed to the second member and detecting a vibration of the second member; and

    a bad-roads processor for judging whether or not the vehicle is traveling on a bad road based on the vibration detected by the acceleration sensor and for stopping the vibrating-forces generation control effected by the controller when the vehicle is judged to be traveling on the bad road.

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