Spring devices – Resilient shock or vibration absorber – Including energy absorbing means or feature
Reexamination Certificate
2007-12-25
2007-12-25
King, Bradley (Department: 3683)
Spring devices
Resilient shock or vibration absorber
Including energy absorbing means or feature
C267S140150
Reexamination Certificate
active
10862883
ABSTRACT:
An actuator of an active engine vibration isolation support system is driven based on the first, second, third . . . duty groups calculated corresponding to the vibration periods t1, t2, t3. . . of the engine. When the engine rotational speed varies in the increasing direction and the vibration periods t1, t2, t3. . . become gradually shorter, parts of the first, second, third . . . duty groups overlap each other, and therefore an electrical current which is supplied to the actuator does not become 0 at the end of the duty groups, leading to a possibility that a peak value of the electrical current gradually increases so that not only the active vibration isolation support system cannot exhibit an effective vibration isolation function, but also the actuator generates heat. Therefore, for example, when the overlapping amount of the first and the second duty groups exceeds a threshold value, a duty ratio of the second duty group is made 0 to stop application of the electrical current to the actuator. Thus, the vibration isolation function of the active vibration isolation support system is prevented from being impaired by the variation in the frequency of the input vibration.
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Blackman William D.
Carrier Joseph P.
Carrier Blackman & Associates P.C.
Honda Motor Co. Ltd.
King Bradley
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