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System for actively reducing rotational nonuniformity of a shaft, in particular, the drive shaft of an internal combustion engine, and method for this

  • US 6,405,701 B1
  • Filed: 02/27/1998
  • Issued: 06/18/2002
  • Est. Priority Date: 08/31/1995
  • Status: Expired due to Fees
First Claim
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1. A system for active reduction of rotational fluctuations of a shaft comprising an electrical machine (4), with the electrical machine (4) being controlled in such a way thatin order to reduce rotational fluctuations, it produces a rapidly varying torque, wherein, if no mean accelerating or decelerating torque is generated, the rapidly varying torque defines a zero line and has a curved shape, and superimposes a positive or negative torque, respectively, over the rapidly varying torque to additionally generate a mean accelerating or decelerating or rheostatic braking torque, wherein as a result of such superimposition, the rapidly varying torque only shifts with respect to the zero line while maintaining the curved shape;

  • and wherein the rapidly varying torque acts in an alternating manner, i.e. by decelerating in the case of a positive rotational fluctuation of the shaft and by accelerating in the case of a negative rotational fluctuation of the shaft.

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