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DYNAMOMETER SYSTEM

  • US 20150101421A1
  • Filed: 02/27/2013
  • Published: 04/16/2015
  • Est. Priority Date: 02/29/2012
  • Status: Active Grant
First Claim
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1. A dynamometer system comprising:

  • a dynamometer that is connected by a common shaft to a load device;

    an inverter that supplies electric power to the dynamometer;

    an encoder that detects a rotational position or angular velocity of the dynamometer;

    a shaft torque meter that detects shaft torque between the load device and the dynamometer; and

    a control device that controls the dynamometer based on a detection value of the encoder and a detection value of the shaft torque meter,wherein the control device includes;

    a main control unit that calculates a torque-current-command value to serve as an input to the inverter, based on a command value relative to the detection value of the encoder inputted externally, and the detection value of the encoder;

    a shaft-torque-detection-compensation unit that adds a compensation amount obtained by multiplying a filter transfer function and a suppression gain by the detection value of the shaft torque meter, to the torque-current-command value calculated by the main control unit, so as to correct the torque-current-command value; and

    a disturbance observer compensation unit that calculates a disturbance observer based on the detection value of the encoder and the torque-current-command value calculated by the main control unit, and subtracts the disturbance observer thus calculated from the torque-current-command value calculated by the main control unit, so as to correct the torque-current-command value,wherein the filter transfer function of the shaft-torque-detection-compensation unit is set with only a resonance frequency of a mechanical system consisting of the load device and the dynamometer and a vicinity thereof as a passband, andwherein the disturbance observer compensation unit has a characteristic of blocking a frequency band higher than a cutoff frequency which is set to be lower than the resonance frequency.

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