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Device and method for calculating absolute amount of displacement, and method for same

  • US 9,841,947 B2
  • Filed: 06/28/2012
  • Issued: 12/12/2017
  • Est. Priority Date: 07/12/2011
  • Status: Active Grant
First Claim
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1. A system for determining an absolute amount of displacement of a moving body, the system comprising:

  • a displacement detection mechanism configured to detect displacement amounts, the displacement detection mechanism comprising multiple sensors configured to detect the displacement amounts and a transmission mechanism comprising a main shaft configured to move rotationally, a first countershaft configured to receive a rotation of the main shaft transmitted at a first transmission gear ratio, and a second countershaft configured to receive the rotation of the main shaft transmitted at a second transmission gear ratio; and

    an absolute displacement detection device configured to receive a plurality of displacement detections signals from the multiple sensors and configured to calculate an absolute periodic signal based on the plurality of displacement detection signals provided by the multiple sensors;

    wherein;

    the main shaft is coupled to a shaft of a rotary drive source;

    the moving body comprises the shaft of the rotary drive source;

    the multiple sensors comprise;

    a first angle sensor configured to detect a first amount of displacement of the main shaft;

    a second angle sensor configured to detect a second amount of displacement of the first countershaft; and

    a third angle sensor configured to detect a third amount of displacement of the second countershaft;

    the main shaft is equipped with the first angle sensor;

    the first countershaft is equipped with the second angle sensor;

    the second countershaft is equipped with the third angle sensor;

    the displacement amounts comprise the first amount of the displacement of the main shaft, the second amount of the displacement of the first countershaft, and the third amount of the displacement of the second countershaft;

    the absolute periodic signal has an absolute periodic signal period larger than displacement detection signal periods of the plurality of the displacement detection signals; and

    the absolute displacement detection device comprises;

    a first computation module configured to run at one or more processors and to generate, from the plurality of the displacement detection signals, a first periodic signal having a first period and a second periodic signal having a second period different than the first period, the first periodic signal and the second periodic signal being digitized with a common base unit amount and being changed in synchronization;

    a second computation module configured to run at the one or more processors and to calculate a first residue by dividing (i) a difference between a value resulting from multiplying the first periodic signal by a first coefficient and a value resulting from multiplying the second periodic signal by a second coefficient by (ii) a common multiple of the first period and the second period, the first coefficient being a value resulting from dividing the common multiple by the first period, and the second coefficient being a value resulting from dividing the common multiple by the second period;

    a third computation module configured to run at the one or more processors and to calculate a second residue by dividing the first residue by a difference between the first coefficient and the second coefficient; and

    a fourth computation module configured to run at the one or more processors and to calculate a value resulting from adding to the first residue, a value resulting from multiplying the second residue by the common multiple.

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