×

Rotation angle detection device and electric power steering system using the same

  • US 20120078560A1
  • Filed: 09/13/2011
  • Published: 03/29/2012
  • Est. Priority Date: 09/23/2010
  • Status: Active Grant
First Claim
Patent Images

1. A rotation angle detection device comprising:

  • a sensor circuit including a plurality of sensor element pairs, each of which is formed of sensor elements and senses a rotating magnetic field varying with rotation of a detection target and changes impedance in accordance with a rotation angle of the detection target;

    a control circuit including an output signal acquisition section for acquiring output signals produced by the plurality of sensor element pairs individually, a pre-correction rotation angle calculation section for calculating a pre-correction rotation angle of the detection target based on the output signals acquired by the output signal acquisition section, and a correction section for correcting the pre-correction rotation angle calculated by the pre-correction rotation angle calculation section by correction values; and

    a memory circuit for storing the correction values, whereinthe control circuit further includes a phase correction value calculation section for calculating phase correction values, as the correction values, for correcting phase deviations between the output signals based on the output signals acquired by the output signal acquisition section,the correction section corrects the pre-correction rotation angle by the phase correction values stored in the memory circuit, andthe output signal acquisition section acquires the output signals, which are a plurality of signals of different phases.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×