Hand wheel position detection system

  • US 9,254,869 B2
  • Filed: 07/20/2012
  • Issued: 02/09/2016
  • Est. Priority Date: 12/23/2011
  • Status: Active Grant
First Claim
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1. A steering system for detecting a hand wheel position, comprising:

  • an input shaft connected to a hand wheel;

    a main gear disposed around the input shaft;

    a puck gear meshingly engaged with the main gear; and

    a control module, implemented in a hardware processor, for;

    receiving an angular main position of the main gear and an angular puck position of the puck gear;

    setting an empirical value equal to c1- 1/G c2, wherein c1 is the angular main position, c2 is the angular puck position, an G is the gear ratio;

    finding a number of rotations of the input a number of rotations of the puck gear using the empirical value;

    calculating a first hand wheel position based on the number of rotations of the input shaft;

    calculating a second hand wheel position based on the number of rotations of the puck gear; and

    determining that the first hand wheel position is incorrect if a difference between the first hand wheel position and the second wheel position is above a threshold value.

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