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Apparatus and method for determining the position of a work implement

  • US 5,951,613 A
  • Filed: 10/23/1996
  • Issued: 09/14/1999
  • Est. Priority Date: 10/23/1996
  • Status: Expired due to Term
First Claim
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1. An apparatus for determining a position of a work implement of a work machine in a site coordinate system, wherein the position of the work implement defined as the position in the site coordinate system of two fixed points located on the work implement, comprising:

  • a first position sensor mounted on the work implement for determining the position of the first position sensor and producing a first position signal;

    a second position sensor mounted on the work implement for determining the position of the second position sensor and producing a second position signal;

    a pitch sensor connected to the work implement for sensing a pitch of the work implement and responsively producing a pitch signal;

    a cross slope sensor connected to the work implement for sensing a cross slope of the work implement and responsively producing a cross slope signal;

    a rotation sensor connected to the work implement for sensing a rotation of the work implement and responsively producing a rotation sensor; and

    a controller, coupled to the first and second position sensors, the pitch sensor, the cross slope sensor and the rotation sensor, for receiving the first and second position, pitch, cross slope, and rotation signals, determining the position of the work implement in the site coordinate system as a function of either the first and second position signals and the pitch signal if the first and second position signals are valid, or by determining the position of the work implement in the site coordinate system as a function of one of the first and second position signals and the pitch, cross slope and rotation signals if one of the first and second position signals is not valid.

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