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Sonic ranging grade level controller

  • US 5,365,442 A
  • Filed: 10/21/1991
  • Issued: 11/15/1994
  • Est. Priority Date: 10/21/1991
  • Status: Expired due to Fees
First Claim
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1. A method of controlling the position of an implement in relationship to a surface, comprising the steps of:

  • (a) selecting a desired relationship between the implement and the surface;

    (b) emitting a sonic wave;

    (c) detecting echoes produced by the reflection of the sonic wave from the surface; and

    (d) generating a correction signal which causes the implement to alter its relationship to the surface if a difference between a desired distance and a measured distance exceeds a certain amount, wherein a transfer function defining a relationship between the difference and the correction signal magnitude is linear.

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