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GNSS based control for dispensing material from vehicle

  • US 8,634,993 B2
  • Filed: 08/25/2011
  • Issued: 01/21/2014
  • Est. Priority Date: 03/20/2003
  • Status: Expired
First Claim
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1. A spray control method for controlling spraying of a material on a spray zone of a field also including an exclusion zone which is not to receive said material, said spray zone being separated from said exclusion zone by a spray turn-on boundary when passing from said exclusion zone to said spray zone and by a spray turn-off boundary when passing from said spray zone to said exclusion zone;

  • said method employing a spray vehicle including a material tank, a pump communicating with said tank, and a nozzle communicating with said pump, said pump when activated causing said material to be sprayed from said nozzle to a spray range from said nozzle and requiring a turn-on lag time between activation of said pump and said material reaching said spray range and a turn-off lag time between deactivation of said pump and cessation of said material being sprayed from said nozzle, said vehicle having a GNSS receiver mounted thereon at an offset distance from said nozzle and outputting position data representing a position of said receiver, said receiver being interfaced to a controller which is interfaced to said pump, said controller selectively activating said pump and having data representing said turn-on boundary and said turn-off boundary stored therein, and said method comprising the steps of;

    (a) moving said vehicle in said exclusion zone toward said turn-on boundary at a vehicle velocity;

    (b) communicating position data from said receiver to said controller to track the position of said receiver;

    (c) activating said pump by said controller when said receiver detects a position of said receiver within said spray zone at a spray turn-on distance beyond said turn-on boundary equal to the sum of said offset distance plus said spray range minus the product of said vehicle velocity times said turn-on lag time;

    (d) moving said vehicle in said spray zone toward said turn-off boundary; and

    (e) deactivating said pump by said controller when said receiver detects a position of said receiver within said exclusion zone at a spray turn-off distance beyond said turn-off boundary equal to said offset distance minus the product of said vehicle velocity times said turn-off lag time.

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