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Anti-stall transmission control for utility vehicle

  • US 6,675,577 B2
  • Filed: 07/13/2001
  • Issued: 01/13/2004
  • Est. Priority Date: 07/13/2001
  • Status: Expired due to Fees
First Claim
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1. An engine control system for a compact utility tractor having an engine coupled to a hydrostatic transmission, that is coupled to a driven wheel, comprising:

  • a controller;

    an engine speed sensor, signal-connected to said controller to send an actual engine speed signal to said controller;

    a speed control actuator having at least a forward and a neutral position, said speed control actuator causing speed command signals from said controller to adjust said hydrostatic transmission speed output to said wheel;

    said controller having circuitry that continuously monitors engine speed and the position of said control actuator;

    said controller having circuitry that records said engine speed at the occurrence of said neutral position of said speed control actuator as an unloaded engine speed; and

    when the engine speed signal decreases under load by a specified amount below said unloaded engine speed, said controller having circuitry that sends a control command to said hydrostatic transmission to reduce tractor speed proportional to the difference between said unloaded engine speed and said actual engine speed signal.

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