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Automatic Shift Control System for a Powertrain and Method

  • US 20140095036A1
  • Filed: 10/23/2012
  • Published: 04/03/2014
  • Est. Priority Date: 09/28/2012
  • Status: Active Grant
First Claim
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1. A machine, comprising an implement being liftable at a height and tiltable at an orientation, a transmission arranged to interconnect a prime mover of the machine with ground engaging members of the machine at a selectively variable ratio such that the machine can travel along a travel surface at a ground speed, the machine comprising:

  • a control device associated with the transmission and responsive to selectively vary the selectively variable ratio in response to a shift signal;

    a lift sensor associated with the implement, the lift sensor configured to monitor a parameter indicative of a position of the implement with respect to the travel surface and provide a lift signal indicative of the position;

    a ground speed sensor configured to monitor the ground speed of the machine and provide a ground speed signal indicative of the ground speed;

    a controller associated with the control device, the lift sensor, and the ground speed sensor, the controller disposed to;

    monitor the lift signal and the ground speed signal;

    compare the lift signal to a predetermined position range;

    compare the ground speed signal to a predetermined ground speed range; and

    when the ground speed signal is within the predetermined ground speed range and the lift signal is within the predetermined position range, provide a shift signal to the control device, which shift signal causes the selectively variable ratio of the transmission to change.

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