Downshift in hydrostatic drive work machine

Details Downshift in hydrostatic drive work machine Downshift in hydrostatic drive work machine

2007-07-24

2007-07-24

Wright, Dirk (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Including fluid drive

Reexamination Certificate

active

11033796

ABSTRACT:
The present disclosure provides a hydrostatic drive work machine, and a method and control module having a control algorithm for performing a downshifting event in the work machine. The method includes the step of inducing a retarded mode in the work machine, if upon commanding a downshift the work machine is not in a retarded mode. The method further includes the steps of adjusting a displacement of each of a variable displacement pump and a variable displacement motor in a hydrostatic drive of the work machine, and increasing pressure on a low clutch of the work machine. The control algorithm includes means for inducing a retarded mode in the work machine, if the work machine is not in a retarded mode upon commanding a downshift, with at least one of a variable displacement motor and a variable displacement pump in a hydrostatic drive of the work machine.

REFERENCES:
patent: 5624339 (1997-04-01), Coutant et al.
patent: 6042502 (2000-03-01), Cronin et al.
patent: 6402660 (2002-06-01), Cronin et al.
patent: 2006/0150624 (2006-07-01), Shah
patent: 2006/0150809 (2006-07-01), Shah

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