Hystat transmission having pressure override control

Details Hystat transmission having pressure override control Hystat transmission having pressure override control

2011-04-19

2011-04-19

Leslie, Michael (Department: 3745)

Power plants

Pressure fluid source and motor

Input pump and rotary output motor system having...

C060S445000, C060S468000

Reexamination Certificate

active

07926267

ABSTRACT:
A transmission for use with a machine is disclosed. The transmission may have a pump, a motor fluidly connected to receive pressurized fluid from the pump and propel the machine, and an operator input device configured to generate a signal indicative of an operator desired gear ratio of the transmission. The transmission may also have a controller in communication with the pump, the motor, and the operator input device. The controller may be configured to determine an desired gear ratio of the transmission as a function of the signal, and determine an efficiency loss of the transmission at the desired gear ratio. The controller may also be configured to select a known setting of at least one of the pump and motor that provides the desired gear ratio and accounts for the efficiency loss.

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