Hydromechanical transmission and control method
AssigneeDana Italia S.R.L.
InventorsLorenzo DALLA PALMA, Claudio ANGELONI
Life of this patent
Estimating the term…
Abstract
Methods and systems for a hydromechanical transmission in a vehicle are provided herein. In one example, the transmission system includes a hydrostatic assembly with a hydraulic pump in fluidic communication with a hydraulic motor. The transmission system further includes a controller configured to selectively transition between a torque control mode and a speed control mode of the hydrostatic assembly while the vehicle is on a slope.
Claims20
A hydromechanical transmission system for a vehicle, comprising:
- a hydrostatic assembly comprising a hydraulic pump in fluidic communication with a hydraulic motor;
- and
- a controller including:
- instructions that when executed, while the vehicle is on a slope, cause the controller to:
- selectively transition between a torque control mode and a speed control mode of the hydrostatic assembly.
A method for operation of a transmission system, comprising:
- operating a hydrostatic assembly in a speed control mode;
- while the hydrostatic assembly is operated in the speed control mode, beginning simultaneous engagement of two or more clutches to mechanically hold an output of the transmission system in a stationary state;
- and
- responsive to the achieving the simultaneous engagement of the two or more clutches, switching to a torque control mode of the hydrostatic assembly and reducing a differential pressure in the hydrostatic assembly.
A hydromechanical variable transmission of a vehicle, comprising:
- a hydrostatic assembly including a variable displacement hydrostatic pump and a hydrostatic motor;
- and
- a controller including:
- instructions that when executed, while the vehicle is on a slope, cause the controller to:
- coordinate operation of the hydrostatic assembly in a torque control mode and a speed control mode to hold the vehicle in a standstill condition.
Dependencies are inferred from the claim text.