Method to decouple engine speed from hydraulic pump speed through an electric motor driven variator
AssigneeDeere & Company
InventorsEric Vilar, Jonathan Coulter
Life of this patent
Estimating the term…
Abstract
A work machine includes an engine for driving a primary working unit. At least one hydraulically powered auxiliary working unit is powered by a hydraulic pump. The engine and an electric motor both provide power to the hydraulic pump via a planetary gear set which sums the power inputs from the engine and the electric motor. The pump speed of the hydraulic pump is thereby decoupled from the engine speed of the engine.
Claims20
A work machine, comprising:
- an engine;
- a primary working unit;
- a drive train configured to transmit power from the engine to the primary working unit;
- at least one hydraulically powered auxiliary working unit;
- a hydraulic pump configured to power the at least one hydraulically powered auxiliary working unit;
- an electric motor;
- and
- a planetary gearset including a first power input connected to the engine, a second power input connected to the electric motor, and a power output connected to the hydraulic pump.
A method of operating a work machine, the work machine including an engine, a primary working unit, a drive train configured to transmit power from the engine to the primary working unit, at least one hydraulically powered auxiliary working unit, a hydraulic pump configured to power the at least one hydraulically powered auxiliary working unit, and an electric motor, the method comprising steps of:
- providing a first power input to a planetary gear set with the engine;
- providing a second power input to the planetary gear set with the electric motor;
- and
- summing the first power input and the second power input with the planetary gear set and providing a power output from the planetary gear set to the hydraulic pump.
Dependencies are inferred from the claim text.