Integrated hybrid power system for work vehicle
AssigneeDeere & Company
InventorsJeffrey L. Lubben, Andrew K. Rekow
Life of this patent
Estimating the term…
Abstract
An integrated hybrid power system for a work vehicle includes an engine and an electric machine. The power system also includes a transmission configured to transfer mechanical power between the engine and the electric machine. The transmission, in a first configuration, is configured to transfer mechanical power in a first direction from the electric machine to the engine to start the engine. Furthermore, the transmission, in a second configuration, is configured to transfer mechanical power in the first direction and, alternatively, in a second direction from the engine to the electric machine after the engine is started.
Claims17
An integrated hybrid power system for a work vehicle comprising:
- an engine;
- an electric machine;
- and
- a transmission including a planetary gear set with a first gear, a second gear, and a third gear and a selective transmission component having a disengaged position and an engaged position, the transmission configured to transfer mechanical power between the engine and the electric machine;
- the transmission, in a first configuration and the selective transmission component in the disengaged position to allow relative rotation of each of the first gear, the second gear, and the third gear, configured to transfer mechanical power in a first direction from the electric machine to the engine to start the engine;
- and
- the transmission, in a second configuration and the selective transmission component in the engaged position to rotationally fix together two of the first gear, the second gear, and the third gear, configured to transfer mechanical power in the first direction and, alternatively, in a second direction from the engine to the electric machine after the engine is started.
A method of operating an integrated hybrid power system of a work vehicle that includes a transmission that is disposed between an engine and an electric machine, the transmission including a planetary gear set with a first gear, a second gear, and a third gear and a selective transmission component having a disengaged position and an engaged position, the method comprising:
- operating, with the transmission in a first configuration and the selective transmission component in the disengaged position to allow relative rotation of each of the first gear, the second gear, and the third gear, the electric machine as a motor to transfer mechanical power in a first direction through the transmission from the electric machine to the engine to start the engine;
- and
- changing the transmission from the first configuration to a second configuration and the selective transmission component to the engaged position to rotationally fix together two of the first gear, the second gear, and the third gear for allowing power transfer in the first direction and, alternatively, in a second direction from the engine to the electric machine after the engine is started.
A work vehicle comprising:
- an internal combustion engine;
- an electric machine;
- and
- a transmission including:
- a planetary gear set with a first gear, a second gear, and a third gear;
- a selective transmission component having a disengaged position and an engaged position;
- a first driveline component;
- and a second driveline component arranged in series with the first driveline component between the internal combustion engine and the electric machine, the transmission configured to transfer mechanical power between the engine and the electric machine, the first driveline component having a fixed drive ratio, the second driveline component having a variable drive ratio;
- the second driveline component, when the transmission is in a first configuration and the selective transmission component is in the disengaged position to allow relative rotation of each of the first gear, the second gear, and the third gear, configured to provide a gear reduction to the transmission for transferring mechanical power in a first direction from the electric machine to the engine to start the engine;
- and
- the second driveline component, when the transmission is in a second configuration and the selective transmission component is in the engaged position to rotationally fix together two of the first gear, the second gear, and the third gear, configured to provide a direct drive allowing the transmission to transfer mechanical power in the first direction and, alternatively, in a second direction from the engine to the electric machine after the engine is started.
Dependencies are inferred from the claim text.