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US 10,569,776 B2Granted
Hydraulic control system
AssigneeDeere & Company
InventorAndy B. Appleton
Life of this patent
Estimating the term…
Abstract
A tractor includes an engine, a transmission coupled to the engine, a hydraulic pump driven by the engine, at least one of a tractor implement, attachment, or control moved by the hydraulic pump, a sensor, and a controller coupled to the transmission. The controller is configured to downshift the transmission based on a signal from the sensor.
Claims14
A tractor comprising:
- an engine;
- a transmission coupled to the engine;
- a hydraulic pump driven by the engine;
- at least one of a tractor implement, attachment, or control movable by the hydraulic pump;
- a sensor configured to detect an angle of a swashplate in the hydraulic pump;
- and
- a controller coupled to the transmission, wherein the controller is configured to downshift the transmission based on a first signal received from the sensor indicating the hydraulic pump is approaching a maximum pump displacement and is configured to upshift the transmission based on a second signal received from the sensor indicating the angle of the swashplate has fallen below a predetermined angle.
4 more elements
A swashplate pump assembly comprising:
- a swashplate pump having a pump housing and a swashplate disposed within the pump housing;
- a sensor disposed within the housing and configured to detect an angle of the swashplate;
- and
- a controller configured to downshift a transmission disposed within a tractor based on a first signal received from the sensor indicating the angle of the swashplate has reached a first predetermined angle and to upshift the transmission based on a second signal received from the sensor indicating the angle of the swashplate has fallen below a second predetermined angle.
1 more element
A control system for adjusting a transmission on a tractor, the control system comprising:
- a memory;
- and
- a processor, wherein the processor is configured to receive a first signal from a sensor and to determine whether a hydraulic pump is approaching a maximum pump displacement based on the first signal, wherein the processor is further configured to send a second signal to a transmission to cause the transmission to downshift if the processor determines that the hydraulic pump is approaching the maximum pump displacement, and wherein the processor is configured to send a third signal to the transmission if the processor determines that an angle of a swashplate has fallen below a predetermined angle, the third signal configured to cause the transmission to upshift.
Dependencies are inferred from the claim text.