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US 12,471,537 B2Granted
Hydraulic motor control system and method
AssigneeDeere & Company
InventorsSteven D. Wallestad, Mark A. Cracraft, James T. Noonan
Life of this patent
Estimating the term…
Abstract
An electrohydraulic system for a work machine includes a pump, a motor fluidly coupled to the pump, a subassembly driven by the motor, and a rate-control valve fluidly coupled to the pump and the motor. The rate-control valve is movable through a range of positions. A present speed of the motor is proportional to a present position of the rate-control valve. The present position of the rate-control valve is adjustable by varying a current supplied to the rate-control valve. The supply of current to the rate-control valve is adjusted based on the difference between the present speed of the motor and a target speed of the motor.
Claims18
A work machine comprising:
- a first pump;
- a first motor fluidly coupled to the first pump;
- a first subassembly coupled to and driven by the first motor;
- a first rate-control valve fluidly coupled to the first pump and the first motor and movable through a range of positions to adjust a flow rate to the first motor;
- a controller operatively coupled to the first rate-control valve and configured to output current-adjustment signals to the first rate-control valve to adjust a present position of the first rate-control valve;
- a primary motor engagement valve fluidly coupled to the first pump and the first motor;
- and
- a secondary motor engagement valve fluidly coupled to the first pump and the first motor and configured to move from a closed position to an open position in response to movement of the primary motor engagement valve to facilitate fluid flow to the first rate-control valve;
- wherein a speed of the first motor is proportional to the present position of the first rate-control valve.
6 more elements
A cotton harvester comprising:
- a pump;
- a motor fluidly coupled to the pump;
- a rotatable subassembly coupled to and rotatably driven by the motor, the rotatable subassembly being one of a feeder assembly and a beater assembly, each being configured to process harvested cotton;
- a rate-control valve fluidly coupled to the pump and the motor and movable through a range of positions to adjust a fluid flow rate to the motor;
- a primary motor engagement valve fluidly coupled to the pump and the motor;
- and
- a controller operatively coupled to the rate-control valve and the primary motor engagement valve;
- wherein the controller is configured output:
- a first set of one or more signals to:
- (i) the primary motor engagement valve causing movement of the primary motor engagement valve which facilitates fluid flow to the motor and (ii) the rate-control valve, and
- a second set of one or more signals to the rate-control valve causing movement of the rate-control valve to adjust the fluid flow rate to the motor.
8 more elements
A work machine comprising:
- a first pump;
- a first motor fluidly coupled to the first pump;
- a first subassembly coupled to and driven by the first motor;
- and
- a first rate-control valve fluidly coupled to the first pump and the first motor and movable through a range of positions to adjust a flow rate to the first motor;
- wherein a speed of the first motor is proportional to a present position of the first rate-control valve;
- wherein the first rate-control valve is normally biased toward an open position;
- and
- wherein the first motor and the first rate-control valve are arranged in parallel to one another.
6 more elements
A work machine comprising:
- a first pump;
- a first motor fluidly coupled to the first pump;
- a first subassembly coupled to and driven by the first motor;
- a first rate-control valve fluidly coupled to the first pump and the first motor and movable through a range of positions to adjust a flow rate to the first motor;
- a controller operatively coupled to the first rate-control valve and configured to output current-adjustment signals to the first rate-control valve to adjust a present position of the first rate-control valve;
- and
- a primary motor engagement valve fluidly coupled to the first pump and the first motor;
- wherein the controller is operatively coupled to the primary motor engagement valve and configured to output a first signal to the primary motor engagement valve, prior to outputting the current-adjustment signals, to cause movement of primary motor engagement valve which facilitates fluid flow to the first motor;
- and
- wherein prior to movement of the primary motor engagement valve fluid flow is not permitted to the first motor.
7 more elements
Dependencies are inferred from the claim text.