Electronic Pressure Compensated Hydraulic Motor Pump with Variable Output Power
AssigneeEaton Intelligent Power Limited
InventorsStephen Marshall Devan, Kelly Dale Valtr, Joshua Boone Pepper
Life of this patent
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Abstract
An electronic pressure compensated hydraulic motor pump is controlled to provide variable output power based on a variable input signal. The variable output power feature allows the motor pump to be used with a power management system to better match the output power of the motor pump with the available power of an electrical system. The ability to provide variable output power provides beneficial power management for electrical systems that switch between different power modes, e.g., between a generator power mode and a battery power mode.
Claims20
A fluid device system comprising:
- a) a fluid pump having a fluid inlet and a fluid outlet, the fluid pump having a fixed displacement;
- b) an electric motor having a shaft coupled to the fluid pump, the electric motor being adapted for rotation in response to a power command signal;
- and
- c) a controller including an output to communicate the power command signal to the electric motor and including a first input for receiving a first input value, the controller being adapted to adjust the power command signal to operate the electrical motor in a normal operating mode and an input control operating mode:
- i) in the normal operating mode, the controller refers to a lookup table using the first input value and outputs a first power command signal to the electrical motor;
- ii) in the input control operating mode, the controller calculates a second power command signal based on a scalar value such that the fluid pump is operated at a reduced capacity in comparison to the normal operating mode.
A fluid device system comprising:
- a) a fluid pump having a fluid inlet and a fluid outlet, the fluid pump having a fixed displacement;
- b) an electric motor having a shaft coupled to the fluid pump, the electric motor being adapted for rotation in response to a power command signal;
- and
- c) a controller including an output to communicate the power command signal to the electric motor and including a first input for receiving a first input value, the controller being adapted to adjust the power command signal to operate the electrical motor in a normal operating mode and an input control operating mode:
- i) in the normal operating mode, the controller refers to a first lookup table using the first input value and outputs a first power command signal to the electrical motor;
- ii) in the input control operating mode, the controller calculates a second power command signal such that the fluid pump is operated at a reduced capacity in comparison to the normal operating mode.
A method of controlling a fluid device system having a fixed displacement fluid pump, an electric motor having a rotational shaft coupled to the fluid pump, and a controller including an output to communicate a command signal to the electric motor, the method comprising:
- receiving at the controller an input directing operation in either a normal operating mode or an input control operating mode;
- in response to an input directing operation in a normal mode, receiving a first input value at the controller, using the first input value to reference a first output value in a lookup table of the controller, and outputting from the controller a first power command signal that corresponds to the first output value to the electrical motor;
- and
- in response to an input directing operation in an input control operating mode, receiving a scalar value at the controller, scaling at the controller at least a portion of the content of the lookup table with the scalar value, receiving a second input value at the controller, using the second input value to reference a second output value in the scaled lookup table, and outputting from the controller a second power command signal that corresponds to the second output value to the electrical motor.
Dependencies are inferred from the claim text.