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.
Claims14
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 electric 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 electric motor;
- and
- 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, wherein the scalar value includes at least one of a pressure scalar value or a flow scalar value, wherein at least one of the flow scalar value or the pressure scalar value is multiplied by a value generated from the lookup table;
- and
- wherein the lookup table is a first lookup table and wherein one of the flow scalar value or the pressure scalar is stored in a second lookup table or in memory as a predetermined value.
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 electric 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 electric motor;
- and
- 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;
- wherein a scalar value proportionally scales a rated power of the fluid pump, the scalar value includes at least one of a pressure scalar value or a flow scalar value, wherein at least one of the flow scalar value or the pressure scalar value is multiplied by a value generated from the first lookup table, and wherein the flow scalar value and/or the pressure scalar value is stored in a second lookup table or in memory as a predetermined value.
Dependencies are inferred from the claim text.