US 12,404,846 B2
Electronic pressure compensated hydraulic motor pump with variable output power
Stephen Marshall Devan, Madison, MS (US); Kelly Dale Valtr, Aurora, TX (US); and Joshua Boone Pepper, Madison, MS (US)
Assigned to Eaton Intelligent Power Limited, Dublin (IE)
Filed by Eaton Intelligent Power Limited, Dublin (IE)
Filed on Sep. 21, 2022, as Appl. No. 17/933,978.
Claims priority of provisional application 63/246,366, filed on Sep. 21, 2021.
Prior Publication US 2023/0102332 A1, Mar. 30, 2023
Int. Cl. F04B 17/03 (2006.01); F04B 49/06 (2006.01); F04B 49/20 (2006.01); H02P 4/00 (2006.01); H02P 6/06 (2006.01); F04B 1/20 (2020.01)
CPC F04B 17/03 (2013.01) [F04B 49/065 (2013.01); F04B 49/20 (2013.01); H02P 4/00 (2013.01); H02P 6/06 (2013.01); F04B 1/20 (2013.01); F04B 2201/1201 (2013.01); F04B 2203/0201 (2013.01); F04B 2203/0202 (2013.01); F04B 2203/0208 (2013.01); F04B 2203/0209 (2013.01); F04B 2205/05 (2013.01); F04B 2205/06 (2013.01); F04B 2205/09 (2013.01); Y02T 50/80 (2013.01)] 14 Claims
OG exemplary drawing
 
1. 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.