US 12,078,157 B2
Variable displacement piston pump with electronic control unit to provide direct metering control
Weishun Willaim Ni, Rockton, IL (US); Edward W. Goy, Crystal Lake, IL (US); Benjamin T. Harder, Sycamore, IL (US); and Mark W. Shoemaker, Pecatonica, IL (US)
Assigned to HAMILTON SUNDSTRAND CORPORATION, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on Dec. 27, 2021, as Appl. No. 17/562,214.
Prior Publication US 2023/0204029 A1, Jun. 29, 2023
Int. Cl. F04B 1/328 (2020.01); F02C 9/30 (2006.01); F04B 49/06 (2006.01); F04B 13/00 (2006.01)
CPC F04B 1/328 (2013.01) [F02C 9/30 (2013.01); F04B 49/06 (2013.01); F04B 13/00 (2013.01); F04B 2201/12051 (2013.01); F04B 2205/02 (2013.01); F04B 2205/05 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A direct metering control variable displacement piston pump, comprising:
a pump housing defining a housing cavity, a pivot assembly configured to pivot within the pump housing between minimal and maximum pivot angles;
a pump cover disposed against the pump housing, the pump cover defining an actuator bore, an actuator piston in the actuator bore, an actuator arm extending from the actuator piston to the pivot assembly; and
an electronic control unit (ECU) operationally coupled to the pump, the ECU comprising: a pump controller, a linear variable differential transducer (LVDT) operationally coupled to the pump controller and the actuator piston, and an electrohydraulic solenoid valve (EHSV) operationally coupled to the pump controller,
wherein the ECU is configured to:
determine parameters indicative of a pivot assembly angle;
control the EHSV to thereby move the actuator piston; and
determine, from the LVDT, that the actuator piston moved;
the ECU is further configured to: monitor to identify pressure perturbations in the pump resulting from pressure changes to a fluid flow; and react to pressure perturbations in the pump with controlled metered movement of the actuator piston; and
the pump cover further includes: an inlet port and an inlet passage that extends from the inlet port to the pump housing; an outlet port and an outlet passage that extends from the outlet port to the EHSV and to the pump housing; a return passage that extends from the EHSV to the pump housing; and a coupling passage that extends between the actuator bore and the EHSV.