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US 12,071,942 B2Granted
Variable displacement pumps
AssigneeHamilton Sundstrand Corporation
InventorMatej Rutar
Life of this patent
Estimating the term…
Abstract
In accordance with at least one aspect of this disclosure, a variable displacement pump system can include, a variable displacement pump disposed in a main line and configured to supply pressure to receive a low pressure fluid and to output a high pressure fluid. The main line can connect a hydraulic fluid source to a plurality of system actuators, where the variable displacement pump is disposed in the main line between the hydraulic fluid source and the plurality of system actuators to pressurize the hydraulic fluid.
Claims14
A variable displacement pump system, comprising:
- a variable displacement pump disposed in a main line and configured to receive a low
- pressure fluid and to output a high pressure fluid;
- a pressure port disposed in the main line downstream of the variable displacement pump configured to port a portion of the high pressure fluid from the main line to a bypass line;
- a pressure regulating valve disposed in the bypass line configured to bypass the portion of the high pressure fluid from the main line to control a pressure of the main line based on an adjustable regulating set point of the pressure regulating valve;
- a first controllable valve operatively connected to a metering mechanism disposed in a secondary branch of the main line upstream of the pressure port configured to modulate a pressure of the secondary branch to control the adjustable regulating set point of the pressure regulating valve;
- a mechanical linkage operatively connected to the variable displacement pump configured to
- be driven by a pressure actuated piston to control displacement of the variable displacement pump;
- a second controllable valve operatively connected to the pressure actuated piston configured to supply a fluid pressure to adjust the position of the piston;
- one or more sensors operatively connected to sense at least one of a position of the pressure regulating valve and/or a pressure of the main line and configured to output a respective signal indicative of the position of the pressure regulating valve and/or the pressure of the main line;
- and
- a controller operatively connected to receive at least one of the signal indicative of the position of the pressure regulating valve and/or the pressure of the main line, wherein the controller includes machine readable instructions configured to cause the controller to:
- control at least one of the first and/or second controllable valves to achieve the adjustable regulating set point of the pressure regulating valve;
- and
- adjust a position of the pressure actuated piston to drive the mechanical linkage, varying displacement of the variable displacement pump based on at least one of the signal indicative of the position of the pressure regulating valve and/or the pressure of the main line.
11 more elements
A control system for a variable displacement pump, comprising:
- one or more sensors configured to sense one or more of a pressure of a main line, a position of a mechanical linkage operatively connected to the variable displacement pump disposed in the main line, and/or a position of a pressure regulating valve disposed in a bypass line downstream of the variable displacement pump;
- and
- a controller operatively connected to the one or more sensors and configured to receive one or more signals from the one or more sensors indicative of the pressure of the main line, the position of the mechanical linkage operatively connected to the variable displacement pump, and/or the position of the pressure regulating valve,
- wherein the controller includes machine readable instructions configured to cause the controller to:
- control one or more operatively connected controllable valves to control at least one of:
- displacement of the variable displacement pump and/or an adjustable regulating set point of the pressure regulating valve based at least in part on the respective signals indicative of the pressure of the main line, the position of the mechanical linkage operatively connected to the variable displacement pump, and/or the position of the pressure regulating valve, and control an output pressure set point of the variable displacement pump based on the adjustable regulating set point of the pressure regulating valve.
3 more elements
A control system for a variable displacement pump, comprising:
- one or more sensors configured to sense one or more of a pressure of a main line, a position of a mechanical linkage operatively connected to the variable displacement pump, the variable displacement pump being disposed in the main line, and/or a position of a pressure regulating valve disposed in a bypass line downstream of the variable displacement pump;
- and
- a controller operatively connected to the one or more sensors and configured to receive one or more signals from the one or more sensors indicative of the pressure of the main line, the position of the mechanical linkage operatively connected to the variable displacement pump, and/or the position of the pressure regulating valve,
- wherein the controller includes machine readable instructions configured to cause the controller to:
- control one or more operatively connected controllable valves to control at least one of:
- displacement of the variable displacement pump and/or an adjustable regulating set point of the pressure regulating valve based at least in part on the respective signals indicative of the pressure of the main line, the position of the mechanical linkage operatively connected to the variable displacement pump, and/or the position of the pressure regulating valve;
- a variable metering orifice in a secondary branch of the main line and operatively connected to the one or more operatively connected controllable valves;
- and
- a fixed metering orifice in the secondary branch downstream from the variable metering orifice and in series with the variable metering orifice, and
- wherein the controller includes machine readable instructions configured to cause the controller to:
- modulate the pressure in the secondary branch and thereby adjust the adjustable regulating set point of the pressure regulating valve by controlling the one or more operatively connected controllable valves to adjust the variable metering orifice.
8 more elements
Dependencies are inferred from the claim text.