Variable displacement pumps
AssigneeHamilton Sundstrand Corporation
InventorsMatej Rutar, Morgan O'Rorke, Ryan Shook, Ryan Susca
Life of this patent
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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.
Claims19
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 bias pressure line;
- a controllable valve disposed in the bias pressure line configured to meter a pressure of the bias pressure line;
- a pressure actuated main piston disposed in the bias pressure line upstream of the controllable valve configured to control displacement of a variable displacement pump at a predetermined pressure set point;
- a biasing member operatively connected to the pressure actuated main piston and configured to bias the main piston to a position to achieve a pressure output for the predetermined pressure set point;
- and
- a pressure actuated biasing piston operatively connected to the biasing spring configured to bias the pressure actuated main piston.
A control system for a variable displacement pump, comprising:
- one or more sensors operatively connected to sense a position of one or more of a mechanical linkage operatively connected to a variable displacement pump, a pressure actuated main piston in a bias pressure line, and/or a pressure actuated bias piston operatively connected to the pressure actuated main piston via a biasing member;
- and
- a controller operatively connected to receive one or more signals indicative of the position of one or more of the mechanical linkage of the variable displacement pump, the pressure actuated main piston in a bias pressure line, and/or the pressure actuated bias piston and configured to control a controllable valve disposed in the bias pressure line to control displacement of the variable displacement pump based at least in part the indicative signals.
A method for controlling a variable displacement pump, comprising:
- porting a portion of a high pressure fluid from a main line to a bias pressure line;
- metering the high pressure fluid in the bias pressure line with a controllable valve to control a bias pressure supplied to a bias piston;
- and
- adjusting a position of the bias piston to control a predetermined pressure set point for a variable displacement pump disposed in the main line to change a displacement of the variable displacement pump.
Dependencies are inferred from the claim text.