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Modeling of Digital-Displacement Pump-Motors and Their Application as Hydraulic Drives for Nonuniform Loads
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1997
Year
Electric MachineEngineeringFlow ControlEnergy EfficiencyMotor DriveMechanical EngineeringResponse SpeedHybrid DeviceHydraulic DrivesDigital-displacement Pump-motorsElectrical DriveSystems EngineeringFluid PowerPump EngineeringNonuniform LoadsMechatronicsDigital-displacement Pump-motorPropulsionFluid MachineryEnergy Efficient DrivePneumaticsMechanical SystemsProcess ControlFeed Forward (Control)
The digital‑displacement pump‑motor is a hybrid device combining reciprocating hydraulics with micro‑processor control, enabling variable flow and power. It builds on a conventional hydraulic piston pump but uses actively controlled poppet valves for each cylinder, allowing stroke‑by‑stroke enable/disable in any sequence, and its time‑domain model predicts performance under variable demand and speed across control modes. This approach offers faster response and higher energy efficiency than conventional techniques. S0022-0434(00)00801-7.
The digital-displacement pump-motor is a hybrid device, which combines reciprocating hydraulics with micro-processor control, creating a highly integrated machine capable of producing variable flow and power. It is based on the conventional hydraulic piston pump but with actively controlled poppet valves for each cylinder. This allows enabling or disabling on a stroke-by-stroke basis in any desired sequence. Time-domain modeling of the pump-motor system predicts the performance under variable-demand, variable-speed at different control-modes. The advantages of this approach over conventional techniques lie with both the response speed and the inherent energy efficiency. [S0022-0434(00)00801-7]