An Investigation on the Ball Screw-Based Variable Displacement Mechanism for Axial Piston Pumps with Feedforward...

Area of Science:

• Mechanical Engineering
• Hydraulic Systems
• Control Systems

Background:

• Traditional valve-controlled cylinder variable mechanisms (VCCVM) in axial piston pumps exhibit limited swash plate control precision due to system uncertainties.
• Precise control of actuator position and velocity is crucial for displacement-controlled (DC) systems.

Purpose of the Study:

• To propose and validate a novel variable mechanism structure using a ball screw for enhanced displacement control in axial piston pumps.
• To improve the accuracy and responsiveness of swash plate control in DC systems.

Main Methods:

• Replaced the conventional valve-controlled cylinder with a ball screw mechanism for swash plate actuation.
• Developed a coupled mechanical-hydraulic dynamic model for the Ball Screw Variable Mechanism (BSVM).
• Designed a controller based on the dynamic model to optimize system performance.

Main Results:

• Experimental and simulation results validated the effectiveness of the BSVM.
• The proposed design demonstrated significant improvements in control precision.
• Enhanced accuracy and responsiveness in actuator position and velocity control were achieved.

Conclusions:

• The ball screw variable mechanism offers a superior solution for precise displacement control in axial piston pumps.
• The developed dynamic model and control strategy effectively enhance system performance.
• The BSVM presents a promising advancement for DC systems requiring high-precision actuation.