Digital Control Method and Performance Analysis of the Double-Compound Axial Piston Pump.

Area of Science:

• Engineering
• Fluid Mechanics
• Control Systems

Background:

• Traditional mechanical-hydraulic feedback servo control for double-compound axial piston pumps exhibits limited flow control range and poor accuracy.
• Precise control and cooperative operation of double pumps are crucial for efficient performance.

Purpose of the Study:

• To propose and validate a digital control scheme and strategy for double-compound axial piston pumps using a linear stepper motor direct drive servo valve.
• To enhance flow control precision, enable double pump cooperation, and improve overall system performance.

Main Methods:

• Development of a numerical model for the digital control double-compound axial piston pump.
• Experimental verification of the numerical model's validity.
• Analysis of digital control advantages over traditional methods and evaluation of the double pump control strategy.

Main Results:

• The digital control method achieves a wider flow control range compared to traditional mechanical-hydraulic feedback servo control.
• The proposed digital control avoids torque impact on the prime mover.
• The control strategy, integrating flow and power control with four modes, meets performance requirements, prioritizing energy saving.

Conclusions:

• Digital control offers superior performance for double-compound axial piston pumps, enhancing flow control and energy efficiency.
• The developed control strategy optimizes power matching to load and flow to speed.
• This research provides a foundation for accurate matching and optimization in axial piston pump systems.