Research on the controllability and energy saving of the pneumatic direct drive system

Abstract

Aiming at the problem of large air consumption in traditional circuits, this paper proposes a new type of pneumatic circuit, which uses the high-pressure gas produced by the actuator to achieve energy conservation. First, the directly-driven pneumatic circuit of the small-sized air compressor is designed, and the corresponding closed circuit experimental table is set up. Second, the mathematical model of the system is established, the input and output of the air compressor are fitted with the least square method, and the transfer function of the system is derived. Third, the transfer function of the system is determined through parameter identification of the small air compressor system, and the time response and frequency response characteristics of the system are analyzed. Finally, the fuzzy PID controller is designed and the simulation and speed control experiment of the system under different working conditions are carried out. The research shows that compared with traditional circuit, the directly driven system of small air compressor can save 70%-74% of air consumption.

A Review of Energy Overconsumption Reduction Methods in the Utilization Stage in Compressed Air Systems

“…However, the implementation of closed systems presents challenges such as compensating for air loss, incorporating cascade booster systems, integrating return pneumatic lines, and accounting for pressure losses. Du et al [81] introduced small closedcircuit pneumatic systems with a reduced pressure of 3 bar, claiming almost 75% energy savings, although their solution was tested with a single actuator. Challenges associated with such systems include the need for compensatory compressors, the use of cascade booster systems for compression ratios above 2-3, expanding the pneumatic network with return lines, addressing pressure losses, and considering compatibility issues with certain pneumatic tools.…”

Energy‐saving methods in pneumatic actuator stroke using compressed air

“…Du et al proposed a new type of closed pneumatic circuits, where an air compressor is connected to both the inlet and the outlet of the cylinder. By transferring the exhausted compressed air to the inlet directly, the system could save 70-74% of the air consumption [17]. In recent years, another method based on the bridge-type circuit and mathematical optimisation has been investigated.…”