Control units of electro-hydraulic double-axial folding machine can be classified as throttling type (valve-controlled) and volumetric type (pump-controlled). This paper focuses to compare their control performances. Valve-controlled folding machine (VCFM) has higher supply pressure, different circuit resistance between subsystems. Pump-controlled folding machine (PCFM) has variable working pressure and circuit resistance is slightly different. The folding machine is a coupled system and has significant structural interaction. This paper proposes coupled adaptive self-organizing sliding-mode fuzzy controllers to improve folding machine’s level control performance. It found higher supply pressure of VCFM cause faster transient response, larger maximum overshoot via a variety of coupled intensity synchronous level control experiments. Experimental results indicate that their transient and steady state responses are similar, but pump-controlled folding machine has better level control accuracy than valve-controlled folding machine
Wong, Ray-Hwa and Wong, Wei-Heng
"COMPARISONS OF POSITION CONTROL OF VALVE-CONTROLLED AND PUMP-CONTROLLED FOLDING MACHINES,"
Journal of Marine Science and Technology: Vol. 26:
1, Article 6.
Available at: https://jmstt.ntou.edu.tw/journal/vol26/iss1/6