Abstract
Shaw’s et al. show an excellent idea and did substantial investigations on Pneumatic-Hydraulic (PH) system in which compressed gas pumps finite amount of liquid cyclically back and forth between pneumatic-hydraulic energy converters, and the liquid drives the hydraulic motor. Extended analysis was performed, and it was revealed that this system has a considerable potential in field of application, design and control. Extension of original design was proposed. Beside individual steering of particular valve, the extension also includes valves set-up, which forms an “inverted H-bridge”. The design is used to build working prototype of PH system. Four control algorithms are proposed and investigated. The article addresses the scientific problem, which is defined as lack of information on how the algorithms change the energy flow during cycle, energy conversion efficiency and power. The mathematical model of PH system is developed, numerous computer simulation are performed and the results are compared to data acquired during on road tests made with working PH-system integrated with powertrain of ADLY ATV vehicle. The result shows that in dependency of control algorithm, there are different energy flows thru system which can be described as constant, interrupted or partially interrupted. It has important consequences on many essential parameters like efficiency power and torque generated by hydraulic motor.
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