Abstract
ABSTRACTLeakage compensation in constant load speed hydraulic systems is highly requiredto have a precise control of the job target. To achieve this two options are available,either pump control or flow control. In the present work, experimental investigationof a constant load speed system test rig equipped with proportional electro-hydraulicvalve and variable pump is studied. The leakage compensation has been achievedby controlling the proportional electro-hydraulic valve input volt or controlling thepump speed through frequency modulator. The study aims to highlight the differencebetween these two control options on the dynamic and steady state response of thesystem. The supply and return cylinder pressures, cylinder displacement and flowrate are recorded. Different external leakages have been intentionally introduced inthe connections to the flow control valve to simulate the external system leakage.Results showed that the dynamic and steady state system performance have beenaffected by the system leakage. The volt control signal for proportional DCV andfrequency control for pump control could be used for leakage compensation throughcontroller with a precise control algorithm to compensate leakage in electrohydraulicproportional systems.
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