Title: Robust control and modelling of a heavy equipment variable displacement pump hydraulic system

Authors: Salem A. Haggag

Addresses: Faculty of Engineering, Department of Automotive Engineering, Ain Shams University, 1 El-Sarayat St., Abbassia, Cairo, Postal Code 11517, Egypt

Abstract: Pump, valve and actuator hydraulic system is a common hydraulic system that is widely used in many heavy types of equipment. In this paper, a new robust control strategy for a variable displacement pump hydraulic system is presented. The proposed control strategy effectively compensates for different system uncertainties and un-modelled dynamics, such as leakage resulting from wear, aging and temperature change. This ensures a continuous and consistent system performance under different operating conditions. The presented control strategy relies on a novel concept that uses the system standby pressure as an estimator for system leakage during normal operating conditions. A complete non-linear model for a generic hydraulic system is presented. Simulation results are provided to validate the effectiveness of the proposed control approach.

Keywords: robust control; variable displacement pumps; swashplate; heavy equipment; earth moving equipment; axial piston pumps; velocity control; leakage compensation; hydraulic actuators; velocity modulation; system uncertainties; nonlinear modelling; simulation.

DOI: 10.1504/IJHVS.2011.041595

International Journal of Heavy Vehicle Systems, 2011 Vol.18 No.3, pp.288 - 302

Published online: 27 Jul 2011 *

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