A segmental pump-motor control scheme to attain targeted speed under varying load demand of a hydraulic drive used in heavy earth movers

Abstract The work presents a segmented pump-motor control scheme of a closed-loop hydraulic drive used in mining equipment. It analyses the dynamics of the drive through modeling and simulation. The system model integrates a control scheme for modulating the displacement of the pump and the hydro-motor of the hydraulic drive. The model also considers the state-dependent non-linear losses as well as the transient behaviors of the pump and the hydro-motor. The experimental results validate the model for various working conditions of the equipment. The model simulation also analyses the perturbation of critical parameters and control gain on the system's performance for a wide range of operating conditions of the mining equipment. The study performed in this research work will be expedient for the preliminary design and assortment of similar hydraulic drive used in the mobile equipment.