A Compensator-less Load Sensing System Designed for Electrified Compact Track Loader
DOI:
https://doi.org/10.13052/ijfp1439-9776.2624Keywords:
Electrification, load-sensing system, compensator-less valve, efficiencyAbstract
This study introduces an innovative design for the hydraulic implement system in electrified compact track loader applications. The presented architecture is based on a pre-compensated load sensing system, incorporating electronified components and removing one compensator for the boom function. The system employs an electronified open-center pump (eOC-P) and a load sensing pre-compensated valve sourced from Rexroth. The compensator for the boom function is re-designed to remain static, allowing a bidirectional path for regeneration during the boom lowering phase. The eOC-P offers pressure control, flow control, displacement control, and torque control modes, achieved by replacing the traditional mechanical load sensing feedback with sensor signals. A dedicated control strategy is proposed and verified for the compensator-less design to adapt its operational modes to suit both single and multiple user conditions. According to the simulation, the proposed system can achieve the same controllability compared to conventional LS system with energy regeneration capability. From the tests on the proving ground, the novel system performs the same functionality and reduces the power consumption of 37% compared to the baseline open-center system on a 68kW rated power 5-ton compact loader.
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