NAME
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Brandon Hencey |
PROJECT
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1A1: Improving Efficiency of Engine Driven Electrohydraulic Powertrains |
ABSTRACT
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The evolution of the fluid power system from mechanically to electronically controlled systems creates an opportunity for improvements in efficiency through the use of intelligent control algorithms. Consequently, it is of interest to develop a supervisory control strategy that seeks to maximize the fluid power system efficiency. Here we examine the coupled optimization of power generation and power distribution for a mobile type of electrohydraulic application. An internal combustion engine converts chemical energy to mechanical power. The mechanical power is converted to fluid power by means of a variable displacement pump. The fluid power is then distributed via a coupled network of supply lines to dynamic loads. In our investigation, it was determined the overall efficiency is largely dependent upon the internal combustion engine's operating conditions. As a result, one strategy involves optimizing the engine operation through the extra degree of freedom introduced by the variable displacement pump. This presentation proposes a novel technique to dynamically estimate the minimal engine power while meeting steady-state load demands. The framework presents a first step towards power management for mobile electrohydraulic systems. We also briefly discuss where regenerative capability would be inserted into the framework. |