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이용범(Y. B. Lee),고재명(J. M. Ko),김태석(T. S. Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The intelligent(automation and manless) hydraulic excavator can be realized when the position sensor is equipped within hydraulic cylinder. But, during the time, the installation of position sensor was impossible because cylinder used the cushion at both ends and the broken problem of sensor is arisen under working when it is installed outside of hydraulic cylinder. In order to these problems, we developed high-reliable hydraulic cylinder using a new position detecting technology. As it were, firstly, seat type permanent magnets are installed on the partial load surface of hydraulic cylinder and outer wall is made by use of non magnetic stainless tube, and then the hall sensor detects the rod position of hydraulic cylinder. This technology improved the weak magnetic slope problem arisen when position control is performed, and also solved the electromagnetic noise problem according to increasing of amplification rate of magnetic sensor.
이용범(Y. B. Lee) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.4
With recent oil price increases, the fuel efficiency of hydraulic excavators has become a serious issue. Researchers have considered weight lightening by high pressurization in order to improve the efficiency of the excavator and pump controlled actuation (PCA) and to reduce pressure loss of hybrid and valves using mechanical inertia. However, high pressurization is not very effective because the excavator operates at a low speed; a hybrid is inefficient because little accumulated inertial energy is accumulated; and PCA is ineffective because control precision and responsibility are low. In this study, a method to minimize air and gas in hydraulic oil has been presented as a simple and new way to increase hydraulic efficiency.