Valve Displacement Feedback Control Hydraulic Elevator

Takashi Matsudo, Toshisuke Mine, Makoto Tachibana and Haruo Watanabe

Tuesday 1st October 1996

In the hydraulic elevator, the cylinder capacity becomes large and the rope be long in proportion to the elevator stroke. We developed the valve displacement control system that feedbacks the valve displacement to the microcomputer. This system prevents the occurrence of the low frequency vertical vibration, so the elevator can run smoothly even if the hydraulic oil temperature of the pressure change.

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