An Elevator Hydraulic System Using Cabin Speed Feedback

The effects of load variation, oil temperature variation, and friction on the performance of proportional valves using flowrate feedback affect the operating stability and riding comfort of hydraulic elevators. In this paper, an elevator hydraulic system using a new proportional valve is introduced. In the new system developed, the new proportional valve is controlled in accordance with the speed feedback from the elevator cabin. The new system, therefore, is more robust so that it can offer more stable operation and more comfortable ride.