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Title: Electro-hydraulic proportional control of twin-cylinder hydraulic elevators
Authors: Li, K.
Mannan, M.A. 
Xu, M.
Xiao, Z.
Keywords: Hydraulic elevator
Hydraulic lock
Velocity tracking
Issue Date: Apr-2001
Source: Li, K.,Mannan, M.A.,Xu, M.,Xiao, Z. (2001-04). Electro-hydraulic proportional control of twin-cylinder hydraulic elevators. Control Engineering Practice 9 (4) : 367-373. ScholarBank@NUS Repository.
Abstract: The large size of the cab of an electro-hydraulic elevator necessitates the arrangement of two cylinders located symmetrically on both sides of the cab. This paper reports the design of an electro-hydraulic system which consists of three flow-control proportional valves. Speed regulation of the cab and synchronization control of the two cylinders arc also presented. A pseudo-derivative feedback (PDF) controller is applied to obtain a velocity pattern of the cab that proves to be close to the given one. The non-synchronous error of the two cylinders is kept within ± 2 mm with a constrained step proportional-derivative (PD) controller. A solenoid-actuated non-return valve, i.e. a hydraulic lock, is also developed to prevent cab sinking and allow easy inverse-fluid flow. © 2001 Published by Elsevier Science Ltd.
Source Title: Control Engineering Practice
ISSN: 09670661
DOI: 10.1016/S0967-0661(01)00003-X
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