|
Xu Bing
Ma Jien
Lin Jianjie
State Key Laboratory of Fluid Power
Transmission and Control,
Zhejiang University,
Hangzhou 310027, China |
|
|
COMPUTATIONAL
FLOW RATE
FEEDBACK AND
CONTROL METHOD
IN HYDRAULIC ELEVATORS*
Abstract:
The computational flow rate feedback and control method, which can be used in proportional valve controlled hydraulic elevators, is discussed and analyzed. In a hydraulic elevator with this method, microprocessor receives pressure information from the pressure transducers and computes the flow rate through the proportional valve based on pressure-flow conversion real time algorithm. This hydraulic elevator is of lower cost and energy consumption than the conventional closed loop control hydraulic elevator whose flow rate is measured by a flow meter. Experiments are carried out on a test rig which could simulate the load of hydraulic elevator. According to the experiment results, the means to modify the pressure-flow conversion algorithm are pointed out.
Key words:
Hydraulic elevator Computational flow rate Proportional valve |