PRINCIPLE TO CLOSED LOOP CONTROL DIFFERENTIAL CYLINDER WITH DOUBLE SPEED VARIABLE PUMPS AND SINGLE LOOP CONTROL SIGNAL  

作　　者：QuanLong NeubertT HelduserS 

机构地区：[1]InstituteofMechatronicsEngineering,TaiyuanUniversityofTechnology,Taiyuan030024,China [2]InstituteofFluidPowerandMotionControl,DresdenUniversityofTechnology,Dresden01062,Germany

出　　处：《Chinese Journal of Mechanical Engineering》2004年第1期85-88,共4页中国机械工程学报（英文版）

基　　金：This project is supported by National Natural Science Foundation of China(No.50275102) ;National Foundation for Abroad Return People, China (No.2001345).

摘　　要：To control the position of differential cylinder closed loop without usingany throttle elements, a flew idea that two speed variable pumps are used to compensate thenon-symmetric flow of differential cylinder is carried out. According to the leaking property of thesystem, a speed offset principle is also proposed to eliminate the cavitation and tension caused bythe leakage and condensation of oil, which makes the system be in the same state as a valvecontrolled circuit. This principle is explained theoretically and experimentally. Further therelationship that the pressures in cylinder chambers change with load and leakage, and therelationship between biasing speed and pre-load pressures in cylinder chambers are established. Theresearch has proved that the new system has similar technique features as those of controlled withservo valves, but due to the elimination of all the throttle lose the efficiency of system can beimproved greatly.To control the position of differential cylinder closed loop without usingany throttle elements, a flew idea that two speed variable pumps are used to compensate thenon-symmetric flow of differential cylinder is carried out. According to the leaking property of thesystem, a speed offset principle is also proposed to eliminate the cavitation and tension caused bythe leakage and condensation of oil, which makes the system be in the same state as a valvecontrolled circuit. This principle is explained theoretically and experimentally. Further therelationship that the pressures in cylinder chambers change with load and leakage, and therelationship between biasing speed and pre-load pressures in cylinder chambers are established. Theresearch has proved that the new system has similar technique features as those of controlled withservo valves, but due to the elimination of all the throttle lose the efficiency of system can beimproved greatly.

关 键 词：Electro-hydraulic servo control Speed variable pump Differential cylindersystem 

分 类 号：TP271.3[自动化与计算机技术—检测技术与自动化装置]