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Vol. 160, Issue 12, December 2013, pp. 590-601

 

Bullet

 

The Position Control of the Hydraulic Cylinder Controlled by the High-Speed On-off Valve
 
Zhi-Hao LIU, Qin-He GAO, Hai-Long NIU

Xi'an Research Institution of High Technology, Xi'an, People's Republic of China
Tel.: +86-15102951659
E-mail: liuzhihaoainana@126.com

 

Received: 22 September 2013   /Accepted: 22 November 2013   /Published: 30 December 2013

Digital Sensors and Sensor Sysstems

 

Abstract: This paper aims to research the position control of the hydraulic cylinder controlled by the high-speed on-off valve to realize the precise position control. A compound algorithm of proportional integral & speed feedforward- displacement feedback is put forward based on the research on the relationship between the duty ratio and the past flow for the high speed on-off valve. The speed feedforward-displacement feedback algorithm can solve the hysteresis resulting from the feedback control and be considered as the certain duty ratio is given ahead, and the proportional integral control algorithm is designed and utilized to deal with the position error by adjusting to the duty ratio of high speed on-off valve. The genetic algorithm is used to tune the control parameters, including speed forward coefficient, proportional and integral coefficient of displacement feedback, output coefficient to gain the optimization result, on terms of the performance of the position control system. The mathematics modeling is analyzed and simulated with MATLAB/Simulink using the bulk-cavity-node method, and the hydraulic loop is established to verify the simulation result with the optimized results on the FESTO platform. The research finds that the proposed position scheme is effective to increase the position precision, and the position control parameters optimized by genetic algorithm can decrease the position error more.

 

Keywords: Position control, Speed feedforward-displacement feedback algorithm, High-speed on-off valve, Genetic algorithm; PI control.

 

 

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