Abstract
| Original language | English |
|---|---|
| Journal | ISA Transactions |
| Volume | 19 |
| Issue number | 30 |
| Early online date | 2 Apr 2019 |
| DOIs | |
| Publication status | E-pub ahead of print - 2 Apr 2019 |
Keywords
- Deadzone compensation
- Deadzone detection
- Micro flow rate
- Pilot operated
- Position control
- Proportional directional valve
ASJC Scopus subject areas
- Instrumentation
- Computer Science Applications
- Electrical and Electronic Engineering
- Applied Mathematics
Cite this
Deadzone compensation control based on detection of micro flow rate in pilot stage of proportional directional valve. / Lu, Zhengyu; Zhang, Junhui; Xu, Bing; Wang, Di; Su, Qi; Qian, Jinyuan; Yang, Geng; Pan, Min.
In: ISA Transactions, Vol. 19, No. 30, 02.04.2019.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Deadzone compensation control based on detection of micro flow rate in pilot stage of proportional directional valve
AU - Lu, Zhengyu
AU - Zhang, Junhui
AU - Xu, Bing
AU - Wang, Di
AU - Su, Qi
AU - Qian, Jinyuan
AU - Yang, Geng
AU - Pan, Min
PY - 2019/4/2
Y1 - 2019/4/2
N2 - The pilot operated proportional directional valves (POPDVs) with a flow rate ranging from 100 to 1000 L/min are widely used in electro-hydraulic systems (EHSs). The deadzone of the pilot stage valve and its control compensation could significantly affect the position control performance for the main stage valve that could directly affect dynamics of EHSs In this paper, it is concluded that micro flow rates exist at the intermediate position of the valve based on the analysis of the continuity equation of the flow in the control chamber of the pilot stage. The micro flow rate is helpful to eliminate the discontinuity and unsmooth domain in the previous inverse deadzone compensation function. An improved deadzone detection method is proposed to calibrate the pilot valve flow characteristics which include the micro flow rate. This new method avoids the threshold selection of the main valve spool displacement which affects the detected deadzone values. Its detection processes are realized based on the pilot flow rate characterized by the speed of the main valve spool and the pilot valve displacement characterized by the solenoid current. The deadzone compensation control strategy based on the improved deadzone detection method is also designed. The experimental results using the steady-state position tracking and sinusoidal position tracking methods are verified. It is concluded that the tracking accuracy of the main valve spool position is effectively improved with this control strategy.
AB - The pilot operated proportional directional valves (POPDVs) with a flow rate ranging from 100 to 1000 L/min are widely used in electro-hydraulic systems (EHSs). The deadzone of the pilot stage valve and its control compensation could significantly affect the position control performance for the main stage valve that could directly affect dynamics of EHSs In this paper, it is concluded that micro flow rates exist at the intermediate position of the valve based on the analysis of the continuity equation of the flow in the control chamber of the pilot stage. The micro flow rate is helpful to eliminate the discontinuity and unsmooth domain in the previous inverse deadzone compensation function. An improved deadzone detection method is proposed to calibrate the pilot valve flow characteristics which include the micro flow rate. This new method avoids the threshold selection of the main valve spool displacement which affects the detected deadzone values. Its detection processes are realized based on the pilot flow rate characterized by the speed of the main valve spool and the pilot valve displacement characterized by the solenoid current. The deadzone compensation control strategy based on the improved deadzone detection method is also designed. The experimental results using the steady-state position tracking and sinusoidal position tracking methods are verified. It is concluded that the tracking accuracy of the main valve spool position is effectively improved with this control strategy.
KW - Deadzone compensation
KW - Deadzone detection
KW - Micro flow rate
KW - Pilot operated
KW - Position control
KW - Proportional directional valve
UR - http://www.scopus.com/inward/record.url?scp=85063904774&partnerID=8YFLogxK
U2 - 10.1016/j.isatra.2019.03.030
DO - 10.1016/j.isatra.2019.03.030
M3 - Article
VL - 19
JO - ISA Transactions
JF - ISA Transactions
SN - 0019-0578
IS - 30
ER -