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CLC number: TP273; TH137.52

On-line Access: 2016-05-04

Received: 2015-05-30

Revision Accepted: 2015-09-08

Crosschecked: 2016-04-13

Cited: 0

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Citations:  Bibtex RefMan EndNote GB/T7714


Jin-yi Liu


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Frontiers of Information Technology & Electronic Engineering  2016 Vol.17 No.5 P.458-464


Proportional directional valve based automatic steering system for tractors

Author(s):  Jin-yi Liu, Jing-quan Tan, En-rong Mao, Zheng-he Song, Zhong-xiang Zhu

Affiliation(s):  Beijing Key Laboratory of Optimized Design for Modern Agricultural Equipment, China Agricultural University, Beijing 100083, China

Corresponding email(s):   zhuzhonxiang@cau.edu.cn

Key Words:  Automatic steering system, Hydraulic circuit, Proportional directional valve, Proportional-integral-derivative (PID) control

Jin-yi Liu, Jing-quan Tan, En-rong Mao, Zheng-he Song, Zhong-xiang Zhu. Proportional directional valve based automatic steering system for tractors[J]. Frontiers of Information Technology & Electronic Engineering, 2016, 17(5): 458-464.

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A1 - Jin-yi Liu
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A1 - Zhong-xiang Zhu
J0 - Frontiers of Information Technology & Electronic Engineering
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DOI - 10.1631/FITEE.1500172

Most automatic steering systems for large tractors are designed with hydraulic systems that run on either constant flow or constant pressure. Such designs are limited in adaptability and applicability. Moreover, their control valves can unload in the neutral position and eventually lead to serious hydraulic leakage over long operation periods. In response to the problems noted above, a multifunctional automatic hydraulic steering circuit is presented. The system design is composed of a 5-way-3-position proportional directional valve, two pilot-controlled check valves, a pressure-compensated directional valve, a pressure-compensated flow regulator valve, a load shuttle valve, and a check valve, among other components. It is adaptable to most open-center systems with constant flow supply and closed-center systems with load feedback. The design maintains the lowest pressure under load feedback and stays at the neutral position during unloading, thus meeting the requirements for steering. The steering controller is based on proportional-integral-derivative (PID) running on a 51-microcontroller-unit master control chip. An experimental platform is developed to establish the basic characteristics of the system subject to stepwise inputs and sinusoidal tracking. Test results show that the system design demonstrates excellent control accuracy, fast response, and negligible leak during long operation periods.

Excellent and valuable work.




Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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