Application of Electrohydraulic Proportional Valve for Steering Improvement of an Autonomous Tractor

Lee, Changjoo; Jeon, Chan-Woo; Han, Xiongzhe; Kim, Jung Hun; Kim, Hak-Jin

doi:10.1007/s42853-022-00137-x

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…Referring to the study by Subramanian (2006) and the obstacles detection by Thanpattranon et al (2015Thanpattranon et al ( , 2016, the sugarcane row detection and driver assistance system in the current study provided comparable results. In-field path planner for autonomous tractor 14.9-21.8 cm at tractor speed of 3 km/hr Yun et al (2021) Ridge-furrow detection and tracking using a stereovision camera 2.78-8.67 cm at tractor speed of 0.9 km/hr Lee et al (2022) Electrohydraulic steering system for autonomous tractor 12 cm at tractor speeds of 2 and 5 km/hr Ma et al (2022) Satellite and visual integrated navigation for a crawler tractor 5.5 cm at the tractor speed of 3.6-4.3 km/hr…”

Section: Sugarcane Row Detection Resultsmentioning

confidence: 99%

Development of a low-cost driver assistance system for tractors in sugarcane fields using a scanning-laser range finder

2022

ANRES

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Article InfoImportance of the work: For off-road vehicles, different guidance or positioning systems present different sets of challenges. Scanning-laser rangefinders (SLRs) possess many advantages over other systems, for example the ability to operate in different light conditions, providing high resolution positioning data, robustness against vapor and dust interferences, not requiring many accessories or peripherals and lower equipment costs. Objectives: To develop and test a low-cost driver assistance system for a tractor. Materials & Methods: The driver assistance system primarily consisted of a sensor, a guidance algorithm and a graphic user interface display. In principles, the algorithm identified obstacle objects from the laser beams reflected back to the SLR and then recommended steering directions to the driver via the display. In the preliminary trial and first test, the tractor was driven parallel to a straight reference furrow located on the right side of the tractor, simulating a ploughing operation. In the second test, the tractor travelled along a straight path between rows of sugarcanes, simulating a harvest operation. Results: In the furrow detection test, the system yielded maximum and root-mean-square errors in the ranges 15.80-41.40 cm and 4.55-20.86 cm, respectively. The tracking errors of the sugarcane row detection test were in a satisfying range similar to those found in the furrow slice detection results. Main finding: With further refinement, the driver assistance system could potentially be used in practice.

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Section: Sugarcane Row Detection Resultsmentioning

confidence: 99%

Development of a low-cost driver assistance system for tractors in sugarcane fields using a scanning-laser range finder

2022

ANRES

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“…The performance of the steering system is important for precise steering of the tractor. Most tractors utilize hydraulic power steering systems, as they are more reliable than electric motor power steering (EPS), especially in agricultural machinery that is often exposed to large and fluctuating loads [8]. In such a hydraulic system, steering performance may be reduced due to factors such as fluid non-linearity and tractor vibrations.…”

Section: Introductionmentioning

confidence: 99%

“…When EHPV is tested on an actual tractor or a test device capable of realizing actual working conditions, changes in dynamic characteristics according to the working conditions of the tractor can be analyzed. Lee et al (2022) developed a steering algorithm through the hardware-in-the-loop (HIL) test to identify the dynamic characteristics of a tractor hydraulic system [8]. The results of the study demonstrated that the development of a steering algorithm can effectively improve the nonlinearity of EHPV.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Hydraulic Characteristics of Electrohydraulic Proportional Valve (EHPV) for an Auto-Steering Tractor Application

Min

Kim

Lim³

et al. 2023

Machines

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The performance of the electrohydraulic proportional control valve (EHPV) employed in a tractor’s automatic steering system directly influences the steering performance. To develop a highly reliable EHPV, it is essential to analyze the hydraulic characteristics of the EHPV for several working conditions of tractors. This study aimed to measure and analyze the hydraulic characteristics of the EHPV according to tractor working conditions. The flow rate and pressure data of the EHPV were computed through the valve measuring system, and the required power was computed. The experimental conditions were selected based on engine rotational speed and tractor steering angle. As a result, it was discovered that the flow rate, pressure, and power all increased when the engine rotation speed and steering angle conditions increased. Furthermore, the rates of increase in flow rate, pressure, and power based on the increase in the steering angle were higher than when the engine rotation speed increased. In the regression analysis results between the two variables and the hydraulic characteristics of EHPVs, the steering angle demonstrated a higher correlation than the engine rotation speed. In conclusion, the steering angle and engine rotational speed are the major variables in the hydraulic characteristics of EHPVs, and the influence of the steering angle is greater.

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Research on the Steering Characteristics of Electro-Hydraulic Coupled Steering System of Self-Driving Tractor

XU,

SUN,

CHEN

et al. 2024

INMATEH

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To solve the problem of poor steering performance of existing self-driving tractors based on electro-hydraulic coupled steering systems (E-HCSS) under multiple influencing factors, the research on electro-hydraulic coupled steering characteristics of self-driving tractors was carried out in this paper. Taking the electro-hydraulic coupled steering system as the research object, the E-HCSS test bench of the tractor was built, and the influencing factors affecting the responsiveness of the steering process were obtained through theoretical analysis: hydraulic fluid temperature, oil supply pressure and driving speed. The hydraulic fluid temperature, oil supply pressure and driving speed were taken as the test factors, and the steering system response time and response error were taken as the performance indexes for the single-factor steering test and orthogonal test. By establishing the regression mathematical model between the influencing factors and the indexes, the interactive influence of the factors on the indexes was analyzed, the optimal parameter combination was obtained, and the optimization results were verified. The test results indicated that the tractor electro-hydraulic coupling steering system could achieve good steering performance under the optimal parameter combination, and the optimal parameter combination was: hydraulic oil temperature 60°C, hydraulic oil pressure 15 MPa and driving speed 8 km/h. The study's results were as follows: hydraulic oil temperature 60°C, hydraulic oil pressure 15 MPa and driving speed 8 km/h. The study's results could provide a reference for the steering control of the self-driving tractor, the design of the self-driving steering system and the optimization of the parameters.

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Application of Electrohydraulic Proportional Valve for Steering Improvement of an Autonomous Tractor

Cited by 3 publications

References 8 publications

Development of a low-cost driver assistance system for tractors in sugarcane fields using a scanning-laser range finder

Development of a low-cost driver assistance system for tractors in sugarcane fields using a scanning-laser range finder

Evaluation of Hydraulic Characteristics of Electrohydraulic Proportional Valve (EHPV) for an Auto-Steering Tractor Application

Research on the Steering Characteristics of Electro-Hydraulic Coupled Steering System of Self-Driving Tractor

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