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- 저자 : Lian Yufeng (검색결과 4 건)
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Yufeng Lian,Xiaoyu Wang,Yantao Tian,Keping Liu 한국자동차공학회 2018 International journal of automotive technology Vol.19 No.2
This paper presents a new control scheme for lateral collision avoidance (CA) systems to improve the safety of four-in-wheel-motor-driven electric vehicles (FIWMD-EVs). There are two major contributions in the design of lateral CA systems. The first contribution is a new lane-changing model based on vehicle edge turning trajectory (VETT) to make vehicle adapt to different driving roads and conform to drivers’ characteristic, in addition to ensure vehicle steering safety. The second contribution is vehicle semi-uncertainty dynamic model (SUDM), which is SISO model. The problem of stability performance without the information on sideslip angle is solved by the proposed SUDM. Based on the proposed VETT and SUDM, the lateral CA system can be designed with robust controller to restrain the effect of uncertainties resulting from parameter perturbation and lateral wind disturbance. Single and mixed driving cycles simulation experiments are carried out with CarSim to demonstrate the effectiveness in control scheme, simplicity in structure for lateral CA system based on the proposed VETT and SUDM.
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Lian Yufeng,Liu Shuaishi,Zhongbo Sun,Liu Keping,Nie Zhigen,Tian Chongwen 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.4
This paper presents an active collision avoidance system based on a braking force distribution strategy for four-in-wheel-motor-driven electric vehicles (FIWMD-EVs) on roads with different friction coefficients. There are three major contributions in the proposed braking force distribution strategy. Firstly, the braking force distribution strategy based on constrained regenerative braking strength continuity (CRBSC) is further improved, and its general analytic expressions are derived. It provides the theoretical basis of braking force distribution between front and rear wheels. Secondly, the braking forces between front and rear wheels can be redistributed by considering power demand efficiency (PDE) to protect energy storage system from overcharge. Finally, the braking forces between left and right wheels can be distributed with different adhesion coefficients to adapt to complex roads. Simulations using rapid control prototyping (RCP) and hardware-in-the-loop (HIL) simulator are performed to demonstrate the effectiveness of control scheme and adaptability of the active collision avoidance system based on the proposed braking force distribution strategy on complex roads.
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Yong Yan,Shasha Li,Yufeng Ou,Yaxin Ji,Zhou Yu,Lian Liu,Chuanpeng Yan,Yong Zhang,Yong Zhao 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.6
Crystalline In2Se3 films were fabricated by magnetron sputtering from a sintered In2Se3-compound target and the effects of the deposition parameters, including the working pressure and deposition time, on the phase composition, structure, morphology, and optical properties were clarified. Single-phase κ-In2Se3 was prepared at 4.0 Pa, but γ-In2Se3 was recognized when the working pressure was lower than 4.0 Pa. The optical transmittance of the films decreased to 45% and the optical band gap varied from 2.9 to 2.0 eV with increasing film thickness from 80 to 967 nm. Metal-semiconductor-metal (MSM) photodetectors based on γ-In2Se3 thin films with various thicknesses were also fabricated. The result of photosensitivity research on such MSM photodetectors suggests that it may be impossible to fabricate wide-absorption-range MSM devices by just using a single material (γ-In2Se3) because of spatial potential fluctuations in the layers.
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Zhigen Nie,Zhongliang Li,Wanqiong Wang,Yufeng Lian,Rachid Outbib 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.1
Dynamic trajectory planning (DTP) and Dynamic trajectory tracking (DTT) are the real-time mutual coupling in the process of the dynamic lateral obstacle avoidance (DLOA) of connected and automated vehicles (CAVs). Meanwhile, the varying velocity and acceleration of obstacle vehicles (OVs) increase the difficulties of DTP. Furthermore, the parameters perturbation in CAVs (such as mass and cornering stiffness), the varying velocities of CAVs and the signal disturbances, raise the difficulties of DTT. Therefore, the DLOA is challenging due to the interaction of the above multiple factors. To address the problem, this paper proposes a robust gain-scheduling control strategy of DLOA for CAVs. The strategy is divided into two modules namely DTP and DTT, and the two modules cooperate with each other in real time. In the module of DTP, the optimal trajectory considering the efficiency, passenger comfort and safety is real-time optimized in the dynamic safe limit which is real time predicted according to the information from CAVs and OVs. In the module of DTT, the real-time trajectory reference is tracked. Robust gain-scheduling control is realized to cope with variation of real-time trajectory reference, varying velocity, parameters perturbation and signal disturbances during the process of DLOA. The simulation results indicate that the strategy can effectively achieve DLOA maintaining the vehicle stability across various working conditions.
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