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| 1 | Identification of Maximum Road Friction Coefficient and Optimal Slip Ratio Based on Road Type Recognition显示文摘The identification of maximum road friction coefficient and optimal slip ratio is crucial to vehicle dynamics and control.However,it is always not easy to identify the maximum road friction coefficient with high robustness and good adaptability to various vehicle operating conditions.The existing investigations on robust identification of maximum road friction coefficient are unsatisfactory.In this paper,an identification approach based on road type recognition is proposed for the robust identification of maximum road friction coefficient and optimal slip ratio.The instantaneous road friction coefficient is estimated through the recursive least square with a forgetting factor method based on the single wheel model,and the estimated road friction coefficient and slip ratio are grouped in a set of samples in a small time interval before the current time,which are updated with time progressing.The current road type is recognized by comparing the samples of the estimated road friction coefficient with the standard road friction coefficient of each typical road,and the minimum statistical error is used as the recognition principle to improve identification robustness.Once the road type is recognized,the maximum road friction coefficient and optimal slip ratio are determined.The numerical simulation tests are conducted on two typical road friction conditions(single-friction and joint-friction)by using CarSim software.The test results show that there is little identification error between the identified maximum road friction coefficient and the pre-set value in CarSim.The proposed identification method has good robustness performance to external disturbances and good adaptability to various vehicle operating conditions and road variations,and the identification results can be used for the adjustment of vehicle active safety control strategies. | GUAN Hsin WANG Bo LU Pingping XU Liang | 2014 | Chinese Journal of Mechanical Engineering2014，27，5： | 8 |
| 2 | Active steering control strategy for articulated vehicles显示文摘To improve maneuverability and stability of articulated vehicles, we design an active steering controller, including tractor and trailer controllers, based on linear quadratic regulator(LQR) theory. First, a three-degree-of-freedom(3-DOF) model of the tractor-trailer with steered trailer axles is built. The simulated annealing particle swarm optimization(SAPSO) algorithm is applied to identify the key parameters of the model under specified vehicle speed and steering wheel angle. Thus, the key parameters of the simplified model can be obtained according to the vehicle conditions using an online look-up table and interpolation. Simulation results show that vehicle parameter outputs of the simplified model and Truck Sim agree well, thus providing the ideal reference yaw rate for the controller. Then the active steering controller of the tractor and trailer based on LQR is designed to follow the desired yaw rate and minimize their side-slip angle of the center of gravity(CG) at the same time. Finally, simulation tests at both low speed and high speed are conducted based on the Truck Sim-Simulink program. The results show significant effects on the active steering controller on improving maneuverability at low speed and lateral stability at high speed for the articulated vehicle. The control strategy is applicable for steering not only along gentle curves but also along sharp curves. | Kyong-il KIM Hsin GUAN Bo WANG Rui GUO Fan LIANG | 2016 | Frontiers of Information Technology & Electronic Engineering2016，17，6： | 5 |
| 3 | Novel Evaluation Method of Vehicle Suspension Performance Based on Concept of Wheel Turn Center显示文摘The current research of suspension performance evaluation is mixed in the evaluation of vehicle handling and ride comfort. However, it is lack of a direct and independent evaluation method for suspension performance. In this paper, a novel wheel turn center method is proposed to evaluate the suspension performance. This method is based on the concept and application of wheel turn center(WTC) and sprung mass turn center(SPTC). The vehicle body and each wheel are regarded to be independent rigid bodies and have their own turn centers which reflect respective steering motions and responses. Since the suspension is the link between vehicle body and wheels, the consistence between the sprung mass turn center and the wheel turn center reflects the effect and performance of the suspension system. Firstly, the concept and appropriate calculation method of WTC and SPTC are developed. Then the degree of inconsistence between WTC and SPTC and the time that they achieve consistence, when the vehicle experiences from transient steering to steady steering state, are proposed to evaluate suspension performance. The suspension evaluation tests are conducted under different vehicle velocities and lateral accelerations by using Car Sim software. The simulation results show that the inconsistence of steering motion between vehicle body and wheels are mainly at high speeds and low lateral accelerations. Finally, based on the proposed evaluation indexes, the influences of different suspension characteristic parameters on suspension performance and their matches to improve steering coordination are discussed. The proposed wheel turn center method provides a guidance and potential application for suspension evaluation and optimization. | WANG Bo GUAN Hsin LU Pingping ZHAN Jun | 2015 | Chinese Journal of Mechanical Engineering2015，28，5： | 2 |
| 4 | A vacuum booster model for brake pedal feeling analysis显示文摘 | GUAN Hsin HAO Weituo ZHAN Jun | 2012 | Advanced Materials Research2012，，： | 1 |
| 5 | Modeling of Driver/Vehicle Directional Control System显示文摘 | Guo Konghui Guan Hsin | 1993 | Vehicle System Dynamics1993，22，1： | 1 |
| 6 | Modelling of Driver/Vehicle Directional Control System 显示文摘 | Guo Konghui Guan Hsin | 1993 | Vehicle System Dynamics1993，22，3： | 1 |
| 7 | Modelling of Driver/vehicle Directional Control System 显示文摘 | Guo Konghui Guan Hsin | 1993 | Vehicle System Dynamics1993，22，3： | 1 |
| 8 | Modelling of driv-er/ve- hicle directional control system显示文摘 | Guo Kong-hui Guan Hsin | 1993 | Vehicle System Dynamics1993，22，1： | 1 |
| 9 | A Driver Direction Control Model and Its Application in the Simulation of Driver-Vehicle-Road Closed-Loop System显示文摘 | Guan Hsin Gao Zhenhai Guo Konghui | 2000 | SAE Paper2000，，： | 1 |
| 10 | Modelling of driver/vehicle directional control system显示文摘 | Guo Konghui Guan Hsin | 1993 | Vehicle System Dynamics1993，22，1： | 1 |
| 11 | Modeling of driver/vehicle directional control system显示文摘 | GUO Konghui GUAN Hsin | 1993 | Vehicle System Dynamics1993，22，1： | 1 |
| 12 | Research of Driver Optimal Preview Acceleration Integrated Decision Model显示文摘 | Guan Hsin Zhang Licun Gao Zhenhai | 2006 | Journal of Jilin University: Engineering and Technology Edition2006，6，1： | 1 |
| 13 | Modeling of driver/vehicle directional control system显示文摘 | GUO Konghui GUAN Hsin | 1993 | Vehicle System Dynamics1993，22，1： | 1 |
| 14 | Modelling of driver/vehicle directional control system显示文摘 | Guo Konghui Guan Hsin | 1993 | Vehicle System Dynam- ics1993，22，34： | 1 |
| 15 | Modelling of driver/vehicle directional controlsystem显示文摘 | GUAN Hsin | 1993 | Vehicle System ynamics1993，22，1： | 1 |
| 16 | Multiple unpinned Dirac points in group-Va single-layers with phosphorene structure显示文摘Emergent Dirac fermion states underlie many intriguing properties of graphene,and the search for them constitutes one strong motivation to explore two-dimensional(2D)allotropes of other elements.Phosphorene,the ultrathin layers of black phosphorous,has been a subject of intense investigations recently,and it was found that other group-Va elements could also form 2D layers with similar puckered lattice structure.Here,by a close examination of their electronic band structure evolution,we discover two types of Dirac fermion states emerging in the low-energy spectrum.One pair of(type-I)Dirac points is sitting on high-symmetry lines,while two pairs of(type-II)Dirac points are located at generic k-points,with different anisotropic dispersions determined by the reduced symmetries at their locations.Such fully-unpinned(type-II)2D Dirac points are discovered for the first time.In the absence of spin-orbit coupling(SOC),we find that each Dirac node is protected by the sublattice symmetry from gap opening,which is in turn ensured by any one of three point group symmetries.The SOC generally gaps the Dirac nodes,and for the type-I case,this drives the system into a quantum spin Hall insulator phase.We suggest possible ways to realise the unpinned Dirac points in strained phosphorene. | Yunhao Lu Di Zhou Guoqing Chang Shan Guan Weiguang Chen Yinzhu Jiang Jianzhong Jiang Xue-sen Wang Shengyuan A Yang Yuan Ping Feng Yoshiyuki Kawazoe Hsin Lin | 2016 | npj Computational Materials2016，，1： | 0 |
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