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Zhang W.,University of Science and Technology Beijing | Zhang W.,State Key Laboratory of Automotive Safety and Energy
International Journal of Control | Year: 2010

This article presents a unified understanding and judgement of the stability and convergence of a general self-tuning control (STC) system, which consists of arbitrary control strategy, arbitrary parameter estimation algorithm and a deterministic/stochastic linear time-invariant (LTI) plant. The necessary conditions required for the global stability and convergence of a general STC system are relaxed, i.e. the convergence of parameter estimates is removed for both deterministic and stochastic STC schemes. To reach this goal, 'virtual equivalent system (VES)' concept and methodology is adopted. With the help of VES, the original nonlinear dominant (nonlinear in structure) problem is converted to a linear dominant (linear in structure) problem. The results developed in this article show that STC systems are stable and convergent for the abundance of control strategies and parameter estimation algorithms, which will provide great flexibility in the applications of STC. © 2010 Taylor & Francis. Source


Lu G.,State Key Laboratory of Automotive Safety and Energy
Proceedings - 2013 5th Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2013 | Year: 2013

Based on the theory and research methods of binocular vision, mechanical structure design and human-machine engineering, the portable investigation system in traffic accident scenes is designed and established. This system is composed of two ordinary fixed focus cameras, control and display unit, connection platform and other accessories, which is convenient(scale-free), accurate and portable for quick investigation of traffic accident scenes. © 2013 IEEE. Source


Wang L.,Tsinghua University | He X.,Tsinghua University | He X.,State Key Laboratory of Automotive Safety and Energy | Li J.,Tsinghua University | And 5 more authors.
Angewandte Chemie - International Edition | Year: 2012

More than LiP service: The adsorption of red phosphorus into porous carbon provides a composite anode material for lithium-ion batteries. The amorphous nano phosphorus, in the carbon matrix, shows highly reversible lithium storage with high coulombic efficiencies and stable cycling capacity of 750 mAh per gram composite (see picture). Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Zhang W.,University of Science and Technology Beijing | Zhang W.,State Key Laboratory of Automotive Safety and Energy | Fan Q.,University of Science and Technology Beijing
ICCAS 2010 - International Conference on Control, Automation and Systems | Year: 2010

An abnormal driving state recognition method is proposed in this paper. The basic idea is to regard the driving behavior as a feed back control system; the input signal is vehicle lateral position; the output signal is steering wheel angle. The control system, i.e., the driving behavior, is modeled with normal driving data. And then the model is used to fit the driving data of unknown driving state. The fitting error was evaluated and monitored with statistical process control (SPC) approach, i.e., the control charts tools. If the fitting error is evidently different from that of normal driving state, then abnormal driving state is recognized. Experiment results verified the effectiveness of the proposed method. ©ICROS. Source


Zhang W.,University of Science and Technology Beijing | Zhang W.,State Key Laboratory of Automotive Safety and Energy | Li Y.,University of Science and Technology Beijing
ICCAS 2010 - International Conference on Control, Automation and Systems | Year: 2010

In recent years, virtual equivalent system (VES) theory for self-tuning control has been established. Based on VES concept and methodology, we have a unified understanding and judgment of the stability and convergence of a general self-tuning control (STC) system. The necessary conditions for global stability and convergence are relaxed, i.e., the convergence of parameter estimates is removed. This paper presents a simulation verification of the input-output equivalence between the original STC and its VES. The simulation results support the VES theory. ©ICROS. Source

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