State Key Laboratory of Automotive Safety and Energy

Beijing, China

State Key Laboratory of Automotive Safety and Energy

Beijing, China

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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.


Li K.W.,State Key Laboratory of Automotive Safety and Energy | Li K.W.,Tsinghua University | Li K.W.,Chung Hua University | Meng F.,State Key Laboratory of Automotive Safety and Energy | And 3 more authors.
International Journal of Occupational Safety and Ergonomics | Year: 2014

Solid particles on the floor, both dry and wet, are common but their effects on the friction on the floor were seldom discussed in the literature. In this study, friction measurements were conducted to test the effects of particle size of solid contaminants on the friction coefficient on the floor under footwear, floor, and surface conditions. The results supported the hypothesis that particle size of solids affected the friction coefficient and the effects depended on footwear, floor, and surface conditions. On dry surfaces, solid particles resulted in friction loss when the Neolite footwear pad was used. On the other hand, solid particles provided additional friction when measured with the ethylene vinyl acetate (EVA) footwear pad. On wet surfaces, introducing solid particles made the floors more slip-resistant and such effects depended on particle size. This study provides information for better understanding of the mechanism of slipping when solid contaminants are present.


Bai A.,Tsinghua University | Wang L.,Tsinghua University | Wang L.,State Key Laboratory of New Ceramics and Fine Processing | Li J.,Tsinghua University | And 3 more authors.
Journal of Power Sources | Year: 2015

Graphite/Phosphorus composite anodes are prepared by mixing graphite and the phosphorus/carbon material, which prepared by heating the mixture of red phosphorus and porous carbon. Their electrochemical performances are evaluated as anodes for Li-ion batteries. A graphite/Phosphorus composite|LiFePO4 full-cell is also attempted. When the phosphorus/carbon content in the composite anode is 28.6 wt.%, the composite anode presents high reversible capacity of 500 mAh g-1 and considerable cycleability comparable to that of graphite anode, showing promising performance. © 2015 Elsevier B.V. All rights reserved.


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.


Tang L.,State Key Laboratory of Automotive Safety and Energy | Tang L.,Tsinghua University | Wang Y.,State Key Laboratory of Automotive Safety and Energy | Wang Y.,Tsinghua University | And 2 more authors.
International Journal of Crashworthiness | Year: 2010

The lower torso assembly of the Hybrid III (HIII) crash dummy adopts a one-piece vinyl skin/urethane foam design with a shape resembling the hip and thighs of a seated occupant. Although a ball-and-socket joint is used to connect the femur and the pelvis, the fixed-shape flesh design has essentially constrained the rotational freedom of the hip joint. A study of the effect of the constraint on the dummy response is presented. The result of this study could provide a direction for future improvement of the HIII dummy. A more human-body-like lower torso design is proposed and used to modify a non-linear finite-element HIII dummy model. The effect of the constraint is then evaluated using the modified model. © 2010 Taylor & Francis.


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.


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.


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.


Gao T.,State Key Laboratory of Automotive Safety and Energy | Lin C.,State Key Laboratory of Automotive Safety and Energy | Tian G.,State Key Laboratory of Automotive Safety and Energy
26th Electric Vehicle Symposium 2012 | Year: 2012

Various factors affect aging of lithium ion battery thus it's necessary to find out which factors have more influence and take this influence into the account of designing battery and BMS. This paper aims to solve the problem by conducting aging experiments and then establish a semi-empirical aging model to predict usable capacity based on known mechanism and experiment data for BMS. At the first stage, ambient temperature, charge and discharge C-rate and cut off voltage for charging are considered. The experiment is conducted based on 20 pouch LiMn2O4 cells from MGL with a rated capacity of 5 Ah.


Liangfei X.,State Key Laboratory of Automotive Safety and Energy | Fuyuan Y.,State Key Laboratory of Automotive Safety and Energy | Mingyin H.,State Key Laboratory of Automotive Safety and Energy | Jianqiu L.,State Key Laboratory of Automotive Safety and Energy | Minggao O.,State Key Laboratory of Automotive Safety and Energy
Chinese Control Conference, CCC | Year: 2012

This paper compares diverse energy management strategies for a 12m-length range extended electric city bus. The city bus is powered by li-ion batteries and an auxiliary power unit, which converts chemical energy into electric energy with an internal combustion engine and a generator. The power-train system is firstly modeled, and a global optimal problem targeting at minimizing the fuel consumption is described. The dynamic programming (DP) algorithm is utilized to solve the problem. The DP strategy is compared with CDCS (Charge Depleting and Charge Sustaining) and blended strategies. Simulation analysis and on-road testing are carried out. Results show that, for the specific configuration, the CDCS strategy is more suitable than blended strategy in real-time control applications. In the on-road testing of the Beijing 365 bus route, the equivalent fuel consumption with an empty load is 23.6L/100km, and it is 24.9L/100km with a fully load. Compared to a non-optimal blended strategy, the optimal CDCS strategy can reduce fuel consumption by 11%, and the DP strategy can reduce fuel consumption by 12.7%. According to on-road testing data, the fuel consumption can reduced by 17% compared to a traditional ICE powered city bus. © 2012 Chinese Assoc of Automati.

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