Song Q.,Shaanxi Automobile Group Co. |
Song Q.,Changan University
Information Technology Journal | Year: 2012
Echo State Neural Network (ESN) has becoming much attractive in Artificial Neural Network (ANN) community since it can be easily constructed and adapted. Its superiority over traditional ANN has been demonstrated in many applications. The Wiener-Hopf solution is usually exploited to account for the adaptations. However, the solution can hardly ensure the Lyapunov stability of the trained Leaky-integrator ESNs (LiESNs), when they run in a closed-loop autonomously generative mode. LiESN is another type of ESN, which consists of leaky-integrator neurons. In this study, a sufficient condition of the Lyapunov stability for the autonomously running LiESNs is proposed and proved at first. And then, the output connection weight learning problem is translated into an optimization problem with a nonlinear restriction. Particle swarm optimization algorithm is explored to solve the optimization problem. The simulation experiment results show that the output weight adaptation algorithm, we proposed (we call it PSOESN) can effectively ensure the output precision as well as the Lyapunov stability of the trained LiESNs. It is concluded that the PSOESN is a more effective solution to the output connection weight adaptation problem of such autonomously running ESNs. © 2012 Asian Network for Scientific Information.
Fang H.-W.,Changan University |
Fang H.-W.,Shaanxi Automobile Group Co. |
Ma J.,Changan University
Jiaotong Yunshu Gongcheng Xuebao/Journal of Traffic and Transportation Engineering | Year: 2013
Aiming at the transformation problem of manufacturing industry from production manufacturing to service-oriented manufacturing under the background of service economy, the relation between value-added service and service-oriented manufacturing industry was researched. The types of value-added services for service-oriented automobile manufacturing industry were analyzed, the development models of value-added services and business mode based on value-added service for automobile manufacturing industry were proposed, and the business mode of service-oriented manufacturing for Shaanxi Automobile Group Co., Ltd. was researched from three aspects such as transaction mode, trade mode and pricing mode. Research result indicates that through intergrating social resources or developing value-added services, traditional automobile manufacturing enterprise can build platform business mode and form the total solution based on the combination of production and value-added service, can create new competitive advantage, and can accelerate the transformation process from traditional automobile manufacturing enterprise to service-oriented manufacturing enterprise.
Li S.G.,Shaanxi Automobile Group Co. |
Sharkh S.M.,University of Southampton |
Sharkh S.M.,HiT Systems Ltd. |
Walsh F.C.,University of Southampton |
Zhang C.N.,Beijing Institute of Technology
IEEE Transactions on Vehicular Technology | Year: 2011
Fuzzy logic is used to define a new quantity called the battery working state (BWS), which is based on both battery terminal voltage and state of charge (SOC), to overcome the problem of battery over-discharge and associated damage resulting from inaccurate estimates of the SOC. The BWS is used by a fuzzy logic energy-management system of a plug-in series hybrid electric vehicle (HEV) to make a decision on the power split between the battery and the engine, based on the BWS and vehicle power demand, while controlling the engine to work in its fuel economic region. The fuzzy logic management system was tested in real time using an HEV simulation test bench with a real battery in the loop. Simulation results are presented to demonstrate the performance of the proposed fuzzy logic energy-management system under different driving conditions and battery SOCs. The results indicate that the fuzzy logic energy-management system using the BWS was effective in ensuring that the engine operates in the vicinity of its maximum fuel efficiency region while preventing the battery from over-discharging. © 2011 IEEE.
Li S.-G.,Beijing Institute of Technology |
Li S.-G.,Shaanxi Automobile Group Co. |
Zhang C.-N.,Beijing Institute of Technology
Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology | Year: 2012
Evaluation of the state of charge (SOC) is a key technology for electric vehicle battery management. This work develops a method to establish the relationship among Coulomb efficiency, SOC and charge/discharge current (I). The curve of SOC to I (SOC-I) is provided that could supply a reasonable Coulomb efficiency during prediction. Moreover, the algorithm of adaptive unscented Kalman filtering (AUKF) is used for battery SOC evaluation. A new SOC-I-AUKF algorithm combined the AUKF algorithm with SOC-I curve is developed. During the process of SOC prediction, the new algorithm could adjust the Coulomb efficiency, process noise covariance and measurement noise covariance to reach the optimal evaluation. Experiment results indicate that the SOC-I-AUKF algorithm has better performance than UKF algorithm in prediction of absolute error, relative error and average error.
Song Y.-Q.,China University of Mining and Technology |
Deng C.,Shaanxi Automobile Group Co.
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2012
In order to study the safety of semi-rigid guard rail of transition section collided by vehicle at high speed on expressway and to enhance absorbing auto kinetic energy and rigid protection capability of guard rail of transition section, through a large number of investigations on the basis of collision accident, the flaw of current guard rail of transition section in China was analyzed. A new type of guard rail of transition section which had enough rigidity to resist the enormous energy produced by the collision between heavy vehicle and guard rail of transition section was designed. It played a better unloading result. Finite element software LS-DYNA was used to do numerical simulation about collision between vehicle and guard rail of transition section by high speed. Results show that the new type of guard rail of transition section can effectively increase safety factor of automobile and crew. Its design dimension is reasonable and realizes the effect of rigidity transition.