报告包括2014年7月下半月汽车行业的国际要闻、国内要闻、区域要闻以及国际国内企业要闻综述。

关键词：汽车；公车改革；新能源汽车；电动汽车；要闻

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In the design of CAN network system,as CAN bus topology will affect network performance and cost,it is important to optimize the network topology.This paper analyzes the CAN busload based on CAN protocol,calculates the upper limit of transmission message frames in a single CAN bus.As the amount of information on the bus is increasing,a single CAN bus cannot meet the communication requirements,we put forward dividing the network into multiple homogeneous segments via multi-objective optimization method,developing a genetic algorithm strategy and solving the problem in a MATLAB platform.Finally utilize the method to design a pure electric vehicle network topology.

关键词：电动汽车；拓扑结构；优化

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Advantages of sliding mode control (SMC). It is well known that SMC is a robust method to control nonlinear and uncertain systems which has attrac-tive features to keep the system insensitive to the uncertainties on the sliding surface. The conventional SMC design approach consists of two steps. First, a sliding manifold is designed such that the system trajectory along the man-ifold acquires certain desired properties. Then, a discontinuous controller is designed such that the system trajectories reach the manifold in finite time. As a general design tool for control systems, SMC has been well established, and the primary advantages of which are: Ⅰ) fast response and good transient performance; Ⅱ) robustness against a large class of perturbations or model uncertainties; and Ⅲ) the possibility of stabilizing some complex nonlinear systems which are difficult to be stabilized by continuous state feedback laws.

关键词：控制器；飞行器；复合控制

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2014年6月，汽车产销环比略有下降，产量同比保持较快增长，但由于市场需求回升乏力，销量同比增长略显缓慢。乘用车产销同比继续保持快速增长势头，商用车市场依旧低迷，产销量环比、同比均明显下降。中国品牌乘用车市场占有率环比、同比均继续下降，小排量乘用车市场份额也较上月及上年同期水平略有降低。6月，我国汽车企业出口情况依然不佳，尽管出口量环比有所上升，但同比仍未摆脱下滑局面。全国汽车市场价格稳中小幅波动，其中国产汽车价格保持稳定，进口汽车价格继续小幅下行。2014年1-5月，汽车工业重点企业（集团）主要经济指标保持不同程度增长，与1-4月相比，利润总额增长速度有较为明显的回落。

关键词：汽车行业；运行分析

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This paper proposes a wheel slip control strategy for 4WD Electrical Vehicle with In-wheel Motors.In the first part of this paper,a brief introduction of sliding mode control for acceleration slip regulation is given.Consider that its control effect varies with road conditions,another algorithm which can automatically adapt to different roads is designed.This method takes advantage of the peculiarity of the longitudinal static tire force curve and regulates wheel slip ratio to the detected optimal value,aiming to maximize the traction force while preserving sufficient lateral tire force.Simulation results show that the slip rate can be regulated to a value around the optimal slip ratio,and the driving torque is very close to the maximum transmissible torque.The control strategy achieves stronger stability,shorter driving distance and hence better control performance.    

关键词：电动汽车；四轮驱动；防滑控制

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Design of state-of-the art crane mechanisms involves a multi-stage and multi-criterial optimization. Depending on the specificity and intended use of the machine, the optimal structure and dimensions of its mechanisms are sought as well as optimal algorithms for drive control and regulation, which requires the application of optimization criteria. It appears, however, that the approach relying on the minimum of a specifically formulated quadratic functional enables the selection of optimal geometric parameters of the mechanism and, besides, proves effective as the method of drive control. Furthermore, the geometric parameters of the mechanism can be optimized for its entire working range. Simplicity, universality and efficiency of the method are demonstrated on the example of a slewing one-link jib crane system. The search for the optimal control strategy of drive mechanisms is illustrated in the study that investigates an asymmetrically loaded platform suspended on ropes and people moving with respect to it during the hoisting phase.

关键词：控制器；起重机；机制优化选择

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The parameters matching of the hybrid powertrain system of the hybrid electric vehicle has a directly impact on the performance of the vehicle dynamic and the fuel economy.The preliminary match of the powertrain system base on analysis of Driving Cycle is done,then the software of AVL-Cruise and Matlab are integrated with Isight to optimize parameters of match,by using the Multi-Island GA and NLPQL to establish the combinatorial optimization algorithm.The results show that the fuel economy have been improved by 10.92％ without sacrificing the dynamic performance and under the premise of ensuring the limits of the state of charge of battery.

关键词：电动汽车；并联式；混合动力；系统匹配；系统优化

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The battery quick exchange mode is an effective solution to resolve the battery charging problem of electric vehicle.For the electric vehicle battery distribution network with the battery quick exchange mode,the distribution model and algorithm are researched; the general mathematical model to take delivery of the vehicle routing problem with time window (VRP-SDPTW) is established.By analyzing the relationship between the main variables,structure priority function of the initial population,a new front crossover operator,swap mutation operator and reverse mutation operator are designed,and an improved genetic algorithm solving VRP-SDPTW is constructed.The algorithm could overcome the traditional genetic algorithm premature convergence defects.The example shows that the improved genetic algorithm can be effective in the short period of time to obtain the satisfactory solution of the VRP-SDPTW.

关键词：电动汽车；车辆路径问题；物流分配算法

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The structure design and pressure control of electro-hydraulic braking system (EHB) is essential for electric vehicles,which is critical to the braking energy recovery and vehicle stability control.In this paper,the overall structure of the electro-hydraulic braking system is analyzed,and classification method according to how the braking pedal is decoupled with the braking pressure is proposed.Through the PID control method to achieve pressure following control,it lays the foundation for electric vehicle stability control.

关键词：电动汽车；电液制动；压力控制系统

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Since a control loop may exhibit poor performance for various reasons, it is not only important to detect poor performance, but the challenge is to trace the bad performance to its root cause. Not only controller design and tuning but also other elements in the control systems, such as sensors and actuators, are often responsible for the poor performance. There are many reasons for poor control performance, which can be detected using specialised methods and indices, without requiring the knowledge of time delays or model identification.

关键词：控制器；振荡控制；回路检测

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