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Cai L.,Tongji University | Wang P.,Tongji University | Wang C.,Tongji University | Wang X.,Tongji University | Zou Q.,Shanghai Automotive Industry Corporation
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

The vehicle collision warning system (CWS), enabled by recent advances in positioning systems and wireless communication technologies, plays a significant role in reducing traffic accidents. Since vehicle position is the most frequently exchanged information in vehicular networks and the key information in collision prediction, it becomes crucial to establish a strong level of trust in the positions, especially in active safety applications. To this end, in this paper we proposed a cooperative collision warning system (CCWS) based on digital map and dynamic vehicle model fusion. In CCWS, vehicles broadcast self-relevant information to neighbor vehicles periodically. In contrast to conventional methods that use only vehicle’s dynamic models, the proposed system takes the information provided by a digital map into consideration to improve the accuracy of vehicle position estimation. Each vehicle calculates whether a potential collision may occur by fusing the dynamic vehicle model, digital map and the information received. If such a dangerous situation is predicted, an alarm will be triggered to inform the driver. Our experiment results show that the CCWS has a better performance in vehicle position estimation and collision prediction compared with the CWS without considering cooperation. © Springer International Publishing Switzerland 2015. Source


Zhang H.,Tongji University | Zhang H.,Shanghai Automotive Industry Corporation | Zhong Z.,Tongji University | Chen X.,Tongji University
International Journal of Automotive Technology | Year: 2015

In the process of mechanism creative design, structure synthesis is the primary and the most important issue. This paper proposes a systematic and automatic synthesizing method of fixed-axle gear sets by means of morphological analysis. And the process is implemented to synthesize Electrified Mechanical Transmission (EMT) schemes which are parallel hybrid electric transmission composed of fixed-axle gear sets. First, independent design parameters as well as feasibility constraints and consistency conditions are defined by analyzing the structure and functions of EMT. According to these boundary conditions, structure variables such as the quantity of components and their connection relationship are solved. Then, the scheme quantity of each structure type is synthesized. Secondly, based on the abstraction of practical mechanisms with topology models, the corresponding adjacency matrixes are derived, and they are used to filtering unqualified schemes and retrieve all potential transmission paths of the remaining schemes. These potential transmission paths are further used to find out the layout and operating mode of each scheme. Finally, all schemes satisfying the structural and functional requirements are synthesized. For example, one EMT prototype is built based on one of the final schemes found and an ICE car is modified to adapt to such transmission. Vehicle test results verify the effectiveness and feasibility of the chosen transmission scheme. © 2015, The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg. Source


Li Y.-P.,Tongji University | Liu H.-J.,Tongji University | Tong R.-H.,Shanghai Automotive Industry Corporation
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2011

To realize lightweight scheme selection for car-body effectively, a method of lightweight scheme selection for car body based on multi-objective satisfaction decision mechanism was proposed. Based on the data performance analysis of the different schemes, aiming at weight reduction, cost deduction, and performance improvement, measuring weight coefficient of every object according to the importance for the lightweight scheme selection, the multi-objective optimization of the lightweight scheme selection was constructed. Multi-objective satisfaction decision mechanism was introduced to evaluate the general satisfaction of different lightweight schemes, and the largest satisfaction scheme with validation as the appropriate scheme was obtained. The effectiveness of this scheme was verified by the case of the car body engine hood. Source


Guo R.,Tongji University | Cao C.,Tongji University | Mi Y.,Tongji University | Huang Y.,Shanghai Automotive Industry Corporation
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering | Year: 2016

The electrification of vehicles has caused a great change in the characteristics of noise, vibration and harshness. A range-extended electric vehicle has complicated noise and vibration problems because it behaves both like a traditional vehicle and like a battery electric vehicle as well as having its own specific noise, vibration and harshness properties. Therefore, increasing attention should be paid to these issues. This paper is intended as a contribution to the current research on the noise, vibration and harshness of a range-extended electric vehicle. The electric driveline, the auxiliary power unit and the accessories, including the power steering pump, the electric vacuum pump and the air conditioner compressor, are tested and their noise, vibration and harshness performances are analysed. The results indicate that the high-frequency noise of the electric driveline and the vibrations of the auxiliary power unit and the air conditioner compressor are crucial noise, vibration and harshness issues of a range-extended electric vehicle. Some improvement methods are implemented or proposed for better comfort in the passenger compartment. Application of a material which is sound insulating and sound absorbing proved to be an effective countermeasure. The design and refinement of a vibration isolation system for the auxiliary power unit and the air conditioner compressor are of great importance. A reduction in the low-frequency torsional resonance of the auxiliary power unit shaft during a start-stop process is a new problem compared with that of a conventional engine. It is necessary to find a well-balanced compromise between the expected acoustic feedback and the power demand. © Institution of Mechanical Engineers. Source


Yao J.H.,Hubei Key Laboratory of Advanced Technology for Automotive Components | Wang Z.R.,Hubei Key Laboratory of Advanced Technology for Automotive Components | Lu Q.,Shanghai Automotive Industry Corporation
Advanced Materials Research | Year: 2014

In this research, a virtual cab package model had been established in CATIA which was used for driving posture prediction in RAMSIS. 40 cab package schemes and the corresponding driving postures could be acquired by adjusting the parameters of the steering wheel, the clutch pedal and the seat. The quantitative analysis between cab package parameters and driving posture was researched using regression method. And the regression functions that clearly express the relationship between them were concluded, which could be used for directing the design and optimization of the cab package schemes. © (2014) Trans Tech Publications, Switzerland. Source

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