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Beijing, China

Zou Y.,Beijing Institute of Technology | Wei S.,Beijing Institute of Technology | Ma G.,Beijing Institute of Technology | Liu Z.,Beijing Institute of Technology | Zhang D.,BAIC Motor Sales Co.
Qiche Gongcheng/Automotive Engineering | Year: 2016

To remedy the defect of adaptive cruise control (ACC) regarding the time-lag in controlling side-lane vehicle cut-in maneuver and fully utilize its original functions, a side-lane vehicle cut-in controller based on hierarchy structure is designed. The controller is then trained by fuzzy support vector machine with side-lane vehicle cut-in data acquired under real traffic environment, with a cut-in intent identifier generated for detecting the cut-in maneuver of side-lane vehicle. With the longitudinal relative distance between host vehicle and side-lane vehicle and impact remaining time as inputs, and utilizing the desired acceleration generated by fuzzy control to adjust the desired movement state of host vehicle, the dynamics control of host vehicle is fulfilled by ACC system. The results of simulation and real vehicle test show that the side-lane vehicle cut-in controller designed can work coordinately with other functions of ACC system, effectively improving the driving safety of host vehicle under the condition of cut-in maneuver of side-lane vehicle. © 2016, SAE-China. All right reserved. Source

Zhang H.,Jilin University | Qiu X.,Jilin University | Bai Y.,Jilin University | Xing F.,Jilin University | And 2 more authors.
Materials and Design | Year: 2014

In the present work, macro characteristics of the dissimilar thickness dual phase steel resistance spot welding joints were described in terms of melting rate, indentation rate, nugget diameter and indentation diameter. The results revealed that the melting rate of the DP600 side was higher than that of the DP780 side and the indentation rate of the DP600 side was lower than that of the DP780 side of the welded joints. The base metal lap order had the important effect on nugget diameter, and the DP780/DP600 spot welded joints tended to get the larger nugget diameter than DP600/DP780 spot welded joints with the same process parameters. The indentation diameters of DP600 and DP780 sides depended on the electrode geometry and force. © 2014 Elsevier Ltd. Source

Liang J.,Jilin University | Zhang H.,Tsinghua University | Qiu X.,Jilin University | Shi Y.,BAIC Motor Sales Co.
ISIJ International | Year: 2015

The characteristics of dissimilar thickness dual-phase steel DP780/DP600 resistance spot welding joints have been investigated. The experimental results reveal that the weld nugget of welded joint forms as-cast structure and consists of lath martensite with little ferrite, while the heat affected zone (HAZ) near the base metal of welded joint softened. The failure location of the welded joint initiates from the DP780 in the tensile-shear test, and the proper criterion of nugget diameter to ensure the pullout failure mode should be equal to 5.5√t (where t is the average thickness of both base metals in mm). The dual-phase steel spot-welding is prone to expulsion. Expulsion at the electrode/workpiece interfaces affects the surface quality; expulsion from the faying surface doesn't decrease peak load, but increases the indentation rate of the welded joints. Compared to welding time and electrode force, expulsion is more sensitive to weldng current. © 2015 ISIJ. Source

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