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Liu, Shuai
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A Lane-Changing Decision-Making Method for Intelligent Vehicle Based on Acceleration Field

SAE International Journal of Passenger Cars - Electronic and Electrical Systems

Jilin University-Bing Zhu, Shuai Liu, Jian Zhao
  • Journal Article
  • 2018-01-0599
Published 2018-04-03 by SAE International in United States
Taking full advantage of available traffic environment information, making control decisions, and then planning trajectory systematically under structured roads conditions is a critical part of intelligent vehicle. In this article, a lane-changing decision-making method for intelligent vehicle is proposed based on acceleration field. Firstly, an acceleration field related to relative velocity and relative distance was built based on the analysis of braking process, and acceleration was taken as an indicator of safety evaluation. Then, a lane-changing decision method was set up with acceleration field while considering driver’s habits, traffic efficiency and safety. Furthermore, velocity regulation was also introduced in the lane-changing decision method to make it more flexible. Afterwards, the polynomial trajectory planning method was matched up with this lane-changing decision-making method and simulations based on Matlab/Simulink were finally conducted to verify the method presented in this article. As the simulation results showed, adopting the lane-changing decision-making method based on acceleration field, the lane-changing measurements such as starting position, span and driving speed can be optimized with driver’s habits involved. At the same time, the…
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Effect of Two-Stage Valve Lift for Fuel Economy and Performance on a PFI Gasoline Engine

EMS Automotive-Gong Li
Tongji Univ.-Sunyu Tong, Xianjing Li, Shuai Liu, Jun Deng, Zongjie Hu, Liguang Li
Published 2014-10-13 by SAE International in United States
Reducing the pumping loss, and thus, the fuel consumption of gasoline engine at part load, a two-stage intake valve lift system was implanted into a PFI engine. A corresponding engine model was set up with GT-power as well, which can simulate the effect of two-stage intake valve lift and different EGR rates on fuel economy performance and on combustion condition of a gasoline engine. Based on simulation results, the valve lift control strategy and EGR control strategy was studied in this paper. Results showed that at low engine speed, when SMALL LIFT was used, the tumble flow and the combustion process in cylinder was improved and burn time duration became shorter, resulting in higher indicated efficiency and lower fuel consumption than by LARGE LIFT. With the introduction of the exhaust gas recirculation (EGR), lower fuel consumption was acquired. With the increase of EGR rate, the knock tendency and cylinder peak pressure were decreased and the combustion phase was retarded, resulting in increase of fuel consumption.
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