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Study on Vehicle Deceleration Control in School Zones by Taking Driver's Comfort into Account

스쿨 존에서 운전자의 승차감을 수반한 차량 감속 제어에 관한 연구

  • Cho, Hyo-Seung (Dept. of Mechanical and Automotive Engineering, Ulsan Univ.) ;
  • Kim, Hyoung-Seok (Dept. of Mechanical and Automotive Engineering, Ulsan Univ.) ;
  • Lee, Byung-Ryong (Dept. of Mechanical and Automotive Engineering, Ulsan Univ.)
  • 조효승 (울산대학교 기계자동차공학부) ;
  • 김형석 (울산대학교 기계자동차공학부) ;
  • 이병룡 (울산대학교 기계자동차공학부)
  • Received : 2010.02.01
  • Accepted : 2010.07.26
  • Published : 2010.10.01

Abstract

Recently, many electronic control techniques for vehicles have been developed and applied. One of the technologies can be X-by-wire such as throttle-by-wire, brake-by-wire, steer-by-wire, and etc, in which most of mechanical parts are replaced into electrical wire and actuators. In this study, the effect of throttle-by-wire and brake-by-wire control systems on vehicle velocity control, especially in a school zone, are taken into consideration. The number of accidents reported in school zones is higher than that in other places. The reason for this is that many vehicle drivers do not obey speed limit regulations. Moreover, some of the students are careless while crossing the streets. Therefore, in this study, we attempt to develop a method using throttle-by-wire and brake-by-wire control systems for automatically reducing the vehicle speed such that it will be within the speed limit. First, an engine model and a transmission system model are developed for a specific vehicle model. Second, speed reduction is carried out such that the reduction follows a pre-designed cubic spline trajectory; the trajectory is determined such that rapid deceleration, which causes discomfort to the driver and passengers, can be prevented, for which a fuzzy-PID control algorithm is applied for the trajectory following control. Finally, simulation results are presented to verify the performance of the proposed speed reduction control system.

Keywords

Vehicle Deceleration Control;Fuzzy-PID Controller;Trajectory Following Control;Throttle-by-Wire;Brake-by-Wire

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