This paper proposes an emergency locking unit (ELU) for a seat belt retractor which is mounted on the back frame of a vehicle seat. The proposed unit uses a recliner sensor based on a MEMS acceleration sensor and solenoid mechanism. The seat has an upper frame supported to tilt on a lower frame. The retractor in belt in seat (BIS) system is supported by the upper frame. The proposed recliner sensor based on a MEMS acceleration sensor comprises orientation means for maintaining a predetermined orientation of emergency relative to the lower frame independently of the force of gravity when the upper frame tilts on the lower frame. Experimental results show that the developed recliner sensor unit operates effectively with respect to rollover angles. Thus, the developed unit will have a considerable potential to offer a new design concept in BIS system.
References
[1]
Autoliv. Autoliv seat belts fitted to new Renault Megane. AutoTechnology？2002.
[2]
Haland, Y. The evolution of the three point seat belt from yesterday to tomorrow. Autoliv Research, 2002. Available online: http://www.autoliv.com/wps/wcm/connect/70eb73804ce4f371a8b9eef594aebdee/ALV-Report-BertilAldmanLecture-2006Sep.pdf?MOD=AJPERES (accessed on 13 April 2010).
[3]
Hassan, A.; Morris, A.; Welsh, R. Some Characteristics of side impact crashes involving modern passenger vehicles. Available online: http://www.ukccis.com/downloads/download_publication.asp?file=publications/ICrash_200621406-rw2.PDF (accessed on 13 April 2010).
[4]
Farmer, C.M.; Wells, J.K.; Werner, J.V. Relationship of head restraint positioning to driver neck injury in rear-end crashes. Proceedings of Compendium of the Whiplash Associated Disorders World Congress, Vancouver, BC, Canada, February 7–11, 1999.
[5]
Welcher, J.B.; Szabo, T.J. The relationship between seat properties and human subject kinematics in rear impact tests. Proceedings of Compendium of the Whiplash associated Disorders World Congress, Vancouver, BC, Canada, February 7–11, 1999.
[6]
Song, D.; Uriot, J.; Trosseille, P.; Mack, C.; Tarriere, C.; Got, C.; Domont, A. Modeling and analysis of interactions between occupant, seatback and headrest in rear impact. Proceedings of International Conference on the Biomechanics of Impact (IRCOBI), Dublin, Ireland, September 11–13, 1996.
[7]
Balci, R.; Vertiz, A. Delphi automotive systems, comfort and usability of the seat belts. ？2001.
[8]
Borde, P. Pyrotechnic knee bolster development and its contribution to car drivers safety. ？2001.
[9]
Viano, D.C. Energy transfer to an occupant in rear crashes: effect of stiff and yielding seats. ？2003.
[10]
Autoliv Home Page. http://www.autoliv.com (accessed on 13 April 2010).
[11]
Delphi Home Page. http://www.delphi.com (accessed on 13 April 2010).
[12]
Zhou, R.; Hong, W.; Lakshminarayan, V. Design targets for seat integrated restraint systems for optimal occupant protection. ？2001.
[13]
Park, S.; Jeon, M. A study on improvement of crash discrimination performance for offset and angular crash events using electronic X-Y 2-axis accelerometer. Trans. Korean Soc. Autom. Eng？2003, 11, 128–136.
[14]
Song, C.M.; Lee, J.W. Autocalibration method of three-axis micromachined accelerometers. Proceedings of KIPE Power Electronics Conference, Jeju, Korea, June 22–24, 2006; pp. 302–304.
