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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2006  >  6(4): 122-126
XIAO Run-mou, YE Yan-xian, ZHOU Xiao-yue, LIU Dong. Critical slope length computation of engine brake inefficacy[J]. Journal of Traffic and Transportation Engineering, 2006, 6(4): 122-126.
Citation: XIAO Run-mou, YE Yan-xian, ZHOU Xiao-yue, LIU Dong. Critical slope length computation of engine brake inefficacy[J]. Journal of Traffic and Transportation Engineering, 2006, 6(4): 122-126.
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Critical slope length computation of engine brake inefficacy

  • 1.

    Key Laboratory for Driver-Vehicle-Environment System Safety of Ministry of Communications, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    Construction Engineering Headquarters of Langmusi-Chuanzhusi Road of National Highway 213, Chengdu 610041, Sichuan, China

More Information
  • Author Bio:

    Xiao Run-mou(1963-), male, associate researcher, doctoral student, 86-29-82334320, xrm@chd.edu.cn

  • Received Date: 2006-08-10
  • Publish Date: 2006-12-25
    Abstract
  • To lower automobile traffic accident rate effectively on continuous downhill road and enhance its active safety of driving, the slope length of braking inefficacy was studied under engine braking, brake test on flat road in automobile proving ground was done, the elevated temperatures of brake drums under emergency braking case were measured, the elevated temperature model of main brake drums was established by least-squares procedure, the critical slope lengthes of automobile main brake inefficacy under engine braking on various longitudinal slopes in mountain area were deduced.Computation result indicates that when automobile runs at the safe-stable speed of 40 km·h-1 on 5% ramp and driver adopts the No.Ⅲ gear engine braking, the critical slope lengthes of front-and-aft wheel main brake inefficacy respectively are 15263 m and 12368 m, which not only satisfies running distance request, but also meets running speed request, so it is a feasible and safe driving method on long downhill.

     

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