Abstract:

Objective To establish a method of calculating vehicle speed by brake coordination time in vehicle speed estimation. Methods Detailed calculation procedures and the formation of errors were explained with a set of data. Results Brake coordination time should be a valid factor in determining the boundary values of the initial braking speed. Conclusion The initial braking speed can not be obtained directly by brake coordination time， but with this parameter， the result can be more accurate.

Key words: brake coordination time, mean fully developed deceleration （MFDD）, braking track, vehicle speed

摘要：

目的 介绍通过制动痕迹计算车速中，对制动协调时间内的速度减少值进行计算的方法。方法 以一组车辆动态检验的数据为例，对具体的计算方法、误差的形成说明分析。结果 在计算制动初速度时，制动协调时间可以作为确定速度边界值的因素参与计算。结论 不能单一地从制动协调时间推算出制动初速度，但制动协调时间内的速度减少值可以使计算更准确。

关键词: 制动协调时间, 充分发出的平均减速度, 制动痕迹, 车速