Abstract: According to the principle of collision mechanics, the determination of the instantaneous speed of frontal eccentric collision for cars in opposite directions is studied in this paper. For different collision situations, through the exchange of collision form, momentum and energy in collision, using the basic principles of mechanics and practical experience summary of related events, the speed equation of the car collision moment is listed, and the ultimate goal is to give the driving speed of the vehicles of both sides under each specific collision condition. At the same time, after giving the calculation formula, the relevant parameters involved in the vehicle speed calculation formula are also analyzed and studied and their application scope is defined. The results provide a practical way to calculate the speed for identifying the speed in road traffic accidents, so as to help and inspire the relevant practitioners in solving the problem of collision speed.

Key words: Eccentric collision; Collision mechanics; Car; Instantaneous speed

摘要： 文章依据碰撞力学原理，对于相向行驶的轿车发生正面偏心碰撞的瞬间车速确定进行 了研究。针对不同的碰撞情形，通过碰撞形态、碰撞中动量和能量的交换，运用力学基本原 理和相关事件的实用经验总结，列出轿车碰撞瞬间的车速方程式，最终得出各个特定碰撞条 件下双方车辆的行驶速度计算公式。同时，在给出了计算公式后，对车速计算公式中所涉及 的相关参数进行了分析并界定其应用范围。研究结果为道路交通事故中车速的鉴定，提供了 一条可供参考，且较为实用的车速计算途径，以期对相关从业人员在解决碰撞车速问题时有 所帮助和启发。

关键词: 偏心碰撞；碰撞力学；轿车；瞬间速度