Research of Speed Model and Simulation Based on Vehicle Braking Tyre Imprint

For accurately calculating the former speed of vehicle braking, by analyzing the vehicle wheels braking-forces, and considering the changing position of gravity center and the speed changing of braking-force during time increasing, constructing the vehicle speed calculating models which is based on tyre imprint. Considering the variety types of tyre printing on accident site and the requirements for quickly and accurately collecting data, according to the modifying coefficient of the braking tyre imprint and braking-force increasing coefficient, applying the energy balance law. Calculated the braking-force increasing coefficient by the real data, compared with the real vehicle speed, the vehicle speed that is calculated by the vehicle speed model and the original model through the data, it is proved the effectiveness and accuracy for the new method.