Estimation Parameters of Braking of Vehicles Category M1 at Definition of Circumstances Road Accidents

The study of the distribution of the deceleration of vehicles of category M1 when performing various maneuvers is intended to develop methods for assessing the parameters of maneuvering of cars in the study of the circumstances of the occurrence of road accidents. Experimental studies were carried out on passenger cars, which are equipped with automated braking force control systems, for various driving styles. M1 category vehicles were maneuvered on dry asphalt pavement in the range of speeds from 11 to 25 m / s, which is typical for most road traffic accidents. It was found that when braking a vehicle of category M1, longitudinal deceleration increase according to a second-order polynomial dependence in the range of deceleration variation from 1.39 to 5.86 m/s2. This fact is well explained by the peculiarities of the operation of automated brake force control systems that are equipped a vehicle and the psychological behavior of the driver, who carries out the process of braking the vehicle before the occurrence of the road traffic accident. It has been established that the vehicle deceleration may differ by 50-55% from the vehicle deceleration value obtained during its emergency braking in conditions not leading to a road traffic accident. The study showed that the presence in the design of a modern vehicle of category M1 of automated systems for regulating the braking force makes it possible to expand the range of its possible lateral displacements up to 65%, change the heading angle up to 82% and reduce the required longitudinal distance for maneuvering the vehicle by 25%, while maintaining stability vehicle movement.