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The analysis of the provisions of the working processes simulation modeling in the vehicle transmission is performed. The mathematical models of transmission of momentum that arises in the engine with the dependencies characterizing the process of motion of the vehicle are matched. The mathematical model of the acceleration process of a vehicle, equipped with an automatic coupling control system, is implemented. The results of modeling the operation of an automatic clutch control system during acceleration of a vehicle are obtained depending on the acceleration intensity.

The article deals with the problem of double tire interraction with the road surface. The theory of elastic deformation of tires which are parallely arranged on one axis is given. Theoretical studies as for the description of the process of double tire interaction with the road surface are presented. Analysis of changes in the rigidity, depending on the humber of tires on the wheel is carried out.

Based on the analysis of experimental data there was provided a method for determining loading on the rear wheels when the front wheels are raised. By comparing the results of calculations and experiments, it was revealed that the calculation error does not exceed 5 %. A smaller error for the actual weighted vehicles.

The basic equations of vehicles motion have been analyzed and summarized; the solving algorithm for the analysis of free movement under road conditions that are defined by the parameters of the roads technical level and its operational state was made up. The results of modeling are given.

Up-to-date vehicles are equipped by various systems of braking effort automatic control theparameters calculation of which do not as a rule have a rational solution. In order to increase theworking efficiency of such systems it is necessary to have the data concerning the impact of variousoperational factors on processes occurring at braking of the object of adjustment (vehicle wheel).Data availability concerning the impact of operational factors allows to decrease geometricalparameters of adjustment devices (modulators) and maintain their efficient operation under variousexploitation conditions of vehicle’s motion.

The method of analysis and choice of braking forces distribution between the axels of cate-gory M1 vehicles in accordance with which the minimum permissible braking intensity is provided ac-cording to regulations requirements №13 of EEC of UNO is offered.

The known methods of the realized rate of tyre coefficient of cohesion with the supporting surface at wheel rolling in the brake mode are analysed. The comparison of the obtained φ – S planes with the experimental one for the purpose of determining the most suitable method of practical calculation cohesion is carried out. It is established that the maximum (φmax) calculation coefficient of cohesion essentially depends on the vertical load applied to the wheel, and a variant allowing to calculate this phenomenon at φ – S planes calculation is offered.

The features of electronic brake systems of vehicles are analyzed.