Abstract
Problem. A malfunction of the service braking system of a wheeled vehicle (CTS) significantly affects road safety, especially when operating multi-axle vehicles with large masses. One of the ways to increase the level of road safety of multi-axle vehicles, when braking them using a spare (emergency) braking system, is the introduction of automated adaptive braking systems into the design of the brake drive of vehicles. The definition of the limits of the use of the adaptive braking system on vehicles with many axles is almost not disclosed in the scientific and technical literature, therefore, the issue of using such a system on vehicles with a large number of axles requires additional research. Purpose. The purpose of this work is to develop a simulation model for adaptive control of the braking process of a multi-axle vehicle using a spare (emergency) braking system, taking into account the simulation of the dynamics of the drive and the variability of the adhesion properties between the tire of the vehicle wheel and the road surface. Methodology. To achieve this goal, it is necessary to develop a simulation model of the brake drive in an adaptive mode, implement a model of the interaction of the tire with the road surface, and implement a model of the braking dynamics of a multi-axle vehicle in the event of a malfunction of its service brake system. Originality. The proposed key criterion (Kr) for changing the throttle section in electro-pneumatic pressure modulators, which provide adaptive air inlet or outlet from the corresponding brake chambers of the drive, during simulation, made it possible to simulate the operation of the drive circuits in the adaptive mode. It has been established that, depending on the potential for the realization of the adhesion between the tires of automobile wheels and the road surface, the pressure in the electro-pneumatic brake drive with its adaptive regulation can be increased by no more than 0.04 MPa.
Highlights
Failure of the working brake system of a wheeled vehicle (WV) significantly affects road safety, especially during operation of multi-axle vehicles with large masses
One of the ways to increase the level of road safety of multi-axle vehicles, during their braking using a secondary braking system, is the introduction into the design of the brake drive WV automated adaptive braking systems
It is established that determining the braking efficiency of multi-axle vehicles is a difficult task, because the brake system of multi-axle WV is divided into several independent circuits [7-12], which can work differently due to the implementation of adaptive control algorithms for pneumatic brake actuators
Summary
Failure of the working brake system of a wheeled vehicle (WV) significantly affects road safety, especially during operation of multi-axle vehicles with large masses. Analysis of publications A search analysis on the Internet showed that a number of scientific papers have been devoted to the use of an adaptive brake system on the WV [1-6] Based on these studies, it is established that determining the braking efficiency of multi-axle vehicles is a difficult task, because the brake system of multi-axle WV is divided into several independent circuits [7-12], which can work differently due to the implementation of adaptive control algorithms for pneumatic brake actuators. Purpose and problem statement The purpose of this work is to develop a simulation model of adaptive control of multiaxle vehicle braking using a secondary (emergency) braking system, taking into account the simulations of drive dynamics and variability of adhesion properties between the tire of the vehicle wheel and the road surface. X – angular displacement, rad; rd – dynamic radius of the vehicle wheel, m
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