Methodology for determining real time safety margin in a road vehicle

There are multiple factors that can compromise safety during driving such as the tire-road friction coefficient, an inadequate speed, or an aggressive driving by the driver, leading to dangerous situations for all users of the way. It is difficult to measure quantitatively the level of safety during driving and the change in it, depending, at each instant of time, of the situations that occur, changes in the adherence by a puddle of oil, soil wet from rain, sudden accelerations and brakings, which change the margin of safety available. In this paper presents a methodology that allows to determine the level of safety with which it is circulating through the use of r-stability regions used for the predictive control of vehicles. The validation of the methodology is carried out through virtual tests carried out with the MSC Adams multibody dynamic simulation software that allows reproducing the behaviour of the vehicle and knowing the values of the parameters that are necessary, such as longitudinal and lateral accelerations, yaw rate, the slips angles of the wheels, among others. (C) 2018 The Authors. Published by Elsevier Ltd.