Virtual Brake Pull Maneuver Development

Abstract

<div class="section abstract"><div class="htmlview paragraph">The Brake Pull phenomena is the directional deviation when a strong deceleration is applied, this happens due to asymmetries in the vehicle with diverse origins: dimensional, stiffness, damping, friction and loading condition. This phenomenon creates the necessity of driver inputs on the steering wheel adjusting the vehicle direction to keep the straight line.</div><div class="htmlview paragraph">Great part of asymmetries in the vehicle is avoidable due to building quality, correct maintenance, and others. However, an unequal loading condition on the transversal direction of the vehicle is very common: the vehicle occupied only by the driver is a usual condition. This circumstance creates a load asymmetry that can induces the brake pull phenomena.</div><div class="htmlview paragraph">This study aims to create and validate a virtual toll capable of representing the brake pull phenomena caused by a loading asymmetry. A vehicle modeled in multibody dynamics technique representing the vehicle mass inertias, suspension mechanisms kinematics, tire behavior and components dampers and stiffness is the adopted tool to represent this situation.</div><div class="htmlview paragraph">This model will be exposed to a strong deceleration (~0.85g) and verify the brake bull measuring the yaw velocity. The yaw velocity results acquired through simulation will be compared with physical results.</div></div>