Transient Motion Analysis Based Objective Quantification of Cornering Feedback and Its Application to Vehicle Motion Control

Abstract

The Cornering feedback from the vehicle is important information to control the path and the yaw stability, especially in limit handling situation. To improve this cornering feedback, in-depth analysis of vehicle cornering motion should be advanced. But, due to the transient characteristics of vehicle corner-ing motion, effective analysis of cornering feedback has remained as a very challenging task. In this article, 1) important properties of transient cornering motion have been studied and 2) yaw de-composition based new transient motion analysis method is proposed. This new analysis method enables separate analysis of vehicle yaw motions by its sources, from path following and from yaw spinning, which is the key element in objectification of cornering feedback. Additionally, an in-depth analysis of yaw center migration and its effect on driver feeling has been investigated. Based on these analysis methods, subjective vs. objective correlation study has been conducted and major cornering feedbacks includes carving feel have been objectively analyzed and quantified. In this article, side slip motion compliance & resistance in path following also has been investigated to analyze vehicle turn-in response. Additionally, based on this newly proposed transient motion analysis, its application idea includes active control of vehicle motion in various situations is also proposed.