무향 칼만 필터를 이용한 타이어 수직하중 변화 추정

Abstract

In this study, we present an estimator of vertical tire forces based on Unscented Kalman Filter(UKF) to improve the performance of the chassis control. When the vehicle is maneuvered to change lanes, the vertical load transfer caused by the centrifugal force can affect cornering stability and rollover. In the previous study, a Kalman Filter with a fixed gain, obtained from infinite horizon, has been conventionally used. However, this estimator does not fully compensate for the model’s uncertainty on slippery road conditions. To reflect the model’s uncertainty effectively, this paper is proposing a new estimator of vertical tire forces with UKF. Moreover, to reflect roll behavior on the low road friction coefficient accurŀately, we used roll rate information. The effectiveness and the performance of the proposed method were validated by using CarSim for vehicle dynamics.