| 초록 |
This paper describes a method of obtaining the lateral load transfer ratio(LTR) that can determine the rollover safety of the vehicle by using wheel linear accelerations. An LTR which is defined only by the vertical force of the wheels, can detect an instantaneous lateral load transfer, regardless of a sudden steering input while the vehicle is in motion. Thus, it is necessary to measure the vertical forces acting on each tire in real-time, though it is difficult to implement in practice. This paper proposes a novel approach to estimate the vertical forces by using wheel linear accelerations and a simplified vehicle dynamic model. The proposed vehicle dynamic model assumes only the rigidity of the vehicle body to convert wheel acceleration signals into the vertical forces on each tire in real-time. A signal processor and a digital filter were designed to convert the acceleration signal into the rectified vertical forces and LTR in real-time. Finally, the proposed method has been validated through road tests by using three-axis accelerometers and six-component, wheel force transducers mounted on the SUV. |
