Rear Wheel Steering System with Target Characteristic of Vehicle Slip Angle

Shogi Fukukawa･Yoshiaki Tsuchiya (AISIN)･Yoshitaka Fujita (Toyota Motor)･Takuya Yamamoto (AISIN)

It is known that during low-speed maneuvers, the vehicle body tends to turn outward relative to the direction of travel.
We believed that bringing the vehicle body closer to the direction of travel would reduce the amount of eye movement for the driver and improve safety.
In this study, we evaluated the head and eye movements of drivers using driving simulators and actual vehicles, and found that there is an optimal value for the deviation between the vehicle body and the direction of travel depending on the vehicle speed.

The Influence of Vertical Suspension Friction on Planar Vehicle Dynamics

Ayumu Tanaka･Yasuji Shibahata･Makoto Yamakado･Masaki Yamamoto･Masato Abe･Yoshio Kano (Kanagawa Institute of Technology)

The effect of suspension vertical friction on vehicle planar motion was analyzed. This friction affects roll dynamics, influencing planar motion through roll steer mechanism. A new method is proposed to evaluate suspension friction's effects on vehicle behavior, resembling driver assessments under slow ramp steering conditions. which is neither a conventional steady state nor a transient response test.

Analysis of Coupled Roll and Plane Motion

Eiji Matsuura･Hideki Sakai (Kindai University)

One of the most important aspects of automobile performance evaluation is maneuverability. Since maneuverability greatly affects whether or not the car moves as the driver expects, it is an important performance in the development of a car.This study analyzed the effect of changes in the forward and backward tilt of the roll axis on roll motion.When the roll axis is tilted forward, the vehicle speed region of the roll motion around the roll axis is extended.

Quantitative Evaluation of Roll Feeling

Yuji Yoshioka･Kei Sakamoto･Jun Nakahara (Honda Motor)

A method to evaluate subjective characteristics quantitatively was investigated that is difficult to observe as physical quantities. The influence of road roughness and sensor resolution were reduced by using a driving simulator. Then, the correlation between vehicle behavior and subjective characteristics was examined by changing the vehicle behavior. As a result, it was possible to quantitatively evaluate the contribution of the phase difference between the roll and pitch angles to the feeling in turn.

Enhancement of Feeling in Turn by Control of Pitching Behavior

Naoto Ohkubo･Takashi Yanagi (Honda Motor)

In order to provide a natural feeling in turn for general drivers in daily driving, the relationship between roll behavior, pitch behavior, and turning feeling during maneuvering was studied, and a method was examined for adjusting the pitching behavior produced by control of acceleration and deceleration. Driving simulator test showed that the method is effective in enhancing the feeling in turn.