Evaluation Method for Vehicle Steering Characteristics during the Transition from Straight Driving to Circular Turning

Haru Saito･Hiromasa Mochizuki･Masato Abe･Makoto Yamakado･Yoshio Kano･Masaki Yamamoto (Kanagawa Institute of Technology)

An extension of the conventional τL-based evaluation method derived from lane-change maneuvers was developed to assess the steering process from straight driving to circular turning. Full-scale vehicle tests confirmed that the corner-entry position for circular turning and the trigger position that defines the steering-onset point are key parameters. Tests with and without the control further demonstrated that the proposed method enables quantitative identification of steering characteristics during the formation of circular turning.

Influence of Suspension Ball Joints on Driver Steering Characteristics Evaluation

Yuto Kinoshita･Kei Ishitsuka (Kanagawa Institute of Technology)･Kenji Yabe･Shin Hirano (HKS)･Shogo Kawamori (Somic Ishikawa)･Masato Abe･Yoshio Kano･Masaki Yamamoto･Makoto Yamakado (Kanagawa Institute of Technology)

A vehicle equipped with a pillow-ball upper mount and a large negative camber setting showed higher subjective ratings in circuit driving when the stiffness of the front steering-side suspension ball joint was linearized compared with the normal specification. Steering characteristics were further evaluated using lane-change τL and steady-state cornering τL, through which the superiority of the linearized-stiffness specification was quantitatively confirmed.

Evaluation Method of Vehicle Steering Characteristics under Straight-Driving Disturbances

Reon SUZUKI･Haru SAITO･Kai UTSUMI･Makoto YAMAKADO･Yoshio KANO･Masato ABE･Masaki YAMAMOTO･Ikuo KUSHIRO (Kanagawa Institute of Technology)･Jun ISHIO (Honda Motor)

An extension of the conventional τL-based evaluation derived from lane-change maneuvers is proposed to assess vehicle steering characteristics under external disturbances during straight-line driving. Multiple vehicle responses and steering reaction forces were reproduced and analyzed in a driving simulator to verify the method. The results indicate that the approach complements traditional lane-change evaluations and provides a quantitative means of capturing steering behavior under disturbance inputs.

A Fundamental Interpretation of the Coupling Structure Between Steering Systems and Vehicle Dynamics

Jun Ishio (Honda Motor)･Masaki Yamamoto･Masato Abe･Makoto Yamakado (Kanagawa Institute of Technology)

The influence of steering system characteristics on vehicle dynamics in the region of small lateral acceleration during cornering is well recognized. This study introduces an analytical approach that linearizes the nonlinear properties of the steering system and evaluates the combined behavior of the steering mechanism and vehicle dynamics. The proposed method effectively captures steering response characteristics under low-frequency steering inputs, providing a robust framework for systematic analysis.

Study on Improving the Accuracy of Stroke Sensors for Steer-by-Wire EPS

Yohei Shirakawa･Yoshiaki Yanagisawa･Yukio Ikeda (PROTERIAL)

An inductive sensor resistant to external magnetic fields was adopted for the stroke sensor that directly detects the rack shaft position in steer-by-wire EPS. To enhance sensor accuracy, we proposed optimizing the receiver coil shape and applying harmonic correction. Electromagnetic field simulations verified effectiveness, reducing error from 3.60% FS to 0.22% FS.

Adaptive Yaw Rate Control Based on Cornering Detection in Electric Rear-Wheel Steering

TAEHONG KIM (Hyundai Mobis)

This paper proposes an algorithm for electric rear-wheel steering systems that detects cornering conditions and actively generates a target yaw rate, enabling drivers to maintain turning radius without corrective steering. Cornering is identified using steering angle, angular velocity, curvature, and yaw rate sign with weighted factors. Once detected, the system fixes vehicle speed smoothly and controls yaw rate based on steering angle alone. An optimized rear-wheel control angle is derived using a Sliding Mode Observer and Recursive Least Squares method.