Toyota has succeeded in developing for mass production the active four-wheel steering (4WS) system using yaw rate feedback and steering anle feedforward control. The active 4WS system consists of a group of various sensors, including the newly developed yaw rate sensor, ECU, a rear wheel steering actuator that employs a stepping motor and hydraulic valve, and other hydraulic elements, which actively control the steering angle of the rear wheels. The new system ensurs a good response and a high level of stability for quick steering even during a high-speed drive. When the vehicle deflects due to a sudden side wind, road surface disturbance, or abrupt braking, steering is automatically corrected through the rear wheels to significantly improve forward stability. In addition, the system provides improved performance in making small radius turns because the rear wheels are steering up to five degrees when the front wheels are turned to a large angle. Also, improved vehicle maneuverability at low speed is obtained.
Development of four wheel steering system using yaw rate feedback control
Entwicklung eines 4-Rad-Lenksystems mittels Abweichungsgrad-Rückkopplungsregelung
SAE-Papers ; 1-7
1991
7 Seiten, 13 Bilder, 11 Quellen
Aufsatz (Konferenz)
Englisch
Development of Four Wheel Steering System Using Yaw Rate Feedback Control
SAE Technical Papers | 1991
|Development of four wheel steering system using yaw rate feedback control
Kraftfahrwesen | 1991
|Feedback control of four-wheel steering using time delay control
Online Contents | 1998
|Feedback control of four-wheel steering using time delay control
Tema Archiv | 1998
|Feedback control of four-wheel steering using time delay control
Kraftfahrwesen | 1998
|