专利名称：Four-wheel steering system for vehicle发明人：Hirotaka Kanazawa,Masaki Watanabe,Shigeki
Furutani,Yoshihiro Watanabe,TeruhikoTakatani,Shunsuke Kawasaki,NoritakaYasuda,Akihiro Watanabe
申请号：US06/874687申请日：19860616公开号：US04733878A公开日：19880329
摘要：A four-wheel steering system for a vehicle comprises a steering wheel, a frontwheel turning mechanism for turning the front wheels in response to operation of thesteering wheel, a rear wheel turning mechanism including a rear wheel steering ratiodetermining circuit for determining the rear wheel steering ratio and an actuator forturning the rear wheels according to the rear wheel steering ratio determined by therear wheel steering ratio determining circuit. The four- wheel steering system is providedwith a road condition sensor for detecting road surface conditions which can weaken theroad gripping force of the wheels and a rear wheel steering ratio controller for changingthe rear wheel steering ratio determined by the rear wheel steering ratio determiningcircuit so that the rear wheel steering ratio is increased when the road condition is suchthat the road gripping force of the wheels can be weakened.
申请人：MAZDA MOTOR CORPORATION
代理人：Gerald J. Ferguson, Jr.,Michael P. Hoffman,Michael J. Foycik, Jr.
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