Steering device for vehicles

Abstract

Abstract PURPOSE:To secure stable turning performance, by estimating a friction factor lying between a road surface and a tire tread according to a detection value on a factor showing a running state, while controlling turn-steering operation on rear wheels according to this friction factor, in case of a steering device which makes a turn-steering angle for each rear wheel controllable. CONSTITUTION:In case of a device which operates rear wheel turn-steering information at a computer 12 in which each output signal out of a lateral acceleration sensor 13 and a front wheel turn-steering angle sensor 14 or the like is inputted, and turns and steers rear wheels 11 through a servo actuator 8 according to the operation result, each of estimated lateral acceleration data alpha1-alphan lying between a road surface and a tire tread is found according to a front wheel actual steering angle by the said sensor 14. Next, measured lateral acceleration data alpha0 by the said sensor 13 is compared with the said data alpha1-alphan, and among these data, the estimated lateral acceleration data being most approximate to that data alpha0 is selected and thereby derives the corresponding friction factor. And, according to this friction factor, control information on the rear wheel turn-steering is calculated, controlling it on the basis of this control information.

Inventors

• 👤 Shoichi Sano
• 👤 佐野　彰一
• 👤 Osamu Furukawa
• 👤 修 古川

Bibliographic Details