公开(公告)号：US4821830A

公开(公告)日：1989-04-18

申请号：US103070

申请日：1987-09-30

申请人： Atsuo Tomoda ,  Takao Kijima ,  Muneharu Yamada ,  Takaaki Itoh

发明人： Atsuo Tomoda ,  Takao Kijima ,  Muneharu Yamada ,  Takaaki Itoh

IPC分类号： B62D7/15 ,  B62D6/02

CPC分类号： B62D7/1563

摘要： In an automotive vehicle having front and rear wheel pairs and a steering wheel drivingly coupled with the front wheel pair for steering the vehicle with respect to the direction of run of the vehicle, said steering wheel being rotatable in any one of the opposite directions from a neutral position at which the vehicle can run straightforward, an automotive four wheel steering system is provided with a right-hand rear wheel turning structure for turning the right-hand rear wheel in a direction in which the toe-in takes place, a left-hand rear wheel turning structure for turning the left-hand rear wheel in a direction in which the toe-in takes place, a right-hand rear wheel toe-out stopper for mechanically preventing the right-hand rear wheel from turning in a direction in which the toe-out takes place, a left-hand rear wheel toe-out stopper for mechanically preventing the left-hand rear wheel from turning in a direction in which the toe-out takes place, and a rear wheel operating structure for operating either one of the right-hand and left-hand rear wheel turning structure in response to running conditions of the vehicle.

公开(公告)号：US4941542A

公开(公告)日：1990-07-17

申请号：US363432

申请日：1989-06-07

申请人： Atsuo Tomoda ,  Takaaki Itoh ,  Takao Kijima

发明人： Atsuo Tomoda ,  Takaaki Itoh ,  Takao Kijima

IPC分类号： B62D7/15

CPC分类号： B62D7/1563

摘要： An automotive vehicle having a fluid-operated, four wheel steering system for steering not only the front wheel pair, but also the rear wheel pair as a function of the amount of turn of the front wheel pair with respect to the direction of straightforward run of the vehicle. The system makes use of a front cylinder operatively associated with a steering gear assembly and a rear cylinder operated by a fluid medium supplied from the front cylinder for steering the rear wheel pair. In order for the steering system to be responsive to the vehicle running speed thereby to control the amount of turn of the rear wheel pair appropriate for a particular range of vehicle running speed, a device is provided for accommodating a portion of the fluid medium to be supplied to the rear cylinder when the pressure of the fluid medium increases to a value higher than a predetermined pressure. Increase of the fluid pressure over the predetermined value takes place when the steering wheel is turned during the low speed run of the vehicle.

摘要翻译： 一种具有流体操作的四轮转向系统的机动车辆，用于不仅前轮对的转向，而且还具有作为前轮对相对于直接行驶方向的转弯量的函数的后轮对 机动车。 该系统使用与舵机组件可操作地相关联的前缸，以及由从前缸供应的用于转向后轮对的流体介质操作的后缸。 为了使转向系统响应于车辆行驶速度，从而控制适合于特定车辆行驶速度范围的后轮对的转弯量，设置有用于容纳一部分流体介质的装置 当流体介质的压力增加到高于预定压力的值时供给到后筒。 当在车辆的低速行驶期间转向时，发生超过预定值的液压的增加。

公开(公告)号：US5020619A

公开(公告)日：1991-06-04

申请号：US466543

申请日：1990-01-17

申请人： Hirotaka Kanazawa ,  Hiroshi Ohmura ,  Atsuo Tomoda ,  Akihiro Furuzawa ,  Takashi Nakashima ,  Masao Hideshima

发明人： Hirotaka Kanazawa ,  Hiroshi Ohmura ,  Atsuo Tomoda ,  Akihiro Furuzawa ,  Takashi Nakashima ,  Masao Hideshima

IPC分类号： B62D7/15

CPC分类号： B62D7/159

摘要： A rear wheel steering device for a vehicle has a steering control mechanism which steers rear wheels of the vehicle on the following formula:TG.theta..sub.R =-K.sub.F .multidot..theta..sub.F +K.sub.R .multidot.V.multidot..psi.whereTG.theta..sub.R : target steering angle of rear wheels.theta..sub.F : steering angle of front wheelsV: vehicle speed.theta.: yaw rateK.sub.F, K.sub.R : coefficients determined by the properties of vehicle.To achieve slip angle .beta.=0, the device further includes a vehicle condition detecting mechanism which detects various conditions of the vehicle, and a changing mechanism being connected with the steering control mechanism and the vehicle condition detecting mechanism for changing at least one of the coefficients K.sub.F, K.sub.R based on the conditions of the vehicle.

公开(公告)号：US5227974A

公开(公告)日：1993-07-13

申请号：US661198

申请日：1991-02-27

申请人： Atsuo Tomoda ,  Shin Takehara ,  Ryuya Akita

发明人： Atsuo Tomoda ,  Shin Takehara ,  Ryuya Akita

IPC分类号： B62D6/00 ,  B62D5/04 ,  B62D7/14 ,  B62D7/15 ,  B62D101/00 ,  B62D111/00 ,  B62D113/00 ,  B62D137/00

CPC分类号： B62D7/159

摘要： A rear wheel turning system for a four-wheel steered vehicle includes a rear wheel turning mechanism for turning the rear wheels of the vehicle, a front wheel turning angle sensor which detects a turning angle of front wheels .theta..sub.F, a vehicle speed sensor which detects a vehicle speed V, a yaw rate detector which detects a yaw rate .PSI. of the vehicle, a yaw acceleration detector which detects a yaw acceleration .PSI. of the vehicle, and a control unit which causes the rear wheel turning mechanism to turn the rear wheels by a target rear wheel turning angle TG.theta..sub.R which is defined by formulaTG.theta..sub.R =-K.sub.1 .theta..sub.F +K.sub.2 .multidot.V.multidot..PSI.+K.sub.3 .multidot.V.multidot..PSI.wherein K.sub.1, K.sub.2 and K.sub.3 respectively represent positive coefficients. The coefficient K.sub.3 is increased with increase in the vehicle speed V over a predetermined range of vehicle speed where the coefficient K.sub.2 is constant.

摘要翻译： 用于四轮转向车辆的后轮转向系统包括用于转动车辆后轮的后轮转向机构，检测前轮theta F的转动角度的前轮转向角度传感器，检测 车速V，检测车辆的偏航率PSI的偏航率检测器，检测车辆的偏航加速度PSI的偏航加速度检测器以及使后轮转向机构将后轮转动的控制单元 由公式TGθR = -K1°F + K2xVx PSI + K3xVx PSI定义的目标后轮转向角TGθR，其中K1，K2和K3分别表示正系数。 在系数K2恒定的车速的预定范围内，系数K3随着车速V的增加而增加。