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    Four-wheel steering system for vehicle
    1.
    发明授权
    Four-wheel steering system for vehicle 失效
    车辆四轮转向系统

    公开(公告)号：US5341294A

    公开(公告)日：1994-08-23

    申请号：US748838

    申请日：1991-08-23

    申请人： Hirotaka Kanazawa ,  Takeshi Edahiro ,  Hiroki Yoshioka ,  Nobuhiro Totoki ,  Hiroyuki Noda ,  Takashi Nakashima ,  Hiroshi Ohmura ,  Takeshi Murai ,  Ryuya Akita

    发明人： Hirotaka Kanazawa ,  Takeshi Edahiro ,  Hiroki Yoshioka ,  Nobuhiro Totoki ,  Hiroyuki Noda ,  Takashi Nakashima ,  Hiroshi Ohmura ,  Takeshi Murai ,  Ryuya Akita

    IPC分类号： B62D7/15 ,  B62D5/06 ,  B62D6/02

    CPC分类号： B62D7/1545 ,  B62D7/1518 ,  B62D7/159

    摘要： In a four wheel steering system, the rear wheel turning mechanism is connected to the front wheel turning mechanism by way of a rear wheel turning angle ratio changing mechanism which is mechanically connected to both the front wheel turning mechanism and the rear wheel turning mechanism and transmits the mechanical displacement input thereinto from the front wheel turning mechanism to the rear wheel turning mechanism to drive the same by an amount the ratio of which to the amount of mechanical displacement input into the rear wheel turning angle ratio changing mechanism gives a predetermined rear wheel turning angle ratio. The rear wheel turning angle ratio changing mechanism is controlled in such a way that, when the front wheels are turned from the neutral position in a middle vehicle speed range, makes the rear wheel turning angle ratio negative for a moment immediately after initiation of turning of the front wheels and thereafter turns the same positive.

    摘要翻译： 在四轮转向系统中，后轮转向机构通过与后轮转向机构和后轮转动机构机械连接的后轮转角变更机构与前轮转向机构连接， 从前轮转向机构到后轮转向机构的机械位移输入，以将其相对于输入到后轮转向角比变更机构的机械位移量的比例驱动到后轮转向机构， 角度比。 控制后轮转向角变更机构，使得当前轮在中间车速范围内从中立位置转动时，使后轮转向角比率在开始转动之后立刻为负 前轮然后转动相同的正面。

    Rear wheel turning system for four-wheel steered vehicle
    2.
    发明授权
    Rear wheel turning system for four-wheel steered vehicle 失效
    四轮转向车后轮转向系统

    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。

    System for steering rear wheels of an automotive vehicle
    4.
    发明授权
    System for steering rear wheels of an automotive vehicle 失效
    用于转向机动车辆后轮的系统

    公开(公告)号：US5316098A

    公开(公告)日：1994-05-31

    申请号：US856697

    申请日：1992-03-24

    申请人： Ryuya Akita ,  Shigefumi Hirabayashi

    发明人： Ryuya Akita ,  Shigefumi Hirabayashi

    IPC分类号： B62D6/00 ,  B62D7/15 ,  B62D101/00 ,  B62D113/00 ,  B62D137/00 ,  B62D5/06

    CPC分类号： B62D7/1518 ,  B62D7/159

    摘要： A system for steering a rear wheel of a vehicle having a mechanism for altering a steering ratio, .THETA.S, based on an amount of steering of the rear wheel to an amount of steering a front wheel. The system is disposed in an interconnecting mechanism for mechanically interconnecting the mechanism for steering the front wheel with the mechanism for steering the rear wheel. The value of .THETA.S is set by the following formula:.THETA.S=C1+B.multidot.C3.multidot..vertline.Y.vertline.-C4.multidot..vertline.dY.vertline.where .THETA.S is a steering ratio;Y is a yaw rate of a vehicle body;dY is a yaw acceleration of the yaw rate;C1 is a basic steering characteristic term;C3 is a yaw rate control gain;C4 is a yaw acceleration control gain; andB is a correction coefficient control gain term.The value of B increases when the amount of steering of the front wheel is small and decreases when the amount of steering of the front wheel is large.

    摘要翻译： 一种用于转向车辆后轮的系统，具有用于根据后轮的转向量与前轮的转向量来改变转向比THETA S的机构。 该系统设置在互连机构中，用于机械地互连用于转向前轮的机构与用于转向后轮的机构。 THETA S的值由以下公式设定：THETA S = C1 + BxC3x | Y | -C4x | dY | THETA S是转向比; Y是车体的偏航率; dY是偏航率的偏航加速度; C1是基本的转向特征术语; C3是偏航率控制增益; C4是偏航加速度控制增益; B是校正系数控制增益项。 当前轮的转向量小时，B的值增加，当前轮的转向量大时，B的值减小。

    Rear wheel steering device for a vehicle
    5.
    发明授权
    Rear wheel steering device for a vehicle 失效
    车辆后轮转向装置

    公开(公告)号：US5303791A

    公开(公告)日：1994-04-19

    申请号：US769196

    申请日：1991-09-30

    申请人： Hiroyuki Hayashi ,  Toshiro Kondo ,  Fumitaka Ando ,  Hirotaka Kanazawa ,  Takeshi Edahiro ,  Ryuya Akita

    发明人： Hiroyuki Hayashi ,  Toshiro Kondo ,  Fumitaka Ando ,  Hirotaka Kanazawa ,  Takeshi Edahiro ,  Ryuya Akita

    IPC分类号： B62D7/15 ,  B62D5/04

    CPC分类号： B62D7/1581 ,  B62D7/159

    摘要： Two support members which are supported swingably to the vehicle body through the medium of the support axis extending in up and down direction are provided at the vehicle body end portions of two left and right suspension arm members connecting left and right rear wheels to the vehicle body. Lever parts are extended from the support members toward the opposing direction to each other and are interconnected by a link member. One of the two support members is driven by one actuator for rotation around an support axis, whereby left and right two suspension arm members move in vehicle widthwise direction, opposite to each other, and in synchronism with each other and thus left and right rear wheels are steered symmetrically in toe-in direction or toe-out direction. Since the motive power mechanism part is of simple construction using link members, and engaging parts of gears can be lessened, the device according to the present invention can contribute to compactness and cost reduction and also can restrict "shaking" in rear wheel steering due to backlash of gears.

    摘要翻译： 通过沿着上下方向延伸的支撑轴的介质可摆动地支撑在车体上的两个支撑构件设置在将左右后轮连接到车体的两个左右悬架臂构件的车身端部 。 杠杆部件从支撑构件朝向彼此相反的方向延伸并且通过连杆构件相互连接。 两个支撑构件中的一个由一个致动器驱动以围绕支撑轴线旋转，由此左和右两个悬架臂构件在车辆宽度方向上彼此相反地移动，并且彼此同步，因此左右后轮 对称地沿着方向或脚趾向方向转向。 由于动力机构部分使用连杆构件的结构简单，并且可以减小齿轮的接合部分，所以根据本发明的装置可以有助于紧凑性和成本降低，并且还可以限制由于后轮转向而产生的“晃动” 齿轮间隙

    Four-wheel-steered vehicle control system
    7.
    发明授权
    Four-wheel-steered vehicle control system 失效
    四轮转向车辆控制系统

    公开(公告)号：US5141071A

    公开(公告)日：1992-08-25

    申请号：US668241

    申请日：1991-03-12

    申请人： Takeshi Edahiro ,  Ryuya Akita ,  Hiroshi Ohmura ,  Takashi Nakashima ,  Takeshi Murai ,  Fumio Kageyama

    发明人： Takeshi Edahiro ,  Ryuya Akita ,  Hiroshi Ohmura ,  Takashi Nakashima ,  Takeshi Murai ,  Fumio Kageyama

    IPC分类号： B60K28/16 ,  B62D7/15

    CPC分类号： B60K28/16 ,  B62D7/159 ,  B60T2260/022

    摘要： A four-wheel-steered vehicle provided with a slip control mechanism which has a slip ratio sensor for detecting the slip ratio of the wheels and controls slip of wheels of the vehicle when the slip ratio of the wheels reaches a first preset value. The four-wheel steering mechanism turns the rear wheels according to first rear wheel turning characteristics in response to turning of the front wheels when the slip ratio of the wheels is smaller than a second preset value which is smaller than the first preset value and turns the rear wheels according to second rear wheel turning characteristics when the slip ratio reaches the second preset value.

    摘要翻译： 具有滑动控制机构的四轮转向车辆，其具有用于检测车轮的滑移比的滑移率传感器，并且当车轮的滑移比达到第一预设值时，控制车辆的车轮滑动。 当轮的滑移比小于第一预设值的第二预置值时，四轮转向机构响应于前轮的转动而根据第一后轮转向特性来转动后轮， 当滑移比达到第二预设值时，根据第二后轮转向特性的后轮。

    Steering device for rear vehicle wheels
    10.
    发明授权
    Steering device for rear vehicle wheels 失效
    后车轮转向装置

    公开(公告)号：US5257191A

    公开(公告)日：1993-10-26

    申请号：US765529

    申请日：1991-09-25

    申请人： Shin Takehara ,  Ryuya Akita ,  Hiroshi Ohmura

    发明人： Shin Takehara ,  Ryuya Akita ,  Hiroshi Ohmura

    IPC分类号： B62D7/14 ,  B62D7/15

    CPC分类号： B62D7/1581 ,  B62D7/148

    摘要： A device for steering the rear wheels of a vehicle has a first motor controlled at least with respect to the steering angle of the steering wheel, a gear change mechanism for changing gear ratios, a second motor for controlling the gear ratio by driving the gear change mechanism, a steering mechanism for steering the rear wheels by transmitting a portion of the force equal to the product of the amount that the first motor is driven and the amount that the second motor is driven, a motor failure determination device for detecting motor failure when the amount that either of the first or second motors is driven is zero and the other of the motors is operated, and a control device for controlling both motors so that when motor failure is detected in one of the motors, the amount that the other motor is driven is brought to zero. The steering device may further have a sensor for detecting the steering angle of the rear wheels, and a sensor failure detecting device which monitors the steering angle detected by the sensor, and detects a failure of the sensor when the steering angle of the rear wheel changes although the amount that one of the motors is driven is zero. Also disclosed is a process for steering the rear wheels of a vehicle.