公开(公告)号：US5249639A

公开(公告)日：1993-10-05

申请号：US915733

申请日：1992-07-24

Applicant: Jerry D. Marr ,  Howard A. Marsden ,  Noel J. Rytter

Inventor： Jerry D. Marr ,  Howard A. Marsden ,  Noel J. Rytter

IPC: B62D5/32 ,  B62D7/14 ,  B62D5/30 ,  F16B9/09

CPC classification number: B62D7/148 ,  B62D5/32

Abstract: Vehicles having front and rear pairs of steerable wheels are sometimes provided with large springs for moving one pair of the wheels to a straight-ahead position during emergency steering. Large amounts of hydraulic energy are expended solely for the compression of such springs every time the pair of wheels are steered. A back-up steering control system (19) of the present steering control arrangement (10) has a servo valve (76) operative to control the flow of pressurized fluid from a back-up pump (60) to a steering control valve (21) which in turn controls the flow of pressurized fluid from the back-up pump to a hydraulic actuator (13) to hydraulically move a first pair of steerable wheels (11) to a straight-ahead position during emergency steering conditions. A manual control valve (68) is operative to control the flow of pressurized fluid from the back-up pump (60) to another steering control valve (22) which in turn controls the flow of pressurized fluid to a hydraulic actuator (16) for effecting steering of a second pair of steerable wheels (12) during the emergency steering condition.

Abstract translation: 具有前后成对的可转向轮的车辆有时设有大的弹簧，用于在紧急转向期间将一对车轮移动到直线前进位置。 大量的液压能量仅用于在每一对转向轮时压缩这种弹簧。 本转向控制装置（10）的后备转向控制系统（19）具有伺服阀（76），该伺服阀可操作以控制加压流体从备用泵（60）到转向控制阀（21）的流动 ），其又控制加压流体从备用泵到液压致动器（13）的流动，以在紧急转向条件期间将第一对可转向轮（11）液压地移动到直线前进位置。 手动控制阀（68）用于控制从备用泵（60）到另一个转向控制阀（22）的加压流体的流动，该转向控制阀（22）进而控制加压流体流向液压致动器（16），用于 在紧急转向条件期间对第二对可转向轮（12）进行转向。

公开(公告)号：US5212641A

公开(公告)日：1993-05-18

申请号：US586604

申请日：1990-09-24

Applicant: Toru Iwata ,  Takashi Imaseki ,  Minoru Tamura ,  Yuichi Fukuyama

Inventor： Toru Iwata ,  Takashi Imaseki ,  Minoru Tamura ,  Yuichi Fukuyama

IPC: B60K28/10 ,  B60K28/16 ,  B60T8/175 ,  B62D6/00 ,  B62D7/14 ,  B62D7/15 ,  B62D101/00 ,  B62D105/00 ,  B62D113/00 ,  B62D137/00

CPC classification number: B60K28/16 ,  B60K28/10 ,  B62D7/148 ,  B62D7/159

Abstract: A rear wheel steering control system is provided. This system includes a traction control system which is responsive to generation of a difference in rotational speeds between front and rear wheels to recover traction of driven wheels and a compensating system which corrects a rear wheel steering angle, determined in a preselected relation to vehicle speed and a steered angle of the front wheels, based on the difference in rotational speeds between the front and rear wheels to provide a proper rear wheel target steering angle. The system restricts operation of the compensating system during operation of a traction control system to prevent a hunting frequency thereof from affecting the operation of the compensating system.

Abstract translation: 提供后轮转向控制系统。 该系统包括牵引控制系统，其响应于产生前轮和后轮之间的转速的差异，以恢复从动轮的牵引力;以及补偿系统，该补偿系统校正与车速预先确定的后轮转向角，以及 基于前轮和后轮之间的转速的差异，前轮的转向角度提供适当的后轮目标转向角。 系统在牵引控制系统的操作期间限制补偿系统的操作，以防止其寻呼频率影响补偿系统的运行。

公开(公告)号：US5202830A

公开(公告)日：1993-04-13

申请号：US498209

申请日：1990-03-22

Applicant: Osamu Tsurumiya ,  Masataka Izawa

Inventor： Osamu Tsurumiya ,  Masataka Izawa

IPC: B62D5/04 ,  B62D7/14

CPC classification number: B62D5/0481 ,  B62D7/148

Abstract: A PWM motor drive control circuit for an electric power steering system, comprising: a bridge circuit having four arms each defined by a transistor; a main control unit for producing a continual direction control signal and a torque control signal of a variable duty ratio to activate the electric motor in a desired direction at a desired torque according to a steering command signal supplied thereto; a sub control unit for producing a second direction control signal according to the steering command signal; and a gate drive control circuit for transmitting the first direction control signal and the torque control signal to the transistors only when the first direction control signal produced by the primary control unit coincides with the second direction control signal produced by the sub control unit. Thereby, the reliability of an electric motor powered steering system can be improved with a simple circuit structure even when the torque control signal consists of an extremely high frequency variable duty ratio signal.

Abstract translation: 一种用于电动助力转向系统的PWM电动机驱动控制电路，包括：具有由晶体管限定的四个臂的桥接电路; 主控制单元，用于产生连续方向控制信号和可变占空比的转矩控制信号，以根据提供给其的转向命令信号以期望的转矩在期望的方向上激活电动机; 子控制单元，用于根据转向命令信号产生第二方向控制信号; 以及栅极驱动控制电路，用于仅当由主控制单元产生的第一方向控制信号与副控制单元产生的第二方向控制信号一致时，将第一方向控制信号和转矩控制信号发送到晶体管。 由此，即使转矩控制信号由极高频率的可变占空比信号构成，也能够通过简单的电路结构来提高电动机动力转向系统的可靠性。

公开(公告)号：US5201382A

公开(公告)日：1993-04-13

申请号：US677528

申请日：1991-03-29

Applicant: Takeshi Edahiro ,  Ryuya Akita ,  Hiroshi Ohmura ,  Takashi Nakashima ,  Takeshi Murai

Inventor： Takeshi Edahiro ,  Ryuya Akita ,  Hiroshi Ohmura ,  Takashi Nakashima ,  Takeshi Murai

IPC: B62D6/00 ,  B60K28/16 ,  B60T8/175 ,  B60T8/1769 ,  B62D7/14 ,  B62D7/15 ,  B62D101/00 ,  B62D103/00 ,  B62D105/00 ,  B62D109/00 ,  F02D29/02

CPC classification number: B62D7/148 ,  B60K28/16 ,  B60T8/175 ,  B60T8/1769 ,  B62D7/159 ,  B60T2260/022

Abstract: A front drive vehicle is provided with a four-wheel steering system and a traction control system. A control system for the vehicle detects whether a failure occurs in the traction control system, and causes the rear wheel turning mechanism to turn the rear wheels according to corrected rear wheel turning characteristics when it is determined that a failure occurs in the traction control system. The corrected rear wheel turning characteristics are shifted toward the reverse phase side with respect to the original rear wheel turning characteristics.

Abstract translation: 前驱车辆设有四轮转向系统和牵引力控制系统。 用于车辆的控制系统检测在牵引力控制系统中是否发生故障，并且当确定在牵引力控制系统中发生故障时，使后轮转向机构根据校正的后轮转向特性转动后轮。 校正后轮转向特性相对于原始后轮转向特性向相反侧移动。

公开(公告)号：US5048627A

公开(公告)日：1991-09-17

申请号：US375629

申请日：1989-07-05

Applicant: Takaaki Eguchi ,  Norimasa Nakamura

Inventor： Takaaki Eguchi ,  Norimasa Nakamura

IPC: B62D7/14

CPC classification number: B62D7/148

Abstract: A fail-safe vehicle rear wheel steering control system includes a hydraulic actuator for steering the rear wheels, an electromagnetic control valve for controlling fluid pressure of the actuator in accordance with a control signal, and a controller for controlling the rear wheel steer angle by producing the control signal. This fail-safe control system is characterized by a fail-safe cutoff valve disposed between the actuator and the control valve, and a fail-safe controller independent from the main controller. When the main controller or the control valve fails, the fail-safe controller brings the fail-safe valve to a closed position, and therefore, the fail-safe valve prevents an abrupt change of the rear wheel steer angle, and instead gradually allows a decrease of the rear wheel steer angle to zero by allowing a gradual leakage of the oil under pressure from the actuator.

公开(公告)号：US4961144A

公开(公告)日：1990-10-02

申请号：US350291

申请日：1989-05-11

Applicant: Hideo Yabe ,  Hideo Hori

Inventor： Hideo Yabe ,  Hideo Hori

IPC: B62D5/04 ,  B62D6/00 ,  B62D7/14 ,  B62D101/00 ,  B62D113/00 ,  B62D137/00

CPC classification number: B62D7/148 ,  B62D5/0487

Abstract: In a self-check method of a four-wheel steering drive system, a relay downstream current upon ON/OFF of a relay is checked to check a state of said relay. Forward and reverse rotation control signals of a duty ratio of 0% are supplied to a predetermined combination of switching elements constituting an H bridge circuit to check if a current obtained from the predetermined combination of switching elements is an overcurrent, thereby checking a state of the H bridge circuit. When the rear wheels are turned to a target rear wheel position with reference to a present rear-wheel position, whether or not a difference between the target rear-wheel position and an actual rear-wheel position is set to be a predetermined value or less within a predetermined period of time is checked, thereby checking a state of a steering motor and a rear-wheel steering mechanism.

Abstract translation: 在四轮转向驱动系统的自检方法中，检查继电器的ON / OFF时的继电器下游电流，以检查所述继电器的状态。 占空比为0％的正向和反向旋转控制信号被提供给构成H桥电路的开关元件的预定组合，以检查从预定组合的开关元件获得的电流是否是过电流，从而检查 H桥电路。 当后轮相对于当前后轮位置转动到目标后轮位置时，目标后轮位置与实际后轮位置之间的差是否被设定为预定值或更小 检查在预定时间段内，从而检查转向电动机和后轮转向机构的状态。

公开(公告)号：US4934474A

公开(公告)日：1990-06-19

申请号：US305023

申请日：1989-02-02

Applicant: Fukashi Sugasawa

Inventor： Fukashi Sugasawa

IPC: B62D7/14

CPC classification number: B62D7/148

Abstract: A fail-safe steer angle control system includes a front auxiliary steering actuator for controlling a front wheel steering angle in response to a front control signal representing a front wheel auxiliary steering angle, a rear wheel steering actuator for controlling a rear wheel steering angle in response to a rear control signal, a steering angle sensor for sensing the steering wheel angle, and a controller which produces the front control signal based on the steering wheel angle in accordance with a predetermined first relationship, and produces the rear control signal based on the steering wheel angle in accordance with a predetermined second relationship. The controller has a fail-safe section which adjusts the first or second relationship when an abnormal condition is detected in either the front steering system or the rear steering system.

公开(公告)号：US4893688A

公开(公告)日：1990-01-16

申请号：US245438

申请日：1988-09-23

Applicant: Mitsuharu Morishita

Inventor： Mitsuharu Morishita

IPC: B62D6/02 ,  B62D5/04 ,  B62D6/00 ,  B62D7/14 ,  B62D101/00 ,  B62D113/00 ,  B62D117/00 ,  B62D119/00 ,  B62D137/00

CPC classification number: B62D7/148 ,  B62D5/0436 ,  B62D5/0478 ,  B60G2202/135 ,  B60G2202/42 ,  Y10S477/906 ,  Y10T477/327

Abstract: An electric rear wheel steering apparatus provided with an electromagnetic clutch 12 between a motor 11 for driving rear wheels 9 and a worm reduction gear 12 having a reversion efficiency of zero or lower, and a control unit 20 adapted to cut off an electric current flowing to the motor 11 and disengage the electromagnetic clutch 12 when an abnormal operation other than predetermined operation is ascertained. When an abnormal operation is detected, the rear wheel steering gear is fixed in the actual position by a control operation of the control unit 20, so that the rear wheels are prevented from becoming uncontrollable.

公开(公告)号：US4856606A

公开(公告)日：1989-08-15

申请号：US203682

申请日：1988-06-07

Applicant: Louis R. Brown

Inventor： Louis R. Brown

IPC: B62D7/14

CPC classification number: B62D7/148

Abstract: In a vehicle having steerable front wheels and steerable rear wheels, a movable member is connected with the rear wheels to steer the rear wheels upon movement of the member. A motor moves the member in response to steering the front wheels. Movement of the member is blocked in response to failure of the motor. A switch is provided for selecting between front wheel only steering and combined front and rear wheel steering. When combined front and rear wheel steering is selected, movement of the member is permitted.

公开(公告)号：US4603873A

公开(公告)日：1986-08-05

申请号：US767698

申请日：1985-08-21

Applicant: Roberto Perlini

Inventor： Roberto Perlini

IPC: B62D9/00 ,  B62D5/06 ,  B62D7/14 ,  B62D13/00

CPC classification number: B62D7/148 ,  B62D13/00

Abstract: A device for straight traveling stabilization and change of attitude on predetermined paths for vehicle axles, comprising a permanent elastic energy loading unit which exerts on the axle stabilizing forces of a greater intensity than the external forces acting thereon, a shifting actuator which, when operated, exerts on the axle forces of greater intensity than that of the stabilizing forces and thus causes it to be steered, and a shifting actuator control member which is actuated when there are variations in the traveling attitude of the main steering system of the vehicle. The device permits the axle to which it is applied to be kept in the normal condition of a fixed axle and permits it to render steering only when the main steering system of the vehicle is subjected to steering.

Abstract translation: 一种用于车辆轴线的预定路径上的直行稳定和姿态改变的装置，包括：永久弹性能量装载单元，其施加在比作用于其上的外力更大的强度的轴上的稳定力;移动致动器，当操作时， 施加在比所述稳定力更强的车轴上，从而使其转向;以及移动致动器控制构件，其在所述车辆的主转向系统的行驶姿态发生变化时被致动。 该装置允许其所施加的轴保持在固定轴的正常状态，并允许其仅在车辆的主转向系统受到转向时才进行转向。