Nissan Motor Company Limited

Toshiaki Kasahara

Yuusuke Katou

Junji Tsutsumi

Kenichi Mori

Kazutaka Adachi

Hitoshi Ono

Takaaki Eguchi

Kazuo Hara

Kiyotaka Shitamitsu

A vehicle steering device and method for controlling steering of a steer-by-wire vehicle. A steering instrument receives input from a driver and a turning device turns the wheel(s). A selectively engageable backup clutch is positioned between the steering instrument and the turning device. Whether or not the backup clutch is engaged is based a steering state signal from the steering instrument and a turning state signal from the turning device.

Vehicle steering controller and method

In a vehicle steering device and control method, a selectively engageable clutch is positioned between a steering wheel and a turning mechanism for turning at least one wheel. The clutch has an engaged position where the steering wheel is mechanically connected to the turning mechanism and a disengaged position where the steering wheel is mechanically separated from the turning mechanism for steer-by-wire control. During steer-by-wire control, a reaction force actuator applies a force to the steering wheel, and a turning actuator applies a torque to the turning mechanism. To prevent erroneous clutch engagement caused by an increase in relative angular acceleration between the steering angle and the turning angle, a controller detects an operating condition corresponding to a risk of erroneous clutch engagement and controls at least one of the turning actuator and the reaction force actuator to reduce the relative angular acceleration.

Vehicle steering device and control method for vehicle steering device

A vehicle steering device and method for preventing steering wheel pull. A selectively engageable clutch is positioned between a steering wheel and a turning mechanism for turning at least one steered wheel. The clutch includes an engaging piece and has an engaged position where the steering wheel is mechanically connected to the turning mechanism and a disengaged position where the steering wheel is mechanically separated from the turning mechanism and steer-by-wire controls the at least one steered wheel. When the clutch is moved from the engaged position to the disengaged position, clutch release control is performed that provides a rotational angle of deviation between a steering wheel shaft connected to the steering wheel and the turning mechanism, the rotational angle of deviation provided in the direction of disengagement.

A vehicle steering device and control method for use in steer-by-wire steering systems. A steering instrument is operable to receive input from a driver and a turning device is operable to turn at least one wheel. A selectively engageable backup clutch is positioned between the steering instrument and the turning device. Engagement of the backup clutch results in a mechanical connection between the steering instrument and the turning device for assisting control of the at least one wheel, and release of the backup clutch results in a separation of the steering instrument and the turning device for steer-by-wire control of the at least one wheel. A controller is operable to switch from the steer-by-wire control to the assisting control when the backup clutch engages during operation of the steer-by-wire control.

A vehicle steering control apparatus includes a steering wheel to be operated by a driver, a steering mechanism for turning the front wheels in accordance with an operating torque of the steering wheel, and a clutch for mechanically connecting the steering wheel to the steering mechanism. A clutch engagement command issuing section is provided for issuing an engagement command to the clutch when the clutch is disengaged and a condition for engaging the clutch is satisfied. A clutch engagement determining section is provided for determining that the clutch is in an engaged state when an increase in torque is detected at the steering wheel after the engagement command has been issued to the clutch.

Vehicle steering control apparatus and method

A vehicle steering apparatus includes a steering reaction actuator that produces a steering reaction force to be applied to the manual steering unit, a steering reaction force controller that outputs a steering reaction force command value to the steering reaction force actuator, and a road surface input torque detector that detects a road surface input torque inputted to steerable road wheels from a road surface, wherein the steering reaction force controller includes a low cut-off frequency filter that extracts a low frequency component equal to or lower than a predetermined frequency from an output of the road surface input torque detector and sets the steering reaction force command value on the basis of a vehicle driving condition and an output of the low cut-off frequency filter. A vehicle steering method is also provided.

Vehicle steering apparatus and method

A steering apparatus for a steerable vehicle includes a steering actuator, a steering input unit, a disturbance determination section, and a steering controller. The steering actuator is configured to generate a steering effort to regulate a steering output of the vehicle, in accordance with a steering effort command. The steering input unit is configured to set a steering input. The disturbance determination section is configured to determine a disturbance indicator indicative of a disturbance input to the vehicle. The steering controller is configured to perform the following: setting a desired steering output in accordance with the steering input; setting the steering effort command in accordance with the desired steering output; adjusting the steering effort command in accordance with the disturbance indicator; and outputting the adjusted steering effort command to the steering actuator.

Steering apparatus for steerable vehicle

A fail-safe steering system for a vehicle, which prevents movable elements of a backup mechanism from being dragged by motions of an associated one of a steering input section and a steering output section under normal operating conditions of the system, is provided. The fail-safe steering system includes two selectively engageable clutch mechanisms operatively connectable between the steering input section and the backup mechanism and between the backup mechanism and the steering output section. The fail-safe steering system also includes a mechanism for keeping the backup mechanism in the neutral condition during backup mechanism being mechanically separated under normal operating conditions of the system.

Fail-safe steering system for a vehicle

In steering apparatus and method for an automotive vehicle, a turning section that turns steered road wheels is provided, a clutch is installed in a predetermined position in a midway through a steering system from an operation input section to the steered road wheels to link between the operation input section and the steered road wheels, a steering angle of the operation portion is detected, a turning angle is detected, an elastically deformable member is interposed between the operation portion and the turning portion to transmit a steering torque inputted from the operation input section to the steered road wheels when the clutch causes the operation input portion and the steered road wheels to be connected; and an angular deviation between the steering angle detection value and the turning angle detection value developed due to a deformation of the member is calculated.

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Kanagawa, Japan

Toshiaki Kasahara