US 2006/0190151 A1 · Steering control device

Abstract

A steering control device in which a steering portion including an electric steering reaction force actuator and a steered portion including an electric steered portion actuator are mechanically disconnectable and connectable via backup means. A steer-by-wire control means is provided for disconnecting the backup means and performing steer-by-wire control using control of the steered portion actuator to set a steered angle corresponding to the steering condition and using control of the steering reaction force actuator to add a steering reaction force corresponding to the steered condition. A steering assistance control means is also provided for connecting the backup means and performing steering assistance control by adding a steering aid force using at least one of the steering reaction force actuator and the steered portion actuator. The power supply capacity of a steered vehicle is selectively estimated and if the estimated power supply capacity reaches a predetermined value or below during the steer-by-wire control, steering is switched to the steering assistance control.

Claims13

Dependent claims

A steer-by wire control system comprising:

a steering portion that is operated by a driver;
steered wheels that are mechanically disconnected from the steering portion;
a steered portion actuator to operate the steered wheels;
a steering reaction force actuator to apply a steering reaction force to the steering portion;
a backup apparatus that can connect mechanically the steering portion and the steered wheels;
a power voltage supplier to supply electrical power to the steered portion actuator;
and
a controller that is applied to control the steered portion actuator, the steering reaction force actuator, and the backup apparatus;
wherein
the controller is configured to control the steered portion actuator to set a steered angle corresponding to the steering condition of the steering portion,
the controller is configured to control the steering reaction force actuator to add a steering reaction force corresponding to the steered condition,
the controller is configured to estimate the power supply capacity of the power voltage supplier, and
the is controller configured to connect mechanically the steering portion and the steered wheels by the backup apparatus when the power supply capacity is reduced to a set value or lower during the steer-by wire control.

10 more elements

Dependencies are inferred from the claim text.

Steering control device

Life of this patent

Steering control device

Life of this patent

Abstract

Claims13