Hitachi Astemo Ltd.

Hiroki Sonoda

Tomoaki Fujibayashi

Go Sakayori

Yoshiji Hasegawa

Kenta Maeda

Kazuya Takahashi

Toshihiko Kaneda

A steering device according to the present invention includes: a steering input device including a reaction force actuator that applies a steering reaction force to a steering operation input member; and a control device including a steering gear ratio change unit that changes a steering gear ratio in accordance with a vehicle speed, a reaction force actuator control unit that controls an output amount of the reaction force actuator in accordance with an operation angular velocity of the steering operation input member, and a reaction force actuator output amount change unit that changes, based on the steering gear ratio, the output amount of the reaction force actuator. This makes it possible to set an appropriate steering reaction force applied to the steering operation input member, thereby stably reducing the operational burden on a driver.

Steer-by-wire type steering device

An object of the present invention is to provide a steering control device and a steering control method that can reduce a driving burden imposed on a driver during low velocity driving. The present invention is provided with an arithmetic logic unit that changes a steering angle of a wheelby driving a wheel steering actuatorbased on a manipulated variable of a steering, and calculates a controlled variable of the wheel steering actuator. In turning the steering, the arithmetic logic unit controls the wheel steering actuatorbased on a first gain at which a ratio of an actual steering angle of the wheelchanges with respect to a steering angle δ, and in returning the steering, the arithmetic logic unit controls the wheel steering actuatorbased on a second gain that differs from the first gain.

Steering control device and steering control method

The present disclosure provides a steering control device capable of transmitting an appropriate reaction force by a driver via a steering wheel and improving the stability of a vehicle. Provided is a steering control devicefor controlling a reaction force actuatorthat generates a reaction force against an operation of a driver in a steering wheelof a vehicle. The steering control deviceincreases the reaction force in a nonlinear region where a cornering force characteristic that is the relationship between the slip angle and the lateral force of tiresof the vehiclebecomes nonlinear, more than the reaction force in a linear region where the cornering force characteristic becomes linear.

Steering control device

A steering control device, a steering control method, and a steering control system according to the present invention determines a rear wheel steering angle control command for returning a rear wheel steering angle to a predetermined steering angle earlier than a front wheel steering angle when steering wheel operation (that is, operation of a steering wheel) shifts from a state of additional turning to a state of cutback turning, in steering control that steers a rear wheel steering angle of a vehicle in opposite-phase with respect to a front wheel steering angle, and outputs the determined rear wheel steering angle control command to a rear wheel steering device, so that hysteresis of a yaw rate is reduced or eliminated, reducing or eliminating a sense of discomfort given to a driver.

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Hitachinaka, Japan

Hiroki Sonoda