Hitachi Astemo Ltd.

Showa Corporation

Kyouichi Tagami

Eishi Ishimaru

Ken Isshiki

Katsutoshi Yokoi

Nobuyuki Enomoto

Tadayoshi Iwase

Katsutochi Yokoi

A steering control device which applies an assist torque or a reaction torque to a steering member operated by a driver, includes: a torque loss estimation unit which estimates torque loss; and a correction amount calculation unit which calculates a correction amount according to a rack axial force estimation value calculated based on a roll rate when the torque loss estimation unit estimates the torque loss.

Steering control device and steering device

Assist torque or reaction force torque with little unnatural feeling to a driver is applied. An ECU includes: a control amount calculation section that calculates a control amount for controlling magnitude of the assist torque or the reaction force torque with reference to steering torque applied to a steering member; and a control amount correction section that corrects the control amount calculated by the control amount calculation section with reference to a lateral G of a vehicle body, a steering angle of the steering member, and a steering angle speed of the steering member.

Control device for applying torque to a steering member

A road surface condition is determined appropriately. A road surface determining section () configured to determine a road surface state includes a threshold setting section () configured to set a threshold for determining the road surface state, so that a value of a desired control variable is multiplied by a coefficient determined in accordance with a result of the determination by the road surface determining section ().

Suspension control device and suspension device

A damping force of a suspension is controlled appropriately in accordance with a road surface condition. An ECU () includes: a road surface determining section () configured to determine a road surface condition; and a rolling attitude control section () configured to calculate a steering-based desired control variable, which is a candidate for a control variable for controlling a damping force of a suspension, in accordance with a result of the determination by the road surface determining section ().

A road surface condition is determined appropriately. A road surface determining section () configured to determine a road surface condition with reference to a wheel speed signal indicative of wheel speeds includes a band-stop filter () which acts on the wheel speed signal and has a cutoff frequency band which is changed in accordance with the wheel speed signal.

Road surface determination device, suspension control device, and suspension device

An embodiment of the present invention provides higher ride comfort to a driver in control of steering and suspension. An ECU () includes: a steering control section () which controls a magnitude of an assist torque or a reaction torque; and a suspension control section () which controls a damping force of a suspension. The steering control section () refers to a state of a vehicle which state is predicted by the suspension control section (), and the suspension control section () refers to a steering torque.

Vehicle control device, and vehicle

A motor-driven power steering apparatus including: a base current calculator configured to calculate a base current, which is a base for a target current, based on a detected torque detected by a torque sensor; a band-pass filter configured to allow a predetermined range of frequency components of the detected torque to the pass through the band-pass filter; a base shimmy compensation current calculator configured to calculate a base shimmy compensation current, considered a base for a shimmy compensation current required to suppress a disturbance torque, based on an extracted torque after passing through the band-pass filter; a shimmy compensation current calculator configured to calculate the shimmy compensation current by correcting the base shimmy compensation current according to magnitude of amplitude of the extracted torque; and a final target current determination unit configured to determine the target current based on the base current and the shimmy compensation current.

Growing community of inventors

Tochigi, Japan

Kyouichi Tagami