Jtekt Corporation

Toyota Jidosha Kabushiki Kaisha

Jtkekt Corporation

Koji Anraku

Isao Namikawa

Yoshio Kudo

Yusuke Kakimoto

Takashi Kodera

Kenji Shibata

Kosuke Akatsuka

Hidenori Itamoto

Naoki Yamano

Yoshihiro Yamashita

Takuji Yoshida

Masaharu Yamashita

Tomoyuki Iida

Satoshi Matsuda

Masahide Nitano

Yuji Fujita

Toru Takashima

Yosuke Yamashita

Shintaro Takayama

Kenichi Abe

Tetsuya Morino

Kenji Yoshida

Takafumi Sato

Takahito Ishino

Junya Miyake

Yoshiyuki Uchino

Amane Yajima

Yuusuke Kakimoto

A steering control device is configured to control a steering device that changes a transmission ratio between an operation angle of an operation member and a steering angle of a steerable wheel. The steering control device includes: communication lines for transmitting vehicle speed information; and calculators communicably connected to each other and individually connected to the communication lines. Each calculator calculates the transmission ratio based on the vehicle speed information received via a corresponding one of the communication lines and determines whether the received vehicle speed information is valid. When at least one of the calculators determines that the vehicle speed information is not valid, each calculator changes control for calculating the transmission ratio from a vehicle-speed responsive control in which the transmission ratio is calculated based on the vehicle speed information to a specific control in which the transmission ratio is calculated not based on the vehicle speed information.

Steering control device

In a reaction torque calculation process, an electronic control unit included in a steer-by-wire steering device is configured to calculate a distributed axial force obtained by distributing an angle axial force and an electric current axial force based on a final distribution ratio. The reaction torque calculation process includes at least one of a first abnormal-time process and a second abnormal-time process. The first abnormal-time process is executed to hold, for calculation of the angle axial force, a vehicle speed signal value immediately before the vehicle speed signal becomes abnormal. The second abnormal-time process is executed to hold, for calculation of a normal-time distribution ratio, a vehicle speed signal value immediately before the vehicle speed signal becomes abnormal or hold a value of the normal-time distribution ratio immediately before the vehicle speed signal becomes abnormal, and then gradually change the final distribution ratio to an abnormal-time distribution ratio.

Steering device and steering method

A steering control device includes a processor configured to execute a reaction force control process. The reaction force control process includes a reaction force torque calculation process of calculating a reaction force torque operation amount. The reaction force torque calculation process includes a deviation compensation calculation process of calculating a deviation-compensating component. The deviation compensation calculation process includes a process of calculating a positional deviation, a process of calculating the deviation-compensating component based on the positional deviation, and a process of switching among a plurality of calculation states for calculating the deviation-compensating component. The process of switching among the calculation states is a process of permitting switching among the calculation states on the condition that a permission condition is met. The permission condition is met based on an operation amount that varies in association with a driver's operation of an operation member.

Steering control device and steering control method

A steering control device includes a base axial force calculator, a limiting axial force calculator, and a final axial force calculator. The limiting axial force calculator includes a steering angle holder, a reference angle calculator, a final difference calculator, and an axial force calculator. The steering angle holder is configured to hold a steering angle at the time of limiting a turning operation of the turning wheels when the turning operation is limited. The reference angle calculator is configured to calculate a reference angle. The final difference calculator is configured to calculate a final difference which is a final difference between the reference angle and the current steering angle. The axial force calculator is configured to calculate a limiting axial force based on a value of the final difference.

A steer-by-wire steering system for a vehicle, comprising: an operation member operable by a vehicle driver; an urging device configured to generate an urging force to urge the operation member; a steering device configured to steer a wheel; and a controller configured to control the urging device and the steering device. In a normal operation, the controller enables the wheel to be steered in accordance with an operation of the operation member and causes the urging force to function as an operation reaction force against the operation of the operation member. In an automatic steering operation in which the wheel is steered without depending on the operation of the operation member, the controller enables the operation member to be moved in accordance with steering of the wheel by the urging force and causes at least part of the urging force generated in the normal operation not to be generated.

Steer-by wire steering system

A vehicle control system controls a steer-by-wire type vehicle. The vehicle control system executes: reaction force control that applies a steering reaction force to a steering wheel; and driving assist control that assists driving of the vehicle. The reaction force control includes road information transmission control that applies a steering reaction force component corresponding to an oscillation caused by road surface unevenness to the steering wheel. The vehicle control system deactivates the road information transmission control when a deactivation condition is satisfied. The deactivation condition is that the driving assist control is in operation and a steering parameter reflecting a driver's steering intention is less than a threshold. As another example, the deactivation condition is that the driving assist control that vibrates the steering wheel for notifying the driver of a possibility of a lane departure is in operation.

Vehicle control system and vehicle control method for a vehicle of a steer-by-wire type

A vehicle control system controls a vehicle of a steer-by-wire type. The vehicle control system is configured to execute: driving assist control that assists driving of the vehicle; and conjunction reaction force control that applies a steering reaction force component to a steering wheel in conjunction with turning of the vehicle caused by the driving assist control. A driving assist direction is a direction of the turning of the vehicle caused by the driving assist control. The conjunction reaction force control includes feedforward reaction force control that moves the steering wheel in a same direction as the driving assist direction without depending on a steering angle of the steering wheel.

Vehicle control system and vehicle control method

An abnormality detection device includes a processing circuit configured to perform an abnormality detecting process. The abnormality detecting process includes a first state quantity acquiring process, a second state quantity acquiring process, a difference calculating process of calculating a difference between a first state quantity and a second state quantity, and a determination process of comparing an absolute value of the difference with a difference threshold value. The abnormality detecting process is a process of detecting an abnormality of a turning unit when the absolute value of the difference is greater than the difference threshold value, and the processing circuit is configured not to perform the determination process when an absolute value of an actual current value is greater than a current threshold value.

Abnormality detection device

A steering control apparatus is configured to control a steering system having a structure in which a power transmission path between a steering mechanism and a steering operation mechanism including a motor configured to generate a motor torque is separated. The steering control apparatus includes a controller configured to control driving of the motor. The controller detects an abnormality of the steering operation mechanism when a value indicating a variation in the motor torque is a value indicating a state in which a steering operation shaft is presumed to be immovable though the motor torque is applied.

Steering control apparatus

A steering device includes: a mechanism configured to turn turning wheels of a vehicle; a motor configured to generate drive force that is applied to the mechanism; and a controller configured to control the motor in accordance with a steering state. The controller includes a determination circuit configured to determine whether or not one of the turning wheels is in contact with an obstacle based on at least a value of electric current that is supplied to the motor and a vehicle speed. The controller is configured to, when one of the turning wheels is in contact with the obstacle, notify a driver that one of the turning wheels is in contact with the obstacle.

Steering device

A steering control device includes control circuitry configured to perform synchronization control. The synchronization control includes a target synchronization angle calculating process of calculating a target synchronization angle that is a steering-side rotation angle satisfying a predetermined correspondence relationship with respect to a turning-side rotation angle; a target relay angle calculating process of calculating a target relay angle that is located closer to a first side in a circumferential direction than a first-side angle is, the first-side angle being one of the steering-side rotation angle and the target synchronization angle and being located closer to the first side than another of the steering-side rotation angle and the target synchronization angle is; and a motor driving process of operating a steering-side motor such that the steering-side rotation angle reaches the target synchronization angle after operating the steering-side motor such that the steering-side rotation angle reaches the target relay angle.

A steering system to steer wheels by a movement of a steering shaft, including: the steering shaft; an electric motor; a converter configured to convert a rotational motion of the motor into the movement of the steering shaft; a motor rotation angle obtainer configured to obtain a motor rotation angle from a zero point position; a movement-amount-related-amount obtainer configured to obtain a movement-amount-related amount that is a movement amount of the steering shaft from a neutral position or a physical amount in a one-to-one correspondence with the movement amount; and a controller including a malfunction detector configured to detect a presence or absence of a malfunction of the converter in a mode that differs depending on a temperature state of the steering system, based on the motor rotation angle from the zero point position obtained by the motor rotation angle obtainer and the movement-amount-related amount obtained by the movement-amount-related-amount obtainer.

Steering system

In a controller for a steering device, the steering device includes a structure where motive power transmission between a steering unit and a turning unit is separated. The controller includes a control circuit configured to control operation of a steering-side motor that is provided in the steering unit to give steering reaction force that is force against the steering input into the steering unit. In a case where turning of the turning wheels to one direction is restricted, the control circuit is configured to calculate restriction reaction force for restricting steering that is to turn the turning wheels to the one direction. The control circuit is configured to calculate the restriction reaction force based on information on the steering unit.

Controller for steering device

A steering system includes a mechanism configured to turn a steer wheel of a vehicle, a motor configured to generate driving force that is applied to the mechanism, and a controller configured to control the motor according to a steering status. The controller includes a limiting control circuit configured to limit a current that is supplied to the motor to a limiting value, a determining circuit configured to determine whether the steer wheel is in contact with an obstacle by using at least a comparison between a value of the current that is supplied to the motor and a threshold, and a threshold computing circuit configured to compute the threshold that is used by the determining circuit, the threshold computing circuit being configured to compute a value less than the limiting value according to the limiting value as the threshold.

A steering apparatus includes: a mechanism that turns a turning wheel; a first motor that generates a driving force that is given to the mechanism; and a control device. The control device includes: a first computation circuit that computes a first limiting value to which an electric current to be supplied to the first motor is limited in a particular situation; a determination circuit that determines whether the turning wheel is in touch with an obstacle; a second computation circuit that computes a second limiting value to which the electric current to be supplied to the first motor is limited when the determination circuit determines that the turning wheel is in touch with the obstacle; and a third computation circuit that computes the threshold to be used by the determination circuit, based on a smaller limiting value of the first limiting value and the second limiting value.

Growing community of inventors

Okazaki, Japan

Koji Anraku