Honda Motor Co., Ltd.

Thyssenkrupp Presta Ag

Yoshinobu Watanabe

Munetsugu Hanji

Péter Kakas

Hayato Miyakawa

Levente Pásztor

Yosuke Ojima

Imre Szepessy

Krisztián Dömötör

Miklós Arányi

Adam Szabo

Kristof Polmans

Imre Benyo

Takaya Yamaguchi

Adela Beres

Laszlo Dombai

Daniel György

Zoltán Szander

Levente PÁSZTOR

Provided is a steer-by-wire steering system for a vehicle that can reduce or eliminate the impact noise generated by the rack at the rack end. A control unit of the steering system is configured to determine a target steered angle (αt) according to the steering angle and drive the steering actuator so as to cause the steered angle to coincide with the target steered angle, and to determine a target reaction force (Tt) according to a steered state of the wheels and drive the reaction force actuator so as to cause the reaction force to coincide with the target reaction force. The control unit is further configured to set a maximum limit (αmC) on the target steered angle, the maximum limit being a value smaller than a physical maximum steered angle (αmP) of the wheels imposed by the steering mechanism.

Steering system for vehicle

A method for power saving in a steering system of a motor vehicle including a road wheel actuator acting on a rack to turn steerable road wheels and a controller configured or programmed to generate an operation signal for the road wheel actuator, wherein the controller includes a position controller to generate a motor torque request based on an actual and/or a measured position of the rack and a requested rack position, includes detecting a passive mode of the steering system by a passive mode detector of the controller if the motor vehicle is stopped and no steering input is provided, and if a passive mode is detected by the passive mode detector, setting the motor torque request to zero in order to save power.

Power saving mode for steering systems of a motor vehicle

A method to control a steer-by-wire steering system of a road vehicle including a road wheel actuator to turn steerable road wheels and a steering wheel actuator to apply a feedback torque to a steering wheel, includes calculating the feedback torque by modifying a base steering torque as a function of a longitudinal and/or lateral acceleration measured by sensors of the vehicle, and sending the calculated feedback torque to the steering wheel actuator to provide feedback to the driver at the steering wheel.

Steer-by-wire steering system with acceleration dependent steering torque feedback

To prevent a driver from feeling uncomfortable when the driver touches a steering member in a state where a driving source is stopped, a vehicle steering system () is provided in a vehicle () that travels by a driving force generated by a driving source (). The vehicle steering system () includes; a steering member () configured to accept a steering operation; and a reaction force actuator () configured to apply a reaction force to the steering member () in response to the steering operation. In a state where the driving source () is stopped, the reaction force actuator () is configured to apply the reaction force to the steering member () based on a stopped time position that is a position of the steering member () at a time when the driving source () is stopped.

Vehicle steering system

The vehicle steering control system includes a control unit configured to control the steering actuator to achieve the steered angle based on at least one of the steering angle and the steering torque. The control unit executes an output restriction control to restrict an output of the steering actuator when a steering torque is equal to or greater than a prescribed threshold value, and cancels the output restriction control when the detection unit has detected a prescribed mode of operation by the operator while the output restriction control is being executed.

A method to control a steer-by-wire steering system of a road vehicle including a steering wheel coupled to a steering shaft, a road wheel actuator to turn steerable road wheels, a shaft sensor to detect a rotation of the steering shaft and a controller configured or programmed to generate an operation signal for the road wheel actuator from a signal detected by the shaft sensor, includes determining a real steering wheel angle by the shaft sensor, modifying the real steering wheel angle by applying an artificial hysteresis to create an offset between the real steering wheel angle and a modified steering wheel angle to mimic a behavior of an electromechanical power steering mechanism, and generating the motor torque request for the road wheel actuator based on the modified steering wheel angle.

Steer-by-wire steering system with artificial position hysteresis for steering wheel angle modification

A method to control a steer-by-wire steering system for a road vehicle including a steering device, a road wheel actuator to actuate road wheels, and a controller configured or programmed to generate a motor torque request for the road wheel actuator based on an actual or an estimated position and a position request, which is based on the position of the steering device, includes detecting a road wheel actuator power limit situation, modifying the position request so that it can be followed by the road wheel actuator within power limits, and using the modified position request to generate the motor torque request for the road wheel actuator.

Steer-by-wire steering system with road wheel actuator power limit handling

Provided is a steer-by-wire steering system () for a vehicle () that can appropriately bring the steered angle of the wheels to a prescribed relationship to the steering angle of a steering member () even when the steering angle of the steering member was changed while the vehicle was parked. When the steered angle of the wheels deviates from the prescribed relationship with the steering angle of the steering member upon startup (ST: Yes), the control unit () drives at least one of the steering actuator () and the reaction force actuator () to bring the steered angle (α) of the wheels closer to the prescribed relationship with the steering angle (β) of the steering member (ST) using a change in the transmission shift position from the park position (P) or the neutral position (N) to the travel position (D or R) as a trigger (ST: Yes).

A steer-by-wire steering system including a feedback actuator to simulate a steering feel to a steering device and including an electric motor connected to a steering shaft to transmit a torque, and a steering lock including a latch connected to the steering shaft in a torsion-resistant manner and a lock to engage with the latch at locking positions to block a rotation of the steering shaft. If an ignition is switched-off and a movement of the steering device is detected, a position of the steering shaft and a distance between the lock and a next locking position of the latch is determined. If the distance is greater than a predefined value, a counter-torque is transmitted to the steering shaft by the feedback-actuator opposite to the movement of the steering device until the locking position reaches the lock and the lock can engage with the latch.

Method for controlling steering locking of a steer-by-wire steering system of a motor vehicle

A vehicle front structure is mounted on a vehicle, and includes a steering gearbox that includes a steering rack with rack teeth being formed thereon, and a pinion that meshes with the rack teeth. A shaft of the pinion protrudes rearward and downward of the vehicle. Thus, the vehicle front structure can reduce damage by the steering gearbox to the vehicle interior in case of a frontal collision of the vehicle.

Growing community of inventors

Tokyo, Japan

Yoshinobu Watanabe