Thyssenkrupp Presta Ag

Honda Motor Co., Ltd.

Thyssen Krupp Ag

Péter Kakas

Imre Szepessy

Munetsugu Hanji

Yosuke Ojima

Hayato Miyakawa

Yoshinobu Watanabe

Miklós Arányi

Takashi Kuribayashi

Takaya Yamaguchi

Levente Pásztor

Daniel Vizer

Laszlo Dombai

Krisztián Dömötör

Satoshi Nakahara

Adela Beres

Adám Varga

Àdám Varga

Adam Szabo

Daniel György

Zoltán Szander

David Kulcsar

Botond Hamori

Zoltan Gaal

ÁKos Mester

Mark Muller

Yoschinobu Watanabe

A steer-by-wire steering system for a road vehicle includes a road wheel actuator to act on steerable wheels and electronically controlled as a function of a driver's steering request, a feedback actuator to transmit reactions of a road to a steering wheel, and a single steering wheel angle sensor to measure a steering wheel angle. The steering wheel angle sensor is an external sensor able to communicate on a second vehicle communication channel or via a private communication with the road wheel actuator. The steer-by-wire steering system also includes an external road wheel actuator position sensor to measure a position of the road wheel actuator and to communicate on the second vehicle communication channel or via the private communication with the road wheel actuator.

Steer-by-wire steering system of a road vehicle with external steering wheel angle sensor

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

A method to control a steer-by-wire steering system of a road vehicle including a feedback actuator, a road wheel actuator, and a controller configured or programmed to control the feedback actuator and the road wheel actuator, and the method includes, upon external request to the controller, providing a garage mode of the steer-by-wire system, switching off the feedback actuator, depending on the external request, moving to a predetermined position or moving from a first end position to a second end position of the road wheel actuator or fixing a position of the road wheel actuator at a last position or a center position, and, after the garage mode is terminated, returning the road wheel actuator to an original position before the garage mode was entered into and switching on the feedback actuator.

Method for controlling a steer-by-wire steering system of a road vehicle with garage mode

A method of controlling a steering system for a vehicle includes determining a state of performance degradation of the steering system, determining a vehicle situation, determining if a performance of the steering system in the determined state of performance degradation is sufficient for the determined vehicle situation, and, if the performance of the steering system is not sufficient, modifying the state of performance degradation by decreasing a degradation level for a period of time.

Power boost during degradation of a steering system

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 steer-by-wire steering system for a motor vehicle may include a rotatably supported steering spindle, a feedback actuator with a feedback motor for acting on the steering spindle, a steering actuator with a steering motor for acting on steered wheels of the motor vehicle based on rotation of the steering spindle, and two control units for controlling the feedback motor and the steering motor. A first control unit of the two control units and a second control unit of the two control units have different levels of complexity relative to each other, in particular such that the first control unit is more powerful than the second control unit. Also, a method can be utilized to operate such a steer-by-wire steering system, whereby the first control unit and the second control unit execute procedures of different complexity relative to each other.

Steer-by-wire steering system for a motor vehicle

In a steer-by-wire steering system for a vehicle, a control unit () controls an operation of a steering actuator to cause the steered angle of wheels to be in a prescribed relationship to a steering angle, and an operation of the reaction force actuator () including a pair of reaction force motors () to cause the reaction force to be a value (Tt) corresponding to a steered state of the wheels, wherein the control unit is provided with a failure detection unit () configured to detect failures of the reaction force motors, and upon detecting a failure of one of the reaction force motors, progressively reduce an output (Tta) of the other reaction motor to a prescribed limit value (TL).

Steering system for vehicle

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

A method for controlling a steer-by-wire steering system for a motor vehicle may involve determining a torque request signal with a position controller of an activation unit based at least on a desired steering angle and an actual steering angle, limiting the torque request signal in a signal limiting device of the activation unit such that the torque requested by the limited torque request signal is limited to a permissible torque range, and transmitting the limited torque request signal to an electronically controllable steering actuator. The signal limiting device may determine a reference torque signal by way of a reference controller based at least on the desired steering angle and the actual steering angle. The signal limiting device may define the permissible torque range by way of a selectable maximum deviation from the reference torque signal.

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

A steer-by-wire steering system for motor vehicles includes an electronically controlled steering actuator acting on steered wheels of the vehicle responsive to a steering demand and a feedback actuator transmitting retroactive effects of the road to a steering wheel, wherein the feedback actuator and the steering actuator have a redundant power supply.

Steer-by-wire architectures

A method for controlling a steer-by-wire steering system for motor vehicles includes a steering actuator that acts on the steered wheels and is electronically controlled in accordance with a steering request. A feedback actuator transmits reactions of the road to a steering wheel. A control unit controls the feedback actuator. The method includes determining a basic motor torque; providing at least one steering function which is part of a first subgroup of steering functions; limiting the output value of the at least one steering function to reach a predefined safety level in a first limiter; adapting the basic motor torque by means of the limited output value of the at least one steering function in a summing element; and actuating the feedback actuator with the resulting motor torque which is output by the summing element.

Method for controlling a steer-by-wire steering system comprising a limiter for reaching a safety level

An electromechanical motor vehicle power steering mechanism for assisting steering of a motor vehicle including an electric motor for steering assist and a torque sensor. The electric motor is configured to apply an assistance torque in response to an output signal from the torque sensor indicative of the input torque applied by a driver of the vehicle to a steering wheel, in which the relationship between the indicated input torque and the assistance torque applied by the motor is defined by a boost curve. A logical summer is used to restrict the relationship between the indicated input torque and the assistance torque within given safety limits.

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Budapest, Hungary

Péter Kakas