Jtekt Europe

Jtekt Corporation

Jtekt Europe S.a.s.

Pierre Larminy

Pascal Moulaire

André Michelis

Terutaka Tamaizumi

Tahar Slama

Christophe Ravier

Nicolas Baudouin

Arnaud Bouchet

A method for determining a setpoint torque for a steering wheel of an electric power steering system of a vehicle, the setpoint torque helping determine an engine torque applied directly or indirectly to the steering wheel, the setpoint torque being a function of at least one equivalent lateral acceleration having a dimension of an acceleration, wherein the equivalent lateral acceleration is weighted by a gain dependent on at least a steering wheel torque.

Method for determining a setpoint torque for a steering wheel as a function of a gain dependent on a steering wheel torque

A method for fine-tuning a variable-gear steering column according to a speed of the vehicle, the method includes: a step of characterizing a desired handling of the vehicle for a speed Vand of characterizing a desired stability for a speed V; a step of determining a value Gof the gear ratio allowing obtaining the desired handling at the speed V, and a value Gof the gear ratio allowing obtaining the desired stability at the speed V, a step of calculating a parameter pand a parameter paccording to the speed V, the speed V, the value Gand the value Gso that the relationship between the gear ratio and the speed of the vehicle is defined by the equation G=p+p/V, when the speed is included between a first threshold and a second threshold.

Method for fine-tuning a variable-gear steering column, and vehicle comprising a variable-gear power steering system

A method for piloting a motor of a power steering system of a vehicle, the power steering system having at least one steering wheel and one rack, the motor being piloted by a closed-loop proportional-derivative regulator (R) receiving as input an angular position (θ) of the motor and a setpoint angle (θ), the regulator (R) determining a setpoint motor torque (C). The method

Method for piloting a motor by a proportional-derivative regulator taking into account the stiffness of a power steering system

Method for determining a friction to be adjusted in a power steering system or for modifying a hysteresis of a steering wheel torque applied to a steering wheel of the power steering system, the method including the following steps of: determining a speed, from a measurement of a speed of a part of the power steering system and/or a measurement of the steering wheel torque; determining the friction to be adjusted on the basis of a modified LuGre model, said modified LuGre model determining the friction to be adjusted as a function of a state of the system, a time derivative of the state being determined as a function of said state of the system, the speed, a first gain, and a coulomb friction, according to an equation of the form:

Method for estimating and adjusting friction to be adjusted, and controlling hysteresis of a steering wheel torque, and corresponding power steering system

A method for determining a friction torque exerted within a steering column of an electric power steering system, the power steering system comprising a steering column provided with a torsion bar undergoing an instantaneous torsion torque, the steering column being linked to a pinion capable of driving a rack, a torsion bar sensor intended to measure the instantaneous torsion torque, the method comprising an acquisition step, during which at least one value of the friction torque is measured by the torsion bar sensor, the acquisition step being carried out following the reception of a trigger signal, the value of the trigger signal depending on values of conditional variables (VL, A, V, C, &#x394;C, &#x394;A).

Method for determining friction torque

A method for determining a setpoint torque for a steering wheel of a power-assisted steering system of a vehicle, the setpoint torque making it possible to determine a motor torque applied directly or indirectly by a control motor to the steering wheel, and the setpoint torque being at least determined by a reversibility function designed to bring a steering wheel angle of the steering wheel toward the steering wheel angle at which the vehicle will follow a trajectory in a straight line, the reversibility function comprising a first step in which a target speed of the steering wheel is determined depending on the steering wheel angle, wherein the target speed is also a function of a yaw rate of the vehicle.

Method for determining a setpoint torque on the basis of a reversibility function calculating a target speed of a steering wheel depending on a steering wheel angle and a yaw rate

A steering controller includes processing circuitry configured to execute a first operation process that, when an angle command value is not input from outside of the processing circuitry, calculates a first torque command value corresponding to a steering-side operation amount and operating a drive circuit of an electric motor to adjust torque of the electric motor to the first torque command value. The processing circuitry is further configured to execute a second operation process that, when the angle command value is input from the outside of the processing circuitry, calculates a second torque command value corresponding to at least an angle-side operation amount of the steering-side operation amount and the angle-side operation amount and operating the drive circuit of the electric motor to adjust the torque of the electric motor to the second torque command value.

Steering controller and steering control method

A steering controller includes processing circuitry. The processing circuitry is configured to execute an operation process for calculating a torque command value corresponding to a sum of an amount by which the steering-side operation amount is converted into the torque required for the electric motor and an amount by which the steerable wheel-side operation amount is converted into the torque required for the electric motor and operate a drive circuit of the electric motor to adjust the torque of the electric motor to the torque command value.

A steering controller includes processing circuitry configured to execute a torque control process that calculates a steering-side operation amount, an angle feedback control process that calculates an angle-side operation amount, and an operation process that operates a drive circuit of an electric motor to adjust torque of the electric motor to a torque command value. The processing circuitry is further configured to execute a switch process that switches, when determining that a controllability of the electric motor is less than or equal to a predetermined efficiency, the torque command value from a value based on the angle-side operation amount to a value based on the steering-side operation amount instead of the angle-side operation amount.

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Oullins, France

Pierre Larminy