Jtekt Europe

Julien Barthomeuf

Stephane Cassar

Andre Michelis

Pascal Moulaire

André Michelis

Pierre Pilaz

Pierre-Willem Pilaz

Stéphane Bourbon

Stéphane Cassar

A method for managing a power-steering motor configured to supply a force to assist the movement of a steering rack involves the steering rack being mounted such as to be movable between at least a first position and a second position in order to be able to change the steering angle of a steered wheel. The method includes the steps of defining a virtual end-of-travel threshold strictly between the first position and the second position. If the rack is detected as having crossed the virtual end-of-travel threshold in a predetermined crossing direction, simulating, by the power-steering motor, an end-of-travel stop by including in the assistance instruction a resistance instruction that simulates the effect of a mechanical stop, such as a spring-damper or a mass-spring-damper, preventing the actuator member from progressing further beyond the virtual end-of-travel threshold.

Use of a power-steering motor to simulate an end-of-travel stop for said steering

The invention relates to a method for calculating the understeering ratio of automobiles provided with electric power steering (EPS) including an electric assistance motor () driven by an onboard electronic computer (), a sensor () providing a first piece of information on a real angular position of the steering wheel (), a wheel anti-lock braking system (ABS) providing a second piece of information on the speed of the wheels () of the vehicle, characterised in that the onboard computer () of the EPS processes the second piece of information for estimating a theoretical angular position of the steering wheel (), which is further compared to the real angular position of the steering wheel () in order to derive the understeering ratio (&#x3c4;) of the vehicle.

Method for determining the understeering ratio of a vehicle provided with electric power steering and for optionally correcting the power steering

A method for determining the absolute angular position of a steering wheel of an electric power-assisted steering column of a motor vehicle, including a means for measuring a dynamic parameter while the vehicle is running and including among others, the steps of periodically determining a multi-turn relative angular position, determining at least one dynamic parameter relating to the running conditions of the vehicle using the means for measuring said parameter, determining an absolute steering-wheel angle calculated according to at least one dynamic parameter, and weighting the calculated value of the absolute steering-wheel angle according to a test of the validity of the calculated value of the absolute steering-wheel angle and the origin of said value, in other words, the measurement means used to determine said at least one dynamic parameter.

Device for determining the absolute angular position of the steering wheel of an electric power-assisted steering column of a motor vehicle using weighted dynamic parameters of the vehicle

The invention concerns a method which includes: filtering the torque signal using a low-pass filter of the first order at a variable cut-off frequency which takes on, respectively, a minimum value or a maximum value depending on whether the amplitude of the torque signal is, respectively, lower or higher than a predetermined threshold; then in producing a signal indicating, respectively, a steering wheel release or a steering wheel grip depending on whether the amplitude of the filtered torque signal is, respectively, lower or higher than a predetermined threshold.

Method for determining, in real time, the grip on a steering wheel of an electric power-assisted steering system for automobile

The method consists in: determining in which actually sector the booster motor is located, a sector of the booster motor being defied by two successive poles; determining a relative angle position of the steering wheel in relation to the booster motor; identifying a sector, known as neutral, in which the booster motor is located when the rotation speeds of the rear wheels, i.e. right and left of the vehicle, are equal; determining an angle offset of the steering wheel corresponding to a neutral angle position of the steering wheel; determining an absolute angle position of the steering wheel which is equal to the difference between the relative angle position of the steering wheel and the offset angle thereof.

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Saint Genis Laval, France

Julien Barthomeuf