Valeo Systemes D'essuyage

Frédéric Floquet

Jose-Luis Herrada

Dominique Caillaud

Pierre Pilard

The present invention relates to a gear motor (), in particular for a wiper system, comprising: -a brushless DC electric motor () including: -a rotor; -a stator having coils for electromagnetically exciting the rotor; -a device for determining the angular position of the rotor; -a control unit configured to generate control signals for supplying power to the electromagnetic excitation coils of the stator; -a reduction mechanism () that is linked on one side to the rotor of the electric motor () and on the other side to an output shaft (), the reduction mechanism () having a predefined reduction ratio and; -an output angular position sensor () that is configured to measure the angular position of the output shaft (), wherein the output angular position sensor () that is configured to transmit a signal corresponding to the measured angular position of the output shaft () to the device for determining the angular position of the rotor and said device is configured to determine the position of the rotor on the basis of the transmitted signal by taking into account the predefined reduction ratio of the reduction mechanism (). The invention also relates to a wiper system and to a method for controlling the electric motor ().

Gear motor, associated wiper system and associated control method

Method of controlling a motor vehicle windscreen wiper motor, powered and controlled by pulse width modulation (PWM) with duty ratio (T) of determined value, in which the instantaneous fundamental period of the modulated pulses is switched successively between at least two discrete period values (T, T), the duty ratio (T) of the pulses (PWM) being substantially established at a determined value for at least one determined duration (Tc) of switching of the modulated pulses. Application to the reduction of the EMC noise level in the radio frequency bands to be protected.

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Coussay les Bois, France

Frédéric Floquet