System for controlling the speed of an electric fan
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United States of America Patent
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May 19, 2015
Grant Date -
Jun 21, 2012
app pub date -
Dec 13, 2011
filing date -
Dec 16, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
The system has a driving circuit for the motor of the electric fan, coupled to the electrical system of a motor vehicle and having a plurality of controlled electronic switches, and an electronic control unit arranged to control the driving circuit in such a way as to cause the flow in the motor of a variable average current capable of producing a required speed of rotation, in accordance with a predetermined relationship or function. The control unit is designed to store a predetermined threshold of rotation speed, and to control the motor through the associated driving circuit in such a way that when the rotational speed of the motor exceeds the threshold the driving circuit causes electrical braking of the motor.
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