System for controlling an electric motor of a fan associated with heat exchangers in a motor vehicle

Abstract

The system comprises a pressure sensor for providing a signal indicative of the pressure of the refrigerant fluid of the air-conditioning system at the output or delivery of the compressor of the system, a sensor for detecting the temperature of the liquid flowing through the engine-cooling system (R), an activation sensor for providing a signal when the air-conditioning system is activated, a sensor for detecting the speed of forward movement of the motor vehicle, and a control and operating unit connected to the sensors and to the electric motor and arranged for: determining a first speed for the electric motor in accordance with a function of the pressure of the refrigerant fluid of the air-conditioning system and of the speed of the vehicle, determining a second speed for the electric motor in accordance with a function of the temperature of the engine-coolant liquid and of the speed of forward movement of the vehicle, and sending to the electric motor control signals to bring its speed of rotation to a value equal to the greater of the first and second speeds.

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