FR3072523A1 - METHOD FOR STARTING A FRONT VENTILATION SYSTEM FOR A MOTOR VEHICLE - Google Patents

Abstract

The invention relates to a method of starting a front-end ventilation system for a motor vehicle, the front-end ventilation system comprising a motor-fan unit equipped with an engine electric motor comprising a step of starting said motor at a maximum speed of rotation.

Description

The invention relates to a method for starting a front panel ventilation system for a motor vehicle, the front panel ventilation system comprising a brushed electric motor.

In a known manner, the front face ventilation system comprises an air circulation fan, controlled by the brushed electric motor.

Such an electric motor mainly comprises a rotor and a stator.

Generally, the stator comprises a plurality of electromagnetic excitation coils of the rotor while the rotor comprises a multipolar magnet.

The electric motor is configured so that when the coils are supplied with electric current, a magnetic field is created, causing a rotational movement of the multipole magnet around an axis of rotation.

The brushes of the electric motor make it possible to ensure electronic switching of the power supply to the coils, the electric current being injected via the brushes to a rotary collector itself connected to the rotor.

However, during the life of the motor vehicle, dust accumulates in the front ventilation system, just as the water contained in humid air is deposited in the front ventilation system, and in particular in the electric motor, which then undergoes galvanic corrosion.

Due to galvanic corrosion, the brushes stick to the collector.

Then, the front ventilation system can no longer function, the electric motor being blocked, which can cause damage, sometimes irreversible, of the front ventilation system.

The object of the invention is to remedy these drawbacks.

To this end, the subject of the invention is a method for starting a front panel ventilation system for a motor vehicle, the front panel ventilation system comprising a brushed electric motor, the method comprising a start-up step. of said motor at a maximum speed of rotation of the electric motor.

Thus, thanks to the method according to the present invention, a high torque is applied to the motor, which ensures that the brushes, even previously glued to the collector, come off from the latter.

According to another characteristic of the invention, the method comprises a step of reducing the speed of the motor to a speed, called an intermediate speed, lower than said maximum speed of the fan motor unit provided with a brush motor.

According to another characteristic of the invention, the start-up step lasts between 0.1 seconds and one minute, preferably between 1 second to 2 seconds. According to another characteristic of the invention, the start-up step. lasts less than five seconds, and preferably two seconds.

According to another characteristic of the invention, the intermediate speed corresponds to an electric current between 10A and 12A.

The invention also relates to the use of the starting process as described above each time the motor vehicle is woken up or once a day.

The invention also relates to a front panel ventilation system for a motor vehicle, comprising an electric brushed motor, and an electronic control unit of the brushed motor according to the starting method as described above or according to the use as as previously described.

According to another characteristic of the invention, the system comprises an electromechanical relay arranged between the fusible element and the electric motor and / or an electromechanical relay arranged between the electronic control unit and the electric motor.

The invention also relates to a computer program comprising a series of instructions implementing the steps of the method as described above when they are executed by a processor.

The subject of the invention is also a computer-readable non-transient storage medium comprising a computer program as described above.

Other characteristics and advantages of the invention will become apparent on reading the description which follows. This is purely illustrative.

Front panel ventilation system and brush motor

The present invention relates to a method for starting a front panel ventilation system for a motor vehicle, as well as the associated front panel ventilation system.

The front panel ventilation system according to the present invention comprises a brushed electric motor.

The front ventilation system includes an air circulation fan, controlled by the brushed electric motor.

The electric motor advantageously comprises a rotor and a stator.

The stator comprises for example a plurality of electromagnetic excitation coils of the rotor while the rotor comprises a multipolar magnet.

The electric motor is configured so that when the coils are supplied with electric current, a magnetic field is created, causing a rotational movement of the multipole magnet around an axis of rotation.

The brushes of the electric motor make it possible to ensure electronic switching of the power supply to the coils, the electric current being injected via the brushes to a rotary collector itself connected to the rotor.

The front ventilation system includes a fuse element to prevent engine blockage.

The fuse element is preferably a thermal fuse element.

The system includes an electronic brush motor control unit for controlling the electric motor according to a starting method described later.

The front panel ventilation system also includes an electromechanical relay arranged between the fuse element and the electric motor and / or an electromechanical relay arranged between the electronic control unit and the electric motor.

Method of starting the front ventilation system

As already indicated, the invention relates to a method for starting the front panel ventilation system described above.

The starting method comprises a step of starting said motor at a maximum speed of rotation of the electric motor.

For example, depending on the size of the motors, a maximum speed greater than 40A can be obtained. During this step, a maximum torque, for example greater than 2Nm for a small motor of 0.85 Nm, is applied to the motor.

The torque is proportional to the electric current, and the resulting friction force makes it possible to overcome the bonding force of the brushes on the collector.

The duration of the start-up step is chosen so that the friction force has the effective time to take off the brushes from the collector.

The start-up stage lasts for example between 10 seconds and one minute.

Preferably, the start-up step lasts less than five seconds, and preferably two seconds.

The starting process comprises a step of reducing the engine speed to a speed, called intermediate, lower than said maximum speed.

The speed reduction step is later than the engine start step.

For example, the intermediate speed corresponds to an electric current between 10A and 12A, depending on the dimensions of the motor and the chosen intermediate speed.

The invention also relates to the use of the starting process as described above each time the motor vehicle is woken up, or at a given frequency, for example once a day.

The use according to the present invention ensures that the engine is never blocked.

Claims (10)

1. A method of starting a front face ventilation system for a motor vehicle, the front face ventilation system comprising a brushed electric motor, the method comprising a step of starting said motor at a maximum speed of rotation of the motor. engine. 2. A starting method according to claim 1, comprising a step of reducing the speed of the motor to a speed, called intermediate, lower than said maximum speed of the fan motor unit provided with a brush motor. 3. Starting method according to one of claims 1 or 2, wherein the start-up step lasts between 0.1 seconds and one minute, preferably between 1 second to 2 seconds. 4. The starting method according to claim 1, in which the start-up step lasts less than five seconds, and preferably two seconds. 5. Starting method according to one of claims 2 to 4, wherein the intermediate speed corresponds to an electric current between 10A and 12A. 6. Use of the starting method according to one of the preceding claims each time the motor vehicle is woken up or once a day. 7. Front panel ventilation system for a motor vehicle, comprising a fusible element for preventing the blocking of the motor, an electronic control unit for the brush motor according to the starting method according to one of claims 1 to 5 or according to use according to claim 6. 8. Front panel ventilation system according to the preceding claim, comprising an electromechanical relay arranged between the fuse element and the electric motor and / or an electromechanical relay arranged between the electronic control unit and the electric motor. 9. Computer program comprising a series of instructions implementing the steps of the method according to one of claims 1 to 5 when they are executed by a processor. 5 10. A non-transient computer-readable storage medium comprising a computer program according to the preceding claim.