DE102021104438A1 - Procedure for controlling a ventilation system - Google Patents

Abstract

Method for controlling a ventilation system (150), in particular a ventilation system (150) for cooling electronic control devices, the ventilation system (150) having at least one fan (152) which comprises a first motor winding (154) and a second motor winding (156). , the first motor winding (154) being driven via a first channel (158) and the second motor winding (156) being driven via a second channel (162), the two motor windings (154, 156) being driven separately from one another.

Description

The invention relates to a method for controlling a ventilation system, in particular a ventilation system for cooling electronic control devices, and an arrangement for carrying out the method.

State of the art

Highly automated vehicles require fault-tolerant systems that can still transfer the vehicle to a safe state in the event of an error. An important component of fault-tolerant systems is the most fail-safe cooling of the system, i. H. that in the event of a fault in the cooling system, the remaining cooling line is sufficient, that the system does not suddenly fail and thus cause the vehicle to become a hazard.

Disclosure of Invention

Against this background, a method according to claim 1 and an arrangement with the features of claim 12 are presented. Embodiments result from the dependent claims.

The method described is used to control a ventilation system, in particular for cooling electronic control devices, the ventilation system having at least one fan comprising a first motor winding and a second motor winding, the first motor winding via a first channel and the second motor winding via a second channel is driven, and the two motor windings are driven separately from each other.

The fact that the two motor windings are controlled separately means that they can be controlled independently of each other. In principle, however, a dependency can also be taken into account when controlling the two motor windings. This enables redundant control.

The arrangement presented is used to carry out the method described and is implemented, for example, in hardware and/or software. Furthermore, the arrangement can be integrated in a control unit of a motor vehicle or designed as such.

The method presented and the arrangement described can be used in a fault-tolerant active cooling system, which in turn can be used in particular in highly automated vehicles. The ventilation system and the cooling system comprising this ventilation system are also considered herein to be the subject of the invention.

The ventilation system is characterized by a double winding of the electric fan motor and a redundant control. This design makes it possible to still provide a sufficiently high cooling capacity in the event of single faults.

• - hohe Verfügbarkeit,
• - bei Einfachfehlern wird noch eine Kühlung bereitgestellt,
• - Anpassung an verschiedene Lüftungslasten durch Schalten zwischen zwei Kanälen.

The method and arrangement presented have a number of advantages, at least in some of the versions:

• - high availability,
• - cooling is provided for single errors,
• - Adaptation to different ventilation loads by switching between two channels.

Further advantages and refinements of the invention result from the description and the accompanying drawings.

It goes without saying that the features mentioned above and those still to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

character list

• 1 shows a schematic representation of a cooling system.
• 2 shows an embodiment of a ventilation system that is controlled with a method of the type presented here.

1 shows a schematic, highly simplified representation of a cooling system 40 in which an active ventilation system 50 is used. The illustration shows a fan 52, control electronics 54 for this fan 52, monitoring electronics 56, a housing 58 and a sensor 62. A first arrow 64 shows a flow of a medium, a second arrow 66 shows a flow of air and/or a media.

The active ventilation system 50 thus has a fan 52 which can be controlled via the control electronics 54 . In principle, several fans can also be provided. The control electronics 54 have an interface 70 to the monitoring electronics 56, which can detect an error condition of the fan 52. In addition, the sensor 62 can optionally be used for the monitoring electronics 56, which can also detect the error.

In the event of an error, the monitoring electronics 56 recognize the failure of the cooling system and trigger the driving function. This should now continue to fully guarantee the functions for availability targets with a longer error tolerance time, e.g. 40 seconds.

2 FIG. 12 shows a ventilation system, designated generally by the reference numeral 150. FIG. This ventilation system 150 has a fan 152 in which a fan motor 153 with a first motor winding 154 and a second motor winding 156 is provided. In this case, the first motor winding 154 is controlled via a first channel 158 with a first control 160 . Correspondingly, the second motor winding 156 is controlled via a second channel 162 with a second control 164 .

In principle, any type of electrically operated motor can be used as the fan motor 153 .

The active ventilation system 150 thus consists of two redundant motor windings 154, 156 of the fan motor 153 and is characterized by their redundant activation, namely via the first channel 158 and the second channel 162.

The controls 160, 164 are independent of one another. In this way, common mode errors can be excluded.

• Variante A:

Betriebsmodi Kanal 1 Kanal 2 Kühlungsleistung #1 Aus Aus 0% #2 Ein Aus oder Fehler 34% #3 Aus oder Fehler Ein 66% #4 Ein Ein 100% The design of the control is designed in such a way that four operating modes can be implemented:

• Option A:

operating modes channel 1 channel 2 cooling performance #1 Out of Out of 0% #2 A off or error 34% #3 off or error A 66% #4 A A 100%

• Variante B:

Betriebsmodi Kanal 1 Kanal 2 Kühlungsleistung #1 Aus Aus 0% #2 Ein Aus oder Fehler 50% #3 Aus oder Fehler Ein 100% #4 Ein Ein 150% The thermal operating behavior must be designed in such a way that at 34% cooling capacity the system can still be brought into a safe state within a certain period of time.

• Variant B:

operating modes channel 1 channel 2 cooling performance #1 Out of Out of 0% #2 A off or error 50% #3 off or error A 100% #4 A A 150%

The percentages refer to the maximum nominal power of the fan, a short-term increase is possible.

The different cooling capacities in the second and in the third operating mode result from the different capacities of the motors.

The thermal operating behavior must be designed in such a way that with 50% cooling capacity the system can still be brought into a safe state within a certain time. Another advantage of this system is that certain thermal peaks can be absorbed better with a cooling capacity of up to 150%.

Claims (12)

Method for controlling a ventilation system (50, 150), in particular a ventilation system for cooling electronic control devices, the ventilation system (50, 150) having at least one fan (52, 152) which has a first motor winding (154) and a second motor winding ( 156), wherein the first motor winding (154) is driven via a first channel (158) and the second motor winding (156) is driven via a second channel (162), the two motor windings (154, 156) being driven separately from one another. procedure after claim 1 , in which in a first mode of operation the first channel (158) and the second channel (162) are switched off. procedure after claim 1 , in which, in a second operating mode, the first channel (158) is switched on and the second channel (162) is switched off. procedure after claim 3 , in which the ventilation system (50, 150) is controlled in the second operating mode in such a way that a cooling capacity of 34% is provided. procedure after claim 3 , in which the ventilation system (50, 150) is controlled in the second operating mode in such a way that a cooling capacity of 50% is provided. procedure after claim 1 , in which, in a third operating mode, the first channel (158) is switched off and the second channel (162) is switched on. procedure after claim 6 , in which the ventilation system (50, 150) is controlled in the third operating mode in such a way that a cooling capacity of 66% is provided. procedure after claim 6 , in which the ventilation system (50, 150) is controlled in the third operating mode in such a way that a cooling capacity of 100% is provided. procedure after claim 1 , in which the two channels (158, 162) are switched on in a fourth operating mode. procedure after claim 8 , in which the ventilation system (50, 150) is controlled in the fourth operating mode in such a way that a cooling capacity of 100% is provided. procedure after claim 8 , in which the ventilation system (50, 150) is controlled in the fourth operating mode in such a way that a cooling capacity of 150% is provided. Arrangement for controlling a ventilation system (50, 150) for carrying out a method according to one of Claims 1 until 11 is set up.

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