DE102019104286B4 - Method for controlling an air conditioning system and vehicle with air conditioning system - Google Patents

Abstract

The invention relates to a method for controlling an air conditioning system (10) for a vehicle (12). It is provided that by air conditioning the vehicle (12) a set minimum temperature (28) is generated in an interior (26). However, if the outside temperature (22) is higher than the set minimum temperature (28), the interior (26) is cooled (36) until the temperature (24) in the interior (26) corresponds to the outside temperature (22) minus a predetermined maximum difference (34).

Description

The invention relates to a method for controlling an air conditioning system for a vehicle according to the preamble of patent claim 1, an air conditioning system for a vehicle according to the preamble of patent claim 3 and a vehicle according to the preamble of patent claim 4.

In known air conditioning systems, for example in vehicles, fixed desired temperatures can be specified.

Particularly in the case of major fluctuations in the outside temperature, this can lead to a sharp increase in the power requirement of the air conditioning system, for example if the outside temperature rises from 18 °C or less to 25 °C or more during the day, while the desired temperature remains the same, for example 21 °C.

In addition to the higher energy consumption for air conditioning, this can also have a negative impact on the health of the user. It is well known that it is detrimental to health to move from a hot outside environment to an air-conditioned environment that is relatively cold. The operating comfort of the air conditioning system can also be reduced if the user has to adjust the desired temperature depending on the changing outside temperature.

The EP 3 179 175 A1 discloses an air conditioning system that selects a specific operating mode depending on the presence of a user in an indoor area.

The EP 3 220 070 A1 describes another air conditioning system with a number of distributed air conditioning units. The system is controlled in such a way that an energy-saving mode can be adopted even if individual air conditioning units have a high air conditioning power requirement.

From the DE 41 19 042 C2 There is also an air conditioning system that regulates the temperature as precisely as possible according to the user's perception of heat. For this purpose, either the heat entering the vehicle from the outside through sunlight or an entered target temperature is used to determine the target temperature.

From the EN 10 2016 200 940 A1 A method for air conditioning the interior of a vehicle is also known, whereby an interior temperature setpoint and a minimum interior temperature value are determined. In order to save energy, the air conditioning is controlled at least up to the minimum interior temperature value and can then be lowered in priority.

EN 10 2016 112 667 A1 discloses a method for operating a system for air conditioning an interior of a vehicle. The system comprises a room air conditioning device and a seat air conditioning device. Depending on whether the seat air conditioning device is active, a power of the room air conditioning device can be reduced.

DE 695 03 822 T2 discloses an air conditioning system for a vehicle in which a temperature difference between an outside temperature and an inside temperature is used to adjust an opening degree of an air flap.

The invention is based on the task of finding a technical solution with which the problems mentioned above no longer occur.

The object is solved by the subject matter of the independent patent claims 1, 3 and 4. Further preferred embodiments of the invention emerge from the remaining features mentioned in the subclaims.

• - Messung einer Außentemperatur und einer Temperatur eines Innenraums;
• - Vorgabe einer Mindesttemperatur für den Innenraum und einer maximalen Differenz zwischen der gemessenen Außentemperatur und der gemessenen Temperatur des Innenraums; und
• - Regelung der Temperatur des Innenraums unter der Maßgabe, dass oberhalb der vorgegebenen Mindesttemperatur eine Kühlung des Innenraums nur erfolgt, wenn die gemessene Temperatur des Innenraums höchstens um den Betrag der vorgegebenen maximalen Differenz unterhalb der gemessenen Außentemperatur liegt, und dass die vorgegebene Mindesttemperatur nicht unterschritten wird.

A first aspect of the invention relates to a method for controlling an air conditioning system for a vehicle, comprising at least the following steps:

• - Measurement of an outside temperature and an inside temperature;
• - specification of a minimum temperature for the interior and a maximum difference between the measured outside temperature and the measured temperature of the interior; and
• - Control of the temperature of the interior on the condition that, above the specified minimum temperature, cooling of the interior only takes place if the measured temperature of the interior is at most equal to the amount of the specified maximum difference below the measured outside temperature and that the specified minimum temperature is not undercut.

In other words, the air conditioning of the vehicle, for example, will produce the set minimum temperature in the interior of the vehicle. However, if the outside temperature is higher than the set minimum temperature plus the specified maximum difference, the interior will not be forced to cool down to the set minimum temperature, but will simply The interior is cooled until the outside temperature minus the specified maximum difference is reached. However, if the outside temperature is below the set minimum temperature, the interior is heated up to the set minimum temperature.

This has the advantage that the user always experiences a pleasant climate, since the temperature in the interior is always below the outside temperature when the outside temperature is hot, and at least at the set minimum temperature when the outside temperature is cold. In addition, air conditioning systems often have an additional air drying effect. At the same time, health is protected and colds caused by air conditioning are counteracted. In addition, the energy requirements of the air conditioning system are reduced, since when the outside temperature is hot, the maximum difference that has to be achieved through cooling is always the specified difference.

In a preferred embodiment of the invention, the minimum temperature is specified from an interval of 18 °C to 24 °C and the maximum difference is specified from an interval of 3 °C to 5 °C.

Of course, other intervals are also possible, but studies by the applicant have shown that the user's comfort is perceived as particularly high in the intervals mentioned. Based on the teaching disclosed here, the person skilled in the art is able to determine other intervals as appropriate, for example for specific target users. Target users can be differentiated from one another, for example, by defined climatic regions on earth and the climate habits associated with them.

Particularly preferred is the minimum temperature set at 21 °C and the maximum difference set at 3 °C.

A further aspect of the invention relates to an air conditioning system for a vehicle, designed to carry out a method according to the invention as described above.

The necessary sensors, control devices and heating or cooling machines are known to the expert.

A further aspect of the invention relates to a vehicle comprising an air conditioning system according to the invention as described above.

Preferably it is a motor vehicle.

The various embodiments of the invention mentioned in this application can be advantageously combined with one another, unless stated otherwise in individual cases.

• 1 einen schematischen Ablauf eines erfindungsgemäßen Verfahrens und
• 2 ein erfindungsgemäßes Fahrzeug.

The invention is explained below in exemplary embodiments with reference to the accompanying drawings. They show:

• 1 a schematic flow of a method according to the invention and
• 2 a vehicle according to the invention.

1 shows a schematic sequence of a method according to the invention for controlling an air conditioning system 10 for a vehicle 12 (see 2 ).

In 1 A temperature curve diagram is shown. The temperature 14 is plotted on the vertical axis, in this example in °C. It goes without saying that the unit of measurement can also vary.

The time t is plotted on the horizontal axis. Areas 16 to 20 describe, purely as examples, a point in time in the morning (area 16), a point in time in the early afternoon (area 18) and a point in time in the late afternoon (area 20).

In each of the areas 16, 18, 20, two bars are plotted, of which the left bar describes an outside temperature 22 and the right bar describes a temperature 24 in an interior 26. In this example, the interior 26 belongs to the vehicle 12.

In the method according to the invention, the outside temperature 22 is measured. In the morning, this is, for example, 18 °C.

Furthermore, a minimum temperature 28 is specified for the interior 26 of the vehicle 12. The specification is made, for example, by a user. For example, the minimum temperature 28 here is 21 °C.

Furthermore, the temperature 24 of the interior 26 is measured. In the morning, before the vehicle 12 is used, this temperature may initially correspond to the outside temperature 22 and is therefore initially below the specified minimum temperature 28.

As can be seen in area 16, the temperature 24 of the interior 26 is controlled 30 provided that the specified minimum temperature 28 is not undercut. Accordingly, the interior 26 is heated 32 in area 16.

In addition to the specification of the minimum temperature 28, a specification of a maximum difference 34 between the measured outside temperature 22 and the measured temperature 24 of the interior 26 is made. The amount of the difference 34 is set to 3 °C in this example.

If the outside temperature 22 rises to higher values over the course of the day, as can be seen in area 18, here for example 30 °C, the interior 26 is subjected to cooling 36 within the framework of the control 30.

The cooling 36 takes place under the condition that the interior 26 is cooled, but at most until a temperature 24 of the interior 26 is reached which is at most the amount of the predetermined maximum difference 34 below the outside temperature 22. The control 30 therefore includes a cooling 36 in area 18 from 30 °C to 27 °C.

Now, purely as an example, the outside temperature 22 drops again over the course of the day until it is in the area 20 at a value of 23 °C. It is therefore still 2 °C above the specified minimum temperature 28.

As part of regulation 30, cooling 36 is therefore continued. However, the restriction now applies that the minimum temperature 28 must not be undercut. Even if the maximum permissible difference 34 has been set to 3 °C, cooling 36 only continues until the minimum temperature 28 has been reached in the interior 26.

2 further shows a vehicle 12 according to the invention, in which an air conditioning system 10 according to the invention is provided. The vehicle 12 here is, by way of example, a motor vehicle 46.

The air conditioning system 10 comprises, for example, an outside temperature sensor 38, a temperature sensor 40 for the interior 26, a heating and cooling machine 42 for heating 32 and cooling 36 the interior 26 and a control device 44.

The control device 44 is designed to control the sequence of the method according to the invention described above.

List of reference symbols

10

Air conditioning system

12

vehicle

14

temperature

16

Areas

18

Areas

20

Areas

22

Outside temperature

24

temperature

26

inner space

28

Minimum temperature

30

regulation

32

Heating

34

difference

36

cooling

38

Outside temperature sensor

40

Temperature sensor

42

Heating and cooling machine

44

Control device

46

Motor vehicle

Claims (4)

Method for controlling an air conditioning system (10) for a vehicle (12), comprising at least the following steps: - measuring an outside temperature (22) and a temperature (24) of an interior (26); - specifying a minimum temperature (28) for the interior (26) and a maximum difference (34) between the measured outside temperature (22) and the measured temperature (24) of the interior (26); and - controlling (30) the temperature (24) of the interior under the proviso that above the predetermined minimum temperature (28), cooling (36) of the interior (26) only takes place if the measured temperature (24) of the interior (26) is at most the amount of the predetermined maximum difference (34) below the measured outside temperature (22), and that the predetermined minimum temperature (28) is not undercut. Procedure according to Claim 1 , characterized in that the minimum temperature (28) is specified from an interval of 18 °C to 24 °C and the maximum difference (34) is specified from an interval of 3 °C to 5 °C. Air conditioning system (10) for a vehicle (12), designed to carry out a method according to one of the preceding claims. Vehicle (12) comprising an air conditioning system (10) according to Claim 3 .

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