DE102008031791A1 - Air conditioning system operating method for motor vehicle, involves making indication to occupant that set nominal temperature is maintained or not reached without activation of cooling unit when cooling unit is deactivated - Google Patents

Abstract

The method involves setting nominal temperature for a portion of interior (20) of a vehicle i.e. motor vehicle (12). Target value is given by an inside temperature controller on the basis of current outside temperature, solar radiation and actual temperature. An air temperature conditioning device is controlled for conditioning temperature of air according to blow-out target value temperature. Indication is made to an occupant that the set nominal temperature is maintained or not reached without activation of a cooling unit (22) when the cooling unit is deactivated.

Description

The The invention relates to a method for operating a vehicle air conditioning system, having a manually on and off switchable cooling unit.

air conditioning Vehicles can be switched on with the cooling unit switched on ("AC" mode) or with the cooling unit switched off (Operating mode "ECON"). Usually There is an on and off function for the refrigeration unit on the user interface of the climate control unit or another air conditioning control unit.

In a variety of operating cases can be the predetermined or desired temperature in the interior by the occupants reach the vehicle even without operation of the cooling unit and keep (adjusting). However, the operator has the air conditioning not aware to what extent this is within the scope of the external Boundary conditions such as the current outside temperature and the Solar radiation (angle of incidence and intensity of solar radiation) possible is. Only on internal state variables, such as for example, the current manipulated variable for the temperature control element can be seen if a state is reached is that a compensation of disturbances, such as the outside temperature and the sunlight, impossible.

Is working the temperature control system against a manipulated variable limitation, The vehicle air conditioning will gradually become the interior of the vehicle increase the amount of air to be supplied per unit of time, to try with the cooling unit off, the desired Interior temperature despite increasing discharge temperature at the To obtain blow-out nozzles. This behavior of a vehicle air conditioner often leads to irritation of the occupants.

Examples of a previously described air conditioning can be found in DE 100 21 477 C1 and DE 100 21 484 C1 ,

task The invention is in a method for operating a vehicle air conditioning with a manually switched on and off the cooling unit Inmates of the vehicle to indicate whether turned off Cooling unit taking into account the outer Boundary conditions reach the set desired temperature and / or keep leaves.

• – von einem Insassen eine Solltemperatur für zumindest einen Teilbereich des Innenraums des Fahrzeuges eingestellt wird,
• – von einem Innenraumtemperaturregler anhand zumindest der aktuellen Außentemperatur, der Sonneneinstrahlung und der Isttemperatur im Innenraum ein Sollwert für die zum Erreichen und/oder Halten der eingestellten Innenraum-Solltemperatur erforderlichen Ausblastemperatur der dem Innenraum zuzuführenden Luft vorgegeben wird und
• – eine ein Kühl- und Heizaggregat aufweisende Lufttemperiervorrichtung zur Temperierung der Luft entsprechend der Ausblas-Sollwerttemperatur angesteuert wird,
• – wobei bei deaktiviertem Kühlaggregat dem Insassen angezeigt wird, dass und/oder wenn die eingestellte Innenraum-Solltemperatur ohne Aktivierung des Kühlaggregats nicht erreicht und/oder gehalten werden kann.

To solve this problem, the invention proposes a method for operating a vehicle air conditioning system with a manually switched on and off cooling unit, wherein the method

• An occupant sets a target temperature for at least a portion of the interior of the vehicle,
• - Is set by an interior temperature controller based on at least the current outdoor temperature, solar radiation and the actual temperature in the interior, a target value for reaching and / or holding the set indoor target temperature required outlet temperature of the air to be supplied to the interior and
• - A cooling and heating unit having Lufttemperiervorrichtung is controlled for controlling the temperature of the air according to the blow-off setpoint temperature,
• - Is displayed with deactivated cooling unit to the occupant that and / or if the set indoor target temperature can not be reached and / or maintained without activation of the cooling unit.

starting point The method according to the invention is a vehicle air conditioning system with an air temperature control device, a heating and a cooling unit having, wherein the cooling unit manually either can be switched on and off. In such a vehicle air conditioning For example, an occupant of the vehicle will set a target temperature for the interior of the vehicle or a specific one Area of the interior of the vehicle set. An interior temperature controller determined the required to reach or hold the set temperature set Discharge temperature of the air to be supplied to the interior, based on at least the current outside temperature, the solar radiation and the actual temperature in the interior of the vehicle. When the cooling unit is deactivated, it will then appear that and / or if the set interior setpoint temperature without Activation of the cooling unit can not be achieved or can be kept.

With the method according to the invention is the operator of the air-conditioned vehicle given a note that the desired Temperature in the interior with the currently selected Adjustment of the cooling unit not adjusted or with changing outside Influence parameters can no longer be maintained. This advice leaves the freedom of choice to the operator in each individual case whether the climate system is energy efficient, d. H. without switched cooling unit or in terms of optimized air conditioning, d. H. with on Cooling unit, should work.

In an advantageous embodiment of the invention, it is provided that the required for reaching and / or holding the set indoor target temperature outlet temperature of the air to be supplied to the interior in addition to the current outside temperature, solar radiation and the actual temperature in the interior also based on the current throughput of the interior air to be supplied, in other words, based on the current setting of a fan, is determined. In this case, the question of whether the desired temperature can be reached and / or maintained with the current operating settings and in particular without the refrigeration unit switched on is also included in the investigation of the fan. This also increases the comfort of the air conditioner, as an increasing blower power, with which, as described above, must be expected when the desired temperature can not adjust when the cooling unit is turned off, as disturbing, because it is associated with increasing noise, is felt.

Just like that, as displayed according to the invention with deactivated cooling unit will not reach or maintain a desired temperature lets, it is in an advantageous development of Invention also possible with activated cooling unit to indicate that the set indoor setpoint temperature can also be realized without activation of the cooling unit. In this case, so would the air conditioning to the operator indicate that it is from the "AC" mode on the operating mode "ECON" can switch without this is the possibility of the desired interior temperature to reach and / or keep impaired.

The Display or the respective indications for the occupants acoustically and / or optically or otherwise and in particular for a limited time.

The Invention will be described below with reference to an embodiment and two scenarios with reference to the drawing explained. In detail, they show:

1 , an air conditioning system of a vehicle,

2 a flowchart for a response of the air conditioner to operator inputs such that the operator is notified that the desired interior temperature can not be realized without activated air conditioning unit, and

3 a flowchart for a message of the air conditioner, which can no longer be realized due to changes in ambient climatic conditions, such as in particular outside temperature and sunlight, the desired interior temperature.

According to 1 has an air-side in this embodiment controlled air conditioning 10 for a motor vehicle 12 a fan 14 on, depending on the position of a fresh air / recirculation damper 16 Fresh air from a fresh air intake duct 18 or recirculating air from one in the interior 20 ending recirculating air duct 21 sucks. In the flow direction behind the blower 14 there is a cooling unit 22 including a compressor (not shown) and an evaporator 23 for cooling the intake air. Behind the evaporator 23 is a heater 24 arranged. The cooled air flows through in dependence on the position of the actuator of the heater 24 forming mixing flap 26 one of two channels connected in parallel 28 . 30 the heater 24 ,

One of these two channels (in the embodiment of the channel 30 ) has a flowed through by a part of the engine cooling water heat exchanger 32 for heating the previously cooled air. Behind the heat exchanger 32 are the two channels 28 . 30 merged again. In the flow direction behind the mixing flap 26 closes an air distribution device 34 on, the two flaps 36 . 38 optionally, the air over the Mannanströmöffnungen 40 , the defroster openings 42 and / or the Fußraumausströmöffnungen 44 in the interior 20 involved.

The control of the entire air conditioning 10 takes place such that a predetermined target temperature for the interior 20 achieved and maintained. For this purpose, the air conditioner 10 an indoor temperature sensor 46 on, which measures the actual value of the interior temperature and z. B. in the control unit 48 is housed. The control unit 48 has, among other things, an adjustment device 50 for manual specification of the setpoint for the interior temperature and via a setting device (for example button) for manual activation (operating mode "AC") and deactivation (operating mode "ECON") of the refrigerating unit 22 ,

In addition, the air conditioner has 10 another variety of sensors not described in detail here for example, the outside temperature, the sun's rays (in particular their intensity), the cooling water temperature, the pollutant concentration in the fresh air, etc. on. All of these sensors come with a central control unit 52 connected, which has at least one Ausblastemperaturregler and in particular an interior temperature controller with subordinate Ausblastemperaturregelung and in turn with the actuators for the cooling device 22 , the heater 24 , the blower 14 as well as the flaps 16 . 26 . 36 . 38 connected is.

2 shows an example of a flowchart for generating a message for the occupants of a vehicle that the desired interior temperature of the operating mode "ECON", ie when the cooling unit is switched off, not achieved or can be held (see step 54 ).

The operator selects a (new) indoor temperature setpoint and sets it accordingly (see step 56 ). If the indoor temperature controller has a control value limit for the temperature actuator (ie for the mixing damper 26 ) (see step 58 ), a message is sent to the operator (see step 60 ) that the connection of the cooling unit 22 (Operating mode "AC") makes sense. This display can be made, for example, by a temporary blinking of the setpoint display in the display of the control unit of the air conditioner or in the limited time flashing of the function feedback for the operating mode "AC". The operator can now decide (see step 62 ), whether he selects the operating mode "AC" or not (reduced comfort mode "ECON"). If it selects the operating mode "AC", the air conditioner will then work with the cooling unit switched on 22 (see step 64 ), whereas in the operating mode "ECON" it remains when the operator in step 62 not activated the "AC" function (see step 66 ).

3 shows an example of a flowchart for a notification of the air conditioner, if results without changing the indoor temperature setpoint due to the external influence parameters, a situation in which the air conditioner in the operating mode "ECON" the desired interior temperature can not reach or hold. It is assumed again that the air conditioner is in the "ECON" mode (see step 68 of the 3 ). The interior temperature controller detects that the temperature control element (mixing flap 26 ) reaches the Verstellbegrenzung for coldest possible air. This means that the desired interior temperature without switching the cooling unit 22 can not be realized (see step 70 ). This will be followed by a message (see step 72 ), as well as in connection with the step 60 of the 2 described, is formed. The operator can now in turn decide whether to select the operating mode "AC" (see step 74 ).

If this is omitted, the air conditioner will remain in ECON mode with reduced comfort (see step 76 ). In contrast, he activates in step 74 the "AC" function, the air conditioning system then operates in "AC" mode with the cooling unit switched on so that the desired interior temperature can be adjusted (see step 78 ).

The The invention has been described above by means of an air-side controlled air conditioning described. Of course you can also do it at one Air conditioning are used, which is controlled on the water side. The manipulated variable limit for the temperature actuator is given when the the hot water flow through the heat exchanger controlling water valves are permanently locked, so no warm Water flows through the heat exchanger and this so that it takes its lowest temperature.

10

air conditioning

12

motor vehicle

14

fan

16

Fresh air / recirculation damper, fold

18

Fresh air intake duct

20

inner space

21

return air duct

22

Cooling unit, cooler

23

Evaporator

24

heater

26

Mixing door, fold

28

channels

30

channels

32

heat exchangers

34

air distribution

36

fold

38

fold

40

Mannanströmöffnungen

42

defroster

44

Fußraumausströmöffnungen

46

Interior temperature sensor

48

control unit

50

adjustment

52

control unit

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10021477 C1 [0005]
• - DE 10021484 C1 [0005]

Claims (5)

Method for operating a vehicle air conditioning system with a manually switched on and off cooling unit, wherein in the method - from one inmate one Target temperature for at least a portion of the interior of the vehicle is set, - of an interior temperature controller based on at least the current outside temperature, the sunlight and the actual temperature in the interior of a setpoint for the for reaching and / or holding the set indoor target temperature required outlet temperature of the interior to be supplied Air is given and - one a cooling and heating unit having Lufttemperiervorrichtung for temperature control the air is controlled in accordance with the outlet setpoint temperature becomes, - with deactivated cooling unit the occupant is shown that and / or when the set Interior setpoint temperature without activation of the cooling unit can not be reached and / or held. Method according to claim 1, characterized in that the indoor temperature controller sets the setpoint for the Outlet temperature additionally based on the current throughput determined from the interior air to be supplied. Method according to claim 1 or 2, characterized that is displayed to the occupant with activated cooling unit is that and / or if the indoor temperature set temperature achieved and / or maintained without activation of the cooling unit can be. Method according to one of claims 1 to 3, characterized in that the display or the displays for the occupants acoustically and / or visually done or done. Method according to one of claims 1 to 4, characterized in that the display or the displays for the inmates are temporary / done.