DE102015202621A1 - Air conditioning system for a motor vehicle and method for its control - Google Patents

Air conditioning system for a motor vehicle and method for its control

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Publication number
DE102015202621A1
DE102015202621A1 DE102015202621.3A DE102015202621A DE102015202621A1 DE 102015202621 A1 DE102015202621 A1 DE 102015202621A1 DE 102015202621 A DE102015202621 A DE 102015202621A DE 102015202621 A1 DE102015202621 A1 DE 102015202621A1
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Germany
Prior art keywords
3b1
3b2
automation
climate
organs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE102015202621.3A
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German (de)
Inventor
Viktor Bader
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Volkswagen AG
Original Assignee
Volkswagen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Priority to DE102015202621.3A priority Critical patent/DE102015202621A1/en
Publication of DE102015202621A1 publication Critical patent/DE102015202621A1/en
Application status is Pending legal-status Critical

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING, OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00964Control systems or circuits characterised by including features for automatic and non-automatic control, e.g. for changing from automatic to manual control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING, OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/0073Control systems or circuits characterised by particular algorithms or computational models, e.g. fuzzy logic or dynamic models
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING, OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00735Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models

Abstract

The invention relates to a method for controlling an air-conditioning system of a motor vehicle with a plurality of sensors, a plurality of air-conditioning elements (3a1, 3a2, 3b1, 3b2, 3c1, 3c2), one with the sensors and the air-conditioning elements (3a1, 3a2, 3b1, 3b2, 3c1, 3c2) coupled to the control unit and actuators for manual adjustment of at least some of the air conditioning units (3a1, 3a2, 3b1, 3b2, 3c1, 3c2), at least some of the air conditioning units (3a1, 3a2, 3b1, 3c1, 3c2) according to at least some of the automation rules. The invention is characterized by the fact that the climate organs (3a1, 3a2, 3b1, 3b2, 3c1, 3c2) are grouped into hierarchically structured automation groups (1, 2a, 2b, 3a, 3b, 3c) which have hierarchically structured automation rules and that - in the case of a manual setting of a previously automatically operated air conditioning unit (3b2), the remaining air conditioning units (3a1, 3a2, 3b1, 3c1, 3c2) continue to operate according to those automation rules which correspond to their respective automation group of the highest hierarchical level (3b1, 3a; 3c, 2b). The invention further relates to a corresponding air conditioning system.

Description

  • The invention relates to a method for controlling an air conditioning system of a motor vehicle
    • A plurality of sensors, by means of which current values of comfort and / or climate parameters in a passenger compartment of the motor vehicle can be detected,
    • A plurality of climate organs, by the actuation of which the climate parameters can be influenced,
    • A control unit coupled to the sensors and the air conditioning units and having a storage unit in which automation rules for the automatic control of the air conditioning units are stored as a function of the comfort and / or climatic parameters detected by the sensors, and
    • Actuators for the manual adjustment of at least some of the climatic organs,
    wherein at least some of the air conditioning units are operated according to at least some of the automation rules.
  • The invention further relates to an air conditioning system for a motor vehicle
    • A plurality of sensors, by means of which current values of comfort and / or climate parameters in a passenger compartment of the motor vehicle can be detected,
    • A plurality of climate organs, by the actuation of which the climate parameters can be influenced,
    • A control unit coupled to the sensors and the air conditioning units and having a storage unit in which automation rules for the automatic control of the air conditioning units are stored as a function of the comfort and / or climatic parameters detected by the sensors, and
    • - Actuators for manual adjustment of at least some of the climate organs.
  • Such air conditioning systems and control methods therefor are known from the DE 103 38 790 B3 ,
  • Automated air conditioning systems for motor vehicles have been known for a long time. They can assume very complex structures under the ever-increasing demands for comfort, which are placed particularly on motor vehicles of higher segments.
  • In particular, a wide variety of air conditioning systems, such as blowers, seat heaters or ventilation, infrared heaters, etc. may be included, which can be sought as air conditioning goals, a global climate in the passenger compartment or seating micro-climates. To control such complex air conditioning systems, control circuits are typically set up by means of which air-conditioning systems are controlled as a function of sensors distributed in the passenger compartment or of their current measured values. The number and type of sensors are adapted to the complexity of the respective air conditioning system. For example, temperature and air flow sensors, temperature and humidity sensors integrated into the seat, infrared sensors for measuring the skin temperature, eg. B. in the face area of the driver, etc. use. The dependency rules between the sensor measurement data and the air conditioning control are typically stored in the memory of a central control unit. This can be realized in the form of tables, characteristic fields or mathematical calculation rules. Whether a particular air conditioning system is accepted and deemed successful by the vehicle customer depends very much on whether the automation rules stored in the control unit correspond to the user's personal comfort expectations. Since the personal comfort expectations can be individually very different and can also vary significantly with a person depending on the situation, hardly an air conditioning system will get along without the possibility of manual intervention by the user. Of crucial importance is the question of how the air conditioning system as a whole deals with the individual attitude of a climate organ.
  • A typical case is the manual reduction in blower power because a vehicle occupant feels impaired by high airflow levels set by the automatic to quickly heat up the vehicle. A typical reaction of known air conditioning systems is the deactivation of the automatic climate control, whereby all non-manually set air conditioning units maintain their current operating state. Any future change must then be manually set by the user.
  • From the above-mentioned, generic document an adaptive air conditioning system is known, recorded in the manual settings and integrated into the automation rules, so that future automatic settings better correspond to the manually set to learning time operating state of the system. Such an adaptive system is favorable if the motor vehicle is essentially used by a person for always identical purposes. However, if different people use different comfort concepts and in different situations (eg drive to work vs. return from exercise) the motor vehicle is learning, ie an optimization for special requirement constellations, rather counterproductive.
  • It is the object of the present invention to develop a generic air conditioning system and a method for controlling it in such a way that the user can make manual settings according to his current comfort expectations without having to do without the convenience of an automatic climate control.
  • This object is achieved in conjunction with the features of the preamble of claim 1, characterized
    • - That the climate organs are summarized to hierarchically structured, non-overlapping on each hierarchy level automation groups that are operable according to hierarchically structured automation rules, and
    • - That in the case of a manual setting of a previously automated air-conditioning device, the other previously operated automated and not to the manually set climate organ containing automation group belonging lowest hierarchy level belonging to the climate organs continue to those automation rules that their respective, the manually set climate organ not containing automation group highest hierarchical level assigned.
  • The object is also achieved in conjunction with the features of the preamble of claim 9 characterized
    • - That the climate organs are summarized to hierarchically structured, non-overlapping on each hierarchy level automation groups that are operable according to hierarchically structured automation rules, and
    • - That the control unit is set up in the case of a manual setting of a previously automated air conditioning system the other previously operated automatically, not to the manually set climate organ containing automation group lowest hierarchy level belonging climate organs weiterzubetreiben those automation rules, their respective, the manually set air conditioning unit not automation group of the highest hierarchical level are assigned.
  • Preferred embodiments of the invention are the subject of the dependent claims.
  • The basic idea of the invention is, in the case of a manual adjustment of an air-conditioning unit, to functionally detect and fulfill the actual comfort requirement of the user, while leaving the automatic system of the system as unimpaired as possible in connection with other comfort-functional aspects.
  • For this purpose, the climate organs are summarized in preferably functionally defined automation groups. These automation groups are non-overlapping, i. H. Each climate control organ is assigned to exactly one automation group at a hierarchical level. Several such automation groups, which may each include one or more climate organs, are then combined to form an automation group of the next higher hierarchical level, and so on down to a top hierarchy group. As is preferred, this idea is maximally exploited if each climate control organ forms an automation group of the lowest hierarchical level and if all existing climate organs are grouped together in an automation group at the highest hierarchical level. The number of intervening hierarchy levels and the classification of the corresponding automation groups depends essentially on the number and type of existing climate organs, the division should be made by the skilled person in particular according to effective criteria.
  • If an air conditioning device is manually set by the user, the invention provides for the automation of the affected automation group of the lowest hierarchical level to be abolished. If this automation group of the lowest hierarchical level only includes the manually set air conditioning unit, this cancellation means nothing else than the activation of the affected air conditioning unit according to the manual activation. If, however, the automation group of the lowest hierarchical level includes, in addition to the manually set air-conditioning unit, one or more further air-conditioning units-for example, two fans directed at one seat could represent an automation group of the lowest hierarchical level-then the automated activation of the other air-conditioning units contained in said automation group is also canceled. In the above example, the second fan would then no longer be controlled automatically. Instead, the manual setting of the first fan could also be transferred to the second fan. Generally speaking, it is preferably provided that all further air conditioning organs belonging to the automation group of the lowest hierarchical level of the manually set air conditioning unit are operated according to predetermined setting rules as a function of the manual setting of the manually set air conditioning unit.
  • All others, ie those not directly affected by the manual adjustment in the above sense However, climate organs should be operated as automated as possible. However, this can not be done automatically according to the previously valid automation rules. There are in fact all, the manually set climate organ somehow concerned automation rules higher hierarchical level due to the manual setting "disturbed", ie no longer applicable. Automation rules, which only apply to automation groups that do not include the manually set climate control system, are still applicable. In concrete terms, the invention provides for using in each case those automation rules which are assigned to the highest hierarchical level whose corresponding automation group no longer contains the manually set air-conditioning element. Each automation group of higher hierarchical level would also include the climate organ in question; accordingly, their associated automation rules would no longer be applicable. A concrete example for the summary of concrete climate organs in automation groups of different hierarchy levels will be given below in the special of this description.
  • As mentioned above, it is particularly advantageous to classify the automation groups and their hierarchy functionally with regard to the effect of the affected climate organs. Thus, it is provided in a preferred embodiment of the invention that all belonging to a selected seating area air conditioning units are combined to form a seat automation group. The seat automation groups are typically located at a fairly high hierarchical level, for example just below the top, the system level.
  • Alternatively or additionally, the climate organs can also be classified according to their mode of action. Thus, it can preferably be provided that all air conditioning organs designed as contact air conditioning units and belonging to a selected seating area are combined to form a contact automation group. For example, these may be seat heating and / or seat ventilation elements. The contact automation group may, for example, be located at a hierarchy level immediately below the hierarchy level of the seat automation group. However, it is not absolutely necessary to define a seat automation group on its own hierarchy level.
  • On the same hierarchical level as the contact automation groups, radiation automation groups can alternatively or additionally be provided. In particular, it is possible to combine all air-conditioning organs designed as radiation air-conditioning organs and belonging to a selected seating area into such a radiation automation group. The corresponding air-conditioning elements can be designed, for example, as infrared radiators.
  • Similarly, and preferably also arranged on the same hierarchical level air conditioning automation groups can be provided. Thus, it is conceivable to combine all of the air conditioning climate organs formed and belonging to a selected seating area air conditioning to such an air-conditioning automation group.
  • In an air conditioning system designed in this way, the manual reduction of a free-jet fan associated with a certain seat would lead to a corresponding reduction of all further free-jet fans possibly assigned to the same seat, whereas the contact and radiation air-conditioning systems would be automatically controlled according to their previous automation rules , On the other seats, where in the selected example no manual adjustment has taken place, the seat-specific automatic would continue to work without restrictions. At the highest hierarchical level, d. H. On the system level, which includes all seat automation groups, including the seat automation group containing the manually set climate organ, existing automation rules would have to be suspended.
  • On the basis of the local explanations, the person skilled in the art will be able to easily derive the procedure for manual adjustment of several air conditioning units.
  • Further features and advantages of the invention will become apparent from the following specific description and the drawings.
  • It shows:
  • 1 : a schematic representation of an exemplary hierarchical structure of the method according to the invention.
  • Like reference numerals in the figures indicate like or analogous elements.
  • 1 shows in a highly schematized representation fragmentary the hierarchical structure of the combination of climate organs in functional automation groups.
  • A top hierarchical level 1 , symbolized by the globe, stands for the fully automatic regulation of the global climate in the passenger compartment of a motor vehicle. In particular, you can here both seat-specific air conditioning mechanisms and seat-independent air conditioning mechanisms, such as front and rear windows, cargo space, etc., to be located. A fully automated control system on this highest hierarchical level corresponds to a control of all air conditioning units according to stored automation rules, without any air conditioning unit would be driven differently due to a manual setting.
  • At a second hierarchical level 2 Seat-specific climate control mechanisms are located. In 1 only the automation groups for the driver's seat are shown (left branch in 1 ) and the passenger seat (middle branch in 1 ). A right, at its end dashed branch in 1 indicates additional seat-specific automation groups and / or seat-independent automation groups, but these are not shown individually. The seat-specific automation groups on the second automation level bear the reference numbers 2a (Driver's seat) and 2 B (Passenger seat).
  • At the next lower hierarchical level 3 are the automation groups for the seat climate (reference number 3a ) the air climate (reference numeral 3b ) and the radiation climate (reference numeral 3c ), each for the seat concerned.
  • To seat climate wear in the example shown seat heating air conditioning 3a1 and ventilation air conditioning organs 3a2 at. Shown here is only one corresponding air organ. However, a further, finer ramification of the scheme, for example independently controllable seat and backrest heating elements, can be used by the person skilled in the art as required, which leads to a corresponding increase in the complexity of the scheme.
  • For air climate wear in the embodiment shown temperature-climate organs 3b1 and fan climate organs 3b2 at. The temperature-Klimaorgane are typically realized as mixing valves in the flow path of a fan and / or in the form of evaporator elements of an air conditioner.
  • For radiation climate wear in the illustrated embodiment, two IR emitters 3c1 . 3c2 at.
  • In 1 the case is hinted that the seat-specific fan 3b2 of the driver's seat is adjusted manually, as by the adjustment arrow 4 indicated. It follows that the fully automatic climate control, at least on the dash-dotted hierarchy shown in the passenger compartment is disturbed and must be repealed. The system can therefore no longer be operated according to the automation rules of the highest hierarchical level.
  • Also the automatic climate control on the second, d. H. on the seat hierarchy level, can not be maintained for the driver's seat. This is represented by the corresponding dot-dashed branch line. However, the situation is different for the passenger seat. Its climate control is not affected by the manually set fan. Accordingly, the air conditioning of the passenger seat can be carried out according to the automation rules of the second hierarchical level. This is shown by the solid branch lines.
  • In the area of the driver's seat, the air-conditioning can not maintain the automatic air-conditioning to which the manually-adjusted fan contributes. This is indicated by the corresponding dash-dotted branch line. The situation is different for the seating and radiation climate. Here rules can run according to the automation rules of the third hierarchical level, as indicated by the bold branch lines.
  • At the lowest hierarchical level shown, only the temperature air-conditioning element can be automatically controlled for the driver's seat air-conditioning. The also contributing to the air conditioning fan air conditioning unit is operated according to the manual setting. This is indicated by the corresponding bold or dash-dotted branch lines.
  • Regardless of the specific design of the embodiment shown specifically, the expert recognizes the inventive concept. Accordingly, all non-manually set air conditioning units are operated according to the automation rules of the highest possible hierarchy levels. The highest possible hierarchical level is in each case the hierarchical level of that automation group which no longer contains the manually set climatic organ. This means that the automation group of the next higher hierarchical level contains the climate organ in question and therefore the corresponding automation rules are disturbed by the manual setting.
  • Of course, the embodiments discussed in the specific description and shown in the figures represent only illustrative embodiments of the present invention. In the light of the disclosure herein, those skilled in the art will be offered a wide range of possible variations.
  • LIST OF REFERENCE NUMBERS
  • 1
    system
    2a, b
    seat-specific automation groups
    3a
    Automation group for the seat climate
    3b
    Automation group for the air conditioning
    3c
    Automation group for the radiation climate
    3a1
    Seat heating Air organs
    3a2
    Seat ventilation air organs
    3b1
    Temperature Air organs
    3b2
    Fan Air organs
    3c1, 3c2
    IR emitters
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • DE 10338790 B3 [0003]

Claims (9)

  1. Method for controlling an air conditioning system of a motor vehicle with - a plurality of sensors, by means of which current values of comfort and / or climate parameters in a passenger compartment of the motor vehicle can be detected, - a plurality of air conditioning devices ( 3a1 . 3a2 . 3b1 . 3b2 . 3c1 . 3c2 ), by the actuation of which the climate parameters can be influenced, - one with the sensors and the climate organs ( 3a1 . 3a2 . 3b1 . 3b2 . 3c1 . 3c2 ) coupled control unit, which has a memory unit in the automation rules for automatic control of the climate organs ( 3a1 . 3a2 . 3b1 . 3b2 . 3c1 . 3c2 ) are deposited as a function of the comfort and / or climatic parameters detected by the sensors, and - actuators for the manual adjustment of at least some of the air-conditioning organs ( 3a1 . 3a2 . 3b1 . 3b2 . 3c1 . 3c2 ), whereby at least some of the climatic organs ( 3a1 . 3a2 . 3b1 . 3c1 . 3c2 ) are operated in accordance with at least some of the automation rules, characterized in that - the climate organs ( 3a1 . 3a2 . 3b1 . 3b2 . 3c1 . 3c2 ) to hierarchically structured, non-overlapping automation groups at each hierarchical level ( 1 . 2a . 2 B . 3a . 3b . 3c ), which are operable according to hierarchically structured automation rules, and - that in the case of a manual adjustment of a previously automated air-conditioning device ( 3b2 ) the other previously operated automated and not to the manually set climatic organ ( 3b2 ) automation group of the lowest hierarchical level ( 3b2 ) belonging to climate organs ( 3a1 . 3a2 . 3b1 . 3c1 . 3c2 ) continue to be operated according to those automation rules which do not correspond to their respective automation group of the highest hierarchical level which does not contain the manually set climate control organ ( 3b1 ; 3a ; 3c ; 2 B ) assigned.
  2. A method according to claim 1, characterized in that any further of the automation group lowest hierarchy level of the manually adjusted air conditioning member associated air conditioning units are operated according to predetermined setting rules in dependence on the manual setting of the manually set air conditioning.
  3. Process according to claim 1, characterized in that all the climate organs ( 3a1 . 3a2 . 3b1 . 3b2 . 3c1 . 3c2 ) in an automation group at the highest hierarchical level ( 1 ) are summarized.
  4. Method according to claim 1, characterized in that each air-conditioning element ( 3a1 . 3a2 . 3b1 . 3b2 . 3c1 . 3c2 ) forms an automation group at the lowest hierarchical level.
  5. A method according to claim 1, characterized in that all belonging to a selected seating area air conditioning organs ( 3a1 . 3a2 . 3b1 . 3b2 . 3c1 . 3c2 ) to an automation group of a seat hierarchy level ( 2a . 2 B ) are summarized.
  6. A method according to claim 1, characterized in that all formed as a contact-Klimaorgane and belonging to a selected seating area air conditioning organs ( 3a1 . 3a2 ) to an automation group of a contact hierarchy level ( 3a ) are summarized.
  7. A method according to claim 5 to 6, characterized in that all belonging as a radiation-climate organs and a selected seating area air conditioning organs ( 3c1 . 3c2 ) to an automation group of a radiation hierarchy level ( 3c ) are summarized.
  8. Method according to Claim 1, characterized in that all the air-conditioning organs belonging to air-conditioning climate organs and to a selected seating area ( 3b1 . 3b2 ) an automation group to an automation group of an air-climate hierarchy level ( 3b ) are summarized.
  9. Air conditioning system for a motor vehicle with - a plurality of sensors, by means of which current values of comfort and / or climate parameters in a passenger compartment of the motor vehicle can be detected, - a plurality of air conditioning organs ( 3a1 . 3a2 . 3b1 . 3b2 . 3c1 . 3c2 ), by the actuation of which the climate parameters can be influenced, - one with the sensors and the climate organs ( 3a1 . 3a2 . 3b1 . 3b2 . 3c1 . 3c2 ) coupled control unit, which has a memory unit in the automation rules for automatic control of the climate organs ( 3a1 . 3a2 . 3b1 . 3b2 . 3c1 . 3c2 ) are deposited as a function of the comfort and / or climatic parameters detected by the sensors, and - actuators for the manual adjustment of at least some of the air-conditioning organs ( 3a1 . 3a2 . 3b1 . 3b2 . 3c1 . 3c2 ), characterized in that - the climate organs ( 3a1 . 3a2 . 3b1 . 3b2 . 3c1 . 3c2 ) to hierarchically structured, non-overlapping automation groups at each hierarchical level ( 1 . 2a . 2 B . 3a . 3b . 3c ), which are operable according to hierarchically structured automation rules, and - that the control unit is set up, in the case of a manual adjustment of a previously automated air-conditioning device ( 3b2 ) the other previously operated automated, not to the manually set climatic organ ( 3b2 ) automation group of the lowest hierarchical level ( 3b2 ) belonging to climate organs ( 3a1 . 3a2 . 3b1 . 3c1 . 3c2 ) Continue to operate according to those automation rules which do not correspond to their respective automation group of the highest hierarchical level, which does not contain the manual climate control organ ( 3b1 ; 3a ; 3c ; 2 B ) assigned.
DE102015202621.3A 2015-02-13 2015-02-13 Air conditioning system for a motor vehicle and method for its control Pending DE102015202621A1 (en)

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DE102015202621.3A DE102015202621A1 (en) 2015-02-13 2015-02-13 Air conditioning system for a motor vehicle and method for its control

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Application Number Priority Date Filing Date Title
DE102015202621.3A DE102015202621A1 (en) 2015-02-13 2015-02-13 Air conditioning system for a motor vehicle and method for its control

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19830274A1 (en) * 1998-07-07 2000-01-13 Opel Adam Ag Heating system for motor vehicles
DE10338790B3 (en) 2003-08-23 2004-11-18 Bayerische Motoren Werke Ag Operating vehicle air conditioning system, especially for motor vehicle, involves deriving learning value from automatic-manual control error using assessment factor, adapting automatic characteristic
DE102013214554A1 (en) * 2013-07-25 2015-01-29 Bayerische Motoren Werke Aktiengesellschaft Method for heating the interior of a vehicle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19830274A1 (en) * 1998-07-07 2000-01-13 Opel Adam Ag Heating system for motor vehicles
DE10338790B3 (en) 2003-08-23 2004-11-18 Bayerische Motoren Werke Ag Operating vehicle air conditioning system, especially for motor vehicle, involves deriving learning value from automatic-manual control error using assessment factor, adapting automatic characteristic
DE102013214554A1 (en) * 2013-07-25 2015-01-29 Bayerische Motoren Werke Aktiengesellschaft Method for heating the interior of a vehicle

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