WO2008014729A1 - Klimatisierungssystem für ein fahrzeug - Google Patents
Klimatisierungssystem für ein fahrzeug Download PDFInfo
- Publication number
- WO2008014729A1 WO2008014729A1 PCT/DE2006/001356 DE2006001356W WO2008014729A1 WO 2008014729 A1 WO2008014729 A1 WO 2008014729A1 DE 2006001356 W DE2006001356 W DE 2006001356W WO 2008014729 A1 WO2008014729 A1 WO 2008014729A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- temperature
- cold storage
- charge
- conditioning system
- cold
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00492—Heating, cooling or ventilating [HVAC] devices comprising regenerative heating or cooling means, e.g. heat accumulators
- B60H1/005—Regenerative cooling means, e.g. cold accumulators
Definitions
- the invention relates to an air conditioning system for a vehicle, with a refrigerant circuit in which a cold storage is incorporated.
- the invention relates to a method for determining the state of charge of a cold accumulator, which is part of an air conditioning system for a vehicle and integrated into a refrigeration circuit.
- the invention also relates to a method for extending the cooling time of an air conditioning system for a motor vehicle.
- the cold storage can be charged, for example via a compression refrigeration cycle and discharged via a coolant circuit.
- the cold storage preferably contains an evaporator connected to the compression refrigeration cycle and a heat exchanger connected to the coolant circuit.
- Phase change affects the mechanical properties of the cold storage.
- the invention is therefore based on the object to enable an accurate and reliable determination of the state of charge of the cold accumulator while eliminating the disadvantages of the prior art. This object is solved by the features of claim 1.
- the climate control system builds on the generic state of the art in that it comprises at least one temperature sensor for detecting the temperature of a fluid emerging from the cold storage fluid and an evaluation device based on the signal supplied by the at least one temperature sensor on the state of charge of the cold storage can close. This is based on the finding that the temperature of a fluid emerging from the cold accumulator, if appropriate in conjunction with further measured variables or characteristic curves, represents a reliable basis for determining the state of charge of the cold accumulator and can be detected comparatively easily.
- the fluid serving to charge the cold accumulator is refrigerant.
- the temperature of the fluid emerging from the evaporator acting, arranged in the cold storage heat exchanger fluid is determined.
- the temperature in the region of the refrigerant inlet of the heat exchanger arranged in the cold storage can be assumed to be known and constant, it is possible, solely on the basis of the knowledge of the temperature of the exiting refrigerant. teffens be closed on the state of charge of the cold storage. Because the temperature difference between the refrigerant inlet and refrigerant outlet represents a measure of the cold storage withdrawn heat / cold supplied at known compressor power.
- the evaluation device can access data that correlate the detected refrigerant temperature with the state of charge of the cold storage.
- the data can be stored, for example, in the form of one or more maps and map different conditions. For example, characteristic curves for different ambient temperatures, different output charging states, different compressor power levels and so on can be determined and stored, for example by experiment.
- the fluid is a coolant serving for discharging the cold accumulator.
- the coolant which may be formed by water or brine, for example, flows through a heat exchanger arranged in the cold accumulator and preferably provided only for discharging the cold accumulator.
- the basic idea of this solution is that, assuming that the cold storage is completely filled, for example, with ice at the beginning of the discharge process, the location at which the phase change occurs, during the discharge of the cold storage slowly migrates from the coolant inlet to the coolant outlet.
- higher temperatures than in the area of the refrigerant outlet may be present in the region of the refrigerant inlet, for example more than 0 0 C in the area of the refrigerant inlet and 0 0 C in the area of the refrigerant outlet.
- the further the location at which the phase change takes place approaches the refrigerant outlet the less the coolant can be cooled off and the higher the temperature of the coolant emerging from the cold storage, which represents a measure of the state of charge.
- the air conditioning system comprises a further temperature sensor for detecting the temperature of the coolant entering the cold storage.
- a further temperature sensor for detecting the temperature of the coolant entering the cold storage.
- About the temperature difference between the coolant inlet and the coolant outlet can be inferred more accurately on the current state of charge.
- the coolant flow quantity may in particular be the coolant mass flow or the coolant volume flow.
- Coolant flow size can either be detected by a sensor or determined, for example, via the operating data of a coolant pump.
- the coolant flow quantity of the temperature of the refrigerant entering the cold storage and the temperature of the coolant leaving the cold storage it is possible by means of balancing to determine the state of charge of the cold storage exactly, especially if the charge was exactly known at the beginning of the unloading process.
- the thermal energy supplied to the cold storage during its discharge is integrated, so that the difference between the initial state of charge and the value of the integral makes it possible to infer the current state of charge.
- the air conditioning system comprises aggyinnenraum- temperature control device that can hold the Temperaturist value in the vehicle interior depending on the state of charge of the cold storage higher than a predetermined temperature value to avoid too fast unloading of the cold storage. For example, it is possible for a vehicle occupant to set a temperature value of 20 ° C. in order to take a several-hour rest period of, for example, six hours at this temperature. Detects the vehicle interior temperature control device, which may be part of the evaluation that the state of charge of the cold storage does not allow the maintain 20 0 C for six hours, but it would be possible to maintain, for example, 22 0 C for six hours, so it fits the control technology relevant setpoint accordingly, that is, it puts him at 22 0 C. in addition to the current charge level of the cold store can more variables are considered self-evident, for example, the desired cooling time, the ambient temperature, solar radiation and so on.
- the inventive method builds on the generic state of the art in that at least the temperature of a fluid emerging from the cold storage fluid is detected and that determines the state of charge of the cold storage based on the at least one detected temperature becomes.
- the fluid serving to charge the cold accumulator is refrigerant.
- the fluid is a coolant serving for discharging the cold accumulator.
- a particularly accurate determination of the state of charge can be achieved if the method according to the invention provides that the determination of the state of charge on the basis of the coolant flow quantity, the temperature of the coolant entering the cold accumulator and the temperature of the coolant emerging from the cold accumulator are present.
- the invention also provides a method for extending the cooling time of an air conditioning system for a motor vehicle, in particular an air conditioning system according to the invention, in which a Temperaturistwert is kept higher than a predetermined temperature value in the vehicle interior depending on the state of charge of a cold storage to fast discharge of the cold storage to avoid.
- the state of charge of the cold accumulator can be determined in a preferred manner by the method according to the invention. For example, it is also possible in this case that a vehicle occupant sets a temperature value of 20 0 C to insert at this temperature a several-hour break of, for example, six hours.
- the control-relevant relevant setpoint is adjusted accordingly, that is, for example, 22 0 C set.
- further variables can be taken into account, for example the desired cooling duration, the ambient temperature, the solar radiation and so on.
- Figure 1 is a schematic representation of an air conditioning system according to the invention, which is suitable both for carrying out the first and the second embodiment of the method according to the invention for determining the state of charge of a cold storage;
- the illustrated system is also suitable for carrying out the method according to the invention for extending the cooling time of an air conditioning system for a motor vehicle.
- FIG. 1 shows a schematic representation of an inventive air conditioning system.
- the air conditioning system 10 comprises a refrigeration circuit 12.
- the refrigeration circuit 12 includes a compressor 14 driven by an engine, not shown, a condenser 16, a dryer / collector 32, an expansion valve 34, an evaporator 18, and a check valve 36 arranged in the order mentioned in the flow direction of the refrigerant. Parallel to the expansion valve 34 and the evaporator 18, a further expansion valve 38 and a further evaporator 20 may be arranged.
- an additional parallel arranged evaporator 20 with upstream expansion valve 38 is optional, and it can be used meaningfully, for example, in the case that the refrigeration circuit 12 for cooling various rich of the vehicle interior to be used optimally, for example for cooling a driver's cab and a sleeping cabin arranged behind it.
- the evaporators acting as a heat exchanger 18, 20 can be arranged in an optimized manner, where the cold is needed.
- Solenoid valves 66, 68 are furthermore provided in the parallel paths equipped with the evaporators 18, 20, so that the evaporators 18, 20 can be integrated jointly or optionally.
- an additional evaporator 40 is provided with upstream expansion valve 42.
- This evaporator 40 is disposed within a cold reservoir 22 so that the cold storage 22 can be charged by the evaporator 40.
- a solenoid valve 44 is provided in order to selectively integrate the evaporator 40 and the upstream expansion valve 42 in the refrigeration circuit 12 and thus to effect a charging process of the cold accumulator 22, a solenoid valve 44 is provided.
- the cold storage 22 is further connected to a coolant circuit 24, can be removed via the cold from the cold storage 22.
- Coolant circuit 24 includes a heat exchanger 46, a surge tank 48 with level sensor, a pump 50 and arranged in the cold storage 22 heat exchanger 62, wherein the coolant circuit 24 associated components are arranged in the flow direction of the coolant in that order.
- the refrigerant circuit 12 is furthermore equipped with a temperature sensor 52 arranged downstream of the evaporator 40 arranged in the cold storage 22.
- this temperature sensor 52 can be used to determine the state of charge of the cold storage tank. 22 will be closed. Namely, with known compressor power, it can be concluded from the temperature of the refrigerant exiting from the cold accumulator 22 how much heat has been removed from the cold accumulator 22, or how much cold has been supplied. To this
- Purpose are preferably further stored in maps parameters taken into account, for example, the initial state of charge, the ambient temperature and the respective compressor performance. These maps are preferably stored in the evaluation unit formed by the control unit 26. Although not absolutely necessary, it is preferred to operate only the evaporator 40 and to close the valves 66, 68 during the charging of the cold accumulator 22. In this way, the state of charge is not only accelerated, but there are also better defined flow conditions during loading, which facilitates the determination of the state of charge, or reduces the required amount of data stored in the form of the maps.
- the coolant circuit 24 is furthermore equipped with a temperature sensor 56, which is provided to detect the temperature of the coolant exiting the cold accumulator 22 in order to close the charge state of the cold accumulator 22 with the aid of this temperature via the second embodiment of the method according to the invention.
- a temperature sensor 56 which is provided to detect the temperature of the coolant exiting the cold accumulator 22 in order to close the charge state of the cold accumulator 22 with the aid of this temperature via the second embodiment of the method according to the invention.
- Cold storage tank moves slowly from the coolant inlet to the coolant outlet.
- higher temperatures than in the area of the refrigerant outlet for example, more than 0 0 C in the region of the refrigerant inlet and 0 0 C in the region of the refrigerant outlet.
- the further the place where the phase change takes place approaches the refrigerant outlet the less the refrigerant can be cooled and the higher the temperature of the refrigerant exiting the cold storage.
- a single temperature sensor 56 how far the place where the phase change (ice melt) takes place, has already migrated.
- a plurality of temperature sensors would have to be provided in the cold storage 22, which would of course be associated with significantly higher costs.
- a further temperature sensor 54 is provided with which the temperature of the coolant entering the cold accumulator 22 can be detected. In this case, it can be determined exactly how much the temperature of the coolant has been lowered. If the coolant mass flow is still detected by a mass flow sensor 58 or otherwise determined, for example, via the operating data of the coolant pump 50, it is even possible to determine the state of charge of the cold accumulator 22 precisely by means of balancing.
- the thermal energy supplied to the cold storage 22 during its discharge is integrated so that the current state of charge can be deduced from the difference between the initial state of charge and the value of the integral.
- the temperature of two fluids emerging from the cold accumulator 22 is determined to determine the state of charge, namely the temperature of the refrigerant during charging and the temperature during discharging. temperature of the coolant.
- a control unit 26 For detecting and influencing the operation of the air conditioning system 10, a control unit 26 is provided which, in the case shown, also forms the evaluation device with which the charge state of the cold accumulator 22 can be determined.
- This control unit 26 receives in addition to the signals of the temperature sensors 52, 54, 56 and the mass flow sensor 58 also signals from a speed sensor 28 which detects the speed of the motor vehicle engine, a speed sensor 30 and a temperature sensor 60 for determining the ambient temperature. Furthermore, the controller 26 is associated with a main switch 64.
- the air conditioning system 10 of the invention operates as follows. In the conventional air conditioning of the vehicle interior of the refrigerant circuit 12 is in a known manner in operation.
- the evaporators 18, 20 can be activated selectively or jointly.
- the air to be supplied to the interior is supplied to the evaporators 18, 20 by means of unillustrated blowers.
- the interior of the motor vehicle is thus cooled via the evaporators 18, 20 or optionally by one of these evaporators 18, 20.
- the cold storage tank 22 is discharged by activation of the coolant circuit 24 by the pump 50 being switched on by the control unit 26.
- refrigerant flows through the heat exchanger 62, it can give off heat there and then be supplied to the heat exchanger 46 in the cooled state. the. There, the cooled coolant is supplied with an air flow, which can subsequently be supplied to the interior. After flowing out of the heat exchanger 46 and flowing through the surge tank 58, the coolant is fed back to the pump 50.
- the discharging of the cold accumulator 22 thus represents, with regard to the cooling of the vehicle interior, a second operating state, which is conventionally used for stationary air conditioning.
- the control unit 22 can also form a temperature control device in order to be able to implement the method according to the invention for extending the cooling time of an air-conditioning system 10 for a motor vehicle.
- a temperature actual value in the vehicle interior is maintained higher than a predefined temperature value as a function of the charging state of the cold accumulator 22 in order to avoid discharging the cold accumulator 22 too quickly.
- the charge state of the cold accumulator 22 is determined in a preferred manner by the above-explained first and / or second embodiment of the corresponding method. As mentioned, for example, it is possible for a vehicle occupant to specify a temperature value of 20 ° C. in order to take a several-hour rest period of, for example, six hours at this temperature.
- the control-relevant relevant setpoint is adapted accordingly is set to 22 0 C, for example.
- other variables can be taken into account, for example, the desired cooling time, the ambient temperature, solar radiation and so on.
- the present invention has been explained using the example of an air conditioning system 10, in which the cold storage 22 is incorporated into the conventional vehicle air conditioning, that is loaded by the power of the compressor 14, which is driven directly by the vehicle engine.
- the invention can also be used in connection with other types of air conditioning systems.
- the system containing the cold storage 22 is made self-sufficient, that is from the conventional
- Vehicle air conditioning system is present separately.
- the self-sufficient air conditioning is then preferably equipped with an electric compressor, which is responsible for charging the cold storage. Occurs in such a system, the overload of the drive motor, so here also the conventional, not coupled with the cold storage air conditioning can be turned off and the air conditioning can be taken over by the self-sufficient air conditioning by their cold storage is discharged.
- a single control apparatus for controlling the self-sufficient air conditioner and the conventional vehicle air conditioner may be provided, or the controllers may be disconnected and able to communicate with each other.
- Another possibility is that separate control units for the conventional air conditioning and self-sufficient air conditioning are assigned to a higher-level control unit that coordinates the separate control units.
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112006004065T DE112006004065A5 (de) | 2006-08-03 | 2006-08-03 | Klimatisierungssystem für ein Fahrzeug |
PCT/DE2006/001356 WO2008014729A1 (de) | 2006-08-03 | 2006-08-03 | Klimatisierungssystem für ein fahrzeug |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE2006/001356 WO2008014729A1 (de) | 2006-08-03 | 2006-08-03 | Klimatisierungssystem für ein fahrzeug |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008014729A1 true WO2008014729A1 (de) | 2008-02-07 |
Family
ID=37898765
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2006/001356 WO2008014729A1 (de) | 2006-08-03 | 2006-08-03 | Klimatisierungssystem für ein fahrzeug |
Country Status (2)
Country | Link |
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DE (1) | DE112006004065A5 (de) |
WO (1) | WO2008014729A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013202986A1 (de) * | 2013-02-22 | 2014-08-28 | Behr Gmbh & Co. Kg | Verfahren zur Regelung und/oder Steuerung eines Kältemittelkreislaufes |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3819647A1 (de) * | 1987-06-19 | 1988-12-29 | Volkswagen Ag | Einrichtung zur temperierung des fahrgastraumes eines fahrzeugs |
DE19906497A1 (de) * | 1999-02-17 | 2000-08-24 | Behr Gmbh & Co | Verfahren und Einrichtung zur Regelung einer einen Kältespeicher umfassenden Klimaanlage |
DE10235581C1 (de) | 2002-08-03 | 2003-08-21 | Bayerische Motoren Werke Ag | Bestimmung eines Latentwärmespeicher-Ladezustandes, insbesondere in einer Heizungs- und/oder Klimaanlage eines Straßenkraftfahrzeuges |
DE102004030074A1 (de) | 2004-06-23 | 2006-01-12 | Behr Gmbh & Co. Kg | Verfahren zum Betreiben einer Klimatisierungseinrichtung für Fahrzeuge |
WO2006024168A1 (en) * | 2004-08-31 | 2006-03-09 | Groupe Énerstat Inc. | Climate control system for vehicle berths and cabs |
-
2006
- 2006-08-03 WO PCT/DE2006/001356 patent/WO2008014729A1/de active Application Filing
- 2006-08-03 DE DE112006004065T patent/DE112006004065A5/de not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3819647A1 (de) * | 1987-06-19 | 1988-12-29 | Volkswagen Ag | Einrichtung zur temperierung des fahrgastraumes eines fahrzeugs |
DE19906497A1 (de) * | 1999-02-17 | 2000-08-24 | Behr Gmbh & Co | Verfahren und Einrichtung zur Regelung einer einen Kältespeicher umfassenden Klimaanlage |
DE10235581C1 (de) | 2002-08-03 | 2003-08-21 | Bayerische Motoren Werke Ag | Bestimmung eines Latentwärmespeicher-Ladezustandes, insbesondere in einer Heizungs- und/oder Klimaanlage eines Straßenkraftfahrzeuges |
DE102004030074A1 (de) | 2004-06-23 | 2006-01-12 | Behr Gmbh & Co. Kg | Verfahren zum Betreiben einer Klimatisierungseinrichtung für Fahrzeuge |
WO2006024168A1 (en) * | 2004-08-31 | 2006-03-09 | Groupe Énerstat Inc. | Climate control system for vehicle berths and cabs |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013202986A1 (de) * | 2013-02-22 | 2014-08-28 | Behr Gmbh & Co. Kg | Verfahren zur Regelung und/oder Steuerung eines Kältemittelkreislaufes |
Also Published As
Publication number | Publication date |
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DE112006004065A5 (de) | 2009-07-16 |
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