WO2008014730A1 - Klimatisierungssystem für ein fahrzeug und verfharen zum steuern eines klimatisierungssystems - Google Patents
Klimatisierungssystem für ein fahrzeug und verfharen zum steuern eines klimatisierungssystems Download PDFInfo
- Publication number
- WO2008014730A1 WO2008014730A1 PCT/DE2006/001357 DE2006001357W WO2008014730A1 WO 2008014730 A1 WO2008014730 A1 WO 2008014730A1 DE 2006001357 W DE2006001357 W DE 2006001357W WO 2008014730 A1 WO2008014730 A1 WO 2008014730A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conditioning system
- air conditioning
- temperature
- interior
- control unit
- 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, in particular such with a cold storage.
- the invention further relates to a method for controlling such an air conditioning system.
- Air conditioning systems with cold storage are used in particular for standard air conditioning, and they operate on the principle that the cold storage integrated in a refrigeration circuit are charged during engine operation, to then recharge them for cooling purposes with the engine off. It can be provided to always charge the cold storage with the engine running or to keep it in its charged state or to charge it whenever the energy introduced by a compressor in the refrigerant circuit is not needed for direct air conditioning of the vehicle interior. As a result, there may be charge-discharge cycles in which the existing cold in the cold storage is not needed to cool the interior but is lost during the life of the vehicle unused.
- the stationary air conditioning tion has two main tasks. One is to cool the interior of the vehicle for extended periods of time when the vehicle is at a standstill, for example the sleeping cabin of a commercial vehicle. Another advantage of stationary air conditioners is the possibility of pre-cooling a vehicle interior after the vehicle has heated up, for example due to intensive sunshine. The inmates thus have the opportunity to be in a refrigerated interior from the beginning. In this context, it has been noted as a problem that when ⁇ heavily heated interiors an extremely high amount of energy must be dissipated via the cooled from the cold storage heat exchanger, which can sometimes lead to excessive discharge of the cold storage or incomplete cooling of the interior.
- One concept couples the cold storage with the primary air conditioning system of the motor vehicle, namely by connecting an evaporator arranged in a cold storage in parallel to an evaporator used as an air cooler. About this refrigerant circuit, the cold storage can then be loaded. The removal of the cold takes place via a further circuit which contains a heat exchanger in the cold storage and a further heat exchanger for cooling the air to be introduced into the interior.
- self-contained cold storage systems are known. These are installed in addition to the conventional refrigerant circuit in the vehicle, and they have their own refrigerant circuit with a preferably electrically driven compressor. These systems, which in themselves function well, are still in view of the starting behavior of the electrically driven compressor be improved, namely in relation to the power required when starting the compressor.
- the object of the invention is to provide air-conditioning systems and methods for controlling air-conditioning systems in which unnecessary charging or inadvertent charging of the cold accumulator is avoided, the cooling of a strongly heated vehicle interior is accelerated and the start-up behavior of compressors is made less problematic ,
- this relates to an air conditioning system for a vehicle, comprising a cold accumulator, a device for charging the cold accumulator and a control unit for influencing the operating states of the air conditioning system, wherein an ambient temperature sensor is provided, which supplies the control unit with the ambient temperature characterizing signals, and wherein the control unit is designed so that a charging process of the cold accumulator can be initiated or suppressed depending on the ambient temperature.
- the ambient temperature of the vehicle is a decisive criterion as to whether a charging process of the cold storage may be unnecessary or whether in any case a charging Operation should take place. By taking the ambient temperature into account, the charging behavior of the air conditioning system can be improved.
- a charging of the cold accumulator is suppressible when the outside temperature falls below a predetermined temperature threshold. At temperatures that are so low that it is likely that no removal of cold from the cold storage will be desired, the charging of the cold storage is prevented in this way, resulting in energy savings.
- the user of the vehicle it is preferably possible for the user of the vehicle to charge the cold accumulator even at low outside temperatures by active intervention in the air conditioning system, for example in the case when the driver is aware that he will reach warmer regions in the foreseeable future.
- a charging process of the cold storage is automatically initiated when the outside temperature exceeds a predetermined temperature threshold and / or a predetermined temperature gradient.
- the charging function of the air conditioning system is inactive because either a low outside temperature is present or because the driver actively prevents the loading of the cold storage.
- a charge of cold storage can be initiated automatically, either at a predetermined outside temperature, which may well remain unnoticed in the interior of the vehicle, or in the event of a sharp increase in temperature, for example after crossing a mountain pass.
- this furthermore relates to a method for controlling an air-conditioning system. - -
- a vehicle with a cold storage, a device for charging the cold storage and a control unit for influencing the operating conditions of the air conditioning system, wherein an ambient temperature is detected and the control unit, the ambient temperature characterizing signals are supplied, and wherein a charging of the cold accumulator depending on the ambient temperature initiated or suppressed.
- a charging process of the cold accumulator is automatically initiated when the outside temperature exceeds a predetermined temperature threshold and / or a predetermined temperature gradient.
- this relates to an air conditioning system for a vehicle, comprising a cold accumulator, a device for charging the cold accumulator and a control unit for influencing the operating states of the air conditioning system, wherein an ambient temperature sensor is provided, which signals the ambient temperature characterizing signals to the control unit provides, wherein an internal temperature sensor is provided which provides the control unit, the vehicle interior temperature characterizing signals, and wherein the control unit so - -
- the first step towards reducing the temperature in the vehicle interior can often be achieved by replacing the air in the interior with outside air. Only when the interior temperature is only a few degrees higher than the outside temperature, a further air exchange is no longer sufficient, so that then the cooling can be used useful by unloading the cold storage. This cooling then starts from a lower temperature level, so that ultimately the cold charged in the reservoir can provide a lower temperature value in the interior or leads to the desired interior temperature in a shorter time. It is also conceivable that the introduction of outside air into the interior is not carried out prior to the start-up of the storage cooling but simultaneously with this, since this too can favor the initial rapid lowering of temperature.
- control unit is designed such that discharge of the accumulator for cooling purposes is assisted by an introduction of outside air into the interior when the outside temperature is lower than the inside temperature by a minimum amount.
- the introduction of outside air into the interior is all the more effective, the greater the difference between the interior temperature and the outside temperature. Consequently, it may be useful to make the air exchange only from a certain temperature difference, while waiving lower temperature differences on the initiation of measures for air exchange.
- the invention is advantageously further developed in that the introduction of outside air into the interior takes place by commissioning a blower.
- the second aspect of the invention further consists in a method for controlling an air conditioning system for a vehicle, comprising a cold accumulator, a device for charging the cold accumulator and a control unit for influencing the operating states of the air conditioning system, wherein an ambient temperature is detected and the control unit, the ambient temperature characterizing signals are detected, wherein a vehicle interior temperature is detected and the control unit, the vehicle interior temperature characterizing signals are supplied, and a discharge of the memory for cooling purposes by an introduction of outside air into the interior is then supported when the outside temperature is lower than that Internal temperature is.
- the inventive method may be designed so that the introduction of outside air into the interior takes place by commissioning a blower.
- this consists in an air conditioning system for a vehicle, with a
- Refrigeration circuit having a compressor, wherein parallel to the compressor, a controllable valve is connected, which can be controlled for the purpose of pressure equalization between the input side and the output side of the compressor in the open state.
- a controllable valve is connected, which can be controlled for the purpose of pressure equalization between the input side and the output side of the compressor in the open state.
- valve is a solenoid valve. - -
- the invention is particularly useful in the context that the compressor is an electrically driven compressor. While mechanical compressors driven by the internal combustion engine are less problematic in terms of starting pressure difference, in the case of electrically driven compressors, the power peaks required for startup may become a problem. In this respect, the invention can be used particularly in connection with these electrically driven compressors in a particularly advantageous manner.
- the refrigeration circuit has, in addition to the compressor, a condenser and an evaporator, wherein heat can be withdrawn by the evaporator from a cold storage.
- the air conditioning system is provided as a self-contained air conditioning system, that is, in addition to a conventional primary refrigerant circuit.
- a carbon dioxide sensor is provided in the interior of the vehicle, the output signals of a control unit are supplied, and that the control unit is designed so that depending on the detected carbon dioxide content fresh air operation, recirculation mode and mixed forms of these modes are selectable.
- the carbon dioxide content in the breathing air in the interior of the vehicle is a useful criterion for the need for air exchange.
- air conditioning is often selected for stand air conditioning in order to be able to work as efficiently as possible in this way, carbon dioxide detection provides a safety concept available, can be switched over with the increased carbon dioxide concentration on fresh air mode or a mixed form of recirculation and fresh air mode.
- Figure 1 is a schematic representation for explaining an air conditioning system according to the first and the second aspect of the invention
- FIG. 2 is a flowchart for explaining a method according to the first aspect of the invention
- FIG. 3 is a flowchart for explaining a method according to the second aspect of the invention.
- Figure 4 is a schematic illustration for explaining an air conditioning system according to the third aspect of the invention.
- FIG. 1 shows a schematic representation for explaining an air conditioning system according to the first and the second aspect of the invention.
- 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 vorlagertem expansion valve 38 is optional, and it can be used, for example, useful in the event that the refrigeration circuit 12 is to be optimally used for cooling various areas of the vehicle interior, for example, for cooling a 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 arranged within a cold accumulator 22 so that the cold accumulator 22 can be charged by the evaporator 40.
- a Solenoid valve 44 is provided in order to connect the evaporator 40 and the upstream expansion valve 42 optionally in the refrigerant circuit 12 and thus to cause a charging of the cold accumulator 22.
- the cold storage 22 is further connected to a coolant circuit 24, can be removed via the cold from the cold storage 22.
- the coolant circuit 24 includes a heat exchanger 46, a surge tank 48 with level sensor, a pump 50 and a 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. Furthermore, the coolant circuit is equipped with temperature sensors 54, 56 arranged on the input side and output side with respect to the heat exchanger 62 arranged in the cold accumulator 22, and a mass flow sensor 58 in the flow direction behind the pump 50. The aforementioned temperature sensors 52, 54, 56 and the mass flow sensor 58 are used to determine the state of charge in the cold storage 22, wherein the temperature sensor 52 in the refrigerant circuit 12, in particular in combination with the
- Mass flow sensor 58 and the pump power 50 is used to determine the state of charge, while the temperature sensors 54, 56 in the coolant circuit 24 by comparing the coolant inlet temperature anddeffenausgangstem- temperature and by using stored maps allow a determination of the state of charge of the cold accumulator 22.
- a control unit 26 is provided for detecting and influencing the operation of the air conditioning system 10. This control unit 26 receives signals from the temperature sensors 52, 54, 56, the mass flow sensor 58, a
- Speed sensor 28 which determines the speed of the motor vehicle engine, a speed sensor 30, a temperature sensor 60 for determining the ambient temperature, a temperature sensor 70 for determining the vehicle interior temperature and a carbon dioxide sensor 74. Furthermore, the control unit 26 is assigned 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. Consequently, refrigerant flows through the heat exchanger 62, it can give off heat there and then supplied to the heat exchanger 46 in the cooled state.
- 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.
- control unit 26 If, owing to the values transmitted by the sensors 28, 30, it is determined by the control unit 26 that the engine speed exceeds a predetermined value, so that there is typically a high load condition of the vehicle engine, the control unit 26 causes the control unit 26 to operate when the vehicle engine is running Cooling circuit 12 is deactivated while the coolant circuit 24 is activated. _
- the temperature sensors 60, 70 that is the outside temperature sensor 60 and the interior temperature sensor 70, are of particular importance. Since charging the cold accumulator 22 is undesirable when there is a relatively low outside temperature, it is possible for the controller 26 to suppress a charge even if it is requested for other reason at low outside temperature. On the other hand, when an outside temperature threshold or a rapid increase in the outside temperature is exceeded, the charging process can be initiated, even if this was not intended per se. For example, the desire expressed by the driver via input means that no charging of the cold accumulator 22 should take place can be ignored due to high temperatures or rapid temperature increases.
- outside temperature sensor 60 and the interior temperature sensor 70 influence the manner in which a heated vehicle is pre-cooled by means of cold accumulation discharge. If the outside temperature sensor 60 indicates a lower value than the inside temperature sensor 70, fresh air is supplied from the outside to pre-cool the interior. At the same time or only later, the unloading process is started for the purpose of cooling.
- the fresh air can be supplied via the not shown control of a blower, the sunroof motor and / or a Novamo- Torik, this control directly by the
- a further special role is played by the carbon dioxide sensor 74 arranged in the interior of the motor vehicle. If this determines a carbon dioxide content above a predetermined threshold, then recirculation mode switches over to mixed air or fresh air operation so as to avoid a depletion of oxygen in the interior space.
- FIG. 2 shows a flow chart for explaining a method according to the first aspect of the invention
- step SO6 if no charging of the accumulator according to step S05 is to take place per se, for example due to the driver's request, it is checked in step SO6 whether the outside temperature is above an outside temperature threshold or if the temporal rate of change of the outside temperature is greater than a predetermined change. rate of change threshold. If one of these conditions is satisfied, the memory is loaded in step S07. Otherwise, the memory will not be loaded as originally scheduled in step 08.
- an intervention option should always be available. If, for example, a charging process is initiated against the driver's request, then this is preferably communicated to the driver via a display, so that he can in turn suppress the automatically initiated charging process.
- FIG. 3 shows a flowchart for explaining a method according to the second aspect of the invention.
- FIG. 4 shows a schematic illustration for explaining an air conditioning system according to the third aspect of the invention.
- the air conditioning system 10 shown here includes a refrigeration circuit 112 equipped with an electrically driven compressor 114.
- the cooling circuit 112 is used exclusively for charging the cold accumulator 122 via the evaporator 140 arranged in the cold accumulator 122.
- the electric compressor 114 is bridged by a solenoid valve 172 which can be controlled electrically by means of the control 26.
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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 |
---|---|---|---|
DE112006004064T DE112006004064A5 (de) | 2006-08-03 | 2006-08-03 | Klimatisierungssystem für ein Fahrzeug und Verfahren zum Steuern eines Klimatisierungssystems |
PCT/DE2006/001357 WO2008014730A1 (de) | 2006-08-03 | 2006-08-03 | Klimatisierungssystem für ein fahrzeug und verfharen zum steuern eines klimatisierungssystems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE2006/001357 WO2008014730A1 (de) | 2006-08-03 | 2006-08-03 | Klimatisierungssystem für ein fahrzeug und verfharen zum steuern eines klimatisierungssystems |
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Publication Number | Publication Date |
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WO2008014730A1 true WO2008014730A1 (de) | 2008-02-07 |
Family
ID=37885827
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/DE2006/001357 WO2008014730A1 (de) | 2006-08-03 | 2006-08-03 | Klimatisierungssystem für ein fahrzeug und verfharen zum steuern eines klimatisierungssystems |
Country Status (2)
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DE (1) | DE112006004064A5 (de) |
WO (1) | WO2008014730A1 (de) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2862910A1 (fr) * | 2003-11-27 | 2005-06-03 | Valeo Climatisation | Gestion de la consommation de puissance energetique d'une boucle frigorifique d'un systeme de climatisation et / ou chauffage pour un vehicule |
EP1609638A2 (de) * | 2004-06-23 | 2005-12-28 | Behr GmbH & Co. KG | Verfahren zum Betreiben einer Klimatisierungseinrichtung für Fahrzeuge |
-
2006
- 2006-08-03 DE DE112006004064T patent/DE112006004064A5/de not_active Withdrawn
- 2006-08-03 WO PCT/DE2006/001357 patent/WO2008014730A1/de active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2862910A1 (fr) * | 2003-11-27 | 2005-06-03 | Valeo Climatisation | Gestion de la consommation de puissance energetique d'une boucle frigorifique d'un systeme de climatisation et / ou chauffage pour un vehicule |
EP1609638A2 (de) * | 2004-06-23 | 2005-12-28 | Behr GmbH & Co. KG | Verfahren zum Betreiben einer Klimatisierungseinrichtung für Fahrzeuge |
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Publication number | Publication date |
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DE112006004064A5 (de) | 2009-07-16 |
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