EP2235369A1 - Steuergerät für eine kältemaschine und diese verwendendes haushaltskältegerät - Google Patents
Steuergerät für eine kältemaschine und diese verwendendes haushaltskältegerätInfo
- Publication number
- EP2235369A1 EP2235369A1 EP08861041A EP08861041A EP2235369A1 EP 2235369 A1 EP2235369 A1 EP 2235369A1 EP 08861041 A EP08861041 A EP 08861041A EP 08861041 A EP08861041 A EP 08861041A EP 2235369 A1 EP2235369 A1 EP 2235369A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- compressor
- control device
- control
- control signal
- switching
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
- F04B35/045—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric using solenoids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2201/00—Pump parameters
- F04B2201/02—Piston parameters
- F04B2201/0201—Position of the piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2201/00—Pump parameters
- F04B2201/02—Piston parameters
- F04B2201/0206—Length of piston stroke
Definitions
- the present invention relates to a control unit for a refrigerating machine, comprising a refrigerant circuit with a compressor and at least one switchable element, in particular for a refrigerating machine with a linear compressor, which is used in a home refrigeration appliance.
- linear compressors comprise a linearly oscillating armature in a magnetic field gap whose linear movement directly drives a compressor piston.
- the stroke of the armature depends on the strength and phase of the alternating magnetic field generated by the stator electromagnet, which drives its movement, and the damping applied to it by the compressor piston.
- the dead volume must be made as small as possible, i. the top dead center of the compressor piston must lie in the immediate vicinity of an end wall of a compressor chamber in which the piston moves.
- a striking of the piston against the end wall must be avoided, as this would significantly affect the life of the compressor.
- Object of the present invention is to provide a control unit for a refrigerating machine comprising a refrigerant circuit with a compressor and at least one switchable element, which eliminate the risk of damage to the compressor by striking due to changes in pressure drop in the refrigerant circuit in a simple manner or at least allowed to reduce significantly.
- control unit for such a refrigerating machine is set up to output a first control signal for controlling the compressor before each switching of the element.
- this control signal in good time, for example with a time advantage over the switching of the element, there is sufficient time to reduce the piston stroke during operation of the compressor to such an extent that changes in the piston damping or pressure surges to be expected from the switching process no longer occur Hitting the piston on the valves or the cylinder end wall can lead.
- the efficiency of the compressor is greatly reduced by the compressor's response to the first control signal, this is not significant as long as the period in which the efficiency is reduced is small compared to the operating time of the compressor under normal operating conditions.
- the control unit should preferably output the first control signal at least one second, better still several seconds, before the element is switched.
- a second control signal may be output to the compressor to signal that normal operation is to be resumed.
- the second control signal is preferably output one second, more preferably several seconds after the element is switched.
- the first control signal is a prevention
- the second control signal is an increase in the supply power supplied to the compressor.
- the first control signal may be a shutdown and the second control signal may be a reconnection of the supply current of the compressor.
- the supply power is not reduced to zero, but only as much as necessary to reduce the amplitude of oscillation to a safe value in order to quickly restore the high amplitude of normal operation in response to the second signal.
- the controller is preferably configured to switch the element while the oscillation amplitude of the linear compressor is different from zero. That is, even if the first control signal would lead to long-term stoppage of the compressor, the element can already be switched before the oscillation has subsided completely. Thus, the period in which the compressor operates with low efficiency can be kept short.
- the control unit is set up to output an AC supply voltage to the compressor, the first control signal may also be a phase jump of the AC supply voltage.
- the magnetic fields dampen the armature movement for a time until the phase of the latter has adapted to the new phase of the AC supply voltage.
- a second control signal is not required in this case because, while maintaining the changed phase, the amplitude of the armature movement reaches its steady state value after a certain time by itself.
- a time offset between the first control signal and the switching of the element is expediently chosen here so that the switching takes place approximately at the time at which the amplitude of the armature is minimal.
- the control device can expediently have a
- Control signal only then to switch the element when a release signal on the
- Enable signal input was received.
- Such an enable signal may be from
- Output of the sensor to be derived by a control circuit of the compressor itself or any other evaluation circuit.
- the invention further relates to a refrigerating machine with a linear compressor and a control device of the type described above, as well as a household refrigerator, which uses such a refrigerator.
- the element to be switched may in particular be a switching valve for controlling the refrigerant flow through an evaporator.
- FIG. 1 is a block diagram of a refrigerant circuit of a
- FIG. 2 shows an exemplary time profile of the supply voltage of the stator magnets of a
- Linear compressor a drive signal for a solenoid valve of the refrigerant circuit of FIG. 1 and the armature amplitude according to a first embodiment of the invention
- FIG. 3 shows an exemplary profile of the armature amplitude according to a second embodiment of the invention.
- FIG. 1 shows a block diagram of a refrigerant circuit for a household refrigerating appliance with a linear compressor 1, a condenser 2 connected to a pressure connection of the linear compressor 1 and two evaporators 5, 6 connected in parallel to an outlet of the condenser 2 via magnetic valves 3, 4.
- the evaporators 5, 6 are each arranged at separate, to be held at different temperatures compartments of a refrigeration device housing, not shown in the figure.
- linear compressor 1 Since the present invention is not limited to a specific construction of the linear compressor 1, the structure of the linear compressor 1 will not be described here. Detailed descriptions of suitable linear compressors can be found, for example, in DE 10 2006 009 271 A1, DE 10 2006 009 232 A1, DE 10 2004 062 307 A1, DE 10 2004 062 303 A1 and others.
- a control unit 7 for the linear compressor 1 is here divided into a digital module 8 and a power module 9.
- the digital module 8 can be implemented in particular in the form of a microcontroller, in addition to the tasks of the control of the linear compressor 1 explained in more detail below also the monitoring of Temperature of the evaporators 5, 6 to be cooled fan takes over.
- the power module 9 comprises a frequency converter which supplies the stator magnets of the linear compressor 1 with an alternating voltage whose frequency corresponds to the resonant frequency of the compressor 1.
- the of the Power assembly 9 under normal operating conditions fed into the linear compressor 1 electrical power is such that its armature amplitude is just below that would hit the compressor piston and end wall of the compressor together.
- This power can be fixed and have two or three different values, depending on whether the solenoid valve 3, the solenoid valve 4 or both are open; Preferably, it is regulated in a closed control loop by means of an armature amplitude measured on the linear compressor 1.
- the steady-state value of the amplitude is so high that if one of the valves 3, 4 was switched and in particular opened in the case of a linear compressor 1 operating in normal operation, the piston would strike in the linear compressor 1.
- the digital module 8 decides on the need to switch the solenoid valves 3 or 4, based on measured in the respective associated compartments of the refrigerator housing temperatures.
- the digital module 8 recognizes refrigeration demand in the compartment of the evaporator 6 at time t-i.
- the curve 1 1 denotes a drive level output from the digital board 8 to the power board 9 (or the amplitude of the AC voltage output from the power board 9 to the line compressor 1)
- curve 12 a drive level of the solenoid valve 4
- curve 13 the amplitude of the piston of the linear compressor 1.
- a straight line 14 represents the value of the piston amplitude at which it comes to the stop on the end wall of the compressor.
- the digital module 8 switches the Solenoid valve 4 on.
- the resulting pressure fluctuations are recognizable as small peaks of the curve 13. If, after about another five seconds of delay, at time t 3 , these pressure fluctuations have subsided with certainty, the digital subassembly continues
- FIG. 3 An alternative functional principle is explained in FIG. 3 on the basis of an exemplary time profile of the armature amplitude 13 '.
- the control unit 7 reacts to the detection of refrigeration demand in the evaporator 6 by inducing a phase jump in the output from the power assembly 9 to the linear compressor 1 AC voltage at time t.
- the consequence of the phase jump is a temporary reduction in the armature amplitude, which lasts until the phase of the armature has adapted to the new phase of the supply voltage.
- the armature amplitude passes through a minimum, the value of which depends on the extent of the phase jump. How long the linear compressor 1 takes to reach this minimum may, for example, be determined empirically.
- the time t 2 of the switching of the solenoid valve 4 is set. The pressure fluctuations induced by the switching gradually decrease again after t 2 , while the armature amplitude rises again and gradually approaches the steady state value.
- the flow of the controller of FIG. 2 or FIG. 3 can also be made directly dependent on the detected amplitude of the armature oscillation.
- a sensor for detecting the armature position of the compressor 1 is connected to an input 10 of the digital module 8.
- the signal provided by the sensor to the input may be a binary signal indicating whether the amplitude of the armature exceeds a threshold or not, or it may be a representative of the armature position or amplitude quantitative signal from which the digital assembly 8 is the binary Derived signal itself. If the amplitude falls below the limit value, this can not become so great that it comes to striking by the switching of the valve 4. Therefore, after the first control signal is output, the digital module 8 waits until the underflow of the limit value is detected, and then switches the valve 4.
- the second control signal can be generated at a predetermined time interval to the switching time t 2 , or it is detected on the basis of the signal at the input 10, when the amplitude fluctuations caused by the switching are sufficiently decayed, so that the second control signal can be spent without risk of striking.
- the detection signal of the armature position sensor can be used in the power module 9 or a control circuit of the linear compressor 1, not shown, in order to form a closed control loop for regulating the amplitude of the linear compressor 1.
- the signal level supplied by the digital module 8 11 can be used as representative of a desired value of the amplitude, ie from time ti to time t 3 , the power assembly 9 or the control circuit of the linear compressor, not shown controls its amplitude to a lower setpoint than before and after.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007060831A DE102007060831A1 (de) | 2007-12-18 | 2007-12-18 | Steuergerät für eine Kältemaschine und diese verwendendes Haushaltskältegerät |
PCT/EP2008/066859 WO2009077355A1 (de) | 2007-12-18 | 2008-12-05 | Steuergerät für eine kältemaschine und diese verwendendes haushaltskältegerät |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2235369A1 true EP2235369A1 (de) | 2010-10-06 |
Family
ID=40445772
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08861041A Withdrawn EP2235369A1 (de) | 2007-12-18 | 2008-12-05 | Steuergerät für eine kältemaschine und diese verwendendes haushaltskältegerät |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2235369A1 (de) |
DE (1) | DE102007060831A1 (de) |
WO (1) | WO2009077355A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014004619A1 (de) * | 2014-03-29 | 2015-10-01 | Gea Bock Gmbh | Regelung für Kälteanlage, sowie Kälteanlage und entsprechendes Regelverfahren |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3003331A (en) * | 1958-12-05 | 1961-10-10 | United Aircraft Corp | Electronic back pressure control |
GB8900251D0 (en) * | 1989-01-06 | 1989-03-08 | Jackson Peter K | Air conditioning system and operating method |
KR100474330B1 (ko) * | 2002-05-13 | 2005-03-08 | 엘지전자 주식회사 | 냉장고용 왕복동식 압축기의 운전제어장치 |
KR20040045093A (ko) * | 2002-11-22 | 2004-06-01 | 엘지전자 주식회사 | 히트펌프 시스템의 냉/난방 제어방법 |
KR100628588B1 (ko) * | 2003-02-21 | 2006-09-26 | 마츠시타 덴끼 산교 가부시키가이샤 | 모터 구동 장치, 공기 조화기, 냉장고, 극저온 냉동기,급탕기 및 휴대 전화 |
DE102004062303A1 (de) | 2004-12-23 | 2006-07-13 | BSH Bosch und Siemens Hausgeräte GmbH | Linearverdichter |
DE102004062307A1 (de) | 2004-12-23 | 2006-07-13 | BSH Bosch und Siemens Hausgeräte GmbH | Linearverdichter |
DE102006009271A1 (de) | 2006-02-28 | 2007-08-30 | BSH Bosch und Siemens Hausgeräte GmbH | Linearantrieb mit reduzierter axialer Kraftkomponente sowie Linearverdichter und Kältegerät |
DE102006009232A1 (de) | 2006-02-28 | 2007-08-30 | BSH Bosch und Siemens Hausgeräte GmbH | Linearverdichter und Antriebsaggregat dafür |
-
2007
- 2007-12-18 DE DE102007060831A patent/DE102007060831A1/de not_active Withdrawn
-
2008
- 2008-12-05 WO PCT/EP2008/066859 patent/WO2009077355A1/de active Application Filing
- 2008-12-05 EP EP08861041A patent/EP2235369A1/de not_active Withdrawn
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2009077355A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102007060831A1 (de) | 2009-06-25 |
WO2009077355A1 (de) | 2009-06-25 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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AX | Request for extension of the european patent |
Extension state: AL BA MK RS |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: BECHTOLD, MARIO Inventor name: NUNNINGER, STEFAN Inventor name: SCHUBERT, JAN-GRIGOR |
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DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: BSH HAUSGERAETE GMBH |
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17Q | First examination report despatched |
Effective date: 20170515 |
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18D | Application deemed to be withdrawn |
Effective date: 20180705 |