US20190010939A1 - Method for detecting a blocked valve of a coolant compressor and a control system for a coolant compressor - Google Patents

Method for detecting a blocked valve of a coolant compressor and a control system for a coolant compressor Download PDF

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Publication number
US20190010939A1
US20190010939A1 US16/069,233 US201716069233A US2019010939A1 US 20190010939 A1 US20190010939 A1 US 20190010939A1 US 201716069233 A US201716069233 A US 201716069233A US 2019010939 A1 US2019010939 A1 US 2019010939A1
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United States
Prior art keywords
electric motor
max
coolant compressor
coolant
time span
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Abandoned
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US16/069,233
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English (en)
Inventor
Ralf Karp
Hans WIGH
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Secop GmbH
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Nidec Global Appliance Germany GmbH
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Assigned to NIDEC GLOBAL APPLIANCE GERMANY GMBH reassignment NIDEC GLOBAL APPLIANCE GERMANY GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KARP, RALF, WIGH, Hans
Publication of US20190010939A1 publication Critical patent/US20190010939A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • 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
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/025—Stopping, starting, unloading or idling control by means of floats
    • 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
    • F04B51/00—Testing machines, pumps, or pumping installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/025—Motor control arrangements
    • 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
    • F04B2201/06—Valve parameters
    • 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
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0201—Current
    • 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
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0205—Temperature
    • 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
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0209—Rotational speed
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/15—Power, e.g. by voltage or current
    • F25B2700/151—Power, e.g. by voltage or current of the compressor motor

Definitions

  • the present invention relates to a method for detection of a blocked valve of a coolant compressor having a drive unit and a piston/cylinder unit for cyclical compression of a coolant, wherein the drive unit has an electric motor for drive of the piston/cylinder unit, wherein the speed of rotation of the electric motor is monitored.
  • the present invention relates to a control system for the coolant compressor, the coolant compressor comprising a drive unit and a piston/cylinder unit for cyclical compression of a coolant, wherein the drive unit has an electric motor for drive of the piston/cylinder unit, and wherein the control system has control electronics.
  • a possible error state exists if a valve is blocked. In this regard, this can particularly involve a blocked suction valve or pressure valve.
  • a solenoid valve in the coolant circuit can also be defective, which solenoid valve does not necessarily have to be part of the coolant compressor.
  • the blocked valve has the result that coolant in the cooling circuit can no longer be transported to the extent required for cooling, or not at all, and cooling therefore can no longer take place.
  • the usage apparatus that controls the coolant compressor for example a refrigerator, determines that the temperature is not dropping, and then usually regulates the coolant compressor to maximal cooling power, so that the electric motor runs at the maximal speed of rotation—without success, however, since the coolant can no longer be transported in the cooling circuit.
  • the coolant compressor In order to prevent the coolant compressor from permanently continuing to run at the highest speed of rotation due to the error state, it is known from the state of the art to define the increase in temperature of the compressor, for example above a certain limit temperature, as a termination condition. In other words, the temperature is continuously monitored, and if the limit temperature is exceeded and the electric motor preferably runs at the maximal speed of rotation when this happens, the electric motor is shut off.
  • maximal speed of rotation should always be understood to be the maximal speed of rotation that the coolant compressor or the electric motor actually reaches in the present cooling circuit.
  • this maximal speed of rotation can deviate from a theoretically technically possible maximal speed of rotation of the electric motor, for example because for noise reasons, the usage apparatus does not make use of or demand the theoretically technically possible maximal speed of rotation of 4000 min ⁇ 1 , for example, but rather sets a lower speed of rotation of 3600 min ⁇ 1 , for example, as a “reference maximal speed of rotation.”
  • the most varied external circumstances, such as an overly low supply voltage, for example can lead to the result that the reference maximal speed of rotation (and, of course, also the theoretically technically possible maximal speed of rotation of the electric motor) is not achieved, so that the maximal speed of rotation is actually lower than the reference maximal speed of rotation (and, of course, also the theoretically technically possible maximal speed of rotation of the electric motor).
  • a typical monitoring parameter would be the current consumption of the electric motor, which, after having risen to a maximum, which amounts to 0.85 A, for example, drops back to a certain value—for example to 0.425 A—within a certain time span, while the electric motor is constantly running at the maximal speed of rotation.
  • the blocked valve can particularly be a blocked suction valve or pressure valve.
  • the blockage state can also be triggered by a different defective element in the cooling circuit, such as a solenoid valve, for example, which element does not necessarily have to be part of the coolant compressor.
  • this blockage state generally results in a blocked valve of the coolant compressor, in particular a blocked pressure valve of the coolant compressor, wherein the blocked valve blocks the mass flow of the coolant for the most part, preferably completely.
  • ⁇ X is 0.2, preferably ⁇ X is ⁇ 0.4, particularly preferably ⁇ X is ⁇ 0.5.
  • the percentage decrease in the value of the monitoring parameter must amount to at least 20%, preferably at least 40%, particularly preferably at least 50%.
  • the current consumption of the electric motor can be used as a monitoring parameter, which shows the behavior over time as described, in the blockage state.
  • a motor winding temperature and a temperature of control electronics of the electric motor or of the coolant compressor also demonstrate the same temperature behavior, and for this reason these temperatures are also suitable as monitoring parameters.
  • the monitoring parameter is a current consumption by the electric motor or a temperature of control electronics of the coolant compressor, particularly of the electric motor, or of a motor winding of the electric motor.
  • these temperatures must always be indicated relative to the ambient temperature of the coolant compressor. If the ambient temperature is 20° C. (room temperature), for example, and if 90° C. is measured as the maximal value, then X max must be indicated as being 70° C.
  • the determination of the maximal value X max takes place only after an initiation time span after detection of the maximal speed of rotation of the electric motor.
  • detection of the maximal speed of rotation defines a starting time or a starting point in time for the method.
  • the initiation time span is allowed to elapse immediately after the starting time or the starting point in time, before determination of the maximal value X max of the monitoring parameter is carried out.
  • the optimal initiation time span can be determined in experiments for different coolant compressor types, and then be predetermined accordingly, wherein the initiation time span typically amounts to several minutes. For this reason, it is provided, in a preferred embodiment of the method according to the invention, that the initiation time span amounts to at least 5 min, preferably at least 10 min, particularly preferably at least 15 min.
  • waiting for the verification time span is supposed to take possible fluctuations of the monitoring parameter into account, i.e. if the value of the monitoring parameter is correspondingly low even after the verification time span, it can be assumed, with great likelihood, that this lowering is not attributable to a random variation.
  • the optimal verification time span can be determined in experiments for different coolant compressor types and then be established accordingly, wherein the verification time span typically amounts at most to a few minutes. For this reason, it is provided, in a preferred embodiment of the method according to the invention, that the verification time span amounts to 15 s to 5 min, preferably 30 s to 3 min, particularly preferably 45 s to 1 min 30 s.
  • the first time span can also depend on the type of the coolant compressor and can be predetermined accordingly—in particular on the basis of conducted experiments. In this regard, it is provided, in a preferred embodiment of the method according to the invention, that the first time span amounts to at least 3 h, preferably at least 5 h, particularly preferably at least 6 h.
  • a corresponding error message is written into a readable memory provided for this purpose.
  • a corresponding error message is written into a readable memory provided for this purpose.
  • the respective writing into the readable memory makes it possible to make this information available to different control systems—for example a control system of the usage apparatus—for further processing.
  • a non-volatile memory such as a so-called FLASH, EPROM or NVRAM memory is involved, the information can also be read out at a later point in time for diagnosis purposes.
  • an operating method for operation of a coolant compressor comprising the method according to the invention, wherein after detection of the blocked valve, the electric motor is stopped.
  • an operating method for operation of a coolant compressor is provided, according to the invention, the operating method comprising the method according to the invention, wherein after verification of the detection of the blocked valve, the electric motor is stopped.
  • the electric motor does not consume any current in the stopped state, so that no unnecessary energy consumption takes place.
  • the cause for the blockage situation is sometimes no longer present after a restart of the coolant compressor.
  • a solenoid valve triggered the blockage situation, because it had not opened and thereby blocked the coolant circuit, and that this solenoid valve now opens as provided after all.
  • the electric motor is restarted after a second time span. Waiting for the second time span can serve, in this regard, to bring about a certain relaxation of the pressure conditions, and this can contribute to release of a blocked valve.
  • a temperature of the compressor can also relax or decrease during the second time span, and this can also contribute to release of a blocked valve.
  • the second time span can be kept relatively short, in particular in the second range.
  • the second time span amounts to at least 3 s, preferably at least 6 s, particularly preferably at least 15 s.
  • the values for the second time span can vary greatly, depending on the application.
  • the second time span amounts to maximally 60 min. In other words, it is assumed that the clocking valve must release within this maximal duration of the second time span, and otherwise an error state is assumed, in which the blocking valve is no longer released.
  • the coolant compressor comprising a drive unit and a piston/cylinder unit for cyclical compression of a coolant, wherein the drive unit has an electric motor for drive of the piston/cylinder unit and wherein the control system has control electronics, that the control electronics are set up for carrying out a method according to the invention and/or for carrying out an operating method according to the invention.
  • a coolant compressor having a drive unit and a piston/cylinder unit for cyclical compression of a coolant, wherein the drive unit has an electric motor for drive of the piston/cylinder unit, that the coolant compressor has a control system according to the invention.
  • the coolant compressor can be, in particular, a coolant compressor having a hermetically sealed housing, wherein the drive unit and the piston/cylinder unit are disposed in the housing.
  • FIG. 1 a schematic axonometric view of a coolant compressor according to the invention, with the top housing half removed,
  • FIG. 2 a diagrammatic illustration of the method according to the invention.
  • FIG. 1 shows a coolant compressor 1 according to the invention, wherein a hermetically sealed housing 2 of the coolant compressor 1 is shown only in part, i.e. a top half of the housing 2 has been removed in order to allow a view into the housing 2 .
  • a cylinder housing 3 of a piston/cylinder unit In the interior of the housing 2 , a cylinder housing 3 of a piston/cylinder unit can be seen.
  • the cylinder housing 3 is mounted on a drive unit 4 , which comprises an electric motor for drive of the piston/cylinder unit.
  • the electric motor drives a piston of the piston/cylinder unit in a cylinder, which cylinder is disposed in the cylinder unit 3 , by way of a crankshaft 10 and a piston rod.
  • a cyclical movement of the piston in the cylinder, along a cylinder axis is implemented in order to compress coolant.
  • the coolant is drawn into the cylinder by way of a suction muffler 9 and a suction valve disposed in the valve plate 6 , compressed, and conducted into a pressure pipe 8 that leads outward, by way of a pressure valve disposed in the valve plate 6 .
  • the coolant is subsequently conducted to a condenser (not shown) in a coolant circuit of a usage apparatus, such as a refrigerator, for example, into which coolant circuit the coolant compressor 1 is integrated.
  • the valve plate 6 is mounted on the cylinder in the region of a cylinder head, wherein a cylinder cover 5 can be seen in FIG. 1 , which is screwed onto the cylinder by means of screws 7 .
  • the valve plate 6 is disposed between the cylinder cover 5 and the cylinder.
  • the coolant compressor 1 is operated at a variable speed of rotation ⁇ , i.e. the speed of rotation ⁇ is dependent on the cooling power that is demanded by the usage apparatus.
  • the electric motor runs at a maximal speed of rotation ⁇ max , which typically amounts to 3000 min ⁇ 1 to 4000 min ⁇ 1 .
  • the blockage state can be caused by a blocked valve of the coolant compressor 1 or leads to a blocked valve of the coolant compressor 1 , since the valve, particularly the pressure valve, can no longer open properly due to the pressure conditions that are building up. The latter means that the pressure built up by the piston/cylinder unit is not great enough to overcome the counter-pressure that has built up due to the blockage state.
  • monitoring parameters of the coolant compressor 1 are constantly monitored so as to determine their progression over time.
  • a current consumption I of the electric motor as well as a temperature T of control electronics of the coolant compressor 1 or of the electric motor or of a motor winding of the electric motor are possible as monitoring parameters.
  • these temperatures must always be indicated relative to the ambient temperature (typically room temperature or 20° C.) of the coolant compressor.
  • FIG. 2 illustrates these method steps using the diagrammatic representation of the progression of I and T as a function of time t.
  • the time progression of the speed of rotation ⁇ of the electric motor is shown.
  • a predeterminable initiation time span t 0 is allowed to elapse first, so that a certain equilibrium of the pressure conditions can occur, before X max is determined.
  • t 0 amounts to at least 5 min, preferably at least 10 min, particularly preferably at least 15 min.
  • the current I for example, has increased to a value of X max ⁇ 0.85 A after the initiation time span to.
  • the determination of X t1 takes place after expiration of the first time span t 1 after the determination of X max , wherein t 1 typically amounts to at least 3 h, preferably at least 5 h, particularly preferably at least 6 h.
  • t 1 typically amounts to at least 3 h, preferably at least 5 h, particularly preferably at least 6 h.
  • the time that has elapsed between the first-time detection of the maximal speed of rotation ⁇ max and the determination of X t1 amounts to t 0 +t 1 .
  • ⁇ X a specific value can be predetermined for ⁇ X , wherein typically, ⁇ X ⁇ 0.2, preferably ⁇ X ⁇ 0.4, particularly preferably ⁇ X ⁇ 0.5 holds true.
  • verification of the detection of the blocked valve takes place for security, in that after the determination of X t1 , a relative short verification time span t 2 is allowed to elapse, and then a present value X t2 of the monitoring parameter is determined, and the condition (X max ⁇ X t2 )/X max ⁇ X is checked.
  • the verification time span t 2 amounts to 15 s to 5 min, preferably 30 s to 3 min, particularly preferably 45 s to 1 min 30 s.
  • the coolant compressor 1 has a control system having control electronics, which control electronics are set up for carrying out the said method.
  • control electronics Preferably, these control electronics also form the aforementioned control electronics of the electric motor.
  • control electronics are furthermore set up to carry out an operating method according to the invention, according to which the electric motor is stopped after verification of the blocked valve or the blockage state. Accordingly, in the lower diagram of FIG. 2 , the speed of rotation ⁇ drops from the maximal speed of rotation w max to 0.
  • the control electronics can be set up for restarting the electric motor after a relative short second time span t 3 .
  • the second time span t 3 amounts to only a few seconds, for example at least 3 s, preferably at least 6 s, particularly preferably at least 15 s.
  • the second time span t 3 is typically limited to maximally up to 60 min.
  • control system can have a memory into which a corresponding error message is written after detection or verification of the blockage state, which error message can then be read out of the memory again, in particular for diagnosis purposes.
  • the memory can serve for storing values to be called up during the method or operating method according to the invention, in particular for storing the values for ⁇ X , t 0 , t 1 , t 2 , and t 3 , for the specifically present coolant compressor 1 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
US16/069,233 2016-01-18 2017-01-16 Method for detecting a blocked valve of a coolant compressor and a control system for a coolant compressor Abandoned US20190010939A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT500082016 2016-01-18
AT50008/2016 2016-01-18
PCT/EP2017/050756 WO2017125334A1 (fr) 2016-01-18 2017-01-16 Procédé de détection d'une soupape bloquée d'un compresseur de réfrigerant et système de commande pour un compresseur de réfrigerant

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US16/069,233 Abandoned US20190010939A1 (en) 2016-01-18 2017-01-16 Method for detecting a blocked valve of a coolant compressor and a control system for a coolant compressor

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US (1) US20190010939A1 (fr)
EP (1) EP3405673B1 (fr)
CN (1) CN108700051B (fr)
AT (1) AT518199B1 (fr)
WO (1) WO2017125334A1 (fr)

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DE102020100296A1 (de) * 2020-01-09 2021-07-15 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Kompressorsystem und Verfahren zum Betreiben eines Kompressorsystems in Abhängigkeit des Druckluftbedarfs eines Betriebszustands des Fahrzeugs
CN112556090B (zh) * 2020-12-11 2022-07-08 四川长虹空调有限公司 空调系统堵塞的检测方法

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EP3405673B1 (fr) 2019-08-28
CN108700051A (zh) 2018-10-23
AT518199B1 (de) 2017-11-15
WO2017125334A1 (fr) 2017-07-27
CN108700051B (zh) 2019-12-31
EP3405673A1 (fr) 2018-11-28
AT518199A1 (de) 2017-08-15

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