CN101680693B - System and method of diagnosis through detection of mechanical waves in refrigeration systems and/or household appliances - Google Patents
System and method of diagnosis through detection of mechanical waves in refrigeration systems and/or household appliances Download PDFInfo
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- CN101680693B CN101680693B CN2008800181279A CN200880018127A CN101680693B CN 101680693 B CN101680693 B CN 101680693B CN 2008800181279 A CN2008800181279 A CN 2008800181279A CN 200880018127 A CN200880018127 A CN 200880018127A CN 101680693 B CN101680693 B CN 101680693B
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- 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
- F25B49/005—Arrangement or mounting of control or safety devices of safety devices
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- 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
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- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
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- Devices That Are Associated With Refrigeration Equipment (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
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Abstract
The present invention relates to a system and a method of diagnosis for a refrigeration system and/or household appliance which, based on a multiplicity of physical magnitudes detected, determine and inform the operating condition of said refrigeration system and/or of its components. Basically, the magnitudes are divided into two groups, namely: (i) those from which spectral signatures will be generated (magnitudes relating to mechanical vibrations); and (ii) magnitudes from which spectral signatures will not be generated. The spectral signatures are compared with the standard signatures, and the diagnosis is provided based on this comparison. After the operating condition has been diagnosed, it is stored in a database, and a record of the system operation is updated. The operating conditions are made available for viewing, and based on the record viewed, it is possible to determine whether or not the refrigeration system and/or household appliance and the components thereof are malfunctioning or not. The application further describes a compressor whose diagnosis can' be determined by the method and system of diagnosis according to the present invention.
Description
The application requires the priority of the brazilian patent No.PI702369-3 of submission on May 29th, 2007, is incorporated herein its disclosed content as a reference.
Technical field
The application relates to a kind of diagnostic system and method, can make that the operating conditions of household electrical appliance, refrigeration system and/or its assembly can be seen immediately or after a while.The invention further relates to a kind of compressor by diagnostic system of the present invention and method diagnosis.
Background technology
Refrigeration system is known by most of people usually.Therefore, because these systems are that people are required under many situation, their method of operating can be handled, control or diagnosed to exploitation is significant.But, before the kind of the method for mentioning some control refrigeration systems, need the example and the application thereof of the typical prior art of description refrigeration system.
Typically, refrigeration system comprises the loop, and cooling fluid is advanced therein and passed some assemblies, and the volume of fluid is inflated and compresses during advancing, and its temperature and pressure also rises and descends.When relating to fluid, the close relation of observing between the above-mentioned value is important.
The assembly that forms common refrigeration system for example is: compressor, evaporimeter, condenser and capillary.Compressor is as its indication, and the compression cooling fluid increases its pressure and temperature thereof, makes fluid aspirated and promotes and in cooling circuit, flow.
After leaving compressor, cooling fluid cycles through the condenser of being responsible for reducing fluid temperature (F.T.) and not reducing its pressure.Condenser is generally long duct, and this long duct is arranged to have in the end and passes through to wriggle or the interconnective straight line parallel part of sweep, and shape is roughly serpentine.Therefore, because this condenser contacts with environment, when cooling fluid circulation time in condenser is distributed to environment with heat, its temperature is minimized.
Therefore cooling fluid flows to capillary from condenser, is also referred to as expansion valve, and its function is to form the resistance that convection cell passes through, and causes fluid and the big pressure differential between the fluid in next assembly in condenser, and next assembly is an evaporimeter, and wherein pressure is low.Therefore, because poor between low pressure and the high pressure in the capillary in the evaporimeter, the high fluid resistance, cooling fluid experiences sudden change when it flows to evaporimeter, and its volume expands suddenly and is inserted in the environment under low pressure.Therefore, consider the close relation between temperature, pressure and the volume value, can sum up: increase and the pressure reduction like fruit volume, the temperature of cooling fluid also reduces, and is of value to absorbing the amount of heat that contacts with said evaporimeter.
At last, the cooling fluid that is in this expanding volume, low pressure and low temperature situation flows to compressor from evaporimeter, and its volume is reduced and its pressure and temperature increase in compressor, restarts kind of refrigeration cycle.
The canonical system of above example can be used on domestic refrigerator, air-conditioning, commercial refrigerator, product introduction refrigerator-freezer and any need refrigeration or have in the device of refrigerating function.
Described refrigeration system, we get back on the problem how to control, diagnose or handle its operation at present.In this, it is to be noted really existing a kind of system and method for controlling temperature in refrigeration and the heating of prior art, but a kind of tracing trouble and the therefore system or the method for the prevention significant trouble that can in this system, take place are not provided.
Therefore, for the diagnosis of refrigeration system, can be in all fairness, for said system suitably works, refrigeration system and assembly thereof (fan, anti-thawing apparatus, stop valve, compressor or the like) need different steadiness characteristics.But these characteristics can become according to the residing environment of refrigeration system, consider that each environment all has time-varying particular characteristics, for example: humidity, dust and ventilation.In addition, other factors can change the steadiness characteristic of assembly, comprise that service condition, wearing and tearing and assembly are aging.That is, in the service life scope, assembly and any physical unit are because environment or service condition and all through frayed and change ability to work.
Therefore, the aging fault that can cause these devices of service condition, wearing and tearing and assembly, it is reflected on the efficient of refrigeration system.These faults can be divided into two groups: (i) entirely ineffective; And (ii) slight deviations.
Under entirely ineffective situation, the defectiveness element of system can show as irregular or intermittently operated perhaps can be invalid fully, endangers whole kind of refrigeration cycle.Therefore, the fault of this value can be brought massive losses, at first is because the element connected in series of typical refrigerating circuit is arranged, promptly a defective unit can make System Operation paralyse.
Secondly, the user can only notice the deviation in the kind of refrigeration cycle after the long-time past because system has very big time constant, and the loss that is caused by the generation of this kind fault is because the slow process of Fault Identification in some cases.In the case, when defective was not detected, even system is still working, this system incited somebody to action no longer normal running and will make the assembly overload, reduces their service life greatly.In many cases, the loss that is caused by the damage refrigeration load can surpass the cost of safeguarding refrigeration system.
On the other hand, be the variation that can occur because fault is mistaken as easily by the system that environment temperature and/or heat load change cause, so when having slight deviations in the operation, the process of identification defectiveness element even slower and more difficult.Therefore, when this fault finally was identified, unfortunately, the time of the system failure possibly enough endangered one or multicompartment or or even by the load of being freezed more.Except these complex situations, in most of the cases the process of defect recognition is rule of thumb carried out, based on attendant's previous experience.
In addition, some breakdown of refrigeration system be cause by the improper operation of user and by the people around this refrigeration system or even ignore with the interactional people of improper mode with this refrigeration system and to use identification to cause.
Yet, when the notion of refrigeration system is extrapolated to when being used for diagnostic purpose and considering household electrical appliance commonly used, fault of the same type and also can take place about the difficulty of these Fault Identification.
In this article; Up to the present; Still unexposed any such diagnostic system of prior art or method, promptly this diagnostic system or method can be through using inner value of detection refrigeration system or household electrical appliance and expression environment or being detected the fault in refrigeration system component or the household electrical appliance commonly used by both devices of the value of the characteristic of refrigeration load, under the situation of refrigeration system; This system or method need preventive maintenance to user's warning, thus the minimization device downtime.
Because this gap in the prior art; Compressor or other spinner members that does not also have now a refrigeration system through a kind of can detection failure and use diagnostic system or the method for the device that detects the inside and outside value of compressor and diagnosed, thereby need preventive maintenance to user's warning.
Summary of the invention
Therefore, first purpose of the present invention is to provide a kind of diagnostic method, and it can limit the required step of diagnosis of the working condition of carrying out refrigeration system or household electrical appliance.
Second purpose of the present invention is to provide a kind of diagnostic system that is used for refrigeration system or household electrical appliance, and this diagnostic system can detect the specific fault relevant with each monitored assembly.At last, the 3rd purpose of the present invention is to provide a kind of refrigeration system compressor, the diagnosis of this compressor before diagnostic system and/or the diagnostic method quoted in the paragraph limit.
First purpose of the present invention realizes that through a kind of diagnostic method that is used for refrigeration system or household electrical appliance this diagnostic method comprises step:
(i) detection signal wherein, comes from refrigeration system and to be detected near the vibrating machine ripple signal or the sound pressure signal of the environment of this system or electrical equipment;
(ii) generate the spectrum signature (spectralsignature) of detected vibration parameters in the step (i);
(iii) assess the operating conditions of the assembly of this refrigeration system or household electrical appliance: wherein, compare with the spectrum signature of the normal running situation that relates to this refrigeration system or household electrical appliance at the spectrum signature that step generates in (ii);
(iv) new record more: the operating conditions of the refrigeration system of being assessed in (iii) in step or the assembly of household electrical appliance is deposited in the database; And
(v) operating conditions warning/signalling: wherein, processed visual by the operating conditions assessed in (iii) in step.
Second purpose of the present invention realizes that through a kind of diagnostic system that is used for refrigeration system or household electrical appliance commonly used this system comprises at least:
-sensor, said sensor can detect refrigeration system component and the mechanical oscillation or the acoustic pressure wave of surrounding environment or household electrical appliance and surrounding environment thereof thereof as a whole; And
-digital processing element, said digital processing element receive the parameter that is obtained by sensor and can discern the spectrum mode of the signal that receives from sensor.
Diagnostic system is confirmed operating conditions through spectrum mode that relatively identifies and the spectrum mode that is stored in the memory cell before.
The 3rd purpose of the present invention realizes that through refrigeration system compressor the diagnosis of this compressor uses the diagnostic system of first and second purposes and/or method to make.
Description of drawings
Below will specify the present invention based on the accompanying drawing illustrated embodiment.Accompanying drawing shows:
Fig. 1-, comprise preferred implementation and optional embodiment according to the sketch map of diagnostic system of the present invention; And
Fig. 2-according to the flow chart of diagnostic method of the present invention.
The specific embodiment
Before beginning descriptive system and method self thereof, theme of the present invention related each conception of species and characteristic at first will be described, be divided into following theme.
Refrigeration system and household electrical appliance
Operating conditions can be used for different refrigeration purposes by the refrigeration system of method and system diagnosis of the present invention, for example: commercial refrigerator, domestic refrigerator, refrigerator-freezer, air-conditioning or the like.Method and system of the present invention also can be used for other possibility purposes outside institute's example.
Preferably with conceptive ground, the refrigeration system that diagnosed is defined as the system that comprises basic cooling module, just: compressor, condenser, expansion gear and evaporimeter, and the same prior art of their operation.
In addition, the present invention has also considered the diagnosis household electrical appliance and has been not only the possibility of the operating conditions of refrigeration system in its diagnostic system and method.Household electrical appliance can be any electrical equipment known in the art that can be diagnosed by diagnostic method of the present invention and/or diagnostic system.
Value and sensor
For the operation of diagnostic system of the present invention and method, need to measure some values.
Therefore, in refrigeration system or household electrical appliance, in the middle of related some magnitudes of physical quantity, preferably will can be divided into two groups with those values in the system and method for the present invention, just:
(i) the mechanical wave signal or the acoustic pressure wave of the surrounding environment of the assembly of refrigeration system or this refrigeration system as a whole and/or household electrical appliance and refrigeration system and/or household electrical appliance; And
(ii) refrigeration system and, or the parameter of household electrical appliance by the parameter of the environment that freezed.Be described below, first group more important when confirming the operating conditions of system, and second group be used to strengthen or confirm based on first group of analysis of being done.
More specifically, the value of group (i) is the mechanical oscillation of the assembly of refrigeration system and/or household electrical appliance, and the fact that vibration is to be associated with at least one compressor or other spinner members that can incorporate refrigeration system into by assembly causes.This group further comprises the noise that is moved and produced by people in refrigeration system and/or the household electrical appliance surrounding environment.
Group value (ii) is preferably but is not limited to following value: external temperature; Under the situation of refrigeration system, the temperature of the environment that is freezed; The voltage and current of the assembly of refrigeration system and/or household electrical appliance.
Therefore,, need a plurality of sensors, make that system and method for the present invention can be based on the data diagnosis refrigeration system of collecting to detect all these parameters owing to need to measure above-mentioned value.
Therefore; At least one sensor 2 or a plurality of sensor 2 are responsible for the value of test set (i); Promptly; Be responsible for detecting the mechanical wave signal (also can be called as mechanical oscillation or acoustic pressure wave) of refrigeration system component, refrigeration system as a whole and/or household electrical appliance; Sensor 2 preferably includes: accelerometer, loudspeaker or audio sensor, and the aforementioned mechanical oscillation or the acoustic pressure wave of this loudspeaker or audio sensor ability detection components, or even can detect noise by people's generation of circulation in refrigeration system and/or household electrical appliance surrounding environment or existence.But; Can use the combination in any of said preferred implementation; That is, accelerometer, loudspeaker or audio sensor can use separately, and perhaps accelerometer can use or loudspeaker can use or the like with one or more audio sensors with one or more loudspeakers.Therefore, the combination of these sensors obviously is not the limiting factor of the scope of the invention.
A plurality of responsible test set (ii) second sensor 3 of value preferably include: at least one measures the temperature sensor of the internal temperature of refrigeration system (if words applicatory, and household electrical appliance); At least one measures the temperature sensor of the temperature of refrigeration system and/or household electrical appliance outside; And voltage and current sensor.
Preferably, said a plurality of first sensor 2 comprises that at least one detects the loudspeaker that the people moves in refrigeration system and/or household electrical appliance surrounding environment and detects refrigeration system and/or the mechanical oscillation of household electrical appliance or the loudspeaker of pressure wave.
These a plurality of first and second sensors 2,3 can be placed in the diverse location of refrigeration system and/or household electrical appliance according to the value that will detect.In this respect,, detect the loudspeaker of people's existence in refrigeration system and/or the household electrical appliance surrounding environment, for example should place the position that to detect near the noise signal that has the people to exist the expression and circulate for said a plurality of first sensors 2.Refrigeration system to be associated with commercial refrigerator (usually with being used to display goods at the supermarket and also) is an example, and in question said loudspeaker can be placed on the front portion of refrigerator, because this is the position of most probable near the people.
Under the situation of refrigeration system, external temperature sensor preferably is placed in the outside of refrigeration system usually, and internal temperature sensor is placed in the position that can detect the temperature in the load area that is freezed.In addition, for said a plurality of second sensors 3, the voltage and current sensor need be placed on the position near assembly, can produce improving or affirmation of diagnosis thus, is described below.
Spectrum signature
Diagnostic system of the present invention and method are used spectrum signature, make the operating conditions of refrigeration system to be determined and user or the personnel that are responsible for safeguarding can obtain reporting to the police.
Spectrum signature may be defined as the conversion that the time-based behavior of assembly changes into the value in the frequency domain, and in other words, spectrum signature equals the frequency spectrum of vibrating elements (motor, compressor or the like).Under situation of the present invention; Spectrum signature is preferably generated by said a plurality of first sensors 2; These first sensor 2 intentions detect the mechanical oscillation or the acoustic pressure wave of refrigeration system and/or household electrical appliance; Also intention detects the noise of refrigeration system and/or household electrical appliance surrounding environment, and promptly spectrum signature is generated by mechanical wave signal (vibration and sound).Therefore, the value of being discussed is at first detected by their sensors separately, then generated frequency spectral line, i.e. spectrum signature after application specific algorithms.Preferably, this special algorithm is Fourier transform (FFT) type.
Therefore; The assembly of considering the refrigeration system that is in the normal running situation is to confirm frequency vibration and to have definite amplitude (the two is all through its spectrum signature identification); Even minimum vibration all will change common frequency of this assembly and amplitude and this assembly and will begin to vibrate with other frequencies and amplitude in the operation, promptly be in the abnormal operation situation.
If we with motor or even compressor be example, this can be observed.In the case, when compressor vibrated under the normal running situation, it can produce the noise that can hear of CF and amplitude, but the sound of noise changes when motor for example breaks down.In other words, if sound constitutes by a series of frequencies with the amplitude of said frequency dependence, because frequency of oscillation changes with relevant amplitude, so the sound of the change of this fault motor indicates the change of its normal running situation automatically.
Based on this reason, the change of operating conditions can detect through the spectrum signature that obtains under the normal running situation is compared with the spectrum signature that generates from nearest detected vibration.Therefore, the system as a whole that is associated with said a plurality of first sensors 2 and/or the operating conditions of household electrical appliance or its assembly are by monitoring in time.
Similarly; In people's in detecting refrigeration system and/or household electrical appliance surrounding environment the situation; The noise that records is switched to frequency domain; Thereby make the frequency mode of the noise relevant generate, when this pattern changes, through the clear reading of the spectrum signature of standard of comparison situation with the spectrum signature ability acquisition behavior variation that generates from the mechanical oscillation that record sound recently with people's quantity.
Operator scheme
For the system diagnostics that will confirm, as stated, the standard frequency spectrum characteristic of system need compare with the spectrum signature that generates from current operating conditions.For this reason, method and system of the present invention depends on the standard frequency spectrum characteristic that is stored in the database.What be further noted that is that system and method for the present invention can use the spectrum signature scope relevant with operating conditions or make diagnosis at interval.In this case, do comparison between the characteristic range that will in characteristic that generates and database, store.In addition, above-mentioned database might have the series of standards value, is used for the parameter that does not generate spectrum signature (just: electric current, voltage and temperature), i.e. non-vibration signal.Therefore, can between for example normal voltage and reading voltage, do comparison to improve or to confirm through comparing the diagnostic result that spectrum signature was obtained.System and method of the present invention has also considered to be the possibility of an above mode of vibration storage operation pattern.Conceptive, mode of vibration is the level of system and/or the vibration of its assembly, and promptly assembly is set at the level of this vibration.For example, set be operated in 0 or the compressor of 3600rpm comprise two mode of vibrations, just: 0 and 3600rpm.On the other hand, speed changeable compressor is because the changeability of its rotation can comprise diversified mode of vibration.
Therefore, spectrum signature and the operating conditions pattern of each mode of vibration that database storage has corresponding to assembly or system, that is, each mode of operation is for the given specific spectrum signature of associative operation situation generation.
In the case; With only doing comparison limiting between same mode of vibration or the characteristic relevant with this same mode of vibration; That is, if the characteristic that generates is based on the 3600rpm reading of vibration down, the characteristic of this generation will be done comparison with the standard frequency spectrum characteristic of the operating conditions of identical rotation.
Preferably, the assembly of refrigeration system has at least two modes of operation, and if words applicatory, can have plural mode of operation, that's how things stand for speed changeable compressor.
Service recorder
When diagnostic system and method detected the parameter that obtains through a plurality of first and second sensors and vibrate, the data relevant with these continuous-readings were stored in the aforesaid database.These data comprise the date and time of reading, just checked assembly and corresponding operating conditions thereof, thus make service recorder be created.
This service recorder comprises each data measured, might tracking system and/or household electrical appliance and assembly operating conditions in time thereof thereby make.Therefore; Just in case refrigeration system and/or household electrical appliance meet with the fault of slight deviations type; Said fault will be to be detected easily; Because user or the personnel that are responsible for safeguarding will often notice that system demonstrates slight variation on its operation behavior, therefore got rid of and thought slight deviations by mistake to be because the possibility of the minor variations of the operating conditions that environmental change causes.
In fact; When analyzing service recorder, can eliminate this obscures; Because the behavioural trend of the magnitude of physical quantity of refrigeration system and/or household electrical appliance is in the variation that conforms (for example variations in temperature) and after one period short time, get back to balance; And under the situation of failure of removal, they trend towards in one period longer time, remaining on the operating conditions of abnormal operation situation.
Report to the police and signal
Relatively intact spectrum signature (and if words applicatory, other can not generate the value of spectrum signature) afterwards, system and method for the present invention needs can be to user or the personnel that are responsible for the safeguarding possible fault of reporting to the police.Therefore, system and method for the present invention has warning interface 6, shown in its name, departs from the early warning of normal running situation for about system the user.
Preferably, warning interface 6 comprises display and/or the terminal that at least one is connected with portable reading device, therefore makes operating conditions to see.
Therefore, life cycle ground is diagnosed the operating conditions of refrigeration system and/or household electrical appliance and is notified the system and method for the present invention of these situations of user, can stop the damage to they corresponding assemblies at an easy rate.
Diagnostic system
Since described the assembly and some characteristics of diagnostic system, also should describe the interaction between the element that forms said system.Therefore, can see that diagnostic system 1 of the present invention comprises: a plurality of first sensors 2, a plurality of second sensors 3, digital processing element 4, at least one memory cell 5 and warning interface 6 from Fig. 1.Be to be noted that and consider that said a plurality of second sensor 3 is optional for realization of the present invention, therefore, Fig. 1 illustrates the preferred implementation of diagnostic system of the present invention, in conjunction with optional embodiment.
As previously mentioned, said a plurality of first sensors 2 detect the mechanical oscillation relevant value inside and outside with refrigeration system, collect the parameter about personnel movement and refrigeration system vibration.
In the optional embodiment of this diagnostic system, said a plurality of second sensors 3 detect the value that will support and improve the diagnosis that obtains based on mechanical oscillation.
To be transferred to by said a plurality of first and second sensors, 2,3 detected values and to be responsible for converting the information reading into parameter so that obtain the digital processing element 4 of diagnosis.Contact between sensor and the said digital processing element 4 can be set up through electric wire and cable; If perhaps designer and those skilled in the art's preference; Can set up through wireless technology; And to point out that importantly data transmission device is not the factor that limits the scope of the invention, therefore can use other devices, form and method.
Therefore; For the refrigeration system diagnosis that will make; Digital processing element 4 is set as the spectrum signature of generation from the parameter of said a plurality of first sensors 2 acquisitions; That is, from the signal of receiving from least one sensor, discern frequency spectrum parameter, with the characteristic that generates and the standard frequency spectrum characteristic compares and in memory cell 5 databases, import service recorder.
Through at the spectrum signature that generates recently and be stored in the database, can detect the fault whether refrigeration system has entirely ineffective type immediately, if for example assembly is complete when invalid corresponding to the comparison between those spectrum signatures of normal running situation.
On the other hand, just in case the component table of refrigeration system reveals the discontinuous operation behavior, process can see the time when service recorder, it will indicate this fault, because irregular being identified of system or the activity in time of one or more assembly.In like manner be applicable to the slight deviations in the operating conditions, like what discussed.
In the optional embodiment, except the diagnosis of making through the comparison spectrum signature, diagnostic system of the present invention has been considered the possibility that other can assist the value of confirming operating conditions, and said back work is as the side information of confirming purpose.For example, be in invalid situation fully, can use electric current, voltage, temperature or other values that does not generate spectrum signature whether invalid really with checking and affirmation assembly just in case assembly comes to light.In fact, be read but the value that can not generate spectrum signature based on the predetermined value of storage in the memory cell 5 and decipher or not decipher.
What be further noted that is that this digital processing element 4 links to each other with warning interface 6, makes the data relevant with the operating conditions of refrigeration system process the acquisition back and just can see immediately through said interface 6.
Diagnostic method
More specifically, diagnostic system of the present invention comes to the user information about refrigeration system and/or household electrical appliance to be provided through diagnostic method, and this diagnostic method is differentiated the action that diagnostic system is carried out through its step.
Step (i) input
According to this method, its flowchart illustrations is in Fig. 2, and the first step is an input, comprises mechanical wave signal, vibration signal or the sound pressure signal of detection from refrigeration system and/or household electrical appliance.In the optional embodiment, this step can comprise the non-vibration signal of detection and system and/or household electrical appliance parameter correlation.
Physically; Said mechanical wave signal is corresponding to the mechanical wave of the structure-borne of passing through air or refrigeration system and/or household electrical appliance; That is, they comprise with the refrigeration system surrounding environment in the relevant signal of the noise that produces of people and the signal of being correlated with the mechanical oscillation of system and assembly thereof.And then the non-vibration signal is corresponding to not relevant with the mechanical oscillation parameter with the diagnosis refrigeration system that measures, for example temperature, voltage and current, and the refrigeration system that relates to as a whole relates to or its one or more assemblies.
Relation between step (i) and the diagnostic system
Signal detection step is carried out by a plurality of first and second sensors 2,3.The mechanical wave signal is detected by a plurality of first sensors 2, and the non-vibration signal is detected by a plurality of second sensors 3.After the detection, as previously mentioned, these signals are transferred to digital processing element 4 immediately.
Step (ii)-generate spectrum signature
After the Data Detection, comprise the step of the spectrum signature that generates the mechanical wave signal according to diagnostic method of the present invention.In this step, with take place in the diagnostic system similar, detected signal is converted into frequency domain so that generate its spectrum signature then.
Step (ii) and the relation between the diagnostic system
The spectrum signature of second step of this method algorithm through the fast Fourier transform (FFT) type in the digital processing element 4 of diagnostic system generates.
Step (iii)-the evaluation operation situation
In case obtain the spectrum signature of detected mechanical wave signal; This method is made assessment to the operating conditions of the assembly of refrigeration system and/or household electrical appliance; That is the spectrum signature that, step is generated in (ii) compares with standard frequency spectrum characteristic corresponding to the normal running situation of refrigeration system and/or household electrical appliance.This information will be enough to confirm whether normal running of system.But in order to increase the reliability of the diagnosis that the inventive method provides, this step (ii) further comprises the decipher of the value of non-vibration signal representative.Therefore, about the conclusion of vibration signal will be by checking, strengthen and the reliability of the diagnosis that guarantees to provide.
With take place in the diagnostic system similar, this decipher can be based on predetermined value through relatively making or not making.
Just in case system has different mode of vibrations, the spectrum signature of generation will be done comparison with the standard frequency spectrum characteristic that relates to detected mode of vibration, therefore guarantee to obtain the diagnosis to identical mode of vibration.
Step (iii) and the relation between the diagnostic system
Being evaluated in the digital processing element 4 of operating conditions made with the spectrum signature relevant with the normal running situation in being stored in memory cell 5 databases before through the spectrum signature that relatively generates.In addition, digital processing element 4 is the cohesion of checking and the parameter of non-vibration signal correction further, based on predetermined value or the setting of setting up before and decipher.Therefore, the diagnosis that is produced by spectrum signature is confirmed by the non-vibration value.
Step (iv)-record upgrades
In case discerned and confirmed assembly and the result system as a whole and/or the operating conditions of household electrical appliance; This method advances to step (iv); This step comprises the renewal service recorder, and promptly the value of the non-vibration signal that obtains in operating conditions and the step (i) of refrigeration system component of assessment in (iii) of step is deposited in the database.
Therefore, along with the establishment of service recorder, tracking system cooling system and/or household electrical appliance operating conditions are possible over time.Therefore, conform and change the required time if the time period that the frequency of assembly and amplitude keep changing exceeds them, can conclude or authentication system in have fault.
Step (iv) and the relation between the diagnostic system
The record that step is generated by digital processing element 4 in (iv) is stored in memory cell 5 databases.
Step (v)-operating conditions warning/signalling:
In case record upgrades, user or the personnel that are responsible for safeguarding need be by the notifying operation situations, and it is any unusual to make that contingency takes place, and can adopt appropriate measures to address this problem.Therefore, the (iii) middle operating conditions that obtains of step is processed visual.
Step (v) and the relation between the diagnostic system
The operating conditions of diagnostic system is reported to the police and the signalling step is carried out by warning interface 6, and as previously mentioned, warning interface 6 can be display or the terminal that is connected with portable reading device.
Compressor
Outside diagnostic system and method, the invention further relates to a kind of compressor, it is as the assembly of refrigeration system, and its diagnosis is through being determined according to diagnostic system of the present invention and method.
This compressor can be can embodiment of the present invention diagnostic system and any conventional compressor of method.
Described the example of preferred implementation, be understood that scope of the present invention comprises that other possible changes also only are subject to the content of accompanying Claim, comprise possible equivalent at this.
Claims (9)
1. a diagnostic method is used for refrigeration system or household electrical appliance, it is characterized in that comprising step:
(i) detect said refrigeration system or household electrical appliance mechanical wave signal and near the signal of the mechanical wave of the environment of this refrigeration system or household electrical appliance, said mechanical wave comprises the mechanical oscillation of said refrigeration system or household electrical appliance surrounding environment;
(ii) be created on the spectrum signature of the signal of detected mechanical wave in the step (i);
(iii) assess the operating conditions of the assembly in said refrigeration system or the household electrical appliance, wherein, the (ii) middle said spectrum signature that generates of step is compared with the spectrum signature relevant with the normal running situation of said refrigeration system or household electrical appliance;
Wherein, the (iii) middle said refrigeration system of assessing of step or the operating conditions of the assembly in the household electrical appliance are deposited in the database, and process visual through the warning interface.
2. diagnostic method according to claim 1; It is characterized in that said mechanical wave comprises the mechanical oscillation of the mechanical oscillation of the assembly in the said refrigeration system, refrigeration system as a whole or the mechanical oscillation of the said household electrical appliance in said refrigeration system or the household electrical appliance.
3. diagnostic method according to claim 1 is characterized in that, for the different oscillation modes of the signal of the mechanical wave of said refrigeration system or household electrical appliance, a plurality of spectrum signatures relevant with the normal running situation of database storage.
4. diagnostic method according to claim 3; It is characterized in that; Step (iii) in; The said spectrum signature under the different oscillation modes that generate and the spectrum signature of a plurality of normal running situations are done comparison, and the said spectrum signature of these a plurality of normal running situations is relevant with the oscillation mode identical with the spectrum signature that generates.
5. a diagnostic system is used for refrigeration system or household electrical appliance, it is characterized in that comprising:
At least one sensor (2), said sensor can detect the signal of the mechanical wave of as a whole said refrigeration system and surrounding environment thereof, or detect the signal of the mechanical wave of said household electrical appliance and surrounding environment thereof; And
Digital processing element (4), said digital processing element receive the parameter that is obtained by said sensor (2) and can from the signal that said sensor is accepted, identify spectrum mode,
It is characterized in that said digital processing element (4) compares the current operating conditions of discerning said refrigeration system or household electrical appliance through the spectrum mode with said signal with the preset mode that is stored in the memory cell (5),
Wherein, the record of the operating conditions of said memory cell (5) said refrigeration system of storage or household electrical appliance is also discerned its behavior pattern in time, and
Be provided with warning interface (6), it comprises the terminal that is used to connect reading device.
6. diagnostic system according to claim 5 is characterized in that, said sensor (2) comprises accelerometer, loudspeaker and audio sensor.
7. diagnostic system according to claim 5 is characterized in that, said terminal is at least one display.
8. a diagnostic method that is used for refrigeration system compressor is characterized in that, this diagnostic method is each described diagnostic method in the claim 1 to 4.
9. a diagnostic system that is used for refrigeration system compressor is characterized in that, this diagnostic system is each described diagnostic system in the claim 5 to 7.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0702369-3 | 2007-05-29 | ||
BRPI0702369-3A BRPI0702369A2 (en) | 2007-05-29 | 2007-05-29 | Diagnostic system and method by capturing mechanical waves in refrigeration and / or household appliances |
BRPI07023693 | 2007-05-29 | ||
PCT/BR2008/000146 WO2008144864A1 (en) | 2007-05-29 | 2008-05-20 | System and method of diagnosis through detection of mechanical waves in refrigeration systems and/or household appliances |
Publications (2)
Publication Number | Publication Date |
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CN101680693A CN101680693A (en) | 2010-03-24 |
CN101680693B true CN101680693B (en) | 2012-06-27 |
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Family Applications (1)
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CN2008800181279A Expired - Fee Related CN101680693B (en) | 2007-05-29 | 2008-05-20 | System and method of diagnosis through detection of mechanical waves in refrigeration systems and/or household appliances |
Country Status (9)
Country | Link |
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US (1) | US20100269522A1 (en) |
EP (1) | EP2153141A1 (en) |
JP (1) | JP2010532021A (en) |
KR (1) | KR20100031696A (en) |
CN (1) | CN101680693B (en) |
AR (1) | AR066058A1 (en) |
BR (1) | BRPI0702369A2 (en) |
MX (1) | MX2009012604A (en) |
WO (1) | WO2008144864A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
EP2153141A1 (en) | 2010-02-17 |
US20100269522A1 (en) | 2010-10-28 |
BRPI0702369A2 (en) | 2009-01-20 |
WO2008144864A1 (en) | 2008-12-04 |
MX2009012604A (en) | 2009-12-11 |
JP2010532021A (en) | 2010-09-30 |
AR066058A1 (en) | 2009-07-22 |
CN101680693A (en) | 2010-03-24 |
KR20100031696A (en) | 2010-03-24 |
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