CN101504178A - Substitution control method for air conditioner fault sensor - Google Patents
Substitution control method for air conditioner fault sensor Download PDFInfo
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- CN101504178A CN101504178A CNA2009100196054A CN200910019605A CN101504178A CN 101504178 A CN101504178 A CN 101504178A CN A2009100196054 A CNA2009100196054 A CN A2009100196054A CN 200910019605 A CN200910019605 A CN 200910019605A CN 101504178 A CN101504178 A CN 101504178A
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Abstract
The invention discloses a substitution and control method for a fault sensor of an air conditioner, which is suitable for a coil pipe temperature sensor and a defrosting temperature sensor for respectively detecting the saturation temperature of a condenser and the whether the condenser is defrosting or not in an outdoor unit of the air conditioner. When the coil pipe temperature sensor has fault, the detecting value of the defrosting temperature sensor substitutes the detecting value of the coil pipe temperature sensor by a correcting method, and participates in the control and calculation of a main control program; and when the defrosting temperature sensor has fault, the detecting value of the coil pipe temperature sensor substitutes the detecting value of the defrosting temperature sensor by the correcting method, and participates in the control and calculation of the main control program, thereby ensuring that the unit can continuously run while reporting the error and waiting for maintenance, further avoiding the inconvenience brought to users caused by disorderly closedown and improving the service comfort of products.
Description
Technical field
The invention belongs to air-conditioning and Refrigeration Engineering technical field, specifically, relate to adopt a kind of alternative to guarantee a kind of alternative control method of air-conditioner continuous service when a kind of certain sensor in air-conditioner breaks down.
Background technology
Air-conditioner, multi-split air conditioner particularly, when operation its primary control program need utilize the parameter value that is distributed in the temperature sensor measurement at each control point in the refrigeration system to participate in control to calculate or judge, thereby according to calculating or judged result realizes control to parts such as compressor, electric expansion valve, blower fans.If certain sensor breaks down, primary control program will be judged, calculate because of lacking necessary temperature parameter value, thereby can not move control normally.When this thing happens, present air-conditioner often adopted to shut down and reports an error, waits for that the mode of maintenance handles, thereby has influenced user's normal use.
Summary of the invention
The present invention is in order to solve existing air-conditioner adopts shutdown to report an error problem that processing mode impacts user's daily use when sensor breaks down; a kind of alternative control method of air conditioner fault sensor has been proposed; when a certain sensor breaks down; main control module can utilize the data of other sensor measurements participating in control calculating through revising the measured value that replaced fault sensor afterwards temporarily, thereby guarantees that air-conditioner can continuous service.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of alternative control method of air conditioner fault sensor, be provided with condenser in air-conditioner outdoor unit, described condenser is provided with and is used to measure the coil temperature sensor of condenser saturation temperature and to the condenser defrosting temperature sensor whether frosting detects; Described coil temperature sensor adopts the detected value of described defrosting temperature sensor to participate in the control computing through revising the detected value that substitutes described coil temperature sensor afterwards, to keep the air-conditioner continuous service when breaking down.
Further, the detected value of described defrosting temperature sensor is the temperature value that the position of this defrosting temperature sensor is set on the condenser, is designated as Tdef; Described coil temperature sensor utilizes the result of calculation Tcoil of formula Tcoil=Tdef+ Δ t to substitute the detected value of described coil temperature sensor when breaking down, i.e. the saturation temperature value of condenser constantly, and the substitution primary control program participates in computing; Wherein, described Δ t is a correction value.
Further again, when described correction value Δ t normally moved according to air-conditioner, the difference between the detected value of described coil temperature sensor and defrosting temperature sensor was specifically determined.
In general, when air-conditioner operated in refrigeration mode, described correction value Δ t is value in 3 ℃～10 ℃ scopes; When air-conditioner operated in heating mode, described correction value Δ t is value in-3 ℃～5 ℃ scopes.
Further again, described air-conditioner receives the detected value of described coil temperature sensor and the output of defrosting temperature sensor by its inner main control module, when the detected value of the coil temperature sensor that receives is zero or when infinitely great, think that described coil temperature sensor breaks down.
Technique scheme has been set forth a kind of alternative control mode when coil temperature sensor breaks down.In addition, the invention allows for a kind of alternative control method when the defrosting temperature sensor breaks down, promptly when the defrosting temperature sensor breaks down, adopt the detected value of coil temperature sensor to participate in the control computing, to keep the air-conditioner continuous service through revising the detected value that substitutes described defrosting temperature sensor afterwards.
Further, the detected value of described coil temperature sensor is the saturation temperature value of this moment condenser, is designated as Tcoil; Described defrosting temperature sensor is when breaking down, utilize the result of calculation Tdef of formula Tdef=Tcoil+ Δ t to substitute the detected value of described defrosting temperature sensor, be the temperature value that the position of this defrosting temperature sensor is set on the condenser, the substitution primary control program participates in computing; Wherein, described Δ t is a correction value.
Further again, when described correction value Δ t normally moved according to air-conditioner, the difference between the detected value of described defrosting temperature sensor and coil temperature sensor was determined.
In general, when air-conditioner operated in refrigeration mode, described correction value Δ t is value in-10 ℃～3 ℃ scopes; When air-conditioner operated in heating mode, described correction value Δ t is value in 3 ℃～-5 ℃ scopes.
Further, described air-conditioner receives the detected value of described coil temperature sensor and the output of defrosting temperature sensor by its inner main control module, when the detected value of the defrosting temperature sensor that receives is zero or when infinitely great, think that described defrosting temperature sensor breaks down.
Compared with prior art; advantage of the present invention and good effect are: when disclosed air-conditioner breaks down at a certain sensor; main control module is when externally reporting an error; the data that can temporarily utilize other respective sensor to measure are being calculated through revising the measured value participation control that replaced fault sensor afterwards; thereby make unit in the wait maintenance that reports an error; can not shut down and continue operation; and then avoided disorderly closedown to the inconvenience that the user brings, improved the comfortableness that product uses.
After reading the detailed description of embodiment of the present invention in conjunction with the accompanying drawings, other characteristics of the present invention and advantage will become clearer.
Description of drawings
Fig. 1 is the program flow diagram that coil temperature sensor substitutes a kind of embodiment of control method;
Fig. 2 is the program flow diagram that the defrosting temperature sensor substitutes a kind of embodiment of control method.
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is done explanation in further detail.
The present invention is in order to make air-conditioner when a certain sensor breaks down, and complete machine can run without interruption, and has proposed a kind of alternative control method of fault sensor.Specifically, be a kind ofly in air-conditioner outdoor unit, to be used to measure the coil temperature sensor of condenser saturation temperature or to be used to measure condenser when the defrosting temperature sensor of frosting breaks down, the alternative control method that can temporarily take.
Present air-conditioner all includes indoor set and off-premises station two parts, is provided with condenser in air-conditioner outdoor unit, also can be called radiator, is used for the high temperature and high pressure steam of compressor output is cooled off.On described condenser, be provided with coil temperature sensor and defrosting temperature sensor usually, it is provided with the position relative fixed, is used for detecting the saturation temperature (also can be called coil temperature) and the defrosting temperature (promptly judging whether frosting of condenser according to this temperature value) of condenser respectively.When air-conditioner operated in refrigeration mode and heating mode, the coil temperature of condenser was relatively-stationary with the difference of defrosting temperature, and when refrigerating operaton, its deviation is mainly caused by degree of supercooling; And when heating operation, its deviation is mainly caused by the tube side pressure drop.Therefore, when the coil temperature sensor of condenser breaks down, can add that by the detected temperature value of defrosting temperature sensor this deviate obtains result substantially accurately temporarily; Vice versaad.
Based on above-mentioned principle, when the present invention breaks down at coil temperature sensor, the method that employing is revised the detected value of defrosting temperature sensor substitutes the detected value of described coil temperature sensor, calculates with the control that participates in primary control program, and then guarantees that air-conditioner can continuous service.Otherwise, when the defrosting temperature sensor breaks down, then adopt the method that the detected value of coil temperature sensor is revised to substitute the detected value of described defrosting temperature sensor, the control that participates in primary control program is calculated, thereby reaches the purpose that keeps air-conditioner to run without interruption.
Elaborate the specific implementation process that described fault sensor substitutes control method below by two specific embodiments.
Embodiment one, and the alternative control method when present embodiment has disclosed a kind of coil temperature sensor and breaks down promptly when the condenser coil temperature sensor breaks down, reads the detected value of the defrosting temperature sensor that is arranged on the condenser, is designated as Tdef; Tdef revises to this detected value, promptly add a correction value Δ t after, to replace the detected value of coil temperature sensor, be designated as Tcoil; And then with Tcoil, Tdef substitution primary control program participation control calculating, thereby realize the primary control program continuous service, the complete machine unit can be reached when warning is waited to repair do not shut down the operation purpose, to be user-friendly to.
Because the detected value of coil temperature sensor and the output of defrosting temperature sensor is generally analog signal, after the analog-to-digital conversion module reception by indoor set or off-premises station inside, convert corresponding with it data-signal (being temperature value) to and transfer to the computing that main control module participates in primary control program; Perhaps can be directly receive by the main control module of air-conditioner inside, through the built-in ADC of main control module be converted to the corresponding temperature data signal of this analog signal after, participate in control again and calculate.Therefore, detected value Tcoil, the Tdef that is here proposed specifically refers to the data-signal through the conversion generation, promptly concrete temperature value.For describe clear for the purpose of, be coil temperature to call Tcoil in the following text; Tdef is the defrosting temperature.When correction value Δ t normally moved according to air-conditioner, the coil temperature of condenser was specifically determined with the difference of defrosting temperature.The results showed: when air-conditioner operated in refrigeration mode, described correction value Δ t is value in 3 ℃～10 ℃ scopes; When air-conditioner operated in heating mode, described correction value Δ t is value in-3 ℃～5 ℃ scopes.
Certainly, described detected value Tcoil, Tdef also can graduated dial pipe temperature sensors and the pairing magnitude of voltage of analog signal of defrosting temperature sensor output.At this moment, when described correction value Δ t can normally move according to air-conditioner, the difference (being voltage difference) between the detected value of described coil temperature sensor and defrosting temperature sensor was specifically determined.Then, be converted to corresponding with it temperature value with detected value Tdef and through the revised parameter Tcoil of formula Tcoil=Tdef+ Δ t by main control module, the substitution primary control program participates in calculating.
Fig. 1 substitutes a kind of program flow diagram of control method for coil temperature sensor.Wherein, detected value Tcoil, Tdef represent coil temperature and defrosting temperature respectively, and Δ t specifically may further comprise the steps for revising temperature value:
S101, give variable t1, t2 with the correction value assignment of determining.Correction value when wherein, t1 is refrigerating operaton; Correction value when t2 is heating operation.
Here, described correction value is just determined input by the technical staff in the air-conditioner debug phase, prior write memory, and assignment is given variable t1, t2 when primary control program moves; Such as: t1 can be 4,5,7 or 8 equivalences, and t2 can be-2 ,-1 or 2,3,4 equivalences, specifically determines according to the actual conditions of air-conditioner.
S102, read coil temperature Tcoil.
S103, read defrosting temperature T def.
S104, judge whether coil temperature sensor breaks down; If break down, then output alarm signal, and execution subsequent step; Otherwise, jump to step S109.
Here, can adopt the detected value size that detects coil temperature sensor output to realize for the judgement whether coil temperature sensor breaks down, promptly when the detected value of coil temperature sensor output be zero or when infinitely great when opening circuit (coil temperature sensor short circuit or), think that described coil temperature sensor breaks down.
S105, the current operational mode of judgement air-conditioner are if operate in refrigeration mode, then execution in step S106; If operate in heating mode, then execution in step S107.
S106, the value assignment of variable t1 given revise variable Δ t, i.e. Δ t=t1, and jump to step S108.
S107, the value assignment of variable t2 given revise variable Δ t, i.e. Δ t=t2.
S108, the temperature T that will defrost def and correction variable Δ t substitution formula: Tcoil=Tdef+ Δ t calculates coil temperature Tcoil.
Thus, obtained the coil temperature Tcoil and the defrosting temperature T def of condenser, called, calculated, kept the air-conditioning continuous service to participate in control for primary control program.
S109, EP (end of program).
Embodiment two, and the alternative control method when present embodiment has disclosed a kind of temperature sensor that defrosts and breaks down promptly when condenser defrosting temperature sensor breaks down, reads the detected value that is arranged on the coil temperature sensor on the condenser, is designated as Tcoil; Tcoil revises to this detected value, promptly add a correction value △ t after, to replace the detected value of defrosting temperature sensor, be designated as Tdef; And then with Tcoil, Tdef substitution primary control program participation control calculating, thereby realize the primary control program continuous service, the complete machine unit can be reached when warning is waited to repair do not shut down and continue to move purpose.
As embodiment one, detected value Tcoil, Tdef both can graduated dial pipe temperature sensors and the pairing actual temp value of analog voltage signal of defrosting temperature sensor output, also can refer to the pairing magnitude of voltage of this analog voltage signal.Present embodiment still represents that with Tcoil coil temperature, the Tdef temperature of representing to defrost is that example is specifically addressed.When correction value Δ t normally moved according to air-conditioner, the defrosting temperature of condenser and the difference of coil temperature were specifically determined.The results showed: when air-conditioner operated in refrigeration mode, described correction value Δ t is value in-10 ℃～3 ℃ scopes; When air-conditioner operated in heating mode, described correction value Δ t is value in 3 ℃～-5 ℃ scopes.If with voltage value representation detected value Tcoil, Tdef, when then correction value Δ t can normally move according to air-conditioner, the difference between the detected value of described defrosting temperature sensor and coil temperature sensor (being voltage difference) was specifically determined.Then, be converted to corresponding with it temperature value with detected value Tcoil and through the revised parameter Tdef of formula Tdef=Tcoil+ Δ t by main control module, the substitution primary control program participates in calculating.
Fig. 2 can be used as a subprogram and writes main control module for a kind of program flow diagram of the alternative control method of defrosting temperature sensor, calls for main program.Wherein, detected value Tcoil, Tdef represent coil temperature and defrosting temperature respectively, specifically may further comprise the steps:
S201, give variable t3, t4 with the correction value assignment of determining.Correction value when wherein, t3 is refrigerating operaton; Correction value when t4 is heating operation.
Here, described correction value is just determined input by the technical staff in the air-conditioner debug phase, prior write memory, and assignment is given variable t3, t4 when primary control program moves; Such as: t3 can be-8 ,-6 ,-5 ,-2 or 1,2 equivalences, and t4 can be-4 ,-3 ,-2 or 1,2 equivalences, specifically determines according to the actual conditions of air-conditioner.
S202, read coil temperature Tcoil.
S203, read defrosting temperature T def.
Whether S204, judgement defrosting temperature sensor break down; If break down, then output alarm signal, and execution subsequent step; Otherwise, jump to step S209.
Here, can adopt the detected value size that detects the output of defrosting temperature sensor to realize for the judgement whether the defrosting temperature sensor breaks down, promptly when the detected value of defrosting temperature sensor output be zero or when infinitely great when opening circuit (defrost temperature sensor short circuit or), think that the defrosting temperature sensor breaks down.
S205, the current operational mode of judgement air-conditioner are if operate in refrigeration mode, then execution in step S206; If operate in heating mode, then execution in step S207.
S206, the value assignment of variable t3 given revise variable Δ t, i.e. Δ t=t3, and jump to step S208.
S207, the value assignment of variable t4 given revise variable Δ t, i.e. Δ t=t4.
S208, with coil temperature Tcoil with revise variable Δ t substitution formula: Tdef=Tcoil+ Δ t calculates defrosting temperature T def.
Thus, obtained the coil temperature Tcoil and the defrosting temperature T def of condenser, called, calculated, kept the air-conditioning continuous service to participate in control for primary control program.
S209, EP (end of program).
Disclosed fault sensor substitutes control method and is not only applicable to common air-conditioning product, same being suitable for for an one driven multiple air conditioner group and the multi-joint unit of free multi-type (VRV).
Certainly; above-mentioned explanation is not to be limitation of the present invention; the present invention also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present invention also should belong to protection scope of the present invention.
Claims (10)
1, a kind of alternative control method of air conditioner fault sensor, be provided with condenser in air-conditioner outdoor unit, described condenser is provided with and is used to measure the coil temperature sensor of condenser saturation temperature and to the condenser defrosting temperature sensor whether frosting detects; It is characterized in that: described coil temperature sensor adopts the detected value of described defrosting temperature sensor to participate in the control computing through revising the detected value that substitutes described coil temperature sensor afterwards, to keep the air-conditioner continuous service when breaking down.
2, the alternative control method of air conditioner fault sensor according to claim 1 is characterized in that: the detected value of described defrosting temperature sensor is the temperature value that the position of this defrosting temperature sensor is set on the condenser, is designated as Tdef; Described coil temperature sensor utilizes the result of calculation Tcoil of formula Tcoil=Tdef+ △ t to substitute the detected value of described coil temperature sensor when breaking down, i.e. the saturation temperature value of condenser constantly, and the substitution primary control program participates in computing; Wherein, described △ t is a correction value.
3, the alternative control method of air conditioner fault sensor according to claim 2 is characterized in that: when described correction value △ t normally moved according to air-conditioner, the difference between the detected value of described coil temperature sensor and defrosting temperature sensor was determined.
4, the alternative control method of air conditioner fault sensor according to claim 2 is characterized in that: when air-conditioner operated in refrigeration mode, described correction value △ t is value in 3 ℃～10 ℃ scopes; When air-conditioner operated in heating mode, described correction value △ t is value in-3 ℃～5 ℃ scopes.
5, according to the alternative control method of each described air conditioner fault sensor in the claim 1 to 4, it is characterized in that: described air-conditioner receives the detected value of described coil temperature sensor and the output of defrosting temperature sensor by its inner main control module, when the detected value of the coil temperature sensor that receives is zero or when infinitely great, think that described coil temperature sensor breaks down.
6, a kind of alternative control method of air conditioner fault sensor, be provided with condenser in air-conditioner outdoor unit, described condenser is provided with and is used to measure the coil temperature sensor of condenser saturation temperature and to the condenser defrosting temperature sensor whether frosting detects; It is characterized in that: described defrosting temperature sensor adopts the detected value of described coil temperature sensor to participate in the control computing through revising the detected value that substitutes described defrosting temperature sensor afterwards, to keep the air-conditioner continuous service when breaking down.
7, the alternative control method of air conditioner fault sensor according to claim 6 is characterized in that: the detected value of described coil temperature sensor is designated as Tcoil for the saturation temperature value of this moment condenser; Described defrosting temperature sensor is when breaking down, utilize the result of calculation Tdef of formula Tdef=Tcoil+ △ t to substitute the detected value of described defrosting temperature sensor, be the temperature value that the position of this defrosting temperature sensor is set on the condenser, the substitution primary control program participates in computing; Wherein, described △ t is a correction value.
8, the alternative control method of air conditioner fault sensor according to claim 7 is characterized in that: when described correction value △ t normally moved according to air-conditioner, the difference between the detected value of described defrosting temperature sensor and coil temperature sensor was determined.
9, the alternative control method of air conditioner fault sensor according to claim 7 is characterized in that: when air-conditioner operated in refrigeration mode, described correction value △ t is value in-10 ℃～3 ℃ scopes; When air-conditioner operated in heating mode, described correction value △ t is value in 3 ℃～-5 ℃ scopes.
10, according to the alternative control method of each described air conditioner fault sensor in the claim 6 to 9, it is characterized in that: described air-conditioner receives the detected value of described coil temperature sensor and the output of defrosting temperature sensor by its inner main control module, when the detected value of the defrosting temperature sensor that receives is zero or when infinitely great, think that described defrosting temperature sensor breaks down.
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