CN108193461B - Clothes drying remaining time display method and clothes dryer using same - Google Patents
Clothes drying remaining time display method and clothes dryer using same Download PDFInfo
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/30—Drying processes
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/02—Characteristics of laundry or load
- D06F2103/08—Humidity
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/38—Time, e.g. duration
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/28—Arrangements for program selection, e.g. control panels therefor; Arrangements for indicating program parameters, e.g. the selected program or its progress
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/32—Control of operations performed in domestic laundry dryers
- D06F58/34—Control of operations performed in domestic laundry dryers characterised by the purpose or target of the control
- D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
- D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
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Abstract
The invention discloses a clothes drying remaining time display method and a clothes dryer using the same, wherein the clothes dryer is provided with a temperature detection device, a timing device and a time display device, the method utilizes the linear rule that the temperature of adjacent time nodes changes along with the time in the heating stage of the clothes dryer in the clothes drying process, estimates the clothes drying remaining time by adopting the temperature change at the air outlet of the clothes dryer, and displays the time through the time display device of the clothes dryer by a countdown method. The method and the clothes dryer using the method have the advantages that the estimation on the residual time for drying clothes is accurate, the realization is simple, the problem of accurately displaying the residual time for drying clothes on the clothes dryer is solved, the requirement of a user for taking out the clothes in time is facilitated, and the use effect is good.
Description
Technical Field
The invention belongs to the field of washing and drying machines, and particularly relates to a clothes drying remaining time display method and a clothes dryer using the same.
Background
The clothes drying and stopping are already basic configuration of the clothes dryer, but the display of the remaining time is usually decreased gradually according to the set time, and the display time cannot accurately reflect the remaining time without timely adjustment according to the quantity and humidity of clothes. The user wants the dryer to display the remaining time more accurately so as to take out the laundry in time. Therefore, a method for estimating and displaying the residual drying time by using a temperature sensor is designed and researched.
Chinese patent CN 200410072481.3 discloses an "automatic drying method for washing machine" which includes the temperature detection values of the 1 st temperature sensor inside the washing machine tub and the 2 nd temperature sensor inside the drying air duct, and calculating the difference between the two temperatures. The drying system can be divided into 3 stages, the temperature in the drying system in the 1 st stage rises rapidly, the temperature detection value in the 2 nd stage rises slowly, the temperature difference value is kept unchanged, and the temperature difference value in the 3 rd stage rises rapidly. The drying degree of the clothes is judged by detecting the temperature detection value and the temperature difference value in real time, and the drying stroke and operation are determined. The invention provides an automatic drying control method, which utilizes the regular characteristics of three stages of temperature rise in the clothes drying process of the clothes dryer. The method aims to improve the judgment accuracy of the dryness of the clothes, thereby improving the control precision of the dryer, and does not disclose a method for predicting the residual drying time by using a slope algorithm.
Further, chinese patent CN 200910047294.2 discloses "an automatic drying method for a drum washing machine", which calculates a difference Δ T between a temperature T1 of a 1 st temperature sensor in an air duct and a temperature T2 of a 2 nd temperature sensor in a drum, calculates a Δ T slope when an operation time is greater than or equal to a set time 1, calculates a Δ T slope if the Δ T slope is greater than the set time 1, stops heating and enters cooling until the drying process is finished if the Δ T slope is greater than the set value 1, and stops heating and enters cooling if the T1 is greater than a limit value 2; or calculating the difference value sigma between the temperature difference value delta T and the average value delta T0, if the times n that sigma is larger than the reference value sigma 0 reach the reference value n0 or the running time is larger than the set time 2, stopping heating in the drying process, and entering cooling until the end. Although the concept of the relation between the delta T and the slope is mentioned, the drying process is mainly controlled through the slope, the rule of temperature change and the rule of time change are not combined, and the residual drying time is not judged through the slope as the method.
The present invention has been made in view of this situation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a clothes drying remaining time display method and a clothes dryer using the same, wherein the clothes dryer is provided with a temperature detection device, a timing device and a time display device, the method utilizes the linear law that the temperature of adjacent time nodes changes along with the time in the heating stage of the clothes dryer in the clothes drying process, estimates the clothes drying remaining time by adopting the temperature change at the air outlet of the clothes dryer, and displays the time by the time display device of the clothes dryer in a countdown method. The method and the clothes dryer using the method have the advantages that the estimation on the residual time for drying clothes is accurate, the realization is simple, the problem of accurately displaying the residual time for drying clothes on the clothes dryer is solved, the requirement of a user for taking out the clothes in time is facilitated, and the use effect is good.
In order to realize the purpose, the invention adopts the following technical scheme:
a clothes drying remaining time display method for a clothes dryer provided with a temperature detecting means, a time counting means and a time display means, said time display means displaying a drying process remaining time in a countdown manner, characterized by comprising the steps of:
step S1, performing system presetting, presetting a balance temperature difference change constant m for judging whether the current time is in a temperature balance stage, presetting a state jump temperature difference constant n for judging whether the current time jumps from the temperature balance stage to a temperature rise section, and presetting a drying finishing temperature threshold TjPresetting the cold air time length after drying as a time constant eta;
step S2, starting the drying process, detecting the temperature of the air outlet of the clothes dryer by the temperature detection device according to the preset time interval to obtain a temperature value Ti；
Step S3, calculating a temperature difference Δ T ═ T between two adjacent time nodesi-Ti-1；
In step S4, when |. DELTA T ≦ m, it is determined that the instant temperature T at the current moment isiThe value of (A) is the equilibrium temperature TPAt this time, the temperature is in a temperature equilibrium stage;
step S5, calculating a deviation value Delta T of the balance temperatureC＝Ti-TPAnd will be Δ TCDelta T compared to the state transition temperature difference constant nC>n, indicating that the temperature starts to enter the temperature rising interval at the moment, and recording the current inflection point time tG；
Step S6, when the drying process is in the temperature rising interval, the temperature is in anyMean time tiTime, remaining time t for drying clothesY＝(ti-tG)*[(Tj-TP)/△TC-1]+ eta and displaying t by time display meansYNumerical values.
Further, step S2 includes displaying the remaining time of the drying process in a countdown manner from the preset time length as a starting point.
Further, the preset time length is a total time length t required for drying the laundry according to a full load of the washing machine in a general case.
Further, a countdown comparison residual time t is setY', said tY' is an empirical value, 0.2t<tY’<0.3 t; when the countdown reaches tYWhen' yes, go to step S5; t is a total time period required to dry the laundry according to a full load of the washing machine in a general case,
and the number of the first and second electrodes,
if Δ TC>n, the drying process enters the temperature rising interval, and the process continues to step S6, where the time display device displays tYOtherwise, the rest time displayed by the time display device is adjusted to tY", said tY”＝tY' + ε, which is an empirical value indicating that it is expected that the time t will be from the current state to the inflection pointGThe time required.
Further, when the countdown device has not reached tY' hour, clothes dryer air outlet temperature TiHas reached a preset drying end temperature threshold TjAnd judging that the drying process is finished at the moment, starting entering a cold air stage after the drying is finished, and displaying the residual time of the drying process by using a time constant eta of the cold air as a starting point and by using a countdown mode by using the time display device at the moment.
Further, in step S3, the time interval of the neighboring time node is 4 minutes.
Further, in step S1, the preset cold air time duration time constant η after the drying is 10 minutes.
Further, in step S1, the preset equilibrium temperature difference change constant m for determining whether the current time is in the temperature equilibrium stage is 2K.
Further, in step S1, the preset state transition temperature difference constant n for determining whether the current time is from the temperature balance stage to the temperature rise section is 2K.
Also discloses a clothes dryer, and the clothes drying remaining time display method is used.
After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects.
The invention discloses a clothes drying remaining time display method, which adopts a temperature sensor arranged at an air outlet of a clothes dryer and estimates the clothes drying remaining time by utilizing the linear law that the temperature of adjacent time nodes changes along with the time in the temperature rise stage of the clothes dryer in the clothes drying process. The clothes dryer solves the problem that the drying residual time is accurately displayed on the clothes dryer, and is convenient for a user to take out clothes in time.
A large amount of experimental data prove that under the condition of not considering the cold air time, the clothes need to be dried through three stages of temperature rise: the initial temperature continuously rises, the intermediate temperature equilibrates, and the final temperature rises, wherein the time and temperature in the final temperature rise phase approach a linear relationship. The invention applies the rule, combines the time countdown mechanism of the washing machine and adopts a linear estimation method, the program design is simple and easy, the result is accurate, and the estimation problem of the residual time for drying the clothes can be conveniently solved. By using the remaining time display method of the method, the user can accurately know the clothes drying condition at present, and the problem that the clothes drying display time and the actual drying progress on the washing machine on the market are not matched is solved.
In addition, the method also considers the condition that the clothes drying process of the clothes dryer is finished before the sampling time point due to the factors of small quantity of clothes, low water content and the like in the clothes drying process, and further adopts the temperature threshold value to monitor the drying state. The application situation of the method is supplemented, and the applicability of the method is increased.
In addition, a washing machine using the method is also disclosed, and the drying remaining time display method is used. The expected effect can be conveniently realized by arranging the temperature sensor at the air outlet of the clothes dryer and adding a simple operation program to the existing remaining time display processing unit, the improvement is simple and the application effect is good.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a flow chart of a method for displaying the remaining time of drying clothes according to the present invention;
FIG. 2 is a schematic diagram of experimental data distribution of temperature variation with time during drying process of a clothes dryer;
FIG. 3 is a schematic diagram illustrating the temperature variation of clothes dried by the dryer disclosed in the present invention;
FIG. 4 is a schematic view illustrating the calculation principle of the remaining time display method of the clothes dryer according to the present invention.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
The various techniques and tools described herein may be used independently. Some of the techniques and tools may be used in combination. Various techniques are described below with reference to flowcharts of processing acts. The various processing acts illustrated in the flowcharts may be combined into fewer acts or divided into more acts. For simplicity, the relationships between acts illustrated in a particular flowchart and acts described elsewhere are generally not illustrated. In many cases, the actions in the flow diagrams may be rearranged.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the method comprises the following steps: step S1, performing system presetting, presetting a balance temperature difference change constant m for judging whether the current time is in a temperature balance stage, presetting a state jump temperature difference constant n for judging whether the current time jumps from the temperature balance stage to a temperature rise section, and presetting a drying finishing temperature threshold TjPresetting the cold air time length after drying as a time constant eta; step S2, starting the drying process, detecting the temperature of the air outlet of the clothes dryer by the temperature detection device according to the preset time interval to obtain a temperature value Ti(ii) a Step S3, calculating a temperature difference Δ T ═ T between two adjacent time nodesi-Ti-1(ii) a In step S4, when |. DELTA T ≦ m, it is determined that the instant temperature T at the current moment isiThe value of (A) is the equilibrium temperature TPAt this time, the temperature is in a temperature equilibrium stage; step S5, calculating a deviation value Delta T of the balance temperatureC＝Ti-TPAnd will be Δ TCDelta T compared to the state transition temperature difference constant nC>n, indicating that the temperature starts to enter the temperature rising interval at the moment, and recording the current inflection point time tG(ii) a Step S6, when the drying process is in the temperature rising interval, at any time tiTime, remaining time t for drying clothesY＝(ti-tG)*[(Tj-TP)/△TC-1]+ eta and displaying t by time display meansYNumerical values.
The overall process of carrying out the method is described in detail below.
1. Step S1, performing system presetting, presetting a balance temperature difference change constant m for judging whether the current time is in a temperature balance stage, presetting a state jump temperature difference constant n for judging whether the current time jumps from the temperature balance stage to a temperature rise section, and presetting a drying finishing temperature threshold TjAnd presetting the cold air time after drying as a time constant eta:
as shown in fig. 1, the step 1 is mainly to perform system initialization. According to the invention, the temperature sensor is arranged at the air outlet of the clothes dryer, so that the temperature of the air outlet of the clothes dryer is detected in real time in the clothes drying process. The experimental data distribution diagram of the temperature change with time of the drying process of the clothes dryer similar to that shown in figure 2 can be obtained through repeated experiments. As can be seen from fig. 2, the temperature of the whole drying process is changed regularly. By summarizing the process of fig. 2, fig. 3, a schematic diagram of the temperature variation of the clothes dried by the clothes dryer, can be obtained.
As shown in fig. 3, the drying of the laundry generally has the following stages: three stages of temperature rise and four stages of cold air temperature reduction. As shown in fig. 3, from 0 to time t0And the stage belongs to the initial temperature rise stage. This stage belongs to the initial stage of drying, and the moisture content of clothing is higher this moment, and the temperature constantly rises along with the duration of heating time. This stage is a long time away from the drying completion, and the user usually does not care about the specific remaining time at this stage, which is not the focus of the application of the method. The embodiment mainly calculates the remaining drying time when the drying is in the temperature balance stage or the temperature rise stage after the temperature balance stage.
From t0To tGBelongs to the middle section temperature of dryingAnd in the balancing stage, the vaporization heat of the water vapor and the electric heating power are in a relatively balanced state, the heat of a heating device in the dryer is mainly absorbed by the process of vaporizing the water into the water vapor, namely the heat power is converted into the vaporization heat of the water, and the temperature detected by a temperature sensor at the air outlet of the dryer is basically unchanged.
In order to determine whether the drying process is in this stage, the method defines an equilibrium temperature difference change constant m. In this embodiment, m is 2K. In the subsequent steps, the temperature difference value of the air outlet tested in the adjacent time node is compared with the balance temperature difference change constant m, and whether the current drying state belongs to the temperature balance stage or not can be judged. Further, in step S1, a state transition temperature difference constant n is set, and an application method of the constant is to compare a difference between the instantaneous temperature and the equilibrium temperature with the difference, and the function of the constant is to determine whether the current time is to transition from the temperature equilibrium stage to the temperature rise interval, so as to provide a basis for subsequent calculation and determination. In this embodiment, n is 2K. When the temperature difference between the instant temperature and the equilibrium temperature is larger than or equal to n, the dryer enters the third stage of temperature rise, namely the final stage of temperature rise. In connection with FIG. 3, i.e. t in the figureGAnd (3) a stage of t-eta. Where t is a preset length of time, which is the total length of time required to dry the laundry at full load according to the general condition of the washing machine. This value is the average length of time used in the industry for drying the laundry, for example, 8 kg of laundry in the usual case, the total length of time t of the drying process being 2 hours and 30 minutes with a full load.
In addition, a drying end temperature threshold value T is presetj. It should be noted that the temperature in the dryer must have the highest temperature limit, because the drying process enters the end of the third phase of temperature rise, when the temperature reaches a certain limit, the drying degree of the clothes reaches the drying extreme value of the present system, and if the heating is continued, the clothes will be damaged. It is therefore necessary to set the temperature threshold TjWhen the temperature of the air outlet reaches TjWhen the heating is stopped, the heating is stopped. At the moment, the cold air blower is started to quickly reduce the temperature in the dryerSimultaneously, the damp and hot gas is blown out by utilizing the flowing air flow. Generally speaking, the temperature threshold T is reached from the dryerjThe time for taking out the clothes to the end of the cold air is corresponding to the fixed time according to different fan powers of the washing machine and other requirements, and the preset time constant η of the cold air duration after drying is 10 minutes.
2. Step S2, starting the drying process, detecting the temperature of the air outlet of the clothes dryer by the temperature detection device according to the preset time interval to obtain a temperature value Ti：
The step starts the action program for drying clothes, and the heating and detecting device of the dryer starts to run. The clothes dryer is provided with a temperature detection device, a timing device and a time display device. At this time, the clothes dryer time display device starts to display the residual time of the drying process in a countdown mode by using the timing device in the clothes dryer from the preset time length t as a starting point, and the preset total clothes drying time t of the embodiment is 2 hours and 30 minutes.
Meanwhile, the temperature sensor starts to detect the air outlet temperature in real time at the air outlet of the dryer, and the detection is generally carried out twice per second. In order to reduce the interference of the calculation amount and the individual jump temperature to the overall trend, the time interval of the adjacent time nodes is taken as 4 minutes. The current temperature T of the air outlet of the dryer is obtained by taking every 4 minutes as an observation windowi。
In another embodiment of the method, TiThe value can also be selected as the average value of the temperatures of the adjacent time periods, namely, the average value of the temperatures measured by the temperature sensors in the adjacent specified time intervals is calculated as the reference value, so that the interference of accidental factors on the final result can be further reduced.
3. Step S3, calculating a temperature difference Δ T ═ T between two adjacent time nodesi-Ti-1：
Continuously calculating the temperature difference delta T at the adjacent time nodes through the operation program of the dryer
4. In step S4, when |. DELTA T ≦ m, it is determined that the instant temperature T at the current moment isiThe value of (A) is the equilibrium temperatureTPAt this time, the temperature equilibrium stage is:
the absolute value of Δ T calculated is compared with the equilibrium temperature difference change constant m set in step S1 at all times. When the delta T is less than or equal to m, the instant temperature T at the current moment is determinediThe value of (A) is the equilibrium temperature TPIn this case, the second stage of the three temperature-raising stages, the temperature equilibrium stage, is present. I.e. t in fig. 30-tGAnd (3) a stage of (a). The temperature stable transformation range of the air outlet of the dryer is within m. Through a large number of experimental summaries, setting m to 2K is a relatively suitable temperature interval judgment parameter.
Meanwhile, the temperature value T of the balance temperature at the moment is recorded by a calculation program in the dryerPThe value is used as the state parameter of the drying process, is an important parameter of the subsequent calculation of the method, and is recorded in the internal operation program of the dryer.
5. Step S5, calculating a deviation value Delta T of the balance temperatureC＝Ti-TPAnd will be Δ TCDelta T compared to the state transition temperature difference constant nC>n, indicating that the temperature starts to enter the temperature rising interval at the moment, and recording the current inflection point time tG：
The drying process will enter the third stage of the temperature raising stage and the temperature will continue to rise as the drying process proceeds and the water content in the dryer decreases. The time inflection point of the drying process at this stage is tGThe judgment mode is that the temperature difference constant n and delta T are changed through state jumpCThe specific way to judge is as follows:
an arithmetic unit in the dryer continuously calculates the instant temperature T of the temperature sensoriAt the above-mentioned equilibrium temperature TPDeviation value of (delta T)C，△TC＝Ti-TPThis value is also compared to the state transition temperature differential constant n set at step S1 (obviously, n ≧ m). In this embodiment, n is 2K.
When Δ TC>n, indicating that the temperature starts to enter the temperature rising interval at the moment, and recording the current inflection point time tGThe product isThe parameter will also be an important parameter in the subsequent calculation of the remaining time, and is also recorded in the internal calculation program of the dryer.
6. Step S6, when the drying process is in the temperature rising interval, at any time tiTime, remaining time t for drying clothesY＝(ti-tG)*[(Tj-TP)/△TC-1]+ eta and displaying t by time display meansYNumerical values:
as shown in fig. 2 and 3, the temperature rising trend is approximately linear with time in the third temperature rising stage of the drying process. The proportional relationship shown in FIG. 4 is used to set the duration of the cooling air after the drying process as the time constant eta, at which time t is an arbitrary timeiTime, remaining time t for drying clothesY＝(ti-tG)*[(Tj-TP)/△TC-1]+ η. The value may be displayed on a time display device of the washing machine.
The method-the remaining time t for drying the laundry-is described above in detailYWe describe the scenario in practical application using the parameter settings of the above embodiments.
First, laundry to be dried is put into the dryer, and a process of drying the laundry is started. The remaining time displayed by the time display means at this time is 2 hours and 30 minutes (i.e., 150 minutes) according to the preset value of the above system, and the countdown is started. At the moment, the dryer starts to work, and the temperature detection device starts to detect the temperature value at the air outlet of the dryer in real time.
At this time, a countdown comparison residual time t needs to be setY', said tY' is an empirical value, and shows, through the use habit of the user and a large amount of experimental data of the drying process, that t is setY' is 0.2t<tY’<0.3t is proper, and when the countdown time reaches tYIn the time of' the drying process, the drying process is usually far away from the first stage of drying temperature rise, and at least in the second stage of drying temperature rise, namely the temperature balance stage. In the present embodiment, t is setY' is 40 minutes, at this timeThe system has obtained the equilibrium temperature T through step S4P。
When the countdown reaches tY', that is, the countdown of the dryer is displayed as remaining 40 minutes, the system proceeds to step S5; calculating the deviation value Delta T of the balance temperatureC＝Ti-TP
And, if Δ TC>n is the deviation value DeltaT of the equilibrium temperatureCWhen the temperature exceeds 2K, the drying process enters the third stage of drying temperature rise, namely a temperature rise interval. The process continues with step S6 where,
by the formula tY＝(ti-tG)*[(Tj-TP)/△TC-1]+η
Wherein t isi＝tY' -40 minutes-out of the total time,
Tjis a preset drying end temperature threshold value,
TPin order to balance the temperature, the temperature of the reaction mixture,
△TCthe deviation of the equilibrium temperature is the difference between the detected temperature and the equilibrium temperature at that time, DeltaTC＝Ti-TP；
Eta is a time constant eta of the cooling air duration, which is set to 10 minutes.
Calculating the actual drying time t by the above operation formulaY，tYWill replace the remaining time t of the current time display deviceY', and with tYCount down with the value of (d) as the starting point.
Otherwise if Δ TCN or less indicates that the temperature is still in the temperature balance stage, the remaining time displayed by the time display device is adjusted to tY", said tY”＝tY' + ε, which is an empirical value indicating that it is expected that the time t will be from the current state to the inflection pointGThe time required. The purpose of the length setting of epsilon is to set the next detection time so that it can fall into the third phase of warming. For example, in the present embodiment, the length of epsilon is set to 5 minutes, and when the remaining time is shown as 40 minutes, the temperature is adjusted according to the current temperature and the equilibrium temperatureDelta T obtained by degree calculationCN, indicating that the time display device is still in a balanced state, and the residual time of the time display device is changed into tY"═ 40+5 ═ 45 minutes. Further, after five minutes, when the remaining time display means of the dryer reaches t againY' (at 40 minutes), Δ T is performed againCAnd (4) comparison operation with n. Until the drying is judged to enter the third stage of temperature rise, the accurate t can be calculatedYUp to the value, and simultaneously performs step S6.
In another embodiment, when the countdown has not reached tY' hour, clothes dryer air outlet temperature TiHas reached a preset drying end temperature threshold TjAnd judging that the drying process is finished at the moment, starting entering a cold air stage after the drying is finished, and displaying the residual time of the drying process by using a time constant eta of the cold air as a starting point and by using a countdown mode by using the time display device at the moment.
The purpose of the present process arrangement is to address drying conditions that occur for some reason, including but not limited to when less laundry is placed. In this case, the drying process is performed very quickly, and the three stages of warming up are completed in a short time. When the countdown means has not reached tY' (40 min.) time, the temperature T of the air outlet of the clothes dryeriHas reached a preset drying end temperature threshold TjIf the drying process is finished, the cold air cooling program is started immediately, the countdown time of the time display device at the moment is directly changed to the long time constant eta (for example, 10 minutes) during the cold air, and the remaining time of the drying process is displayed in a countdown mode.
In one embodiment, a clothes dryer is disclosed, which uses any one of the drying remaining time display calculation methods of the above embodiments, and has the advantages of accurate estimation of the remaining time for drying clothes, simple implementation, and capability of solving the problem of accurately displaying the drying remaining time on the clothes dryer and facilitating the user to take out the clothes in time.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A clothes drying remaining time display method for a clothes dryer provided with a temperature detecting means, a time counting means and a time display means, said time display means displaying a drying process remaining time in a countdown manner, characterized by comprising the steps of:
step S1, performing system presetting, presetting a balance temperature difference change constant m for judging whether the current time is in a temperature balance stage, presetting a state jump temperature difference constant n for judging whether the current time jumps from the temperature balance stage to a temperature rise section, and presetting a drying finishing temperature threshold TjPresetting the cold air time length after drying as a time constant eta;
step S2, starting the drying process, detecting the temperature of the air outlet of the clothes dryer by the temperature detection device according to the preset time interval to obtain a temperature value Ti；
Step S3, calculating a temperature difference Δ T ═ T between two adjacent time nodesi-Ti-1；
In step S4, when |. DELTA T ≦ m, it is determined that the instant temperature T at the current moment isiThe value of (A) is the equilibrium temperature TPAt this time, the temperature is in a temperature equilibrium stage;
step S5, calculating a deviation value Delta T of the balance temperatureC＝Ti-TPAnd will be Δ TCDelta T compared to the state transition temperature difference constant nC>n, indicating that the temperature starts to enter the temperature rising interval at the moment, and recording the current inflection point time tG；
Step S6, the temperature is kept in the drying processDuring the ascending interval, at an arbitrary time tiTime, remaining time t for drying clothesY＝(ti-tG)*[(Tj-TP)/△TC-1]+ eta and displaying t by time display meansYNumerical values.
2. The clothes drying remaining time display method according to claim 1, characterized in that: wherein the step S2 further includes the time display device displaying the remaining time of the drying process in a countdown manner from the preset time length as a starting point.
3. The clothes drying remaining time display method according to claim 2, characterized in that: the preset time length is a total time length t required for drying the laundry according to a full load of the washing machine in a general case.
4. The clothes drying remaining time display method according to claim 1, 2 or 3, characterized in that: setting countdown comparison residual time tY', said tY' is an empirical value, 0.2t<tY’<0.3 t; when the remaining time displayed by the time display device reaches tYWhen' yes, go to step S5; t is a total time period required to dry the laundry according to a full load of the washing machine in a general case,
and the number of the first and second electrodes,
if Δ TC>n, the drying process enters the temperature rising interval, and the process continues to step S6, where the time display device displays tYOtherwise, the rest time displayed by the time display device is adjusted to tY", said tY”＝tY' + ε, which is an empirical value indicating that it is expected that the time t will be from the current state to the inflection pointGThe time required.
5. The clothes drying remaining time display method according to claim 4, characterized in that: when the time displayed by the time display device has not reached tY' hour, clothes dryerTemperature T of air outletiHas reached a preset drying end temperature threshold TjAnd judging that the drying process is finished at the moment, starting entering a cold air stage after the drying is finished, and displaying the residual time of the drying process by using a time constant eta of the cold air as a starting point and by using a countdown mode by using the time display device at the moment.
6. The clothes drying remaining time display method according to claim 1, characterized in that: wherein in step S3, the time interval of the neighboring time node is 4 minutes.
7. The clothes drying remaining time display method according to claim 1, characterized in that: in step S1, the preset cooling air time duration η after the drying is finished is 10 minutes.
8. The clothes drying remaining time display method according to claim 1, characterized in that: in step S1, the preset equilibrium temperature difference change constant m for determining whether the current time is in the temperature equilibrium stage is 2K.
9. The clothes drying remaining time display method according to claim 1, characterized in that: in step S1, the preset state transition temperature difference constant n used for determining whether the current time is from the temperature balance stage to the temperature rise section is 2K.
10. A clothes drying machine characterized by using the clothes drying remaining time display method according to any one of claims 1 to 9.
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| CN112921612B (en) * | 2019-12-06 | 2024-04-12 | 上海海尔洗涤电器有限公司 | Clothes treatment equipment with clothes drying function and clothes drying time estimation method and module thereof |
| CN111102750A (en) * | 2019-12-24 | 2020-05-05 | 追觅科技(上海)有限公司 | Blower control method, blower control device and storage medium |
| CN112176681A (en) * | 2020-09-28 | 2021-01-05 | 珠海格力电器股份有限公司 | Clothes treatment device, control method of clothes treatment device, control device and control system |
| CN112921589B (en) * | 2021-01-07 | 2022-03-04 | 珠海格力电器股份有限公司 | Method and device for analyzing drying and cooling time |
| CN113062094B (en) * | 2021-02-26 | 2022-06-14 | 无锡小天鹅电器有限公司 | Drying control method and device, clothes processing equipment and storage medium |
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