Oven temperature mapping relation correction method and oven

Abstract

The invention relates to the technical field of household appliances, particularly provides an oven temperature mapping relation correction method and an oven, and aims to solve the problem that temperature measurement of an oven cavity is not accurate after the oven is used for a period of time. In order to achieve the purpose, the precise control method provided by the invention comprises the following steps: acquiring a first mapping relation; acquiring a first temperature value in the current oven cavity; acquiring a second temperature value of the current temperature sensing element; and fitting the first temperature value and the second temperature value at the same moment to obtain a second fitting function. According to the control method provided by the invention, the mapping relation between the temperature of the oven cavity and the temperature of the temperature sensing element can be obtained again, so that the temperature of the oven cavity is accurately controlled.

Description

Technical Field

[0001] The invention relates to the technical field of household appliances, and in particular provides a method for correcting an oven temperature mapping relationship and an oven. Background Art

[0002] As people's quality of life improves, their requirements for diet are getting higher and higher, and ovens have become an ideal choice for people to bake food.

[0003] At present, most of the temperature control parameters of ovens on the market are preset at the factory. After users purchase the oven, as the use time increases, the temperature sensing components in the cavity will age, resulting in inaccurate temperature measurement. At the same time, the insulation performance of the oven cavity insulation layer will also decline over time. When the temperature measurement is inaccurate, it will cause the user to have a large temperature deviation when cooking food, which will lead to overcooking or undercooking of food.

[0004] Accordingly, the art needs a new mapping relationship between oven temperature and temperature sensing element to solve the above problems. Summary of the invention

[0005] The present invention aims to solve the above technical problem, that is, the problem of inaccurate measurement of oven cavity temperature after the oven has been used for a period of time. To this end, the present invention provides a method for correcting the oven temperature mapping relationship, and the precise control method comprises the following steps:

[0006] Acquire a first mapping relationship between the oven cavity temperature and the temperature of the temperature sensing element;

[0007] Get the first temperature value in the current oven cavity;

[0008] Acquire a second temperature value of the current temperature sensing element;

[0009] Fitting the first temperature value and the second temperature value at the same time to obtain a second fitting function;

[0010] The first mapping relationship is corrected according to a second fitting function to obtain a second mapping relationship.

[0011] In a specific implementation of the method for correcting the oven temperature mapping relationship, "correcting the first mapping relationship according to the second fitting function to obtain the second mapping relationship" includes the following steps:

[0012] Acquire a third temperature value of the current temperature sensing element;

[0013] Substituting the third temperature value into the second fitting function to obtain a fourth temperature value of the current oven cavity;

[0014] Obtaining an absolute value of a difference between the third temperature value and the fourth temperature value;

[0015] Determining whether a ratio of the absolute value to the fourth temperature value exceeds a preset accuracy value;

[0016] If not, a second mapping relationship is obtained.

[0017] In a specific implementation of the method for correcting the oven temperature mapping relationship, “determining whether the ratio of the absolute value to the seventh temperature value exceeds a preset accuracy value” further includes:

[0018] If so, the first fitting function with undetermined parameters is retrieved.

[0019] In a specific implementation of the method for correcting the oven temperature mapping relationship, the step of "fitting the first temperature value and the second temperature value" includes:

[0020] The second fitting function is obtained by linear fitting, and the formula of the second fitting function is:

[0021] Tq=a*Ts+b;

[0022] Wherein, Tq represents the first temperature value, Ts represents the second temperature value, and a and b are parameters in the second fitting function.

[0023] In a specific implementation of the method for correcting the oven temperature mapping relationship, the step of "fitting the first temperature value and the second temperature value" includes:

[0024] The second fitting function is obtained by nonlinear fitting. The formula of the second fitting function is:

[0025] Tq=c*Ts^2+d*Ts+e

[0026] Wherein, Tq represents the first temperature value, Ts represents the second temperature value, and c, d and e are parameters in the second fitting function.

[0027] In a specific implementation of the method for correcting the oven temperature mapping relationship, the least squares method is used to determine the values ​​of a, b, c, d and e.

[0028] In a specific implementation of the method for correcting the oven temperature mapping relationship, the precise control method further includes the following steps:

[0029] When the oven runs for a preset time, the first temperature value and the second temperature value are obtained.

[0030] In a specific implementation of the method for correcting the oven temperature mapping relationship, the preset time is the sum of the factory setting time and the oven operation time.

[0031] In a specific implementation of the method for correcting the oven temperature mapping relationship, the precise control method includes the following steps:

[0032] When the oven runs for a preset time, the first temperature value and the second temperature value are obtained.

[0033] The present invention provides a method for correcting an oven temperature mapping relationship, and the precise control method comprises the following steps:

[0034] Acquire a first mapping relationship between the oven cavity temperature and the temperature of the temperature sensing element;

[0035] The oven is powered on and runs for a preset time;

[0036] Get the first temperature value in the current oven cavity;

[0037] Acquire a second temperature value of the current temperature sensing element;

[0038] Fitting the first temperature value and the second temperature value to obtain a first fitting function with undetermined parameters;

[0039] Determine the parameters in the first fitting function according to the first temperature value and the second temperature value acquired at the same time, and obtain a second fitting function determined by the parameters;

[0040] Acquire a third temperature value of the current temperature sensing element;

[0041] Substituting the third temperature value into the second fitting function to obtain a fourth temperature value of the current oven cavity;

[0042] Obtaining an absolute value of a difference between the third temperature value and the fourth temperature value;

[0043] Determining whether a ratio of the absolute value to the fourth temperature value exceeds a preset accuracy value;

[0044] If yes, the first fitting function with undetermined parameters is obtained again, otherwise the second mapping relationship is obtained.

[0045] The present invention also provides a controller, which includes the correction method of any one of the oven temperature mapping relationships described above.

[0046] The present invention further provides an oven, wherein the oven includes the method for correcting the oven temperature mapping relationship described in any one of the above.

[0047] The beneficial effect of the method for correcting the oven temperature mapping relationship provided by the present invention is as follows: by re-establishing the fitting relationship between the oven cavity temperature and the temperature of the temperature sensing element at the same time, determining the fitting function, and correcting the first mapping relationship according to the fitting function to obtain the second mapping relationship, the second mapping relationship can accurately reflect the relationship between the oven cavity temperature and the temperature of the temperature sensing element in the current state;

[0048] Furthermore, since multiple first fitting functions and second fitting functions can be obtained by using different fitting methods, the obtained fitting functions are screened in a manner that meets the accuracy requirements. The fitting functions that meet the requirements are not only simple and easy to understand, but also highly accurate.

[0049] The method for correcting the oven temperature mapping relationship provided by the present invention can enable the user to still obtain a satisfactory cooking effect after the oven has been used for a period of time, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0051] Figure 1 It is a simple logic diagram of the precise control method provided by the present invention;

[0052] Figure 2 It is an extended logic diagram of step S6 in the precise control method provided by the present invention;

[0053] Figure 3 It is a detailed logic diagram of the precise control method provided by the present invention. DETAILED DESCRIPTION

[0054] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the relevant oven or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, ordinal numbers "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0055] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] like Figure 1 and Figure 3 As shown, the present invention proposes a correction method for an oven temperature mapping relationship. Before the oven leaves the factory, the temperature in the oven cavity is measured as a fifth temperature value, and the temperature of the temperature sensing element is measured as a sixth temperature value. There is a first mapping relationship between the fifth temperature value and the sixth temperature value. The precise control method includes the following steps:

[0057] Step S1: obtaining a first mapping relationship between the temperature in the oven cavity and the temperature of the temperature sensing element;

[0058] Step S2: obtaining a first temperature value in the current oven cavity;

[0059] Step S3: obtaining a second temperature value of the current temperature sensing element;

[0060] Step S4: fitting the first temperature value and the second temperature value at the same time to obtain a second fitting function;

[0061] Step S5: modifying the first mapping relationship according to a second fitting function to obtain a second mapping relationship.

[0062] In this embodiment, the first mapping relationship has been set before the oven leaves the factory, and the sixth temperature value is associated with the fifth temperature value through the first mapping relationship. Since the first mapping relationship is no longer accurate during the use of the oven, it is necessary to modify the first mapping relationship to obtain the second mapping relationship. The second mapping relationship can reflect the accurate relationship between the temperature in the oven cavity and the temperature displayed by the temperature sensing element. Based on this accurate relationship, the user can obtain the accurate temperature in the oven cavity, avoid the problem of overcooking or undercooking of food in the oven, and greatly improve the user experience.

[0063] In the correction process of the first mapping relationship, it is first necessary to obtain the current temperature in the oven cavity and name it as the first temperature value. It is also necessary to obtain the current temperature of the temperature sensing element and name it as the second temperature value. Then, the first temperature value and the second temperature value are fitted to obtain a first fitting function. The parameters in the first fitting function are undetermined.

[0064] When the first fitting function is fitted successfully, since the parameters in the first fitting function are undetermined, the next step is to find these parameters. If there is one parameter in the first fitting function, then it is only necessary to obtain the first temperature value once and the second temperature value once; if there are two parameters in the first fitting function, then it is necessary to obtain the first temperature value twice and the second temperature value twice, and these four values ​​correspond to two sets of data. Similarly, if there are n parameters in the first fitting function, then it is necessary to obtain n first temperature values ​​and n second temperature values, and these n first temperature values ​​and n second temperature values ​​form n sets of data in a corresponding manner.

[0065] The corresponding data are substituted into the first fitting function to determine the parameters, and then a second fitting function with determined parameters is obtained.

[0066] It should be noted that the independent variable in the first fitting function can be either the first temperature value or the second temperature value; similarly, the dependent variable in the first fitting function can be either the first temperature value or the second temperature value. It is only necessary to match the first temperature value with the second temperature value. If the fifth temperature value is an independent variable in the first mapping relationship, then the first temperature value is also an independent variable in the first fitting function; if the fifth temperature value is a dependent variable in the first mapping relationship, then the first temperature value is also a dependent variable in the first fitting function.

[0067] It should be further explained that the temperature in the oven cavity is obtained by using a food probe. The temperature sensing element is selected to be a cavity temperature sensor provided by the oven.

[0068] Further, if Figure 2 and Figure 3 As shown, “correcting the first mapping relationship according to the second fitting function to obtain a second mapping relationship” includes the following steps:

[0069] Step S51: obtaining a third temperature value of the current temperature sensing element;

[0070] Step S52: Substituting the third temperature value into the second fitting function to obtain a fourth temperature value of the current oven cavity;

[0071] Step S53: obtaining the absolute value of the difference between the third temperature value and the fourth temperature value;

[0072] Step S54: determining whether the ratio of the absolute value to the fourth temperature value exceeds a preset accuracy value;

[0073] Step S55: If not, obtain a second mapping relationship.

[0074] In this embodiment, after fitting and parameter determination, multiple second fitting functions, i.e., second mapping relationships, are obtained, but the second mapping relationships still need to be verified to see whether they meet the accuracy requirements. Therefore, in the correction of the first mapping relationship by the second fitting function, the current temperature value of the temperature sensing element is first obtained and marked as the third temperature value, and then the third temperature value is substituted into the second fitting function to obtain the fourth temperature value, which is the temperature value in the current oven cavity. The third temperature value is subtracted from the fourth temperature value and the absolute value of the difference is obtained, and then the absolute value is compared with the fourth temperature value to obtain a ratio, and the obtained ratio is compared with the preset accuracy value. If it does not exceed the preset accuracy value, it proves that the second fitting function is suitable, and the user can obtain a relatively accurate temperature in the oven cavity from the temperature sensing element.

[0075] It should be noted that the preset accuracy value is the value of the oven before leaving the factory, and this value is the ratio of the absolute value of the difference between the fifth temperature value and the sixth temperature value to the first temperature. Since the oven is not used when leaving the factory, this preset accuracy value ensures the stability of the first mapping relationship, and the first mapping relationship accurately reflects the relationship between the temperature in the oven cavity and the temperature displayed by the temperature sensing element in both the theoretical design stage and the practical application stage.

[0076] Further, if Figure 2 As shown, “determining whether the ratio of the absolute value to the seventh temperature value exceeds a preset accuracy value” also includes:

[0077] Step S56: If yes, then the first fitting function with undetermined parameters is obtained again.

[0078] In this embodiment, when the ratio exceeds the preset accuracy value, it proves that the second fitting function is not accurate. Therefore, it is necessary to re-fit. Through different fitting methods, a different first fitting function is obtained, and then the parameters in the first fitting function are determined to obtain the second fitting function. Then, the first mapping relationship is corrected again to obtain the second mapping relationship.

[0079] Further, the step of “fitting the first temperature value and the second temperature value” includes:

[0080] The second fitting function is obtained by linear fitting, and the formula of the second fitting function is:

[0081] Tq=a*Ts+b;

[0082] Wherein, Tq represents the first temperature value, Ts represents the second temperature value, and a and b are parameters in the second fitting function.

[0083] In this embodiment, the linear fitting function is not only simple to understand and easy to optimize, but also has the advantage of strong predictability. Through linear fitting, a set of parameters can be obtained, and these parameters are used to express the relationship between the independent variable and the dependent variable. In addition, the parameters in the linear function fitting have clear physical meanings and can be used to explain the influence of the independent variable on the dependent variable.

[0084] It should be noted that in practical applications, the linear meshing needs to be properly evaluated and verified according to the actual situation to reduce the probability of obtaining an erroneous linear fitting function.

[0085] Further, the step of “fitting the first temperature value and the second temperature value” includes:

[0086] The second fitting function is obtained by nonlinear fitting. The formula of the second fitting function is:

[0087] Tq=c*Ts^2+d*Ts+e

[0088] Wherein, Tq represents the first temperature value, Ts represents the second temperature value, and c, d and e are parameters in the second fitting function.

[0089] In this embodiment, quadratic function fitting is a mathematical method used to fit a set of data points to a quadratic function in order to better understand the trend and shape of the data.

[0090] It should be noted that during the design and development phase of the oven, the R&D personnel took into account the relationship between the oven cavity temperature and the temperature sensing element, and used a linear fitting function to map the two. During the later use of the oven, although the mapping relationship between the two changes, it will not change significantly. Therefore, when shaping the first fitting function, no complex fitting method is involved. The fitting of the quadratic function can fully meet the accuracy requirements, and the fitting of the linear function can solve the remapping of most ovens.

[0091] Further, the values ​​of a, b, c, d and e are determined using the least squares method.

[0092] In this embodiment, the least square method is a mathematical optimization technique that can efficiently find corresponding parameters and reduce errors.

[0093] Furthermore, the precise control method further comprises the following steps:

[0094] When the oven runs for a preset time, the first temperature value and the second temperature value are obtained.

[0095] In this embodiment, after the oven runs for a preset time, the temperature can be guaranteed to be in a balanced state. At this time, the slight change in the temperature in the oven cavity can be ignored, and the slight change in the temperature displayed by the temperature sensing element can also be ignored. Under stable temperature measurement, the accuracy can be greatly improved and unnecessary errors caused by special circumstances can be avoided.

[0096] It should be noted that the preset time can be set before the oven leaves the factory, usually between 15-30 minutes.

[0097] When the oven leaves the factory, it can be equipped with a built-in program, and the mapping relationship correction program can be added to the controller. At regular intervals, the user can input correction commands to the controller through the operation panel. Under the correction commands, the program runs automatically, and the mapping relationship between the temperature in the oven cavity and the temperature displayed by the temperature sensing element is re-established.

[0098] Furthermore, the preset time is the sum of the factory set time and the oven operation time.

[0099] In this embodiment, in order to ensure the stable operation of the temperature sensing element, the preset time is selected as the sum of the factory setting time and the oven operation time. That is, when the oven leaves the factory, a time will be set internally, and after this time, the temperature will tend to balance. Then, after the oven is officially used, the oven will record the usage time, and this usage time will be converted into the operation time. This time selection method can avoid the influence of aging of the temperature sensing element.

[0100] The present invention provides a method for correcting an oven temperature mapping relationship. The oven is provided with a temperature sensing element. Before the oven leaves the factory, the temperature in the oven cavity is measured as a fifth temperature value, and the temperature of the temperature sensing element is measured as a sixth temperature value. There is a first mapping relationship between the fifth temperature value and the sixth temperature value. The precise control method comprises the following steps:

[0101] Step M1: obtaining a first mapping relationship between the oven cavity temperature and the temperature of the temperature sensing element;

[0102] Step M2: The oven is powered on and runs for a preset time;

[0103] Step M3: obtaining a first temperature value in the current oven cavity;

[0104] Step M4: obtaining a second temperature value of the current temperature sensing element;

[0105] Step M5: fitting the first temperature value and the second temperature value to obtain a first fitting function with undetermined parameters;

[0106] Step M6: determining parameters in the first fitting function according to the first temperature value and the second temperature value acquired at the same time, and obtaining a second fitting function with determined parameters;

[0107] Step M7: obtaining a third temperature value of the current temperature sensing element;

[0108] Step M8: Substituting the third temperature value into the second fitting function to obtain a fourth temperature value of the current oven cavity;

[0109] Step M9: obtaining the absolute value of the difference between the third temperature value and the fourth temperature value;

[0110] Step M10: determining whether the ratio of the absolute value to the fourth temperature value exceeds a preset accuracy value;

[0111] Step M11: If yes, then re-obtain the first fitting function with undetermined parameters; otherwise, obtain the second mapping relationship.

[0112] The beneficial effect of the method for correcting the oven temperature mapping relationship provided by the present invention is as follows: by re-establishing the fitting relationship between the oven cavity temperature and the temperature of the temperature sensing element at the same time, determining the fitting function, and correcting the first mapping relationship according to the fitting function to obtain the second mapping relationship, the second mapping relationship can accurately reflect the relationship between the oven cavity temperature and the temperature of the temperature sensing element in the current state;

[0113] Furthermore, since multiple first fitting functions and second fitting functions can be obtained by using different fitting methods, the obtained fitting functions are screened in a manner that meets the accuracy requirements. The fitting functions that meet the requirements are not only simple and easy to understand, but also highly accurate.

[0114] The method for correcting the oven temperature mapping relationship provided by the present invention can enable the user to still obtain a satisfactory cooking effect after the oven has been used for a period of time, thereby improving the user experience.

[0115] The present invention further provides a controller, wherein the controller includes the method for correcting the oven temperature mapping relationship described in any one of the above embodiments.

[0116] The controller provided by the present invention can run a program of a correction method for an oven temperature mapping relationship, and can automatically recalibrate the first mapping relationship to obtain an accurate second mapping relationship when a customer needs it.

[0117] The present invention further provides an oven, comprising the method for correcting the oven temperature mapping relationship described in any one of the above embodiments.

[0118] The automatic calibration procedure of the oven internal temperature provided by the present invention can obtain the accurate correspondence between the temperature sensing element measurement value and the temperature of the center point of the inner tank cavity after the current component aging and insulation material performance attenuation, thereby correcting the temperature field system error caused by aging and performance attenuation. This oven not only has an excellent user experience, but also has strong market competitiveness.

[0119] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for correcting an oven temperature mapping relationship, characterized in that: The correction method comprises the following steps: Acquire a first mapping relationship between the oven cavity temperature and the temperature of the temperature sensing element; Get the first temperature value in the current oven cavity; Acquire a second temperature value of the current temperature sensing element; Fitting the first temperature value and the second temperature value at the same time to obtain a second fitting function; The first mapping relationship is corrected according to a second fitting function to obtain a second mapping relationship.

2. The method for correcting the oven temperature mapping relationship according to claim 1, characterized in that: “Correcting the first mapping relationship according to the second fitting function to obtain a second mapping relationship” includes the following steps: Acquire a third temperature value of the current temperature sensing element; Substituting the third temperature value into the second fitting function to obtain a fourth temperature value of the current oven cavity; Obtaining an absolute value of a difference between the third temperature value and the fourth temperature value; Determining whether a ratio of the absolute value to the fourth temperature value exceeds a preset accuracy value; If not, a second mapping relationship is obtained.

3. The method for correcting the oven temperature mapping relationship according to claim 2, characterized in that: “Determining whether the ratio of the absolute value to the fourth temperature value exceeds a preset accuracy value” also includes: If yes, the second fitting function is retrieved.

4. The method for correcting the oven temperature mapping relationship according to claim 1, characterized in that: The step of "fitting the first temperature value and the second temperature value" comprises: The second fitting function is obtained by linear fitting, and the formula of the second fitting function is: Tq=a*Ts+b; Wherein, Tq represents the first temperature value, Ts represents the second temperature value, and a and b are parameters in the second fitting function.

5. The method for correcting the oven temperature mapping relationship according to claim 1, characterized in that: The step of "fitting the first temperature value and the second temperature value" comprises: The second fitting function is obtained by nonlinear fitting. The formula of the second fitting function is: Tq=c*Ts^2+d*Ts+e Wherein, Tq represents the first temperature value, Ts represents the second temperature value, and c, d and e are parameters in the second fitting function.

6. The method for correcting the oven temperature mapping relationship according to claim 4 or 5, characterized in that: The values ​​of a, b, c, d, and e were determined using the least squares method.

7. The method for correcting the oven temperature mapping relationship according to claim 1, characterized in that: The precise control method further comprises the following steps: When the oven runs for a preset time, the first temperature value and the second temperature value are obtained.

8. The method for correcting the oven temperature mapping relationship according to claim 7, characterized in that: The preset time is the sum of the factory set time and the oven running time.

9. A method for correcting an oven temperature mapping relationship, characterized in that: The precise control method comprises the following steps: Acquire a first mapping relationship between the oven cavity temperature and the temperature of the temperature sensing element; The oven is powered on and runs for a preset time; Get the first temperature value in the current oven cavity; Acquire a second temperature value of the current temperature sensing element; Fitting the first temperature value and the second temperature value to obtain a first fitting function with undetermined parameters; Determine the parameters in the first fitting function according to the first temperature value and the second temperature value acquired at the same time, and obtain a second fitting function determined by the parameters; Acquire a third temperature value of the current temperature sensing element; Substituting the third temperature value into the second fitting function to obtain a fourth temperature value of the current oven cavity; Obtaining an absolute value of a difference between the third temperature value and the fourth temperature value; Determining whether a ratio of the absolute value to the fourth temperature value exceeds a preset accuracy value; If yes, the first fitting function with undetermined parameters is obtained again, otherwise the second mapping relationship is obtained.

10. An oven, characterized in that: The oven includes a method for correcting an oven temperature mapping relationship according to any one of claims 1-9.

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