CN116439581A - Oven temperature control method and device and oven - Google Patents

Abstract

The application relates to the technical field of household appliances and discloses a control method of oven temperature. The method comprises the following steps: obtaining a first temperature difference between a first internal temperature of the oven and a set temperature when the internal temperature of the oven is increased to be greater than the set temperature; obtaining an actual adjustment strategy corresponding to the first temperature difference value according to the corresponding relation between the temperature difference value and the PID parameter adjustment strategy; wherein, as the absolute value of the temperature difference increases, the proportional parameter in the PID parameter is firstly reduced and then stops to be reduced, and the integral parameter in the PID parameter is increased; adjusting the first PID parameter according to the actual adjustment strategy to obtain an adjusted PID parameter; and configuring the regulated PID parameters to the PID controller, so that the configured PID controller can continuously control the oven. The method can reduce the requirement of the internal temperature stability of the oven on the PID parameters and reduce the setting difficulty of the PID parameters. The application also discloses a control device of oven temperature and an oven.

Description

Oven temperature control method and device and oven

Technical Field

The application relates to the technical field of household appliances, for example to a control method and device of oven temperature and an oven.

Background

Currently, ovens are generally controlled using proportional-integral-derivative (Proportion Integral Differential, PID) controllers, for accurate temperature control, it is necessary to configure the PID controller with appropriate PID parameters: proportional parameters, integral parameters, and derivative parameters.

In the process of implementing the embodiment of the present application, it is found that at least the following problems exist in the related art:

the internal temperature of the oven may be as high as 200 c or higher, and during heating of the oven, the internal temperature of the oven may be raised from near room temperature (e.g., 20 c) to 200 c or higher, which temperature spans a relatively large distance. If the internal temperature of the oven is made to have higher stability, the PID parameters of the PID controller of the oven are required to be higher, which increases the setting difficulty of the PID parameters of the PID controller.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the application provides a control method and device for the temperature of an oven and the oven, wherein after the internal temperature of the oven reaches a set temperature, the internal temperature stability of the oven is improved by adopting a mode of adjusting proportional parameters and/or integral parameters, and the dependence of the internal temperature stability of the oven on PID parameters is reduced.

In some embodiments, a method of controlling oven temperature includes: obtaining a first temperature difference between a first internal temperature of an oven and a set temperature when the internal temperature of the oven increases to be greater than the set temperature; obtaining a first PID parameter of a PID controller of the oven; obtaining an actual adjustment strategy corresponding to the first temperature difference value according to the corresponding relation between the temperature difference value and the PID parameter adjustment strategy; wherein, as the absolute value of the temperature difference increases, the proportional parameter in the PID parameter is firstly reduced and then stops to be reduced, and the integral parameter in the PID parameter is increased; adjusting the first PID parameter according to the actual adjustment strategy to obtain an adjusted PID parameter; and configuring the adjusted PID parameters to the PID controller, so that the configured PID controller continues to control the oven.

Optionally, obtaining an actual adjustment policy corresponding to the first temperature difference according to a correspondence between a temperature difference and a PID parameter adjustment policy, including: when the absolute value of the first temperature difference value is larger than a first temperature threshold value and smaller than or equal to a second temperature threshold value, reducing the proportion parameter in the first PID parameter according to a first adjusting coefficient, and increasing the integral parameter in the first PID parameter according to a second adjusting coefficient, so as to determine the actual adjusting strategy; when the absolute value of the first temperature difference value is larger than a second temperature threshold value, increasing the proportional parameter in the first PID parameter according to a third adjusting coefficient, and increasing the integral parameter in the first PID parameter according to a fourth adjusting coefficient, so as to determine the actual adjusting strategy; wherein the integration parameter after the increase according to the fourth adjustment coefficient is larger than the integration parameter after the increase according to the second adjustment coefficient.

Optionally, increasing the integral parameter of the first PID parameter according to the second adjustment coefficient includes: and determining the product of the integral parameter in the first PID parameter and the second regulating coefficient as the integral parameter in the regulated PID parameter.

Optionally, increasing the integral parameter of the first PID parameter according to a fourth adjustment coefficient includes: and determining the product of the integral parameter in the first PID parameter and the fourth regulating coefficient as the integral parameter in the regulated PID parameter.

Optionally, according to the correspondence between the temperature difference and the PID parameter adjustment policy, obtaining an actual adjustment policy corresponding to the first temperature difference, and further including: determining a proportional parameter of the first PID parameter reduced according to a fifth adjustment coefficient as the actual adjustment strategy when the absolute value of the first temperature difference is greater than a third temperature threshold and less than or equal to the first temperature threshold; in the event that the absolute value of the first temperature difference is less than or equal to a third temperature threshold, the first PID parameter will be maintained to determine the actual tuning strategy.

Optionally, in case the internal temperature of the oven increases to be greater than a set temperature, obtaining a first temperature difference of the first internal temperature of the oven and the set temperature comprises: and in the process of increasing the internal temperature of the oven, under the condition that the internal temperature is larger than the set temperature for the first time, obtaining a first temperature difference value between the first internal temperature of the oven and the set temperature.

Optionally, after the configured PID controller is enabled to continue controlling the oven, the method further comprises: obtaining a second temperature difference between a second internal temperature of the oven and the set temperature if the internal temperature of the oven is not first increased to be greater than the set temperature; obtaining a second PID parameter of the PID controller; and reducing the proportion parameter in the second PID parameter according to a sixth regulating coefficient under the condition that the absolute value of the second temperature difference value is larger than or equal to a fourth temperature threshold value.

In some embodiments, the control device of the oven temperature comprises a first obtaining module, a second obtaining module, a third obtaining module, an adjusting module and a configuration module; the first obtaining module is used for obtaining a first temperature difference value between the first internal temperature of the oven and the set temperature under the condition that the internal temperature of the oven is increased to be more than the set temperature; the second obtaining module is used for obtaining a first PID parameter of a PID controller of the oven; the third obtaining module is used for obtaining an actual adjustment strategy corresponding to the first temperature difference value according to the corresponding relation between the temperature difference value and the PID parameter adjustment strategy; wherein, as the absolute value of the temperature difference increases, the proportional parameter in the PID parameter is firstly reduced and then stops to be reduced, and the integral parameter in the PID parameter is increased; the adjusting module is used for adjusting the first PID parameter according to the actual adjusting strategy to obtain an adjusted PID parameter; the configuration module is used for configuring the adjusted PID parameters to the PID controller, so that the configured PID controller can continuously control the oven.

In some embodiments, the control device of the oven temperature comprises a processor and a memory storing program instructions, characterized in that the processor is configured to execute the control method of the oven temperature provided in the previous embodiments when executing the program instructions.

In some embodiments, the oven includes the oven temperature control device provided by the previous embodiments.

The oven temperature control method, the oven temperature control device and the oven provided by the embodiment of the application can realize the following technical effects:

after the internal temperature of the oven is increased to be equal to the set temperature, the internal temperature of the oven is recorded as a first internal temperature, and the first internal temperature of the oven is continuously increased due to the characteristic of large hysteresis of temperature control, and the first temperature difference value between the first internal temperature and the set temperature is continuously increased; when the absolute value of the first temperature difference value is smaller, properly reducing the proportional parameter in the first PID parameter and increasing the integral parameter in the first PID parameter to obtain an adjusted PID parameter, and controlling the oven based on the adjusted PID parameter; if the first temperature difference value is not increased but gradually reduced in the control process, ending the adjustment process of the first PID parameter, so that the influence of the proportional term in the PID controller on the first internal temperature is reduced, the influence of the integral term in the PID controller on the first internal temperature is improved, the fluctuation is reduced, and the first internal temperature is quickly stabilized to the set temperature; if the first temperature difference value is continuously increased in the control process of the oven based on the adjusted PID parameters, the integral parameters in the adjusted PID parameters can be continuously increased, the proportion parameters in the adjusted PID parameters are stopped to be reduced, so that the influence of integral items in the PID controller on the first internal temperature is improved, the influence of the proportion items on the first internal temperature is maintained or improved, the overshoot is effectively restrained, the phenomenon of large fluctuation is reduced, and the internal temperature stability of the oven is improved. Therefore, under the condition that the requirements on the internal temperature stability of the oven are the same, the internal temperature stability of the oven is improved by adopting a mode of adjusting the first PID parameter according to the first temperature difference value, the requirement of the internal temperature stability of the oven on the PID parameter can be reduced, and the setting difficulty of the PID parameter is reduced.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which:

FIG. 1 is a schematic illustration of the internal temperature of an oven over time provided in an embodiment of the present application;

FIG. 2 is a schematic flow chart of a method for controlling oven temperature according to an embodiment of the present disclosure;

FIG. 3 is a schematic flow chart of a method for controlling oven temperature according to an embodiment of the present disclosure;

FIG. 4 is a schematic flow chart of a method for controlling oven temperature according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of an oven temperature control device according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of an oven temperature control device according to an embodiment of the present application.

Detailed Description

For a more complete understanding of the features and technical content of the embodiments of the present application, reference should be made to the following detailed description of the embodiments of the present application, taken in conjunction with the accompanying drawings, which are for purposes of illustration only and not intended to limit the embodiments of the present application. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present application described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present application, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

Fig. 1 is a schematic diagram of an internal temperature profile of an oven over time provided in an embodiment of the present application. The heating process of the oven will be briefly described with reference to fig. 1: when the oven starts to heat, the internal temperature T of the oven is lower than the set temperature Ts, and then the heating device in the oven is controlled to continuously heat, for example, the heating device in the oven is controlled to heat by using the PID controller, as the internal temperature T of the oven is continuously increased, the internal temperature T of the oven reaches (equals) the set temperature Ts for the first time at time T1, and then the internal temperature T of the oven is continuously increased, after being increased to a certain extent, for example, at time T2, the internal temperature T of the oven is reduced until being lower than the set temperature Ts, as shown at time T3, and then the internal temperature T of the oven continuously fluctuates around the set temperature Ts, and the fluctuation range is smaller and smaller until being stabilized at the set temperature Ts (the temperature difference between the set temperature Ts and the internal temperature T is within a temperature control dead zone).

By adopting the control method for the temperature of the oven, after the internal temperature of the oven reaches the set temperature for the first time, the proportional parameter and the integral parameter of the PID controller are adjusted according to the temperature difference between the internal temperature of the oven and the set temperature, so that the response of the proportional term (product of the proportional parameter and the temperature difference) and the integral term (product of integral parameter and integral of the temperature difference) of the PID controller to the temperature difference is changed along with the change of the temperature difference, and the overshoot of the internal temperature of the oven meets the temperature stability requirement, and the internal temperature stability of the oven is improved. Due to the adoption of the process, the internal temperature stability of the oven is improved, the requirement of the internal temperature stability of the oven on the PID parameters can be reduced under the condition that the requirement of the internal temperature stability of the oven is unchanged, and the setting difficulty of the PID parameters is reduced.

Fig. 2 is a flow chart of a method for controlling oven temperature according to an embodiment of the present application. The control method of the oven temperature may be performed by a controller of the oven or may be performed by a server connected to the oven.

Referring to fig. 2, the control method of the oven temperature includes:

s201, when the internal temperature of the oven is increased to be greater than the set temperature, a first temperature difference value between the first internal temperature of the oven and the set temperature is obtained.

The first internal temperature of the oven may be obtained by a temperature sensor provided inside the oven.

The set temperature refers to a temperature required to be reached inside the oven, and may be a temperature manually set by a user, or may be a set temperature corresponding to an operation mode (e.g., a baking mode) of the oven.

In the practical application process, the first internal temperature is subtracted from the set temperature to obtain a first temperature difference; in case the internal temperature of the oven increases and is less than the set temperature, the first temperature difference is typically negative.

In connection with the change curve of the internal temperature of the oven shown in fig. 1, the case where the internal temperature of the oven is increased to be greater than the set temperature includes: the temperature inside the oven increases to be greater than the set temperature for the first time, and the temperature inside the oven does not increase to be greater than the set temperature for the first time.

The first temperature difference between the first internal temperature of the oven and the set temperature can be obtained when the internal temperature of the oven is increased and is larger than the set temperature for the first time. Therefore, frequent adjustment of PID parameters of PID control can be reduced, so that the PID controller can control the internal temperature of the oven under the condition of relatively stability, and further relatively ideal temperature stability is obtained.

S202, obtaining a first PID parameter of a PID controller of the oven.

The first PID parameter of the PID controller can be read directly here, or alternatively, the stored, set first PID parameter can be read directly.

In the embodiment of the present application, the first PID parameter refers to a PID parameter in the case where the comparative example parameter and the integral parameter are adjusted simultaneously, and the second PID parameter hereinafter refers to a PID parameter in the case where only the comparative example parameter is adjusted, which is different in the stage where the control flow is located.

S203, obtaining an actual adjustment strategy corresponding to the first temperature difference value according to the corresponding relation between the temperature difference value and the PID parameter adjustment strategy.

The corresponding relation between the temperature difference and the PID parameter adjustment strategy can be embodied in the form of a one-to-one corresponding data table which can be stored in a database, and after the first temperature difference is obtained, the actual adjustment strategy corresponding to the first temperature difference can be obtained by inquiring the database.

The adjusting strategy of the PID parameter comprises an adjusting strategy of a proportional parameter and an integral parameter in the PID parameter, wherein the adjusting strategy of the proportional parameter comprises the following steps: increasing the proportion parameter, maintaining the proportion parameter and decreasing the proportion parameter; the adjustment strategy for the integral parameters comprises the following steps: increasing the integral parameter, maintaining the integral parameter, and decreasing the integral parameter.

Further, the correspondence between the temperature difference and the PID parameter adjustment strategy includes: with the increase of the absolute value of the temperature difference, the proportional parameter in the PID parameter is firstly reduced and then stopped to be reduced, and the integral parameter in the PID parameter is increased.

The proportion parameter in the PID parameter is firstly reduced and then stopped being reduced, comprising: the proportional parameters in the PID parameters are reduced and then maintained unchanged, and the proportional parameters in the PID parameters are reduced and then increased.

The process of obtaining the actual adjustment strategy corresponding to the first temperature difference according to the correspondence between the temperature difference and the PID parameter adjustment strategy is further described below.

Optionally, obtaining an actual adjustment policy corresponding to the first temperature difference according to a correspondence between the temperature difference and the PID parameter adjustment policy, including: in the event that the absolute value of the first temperature difference is less than or equal to the third temperature threshold, the maintenance first PID parameter is determined as the actual tuning strategy. In the case that the absolute value of the first temperature difference is less than or equal to the third temperature threshold, it means that the PID controller can make the internal temperature stability of the oven meet the requirement based on the first PID parameter. At this time, the first PID parameter is maintained to maintain the existing temperature stability.

In the case where the absolute value of the first temperature difference is greater than the third temperature threshold and less than or equal to the first temperature threshold, the proportional parameter in the first PID parameter is reduced by the fifth adjustment coefficient is determined as the actual adjustment strategy. For example, the product of the fifth adjustment coefficient and the scaling parameter in the first PID parameter may be determined as the scaling parameter in the adjusted PID parameter, wherein the fifth adjustment coefficient is less than 1.

The fifth adjustment factor may be obtained experimentally, for example, by continuously changing the fifth adjustment factor and monitoring the amount of overshoot of the internal temperature of the oven, and determining the fifth adjustment factor when the amount of overshoot meets the requirements.

The first temperature threshold and the third temperature threshold are used to indicate requirements for the internal temperature stability of the oven, for example, the higher the requirements for the internal temperature stability, the smaller the first temperature threshold and the third temperature threshold; the lower the requirement for internal temperature stability, the greater both the first and third temperature thresholds.

Specifically, the first temperature threshold and the third temperature threshold may both be positively correlated with the set temperature, for example, a product of the set temperature and the first coefficient may be determined as the first temperature threshold, and a product of the set temperature and the third coefficient may be determined as the third temperature threshold; wherein, the first coefficient and the third coefficient are smaller than 1, and the higher the requirement on the internal temperature stability of the oven is, the smaller the first coefficient and the third coefficient are; the lower the internal temperature stability requirement of the oven, the greater the first and third coefficients.

In the case where the demand for temperature stability is expressed in terms of demand for overshoot, both the first temperature threshold and the third temperature threshold are smaller than the demand overshoot.

Optionally, according to the correspondence between the temperature difference and the PID parameter adjustment policy, obtaining an actual adjustment policy corresponding to the first temperature difference, and further includes: decreasing the proportional parameter in the first PID parameter according to the first adjustment coefficient and increasing the integral parameter in the first PID parameter according to the second adjustment coefficient when the absolute value of the first temperature difference is greater than the first temperature threshold and less than or equal to the second temperature threshold; increasing the proportional parameter in the first PID parameter according to the third regulating coefficient and increasing the integral parameter in the first PID parameter according to the fourth regulating coefficient under the condition that the absolute value of the first temperature difference value is larger than the second temperature threshold value; wherein the proportional parameter after the reduction according to the first adjustment coefficient is smaller than the proportional parameter after the reduction according to the fifth adjustment coefficient, and the integral parameter after the increase according to the fourth adjustment coefficient is larger than the integral parameter after the increase according to the second adjustment coefficient.

The second temperature threshold is used to indicate a requirement for the internal temperature stability of the oven, e.g., the higher the requirement for the internal temperature stability, the smaller the second temperature threshold; the lower the requirement for internal temperature stability, the greater the second temperature threshold.

In particular, the second temperature threshold may be positively correlated with the set temperature, e.g., the product of the set temperature and the second coefficient may be determined as the second temperature threshold; wherein the second coefficient is smaller than 1, the higher the requirement for the internal temperature stability of the oven, the smaller the second coefficient; the lower the internal temperature stability requirement of the oven, the greater the second coefficient.

In the case where the demand for temperature stability is expressed in terms of demand for overshoot, both the first temperature threshold and the second temperature threshold are smaller than the demand overshoot.

The first adjustment coefficient and the second adjustment coefficient may be obtained by a test method, for example, the first adjustment coefficient and the second adjustment coefficient are continuously changed, and an overshoot of the internal temperature of the oven is monitored, and when the overshoot meets the requirement, the first adjustment coefficient and the second adjustment coefficient may be determined.

Under the condition that the proportion parameter in the first PID parameter is the proportion parameter before being reduced according to the fifth adjusting coefficient, the product of the proportion parameter in the first PID parameter and the first adjusting coefficient can be determined as the proportion parameter in the adjusted PID parameter, and the first adjusting coefficient is smaller than the fifth adjusting coefficient;

in the case where the proportional parameter in the first PID parameter is the proportional parameter after being reduced according to the fifth adjustment coefficient, the product of the proportional parameter in the first PID parameter and the first adjustment coefficient may be determined as the proportional parameter in the adjusted PID parameter, the first adjustment coefficient being smaller than 1.

And determining the product of the integral parameter in the first PID parameter and the second adjusting coefficient as the integral parameter in the adjusted PID parameter. Wherein the second adjustment factor is greater than 1.

In increasing the proportional parameter in the first PID parameter according to the third adjustment coefficient and increasing the integral parameter in the first PID parameter according to the fourth adjustment coefficient, two embodiments may be included:

the proportional parameter in the first PID parameter is the proportional parameter before decreasing according to the fifth adjustment coefficient, and the integral parameter in the first PID parameter is the integral parameter before increasing according to the second adjustment coefficient, in which case the product of the proportional parameter in the first PID parameter and the third adjustment coefficient is determined as the proportional parameter in the adjusted PID parameter, wherein the third adjustment coefficient is greater than or equal to the first adjustment coefficient, and the proportional parameter in the first PID parameter increases if the third adjustment coefficient is greater than the first adjustment coefficient, and the proportional parameter in the first PID parameter remains unchanged if the third adjustment coefficient is equal to the first adjustment coefficient; and determining the product of the integral parameter in the first PID parameter and a fourth adjusting coefficient as the integral parameter in the adjusted PID parameter, wherein the fourth adjusting coefficient is larger than the second adjusting coefficient.

The proportional parameter in the first PID parameter is the proportional parameter after decreasing according to the fifth adjustment coefficient and the first adjustment coefficient, and the integral parameter in the first PID parameter is the integral parameter after increasing according to the second adjustment coefficient, in which case the product of the proportional parameter in the first PID parameter and the third adjustment coefficient is determined as the proportional parameter in the adjusted PID parameter, wherein the third adjustment coefficient is greater than or equal to 1, the proportional parameter in the first PID parameter increases in case the third adjustment coefficient is greater than 1, and the proportional parameter in the first PID parameter remains unchanged in case the third adjustment coefficient is equal to 1; and determining the product of the integral parameter in the first PID parameter and a fourth adjusting coefficient as the integral parameter in the adjusted PID parameter, wherein the fourth adjusting coefficient is larger than 1.

Likewise, the specific values of the third adjustment coefficient and the fourth adjustment coefficient may be obtained by a test, and reference is made to the process of obtaining the first adjustment coefficient and the second adjustment coefficient, which is not described herein.

By adopting the technical scheme, the actual adjustment strategy corresponding to the first temperature difference value can be obtained.

S204, adjusting the first PID parameter according to the actual adjustment strategy to obtain an adjusted PID parameter.

S205, configuring the adjusted PID parameters to the PID controller, so that the configured PID controller can continuously control the oven.

And configuring the adjusted PID parameters to the PID parameters, namely: and assigning a value to the PID parameter of the PID controller by utilizing the adjusted PID parameter.

The continuous control of the oven according to the configured PID controller means that the temperature difference between the set temperature and the internal temperature of the oven is input to the (configured) PID controller, and the PID controller can output a control quantity corresponding to the temperature difference, wherein the control quantity can correspond to pulse width modulation (Pulse width modulation, PWM) of the oven heating device or corresponds to the current of the oven heating device, and the heating power of the oven heating device can be adjusted by utilizing the control quantity, so that the adjustment of the internal temperature of the oven is realized.

The following describes the control method of the oven temperature at the angle of the continuous variation of the first temperature difference:

after the first internal temperature is greater than the set temperature, if the absolute value of the first temperature difference is always less than or equal to the third temperature threshold, maintaining the first PID parameter; after the first internal temperature is greater than the set temperature, if the absolute value of the first temperature difference value continues to increase until the absolute value of the first temperature difference value is greater than the third temperature threshold value and less than or equal to the first temperature threshold value, reducing the proportional parameter in the first PID parameter, maintaining the integral parameter in the first PID parameter unchanged, in which case, if the absolute value of the first temperature difference value is not greater than the first temperature threshold value all the time, continuing to control the internal temperature of the oven based on the PID controller that adjusts the PID parameter; after the first internal temperature is greater than the set temperature, if the absolute value of the first temperature difference value is continuously increased until the absolute value of the first temperature difference value is greater than the first temperature threshold value and less than or equal to the second temperature threshold value, reducing the proportional parameter in the first PID parameter, improving the integral parameter in the first PID parameter to obtain an adjusted PID parameter, controlling the internal temperature of the oven by a PID controller based on the adjusted PID parameter, and if the first internal temperature is always less than or equal to the second temperature threshold value, continuing to control the internal temperature of the oven by the PID controller based on the adjusted PID parameter; after the first internal temperature is greater than the set temperature, if the absolute value of the first temperature difference is continuously increased until the absolute value of the first temperature difference is greater than the first temperature threshold and less than or equal to the second temperature threshold, reducing the proportional parameter in the first PID parameter, increasing the integral parameter in the first PID parameter to obtain an adjusted PID parameter, controlling the internal temperature of the oven by a PID controller based on the adjusted PID parameter, if the first temperature difference is continuously increased until the first temperature difference is greater than the second temperature threshold, stopping reducing the proportional parameter in the first PID parameter, continuously increasing the integral parameter in the first PID parameter to obtain the adjusted PID parameter, and continuously controlling the internal temperature of the oven by the PID controller based on the adjusted PID parameter.

After the internal temperature of the oven is increased to be equal to the set temperature, the internal temperature of the oven is recorded as a first internal temperature, and the first internal temperature of the oven is continuously increased due to the characteristic of large hysteresis of temperature control, and the first temperature difference value between the first internal temperature and the set temperature is continuously increased; when the absolute value of the first temperature difference value is smaller, properly reducing the proportional parameter in the first PID parameter and increasing the integral parameter in the first PID parameter to obtain an adjusted PID parameter, and controlling the oven based on the adjusted PID parameter; if the first temperature difference value is not increased but gradually reduced in the control process, ending the adjustment process of the first PID parameter, so that the influence of the proportional term in the PID controller on the first internal temperature is reduced, the influence of the integral term in the PID controller on the first internal temperature is improved, the fluctuation is reduced, and the first internal temperature is quickly stabilized to the set temperature; if the first temperature difference value is continuously increased in the control process of the oven based on the adjusted PID parameters, the integral parameters in the adjusted PID parameters can be continuously increased, the proportion parameters in the adjusted PID parameters are stopped to be reduced, so that the influence of integral items in the PID controller on the first internal temperature is improved, the influence of the proportion items on the first internal temperature is maintained or improved, the overshoot is effectively restrained, the phenomenon of large fluctuation is reduced, and the internal temperature stability of the oven is improved. Therefore, under the condition that the requirements on the internal temperature stability of the oven are the same, the internal temperature stability of the oven is improved by adopting a mode of adjusting the first PID parameter according to the first temperature difference value, the requirement of the internal temperature stability of the oven on the PID parameter can be reduced, and the setting difficulty of the PID parameter is reduced.

Fig. 3 is a flow chart of a method for controlling oven temperature according to an embodiment of the present application. The control method of the oven temperature may be performed by a controller of the oven or may be performed by a server connected to the oven.

Referring to fig. 3, the control method of the oven temperature includes:

s301, under the condition that the internal temperature of the oven is increased to be greater than the set temperature for the first time, a first temperature difference value between the first internal temperature of the oven and the set temperature is obtained.

S302, obtaining a first PID parameter of a PID controller of the oven.

S303, obtaining an actual adjustment strategy corresponding to the first temperature difference value according to the corresponding relation between the temperature difference value and the PID parameter adjustment strategy.

Wherein, as the absolute value of the temperature difference increases, the proportional parameter in the PID parameter decreases and then increases, and the integral parameter in the PID parameter increases.

S304, adjusting the first PID parameter according to the actual adjustment strategy to obtain an adjusted PID parameter.

S305, configuring the adjusted PID parameters to the PID controller, so that the configured PID controller can continuously control the oven.

S306, obtaining a second temperature difference value between the second internal temperature of the oven and the set temperature under the condition that the internal temperature of the oven is not increased to be greater than the set temperature for the first time.

S307, obtaining a second PID parameter of the PID controller.

And S308, when the absolute value of the second temperature difference value is greater than or equal to the fourth temperature threshold value, reducing the proportion parameter in the second PID parameter according to the sixth regulating coefficient.

And determining the PID parameters with the proportion parameters reduced according to the sixth adjusting coefficient as adjusted PID parameters, and configuring the adjusted PID parameters to the PID controller so that the configured PID controller can continuously control the oven.

The fourth temperature threshold may be positively correlated with the set temperature, and for example, a product of the fourth coefficient and the set temperature may be determined as the fourth temperature threshold.

The fourth temperature threshold may be less than the third temperature threshold, in which case the fourth coefficient may be less than the third coefficient.

Under the condition that the internal temperature of the oven is larger than the set temperature for the first time, the amplitude of the internal temperature of the oven exceeding the set temperature is larger, so that the third temperature threshold is larger than the fourth temperature threshold, a certain overshoot can be maintained, the temperature return amount (the maximum value of the difference obtained by subtracting the internal temperature from the set temperature) of the internal temperature of the oven in the fluctuation stabilizing process is reduced, and the internal temperature stability of the oven is improved.

Correspondingly, under the condition that the internal temperature of the oven is not larger than the set temperature for the first time, the internal temperature of the oven is in a stabilizing process, so that the fourth temperature threshold value is smaller than the third temperature threshold value, the proportion parameter of the PID controller can be timely reduced, and the internal temperature of the oven is promoted to be stabilized to the set temperature as soon as possible (the temperature difference between the set temperature and the internal temperature is within a temperature dead zone range).

The reduction represented by the sixth adjustment coefficient may be smaller than the reduction represented by the fifth adjustment coefficient, where the reduction of the scale parameter in the first PID parameter and the reduction of the scale parameter in the second PID parameter are defined. The reduction amount represented by the fifth adjustment coefficient is larger, so that the condition that the overshoot is too large is reduced, and the internal temperature stability of the oven is improved (the excessive overshoot is not beneficial to the internal temperature stability of the oven). The sixth regulation coefficient shows smaller reduction, is favorable for reducing the proportion item of the PID controller along with the reduction of temperature fluctuation, reduces the condition that the PID controller cannot effectively control the temperature rise or the temperature reduction of the oven due to larger temperature difference, and improves the internal temperature stability of the oven.

Specifically, under the condition that the internal temperature of the oven is increased to be greater than the set temperature for the second time and more times, a second temperature difference value between the second internal temperature of the oven and the set temperature is obtained each time, a second PID parameter of the PID controller is obtained, and under the condition that the absolute value of the second temperature difference value is greater than or equal to a fourth temperature threshold value, the proportion parameter in the second PID parameter is reduced according to a sixth regulating coefficient each time.

By adopting the technical scheme, the internal temperature stability of the oven is improved.

Fig. 4 is a flow chart of a method for controlling oven temperature according to an embodiment of the present application. The control method of the oven temperature may be performed by a controller of the oven or may be performed by a server connected to the oven.

S401, after starting heating, obtaining a third internal temperature of the oven.

The third internal temperature herein refers to an internal temperature of the oven in a case where the internal temperature of the oven has not been equal to or greater than the set temperature for the first time during the temperature rising process of the oven, and is distinguished from the aforementioned first internal temperature and second internal temperature in that the temperature adjustment stage of the oven is different, and is herein distinguished as "third".

S402, obtaining a third temperature difference value between the set temperature and a third internal temperature of the oven.

S403, judging whether the absolute value of the third temperature difference value is smaller than a fifth temperature threshold value: if yes, S405 is executed, otherwise S404 is executed.

The fifth temperature threshold may be positively correlated with the set temperature, e.g., the product of the set temperature and the first coefficient is determined as the fifth temperature threshold; the first coefficient here may be 0.5 to 0.8, for example, the first coefficient may be 0.5, 0.6, 0.7 or 0.8.

The process is applied to the process of increasing the internal temperature of the oven, in which the absolute value of the third temperature difference gradually decreases, and the actual judgment conditions of the above steps are: and judging whether the absolute value of the third temperature difference is smaller than the fourth temperature difference and larger than or equal to a sixth temperature threshold under the condition that the third internal temperature is not larger than or equal to the set temperature for the first time.

The sixth temperature threshold value here may be smaller than the first temperature threshold value, and the sixth temperature threshold value may also be positively correlated with the set temperature, for example, the product of the set temperature and the second coefficient is determined as the sixth temperature threshold value; the second coefficient is smaller than the first coefficient, and the second coefficient may be 0.2 to 0.4, for example, the second coefficient may be 0.2, 0.3, or 0.4.

S404, adopting a proportional control strategy in the PID controller of the oven to enable the PID controller to control the oven according to the third temperature difference value.

The PID controller in the embodiment of the present application controls the oven according to the third temperature difference, which means that the third temperature difference is input into the PID controller, and the PID controller may output a control amount corresponding to the third temperature difference, and the control amount may act on a heating device of the oven to adjust heating power of the heating device.

S405, adopting a proportional control strategy in the PID controller of the oven to enable the PID controller to control the oven according to the third temperature difference value and accumulating the third temperature difference value.

Here, the third temperature difference is accumulated, that is, the third temperature difference is integrated.

S406, judging whether the absolute value of the third temperature difference value is smaller than a sixth temperature threshold value: if yes, then execute S407; otherwise, S405 is executed.

S407, on the basis of the accumulated third temperature difference value, adopting a proportional-integral-derivative control strategy in the PID controller, so that the PID controller controls the oven according to the third temperature difference value.

When the absolute value of the third temperature difference value is larger than the fifth temperature threshold value, the third internal temperature is lower, and in the PID controller, the influence of a proportion term (product of a proportion parameter and the temperature difference value) on the improvement of the third internal temperature is larger, and only a proportion control strategy is adopted to control the oven;

with the rise of the third internal temperature, when the absolute value of the third temperature difference value is smaller than or equal to the fifth temperature threshold value and larger than the sixth temperature threshold value, continuously adopting a proportional control strategy to control the oven, starting to accumulate the third temperature difference value, preparing for an integral control strategy, and under the condition, starting to accumulate the third temperature difference value, and discarding the condition that the third temperature difference value is larger, so that the value of the accumulated temperature difference value is smaller;

with the continuous rise of the third internal temperature, under the condition that the absolute value of the third temperature difference value is smaller than or equal to the sixth temperature threshold value, the effect of the proportional term in the PID controller on the rise of the third internal temperature is lower, and the effect of the integral term on the rise of the third internal temperature is higher because of the early accumulation of the temperature difference value, and the effect of the integral term on the rise of the third internal temperature is not excessive because of the rejection of the larger third temperature difference value (the condition that the absolute value of the third temperature difference value is larger than the fifth temperature threshold value); under the condition that the PID parameters are unchanged, the overshoot of the temperature of the oven can be reduced, the temperature stability of the oven is improved, the dependence of the temperature stability of the oven on the PID parameters is reduced, and the setting difficulty of the PID parameters is reduced.

S408, judging whether the internal temperature of the oven is larger than or equal to the set temperature for the first time or not under the condition that the internal temperature of the oven is larger than or equal to the set temperature: if yes, executing S409; otherwise, S414 is executed.

S409, obtaining a first temperature difference value between the first internal temperature of the oven and the set temperature.

S410, obtaining a first PID parameter of a PID controller of the oven.

S411, according to the corresponding relation between the temperature difference value and the PID parameter adjustment strategy, obtaining an actual adjustment strategy corresponding to the first temperature difference value.

S412, adjusting the first PID parameter according to the actual adjustment strategy to obtain an adjusted PID parameter.

S413, configuring the adjusted PID parameters to the PID controller, so that the configured PID controller can continuously control the oven. And then may jump to execution S408 (not shown in the figure).

S414, obtaining a second temperature difference value between the second internal temperature of the oven and the set temperature.

S415, obtaining a second PID parameter of the PID controller.

And S416, when the absolute value of the second temperature difference value is greater than or equal to the fourth temperature threshold value, reducing the proportion parameter in the second PID parameter according to the sixth regulating coefficient.

After the proportional parameters in the second PID parameters are reduced, configuring the adjusted second PID parameters to a PID controller, controlling the oven according to the configured PID controller, and jumping to S408, if the absolute value of the second temperature difference is still greater than or equal to the fourth temperature threshold, repeating S414, S415 and S416 until the absolute value of the second temperature difference is less than the fourth temperature threshold.

After the absolute value of the second temperature difference value is smaller than the fourth temperature threshold value, the temperature difference value between the internal temperature of the oven and the set temperature is gradually reduced to be within the temperature regulation dead zone range under the control of the PID controller. The embodiment of the application does not limit the specific numerical value of the temperature regulation dead zone, and in general, the smaller the range of the temperature regulation dead zone is, the higher the control accuracy of the temperature is, but the worse the temperature stability is; the greater the temperature adjustment dead zone, the lower the control accuracy of the temperature, but the better the temperature stability. Those skilled in the art can set a suitable temperature adjustment dead zone in combination with the requirements of practical application for control accuracy and temperature stability.

Under the condition that the internal temperature of the oven is lower than the set temperature, the oven is in a temperature rising process, under the condition that the internal temperature of the oven is higher than the set temperature for the first time, the oven is in a temperature stabilizing process, and in the process, the proportion parameter is reduced, so that the temperature stability of the oven can be improved.

Fig. 5 is a schematic diagram of an oven temperature control device according to an embodiment of the present application. Referring to fig. 5, the oven temperature control apparatus includes a first obtaining module 51, a second obtaining module 52, a third obtaining module 53, an adjusting module 54, and a configuration module 55.

The first obtaining module 51 is configured to obtain a first temperature difference between a first internal temperature of the oven and a set temperature when the internal temperature of the oven increases to be greater than the set temperature; the second obtaining module 52 is configured to obtain a first PID parameter of a PID controller of the oven; the third obtaining module 53 is configured to obtain an actual adjustment policy corresponding to the first temperature difference according to a correspondence between the temperature difference and the PID parameter adjustment policy; wherein, as the absolute value of the temperature difference increases, the proportion parameter in the PID parameter decreases and then increases, and the integral parameter in the PID parameter increases; the adjustment module 54 is configured to adjust the first PID parameter according to an actual adjustment policy, so as to obtain an adjusted PID parameter; the configuration module 55 is configured to configure the adjusted PID parameters to the PID controller, so that the configured PID controller continues to control the oven.

The third obtaining module 53 includes a first obtaining unit and a second obtaining unit; the first obtaining unit is used for determining that the proportion parameter in the first PID parameter is reduced according to the first adjusting coefficient and the integral parameter in the first PID parameter is increased according to the second adjusting coefficient as an actual adjusting strategy under the condition that the absolute value of the first temperature difference value is larger than the first temperature threshold and smaller than or equal to the second temperature threshold; the second obtaining unit is used for determining that the proportion parameter in the first PID parameter is increased according to the third adjusting coefficient and the integral parameter in the first PID parameter is increased according to the fourth adjusting coefficient as an actual adjusting strategy under the condition that the absolute value of the first temperature difference value is larger than the second temperature threshold value; wherein the integration parameter after the increase according to the fourth adjustment coefficient is larger than the integration parameter after the increase according to the second adjustment coefficient.

Optionally, increasing the integral parameter of the first PID parameter according to the second adjustment coefficient includes: and determining the product of the integral parameter in the first PID parameter and the second adjusting coefficient as the integral parameter in the adjusted PID parameter.

Optionally, increasing the integral parameter of the first PID parameter according to the fourth adjustment coefficient comprises: and determining the product of the integral parameter in the first PID parameter and the fourth regulating coefficient as the integral parameter in the regulated PID parameter.

Optionally, the third obtaining module 53 further includes a third obtaining unit, where the third obtaining unit is configured to determine, as the actual adjustment strategy, a proportional parameter in the first PID parameter reduced according to the fifth adjustment coefficient, in a case where the absolute value of the first temperature difference value is greater than the third temperature threshold and less than or equal to the first temperature threshold; in the event that the absolute value of the first temperature difference is less than or equal to the third temperature threshold, the first PID parameter determination actual tuning strategy will be maintained.

Optionally, the first obtaining module 51 includes a fourth obtaining unit for obtaining a first temperature difference between the first internal temperature of the oven and the set temperature in case that the internal temperature of the oven is first greater than the set temperature during the increase of the internal temperature of the oven.

The first obtaining module 51 further includes a fifth obtaining unit for obtaining a second temperature difference value between a second internal temperature of the oven and the set temperature in case that the internal temperature of the oven is not increased to be greater than the set temperature for the first time after the configured PID controller is caused to continue controlling the oven; obtaining a second PID parameter of the PID controller; and in the case that the absolute value of the second temperature difference value is greater than or equal to the fourth temperature threshold value, reducing the proportion parameter in the second PID parameter according to the sixth regulating coefficient.

In some embodiments, the control device of oven temperature includes a processor and a memory storing program instructions, the processor being configured to execute the control method of oven temperature provided by the previous embodiments when executing the program instructions.

Fig. 6 is a schematic diagram of an oven temperature control device according to an embodiment of the present application. Referring to fig. 6, the oven temperature control apparatus includes:

a processor (processor) 61 and a memory (memory) 62, and may also include a communication interface (Communication Interface) 63 and a bus 64. The processor 61, the communication interface 63, and the memory 62 may communicate with each other via the bus 64. The communication interface 63 may be used for information transfer. Processor 61 may invoke logic instructions in memory 62 to perform the oven temperature control method provided by the previous embodiments.

Further, the logic instructions in the memory 62 described above may be implemented in the form of software functional units and stored in a computer readable storage medium when sold or used as a stand alone product.

The memory 62 is a computer readable storage medium that can be used to store a software program, a computer executable program, such as program instructions/modules corresponding to the methods in the embodiments of the present application. The processor 61 executes functional applications and data processing by running software programs, instructions and modules stored in the memory 62, i.e. implements the methods of the method embodiments described above.

Memory 62 may include a storage program area that may store an operating system, at least one application program required for functionality, and a storage data area; the storage data area may store data created according to the use of the terminal device, etc. In addition, memory 62 may include high-speed random access memory, and may also include non-volatile memory.

The embodiment of the application provides an oven, which comprises the oven temperature control device provided by the embodiment.

The embodiment of the application provides a computer readable storage medium storing computer executable instructions configured to execute the oven temperature control method provided in the previous embodiment.

The present application provides a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the method of controlling oven temperature provided by the previous embodiments.

The computer readable storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.

The technical solutions of the embodiments of the present application may be embodied in the form of a software product, where the software product is stored in a storage medium, and includes one or more instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium may be a non-transitory storage medium including: a plurality of media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or a transitory storage medium.

The above description and the drawings illustrate embodiments of the present application sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when used in this application, the terms "comprises," "comprising," and/or "includes," and variations thereof, mean that the stated features, integers, steps, operations, elements, and/or components are present, but that the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.

Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. The skilled person may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present application. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.

In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements may be merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims (10)

1. A method of controlling the temperature of an oven, comprising:

obtaining a first temperature difference between a first internal temperature of an oven and a set temperature when the internal temperature of the oven increases to be greater than the set temperature;

Obtaining a first PID parameter of a PID controller of the oven;

obtaining an actual adjustment strategy corresponding to the first temperature difference value according to the corresponding relation between the temperature difference value and the PID parameter adjustment strategy; wherein, as the absolute value of the temperature difference increases, the proportional parameter in the PID parameter is firstly reduced and then stops to be reduced, and the integral parameter in the PID parameter is increased;

adjusting the first PID parameter according to the actual adjustment strategy to obtain an adjusted PID parameter;

and configuring the adjusted PID parameters to the PID controller, so that the configured PID controller continues to control the oven.

2. The control method according to claim 1, wherein obtaining an actual adjustment strategy corresponding to the first temperature difference value according to a correspondence between temperature difference values and PID parameter adjustment strategies, comprises:

when the absolute value of the first temperature difference value is larger than a first temperature threshold value and smaller than or equal to a second temperature threshold value, reducing the proportion parameter in the first PID parameter according to a first adjusting coefficient, and increasing the integral parameter in the first PID parameter according to a second adjusting coefficient, so as to determine the actual adjusting strategy;

when the absolute value of the first temperature difference value is larger than a second temperature threshold value, increasing the proportional parameter in the first PID parameter according to a third adjusting coefficient, and increasing the integral parameter in the first PID parameter according to a fourth adjusting coefficient, so as to determine the actual adjusting strategy;

Wherein the integration parameter after the increase according to the fourth adjustment coefficient is larger than the integration parameter after the increase according to the second adjustment coefficient.

3. The control method according to claim 2, wherein increasing the integral parameter of the first PID parameter in accordance with the second adjustment coefficient includes: and determining the product of the integral parameter in the first PID parameter and the second regulating coefficient as the integral parameter in the regulated PID parameter.

4. A control method according to claim 3, wherein increasing the integral parameter of the first PID parameter according to a fourth adjustment coefficient comprises:

and determining the product of the integral parameter in the first PID parameter and the fourth regulating coefficient as the integral parameter in the regulated PID parameter.

5. The control method according to claim 2, characterized by further comprising:

determining a proportional parameter of the first PID parameter reduced according to a fifth adjustment coefficient as the actual adjustment strategy when the absolute value of the first temperature difference is greater than a third temperature threshold and less than or equal to the first temperature threshold;

in the event that the absolute value of the first temperature difference is less than or equal to a third temperature threshold, the first PID parameter will be maintained to determine the actual tuning strategy.

6. The control method according to any one of claims 1 to 5, characterized in that in the case where the internal temperature of the oven is raised to be greater than a set temperature, obtaining a first temperature difference of the first internal temperature of the oven from the set temperature, comprises:

and in the process of increasing the internal temperature of the oven, under the condition that the internal temperature is larger than the set temperature for the first time, obtaining a first temperature difference value between the first internal temperature of the oven and the set temperature.

7. The control method according to claim 6, characterized by further comprising, after causing the configured PID controller to continue controlling the oven:

obtaining a second temperature difference between a second internal temperature of the oven and the set temperature if the internal temperature of the oven is not first increased to be greater than the set temperature;

obtaining a second PID parameter of the PID controller;

and reducing the proportion parameter in the second PID parameter according to a sixth regulating coefficient under the condition that the absolute value of the second temperature difference value is larger than or equal to a fourth temperature threshold value.

8. A control device for oven temperature, comprising:

a first obtaining module for obtaining a first temperature difference between a first internal temperature of an oven and a set temperature in case the internal temperature of the oven increases to be greater than the set temperature;

The second obtaining module is used for obtaining the first PID parameters of the PID controller of the oven;

the third obtaining module is used for obtaining an actual adjustment strategy corresponding to the first temperature difference value according to the corresponding relation between the temperature difference value and the PID parameter adjustment strategy; wherein, as the absolute value of the temperature difference increases, the proportional parameter in the PID parameter is firstly reduced and then stops to be reduced, and the integral parameter in the PID parameter is increased;

the adjusting module is used for adjusting the first PID parameter according to the actual adjusting strategy to obtain an adjusted PID parameter;

and the configuration module is used for configuring the adjusted PID parameters to the PID controller, so that the configured PID controller can continuously control the oven.

9. A control device for oven temperature comprising a processor and a memory storing program instructions, characterized in that the processor is configured to execute the control method for oven temperature according to any one of claims 1 to 7 when executing the program instructions.

10. An oven comprising a control device for controlling the temperature of the oven according to claim 8 or 9.