CN116439582A - 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 control method of the oven temperature comprises the following steps: when the internal temperature of the oven starts to rise, a proportional control strategy is adopted in a PID controller of the oven, an integral control strategy is not adopted, and a first temperature difference value is not accumulated; with the increase of the internal temperature of the oven, adopting a proportional control strategy in a PID controller of the oven, and accumulating a first temperature difference value without adopting an integral control strategy; and finally, adopting a proportional control strategy in PID control of the oven and adopting an integral control strategy on the basis of the accumulated temperature difference value along with the increase of the internal temperature of the oven. The temperature stability of the oven can be improved by adopting the control method of the temperature of the oven, the dependence of the temperature stability of the oven on PID parameters is reduced, and the setting difficulty of the PID parameters is reduced. 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 temperature of the oven may be as high as 200 c or higher, and during heating of the oven, the 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 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, so that the dependence of the temperature stability of the oven on PID parameters is reduced and the setting difficulty of the PID parameters of a PID controller is reduced by adopting different heating strategies at different stages.

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 if the internal temperature of the oven increases and is less than the set temperature; when the absolute value of the first temperature difference value is larger than a first temperature threshold value, adopting a proportional control strategy in a PID controller of the oven, and not adopting an integral control strategy, and not accumulating the first temperature difference value; when the absolute value of the first temperature difference value is smaller than or equal to a first temperature threshold value and larger than a second temperature threshold value, adopting a proportional control strategy in a PID controller of the oven, and accumulating the first temperature difference value without adopting an integral control strategy; in the case where the absolute value of the first temperature difference is less than or equal to a second temperature threshold, a proportional control strategy is employed in PID control of the oven, and an integral control strategy is employed based on the accumulated temperature difference.

Optionally, the control method of the oven temperature further comprises: obtaining PID parameters of the PID controller under the condition that the internal temperature of the oven is greater than the set temperature; reducing the proportion parameters in the PID parameters to obtain adjusted PID parameters; and configuring the adjusted PID parameters to the PID controller, so that the configured PID controller continues to control the oven.

Optionally, reducing the proportional parameter in the PID parameters to obtain adjusted PID parameters, including: obtaining a second temperature difference between a second internal temperature of the oven and the set temperature; if the absolute value of the second temperature difference value is larger than or equal to a third temperature threshold value under the condition that the internal temperature of the oven is larger than the set temperature for the first time, reducing the proportion parameter in the PID parameters to obtain adjusted PID parameters; if the absolute value of the second temperature difference value is larger than or equal to a fourth temperature threshold value under the condition that the internal temperature of the oven is not larger than the set temperature for the first time, reducing the proportion parameter in the PID parameters to obtain adjusted PID parameters; wherein the third temperature threshold is greater than the fourth temperature threshold.

Optionally, if the absolute value of the second temperature difference value is greater than or equal to a third temperature threshold value, reducing the proportion parameter in the PID parameter according to a first adjusting coefficient to obtain an adjusted PID parameter; if the absolute value of the second temperature difference value is larger than or equal to a fourth temperature threshold value, reducing the proportion parameter in the PID parameter according to a second adjusting coefficient to obtain an adjusted PID parameter; wherein the first adjustment factor represents a greater amount of reduction than the second adjustment factor.

Optionally, reducing the proportional parameter in the PID parameters according to a first adjustment coefficient to obtain adjusted PID parameters, including: and determining the product of the proportional parameter in the PID parameter and the first regulating coefficient as the proportional parameter in the regulated PID parameter.

Optionally, reducing the proportional parameter in the PID parameter according to a second adjustment coefficient to obtain an adjusted PID parameter, including: and determining the product of the proportional parameter in the PID parameter and the second regulating coefficient as the proportional parameter in the regulated PID parameter.

Optionally, the control method of the oven temperature further comprises: if the absolute value of the second temperature difference value is larger than a fifth temperature threshold value under the condition that the internal temperature of the oven is larger than the set temperature for the first time, reducing the proportion parameter in the PID parameter according to a third adjusting coefficient, and increasing the integral parameter in the PID parameter according to a fourth adjusting coefficient to obtain the integral parameter in the adjusted PID parameter; the fifth temperature threshold is greater than the third temperature threshold.

Optionally, the control method of the oven temperature further comprises: if the absolute value of the second temperature difference value is larger than a sixth temperature threshold value under the condition that the internal temperature of the oven is larger than the set temperature for the first time, increasing the proportional parameter in the PID parameter according to a fifth adjusting coefficient, and increasing the integral parameter in the PID parameter according to a sixth adjusting coefficient to obtain the integral parameter in the adjusted PID parameter; the sixth temperature threshold is greater than the fifth temperature threshold.

In some embodiments, the control device of the oven temperature comprises a first obtaining module, a first control module, a second control module and a third control module, wherein the first obtaining module is used for obtaining a first temperature difference value between a first internal temperature of the oven and a set temperature when the internal temperature of the oven is increased and is smaller than the set temperature; the first control module is used for adopting a proportional control strategy in a PID controller of the oven under the condition that the absolute value of the first temperature difference value is larger than a first temperature threshold value, and not adopting an integral control strategy, and not accumulating the first temperature difference value; the second control module is used for accumulating the first temperature difference value by adopting a proportional control strategy in a PID controller of the oven without adopting an integral control strategy under the condition that the absolute value of the first temperature difference value is smaller than or equal to a first temperature threshold value and is larger than a second temperature threshold value; the third control module is used for adopting a proportional control strategy in PID control of the oven and adopting an integral control strategy on the basis of the accumulated temperature difference value under the condition that the absolute value of the first temperature difference value is smaller than or equal to a second temperature threshold value.

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:

when the absolute value of the first temperature difference value is larger than the first temperature threshold value, the first 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 first internal temperature is larger, and only a proportion control strategy is adopted to control the oven;

with the rise of the first internal temperature, under the condition that the absolute value of the first temperature difference value is smaller than or equal to the first temperature threshold value and larger than the second temperature threshold value, continuously adopting a proportional control strategy to control the oven, but starting to accumulate the first temperature difference value to prepare for an integral control strategy, and under the condition that the first temperature difference value is not accumulated until the first temperature difference value is larger, discarding the condition that the first temperature difference value is larger, so that the value of the accumulated temperature difference value is smaller;

With the continuous rising of the first internal temperature, under the condition that the absolute value of the first temperature difference value is smaller than or equal to the second temperature threshold value, the effect of the proportional term in the PID controller on the rising of the first internal temperature is lower, and the effect of the integral term on the rising of the first internal temperature is higher because the temperature difference value is accumulated in advance, and the effect of the integral term on the rising of the first internal temperature is not excessive because the larger first temperature difference value (the condition that the absolute value of the first temperature difference value is larger than the first temperature threshold value) is abandoned; 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.

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 flow chart of a method for controlling oven temperature according to 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 diagram of the internal temperature of an oven over time provided in an embodiment of the present application;

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

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.

In the embodiment of the application, the PID controller refers to a controller with a proportional control strategy, an integral control strategy and a differential control strategy. In the actual work of the PID controller, the PID controller can adopt a pure proportional control strategy, and does not adopt an integral control strategy and a differential control strategy, for example, the integral parameter and the differential parameter of the PID controller can be set to be zero, and the proportional parameter of the PID controller is normally configured; the PID controller can adopt a proportional-integral control strategy, and does not adopt a differential control strategy, for example, the proportional parameter and the integral parameter of the PID controller can be normally configured, and the differential parameter is set to be zero; the PID controller can adopt a proportional-derivative control strategy, and an integral controller is not adopted, for example, the proportional parameter and the derivative parameter of the PID controller can be normally configured, and the integral parameter is set to be zero; alternatively, the PID controller can employ a proportional-integral-derivative control strategy simultaneously, e.g., the proportional, integral, and derivative parameters of the PID controller are normally configured.

Fig. 1 is a flow chart of a method for controlling oven temperature according to an embodiment of the present application. In the process of improving the internal temperature of the oven, a proportional control strategy is adopted firstly, a differential control strategy is not adopted, and the temperature difference value between the set temperature and the internal temperature is not integrated; as the internal temperature of the oven continues to increase (the internal temperature is lower than the set temperature), a proportional control strategy is still adopted, an integral control strategy is not adopted, and the temperature difference between the set temperature and the internal temperature starts to be integrated; as the oven internal temperature increases further (the internal temperature is still below the set temperature), a proportional control strategy and an integral control strategy are employed. The influence of the excessive temperature difference on the integral action of the PID controller is reduced, but when the temperature difference is smaller, the temperature inside the oven has a better rising rate, so that the temperature stability of the oven is improved in the control strategy layer by adopting different control strategies in different heating stages, and the dependence of the stability of the oven on 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 to which the oven is connected.

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

s201, when the internal temperature of the oven is increased and smaller 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.

S202, under the condition that the absolute value of the first temperature difference value is larger than a first temperature threshold value, adopting a proportional control strategy in a PID controller of the oven, and not adopting an integral control strategy, and not accumulating the first temperature difference value.

For example, the proportional parameters of the PID controller are assigned by the set proportional parameters, and the integral parameters of the PID controller are assigned by zero.

The PID controller can be a pure proportional control strategy, namely, the proportional parameters of the PID controller are assigned by using the well-set proportional parameters, and the integral parameters and the differential parameters of the PID controller are assigned by using zero.

Alternatively, the PID controller may be a proportional-derivative controller, i.e., the proportional and derivative parameters of the PID controller are assigned with the set proportional and derivative parameters, and the integral parameters of the PID controller are assigned with zero.

The first 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 first 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.

S203, under the condition that the absolute value of the first temperature difference value is smaller than or equal to the first temperature threshold value and is larger than the second temperature threshold value, adopting a proportional control strategy in a PID controller of the oven, and accumulating the first temperature difference value without adopting an integral control strategy.

The accumulation of the first temperature difference is started in this step, i.e. preparation is started for the integral term of the PID controller (integral term being the product of the integral parameter and the accumulated temperature difference).

The first temperature difference is accumulated in this step, and the first temperature difference having a larger absolute value is discarded, so that the accumulated temperature difference is smaller.

The second temperature threshold is smaller than the first temperature threshold, and the second temperature threshold can be positively correlated with the set temperature, for example, the product of the set temperature and the second coefficient is determined as the second temperature threshold; 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.

S204, adopting a proportional control strategy in PID control of the oven and adopting an integral control strategy on the basis of the accumulated temperature difference value in the case that the absolute value of the first temperature difference value is smaller than or equal to the second temperature threshold value.

That is, in this step, the integral parameter of the PID control is assigned with the set integral parameter, and the proportional parameter in the PID controller is maintained.

The accumulated temperature difference here refers to the accumulated first temperature difference in the case where the absolute value of the first temperature difference is less than or equal to the first temperature threshold and greater than the second temperature threshold.

And adopting an integral control strategy on the basis of the accumulated temperature difference value, namely continuously accumulating the first temperature difference value under the condition that the absolute value of the first temperature difference value is smaller than or equal to the second temperature threshold value, calculating the sum of the continuously accumulated first temperature difference value and the accumulated temperature difference value, calculating the product of the sum and an integral parameter, and determining the product as an integral term.

Also, in this step, a differential control strategy may or may not still be employed, as embodiments of the present application are not specifically limited.

When the absolute value of the first temperature difference is larger than the first temperature threshold, the first internal temperature is lower, and the proportional term has larger influence on the improvement of the first internal temperature in the PID controller, so that the oven is controlled by adopting a proportional control strategy only.

With the rise of the first internal temperature, when the absolute value of the first temperature difference is smaller than or equal to the first temperature threshold and larger than the second temperature threshold, the proportional control strategy is continuously adopted to control the oven, but the first temperature difference is started to be accumulated, so that preparation is made for the integral control strategy, the first temperature difference is started to be accumulated under the condition, and the condition that the first temperature difference is larger is abandoned, so that the value of the accumulated temperature difference is smaller.

With the continuous rising of the first internal temperature, under the condition that the absolute value of the first temperature difference value is smaller than or equal to the second temperature threshold value, the effect of the proportional term in the PID controller on the rising of the first internal temperature is lower, and the effect of the integral term on the rising of the first internal temperature is higher because the temperature difference value is accumulated in advance, and the effect of the integral term on the rising of the first internal temperature is not excessive because the larger first temperature difference value (the condition that the absolute value of the first temperature difference value is larger than the first temperature threshold value) is abandoned; 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, and the dependence of the temperature stability of the oven on the PID parameters 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 to which the oven is connected.

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

s301, obtaining a first temperature difference value between the first internal temperature of the oven and the set temperature when the internal temperature of the oven is increased and smaller than the set temperature.

S302, under the condition that the absolute value of the first temperature difference value is larger than a first temperature threshold value, adopting a proportional control strategy in a PID controller of the oven, and not adopting an integral control strategy, and not accumulating the first temperature difference value.

S303, under the condition that the absolute value of the first temperature difference value is smaller than or equal to the first temperature threshold value and is larger than the second temperature threshold value, adopting a proportional control strategy in a PID controller of the oven, and accumulating the first temperature difference value without adopting an integral control strategy.

S304, adopting a proportional control strategy in PID control of the oven and adopting an integral control strategy on the basis of the accumulated temperature difference value when the absolute value of the first temperature difference value is smaller than or equal to the second temperature threshold value.

S305, obtaining the PID parameters of the PID controller under the condition that the internal temperature of the oven is larger than the set temperature.

The PID parameters of the PID controller can be read directly, or the stored and set PID parameters can be read directly.

S306, reducing the proportion parameters in the PID parameters to obtain the adjusted PID parameters.

Optionally, reducing the proportional parameter in the PID parameters to obtain adjusted PID parameters includes: obtaining a second temperature difference between a second internal temperature of the oven and the set temperature;

if the absolute value of the second temperature difference value is larger than or equal to a third temperature threshold value under the condition that the internal temperature of the oven is larger than the set temperature for the first time, reducing the proportion parameter in the PID parameter to obtain an adjusted PID parameter;

if the absolute value of the second temperature difference value is larger than or equal to the fourth temperature threshold value under the condition that the internal temperature of the oven is not larger than the set temperature for the first time, reducing the proportion parameter in the PID parameters to obtain the adjusted PID parameters; wherein the third temperature threshold is greater than the fourth temperature threshold.

The third temperature threshold and the fourth 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 third temperature threshold and the fourth temperature threshold; the lower the requirement for internal temperature stability, the greater both the third and fourth temperature thresholds.

In particular, the third temperature threshold may be positively correlated with the set temperature, e.g., a product of the third coefficient and the set temperature may be determined as the third temperature threshold. The fourth temperature threshold may be positively correlated with the set temperature, e.g., a product of the fourth coefficient and the set temperature may be determined as the fourth temperature threshold. The higher the requirement for the internal temperature stability of the oven, the greater the third and fourth coefficients, and the lower the requirement for the internal temperature stability of the oven, the smaller the third and fourth coefficients.

The technical effects of the above technical solution are exemplarily described with reference to fig. 4: when the internal temperature of the oven is larger than the set temperature Ts for the first time, the range of the internal temperature of the oven exceeding the set temperature is larger, for example, the overshoot DeltaT 1 is larger, so that the third temperature threshold is larger than the fourth temperature threshold, a certain overshoot DeltaT 1 can be maintained, the temperature return DeltaT 2 of the internal temperature of the oven in the fluctuation stabilizing process is reduced, and the 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).

Further, if the absolute value of the second temperature difference value is greater than or equal to the third temperature threshold value, reducing the proportion parameter in the PID parameter according to the first adjusting coefficient to obtain an adjusted PID parameter; if the absolute value of the second temperature difference value is larger than or equal to the fourth temperature threshold value, reducing the proportion parameter in the PID parameter according to the second adjusting coefficient to obtain an adjusted PID parameter; wherein the first adjustment factor represents a greater amount of reduction than the second adjustment factor.

The reduction of the proportion parameter in the PID parameter is limited, and the reduction represented by the first adjusting coefficient is larger, so that the condition that the overshoot is too large is reduced, and the temperature stability of the oven is improved (the excessive overshoot is not beneficial to the temperature stability of the oven). The reduction that the second governing coefficient represents is less, is favorable to making the proportional term of PID controller reduce along with the reduction of temperature fluctuation, reduces and appears the temperature difference great and the condition that the PID controller can't effectively control the oven to heat up or cool down, has improved the temperature stability of oven.

Specifically, reducing the proportional parameter in the PID parameter according to the first adjustment coefficient to obtain the adjusted PID parameter may include: and determining the product of the proportional parameter in the PID parameter and the first regulating coefficient as the proportional parameter in the regulated PID parameter. Reducing the proportional parameter in the PID parameter according to the second adjustment coefficient to obtain an adjusted PID parameter, which may include: and determining the product of the proportional parameter in the PID parameter and the second regulating coefficient as the proportional parameter in the regulated PID parameter. Wherein the first adjustment factor is greater than the second adjustment factor.

According to the mode, the adjusted PID parameters can be obtained.

Optionally, the control method of the oven temperature further comprises: if the absolute value of the second temperature difference value is larger than a fifth temperature threshold value, reducing the proportion parameter in the PID parameter according to a third adjusting coefficient, and increasing the integral parameter in the PID parameter according to a fourth adjusting coefficient to obtain the integral parameter in the adjusted PID parameter; the fifth temperature threshold is greater than the third temperature threshold.

The proportional parameter in the PID parameter reduced according to the third adjustment coefficient is smaller than the proportional parameter in the PID parameter reduced according to the first adjustment coefficient.

The proportional parameter in the PID parameter is reduced according to the third adjustment coefficient, which comprises two cases:

in the case where the proportional parameter in the PID parameter is the proportional parameter before the decrease by the first adjustment coefficient, the product of the proportional parameter in the PID parameter and the third adjustment coefficient may be determined as the proportional parameter in the adjusted PID parameter, the third adjustment coefficient being smaller than the first adjustment coefficient;

in the case where the proportional parameter in the PID parameter is the proportional parameter after the decrease by the first adjustment coefficient, the product of the proportional parameter in the PID parameter and the third adjustment coefficient, which is smaller than 1 and has no necessary magnitude relation with the first adjustment coefficient, may be determined as the proportional parameter in the adjusted positive PID parameter.

The product of the integral parameter of the PID parameters and the fourth adjustment coefficient may be determined as the integral parameter of the adjusted PID parameters. Wherein the fourth adjustment factor is greater than 1.

Optionally, the control method of the oven temperature further comprises: and under the condition that the internal temperature of the oven is larger than the set temperature for the first time, if the absolute value of the second temperature difference value is larger than the sixth temperature threshold value, increasing the proportional parameter in the PID parameter according to the fifth adjusting coefficient, and increasing the integral parameter in the PID parameter according to the sixth adjusting coefficient to obtain the integral parameter in the adjusted PID parameter.

In the case where the proportion parameter in the PID parameters is unregulated, the product of the proportion parameter in the PID parameters and a fifth regulation coefficient may be determined as the proportion parameter in the regulated PID parameters, where the fifth regulation coefficient may be greater than or equal to the third regulation coefficient; in the case that the fifth adjustment coefficient is greater than the third adjustment coefficient, it means that the proportional parameter in the PID parameter is increased as the absolute value of the second temperature difference increases, and in the case that the fifth adjustment coefficient is equal to the third adjustment coefficient, it means that the proportional parameter in the PID parameter is not decreased but maintained as the absolute value of the second temperature difference increases.

In the case where the proportion parameter in the PID parameters is adjusted, the product of the proportion parameter in the PID parameters and the fifth adjustment coefficient may be determined as the proportion parameter in the adjusted PID parameters, where the third adjustment coefficient may be a coefficient greater than or equal to 1; in case the fifth adjustment parameter is greater than 1, it means that the proportional parameter in the PID parameter is increased as the absolute value of the second temperature difference increases, and in case the fifth adjustment parameter is equal to 1, it means that the proportional parameter in the PID parameter is not decreased but maintained as the absolute value of the second temperature difference increases.

The integral parameter in the PID parameter after the increase according to the sixth adjustment coefficient is greater than or equal to the integral parameter in the PID parameter after the increase according to the fourth adjustment coefficient.

In the case where the integral parameter of the PID parameters is unregulated, the product of the proportional parameter of the PID parameters and a sixth regulation coefficient, which is greater than or equal to the fourth regulation coefficient, may be determined as the integral parameter of the regulated PID parameters.

Where the integral parameter of the PID parameters is an adjusted integral parameter of the PID parameters, the product of the integral parameter of the PID parameters and a sixth adjustment coefficient, which may be a coefficient greater than or equal to 1, may be determined as the integral parameter of the adjusted PID parameters.

S307, 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.

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 a control device for oven temperature according to an embodiment of the present application. The control device of the oven temperature can be realized by software, hardware or a combination of the software and the hardware.

Referring to fig. 5, the oven temperature control apparatus includes a first obtaining module 51, a first control module 52, a second control module 53, and a third control module 54; 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 and is less than the set temperature; the first control module 52 is configured to employ a proportional control strategy in the PID controller of the oven, and not employ an integral control strategy, and not accumulate the first temperature difference if the absolute value of the first temperature difference is greater than the first temperature threshold; the second control module 53 accumulates the first temperature difference value by adopting a proportional control strategy in the PID controller of the oven without adopting an integral control strategy when the absolute value of the first temperature difference value is less than or equal to the first temperature threshold value and greater than the second temperature threshold value; the third control module 54 is configured to employ a proportional control strategy in PID control of the oven and an integral control strategy based on the accumulated temperature difference in the event that the absolute value of the first temperature difference is less than or equal to the second temperature threshold.

Optionally, the control device of the oven temperature further comprises a second obtaining module, a third obtaining module and a configuration module, wherein the second obtaining module is used for obtaining the PID parameter of the PID controller when the internal temperature of the oven is greater than the set temperature; the third obtaining module is used for reducing the proportion parameters in the PID parameters and obtaining adjusted PID parameters; 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.

Optionally, the third obtaining module includes a first obtaining unit, a second obtaining unit and a third obtaining unit, where the first obtaining unit is configured to obtain a second internal temperature of the oven and a second temperature difference value of the set temperature, and the second obtaining unit is configured to reduce a proportion parameter in the PID parameter if an absolute value of the second temperature difference value is greater than or equal to a third temperature threshold value in a case where the internal temperature of the oven is greater than the set temperature for the first time, and obtain an adjusted PID parameter; the third obtaining unit is used for reducing the proportion parameter in the PID parameter to obtain the adjusted PID parameter if the absolute value of the second temperature difference value is larger than or equal to the fourth temperature threshold value under the condition that the internal temperature of the oven is not larger than the set temperature for the first time; wherein the third temperature threshold is greater than the fourth temperature threshold.

Optionally, the second obtaining unit is specifically configured to reduce the proportion parameter in the PID parameters according to the first adjustment coefficient if the absolute value of the second temperature difference value is greater than or equal to the third temperature threshold value, so as to obtain the adjusted PID parameters; the third obtaining unit is specifically configured to reduce a proportion parameter in the PID parameters according to the second adjustment coefficient if the absolute value of the second temperature difference value is greater than or equal to the fourth temperature threshold value, so as to obtain an adjusted PID parameter; wherein the first adjustment factor represents a greater amount of reduction than the second adjustment factor.

Optionally, the second obtaining unit is specifically configured to determine a product of the proportional parameter in the PID parameter and the first adjustment coefficient as the proportional parameter in the adjusted PID parameter.

Optionally, the third obtaining unit is specifically configured to determine a product of the proportional parameter in the PID parameter and the second adjustment coefficient as the proportional parameter in the adjusted PID parameter.

Optionally, the control device of the oven temperature further includes a fourth obtaining module, configured to, if the internal temperature of the oven is greater than the set temperature for the first time, decrease the proportional parameter in the PID parameter according to the third adjustment coefficient and increase the integral parameter in the PID parameter according to the fourth adjustment coefficient if the absolute value of the second temperature difference is greater than the fifth temperature threshold, so as to obtain the integral parameter in the adjusted PID parameter; the fifth temperature threshold is greater than the third temperature threshold.

Optionally, the control device of the oven temperature further includes a fifth obtaining module, configured to increase the proportional parameter in the PID parameter according to the fifth adjustment coefficient and increase the integral parameter in the PID parameter according to the sixth adjustment coefficient if the absolute value of the second temperature difference value is greater than the sixth temperature threshold value in the case that the internal temperature of the oven is greater than the set temperature for the first time, to obtain the integral parameter in the adjusted PID parameter; the sixth temperature threshold is greater than the fifth temperature threshold.

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 if the internal temperature of the oven increases and is less than the set temperature;

When the absolute value of the first temperature difference value is larger than a first temperature threshold value, adopting a proportional control strategy in a PID controller of the oven, and not adopting an integral control strategy, and not accumulating the first temperature difference value;

when the absolute value of the first temperature difference value is smaller than or equal to a first temperature threshold value and larger than a second temperature threshold value, adopting a proportional control strategy in a PID controller of the oven, and accumulating the first temperature difference value without adopting an integral control strategy;

in the case where the absolute value of the first temperature difference is less than or equal to a second temperature threshold, a proportional control strategy is employed in PID control of the oven, and an integral control strategy is employed based on the accumulated temperature difference.

2. The control method according to claim 1, characterized by further comprising:

obtaining PID parameters of the PID controller under the condition that the internal temperature of the oven is greater than the set temperature;

reducing the proportion parameters in the PID parameters to obtain adjusted PID parameters;

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

3. The control method according to claim 2, wherein reducing the proportional parameter among the PID parameters to obtain the adjusted PID parameter includes:

Obtaining a second temperature difference between a second internal temperature of the oven and the set temperature;

if the absolute value of the second temperature difference value is larger than or equal to a third temperature threshold value under the condition that the internal temperature of the oven is larger than the set temperature for the first time, reducing the proportion parameter in the PID parameters to obtain adjusted PID parameters;

if the absolute value of the second temperature difference value is larger than or equal to a fourth temperature threshold value under the condition that the internal temperature of the oven is not larger than the set temperature for the first time, reducing the proportion parameter in the PID parameters to obtain adjusted PID parameters;

wherein the third temperature threshold is greater than the fourth temperature threshold.

4. The control method according to claim 3, wherein,

if the absolute value of the second temperature difference value is larger than or equal to a third temperature threshold value, reducing the proportion parameter in the PID parameter according to a first adjusting coefficient to obtain an adjusted PID parameter;

if the absolute value of the second temperature difference value is larger than or equal to a fourth temperature threshold value, reducing the proportion parameter in the PID parameter according to a second adjusting coefficient to obtain an adjusted PID parameter;

wherein the first adjustment factor represents a greater amount of reduction than the second adjustment factor.

5. The control method according to claim 4, wherein,

reducing the proportion parameter in the PID parameter according to a first adjusting coefficient to obtain an adjusted PID parameter, comprising: determining the product of the proportional parameter in the PID parameter and the first adjusting coefficient as the proportional parameter in the adjusted PID parameter;

and reducing the proportion parameters in the PID parameters according to a second regulating coefficient to obtain regulated PID parameters, wherein the method comprises the following steps of: and determining the product of the proportional parameter in the PID parameter and the second regulating coefficient as the proportional parameter in the regulated PID parameter.

6. A control method according to claim 3, characterized by further comprising:

if the absolute value of the second temperature difference value is larger than a fifth temperature threshold value under the condition that the internal temperature of the oven is larger than the set temperature for the first time, reducing the proportion parameter in the PID parameter according to a third adjusting coefficient, and increasing the integral parameter in the PID parameter according to a fourth adjusting coefficient to obtain the integral parameter in the adjusted PID parameter;

the fifth temperature threshold is greater than the third temperature threshold.

7. The control method according to claim 6, characterized by further comprising:

If the absolute value of the second temperature difference value is larger than a sixth temperature threshold value under the condition that the internal temperature of the oven is larger than the set temperature for the first time, increasing the proportional parameter in the PID parameter according to a fifth adjusting coefficient, and increasing the integral parameter in the PID parameter according to a sixth adjusting coefficient to obtain the integral parameter in the adjusted PID parameter;

the sixth temperature threshold is greater than the fifth temperature threshold.

8. A control device for oven temperature, comprising:

a first obtaining module for obtaining a first temperature difference value between a first internal temperature of an oven and a set temperature in case that the internal temperature of the oven is increased and less than the set temperature;

the first control module is used for adopting a proportional control strategy in a PID controller of the oven, not adopting an integral control strategy and not accumulating the first temperature difference value under the condition that the absolute value of the first temperature difference value is larger than a first temperature threshold value;

the second control module is used for accumulating the first temperature difference value by adopting a proportional control strategy in a PID controller of the oven without adopting an integral control strategy under the condition that the absolute value of the first temperature difference value is smaller than or equal to a first temperature threshold value and is larger than a second temperature threshold value;

And the third control module is used for adopting a proportional control strategy in PID control of the oven and adopting an integral control strategy on the basis of the accumulated temperature difference value under the condition that the absolute value of the first temperature difference value is smaller than or equal to the second temperature threshold value.

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.