CN112773212A - Oven temperature control method and device, oven and storage medium - Google Patents
Oven temperature control method and device, oven and storage medium Download PDFInfo
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- CN112773212A CN112773212A CN202011591153.XA CN202011591153A CN112773212A CN 112773212 A CN112773212 A CN 112773212A CN 202011591153 A CN202011591153 A CN 202011591153A CN 112773212 A CN112773212 A CN 112773212A
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J37/00—Baking; Roasting; Grilling; Frying
- A47J37/06—Roasters; Grills; Sandwich grills
- A47J37/0623—Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity
- A47J37/0629—Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity with electric heating elements
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Abstract
The invention is suitable for the field of ovens, and provides an oven temperature control method, which comprises the following steps: s1, acquiring the current temperature inside the oven, and calculating the difference between the current temperature and the set temperature; s2, calculating the on-off time ratio of the heating pipe according to the difference; s3, controlling the heating pipe to be turned on and turned off according to the on-off time ratio of the heating pipe, and obtaining the current temperature when the heating pipe is turned off; s4, judging whether the current temperature is stable; if yes, go to step S5; if not, go to step S6; s5, calculating the heating pipe opening and closing time ratio of the next period according to the difference value of the current temperature and the set temperature, and returning to the step S3; s6, keeping the heating pipe opening and closing time ratio of the previous period, and returning to the step S3. The oven temperature control method can avoid overshoot phenomenon of the temperature in the oven, and recalculate the heating pipe opening and closing time ratio of the next period after the current temperature is stable, thereby avoiding the repeated fluctuation of the temperature in the oven.
Description
Technical Field
The invention relates to the technical field of ovens, in particular to an oven temperature control method and device, an oven and a storage medium.
Background
In recent years, with the improvement of living standard of people, the steaming oven is more and more popular in ordinary residents. The steaming and baking oven facilitates the cooking process, enriches the cooking experience, and meets the pursuit of modern people on high-quality life. The oven generally adopts the NTC temperature sensor to detect the temperature inside the oven, and although the NTC temperature sensor is cheap and easy to install, the NTC temperature sensor has long temperature measurement reaction time and lagged temperature reaction time, so that the real temperature inside the oven is difficult to accurately reflect by the temperature detected by the NTC temperature sensor in real time.
In the prior art, the control method of the temperature inside the oven is to control the heating pipe to work at a corresponding power after the NTC temperature sensor detects the current temperature, so that the temperature inside the oven gradually reaches a set temperature. Because the temperature measurement response time of the NTC temperature sensor lags behind, when the temperature inside the oven reaches the set temperature, but the current temperature detected by the NTC temperature sensor does not reach the set temperature, if the heating pipe is controlled to work with corresponding power immediately according to the detected current temperature, overshoot phenomenon is easily caused when the temperature in the oven exceeds the set temperature, and the heating pipe is controlled to be turned off or the working power of the heating pipe is reduced to reduce the temperature subsequently, so that the temperature in the oven is repeatedly fluctuated, the set temperature is not easily reached quickly, and the electric energy waste is caused.
Disclosure of Invention
The invention provides an oven temperature control method, and aims to solve the problems that in the prior art, the temperature control mode of an oven easily causes the phenomenon of overshoot caused by overhigh temperature in the oven, and the temperature in the oven fluctuates repeatedly.
The invention is realized in such a way that an oven temperature control method is provided, which comprises the following steps:
s1, acquiring the current temperature inside the oven, and calculating the difference between the current temperature and the set temperature;
s2, calculating the on-off time ratio of the heating pipe of the oven in a preset period according to the difference value;
s3, controlling the heating pipe to be turned on and off according to the heating pipe turning-on and turning-off time ratio, and acquiring the current temperature inside the oven in the heating pipe turning-off period;
s4, judging whether the current temperature is stable or not; if yes, go to step S5; if not, go to step S6;
s5, calculating the heating pipe opening and closing time ratio of the next period according to the difference value of the current temperature and the set temperature, and returning to the step S3;
s6, keeping the heating pipe opening and closing time ratio of the previous period, and returning to the step S3.
Preferably, the step of judging whether the current temperature is stable specifically includes:
judging whether the obtained current temperature is consistent with the current temperature obtained last time or not; and if so, determining that the current temperature is kept stable, otherwise, determining that the current temperature is not kept stable.
Preferably, the step of calculating the heating pipe on-off time ratio of the next period according to the difference between the current temperature and the set temperature specifically includes:
calculating a difference between the current temperature and the set temperature;
judging whether the difference value is larger than a preset difference value or not;
if so, directly calculating the on-off time ratio of the heating pipe in the next period according to the difference value;
if not, calculating the heating pipe opening and closing time ratio of the next period according to the difference value and the heating pipe opening and closing time ratio of the previous period.
Preferably, the step of directly calculating the heating pipe on-off time ratio of the next period according to the difference comprises:
by presetting the calculation formula p ═ k1-k0) k, wherein p is the heating tube on-off time ratio of the next period, and k1To a predetermined temperature, k0K is a preset coefficient for the current temperature.
Preferably, the step of calculating the heating tube on-off time ratio of the next cycle according to the difference and the heating tube on-off time ratio of the previous cycle comprises:
by presetting the calculation formula p ═ k1-k0)kt+p0Wherein p is the ratio of the heating tube opening and closing time of the next period, k1To a predetermined temperature, k0Is the current temperature, ktIs a predetermined coefficient, p0The ratio of the heating tube on-off time of the previous cycle.
The present invention also provides an oven temperature control device, comprising:
the first calculation unit is used for acquiring the current temperature inside the oven and calculating the difference value between the current temperature and the set temperature;
the second calculating unit is used for calculating the on-off time ratio of the heating pipe of the oven in a preset period according to the difference value;
the temperature acquisition unit is used for controlling the heating pipe to be switched on and off according to the heating pipe switching-on and switching-off time ratio and acquiring the current temperature inside the oven in the heating pipe switching-off period;
the judging unit is used for judging whether the current temperature is kept stable or not;
the first processing unit is used for calculating the heating pipe opening and closing time ratio of the next period according to the difference value of the current temperature and the set temperature when the current temperature is kept stable;
and the second processing unit is used for keeping the heating pipe opening and closing time ratio of the previous period when the current temperature is not kept stable.
Preferably, the judging unit is specifically configured to:
judging whether the obtained current temperature is consistent with the current temperature obtained last time or not; and if so, determining that the current temperature is kept stable, otherwise, determining that the current temperature is not kept stable.
Preferably, the first processing unit specifically includes:
the difference value calculating module is used for calculating the difference value between the current temperature and the set temperature;
the difference value judging module is used for judging whether the difference value between the current temperature and the set temperature is greater than a preset difference value or not;
the first time ratio calculation module is used for directly calculating the heating pipe opening and closing time ratio of the next period according to the difference value when the difference value is larger than a preset difference value;
and the second time ratio calculation module is used for calculating the time ratio of the heating pipe opening and closing in the next period according to the difference and the time ratio of the heating pipe opening and closing in the previous period when the difference is smaller than or equal to a preset difference.
The present invention also provides an oven comprising:
a heating pipe arranged inside the oven;
a temperature sensor for detecting the temperature inside the oven;
and the processor is respectively connected with the heating pipe and the temperature sensor and is used for realizing the oven temperature control method.
The present invention also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the oven temperature control method described above.
According to the oven temperature control method provided by the invention, the heating pipe opening and closing time ratio of the oven in a preset period is calculated according to the difference value of the current temperature and the set temperature, and the heating pipe opening and closing is controlled according to the heating pipe opening and closing time ratio, so that the intermittent heating of the heating pipe is realized, the current temperature in the oven is obtained in the heating pipe closing period, the temperature measurement reaction time of a temperature sensor is reserved, the detected current temperature is more accurate, and the phenomenon of overshoot caused when the temperature in the oven exceeds the set temperature is avoided; moreover, whether the current temperature is stable or not is judged, and the heating pipe opening and closing time ratio of the next period is recalculated when the current temperature is stable and unchanged, so that the repeated fluctuation of the temperature in the oven caused by the unstable temperature in the oven so as to adjust the heating pipe opening and closing time ratio is avoided, the set temperature can be quickly reached, and the electric energy waste is avoided.
Drawings
Fig. 1 is a flowchart of an oven temperature control method according to an embodiment of the present invention;
fig. 2 is a flowchart of an oven temperature control method according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of an oven temperature control device according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first processing unit of an oven temperature control device according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
According to the oven temperature control method provided by the embodiment of the invention, the heating pipe opening and closing time ratio of the oven in a preset period is calculated according to the difference value between the current temperature and the set temperature, and the heating pipe opening and closing is controlled according to the heating pipe opening and closing time ratio, so that the intermittent heating of the heating pipe is realized, the current temperature in the oven is obtained in the heating pipe closing period, the reaction time of a temperature sensor is reserved, the detected temperature is more accurate, the phenomenon of overshoot caused when the temperature in the oven exceeds the set temperature is avoided, and the temperature control is more accurate; moreover, whether the current temperature is stable or not is judged, and the heating pipe opening and closing time ratio of the next period is recalculated when the previous temperature is stable and unchanged, so that the repeated fluctuation of the temperature in the oven caused by the unstable temperature in the oven so as to adjust the heating pipe opening and closing time ratio is avoided, the set temperature can be quickly reached, and the electric energy waste is avoided.
Example one
Referring to fig. 1, an embodiment of the present invention provides an oven temperature control method, including the following steps:
s1, acquiring the current temperature inside the oven, and calculating the difference between the current temperature and the set temperature;
in the embodiment of the invention, when the oven starts to heat food, the current temperature inside the oven is detected by the NTC temperature sensor arranged inside the oven. The preset temperature can be set according to actual use of a user. The specific calculation mode of the difference between the current temperature and the set temperature is as follows:
the difference between the current temperature and the set temperature is set temperature — current temperature. For example, if the set temperature is 200 ℃, the current temperature is 20 ℃, and the difference between the current temperature and the set temperature is 180 ℃; when the set temperature is 200 ℃ and the current temperature is 150 ℃, the difference between the current temperature and the set temperature is 50 ℃.
S2, calculating the on-off time ratio of the heating pipe of the oven in the preset period according to the difference value;
in the embodiment of the present invention, the preset period may be set according to the actual setting, and the preset period may be one minute or two minutes. In this embodiment, the predetermined period is one minute. The ratio of the on time to the off time of the heating pipe of the oven in the preset period refers to the ratio of the on time to the off time in the preset period of the heating pipe. For example, if the preset period is 1 minute, the heating tube is turned on for 30 seconds within one minute, and the heating tube is turned off for 30 seconds, the ratio of the on time to the off time of the heating tube is 1.
In the embodiment of the invention, the step of calculating the ratio of the heating pipe on time to the heating pipe off time of the oven in the preset period according to the difference value is specifically realized by a preset calculation formula p ═ (k)1-k0) k, wherein p is the heating tube on-off time ratio of the next period, and k1To a predetermined temperature, k0K is a preset coefficient for the current temperature.
In the embodiment of the invention, when the oven starts to heat food, the formula p ═ k is calculated through a preset calculation formula1-k0) k can directly calculate the on-off time ratio p of the heating pipe at the initial moment so as to control the heating pipe to work according to the on-off time ratio p of the heating pipe, thereby realizing the intermittent heating of the heating pipe.
S3, controlling the heating pipe to be turned on and off according to the on-off time ratio of the heating pipe, and acquiring the current temperature inside the oven in the heating pipe turning-off period;
in the embodiment of the invention, after the on-off time ratio of the heating pipe of the oven in the preset period is calculated, the on-off of the heating pipe is controlled according to the calculated on-off time ratio of the heating pipe, so as to realize the intermittent heating of the heating pipe. For example, when the on-off time ratio of the heating pipe is 1, the heating pipe is opened for 30 seconds, and then the heating pipe is controlled to be turned off for 30 seconds, so that the intermittent heating of the heating pipe is realized.
In the embodiment of the invention, because the temperature reaction time of the NTC temperature sensor is lagged, the reaction waiting time of the NTC temperature sensor can be reserved in the heating pipe turn-off period by controlling the intermittent turn-on and turn-off of the heating pipe, so that the current temperature detected by the NTC temperature sensor can more accurately reflect the real temperature in the oven, the phenomenon that the temperature is overhigh and exceeds the set temperature due to the heating of the heating pipe is avoided, and the temperature control is more accurate.
S4, judging whether the current temperature is stable; if yes, go to step S5; if not, go to step S6;
in the embodiment of the invention, whether the current temperature is stable and unchanged is determined by judging whether the current temperature detected for the continuous preset times is consistent, so that the acquired current temperature can truly reflect the temperature in the oven.
As an embodiment of the present invention, the step of determining whether the current temperature is stable specifically includes:
judging whether the acquired current temperature is consistent with the current temperature acquired last time; and if so, determining that the current temperature is kept stable, otherwise, determining that the current temperature is not kept stable.
In this embodiment, whether the current temperature is stable or not is determined by judging whether the current temperatures detected twice continuously are consistent or not, so that the obtained current temperature can truly reflect the temperature inside the oven, and the time for reaching the set temperature is not prolonged significantly.
In this embodiment, whether the current temperature is consistent with the current temperature obtained last time specifically includes: and when the deviation value between the current temperature and the current temperature obtained last time is judged to be in the preset range, the current temperature is considered to be consistent with the current temperature obtained last time. The deviation value may be set according to practice. In this embodiment, the deviation value is set to 0.5 ℃, and if the difference between the current temperature and the last acquired current temperature is within 0.5 ℃, the current temperature is considered to be consistent. For example, when the current temperature is detected to be 150 ℃, and the last acquired current temperature is 149.8 ℃, the current temperature may be considered to be consistent with the last acquired current temperature, that is, the current temperature has been kept stable.
S5, calculating the heating pipe opening and closing time ratio of the next period according to the difference value of the current temperature and the set temperature, and returning to the step S3;
in the embodiment of the invention, when the current temperature is judged to be stable, the current temperature is considered to be stable and not to change any more, at the moment, the on-off time ratio of the heating pipe in the next period is calculated according to the difference value between the current temperature and the set temperature, the on-off time ratio of the heating pipe is recalculated according to the stable current temperature, so that the heating pipe is heated in the next period according to the recalculated on-off time ratio, and the circulation is continuously carried out so as to ensure that the temperature in the oven reaches the set temperature and is finally maintained at the set temperature. Because the on-off time ratio of the heating pipe is recalculated only after the current temperature is judged to be stable, the repeated fluctuation of the temperature in the oven caused by the unstable adjustment of the corresponding on-off time ratio of the temperature in the oven is avoided, the oven temperature control method can avoid the repeated fluctuation of the temperature in the oven, so that the time for reaching the set temperature is short, and the electric energy waste is avoided.
S6, keeping the heating pipe opening and closing time ratio of the previous period, and returning to the step S3.
In the embodiment of the invention, when the current temperature is judged not to be kept stable, the heating pipe opening and closing time ratio of the previous period is kept, namely the heating pipe opening and closing time ratio is not required to be recalculated, and the heating pipe opening and closing time ratio of the previous period is used as the heating pipe opening and closing time ratio of the next period. The heating pipe is controlled to be opened and closed by keeping the heating pipe opening and closing time ratio of the previous period, and the heating pipe opening and closing time ratio of the next period is calculated until the current temperature is judged to be stable, so that the repeated fluctuation of the temperature in the oven caused by the unstable temperature in the oven so as to adjust the corresponding opening and closing time ratio is avoided.
According to the oven temperature control method provided by the embodiment of the invention, the heating pipe opening and closing time ratio of the oven in a preset period is calculated according to the difference value between the current temperature and the set temperature, the heating pipe opening and closing is controlled according to the heating pipe opening and closing time ratio, the current temperature in the oven is obtained in the heating pipe closing period, the heating pipe is controlled to work according to the calculated opening and closing time ratio, the intermittent heating of the heating pipe is realized, the reaction time of a temperature sensor is reserved, the detected current temperature is more accurate, the temperature is prevented from being too high to exceed the set temperature, and the temperature control is more accurate; moreover, whether the current temperature is stable or not is judged, and the heating pipe opening and closing time ratio of the next period is recalculated when the current temperature is stable and unchanged, so that the repeated fluctuation of the temperature in the oven caused by the unstable temperature in the oven so as to adjust the heating pipe opening and closing time ratio is avoided, the time for reaching the set temperature is short, and the electric energy waste is avoided.
Example two
Referring to fig. 2, based on the first embodiment, in step S5, the step of calculating the heating tube on-off time ratio of the next cycle according to the difference between the current temperature and the set temperature specifically includes:
s51, calculating the difference between the current temperature and the set temperature;
in this embodiment, when the heating pipe operates according to the corresponding on-off time ratio, in each operating cycle of the heating pipe, the current temperature in the oven is obtained by the NTC temperature sensor in the heating pipe off period, so as to calculate the difference between the current temperature and the set temperature. Wherein, the difference between the current temperature and the set temperature is the set temperature-the current temperature.
S52, judging whether the difference is larger than a preset difference or not;
in this embodiment, the preset difference value may be set according to actual needs. In this embodiment, the preset difference is 25 ℃, and when the difference between the current temperature and the set temperature is greater than 25 ℃, the difference is considered to be greater than the preset difference; and when the difference value is less than or equal to 25 ℃, the difference value between the current temperature and the set temperature is not considered to be greater than the preset difference value.
S53, if yes, directly calculating the heating pipe opening and closing time ratio of the next period according to the difference;
in this embodiment, when the difference is determined to be greater than the preset difference, the heating pipe on-off time ratio in the next period is directly calculated according to the difference, and the calculation method is simple.
Specifically, the step of directly calculating the heating pipe on-off time ratio of the next period according to the difference comprises the following steps:
by presetting the calculation formula p ═ k1-k0) k, wherein p is the heating tube on-off time ratio of the next period, and k1To a predetermined temperature, k0K is a preset coefficient for the current temperature. The formula is simple in calculation mode, and the formula can be used for obtaining a larger opening-closing time ratio of the heating pipe, so that the temperature in the oven can quickly reach the vicinity of the set temperature after the heating pipe works.
And S54, if not, calculating the heating pipe opening and closing time ratio of the next period according to the difference and the heating pipe opening and closing time ratio of the previous period.
Specifically, the step of calculating the heating pipe on-off time ratio of the next period according to the difference and the heating pipe on-off time ratio of the previous period comprises the following steps:
by presetting the calculation formula p ═ k1-k0)kt+p0Wherein p is the ratio of the heating tube opening and closing time of the next period, k1To a predetermined temperature, k0Is the current temperature, ktIs a predetermined coefficient, p0The ratio of the heating tube on-off time of the previous cycle.
In the embodiment, the heating pipe opening and closing time ratio of the next period is calculated according to the difference value and the heating pipe opening and closing time ratio of the previous period, so that the heating pipe opening and closing time ratio of the next period can be continuously calculated according to the accumulated difference value and the heating pipe opening and closing time ratio of the previous period, absolute errors are eliminated, and temperature control can be accurately realized when the temperature in the oven is close to the set temperature.
EXAMPLE III
Referring to fig. 3, an embodiment of the present invention provides an oven temperature control apparatus, which includes a first calculating unit 10, a second calculating unit 20, a temperature obtaining unit 30, a determining unit 40, a first processing unit 50, and a second processing unit 60.
The first calculating unit 10 is configured to obtain a current temperature inside the oven, and calculate a difference between the current temperature and a set temperature.
In the embodiment of the invention, when the oven starts to heat food, the current temperature inside the oven is detected by the NTC temperature sensor arranged inside the oven. The preset temperature can be set according to actual use of a user. The specific calculation mode of the difference between the current temperature and the set temperature is as follows:
the difference between the current temperature and the set temperature is set temperature — current temperature. For example, if the set temperature is 200 ℃, the current temperature is 20 ℃, and the difference between the current temperature and the set temperature is 180 ℃; when the set temperature is 200 ℃ and the current temperature is 150 ℃, the difference value between the current temperature and the set temperature is 50 ℃;
the second calculating unit 20 is configured to calculate a heating pipe on-off time ratio of the oven in a preset period according to the difference.
In the embodiment of the present invention, the preset period may be set according to the actual setting, and the preset period may be one minute or two minutes. In this embodiment, the predetermined period is one minute. The ratio of the on time to the off time of the heating pipe of the oven in the preset period refers to the ratio of the on time to the off time in the preset period of the heating pipe. For example, if the preset period is 1 minute, the heating tube is turned on for 30 seconds within one minute, and the heating tube is turned off for 30 seconds, the ratio of the on time to the off time of the heating tube is 1.
In the embodiment of the invention, the step of calculating the ratio of the heating pipe on time to the heating pipe off time of the oven in the preset period according to the difference value is specifically realized by a preset calculation formula p ═ (k)1-k0) k, wherein p is the heating tube on-off time ratio of the next period, and k1To a predetermined temperature, k0K is a preset coefficient for the current temperature.
In the embodiment of the invention, when the oven starts to heat food, the formula p ═ k is calculated through a preset calculation formula1-k0) k can directly calculate the heating tube opening at the initial momentThe turn-off time ratio p is used for controlling the heating pipe to work according to the turn-on and turn-off time ratio p of the heating pipe so as to realize the intermittent heating of the heating pipe.
The temperature obtaining unit 30 is configured to control the heating tube to be turned on and off according to the heating tube on-off time ratio, and obtain the current temperature inside the oven during the heating tube off period.
In the embodiment of the invention, after the on-off time ratio of the heating pipe of the oven in the preset period is calculated, the on-off of the heating pipe is controlled according to the calculated on-off time ratio of the heating pipe, so as to realize the intermittent heating of the heating pipe. For example, when the on-off time ratio of the heating pipe is 1, the heating pipe is opened for 30 seconds, and then the heating pipe is controlled to be turned off for 30 seconds, so that the intermittent heating of the heating pipe is realized.
In the embodiment of the invention, because the temperature reaction time of the NTC temperature sensor is lagged, the reaction waiting time of the NTC temperature sensor can be reserved in the heating pipe turn-off period by controlling the intermittent turn-on and turn-off of the heating pipe, so that the current temperature detected by the NTC temperature sensor can be more accurate, the overshoot phenomenon caused by the fact that the current temperature is too high and exceeds the set temperature is avoided, and the temperature control is more accurate.
In the embodiment of the present invention, the determining unit 40 is configured to determine whether the current temperature is stable. Whether the current temperature detected by the continuous preset times is consistent or not is judged, so that whether the current temperature is stable or not is determined, and the obtained current temperature can truly reflect the temperature inside the oven.
As an embodiment of the present invention, the determining unit 40 is specifically configured to:
judging whether the acquired current temperature is consistent with the current temperature acquired last time; and if so, determining that the current temperature is kept stable, otherwise, determining that the current temperature is not kept stable.
In this embodiment, the determining unit 40 determines whether the current temperature is stable by determining whether the current temperatures detected twice consecutively are consistent, so that the obtained current temperature can truly reflect the temperature inside the oven, and the time for reaching the set temperature is not significantly prolonged.
In this embodiment, the specific steps of determining whether the current temperature is consistent with the current temperature obtained last time by the determining unit 40 are: and when the deviation value between the current temperature and the current temperature obtained last time is judged to be in the preset range, the current temperature is considered to be consistent with the current temperature obtained last time. The deviation value may be set according to practice. In this embodiment, the deviation value is set to 0.5 ℃, and if the difference between the current temperature and the last acquired current temperature is within 0.5 ℃, the current temperature is considered to be consistent. For example, when the current temperature is detected to be 150 ℃, and the last acquired current temperature is 149.8 ℃, the current temperature may be considered to be consistent with the last acquired current temperature, that is, the current temperature has been kept stable.
The first processing unit 50 is configured to calculate a heating tube on-off time ratio of a next period according to a difference between the current temperature and the set temperature when the current temperature is kept stable.
In the embodiment of the present invention, when the determining unit 40 determines that the current temperature is stable, the current temperature is considered to be stable and not to change, at this time, the first processing unit 50 calculates the on-off time ratio of the heating tube in the next period, to recalculate the on-off time ratio of the heating tube according to the stable current temperature, to control the heating tube to heat in the next period according to the recalculated on-off time ratio, and to do so continuously in a cycle to make the temperature in the oven reach the set temperature and finally maintain the set temperature. Because the on-off time ratio of the heating pipe is recalculated only after the current temperature is judged to be stable, the repeated fluctuation of the temperature in the oven caused by the unstable adjustment of the corresponding on-off time ratio of the temperature in the oven is avoided, the oven temperature control method can avoid the repeated fluctuation of the temperature in the oven, so that the time for reaching the set temperature is short, and the electric energy waste is avoided.
The second processing unit 60 is configured to maintain the on-off time ratio of the heater in the previous cycle when the current temperature is not kept stable.
In the embodiment of the present invention, when the determining unit 40 determines that the current temperature is not kept stable, the second processing unit 60 keeps the heating tube on-off time ratio of the previous period, that is, the heating tube on-off time ratio does not need to be recalculated, and the second processing unit 60 uses the heating tube on-off time ratio of the previous period as the heating tube on-off time ratio of the next period. Heating pipe opening and closing heating is carried out by keeping the heating pipe opening and closing time ratio of the previous period, and the heating pipe opening and closing time ratio of the next period is calculated until the current temperature is judged to be stable, so that the repeated fluctuation of the temperature in the oven caused by the fact that the temperature in the oven is not stable and the corresponding opening and closing time ratio is adjusted is avoided.
Example four
Referring to fig. 4, in the third embodiment, the first processing unit 50 specifically includes a difference calculating module 501, a difference determining module 502, a first time ratio calculating module 503, and a second time ratio calculating module 504.
The difference calculating module 501 is used for calculating the difference between the current temperature and the set temperature.
In this embodiment, when the heating pipe operates according to the corresponding on-off time ratio, in each operating cycle of the heating pipe, in the heating pipe off period, the current temperature in the oven is obtained by the NTC temperature sensor, so as to calculate the difference between the current temperature and the set temperature. Wherein, the difference between the current temperature and the set temperature is the set temperature-the current temperature.
The difference determining module 502 is configured to determine whether the difference is greater than a preset difference.
In this embodiment, the preset difference value may be set according to actual needs. In this embodiment, the preset difference is 25 ℃, and when the difference between the current temperature and the set temperature is greater than 25 ℃, the difference is considered to be greater than the preset difference; and when the difference value is less than or equal to 25 ℃, the difference value between the current temperature and the set temperature is not considered to be greater than the preset difference value.
The first time ratio calculating module 503 is configured to calculate a heating pipe on-off time ratio of the next period according to the difference when the difference is greater than the preset difference.
In this embodiment, when the difference is greater than the preset difference, the first time ratio calculating module 503 directly calculates the heating pipe on-off time ratio of the next period according to the difference.
Specifically, the step of directly calculating the heating pipe on-off time ratio in the next period by the first time ratio calculation module 503 according to the difference includes:
by presetting the calculation formula p ═ k1-k0) k, wherein p is the heating tube on-off time ratio of the next period, and k1To a predetermined temperature, k0K is a preset coefficient for the current temperature.
The second time ratio calculating module 504 is configured to calculate a heating pipe on-off time ratio of a next period according to the difference and the heating pipe on-off time ratio of a previous period when it is determined that the difference is not greater than the preset difference.
Specifically, the step of calculating the heating pipe on-off time ratio of the next period by the second time ratio calculating module 504 according to the difference and the heating pipe on-off time ratio of the previous period includes:
by presetting the calculation formula p ═ k1-k0)kt+p0Wherein p is the ratio of the heating tube opening and closing time of the next period, k1To a predetermined temperature, k0Is the current temperature, ktIs a predetermined coefficient, p0The ratio of the heating tube on-off time of the previous cycle.
In this embodiment, the heating tube on-off time ratio of the next period is calculated according to the difference and the heating tube on-off time ratio of the previous period, so that the heating tube on-off time ratio of the next period can be calculated according to the accumulated difference and the heating tube on-off time ratio of the previous period, thereby eliminating an absolute error and more accurately realizing temperature control when the temperature in the oven is close to the set temperature.
EXAMPLE five
An embodiment of the present invention further provides an oven, including:
a heating pipe arranged inside the oven;
a temperature sensor for detecting the temperature inside the oven;
and the processor is respectively connected with the heating pipe and the temperature sensor and is used for realizing the oven temperature control method of the embodiment.
In the embodiment of the invention, the temperature sensor is an NTC temperature sensor. The heating pipe of the oven is controlled to be switched on and off according to the heating pipe switching-on and switching-off time ratio, the current temperature in the oven is obtained in the heating pipe switching-off period, the heating pipe is controlled to work according to the calculated switching-on and switching-off time ratio, intermittent heating of the heating pipe is achieved, the reaction time of a temperature sensor is reserved, the detected current temperature is more accurate, the phenomenon that the temperature exceeds the set temperature and overshoots is avoided, and the temperature control is more accurate; moreover, whether the current temperature is stable or not is judged, and the heating pipe opening and closing time ratio of the next period is recalculated when the current temperature is stable and unchanged, so that the repeated fluctuation of the temperature in the oven caused by the unstable temperature in the oven so as to adjust the heating pipe opening and closing time ratio is avoided, the time for the oven to reach the set temperature is short, and the electric energy waste is avoided.
EXAMPLE six
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the oven temperature control method of the above-described embodiments. The computer program may be stored in a computer readable storage medium. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable storage medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of oven temperature control, the method comprising the steps of:
s1, acquiring the current temperature inside the oven, and calculating the difference between the current temperature and the set temperature;
s2, calculating the on-off time ratio of the heating pipe of the oven in a preset period according to the difference value;
s3, controlling the heating pipe to be turned on and off according to the heating pipe turning-on and turning-off time ratio, and acquiring the current temperature inside the oven in the heating pipe turning-off period;
s4, judging whether the current temperature is stable or not; if yes, go to step S5; if not, go to step S6;
s5, calculating the heating pipe opening and closing time ratio of the next period according to the difference value of the current temperature and the set temperature, and returning to the step S3;
s6, keeping the heating pipe opening and closing time ratio of the previous period, and returning to the step S3.
2. The oven temperature control method according to claim 1, wherein the step of determining whether the current temperature is stable specifically comprises:
judging whether the obtained current temperature is consistent with the current temperature obtained last time or not; and if so, determining that the current temperature is kept stable, otherwise, determining that the current temperature is not kept stable.
3. The oven temperature control method according to claim 1, wherein the step of calculating the heating pipe on-off time ratio of the next period according to the difference between the current temperature and the set temperature specifically comprises:
calculating a difference between the current temperature and the set temperature;
judging whether the difference value is larger than a preset difference value or not;
if so, directly calculating the on-off time ratio of the heating pipe in the next period according to the difference value;
if not, calculating the heating pipe opening and closing time ratio of the next period according to the difference value and the heating pipe opening and closing time ratio of the previous period.
4. The oven temperature control method of claim 3, wherein the step of directly calculating a heating tube on-off time ratio for the next cycle based on the difference comprises:
by presetting the calculation formula p ═ k1-k0) k, wherein p is the heating tube on-off time ratio of the next period, and k1To a predetermined temperature, k0K is a preset coefficient for the current temperature.
5. The oven temperature control method of claim 3, wherein the step of calculating a heat pipe on and off time ratio for a next cycle based on the difference and a heat pipe on and off time ratio for a previous cycle comprises:
by presetting the calculation formula p ═ k1-k0)kt+p0Wherein p is the ratio of the heating tube opening and closing time of the next period, k1To a predetermined temperature, k0Is the current temperature, ktIs a predetermined coefficient, p0The ratio of the heating tube on-off time of the previous cycle.
6. An oven temperature control apparatus, comprising:
the first calculation unit is used for acquiring the current temperature inside the oven and calculating the difference value between the current temperature and the set temperature;
the second calculating unit is used for calculating the on-off time ratio of the heating pipe of the oven in a preset period according to the difference value;
the temperature acquisition unit is used for controlling the heating pipe to be switched on and off according to the heating pipe switching-on and switching-off time ratio and acquiring the current temperature inside the oven in the heating pipe switching-off period;
the judging unit is used for judging whether the current temperature is kept stable or not;
the first processing unit is used for calculating the heating pipe opening and closing time ratio of the next period according to the difference value of the current temperature and the set temperature when the current temperature is kept stable;
and the second processing unit is used for keeping the heating pipe opening and closing time ratio of the previous period when the current temperature is not kept stable.
7. The oven temperature control device of claim 6, wherein the determining unit is specifically configured to:
judging whether the obtained current temperature is consistent with the current temperature obtained last time or not; and if so, determining that the current temperature is kept stable, otherwise, determining that the current temperature is not kept stable.
8. The oven temperature control device of claim 6, wherein the first processing unit comprises:
the difference value calculating module is used for calculating the difference value between the current temperature and the set temperature;
the difference value judging module is used for judging whether the difference value between the current temperature and the set temperature is greater than a preset difference value or not;
the first time ratio calculation module is used for directly calculating the heating pipe opening and closing time ratio of the next period according to the difference value when the difference value is larger than a preset difference value;
and the second time ratio calculation module is used for calculating the time ratio of the heating pipe opening and closing in the next period according to the difference and the time ratio of the heating pipe opening and closing in the previous period when the difference is smaller than or equal to a preset difference.
9. An oven, characterized in that the oven comprises:
a heating pipe arranged inside the oven;
a temperature sensor for detecting the temperature inside the oven;
a processor, which is respectively connected with the heating pipe and the temperature sensor, and is used for implementing the oven temperature control method of any one of claims 1 to 5.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the oven temperature control method according to any one of claims 1 to 5.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114766920A (en) * | 2022-03-29 | 2022-07-22 | 宁波方太厨具有限公司 | Oven no-load detection method and oven adopting detection method |
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Application publication date: 20210511 |