JP5236525B2 - Temperature control device - Google Patents

Description

  The present invention relates to a temperature adjustment device that heats or cools a target temperature by using a temperature regulator such as a heater or a heat exchanger of a refrigeration apparatus such as an oven, a refrigerator, or a freezer.

  In Patent Document 1, a heating element (temperature regulator) and a temperature sensor (temperature sensor) are provided in a cooking cabinet (container), and the temperature sensor is set so that the temperature in the cooking cabinet becomes a set temperature. An oven cooker is disclosed in which the cooking chamber is set to a set temperature by controlling the energization time of the heating element based on the detection result. This oven cooker shortens the on-time of the heating element when the average temperature in the cooking chamber tends to rise so that the temperature in the cooking chamber becomes the set temperature, and the average temperature in the cooking chamber becomes When there is a downward trend, the heating element is controlled so that the ON time of the heating element becomes longer.

JP-A-2-199787

  In the temperature adjusting device such as the oven cooker described in Patent Document 1 as described above, when the temperature in the container is set as the target temperature, the heater is stopped at the upper limit temperature with respect to the target temperature, and the heater is set at the lower limit temperature. However, even if heating of the heater is stopped, the heating is continued due to the remaining heat of the heater and the temperature in the cooking chamber rises. However, the temperature in the cooking chamber does not rise because the temperature cannot be sufficiently heated, and the temperature control in the cooking chamber is delayed. As a result, the actual temperature in the container became higher than the upper limit temperature and lower than the lower limit temperature, and the overshoot temperature and undershoot temperature were increased. In particular, when the output of the heater of the oven cooker is large, there is a problem that the temperature of the overshoot is further increased and hunting is excessively performed. The present invention aims to solve such problems.

  In order to solve the above-described problems, the present invention provides a temperature regulator that heats or cools the interior of the storage, a temperature sensor that detects the temperature in the storage, and a temperature so that the temperature in the storage reaches a predetermined target temperature. In a temperature adjustment device comprising a control device that controls the operation of the temperature regulator between the upper limit temperature and the lower limit temperature of the target temperature based on the detected temperature of the sensor, the control device is the difference between the detected temperature and the target temperature. A temperature deviation calculating means for calculating a temperature deviation, a temperature deviation gradient calculating means for calculating a temperature deviation gradient from the temperature deviation timely calculated by the temperature deviation calculating means, and a difference between the detected temperature and the upper limit temperature or the lower limit temperature The upper limit temperature deviation calculating means and the lower limit temperature deviation calculating means for calculating the upper limit temperature deviation or the lower limit temperature deviation, and the temperature deviation gradient calculated by the temperature deviation gradient calculating means A prediction time calculation means for calculating an upper limit temperature prediction time or a lower limit temperature prediction time to be a temperature or a lower limit temperature, an upper limit temperature deviation calculated from an upper limit temperature deviation calculation means, or a lower limit temperature deviation calculated from a lower limit temperature deviation calculation means; Determination means for determining a change state of temperature at which the temperature in the container approaches or departs from the upper limit temperature or the lower limit temperature while the temperature in the container rises or falls from the upper limit temperature prediction time or the lower limit temperature prediction time calculated by the prediction time calculation means And the control device controls the operation of the temperature regulator based on the determination result by the determination means and the upper limit temperature prediction time or the lower limit temperature prediction time calculated by the prediction time calculation means. A temperature control device is provided.

  In the temperature control apparatus configured as described above, the upper limit temperature or lower limit temperature is increased or decreased by the judging means from the upper limit temperature deviation or lower limit temperature deviation and the upper limit temperature predicted time or lower limit temperature predicted time. Since the temperature change state approaching or leaving the temperature is determined, and the operation of the temperature regulator is controlled based on this determination result and the upper limit temperature prediction time or the lower limit temperature prediction time, the operation of the temperature regulator is controlled. In consideration of the time to be heated or cooled by the residual heat (including cold heat) generated after the stop, after the temperature regulator is stopped before the upper limit temperature or the lower limit temperature is reached, the temperature regulator is started. Considering the time required for heating or cooling, the temperature regulator can be started before the lower limit temperature or upper limit temperature is reached in advance. Settling device can be realized range highly accurate temperature control in the upper limit temperature and the lower limit temperature to the target temperature.

  In the temperature control apparatus configured as described above, the temperature controller heats the inside of the storage, and the control device determines that the temperature in the storage is rising by the determination means while approaching the upper limit temperature. If it is determined that the upper limit temperature prediction time is shorter than the predetermined time heated by the residual heat after the operation of the temperature regulator is stopped, the temperature inside the container is set to the upper limit by controlling the operation of the temperature regulator in advance. The operation of the temperature regulator can be stopped without exceeding the temperature, and the temperature regulator can realize highly accurate temperature control.

  In the temperature adjustment device configured as described above, the temperature regulator heats the inside of the storage, and the control device determines that the temperature in the storage is approaching the lower limit temperature while the temperature in the storage is lowered by the determination means. If it is determined that the lower limit temperature prediction time is shorter than the predetermined time required for heating after starting the operation of the temperature regulator, the temperature in the container is lower than the lower limit temperature when the temperature regulator is controlled to operate in advance. The operation of the temperature regulator can be started without exceeding, and the temperature regulator can realize highly accurate temperature control.

  In the temperature adjusting device configured as described above, the temperature regulator cools the inside of the storage, and the control device determines that the temperature in the storage is approaching the upper limit temperature while the temperature in the storage is rising by the determination means. If it is determined that the upper limit temperature prediction time is shorter than a predetermined time required for cooling after starting the operation of the temperature regulator, the temperature in the container is set to the upper limit temperature when the temperature regulator is controlled to operate in advance. The operation of the temperature regulator can be started without exceeding, and the temperature adjustment device can realize highly accurate temperature control.

  In the temperature adjustment device configured as described above, the temperature regulator cools the inside of the storage, and the control device determines that the temperature in the storage is approaching the lower limit temperature while the temperature in the storage is lowered by the determination means. If the lower limit temperature prediction time is determined to be shorter than the predetermined time for cooling by the aftercooling heat after stopping the operation of the temperature regulator, the operation of the temperature regulator is stopped without the temperature in the container exceeding the lower limit temperature. Therefore, the temperature adjusting device can realize highly accurate temperature control.

  In the temperature control apparatus configured as described above, if the upper limit temperature or the lower limit temperature is corrected based on the temperature deviation calculated by the temperature deviation calculation means, the temperature regulator is heated after starting or stopping. Alternatively, even if the predetermined time to be cooled changes due to external factors such as air temperature, the temperature adjustment device performs high-precision temperature control using the upper and lower temperature limits corrected by the temperature deviation calculated during temperature control. Can be realized.

It is the schematic of the steam convection oven which is one Embodiment of the temperature control apparatus which concerns on this invention. It is a block diagram of a control apparatus. (A) It is a figure which shows upper limit temperature 1st-4th change condition (b) It is a figure which shows lower limit temperature 1st-4th change condition It is a flowchart which shows the program for the temperature adjustment by a control apparatus (1). It is a flowchart which shows the program for the temperature adjustment by a control apparatus (2). It is a flowchart which shows the program for the temperature adjustment by a control apparatus (3). It is a flowchart which shows the program for the temperature adjustment by a control apparatus (4). It is a flowchart which shows the program for the temperature adjustment by a control apparatus (5).

  Below, embodiment of steam convection oven 10 which is one embodiment of the temperature control device concerning the present invention is described with reference to drawings. The steam convection oven 10 according to the present invention includes a heater (temperature regulator) 13 for heating the inside of the cooking cabinet (container) 12, a temperature sensor 14 for detecting the temperature in the cooking cabinet 12, and the temperature in the cooking cabinet 12. Is provided with a control device 20 that controls the operation of the heater 13 between the upper limit temperature and the lower limit temperature of the target temperature based on the temperature detected by the temperature sensor 14 so that the temperature becomes a predetermined target temperature. A temperature deviation calculating means for calculating a temperature deviation which is a difference between the detected temperature by 14 and a target temperature, a temperature deviation gradient calculating means for calculating a temperature deviation gradient from the temperature deviation timely calculated by the temperature deviation calculating means, An upper limit temperature prediction time or a lower limit temperature prediction time at which the temperature in the cooking cabinet 12 becomes the upper limit temperature or the lower limit temperature is calculated from the temperature deviation gradient calculated by the temperature deviation gradient calculating means. Predicted time calculation means, upper limit temperature deviation calculation means and lower limit temperature deviation calculation means for calculating an upper limit temperature deviation or a lower limit temperature deviation that is a difference between the temperature detected by the temperature sensor 14 and the upper limit temperature or the lower limit temperature, and upper limit temperature deviation calculation The temperature in the cooking chamber 12 is calculated from the lower limit temperature deviation calculated from the upper limit temperature deviation or lower limit temperature deviation calculation means calculated from the means and the upper limit temperature predicted time or lower limit temperature predicted time calculated by the prediction time calculation means. A determination unit that determines that the upper limit temperature or the lower limit temperature is approached or departed while increasing or decreasing, and the control device 20 determines the determination result by the determination unit and the upper limit temperature predicted time or lower limit calculated by the predicted time calculation unit. The operation of the heater 13 is controlled based on the estimated temperature time. Below, this steam convection oven 10 is explained in full detail.

  The steam convection oven 10 includes a cooking chamber 12 (container) for cooking food in a housing 11, a heater (temperature regulator) 13 provided in the cooking chamber 12 for heating the cooking chamber 12, and a cooking chamber. 12, a temperature sensor 14 that detects the temperature in the cooking chamber 12, a blower fan 15 that is provided in the cooking chamber 12 to convect the air in the cooking chamber 12, and the outside of the cooking chamber 12. A steam generator 17 is provided in the machine room 16 to supply steam into the cooking chamber 12.

  A controller 20 that controls the temperature in the cooking cabinet 12 is connected to the heater 13 and the temperature sensor 14. The control device 20 includes a microcomputer, and controls the operation of the heater 13 based on detection by the temperature sensor 14 by executing a program corresponding to the flowcharts shown in FIGS. A target temperature generator 21 is connected to the control device 20, and the target temperature generator 21 outputs a target temperature corresponding to a cooking program selected by operating an operation switch (not shown) to the control device 20. Is.

The control device 20 includes a temperature deviation calculating means for calculating a temperature deviation that is a difference between the temperature detected by the temperature sensor 14 and the target temperature output from the target temperature generator 21, and the temperature detected by the temperature sensor 14 and the upper limit temperature. Upper limit temperature deviation calculating means for calculating an upper limit temperature deviation which is a difference, and lower limit temperature deviation calculating means for calculating a lower limit temperature deviation which is a difference between the temperature detected by the temperature sensor 14 and the lower limit temperature. The upper limit temperature is a temperature obtained by adding the upper limit correction temperature to the target temperature, and the lower limit temperature is a temperature obtained by adding the lower limit correction temperature to the target temperature. The temperature deviation, upper limit temperature deviation, and lower limit temperature deviation are calculated by the following equations.
Temperature deviation (K) = detected temperature-target temperature upper limit temperature deviation (K) = temperature deviation-upper limit correction temperature lower limit temperature deviation (K) = temperature deviation-lower limit correction temperature If the upper limit temperature deviation is a positive value If the temperature detected by the temperature sensor 14 is higher than the upper limit temperature and the upper limit temperature deviation is a negative value, the temperature detected by the temperature sensor 14 is lower than the upper limit temperature. The same applies to the lower limit temperature deviation.

The control device 20 includes a temperature deviation gradient calculating unit that calculates a temperature deviation gradient from the temperature deviation calculated by the temperature deviation calculating unit, and a temperature deviation gradient calculated by the temperature deviation gradient calculating unit. And an estimated time calculating means for calculating an upper limit temperature predicted time or a lower limit temperature estimated time at which the temperature becomes the upper limit temperature or the lower limit temperature. These temperature deviation gradient, upper limit temperature prediction time, and lower limit temperature prediction time are calculated by the following equations.
Temperature deviation gradient (K / min) = 60 seconds / 10 seconds × (latest temperature deviation−temperature deviation 10 seconds before)
Upper limit temperature prediction time (seconds) = 60 × (−upper limit temperature deviation) / temperature deviation gradient lower limit temperature prediction time (seconds) = 60 × (−lower limit temperature deviation) / temperature deviation gradient Here, upper limit temperature prediction time is positive If it is a value, it means that the upper limit temperature is reached after x seconds, and if it is a negative value, it means that the upper limit temperature was reached before x seconds, and the same applies to the lower limit temperature prediction time.

  Further, the control device 20 determines the upper limit temperature deviation calculated from the upper limit temperature deviation calculation means or the lower limit temperature deviation calculated from the lower limit temperature deviation calculation means, and the upper limit temperature prediction time or lower limit temperature prediction calculated by the prediction time calculation means. Determination means for determining a change state of the temperature approaching or leaving the upper limit temperature or the lower limit temperature while the temperature in the cooking chamber 12 increases or decreases from the time.

  The determination means of the control device 20 will be described in detail. First, as shown in FIG. 3A, in the relationship between the upper limit temperature deviation and the upper limit temperature prediction time, the upper limit temperature prediction time is a positive value and the upper limit temperature deviation is positive. The first change state of the upper limit temperature that takes the value of is a change state that approaches the upper limit temperature while the temperature in the cooking chamber 12 is decreasing, the upper limit temperature prediction time is a negative value, and the upper limit temperature deviation is a positive value. The upper limit temperature second change state indicates a change state in which the temperature in the cooking chamber 12 rises and leaves the upper limit temperature, and the upper limit temperature third time at which the upper limit temperature prediction time takes a negative value and the upper limit temperature deviation takes a negative value. The change situation indicates a change situation in which the temperature in the cooking chamber 12 decreases while the temperature falls, and the upper limit temperature fourth change situation in which the upper limit temperature prediction time takes a positive value and the upper limit temperature deviation takes a negative value is: Change that approaches the upper limit temperature while the temperature in the cooking chamber 12 rises It shows the situation.

  Next, as shown in FIG. 3B, in the relationship between the lower limit temperature deviation and the lower limit temperature prediction time, the lower limit temperature first change state in which the lower limit temperature prediction time has a positive value and the lower limit temperature deviation has a positive value. Indicates a change situation in which the temperature in the cooking cabinet 12 decreases and approaches the lower limit temperature, and the lower limit temperature second change situation in which the lower limit temperature prediction time takes a negative value and the lower limit temperature deviation takes a positive value is The lower limit temperature third change state in which the lower limit temperature prediction time takes a negative value and the lower limit temperature deviation takes a negative value is shown in FIG. The lower limit temperature fourth change state in which the lower limit temperature prediction time takes a positive value and the lower limit temperature deviation takes a negative value is shown while the temperature in the cooking chamber 12 is rising. It shows the changing situation approaching the lower limit temperature.

  The control device 20 determines the first to fourth change states of the upper limit temperature or the lower limit temperature, which are the determination results determined by the determination unit, and the upper limit temperature predicted time or the lower limit temperature predicted time calculated by the predicted time calculation unit. Control means for controlling the operation of the heater 13 is provided. More specifically, as shown in Table 1, the control device 20 determines that the upper limit temperature is the first change state, and the lower limit temperature predicted time calculated by the predicted time calculation means is longer than 40 seconds as the predetermined time. If it is judged, since the inside of the cooking chamber 12 is higher than the upper limit temperature and the temperature does not decrease for a while, the heating of the heater 13 is controlled to stop. If it determines with it being the upper limit temperature 2nd change condition, the control apparatus 20 will judge that the inside of the cooking chamber 12 is clearly higher than an upper limit temperature, and will control to stop the heating of the heater 13. FIG. When determining that the upper limit temperature is the third change state, the control device 20 determines that the inside of the cooking cabinet 12 is lower than the upper limit temperature, and does not control the operation of the heater 13. The control device 20 determines that the upper limit temperature is in the fourth change state, and if the upper limit temperature predicted time calculated by the predicted time calculation means is shorter than 20 seconds as the predetermined time heated by the residual heat after the operation of the heater 13 is stopped. If it judges, since the inside of the cooking chamber 12 will be heated up and will become upper limit soon, it controls so that the heating by the heater 13 is stopped.

  In addition, the control device 20 determines that the lower limit temperature is the first change state, and the temperature in the cooking chamber 12 rises after the lower limit temperature predicted time calculated by the predicted time calculation means starts the operation of the heater 13. If it is determined that the time required is shorter than 20 seconds, the cooking chamber 12 is controlled to be heated by the heater 13 because the temperature in the cooking chamber 12 is decreasing and soon becomes the lower limit temperature. When determining that the lower limit temperature is the second change state, the control device 20 determines that the inside of the cooking cabinet 12 is higher than the lower limit temperature, and does not control the operation of the heater 13. If it determines with it being the minimum temperature 3rd change condition, the control apparatus 20 will determine that the inside of the cooking chamber 12 is clearly lower than a minimum temperature, and will control so that it may heat with the heater 13. FIG. When the control device 20 determines that the upper limit temperature is the fourth change state and determines that the upper limit temperature predicted time predicted by the predicted time calculation means is longer than 40 seconds as the predetermined time, the inside of the cooking chamber 12 is lower than the lower limit temperature. It is determined that the temperature will not rise for a while, and the heater 13 is controlled to heat.

  Further, the control device 20 monitors the temperature deviation calculated by the temperature deviation calculating means described above, and calculates an overshoot temperature that is a temperature deviation higher than the target temperature and an undershoot temperature that is a temperature deviation lower than the target temperature. The calculating means is provided. The controller 20 constantly monitors this temperature deviation, updates the highest temperature deviation value as the overshoot provisional temperature, and updates the lowest temperature deviation value as the undershoot provisional temperature. The temporary overshoot temperature and the temporary undershoot temperature are determined before the heating by the heater 13 is started and before the heating is stopped. The control device 20 corrects the upper limit correction temperature and the lower limit correction temperature based on the overshoot temperature and the undershoot temperature obtained from the temperature deviation calculated by the temperature deviation calculation means, and these corrected upper limit correction temperature and lower limit correction temperature. A calculating means for calculating an upper limit temperature and a lower limit temperature using the temperature;

  The control device 20 has a built-in memory 22, and the memory 22 stores control information for determining the upper limit temperature and the lower limit temperature first to fourth changes used in the determination means. Further, the memory 22 stores the temperature deviation, the temperature deviation gradient, the upper limit temperature deviation, the lower limit temperature deviation, the upper limit temperature prediction time, the lower limit temperature prediction time, the overshoot provisional temperature, and the undershoot provisional time calculated by each of the above means. The temperature, the upper limit correction temperature, and the lower limit correction temperature are temporarily stored.

  Next, a temperature control program in the cooking chamber 12 by the control device 20 of the steam convection oven 10 will be described. As shown in FIG. 4, the control device 20 repeatedly executes a program that mainly calculates and records a temperature deviation in step 100. In step 101, the target temperature is input from the target temperature generator 21 to the control device 20, and the detected temperature in the cooking chamber 12 is input from the temperature sensor 14 to the control device 20 in step 102. In step 103, the control device 20 calculates a temperature deviation which is the difference between the temperature detected by the temperature sensor 14 and the target temperature by the temperature deviation calculation means. In step 104, the control device 20 measures the calculated temperature deviation. Is stored in the memory 22. The control device 20 sets the temperature higher than the target temperature among the temperature deviations as the overshoot temporary temperature, sets the temperature lower than the target temperature as the undershoot temporary temperature, and stores the overshoot temporary temperature and the undershoot temporary temperature in the memory. 22 is stored.

  As shown in FIG. 5, the control device 20 mainly calculates an upper limit temperature deviation, a lower limit temperature deviation, a temperature deviation gradient, an upper limit temperature prediction time, and a lower limit temperature prediction time in Step 200, The program for judging each change state is repeatedly executed. In step 201, the control device 20 initializes each set value. Specifically, the control device 20 includes a temperature deviation gradient = 0, an upper limit temperature prediction time = 300 seconds, a lower limit temperature prediction time = 300 seconds, and a buffer among each buffer area having an index from 0 to 39 for storing the temperature deviation. Region [0] ([] indicates an index) = the latest temperature deviation. In step 202, the control device 20 waits until 1 second has elapsed by the timer 23.

  In step 203, the control device 20 resets the timer 23, acquires the latest temperature deviation recorded in step 104, and sets the upper limit temperature deviation by the upper limit temperature deviation calculation means and the lower limit temperature deviation by the lower limit temperature deviation calculation means. Is calculated. In step 204, the control device 20 calculates the temperature deviation gradient by the temperature deviation gradient calculation means based on the latest temperature deviation data.

  In step 205, the control device 20 determines whether the temperature deviation gradient calculated in step 204 is not 0, and determines “YES” if the temperature deviation gradient is not 0. In step 206, the control device 20 predicts The upper limit temperature prediction time and the lower limit temperature prediction time are calculated by the time calculation means, and each change state of the upper limit temperature and the lower limit temperature is determined, and the calculated upper limit temperature prediction time and the lower limit temperature prediction time are determined. Each change state of the temperature and the lower limit temperature is stored in the memory 22, and the process proceeds to Step 207. On the other hand, since the predicted time cannot be calculated when the temperature deviation gradient calculated in step 204 is 0, the control device 20 proceeds to step 207 without proceeding to step 206 in step 205.

  In step 207, the control device 20 adds the value “1” to the index and proceeds to step 208. In step 208, the control device 20 determines whether or not the index is smaller than the value “40”. If the index is smaller than the value “40”, the control device 20 repeatedly executes the program starting from step 202. On the other hand, if the index exceeds 40, the index is set to the value “0” and the program starting from step 202 is repeatedly executed.

  As shown in FIGS. 6-8, the control apparatus 20 mainly performs the temperature control in the cooking chamber 12 in step 300. FIG. In step 301, the control device 20 initializes each set value for temperature adjustment. Specifically, the control device 20 sets the upper limit correction temperature = 0, the lower limit correction temperature = 0, and the number of masks = 2, and proceeds to step 302. In step 302, the control device 20 sets overshoot temperature = 0K, undershoot temperature = −0.5K, overshoot target time = 20 seconds, and undershoot target time = 20 seconds. Note that the 20-second time set as the overshoot target time or the undershoot target time is equal to a predetermined time during which the cooking chamber 12 is heated by the residual heat after the heater 13 stops heating, and after the heating by the heater 13 is started. It corresponds to the predetermined time required for the cooking chamber 12 to be heated, and these times can be set to any predetermined time depending on the capability of the heater 13. Next, in step 303, the control device 20 acquires the overshoot provisional temperature recorded in step 105, sets a grace counter = 0, and proceeds to step 304.

  The program of steps 304 to 313 to be described is a program for determining whether to stop heating by the heater 13 and start heating by the heater 13 again. In step 304, the control device 20 stops heating by the heater 13, the temperature deviation gradient calculated in step 204, the calculated upper limit temperature predicted time and lower limit temperature predicted time, and the determined upper limit temperature and lower limit temperature. Each change state is updated to the latest, and the value of the grace counter is set to “0”. In step 305, the control device 20 determines whether or not the updated change state of the lower limit temperature is the lower limit temperature first change situation, and if it is the lower limit temperature first change situation, it determines “YES” and step 306. Proceed to In step 306, the control device 20 determines whether or not the lower limit temperature prediction time is shorter than the undershoot prediction time of 20 seconds, and determines “NO” if the lower limit temperature prediction time is not shorter than 20 seconds. Proceed to 310, and if the lower limit temperature prediction time is shorter than 20 seconds, determine “YES” and proceed to step 311. In step 310, the control device 20 sets the grace counter to the value “0” and then returns the program to step 304. On the other hand, in step 311, the control device 20 adds the value “1” to the postponement counter and proceeds to step 312. In step 312, the control device 20 determines whether or not the value of the grace counter is “2” or more. If the grace counter is smaller than the value “2”, the control device 20 sets the program to step 304. return.

  On the other hand, when the change state of the lower limit temperature updated in step 304 is not the first change state, in step 305, the control device 20 determines “NO” and proceeds to step 307. In step 307, the control device 20 determines whether or not the change state of the lower limit temperature updated in step 304 is the lower limit temperature third change situation. Since the temperature is low, it is determined as “YES”, and the processing of steps 311 and 312 is executed in the same manner as described above. On the other hand, when the change state of the lower limit temperature updated in step 304 is not the third change state, in step 307, the control device 20 determines “NO” and proceeds to step 308. In step 308, the control device 20 determines whether or not the change state of the lower limit temperature updated in step 304 is the lower limit temperature fourth change situation, and if it is the lower limit temperature fourth change situation, determines “YES”. Then, the process proceeds to step 309. If the change state of the lower limit temperature is not the fourth change state of the lower limit temperature, it is determined as “NO” and the process proceeds to step 310 to set the grace counter to 0 in the same manner as described above, and then the program is executed. Return to 304. In step 309, the control device 20 determines whether or not the upper limit temperature prediction time is longer than 40 seconds, which is twice the overshoot prediction time of 20 seconds. The process of steps 311 and 312 is executed in the same manner as described above by determining “YES”. On the other hand, when the upper limit temperature predicted time updated in step 304 is shorter than 40 seconds, in step 309, the control device 20 determines “NO”, proceeds to step 310, and sets the grace counter to 0 as described above. Return the program to step 304.

  If the value of the grace counter becomes “2” or more while repeatedly executing the processing from step 304 to step 312 described above, the control device 20 determines “YES” in step 312 and proceeds to step 313. In step 313, the control device 20 determines the overshoot provisional temperature as the overshoot temperature, and acquires the undershoot provisional temperature recorded in step 105.

  Next, in step 314, the control device 20 determines whether or not the operation time of the heater 13 is 5 seconds or more and the stop time is 5 seconds or more in order to determine whether or not the control of the heater 13 is stable. If the operation time of the heater 13 is 5 seconds or more and the stop time is 5 seconds or more, it is determined that the heater 13 is not operating stably, and the process starts from step 317 without calculating the upper limit correction temperature and the lower limit correction temperature. Run the program.

  Steps 317 to 326 described below are programs for determining whether to start heating by the heater 13 and stop heating by the heater 13 again. In step 317, the control device 20 starts heating by the heater 13, the temperature deviation gradient calculated in step 204, the calculated upper limit temperature predicted time and lower limit temperature predicted time, and the determined upper limit temperature and lower limit temperature. Each change state is updated to the latest one, and the value of the grace count is set to “0”. In step 318, the control device 20 determines whether or not the updated change state of the upper limit temperature is the upper limit temperature second change state. And proceeds to step 324. In step 324, the control device 20 adds the value “1” to the postponement counter and proceeds to step 325. In step 325, the control device 20 determines whether or not the value of the grace counter is “2” or more. If the value of the grace counter is smaller than “2”, the control device 20 sets the program to step 317. return.

  On the other hand, when the change state of the upper limit temperature updated in step 317 is not the second change state, in step 318, the control device 20 determines “NO” and proceeds to step 319. In step 319, the control device 20 determines whether or not the change state of the upper limit temperature updated in step 317 is the upper limit temperature first change state, and if it is the upper limit temperature first change state, determines “YES”. Then, the process proceeds to step 320, and if the upper limit temperature first change state is not “NO”, the process proceeds to step 321. In step 320, the control device 20 determines whether or not the lower limit temperature prediction time is longer than 40 seconds, which is twice the overshoot prediction time of 20 seconds. If the lower limit temperature prediction time is longer than 40 seconds, “YES” is determined. ”And the processing of steps 324 and 325 described above is executed. On the other hand, if the lower limit temperature prediction time is shorter than 40 seconds, the control device 20 determines “NO” in step 320, proceeds to step 323, sets the grace counter to “0”, and returns the program to step 317. .

  On the other hand, if the determination is “NO” in step 319 instead of the first upper limit temperature change state, in step 321, the control device 20 indicates that the upper limit temperature change state updated in step 317 is the upper limit temperature fourth change state. If it is determined that there is an upper limit temperature fourth change condition, the determination is “YES” and the process proceeds to step 322. If it is not the upper limit temperature fourth change condition, the determination is “NO” and the process proceeds to step 323. As described above, the grace counter is set to “0” and the program is returned to step 317. In step 322, the control device 20 determines whether or not the upper limit temperature prediction time is shorter than the overshoot target time of 20 seconds, and determines “YES” if the upper limit temperature prediction time is shorter than 20 seconds. The processes of steps 324 and 325 described above are executed. On the other hand, if the upper limit temperature predicted time updated in step 318 is longer than 20 seconds, in step 322, the control device 20 determines “NO”, proceeds to step 323, and performs the same as described above. After setting the value to “0”, the program is returned to step 304.

  If the value of the grace counter becomes “2” or more while repeatedly executing the processing of steps 317 to 325 described above, the control device 20 determines “YES” in step 325 and proceeds to step 326. In 326, the control device 20 determines the undershoot provisional temperature as the undershoot temperature, and acquires the overshoot provisional temperature. When the process of step 326 ends, the control device 20 executes the program starting from step 304 again.

  The control device 20 determines whether to stop heating by the heater 13 in steps 304 to 313 and start heating by the heater 13 again, and starts heating by the heater 13 in steps 317 to 326 again. The program for correcting the upper limit correction temperature and the lower limit correction temperature for calculating the upper limit temperature and the lower limit temperature is executed while the program for determining whether to stop the heating by the heater 13 is executed. To do. More specifically, after a program for determining whether to stop heating by the heater 13 and start heating by the heater 13 again in steps 304 to 313 is executed, in step 314, the control device 20 In order to determine whether the heater 13 is operating stably, it is determined whether the operation time of the heater 13 is 5 seconds or more and the stop time is 5 seconds or more, and the operation time of the heater 13 is 5 If it is longer than 2 seconds and the stop time is not longer than 5 seconds, it is determined that the operation is stable, and the process proceeds to Step 315. In step 315, the control device 20 determines whether or not the number of masks is 0 or less in order to suppress correction immediately after the start of heating, and determines “NO” if the number of masks is not 0 or less. Then, the process proceeds to 316 and “1” is subtracted from the mask count, and the process proceeds to Step 317. When the number of masks becomes 0 or less while repeatedly executing the program starting from step 317 and the program starting from step 304, the control device 20 determines “YES” in step 315 and the upper limit correction starting from step 327 Run the temperature and lower correction temperature correction program.

In this correction program, first, in step 327, the control device 20 determines whether or not the overshoot temperature is higher than 2K. If the overshoot temperature is higher than 2K, it determines “YES”, and in step 328, the upper limit correction is performed. The temperature is corrected and the process proceeds to Step 331. The upper limit correction temperature corrected here is calculated by the following equation.
Upper limit correction temperature = Current upper limit correction temperature + (0.1+ (0.4−overshoot temperature) / 4)
In the above equation, “0.1” is for guaranteeing a precision loss in fixed-point arithmetic, “0.4” is defined as the dead band width, and “/ 4” is the overshoot temperature. This is to reduce the influence of

On the other hand, if the overshoot temperature is not higher than 2K, the control device 20 determines “NO” in step 327 and proceeds to step 329. In step 329, the control device 20 determines whether or not the overshoot temperature is lower than 0.4K, and determines “YES” if the overshoot temperature is lower than 0.4K. In step 330, the upper limit correction temperature is determined. The process proceeds to step 331. The upper limit correction temperature corrected here is calculated by the following equation.
Upper limit correction temperature = Current upper limit correction temperature− (0.1+ (overshoot temperature−2K) / 4)
In the above equation, “0.1” is for guaranteeing precision loss in fixed-point arithmetic, “2” is defined as the dead band width, and “/ 4” is the effect of overshoot temperature. Is to reduce the size.

  If the overshoot temperature is not higher than 2K and lower than 0.4K, it is determined as “NO” in step 327 and step 329, respectively, and the process proceeds to step 331 without correcting the upper limit correction temperature.

In step 331, it is determined whether or not the undershoot temperature is lower than −2K. If the overshoot temperature is lower than −2K, “YES” is determined. In step 332, the lower limit correction temperature is corrected and step 335 is corrected. Proceed to The lower limit correction temperature corrected here is calculated by the following equation.
Lower limit correction temperature = current lower limit correction temperature + (0.1 + (− undershoot temperature−2K) / 4)
In the above equation, “0.1” is for guaranteeing precision loss in fixed-point arithmetic, “2” is defined as the dead band width, and “/ 4” is the effect of undershoot temperature. Is to reduce the size.

On the other hand, if the undershoot temperature is lower than −2 K, the control device 20 determines “NO” in step 331, and proceeds to step 333. In step 333, control device 20 determines whether or not the undershoot temperature is higher than −0.4K. If the undershoot temperature is higher than −0.4K, it determines “YES”. In step 334, lower limit is set. The correction temperature is corrected and the process proceeds to step 335. The lower limit correction temperature corrected here is calculated by the following equation.
Lower limit correction temperature = current lower limit correction temperature− (0.1+ (0.4K + undershoot temperature) / 4)
In the above formula, “0.1” is for guaranteeing a precision loss in fixed-point arithmetic, “0.4” is defined as a dead band width, and “/ 4” is an undershoot temperature. This is to reduce the influence of

  If the undershoot temperature is not lower than −2K but higher than −0.4K, it is determined as “NO” in step 331 and step 333, respectively, and the process proceeds to step 335 without newly calculating the lower limit correction temperature. The processes in steps 335 to 338 are for dealing with the case where the upper limit correction temperature becomes lower than the lower limit correction temperature because the temperature in the cooking chamber 12 changes abruptly. In step 335, the control device 20 determines whether or not the upper limit correction temperature is lower than the lower limit correction temperature. If the upper limit correction temperature is not lower than the lower limit correction temperature, the control device 20 determines “YES” and proceeds to step 338. If the upper limit correction temperature is lower than the lower limit correction temperature, “NO” is determined, and the process proceeds to step 336. In step 336, the control device 20 proceeds to step 337 as a value obtained by dividing the upper limit correction temperature by adding the upper limit correction temperature and the lower limit correction temperature by 2, and in step 337, the lower limit correction temperature is calculated in step 336. The process proceeds to step 338 with the same value as the correction temperature. In step 338, in order to prevent the upper limit correction temperature and the lower limit correction temperature from becoming excessively high or low, the upper limit correction temperature and the lower limit correction temperature are limited to values between −5K and 5K, respectively. To step 317.

  As described above, the control device 20 of the steam convection oven 10 according to the present invention increases or decreases the temperature in the cooking chamber 12 from the upper limit temperature deviation or the lower limit temperature deviation and the upper limit temperature predicted time or the lower limit temperature predicted time. Since the change state of the temperature that approaches or leaves the upper limit temperature or the lower limit temperature while descending is determined, and the operation of the heater 13 is controlled based on the determination result and the upper limit temperature predicted time or the lower limit temperature predicted time, Considering the time to be heated by the residual heat generated after stopping the operation of the heater 13, the operation of the heater 13 is stopped before reaching the upper limit temperature in advance, or the heater 13 is heated after starting the operation. Since the operation of the heater 13 can be started before the lower limit temperature is reached in consideration of the time required, steam convection is performed. Oven 10 can be realized range highly accurate temperature control in the upper limit temperature and the lower limit temperature to the target temperature.

  Further, the control device 20 of the steam convection oven 10 corrects the upper limit temperature or the lower limit temperature based on the overshoot value and the undershoot value obtained from the temperature deviation calculated by the temperature deviation calculating means. Even if the predetermined time heated or cooled after the operation of the heater 13 is started or stopped changes due to an external factor such as air temperature, the steam convection oven 10 has the upper limit temperature corrected by the temperature deviation calculated in the temperature control. Highly accurate temperature control can be realized using the lower limit temperature.

  In addition, although said embodiment demonstrated the steam convection oven as a temperature control apparatus, this invention is not limited to this, Like the steam convection oven 10, the inside of the cooking chamber (container) 11 is heated by the heater 13. Instead of heating, the storage room (container) such as a refrigerator or a freezer may be cooled by a heat exchanger (temperature controller) of the refrigeration apparatus.

  In that case, the control device such as the refrigerator or the freezer has the first to fourth change states of the upper limit temperature or the lower limit temperature as the determination result determined by the determination unit, and the upper limit temperature calculated by the predicted time calculation unit. Control means for controlling the operation of the heat exchanger of the refrigeration system based on the predicted time or the lower limit temperature predicted time is as follows. As shown in Table 2, the control device determines that the first change state of the upper limit temperature and determines that the lower limit temperature predicted time calculated by the predicted time calculation means is longer than 40 seconds as the predetermined time, for example. Since the temperature is higher than the upper limit temperature and the temperature does not decrease for a while, control is performed so as to start cooling by the heat exchanger. If it determines with it being the upper limit temperature 2nd change condition, a control apparatus will judge that the storage chamber is clearly higher than an upper limit temperature, and will control to start cooling by a heat exchanger. When determining that the upper limit temperature is the third change state, the control device determines that the storage chamber is lower than the upper limit temperature and does not control the operation of the heat exchanger. When the control device determines that the upper limit temperature is the fourth change state and determines that the upper limit temperature predicted time calculated by the predicted time calculation means is shorter than, for example, 20 seconds, the upper limit of the storage chamber is rising soon. Since the temperature is reached, control is performed to start cooling by the heat exchanger.

  Further, when the control device determines that the lower limit temperature first change state is present, and determines that the lower limit temperature predicted time calculated by the predicted time calculation means is shorter than, for example, 20 seconds, the temperature in the storage chamber is decreasing soon. Since the lower limit temperature is reached, the cooling by the heat exchanger is controlled to stop. If it determines with it being the minimum temperature 2nd change condition, a control apparatus will judge that the inside of a store | warehouse | chamber is higher than a minimum temperature, and will not control the action | operation of a heat exchanger. If it determines with it being the minimum temperature 3rd change condition, the control apparatus 20 will judge that the inside of a cooking chamber is clearly lower than a minimum temperature, and will control it to stop the cooling by a heat exchanger. When the control device determines that the upper limit temperature is the fourth change state and determines that the upper limit temperature predicted time predicted by the predicted time calculation means is longer than, for example, 40 seconds, the inside of the storage is lower than the lower limit temperature, Is determined not to rise, and control is performed to stop cooling by the heat exchanger. Since the temperature control device such as a refrigerator or a freezer controlled in this way can obtain the same effects as described above, detailed description thereof is omitted.

  DESCRIPTION OF SYMBOLS 10 ... Temperature control apparatus (steam convection oven), 11 ... Storage container, 12 ... Temperature controller (heater), 13 ... Temperature sensor, 20 ... Control apparatus.

Claims (6)

A temperature regulator for heating or cooling the interior of the container;
A temperature sensor for detecting the temperature in the storage;
A temperature control device comprising: a control device for controlling the operation of the temperature regulator between an upper limit temperature and a lower limit temperature based on a temperature detected by the temperature sensor so that the temperature in the container becomes a predetermined target temperature. In the device
The control device calculates a temperature deviation which is a difference between the detected temperature and the target temperature;
A temperature deviation gradient calculating means for calculating a temperature deviation gradient from the temperature deviation timely calculated by the temperature deviation calculating means;
An upper limit temperature deviation calculating means and a lower limit temperature deviation calculating means for calculating an upper limit temperature deviation or a lower limit temperature deviation which is a difference between the detected temperature and the upper limit temperature or the lower limit temperature;
A predicted time calculating means for calculating an upper limit temperature predicted time or a lower limit temperature predicted time at which the temperature in the container becomes the upper limit temperature or the lower limit temperature from the temperature deviation gradient calculated by the temperature deviation gradient calculating means;
From the upper limit temperature deviation calculated from the upper limit temperature deviation calculation means or the lower limit temperature deviation calculated from the lower limit temperature deviation calculation means, and the upper limit temperature prediction time or lower limit temperature prediction time calculated by the prediction time calculation means, Determination means for determining a change state of a temperature that approaches or leaves the upper limit temperature or the lower limit temperature while the temperature in the container rises or falls,
The control device controls the operation of the temperature regulator based on a determination result by the determination unit and an upper limit temperature prediction time or a lower limit temperature prediction time calculated by the prediction time calculation unit. Temperature control device. The temperature regulator according to claim 1, wherein the temperature regulator heats the inside of the storage.
The control device determines that the temperature inside the storage container is approaching the upper limit temperature while the temperature in the container is rising by the determination means, and the upper limit temperature prediction time is heated by residual heat after the operation of the temperature regulator is stopped. When it is determined that the time is shorter than the predetermined time, the temperature regulator is controlled to stop the operation of the temperature regulator in advance. The temperature regulator according to claim 1 or 2, wherein the temperature regulator heats the inside of the storage.
The control device determines that the temperature in the container is approaching the lower limit temperature while the temperature in the container is lowered by the determination means, and the lower limit temperature prediction time is required for heating after starting the operation of the temperature regulator. If it is determined that the time is shorter than the predetermined time, the temperature regulator is controlled to operate in advance. The temperature regulator according to claim 1, wherein the temperature regulator cools the inside of the storage.
The control device determines that the temperature in the container is approaching the upper limit temperature while the temperature in the container is rising by the determination means, and the upper limit temperature prediction time is required for cooling after starting the operation of the temperature regulator. If it is determined that the time is shorter than the predetermined time, the temperature regulator is controlled to operate in advance. The temperature regulator according to claim 1 or 4, wherein the temperature regulator cools the inside of the container.
The control device determines that the temperature in the container is approaching the lower limit temperature while the temperature in the container is lowered by the determination means, and the lower limit temperature prediction time is cooled by residual cooling heat after the operation of the temperature regulator is stopped. If the temperature is determined to be shorter than the predetermined time, the temperature regulator is controlled to stop the operation of the temperature regulator in advance. In the temperature control apparatus of any one of Claims 1-5,
The temperature adjusting device characterized in that the upper limit temperature or the lower limit temperature is corrected based on the temperature deviation calculated by the temperature deviation calculating means.

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