JP5265390B2 - Flyer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fryer which makes oil temperature more stabilized around a target value. <P>SOLUTION: In a fryer which heats oil with a heater, a surface temperature feedback control is performed so that a surface temperature Kh may become a surface temperature target value Kh* when an oil temperature Kq is under a change reference oil temperature Ks (time t0-t3), an oil temperature feedback control is performed so that the oil temperature Kq may become an oil temperature target value Kq* when the oil temperature Kq is a change reference oil temperature Ks or more (time t3-). Thereby, the oil temperature Kq is raised for a short time since heating starts and it can be stabilized around the oil temperature target value Kq*. Moreover, it judges whether cooked objects were put into the oil and the oil temperature Kq fell during the oil temperature feedback control, then, while affirmative judgement is being made (time t4-t5), the heater makes 100% output and downshoot in the oil temperature Kq is controlled. Furthermore, if it judges that the state the cooked objects are put into the oil and the oil temperature Kq fell is recovered, the oil temperature feedback control is resumed (time t5-), and the overshoot of the oil temperature is controlled. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a flyer.

  In a fryer that cooks cooking oil by heating it with a heater arranged inside the oil tank, heating by the heater is adjusted so that the temperature of the oil becomes constant at a target value. For example, Patent Document 1 describes an oil fryer that performs cooking oil temperature management based on a heater temperature detected by a heater temperature sensor.

JP 2003-259992 A

  Here, the temperature of the oil may deviate from the target value due to a time difference until the heat from the heater is transferred to the oil, and it is difficult to keep the oil temperature constant at the target value. However, it is desired to stabilize the temperature of the oil in the vicinity of the target value in order to cook the food at an appropriate temperature and to suppress the oxidation of the oil.

  The present invention has been made in view of the above-described problems, and has as its main object to stabilize the oil temperature near the oil temperature target value.

  The present invention adopts the following means in order to achieve the main object described above.

The first flyer of the present invention is
An oil tank for storing oil;
Heating means for heating the oil in the oil tank;
A predetermined value that can be regarded as a food being put in the oil tank during the execution of oil temperature feedback control for feedback control of the output of the heating means so that the oil temperature in the oil tank becomes a predetermined target oil temperature value. It is determined whether or not the food input condition is satisfied. If the food input condition is satisfied, the oil temperature feedback control is executed during the period until the predetermined return condition is satisfied. Control means for performing high output control for controlling the output of the heating means to be high output, and restarting the oil temperature feedback control after the return condition is satisfied;
It is equipped with.

  In the first fryer of the present invention, when food is fed into the oil tank during the execution of oil temperature feedback control for feedback control of the output of the heating means so that the oil temperature in the oil tank becomes a predetermined target oil temperature value. It is determined whether or not a predetermined food input condition that can be considered is satisfied, and if the food input condition is satisfied, oil temperature feedback control is executed until the predetermined return condition is satisfied. High output control is performed to control the output of the heating means to be higher than in the case of performing, and the oil temperature feedback control is resumed after the return condition is satisfied. By doing this, the output of the heating means can be increased during the period when the oil temperature decreases due to the input of the cooked food, and the downshoot of the oil temperature can be suppressed, and the return time from the oil temperature lowered state when the food is charged Can be shortened. Therefore, the oil temperature can be further stabilized near the oil temperature target value. In addition, since the recovery time from the low oil temperature state when the food is charged is shortened, the degree of freedom of the time when the food is charged increases, and the variation in the cooking time due to the time when the food is charged is reduced, resulting in a finished food. Easy to manage time.

  In the first fryer of the present invention, the cooking input condition may be a condition that an oil temperature decrease rate representing a decrease amount per unit time of the oil temperature exceeds a predetermined input detection decrease rate. In this way, it is possible to detect the input of the cooked food more appropriately. In this case, the input detection decrease rate is set such that the larger the initial oil temperature increase rate that represents the amount of increase in the oil temperature per unit time in the initial heating period that is the initial period for heating the oil, the greater the increase. An input detection descent rate setting means may be provided. In this way, it is possible to more appropriately detect the input of the cooked food in consideration of conditions such as the amount of oil, oil type, and outside temperature.

  In the first fryer of the present invention, the cooking input condition may be a condition that the oil temperature is lower than an input detection oil temperature set to a value lower than the oil temperature target value. In this way, it is possible to detect the input of the cooked food more appropriately. In this case, the input detection oil temperature is set so as to decrease as the initial oil temperature increase rate indicating the amount of increase in the oil temperature per unit time in the initial heating period, which is an initial period for heating the oil, becomes smaller. An input detection oil temperature setting means may be provided. In this way, it is possible to more appropriately detect the input of the cooked food in consideration of conditions such as the amount of oil, oil type, and outside temperature.

  In the first flyer of the present invention, the return condition may be a condition that the oil temperature exceeds a return oil temperature set to a value lower by a predetermined allowable amount than the oil temperature target value. In this way, the oil temperature feedback control can be resumed more appropriately, and the oil temperature overshoot can be suppressed. Therefore, the oil temperature is stabilized near the target value sooner after the food is added, and the power consumption of the heating means can be reduced.

  In the first flyer of the present invention, the high output control may be a control such that the output of the heating means becomes a predetermined high output. Even if it does in this way, while the temperature of oil falls by input of a cooking thing, while being able to suppress the downshoot of oil temperature by making the output of a heating means high output, it returns from the oil temperature fall state at the time of cooking input You can save time.

  In the first fryer of the present invention, the high output control is performed so that the surface temperature of the heating unit becomes the target surface temperature for cooking set to a value higher than the target oil temperature. The output may be feedback controlled. Even if it does in this way, while the temperature of oil falls by input of a cooking thing, while being able to suppress the downshoot of oil temperature by making the output of a heating means high output, it returns from the oil temperature fall state at the time of cooking input You can save time.

  In the first fryer of the present invention, the control means sets the surface temperature of the heating means to a value higher than the oil temperature target value in an initial heating period, which is an initial period for heating the oil. A surface temperature feedback control is performed to feedback-control the output of the heating means so as to be an initial heating surface temperature target value, and the oil temperature is lower than the oil temperature target value during the execution of the surface temperature feedback control. It is determined whether or not the switching reference oil temperature is set below, and if a positive determination is made, it is considered that the initial heating period is in progress, the surface temperature feedback control is continued, and a negative determination is made. If the operation is performed, the oil temperature feedback control may be executed by assuming that the initial heating period has ended. In this way, during the initial heating period, the oil temperature is brought close to the target oil temperature in a short time by the surface temperature feedback control, and after the oil temperature approaches the target oil temperature, the oil temperature is overshot by the oil temperature feedback control. The oil temperature can be controlled to be the oil temperature target value while being suppressed. Therefore, the oil temperature can be raised in a shorter time from the start of heating and stabilized near the oil temperature target value. Moreover, the power consumption of a heating means can be reduced by suppressing the overshoot of oil temperature. In this case, there is provided a switching reference oil temperature setting means for setting the switching reference oil temperature so that the larger the initial oil temperature increase rate indicating the amount of increase in the oil temperature per unit time in the initial heating period, the smaller the tendency. It is good. In this way, oil temperature overshoot can be further suppressed in consideration of conditions such as the amount of oil, oil type, and outside temperature.

The second flyer of the present invention is
An oil tank for storing oil;
Heating means for heating the oil in the oil tank;
In the initial heating period, which is an initial period for heating the oil, the output of the heating means is set so that the surface temperature of the heating means becomes a surface temperature target value set higher than a predetermined oil temperature target value. Whether or not the oil temperature in the oil tank is lower than the switching reference oil temperature set to a value lower than the target oil temperature value during the execution of the surface temperature feedback control. If a positive determination is made, the surface temperature feedback control is continued assuming that the initial heating period is in progress, and if a negative determination is made, the initial heating period ends. Control means for performing oil temperature feedback control for feedback control of the output of the heating means so that the oil temperature becomes the oil temperature target value
It is equipped with.

  In the second flyer of the present invention, the surface temperature target in which the surface temperature of the heating means is set to a value higher than the predetermined oil temperature target value in the initial heating period, which is the initial period of heating the oil in the oil tank. The surface temperature feedback control that feedback-controls the output of the heating means so as to become a value is executed, and the oil temperature falls below the switching reference oil temperature set to a value lower than the oil temperature target value during the execution of the surface temperature feedback control If a positive determination is made, it is considered that the initial heating period is in progress, and the surface temperature feedback control is continued. If a negative determination is made, the initial heating period ends. Therefore, oil temperature feedback control is executed to feedback control the output of the heating means so that the oil temperature becomes the oil temperature target value. In this way, during the initial heating period, the oil temperature is brought close to the target oil temperature in a short time by the surface temperature feedback control, and after the oil temperature approaches the target oil temperature, the oil temperature overshoot is performed by the oil temperature feedback control. It is possible to control the oil temperature to be the oil temperature target value while suppressing the oil pressure. Therefore, the oil temperature can be raised in a shorter time from the start of heating and stabilized near the oil temperature target value. Moreover, the power consumption of a heating means can be reduced by suppressing the overshoot of oil temperature. In this case, there is provided a switching reference oil temperature setting means for setting the switching reference oil temperature so that the larger the initial oil temperature increase rate indicating the amount of increase in the oil temperature per unit time in the initial heating period, the smaller the tendency. It is good. In this way, oil temperature overshoot can be further suppressed in consideration of conditions such as the amount of oil, oil type, and outside temperature.

The block diagram which shows the outline of a structure of the flyer 10 which is this embodiment. The flowchart which shows an example of a heater control routine. The relationship diagram of oil temperature target value Kq *, initial oil temperature rise rate Rs, and switching reference oil temperature Ks. 7 is a flowchart illustrating an example of an insertion determination routine. FIG. 5 is a relationship diagram between an initial oil temperature increase rate Rs and an input detection decrease rate Rr. FIG. 5 is a relationship diagram between an oil temperature target value Kq *, an initial oil temperature increase rate Rs, and an input detection oil temperature Kd. Explanatory drawing which shows a mode that oil temperature Kq is stabilized in oil temperature target value Kq * vicinity. The flowchart which shows an example of an abnormality determination routine.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing an outline of the configuration of a flyer 10 according to an embodiment of the present invention.

  As shown in FIG. 1, the fryer 10 of the present embodiment includes an oil tank 30 that contains cooking oil 20, a heater 40 that heats the oil 20, a heater unit 41 that generates heat by flowing current through the heater 40, and An oil temperature sensor 51 that detects the oil temperature Kq of the oil 20, a surface temperature sensor 52 that is attached to the surface of the heater 40 and detects the surface temperature Kh of the heater 40, displays various information, and inputs user instructions. A control panel 70 that controls the output of the heater 40.

  The oil tank 30 is a stainless steel container capable of accommodating a maximum of 23 L of oil 20, and the cooked product can be fried with the oil 20 by feeding the cooked product through the upper opening.

  The heater 40 is configured as a sheathed heater in which a heating wire wound in a coil shape is inserted into the center of a metal pipe, and a gap between the metal pipe and the heating coil is filled with an insulator to integrate the current. The oil 20 in the oil tank 30 can be heated by the heat generated by.

  The heater unit 41 generates heat by flowing a current corresponding to the control amount input from the control unit 70 to the heater 40.

  The operation panel 60 includes a display unit 61 that displays various information such as the oil temperature Kq and the presence or absence of abnormality of the fryer 10, and an operation unit 62 that inputs instructions from the user such as the oil temperature target value Kq *. . In addition, the fryer 10 of this embodiment can designate oil temperature target value Kq * in the range of 150 degreeC-200 degreeC.

  The controller 70 is a device that outputs to the heater unit 41 a control amount for stabilizing the oil temperature Kq near the oil temperature target value Kq *. The control unit 70 includes an oil temperature feedback circuit 72, a surface temperature feedback circuit 73, and a control circuit 71. The oil temperature feedback circuit 72 derives the oil temperature control amount Pq by PID control so that the difference between the oil temperature Kq input from the oil temperature sensor 51 and the oil temperature target value Kq * input from the operation panel 60 becomes zero. To the control circuit 71. The surface temperature feedback circuit 73 derives and controls the surface temperature control amount Ph by PID control so that the difference between the surface temperature Kh input from the surface temperature sensor 52 and the preset surface temperature target value Kh * becomes zero. Output to the circuit 71. The control circuit 71 includes an oil temperature Kq detected by the oil temperature sensor 51, a surface temperature Kh detected by the surface temperature sensor 52, an oil temperature control amount Pq from the oil temperature feedback circuit 73, and a surface temperature control from the surface temperature feedback circuit 74. Various signals such as the amount Ph and an operation signal from the operation panel 60 are input, various information is output to the operation panel 60, and a control amount is output to the heater unit 41. Note that other feedback control such as PI control may be employed instead of PID control. Further, the surface temperature target value Kh * is set as a value higher than the oil temperature target value Kq *.

  The operation of the flyer 10 of the present embodiment thus configured, in particular, the heater control process for controlling the heater 40 to stabilize the oil temperature Kq near the oil temperature target value Kq *, and the presence or absence of abnormality of the flyer 10 are determined. The abnormality determination process to be performed will be described.

  First, the heater control process will be described. FIG. 2 is a flowchart showing an example of the heater control routine. This routine is stored in an internal memory (storage means) (not shown) of the control circuit 71. When the user operates the operation unit 62 of the operation panel 60 to instruct the oil 20 to reach the oil temperature target value Kq *, the routine is predetermined. It is repeatedly executed every time (in this embodiment, every second).

  When this heater control routine is executed, the control circuit 71 first starts the oil temperature Kq from the oil temperature sensor 51, the oil temperature target value Kq * from the operation unit 62, and the oil temperature control amount from the oil temperature feedback circuit 72. Pq and the surface temperature control amount Ph from the surface temperature feedback circuit 73 are input (step S100). Subsequently, it is determined whether or not the value of the control switching flag Fs is 0 (step S110). Here, the control switching flag Fs is a flag indicating whether or not it is during an initial heating period, which is a period during which the output of the heater 40 is controlled by the surface temperature feedback control. The control switching flag Fs is set to an initial value 0 at the start of the heater control routine, is continuously set to a value 0 during the initial heating period, and is set to a value 1 when the initial heating period ends. Since the start of the heater control routine is considered now, the control switching flag Fs is 0, and a positive determination is made in step S110.

  If an affirmative determination is made in step S110, the timer start oil temperature K1 and the timer end oil temperature K2 are derived and set by equations (1) and (2), respectively (step S120). Here, the timer start oil temperature K1 and the timer end oil temperature K2 are oil temperatures that serve as a reference for deriving an initial oil temperature increase rate Rs that is the amount of increase in oil temperature per unit time in the initial heating period. , K1 <K2. Derivation of the initial oil temperature rise rate Rs will be described later.

K1 = Kq * −20 (1)
K2 = Kq * -10 (2)

  Subsequently, whether or not the previous value of the oil temperature Kq input in step S100 is less than the timer start oil temperature K1 and the current value is equal to or higher than the timer start oil temperature K1, that is, the oil temperature Kq is the timer start oil temperature K1 for the first time. It is determined whether it exceeds (step S130). The control circuit 71 stores the latest value of the oil temperature Kq input in step S110 from the start of the heater control routine for a predetermined time (in this embodiment, for 5 minutes) in an internal memory (not shown) in chronological order. The determination in step S130 is performed using this value. Now, the execution of the first heater control routine after the user gives an instruction is considered, and there is no previous value, so a negative determination is made in step 130.

  If a negative determination is made in step S130, whether or not the previous value of the oil temperature Kq input in step S100 is less than the timer end oil temperature K2 and the current value is greater than or equal to the timer end oil temperature K2, that is, oil It is determined whether or not the temperature Kq has exceeded the timer end oil temperature K2 for the first time (step S150). This determination can also be made in the same manner as in step S130. Now, considering the start of the heater control routine, there is no previous value, so a negative determination is made at step 150.

  If a negative determination is made in step S150, it is determined whether the switching reference oil temperature Ks is not set or the current value of the oil temperature Kq is less than the switching reference oil temperature Ks (step S180). Here, the switching reference oil temperature Ks is a value serving as a reference for determining whether or not the present is in the initial heating period, and when the switching reference oil temperature Ks is not set in a step described later, or the oil temperature Kq. Is less than the switching reference oil temperature Ks, it is considered that the initial heating period is in progress. Now, considering the start of the heater control routine, since the switching reference oil temperature Ks is not set, a positive determination is made.

  If an affirmative determination is made in step S180, the present value of the surface temperature control amount Ph is output to the heater unit 41 assuming that it is currently in the initial heating period (step S190), and this routine is terminated. . As a result, the heater unit 41 causes a current corresponding to the surface temperature control amount Ph to flow through the heater 40 and heats the oil 20 by the surface temperature feedback control to increase the oil temperature Kq. Thereafter, the heater control routine is executed every second, and the above-described steps S100 to S130, S150, S180, and S190 are repeatedly executed until the oil temperature Kq exceeds the timer start oil temperature K1 for the first time. .

  When the oil temperature Kq exceeds the timer start oil temperature K1 for the first time, a positive determination is made in step S130, the timer Ts starts counting, and the value of the timer start oil temperature Ka is set to the current value of the oil temperature Kq. (Step S140), the process proceeds to step S150. Then, until the oil temperature Kq exceeds the timer end oil temperature K2 for the first time and an affirmative determination is made in step S150, the processes of steps S100 to 130, S150, S180, and S190 described above are repeatedly performed. Become.

  When the oil temperature Kq exceeds the timer end oil temperature K2 for the first time, an affirmative determination is made in step S150, which is the amount of increase in the oil temperature Kq per unit time from the start of the timer count to the end of the initial heating period. The initial oil temperature rise rate Rs is derived and set by equation (3) (step S160). Note that Ts in Equation (3) is the count value (seconds) of the timer Ts when step S160 is executed.

  Rs = (Kq current value−Ka) / Ts (3)

  Subsequently, the switching reference oil temperature Ks is derived and set based on the oil temperature target value Kq * and the initial oil temperature increase rate Rs (step S170), and the process proceeds to step S180. Here, the relationship among the oil temperature target value Kq *, the initial oil temperature increase rate Rs, and the switching reference oil temperature Ks is shown in FIG. As shown in FIG. 3, the switching reference oil temperature Ks is Ks = Kq * -1 when the initial oil temperature increase rate Rs = Rs1, and is Ks = Kq * -4 when the initial oil temperature increase rate Rs = Rs2. The value is such that the larger the initial oil temperature rise rate Rs, the smaller the linearity. The control circuit 71 stores the relationship shown in FIG. 3 as a map, and can derive the switching reference oil temperature Ks from this map using the oil temperature target value Kq * and the initial oil temperature increase rate Rs. . Note that the values Rs1 and Rs2 can be determined as appropriate by experiments, for example.

  When the switching reference oil temperature Ks is set, in the subsequent step S180, when the current value of the oil temperature Kq is less than the switching reference oil temperature Ks, an affirmative determination is made, and it is considered that the initial heating period is being performed as described above. In step S190, the surface temperature feedback control is continued. On the other hand, when the oil temperature Kq rises and becomes equal to or higher than the switching reference oil temperature Ks, a negative determination is made in step S180, and the control switching flag Fs is set to a value 1 assuming that the initial heating period has ended (step 1). (S200), the current value of the oil temperature control amount Pq is output to the heater unit 41 (step S210), and this routine is terminated. As a result, the heater unit 41 causes a current corresponding to the oil temperature control amount Pq to flow through the heater 40, and heating of the oil 20 by the oil temperature feedback control is started.

  When the control switching flag Fs is set to the value 1, in the subsequent heater control routine, a negative determination is made in step S110, and an input determination routine for determining whether or not the food has been input to the oil tank 30 is executed ( Step S220).

  Here, the insertion determination routine will be described. FIG. 4 is a flowchart illustrating an example of the insertion determination routine. When this injection determination routine is executed, the control circuit 71 first derives the oil temperature decrease rate Rd, which is the amount of decrease in the oil temperature Kq per unit time from the time Td seconds ago to the present, using the equation (4). (Step S400). In addition, although the value of time Td in Formula (4) is 15 seconds in this embodiment, what is necessary is just to set suitably to the value which can detect the injection | throwing-in of cooking quickly and does not raise | generate a misdetection.

  Rd = (Kq−Kq current value before Td seconds) / Td (4)

  Subsequently, an input detection decrease rate Rr, which is a threshold value of the oil temperature decrease rate Rd that the cooked food is input, is derived and set based on the initial oil temperature increase rate Rs (step S410). Here, the relationship between the initial oil temperature increase rate Rs and the input detection decrease rate Rr is shown in FIG. As shown in FIG. 5, the input detection decrease amount Rr has a relationship that increases as the initial oil temperature increase rate Rs increases. The control circuit 71 stores the relationship shown in FIG. 5 as a map, and can use the value of the initial oil temperature increase rate Rs to derive the input detection decrease rate Rr. In addition, this map can be suitably calculated | required by experiment, for example.

  Then, it is determined whether or not the oil temperature decrease rate Rd is greater than the input detection decrease rate Rr (step S420). If an affirmative determination is made, it is considered that the food has been input, and the food input flag Fr has a value of 1. (Step S430). Here, the cooked food input flag Fr is a flag that is set to a value of 1 when the food is charged and the oil temperature Kq can be regarded as rapidly decreasing, and is set to a value of 0 when the food temperature is not. The cooked material input flag Fr is set to an initial value 0 at the start of the heater control routine.

  On the other hand, if a negative determination is made in step S420, it is determined whether or not the food input flag Fr is 1 (step S440). If a positive determination is made, the first return oil temperature Kr1. Is derived and set by equation (5) (step S450), and it is determined whether or not the current value of the oil temperature Kq is greater than the first return oil temperature Kr1 (step S460). Here, the first return oil temperature Kr1 is a reference value for determining whether or not the product has been returned from a state in which it is considered that the oil temperature Kq has suddenly decreased due to the addition of the food.

  Kr1 = Kq * −Td × Rr (5)

  Then, if a positive determination is made in step S460, it is considered that the food has been returned and the oil temperature Kq has been rapidly reduced, and the food input flag Fr is set to a value of 0 ( Step S470). If a negative determination is made in step S460, the process proceeds to step S430, and the state where the food input flag Fr = 1 is continued.

  On the other hand, if a negative determination is made in step S440, the process proceeds to step S470, and the state of the cooked product input flag Fr = 0 is continued.

  Then, when the value of the cooked product input flag Fr is set in step S430 or S470, the input detected oil temperature Kd, which is a threshold value of the oil temperature Kq that the oil temperature Kq is considered to have decreased due to the input of the cooked product, is set as the oil temperature target value Kq. * Derived and set based on the initial oil temperature rise rate Rs (step S480). Here, the relationship among the oil temperature target value Kq *, the initial oil temperature increase rate Rs, and the input detection oil temperature Kd is shown in FIG. As shown in FIG. 6, the input detection oil temperature Kd is Kd = Kq * -2 when the initial oil temperature rise rate Rs = Rs1, and Kd = Kq * -5 when the initial oil temperature rise rate Rs = Rs2. The value is such that the larger the initial oil temperature rise rate Rs, the smaller the linearity. The control circuit 71 stores the relationship shown in FIG. 6 as a map, and can derive the input detected oil temperature Kd from this map using the oil temperature target value Kq * and the initial oil temperature rise rate Rs. .

  Subsequently, it is determined whether or not the current value of the oil temperature Kq is lower than the input detection oil temperature Kd (step S490), and when a positive determination is made, it is considered that the cooked food is input and the oil temperature Kq has decreased. Then, the food input flag Fd is set to 1 (step S500), and this routine is terminated. Here, the cooked product input flag Fd is a flag that is set to a value of 1 when the cooked product is input and the oil temperature Kq can be regarded as lowered, and set to a value of 0 when the cooked product is not. The cooked material input flag Fd is set to an initial value 0 at the start of the heater control routine.

  On the other hand, if a negative determination is made in step S490, it is determined whether or not the food input flag Fd is a value 1 (step S510). If a positive determination is made, the food is input. The second return oil temperature Kr2, which is a reference value for determining whether or not the oil temperature Kq has been reduced from the state that can be regarded as lowered, is derived and set by the equation (6) (step S520), and the current value of the oil temperature Kq Is greater than the second return oil temperature Kr2 (step S530).

  Kr2 = Kd + 1 (6)

  Then, if a positive determination is made in step S530, it is considered that the food has been charged and the oil temperature has fallen, and the food charging flag Fr is set to 0 (step S540). This routine ends. If a negative determination is made in step S530, the process proceeds to step S500, the state of the cooked product input flag Fr = 1 is continued, and this routine is terminated.

  On the other hand, if a negative determination is made in step S510, the process proceeds to step S540, and the state of the cooked material input flag Fr = 0 is continued and this routine is terminated.

  When the oil temperature Kq is drastically decreased as the oil temperature drop rate Rd exceeds the input detection drop rate Rr by the input determination routine described above, the oil temperature Kq exceeds the first return oil temperature Kr1. The cooked food input flag Fr is set to a value of 1, and when the oil temperature Kq falls below the detected input oil temperature Kd even if the oil temperature Kq does not decrease rapidly, the food is heated until the oil temperature Kq exceeds the second return oil temperature Kr2. The input flag Fr is set to a value of 1.

  Returning to the description of the heater control routine. When the charging determination routine executed in step S220 is completed, it is determined whether or not at least one of the food charging flags Fr and Fd is 1 (step S230). If a negative determination is made in step S220, it is determined that the cooked product has not been put in, the process proceeds to step S210, the oil temperature feedback control is continued, and this routine is terminated. On the other hand, if a positive determination is made in step S220, the high output control amount Pf is output to the heater unit 41 (step S240), and this routine is terminated. Note that the high output control amount Pf is a predetermined high output value, and in this embodiment is a control amount that sets the output of the heater 40 to 100%, but the heater is more effective than when the oil temperature feedback control is executed. Any value can be used as long as the output of 40 is a high output. As a result, the heater unit 41 causes a current corresponding to the high output control amount Pf to flow through the heater 40, and the oil 20 is heated at a predetermined high output.

  The heater control routine described above is repeatedly executed until the user instructs to end the heating of the heater 40 by operating the operation unit 62. When stopping the repetition of the heater control routine, the stored oil temperature Kq for 5 minutes, various values set in the heater control routine and the charging determination routine are cleared, and various flags are set to initial values.

  Here, the oil temperature Kq * = 180 ° C., the surface temperature target value Kh * = 230 ° C., and the oil temperature Kq = 30 ° C. at the start of the heater control routine is taken as an example. A state of stabilization near the oil temperature target value Kq * will be described with reference to FIG. When the heater control routine is started at time t0, after step S100 is executed, the control switching flag Fs has an initial value of 0, so a negative determination is made in step S110 and the processing in step S120 is executed. Using the temperature target value Kq * = 180 ° C., the timer start oil temperature K1 = 160 ° C. and the timer end oil temperature K2 = 170 ° C. are set according to equations (1) and (2). Since the heater control routine is executed for the first time and there is no previous value of the oil temperature Kq, a negative determination is made in steps S130 and S150, and the switching reference oil temperature Ks is also not set, and thus negative in step S180. A determination is made and the surface temperature control amount Ph is output to the heater unit 41 in step S190. Thereafter, the heater control routine is repeated, and until the time t1 when the oil temperature Kq exceeds the timer start oil temperature K1 for the first time, the processing of steps S100 to 130, S150, S180, and S190 is repeatedly executed, and the heater 40 is oiled by surface temperature feedback control. 20 is heated.

  When the oil temperature Kq exceeds the timer start oil temperature K1 for the first time at time t1 (see the enlarged portion at time t1 to t2 in FIG. 7), an affirmative determination is made in step S130, and the process of step S140 is executed. As a result, the count of the timer Ts is started from the time t1, and the oil temperature Ka at the start of the timer is set to a value 160.2 ° C. that is the oil temperature Kq at the time t1. And since negative determination is made in step S150, S180, the process of step S190 is performed. Thereafter, until the time t2 when the oil temperature Kq exceeds the timer end oil temperature K2 for the first time, the processes of steps S100 to 130, S150, S180, and S190 are repeatedly executed in the same manner as from the time t0 to before the time t1, and the surface temperature feedback is performed. Control continues.

  When the oil temperature Kq exceeds the timer end oil temperature K2 for the first time at time t2, a positive determination is made in step S150, and the process of step S160 is executed. As a result, the current value 170.1 ° C. of the oil temperature Kq at time t2, the timer start oil temperature Ka = 160.2 ° C. set in step S140, and the value of the timer Ts (t2-t1) are substituted into the equation (3). By doing so, the initial oil temperature increase rate Rs is set. The initial oil temperature increase rate Rs is equal to the slope of the straight line connecting point A and point B shown in FIG. Subsequently, the process of step S170 is executed, and the switching reference oil temperature Ks is derived from the map shown in FIG. 3 using the oil temperature target value Kq * = 180 ° C. and the set initial oil temperature increase rate Rs. Set. Here, the following description will be made assuming that the switching reference oil temperature Ks = 178 ° C. is set. The switching reference oil temperature Ks is set, but the oil temperature Kq = 170.1 ° C. is lower than the switching reference oil temperature Ks. Therefore, a positive determination is made in step S180, and the process of step S190 is executed. The Thereafter, until time t3 when the oil temperature Kq becomes equal to or higher than the switching reference oil temperature Ks, the processes of steps S100 to 130, S150, S180, and S190 are repeatedly executed, and the surface temperature feedback control is continued.

  When the oil temperature Kq becomes equal to or higher than the switching reference oil temperature Ks at time t3, a negative determination is made in step S180, and it is considered that the initial heating period has ended. In step S200, the control switching flag Fs is set to a value of 1. In step S210, the oil temperature control amount Pq is output to the heater unit 41, and the oil temperature feedback control is started. Thereafter, since the control switching flag Fs has a value of 1, a negative determination is made in step S110, and an insertion determination routine is executed in step S220.

  When the injection determination routine is executed, the oil temperature decrease rate Rd is set according to the equation (4) in step S400, and the input detection decrease rate Rr from the map shown in FIG. 5 using the initial oil temperature increase rate Rs in step S410. Is set. Here, the following description will be made assuming that the input detection descent rate Rr = 1/15 (° C./s). As shown in FIG. 7, immediately after time t3, the oil temperature Kq tends to increase, and the oil temperature decrease rate Rd becomes a negative value. Therefore, a negative determination is made in step S420. Subsequently, since the food input flag Fr has an initial value of 0, a negative determination is also made in step S440, and the process proceeds to step S470, where the food input flag Fr is continuously set to 0. When the food input flag Fr is set, the input detection oil temperature Kd is set from the map shown in FIG. 6 using the oil temperature target value Kq * = 180 ° C. and the initial oil temperature increase rate Rs in step S480. Here, the following description will be made assuming that the input detection oil temperature Kd is set to 177 ° C. Then, as shown in FIG. 7, immediately after time t3, the oil temperature Kq is greater than the input detection oil temperature Kd = 177 ° C., so a negative determination is made in step S490. Subsequently, since the food input flag Fd has an initial value of 0, a negative determination is also made in step S510, and the process proceeds to step S540, where the food input flag Fd is continuously set to a value of 0 and the input determination routine is terminated. To do.

  When the input determination routine is completed, the process proceeds to step S230 of the heater control routine, and since the food input flags Fr and Fd are both 0, a negative determination is made and the process of step S210 is executed. Thereafter, from time t3 to time t39 (see the enlarged portion of time t4 to t5 in FIG. 7), the oil temperature Kq does not significantly decrease, and steps S420, S440, and S490 of the insertion determination routine. , S510 is negatively determined, and the cooking input determination flags Fr and Fd are continuously set to the value 0. Accordingly, a negative determination is made in step S230 of the heater control routine, and the oil temperature feedback control is continued. Thereby, the oil temperature Kq becomes a substantially stable value near the oil temperature target value Kq * = 180 ° C.

  When the cooked material is thrown in at time t39, the oil temperature Kq rapidly decreases as shown in FIG. Then, a negative determination is made in step S420 until the oil temperature decrease rate Rd set in step S400 exceeds the input detection decrease rate Rr = 1/15 (° C./second), and the oil temperature Kq becomes the input detection oil temperature. A negative determination is made in step S490 until the oil temperature Kq falls below 177 ° C., and the oil temperature feedback control is continued as described above. However, at time t4 10 seconds after time t39, the oil temperature Kq reaches 179 ° C. When the lower oil temperature drop rate Rd exceeds the input detection drop rate Rr for the first time, a positive determination is made in step S420. Thereby, it progresses to step S430 and the cooking input flag Fr is set to the value 1. Thereafter, in step S450, the oil temperature target value Kq * = 180 ° C., the input detection descent rate Rr = 1/15 (° C./second), and the time Td = 15 seconds are set by the equation (5). The cooking input flag Fr continues to be set to the value 1 until time t5 when the oil temperature Kq exceeds the value of the return oil temperature Kr1 = 179 ° C. At time t41, the oil temperature Kq falls below the input detection oil temperature Kd = 177 ° C. for the first time, a positive determination is made in step S490, and the food input flag Fd is set to the value 1. Thereafter, until the time t42 when the oil temperature Kq exceeds the value of the second return oil temperature Kr2 = 178 ° C. set by the equation (6) using the input detection oil temperature Kd = 177 ° C. in step S520, the food is charged. The flag Fr continues to be set to the value 1. In step S230 after the insertion determination routine, a positive determination is made when either of the food input flags Fr and Fd is 1, so that, as can be seen from FIG. 7, from time t4 to time t5, In step S240, the high output control amount Pf is output to the heater unit 41, and the output of the heater 40 continues to be 100%. In addition, after time t5, the cooked material insertion flags Fr and Fd both have a value of 0, so that a negative determination is made in step S230, the process proceeds to step S210, and the oil temperature feedback control is resumed.

  Next, the abnormality determination process will be described. FIG. 8 is a flowchart illustrating an example of the abnormality determination routine. This routine is stored in an internal memory (not shown) of the control circuit 71, and is repeatedly executed at predetermined time intervals (in this embodiment, every second) during execution of the heater control routine.

  When this abnormality determination routine is executed, the control circuit 71 first inputs the oil temperature Kq from the oil temperature sensor 51 and the surface temperature Kh from the surface temperature sensor 52 (step S600). Subsequently, it is determined whether the surface temperature Kh is equal to or higher than the first abnormal surface temperature Khref1 or whether the oil temperature Kq is equal to or higher than the abnormal oil temperature Kqref (step S610). Here, the first abnormal surface temperature Khref1 is a threshold value for determining whether or not the temperature is abnormally high due to poor control of the heater 40 or the heater unit 41, and is set to 300 ° C. in the present embodiment. However, other values may be used. The abnormal oil temperature Kqref is a threshold value for determining whether or not the oil 20 is at an abnormally high temperature by the heater 40 due to poor control, and is set to 250 ° C. in this embodiment. It may be a value.

  If an affirmative determination is made in step S610, it is determined that a control failure has occurred in the heater 40 or the heater unit 41, the currently executed heater control routine is terminated, and the power of the heater unit 41 (not shown) is forced. The heater 40 is turned OFF to stop the heat generation of the heater 40, and an alarm command is output to the operation panel 60 so as to give an alarm or display informing the user of an abnormality (step S620), and this routine is terminated.

  On the other hand, if a negative determination is made in step S610, an oil temperature increase rate Ru, which is an increase amount of the oil temperature Kq per unit time from the time Tu seconds before to the present time, is derived from the equation (7) (step S630). ). The control circuit 71 stores the latest value of the oil temperature Kq input in step S600 from the start of the abnormality determination routine for a predetermined time (in this embodiment, 5 seconds) in an internal memory (not shown) in chronological order. The determination in step S630 is performed using this value. In addition, the value of the time Tu in the expression (7) is 5 seconds in the present embodiment, but it may be set as appropriate to a value that allows an abnormality to be detected promptly and is unlikely to cause a false detection.

  Ru = (Kq-Kq current value before Tu seconds) / Tu (7)

  Subsequently, it is determined whether or not the oil temperature increase rate Ru is equal to or higher than the abnormal oil temperature increase rate Ruref (step S640). Here, the abnormal oil temperature increase rate Ruref is a threshold value for determining whether or not the oil temperature is abnormally rapidly increased due to poor control of the heater 40 or the heater unit 41. If an affirmative determination is made in step S640, it is determined that a control failure has occurred in the heater 40 or heater unit 41, the process proceeds to step S620, and this routine is terminated.

  On the other hand, if a negative determination is made in step S640, it is determined whether or not the surface temperature Kh is equal to or higher than the second abnormal surface temperature Khref2 (step S650). Here, the second abnormal surface temperature Khref2 is a threshold value for determining whether or not the surface temperature Kh of the heater 40 may rise and exceed the smoke point of the oil 20. The second abnormal surface temperature Khref2 is set to 232 ° C. in the present embodiment, but may be another value, or may be a value that tends to decrease as the initial oil temperature increase rate Rs increases. .

  If an affirmative determination is made in step S650, the abnormality flag Fe is set to 1 (step S660). Here, the abnormality flag Fe is set to a value of 1 when the surface temperature Kh of the heater 40 increases and may exceed the smoke point of the oil 20, and is set to a value of 0 when there is no risk of exceeding the smoke point. The abnormality flag Fe is set to an initial value of 0 at the start of the first abnormality determination routine when the power is turned on. When the abnormality flag Fe is set to a value 1, a command is transmitted to the heater unit 41 to forcibly set the current flowing through the heater 40 to 0 (step S700), and this routine is terminated. Thereby, the output of the heater 40 is stopped regardless of the control amount of the heater unit 41 determined by the heater control routine, and the surface temperature Kh is lowered.

  If a negative determination is made in step S650, it is determined whether or not the abnormality flag Fe is a value 1 (step S670). If it is determined that the value is 1, the surface temperature Kh is equal to or lower than the third abnormal surface temperature Khref3. It is determined whether or not (step S680). Here, the third abnormal surface temperature Khref3 is a threshold value for determining whether or not the surface temperature Kh of the heater 40 has decreased to a temperature at which there is no risk of exceeding the smoke point of the oil 20, and in this embodiment 230 ° C. Is set to If a negative determination is made in step S680, it is determined that the surface temperature Kh is still high, the processing in steps S660 and S700 described above is executed, and this routine is terminated.

  On the other hand, if a negative determination is made in step S670 or a positive determination is made in step S680, the surface temperature Kh has dropped to a temperature at which there is no risk of exceeding the smoke point of the oil 20, and there is no abnormality. Determination is made, the abnormality flag Fe is set to 0 (step S690), and this routine is terminated.

  By executing the abnormality determination routine as described above, when the surface temperature Kh and the oil temperature Kq are abnormally high, the heater 40 is forcibly turned off and an alarm or display for notifying the user of the abnormality is displayed. Therefore, it can be a safe flyer. Further, when the surface temperature Kh rises and the smoke point of the oil 20 may be exceeded, the output of the heater 40 is forcibly stopped, so that a safer fryer can be obtained, and the generation of oil smoke and the oil temperature Oxidation of the oil 20 due to an increase in Kq can be suppressed, and consumption of the oil 20 can be reduced.

  Here, the correspondence between the components of the present embodiment and the components of the present invention will be clarified. The heater 40 and heater unit 41 of this embodiment correspond to heating means, the control unit 70 corresponds to control means, and the control circuit 71 sets input detection descent rate setting means, input detection oil temperature setting means, and switching reference oil temperature setting. Corresponds to means.

  According to the embodiment described in detail above, the oil tank 30 is executed by the charging determination routine during the execution of the oil temperature feedback control that feedback-controls the output of the heater 40 so that the oil temperature Kq in the oil tank 30 becomes the oil temperature target value Kq *. It is determined whether or not the cooked food has been put in, and the values of the cooked food throwing flags Fr and Fd are set. When either of the food input flags Fr and Fd has a value of 1, it is determined that the food has been input, and during the period until both of the food input flags Fr and Fd have a value of 0, the oil temperature When high output control is performed to control the heater 40 at a predetermined high output so that the output becomes higher than when feedback control is performed, and both of the food input flags Fr and Fd become 0, cooking The oil temperature feedback control is resumed by determining that the oil temperature has been reduced due to the input of the object. By doing so, the output of the heater 40 can be set to a high output during the period in which the oil temperature Kq is lowered due to the input of the cooked food, and the downshoot of the oil temperature Kq can be suppressed, and the oil temperature from the low oil temperature state when the food is charged can be suppressed. The recovery time can be shortened. Therefore, the oil temperature Kq can be further stabilized near the oil temperature target value Kq *.

  Further, since it is determined that the cooked food has been thrown in when the oil temperature drop rate Rd exceeds the throw detection drop rate Rr, and the cook food throwing flag Fr is set to the value 1, it is possible to more appropriately detect the thrown-in food. Furthermore, since the input detection decrease rate Rr is set so as to increase as the initial oil temperature increase rate Rs increases, more appropriate input detection of the food can be performed in consideration of conditions such as the amount of oil, oil type, and outside temperature. .

  Further, when the oil temperature Kq is lower than the input detection oil temperature Kd set to a value lower than the oil temperature target value Kq *, it is determined that the food has been input, and the food input flag Fd is set to the value 1, The input of the food can be detected more appropriately. Furthermore, since the input detection oil temperature Kd is set so as to decrease as the initial oil temperature rise rate Rs increases, more appropriate input detection of the food can be performed in consideration of conditions such as the amount of oil, oil type, and outside air temperature. .

  In addition, when the oil temperature Kq exceeds the first return oil temperature Kr1 set to a value lower than the oil temperature target value Kq *, the cooked material is charged and the oil temperature Kq returns from a state in which it can be considered that the oil temperature Kq has rapidly decreased. And the cooked product input flag Fr is set to the value 0, and the cooked product is input when the oil temperature Kq exceeds the second return oil temperature Kr2 set to a value lower than the oil temperature target value Kq *. It determines with having returned from the state which can consider that oil temperature Kq fell, and sets the cooking input flag Fd to the value 0. Thereby, the oil temperature feedback control can be resumed more appropriately, and the overshoot of the oil temperature can be suppressed. Therefore, the oil temperature Kq is stabilized near the target value sooner after the food is charged, and the power consumption of the heater 40 can be reduced. Moreover, since the overshoot of the oil temperature is suppressed, the oxidation of the oil 20 due to the increase in the oil temperature Kq can be suppressed, and the consumption amount of the oil 20 can be reduced.

  Further, during the initial heating period, surface temperature feedback control is performed in which the output of the heater unit 72 is feedback-controlled so that the surface temperature Kh of the heater 40 becomes a surface temperature target value Kh * higher than the oil temperature target value Kq *. At the same time, during the execution of the surface temperature feedback control, it is determined whether or not the oil temperature Kq is lower than the switching reference oil temperature Ks set to a value lower than the oil temperature target value Kq *, and a positive determination is made. For example, the surface temperature feedback control is continued during the initial heating period. If a negative determination is made, the oil temperature feedback control is executed assuming that the initial heating period has ended. Thereby, during the initial heating period, the output of the heater 40 can be increased by the surface temperature feedback control, and the oil temperature Kq can be brought close to the oil temperature target value Kq * in a short time, and the oil temperature Kq becomes the oil temperature target value Kq *. After approaching, the oil temperature feedback control can stabilize the oil temperature Kq near the oil temperature target value Kq * while suppressing the overshoot. Therefore, the oil temperature Kq can be raised in a shorter time from the start of heating and stabilized near the oil temperature target value Kq *. Further, by suppressing the overshoot of the oil temperature Kq, the power consumption of the heater 40 can be reduced, and the oxidation of the oil 20 due to the rise of the oil temperature Kq can be suppressed, and the consumption of the oil 20 can be reduced. Furthermore, since the switching reference oil temperature Ks is set so as to decrease as the initial oil temperature rise rate Rs increases, the overshoot of the oil temperature Kq can be further suppressed in consideration of conditions such as the oil amount, oil type, and outside air temperature. .

  It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be implemented in various modes as long as it belongs to the technical scope of the present invention.

  For example, in the above-described embodiment, when a negative determination is made in step S110 of the heater control routine, the making determination routine is executed, but when the making determination routine is not executed and a negative determination is made in step S110, It is also possible to always proceed to step S210 and execute the oil temperature feedback control. Even in this case, the oil temperature can be stabilized near the oil temperature target value in a shorter time from the start of heating.

  In the above-described embodiment, the timer start oil temperature K1 and the timer end oil temperature K2 are set by the equations (1) and (2), but K1 <K2, and the timer start oil temperature K1 and the timer end oil temperature K2 are switched. It may be set in any way as long as it is lower than the reference oil temperature Ks. For example, K1 may be (Kq * -30), or may be a constant value regardless of Kq *.

  In the above-described embodiment, the initial oil temperature increase rate Rs is set to a value set by the equation (3). However, any method may be used as long as the value represents an increase amount per unit time of the oil temperature Kq in the initial heating period. It may be a value. For example, the oil temperature Kq after a predetermined time ta from the start of heating and the oil temperature Kq after the predetermined time tb (> ta) from the start of heating may be derived and set.

  In the above-described embodiment, the switching reference oil temperature Ks and the input detection oil temperature Kd are derived and set from the maps shown in FIGS. 3 and 6 using the oil temperature target value Kq * and the initial oil temperature increase rate Rs. However, as the initial oil temperature rise rate Rs is larger, it tends to be smaller and may be derived from any map as long as it is lower than the oil temperature target value Kq *. For example, the map may be set based only on the initial oil temperature increase rate Rs. Further, it may be a map in which the slope changes depending on the value of the oil temperature target value Kq *, a map in which the initial oil temperature rise rate Rs increases, or a map that tends to decrease in a curve, or a switching reference oil The temperature Ks may not take a continuous value. Furthermore, it suffices if the initial oil temperature rise rate Rs tends to decrease as a whole. As the initial oil temperature rise rate Rs increases, the switching reference oil temperature Ks and the input detection oil temperature Kd decrease in a step function. May be. Furthermore, the switching reference oil temperature Ks and the input detection oil temperature Kd may be irrelevant to the initial oil temperature increase rate Rs as long as the values are lower than the oil temperature target value Kq *. For example, it may be a preset fixed value.

  In the above-described embodiment, the input detection decrease rate Rr is derived and set using FIG. 5 using the initial oil temperature increase rate Rs. However, if the initial oil temperature increase rate Rs increases, You may derive and set from a map. For example, it may be a map in which the slope changes according to the value of the oil temperature target value Kq *, a map that tends to increase in a curve as the initial oil temperature increase rate Rs increases, or an input detection drop The rate Rr may not take a continuous value. Further, as a whole, the larger the initial oil temperature increase rate Rs is, the more the tendency is to increase. Further, the input detection decrease rate Rr may be independent of the initial oil temperature increase rate Rs. For example, it may be a preset fixed value.

  In the above-described embodiment, the first return oil temperature Kr1 and the second return oil temperature Kr2 are derived and set by the equations (5) and (6). However, what is the value lower than the oil temperature target value Kq *? May be set. For example, the first return oil temperature Kr1 and the second return oil temperature Kr2 may be the same value, or may be a predetermined fixed value.

  In the above-described embodiment, when a positive determination is made in step S460 or step S530 and the food input flags Fr and Fd are both set to the value 0, the oil temperature feedback control after the food input is resumed. The oil temperature feedback control may be resumed depending on the condition. For example, the high output control may be performed only for a predetermined time after it is assumed that the cooked food has been input.

  In the embodiment described above, the surface temperature target value Kh * is set in advance, but may be set in any way as long as it is higher than the oil temperature target value Kq *. For example, the oil temperature target value Kq * may be set so as to increase as the oil temperature target value Kq * increases.

  In the above-described embodiment, the input detection routine detects the input of the cooked food using the input detection descent rate Rr and the input detection oil temperature Kd. However, the processing of steps S480 to S540 is omitted and the input detection descent rate Rr. Only the input of the cooked food may be detected, or the processing of steps S410 to S470 may be omitted, and the input of the cooked food may be detected only by the input detection oil temperature Kd. Moreover, you may consider that the cooked material was thrown in only when both steps S420 and S490 are affirmatively determined.

  In the above-described embodiment, the high output control amount Pf in step S240 is set to a predetermined high output value, but control is performed such that the output of the heater 40 is higher than when the oil temperature feedback control is executed. Any value can be used as long as it is a quantity. For example, the heater 40 may be set to a high output value that is predetermined but not constant, such as the heater 40 having an output of 100% for the first minute and an output of 90% thereafter. Similarly to the surface temperature feedback control in the initial heating period, the PID control is performed so that the difference between the cooking surface temperature target value set as a value higher than the oil temperature target value Kq * and the surface temperature Kh becomes zero. The derived control amount may be the high output control amount Pf. In this case, the cooking surface temperature target value may be the same value as the surface temperature target value Kh *, or may be a different value. The gain of the PID control in this case may be the same value as the surface temperature feedback control in the initial heating period or may be a different value.

  In the above-described embodiment, the surface temperature feedback control is executed during the initial heating period, but a predetermined high output control may be performed during the initial heating period. For example, the output of the heater 40 may be 100%. Even in this case, the oil temperature Kq can be brought close to the oil temperature target value Kq * in a short time from the start of heating.

  In the embodiment described above, the value detected by the oil temperature sensor 51 is set as the oil temperature Kq. However, the oil temperature sensor is installed at a plurality of different locations in the oil tank 30, and the value detected by the plurality of oil temperature sensors. The average value may be the oil temperature Kq, or the highest value may be the oil temperature Kq. The same applies to the surface temperature sensor 52.

  10 fryer, 20 oil, 30 oil tank, 40 heater, 41 heater unit, 51 oil temperature sensor, 52 surface temperature sensor, 60 operation panel, 61 display section, 62 operation section, 70 control section, 71 control circuit, 72 oil temperature feedback Circuit, 73 Surface temperature feedback circuit.

Claims (10)

An oil tank for storing oil;
Heating means for heating the oil in the oil tank;
In the initial heating period, which is an initial period for heating the oil, the heating is performed such that the surface temperature of the heating means becomes a surface temperature target value for initial heating set to a value higher than a predetermined oil temperature target value. The surface temperature feedback control for feedback control of the output of the means is executed, and the oil temperature in the oil tank is lower than the switching reference oil temperature set to a value lower than the oil temperature target value during the execution of the surface temperature feedback control. If a positive determination is made, it is considered that the initial heating period is in progress, and the surface temperature feedback control is continued. If a negative determination is made, the initial heating period Control means for performing oil temperature feedback control for feedback control of the output of the heating means so that the oil temperature becomes the oil temperature target value,
With a flyer. The flyer according to claim 1 ,
A switching reference oil temperature setting means for setting the switching reference oil temperature so as to decrease as the initial oil temperature increase rate representing the amount of increase in the oil temperature per unit time in the initial heating period increases,
With a flyer. Wherein the control unit determines whether a predetermined food put conditions that can be regarded as the food is turned before Symbol oil temperature feedback control of the oil vessel during execution is satisfied, the food put conditions Is satisfied, during the period until the predetermined return condition is satisfied, high output control is performed to control the output of the heating means to be higher than when the oil temperature feedback control is performed. , restart the oil temperature feedback control after the formation of the return condition,
The flyer according to claim 1 or 2 . The cooked material input condition is a condition that an oil temperature decrease rate representing a decrease amount per unit time of the oil temperature exceeds a predetermined input detection decrease rate.
The flyer according to claim 3 . A flyer according to claim 4 , wherein
An input detection descent rate in which the input detection descent rate is set to increase as the initial oil temperature increase rate indicating the amount of increase in the oil temperature per unit time in the initial heating period, which is the initial period for heating the oil, increases. Setting means,
With a flyer. The cooking input condition is a condition that the oil temperature is lower than an input detection oil temperature set to a value lower than the oil temperature target value.
The flyer according to claim 3 . The flyer according to claim 6 , wherein
An input detection oil temperature that sets the input detection oil temperature so as to decrease as the initial oil temperature increase rate indicating the amount of increase in the oil temperature per unit time in the initial heating period, which is an initial period of heating the oil, becomes smaller. Setting means,
With a flyer. The return condition is a condition that the oil temperature exceeds a return oil temperature set to a value lower by a predetermined allowable amount than the oil temperature target value.
The flyer according to any one of claims 3 to 7 . The high output control is a control for causing the output of the heating means to be a predetermined high output.
The flyer according to any one of claims 3 to 8 . The high output control is to feedback control the output of the heating means so that the surface temperature of the heating means becomes a cooking surface temperature target value set to a value higher than the oil temperature target value.
The flyer according to any one of claims 3 to 8 .

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