JPH03144811A - Method and device for controlling temperature of cooker - Google Patents

Abstract

PURPOSE:To reduce the temperature ripple by energizing a heater at such a rate that causes no rise of the temperature of a heating room when this heating chamber temperature is higher than a target control level. CONSTITUTION:A 2nd energization rate setting part 88 controls both energizing and non-energizing periods of a relay 46 so as to secure a <=100% energization rate when T1>T3>=T2 is satisfied among a 1st target control temperature T1, a 2nd target control temperature T2, and a temperature T3 in a heating chamber 4 respectively. That is, the 100% energization rate applied at start of energization to a heater is reduced when the heating chamber temperature is higher than a target control level. At the same time, heater is energized at such an energization rate that does not increase the heating chamber temperature. Thus it is possible to reduce the temperature dropping speed and power and to reduce the temperature ripple.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a temperature control method and apparatus for a cooking appliance such as a toaster oven that is provided with a heater in its heating chamber.

[Prior Art] For example, it has been known to control the temperature in the west side of the heating chamber of a toaster oven to a desired temperature using a microcomputer, and an example thereof is shown in FIG.

fPJlB The power supply indicated by 101 in the diagram includes a timer 102.
A series circuit including a relay switch 103, and a heater 104 is connected. Further, a control section 105 consisting of a microcomputer is connected to the power supply 101. A temperature sensor 106 for detecting the temperature inside the heating chamber is connected to the human power port of the control section 105, and a relay 107 is connected to the output port of the control section 105. A relay 107 opens and closes the relay switch 103.

In such a conventional configuration, the temperature sensor 1
When the temperature inside the heating chamber detected at step 06 is lower than the set temperature, the control unit 105 energizes the relay 107, so the relay switch 103 is closed and the heater 104 is energized at a 100% energization rate. Ru. When the temperature inside the heating chamber becomes lower than the set temperature, the control unit 105 cuts off the power to the relay 104, so the relay switch 103 is opened and the current flow rate to the heater 105 is reduced to 0%.
shall be.

[Three problems to be solved by the invention] Conventionally, as described above, temperature is controlled by energizing at a 100% energization rate below a set temperature and 0% at a temperature above the set temperature. ;A The temperature decreases quickly after the electricity is interrupted, and the temperature increases quickly after the electricity is restarted. Therefore, the temperature characteristic of the heating chamber becomes as shown by the dotted line in FIG. 2, and the set temperature T of this characteristic curve is crossed many times.

In other words, since the relay switch 103 opens and closes frequently, there is a problem that its contact life is short. On top of that,
As described above, the rapid rate of decrease and increase in temperature means that the rate of decrease and increase is also large, and therefore there is a problem in that the ripple in temperature with respect to the set temperature T is large, as shown in the above characteristic curve.

An object of the present invention is to obtain a temperature control method for a cooker that can reduce temperature ripples. A further object of the present invention is to provide a temperature control device for a cooker that can reduce temperature ripples and improve the life of the contacts of a relay that controls energization to a heater.

[Means for Solving the Problems] In order to achieve the above object, the temperature control method for a cooking appliance of the present invention includes controlling a heater provided in a heating chamber by an energization control means to adjust the temperature. When the temperature in the heating chamber is higher than the control target temperature, the energization rate is lower than 100% energization rate and does not cause a temperature rise in the heating chamber. It is designed to energize the heater.

Further, in order to achieve the above object, the temperature control device for a cooking device of the present invention includes a temperature setting device for specifying a cooking temperature, a temperature sensor for detecting the temperature inside a heating chamber in which a heater is provided, and the temperature setting device for the above-mentioned temperature setting device. a target temperature setting means for reading and setting a control target temperature T1 read in advance corresponding to a cooking temperature designated by the cooking device; and a target temperature setting means for reading and setting a control target temperature T1 read in advance corresponding to a cooking temperature specified in the cooking device, and reading a temperature T3 in the heating chamber detected by the temperature sensor at predetermined intervals. Temperature detection control means to be set with and upper iC! l! a comparison means for comparing the target temperature T and the temperature T3; a relay for controlling the energization time and non-energization time for the heater; The relay controls the energization to the heater at a first energization rate of 100% or less, and the comparison result is T, ≧T1.
and energization rate setting means for setting the energization rate to the heater by the relay to a second energization rate smaller than the first energization rate.

[Function] According to the temperature control method of the present invention, when the temperature inside the heating chamber is higher than the control target temperature, the energization rate to the heater is reduced to 0.
%, it is ensured that the heater is energized at a small energization rate that does not cause a rise in the temperature of the heating chamber.

Therefore, the speed and force of temperature rise after interruption of current supply can be reduced.

Further, in the temperature control device of the present invention, when the temperature setting device specifies a cooking temperature corresponding to the food to be cooked, the target temperature setting means reads out the control target temperature T corresponding to the cooking temperature, and compares it with the comparison means. Set to . The temperature T within the heating chamber detected by the temperature sensor is read at predetermined time intervals by the temperature detection control means and set in the comparison means. These respective temperatures T, T3 are compared by the comparison means, and based on the comparison result, the energization rate setting means controls the energization control means to adjust the energization time to the heater and the non-energization time.
control the time between That is, when the comparison result is T,>'r, the heater is energized at the first energization rate of 100% or less. This energization allows the temperature in the heating chamber to rise at a slower speed and force than when the heater is energized at 100% energization rate. Also, the comparison result is T
, a'r, the heater is energized at a second energization rate that is smaller than the first energization rate and does not cause a temperature rise in the heating chamber. This energization makes it possible to reduce the speed and force of the temperature drop in the heating chamber.

[! Stream Side] An embodiment of the present invention will now be described with reference to FIGS. 1 to 12.

Referring to FIG. 11, there is shown a case forming the outer shell of the toaster oven, and an opening/closing door 3 is attached to the front panel 2 of this case 1 so as to be movable together. A heating chamber 4 with a front opening that can be opened and closed by an opening/closing door 3 is formed in the case 1 (c).
Heaters 6 are provided above and below, respectively. These upper and lower heaters 6 are connected in parallel or in series. This heater 6 is connected to a commercial AC power source 7 (
(see Figure 3). A temperature sensor 61 (see FIGS. 1 and 3) made of an h-characteristic thermistor is installed inside the case 1 to directly or indirectly detect the temperature inside the heating chamber 4.

Inside the case 1, there is a timer storage chamber 8 separated from the heating chamber 4.
(See FIG. 5) is formed, and this storage chamber 8 is provided with a timer 9 for setting the energization time to the heater 6. This timer 9, as shown in FIGS. 5 and 6, frames 10 f-i L. frame 10
A bracket 11 is attached to the front surface 10a of the front panel 2, and this bracket 11 is screwed to the surface of the front panel 2.

An operating shaft 12 is rotatably supported on the upper part of the frame 10. The front end of the operating shaft 12 passes through the front panel 2,
A timer knob 40 is attached to the penetrating end.

The operating shaft 12 is artificially rotated together with the timer knob 40 in the timer winding direction and rewinding direction.

When the operating shaft 12 is rotated in the timer winding direction, a mainspring (not shown) is wound up in conjunction with this, and the restoring force of this mainspring causes the operation shaft 12 to be turned in the timer winding direction (see Fig. 10). (in the direction of arrow A).

As shown in FIG. 5, a large gear 13 is attached to the operating shaft 12 and rotates integrally therewith. The large gear 13 meshes with a small gear 14 that is pivotally supported on the frame 10.
An escape wheel 15 is coaxially fixed to one end surface of 4. A balance wheel 16 is arranged below the escape wheel 15. The balance 16 is rotatably supported on the frame 10 via a pivot 17 (see FIGS. 10 and 11). A pair of engaging pawls 19a and 19b are provided which are releasably engaged at two locations spaced apart from each other.

A solenoid 21 for rotating the balance wheel 16 is attached to a lower rear portion 11ob of the frame 10 via a bracket 20. The solenoid 21 is connected to a stabilized power supply 23 (see FIG. 3) for the solenoid relay that converts alternating current from the commercial AC power supply 7 into direct current, and is excited by this power supply 23 to magnetize the iron core 24. It has become.

One end of a magnetic metal plate 25 is swingably connected to the bracket 20 so as to face the iron core 24 at a distance.

The other end of the magnetic metal plate 25 is connected to the through hole 2 provided in the frame 10.
6 and extends toward the balance wheel 16 side, and a locking portion 27 provided at the other end thereof is hooked on a locking arm portion 31 of the balance wheel 16. The magnetic metal plate 25 is the tension spring 2
8, it is urged in a direction away from the iron core 24. Due to this bias, the locking portion 27 of the magnetic metal plate 25 is pushed up, and the balance wheel 16 moves in the opposite direction, as shown by arrow B in FIG. It is designed to be rotated one clockwise direction. For this reason, the engaging pawl portion 19a of the balance wheel 16.

Among 19b, one engaging pawl 19a located on the rear side in the rotational direction of the escape wheel 15 engages the teeth 18 and prevents the escape wheel 15 from rotating due to the return force of a mainspring (not shown).
I'm L.

When the magnetic metal plate 25 is attracted to the iron core 24, the locking portion 27 of the magnetic metal plate 25 is pulled down as shown in FIG. Rotated in the rotational direction.

Then, one of the latching claws 1 that was latching on the escape wheel 15
9a leaves the escape wheel and di15, and this escape wheel 1
5 is released, but on the contrary, the other latching claw part 19
b enters between the teeth 18 of the escape wheel 15. Therefore, when the escape wheel 15 rotates by a certain angle due to the release of the rotation restriction, the latching claw portion 19b engages with the other tooth portion 18, and the rotation of the escape wheel 15 is prevented again. It has become.

That is, the escape wheel 15 rotates by one pitch of the mountain portion 18 each time the balance wheel 16 rotates once.
Since this rotation is transmitted to the operating shaft 12 via the small gear 14 and the large gear 13, the operating shaft 12 is intermittently rotated in response to the excitation of the solenoid 21. Large gear 13, small gear 14, escape wheel 15, balance wheel 16, magnetic metal plate 25,
The solenoid 21 constitutes a driving means 29 that drives the operating shaft 21.

On the front panel 2 of the case 1, there is a scale 30 located around the timer knob 40 that displays the cooking time in 1 minute increments up to 30 minutes. By matching 40a, the cooking time is set.

As shown in FIG. 5, a first plate cam 47 and a second plate cam 48 are fixed to the operating shaft 12.

At positions facing the cam surfaces 47a and 48a of these plate cams 47 and 48, there is a timer switch, that is, a controller 41. which will be described later. Four Kyoto-type enlargement switches and a normal switch 50 are provided for switching the timer drive mode. These switches 4950 include a cam surface 47a,
48a, and when the operating shaft 12 is rotated in the winding direction via the timer knob 40, the cam followers 49a, 50a are rotated according to the shape of the cam surface 478% 48a. It is pushed up so that each switch 49,50 can be closed individually.

That is, when the indicator protrusion 40a of the timer knob 40 is in the off position, both switches 49 and 50 are open. The enlargement switch 49 is closed when the indicator protrusion 40a is set to i) for a short period of time from 1 minute to 15 minutes. Further, the normal switch 50 is configured to close when the indicator protrusion 40a is set for a long period of time, such as from 15 minutes to 30 minutes. These switches 49 and 50 control the rotation angle of the operating shaft 12, that is, the center
The adjusted cooking time is detected, and the controller 41 (described later)
The timer drive mode control means 43 of the solenoid 21
The device is configured to switch to either a first timer drive mode in which operating pulses are sent out at 30 second intervals or a second timer drive mode in which operating pulses are sent out at one minute intervals.

When the cooking time is set to a short time period using such a drive mode, the driving speed of the driving means 29 is doubled compared to when the cooking time is set to a long time period.
As shown in FIG. 9, the interval L1 between the scales 30 indicating the short time period is expanded to twice the interval L2 between the scales 30 indicating the long time period.

The solenoid 21 of the timer 9 is controlled by four controllers each consisting of a microcomputer. As shown in FIG. 3, this controller 41 includes a timer means 42, a timer drive mode control means 43,
It has at least a temperature control means 44 and a temperature display control means 45.

This controller 41 is a microcomputer electric current that converts the alternating current from the commercial alternating current power supply 7 into direct current and adjusts the voltage appropriately. fi, 36. The input port of the controller 41 is connected to the temperature sensor 61, the switches 49, 50, the oscillation circuit 62, and the switches 52, 56, 72, 73, 57, which will be described later, and the output port is connected to the controller 41. , the already mentioned solenoid 21,
A relay 46, a buzzer 38, and a display 74, which will be described later, are connected respectively.

The cooking time is set in the timer means 42 via the timer 9, and the 117 minutes set therein are measured by counting the number of pulses given by the oscillation circuit 62 with a counter. It has become.

For example, when the timer knob 40 is set to a short time period of 15 minutes from the OFF state, the timer drive mode control sub-means 43 controls the timer drive mode once every 30 seconds.
When 0 is set to 2 for a long period of time from 15 to 30 minutes, each of the two solenoid drive modes in which operating pulses are sent to the solenoid 21 at a rate of once per minute is
It is pre-programmed and set. Therefore, in this control means 43, when the timer knob 40 is set to a short time period, the energization interval to the solenoid 21, that is, the non-energization interval from one energization time to the next energization time, becomes 30 seconds, which conversely increases the longevity of the solenoid 21. According to the rental period, the de-energization interval is one minute, and the energization of the solenoid 21 is controlled in these two solenoid drive modes.

Relay 4 connected to output port of controller I/roller 41
6 is a normally open open/close switch 46a as a relay contact.
The opening/closing switch 46a is connected in series with the energizing circuit for the heater 6. This relay 46 is used as an energization control means, and the open/close switch 46a thereof is controlled by the temperature control means 44 to control the energization rate for the heater 6, that is, the energization in the case of a row of tree nuts. 11 periods and non-energizing time are controlled.

A printed wiring board 71 is attached to the back side of the front panel 2, as shown in FIG. Temperature setting switches 72 and 73 as temperature setting devices are attached to this substrate 71, and displays 74 are attached to each of them, and each of these is exposed on the surface of the front panel 2.

In the case of this embodiment, the temperature setting switches 72 and 73 are comprised of automatic reset type push-button switches, and the cooking temperature can be specified in 10°C increments by a single suppression operation. One temperature setting switch 72 is for decreasing the temperature, and the other temperature setting switch 73 is for increasing the temperature.

These switches 72 and 73 allow the temperature inside the heating chamber 4 to be specified within the range of 100°C to 250°C.

The display 74 consists of a liquid crystal display or the like, on which the cooking temperature specified by the temperature setting switches 72 and 73 is displayed via the temperature display control means 45.

Further, on the back side of the front panel 2, as shown in FIG. 8, a printed wiring board 51 for supporting the controller 41 and other electrical components is attached. A push-button toast switch 52 exclusively used for baking bread is attached to the board 51 so as to be operable from the front side of the front panel 2. When this switch 52 is operated, the controller 41 heats the bread for a toast cooking time that is automatically set according to a program set for bread baking. Therefore, in this case, there is no need to operate the timer knob 40.

Further, on the board 51, there is a push-button cancel switch 56 for canceling bread baking by the toast switch 52, and a slide switch 57 for browning and IEE.
are respectively attached so as to be operable from the front side of the front panel 2. Further, a buzzer 38 shown in FIG. 3 is used to notify the completion of cooking.

Details of the temperature control means 44 are shown in FIG.
This will be explained below. This means 44 includes a temperature setting section 81 as a degree setting means, an A/D conversion section 82, a detection control section 83 as a temperature detection control means, and first to third comparison means as a comparison means. 84 to 86, first to third energization rate setting units 87 to 89 as energization rate setting means, and a ROM (not shown).

The temperature setting switch 72 is connected to the input terminal of the temperature setting section 81.
．． 73 is connected, and the first
~Third comparison units 84 to 86 are connected, respectively. This setting section 81 reads out a first control target temperature T1 and a second control target temperature T2 corresponding to the cooking temperature specified by the switch 72, 73 from the ROM, and each comparison section 84
to 86, respectively.

The first control target temperature T1 is higher than the second control target temperature T2. Each control target temperature T1T2 is obtained through experiment and stored in the ROM in advance. Moreover, each control target temperature T, , T2 is uniquely determined for an arbitrarily designated cooking temperature (set temperature), and these temperatures T, , T2 are determined to be below the designated cooking temperature. It is being

The temperature sensor 61 is connected to the input end of the A/D conversion section 82, and the detection control section 83 is connected to the output end. The A/D converter 82 outputs the detection output of the temperature sensor 61 (
That is, the temperature Tq) inside the heating chamber 4 is digitized. The detection control unit 83 reads the temperature T1 at predetermined intervals, for example, every 30 seconds. Comparison units 84 to 86 are connected to the output terminal of this detection control unit 83, respectively, so that the temperature T is inputted to each comparison unit 84 to 86 every 30 seconds by the detection control unit 83. It looks like this.

The comparison sections 84 to 86 compare the respective temperatures T1 to T3. In other words, the first comparator 84 detects the temperature T2. Compares whether T satisfies T2>T3, and compares it with the 2nd comparison unit 85.
compares whether the temperatures T1 to T satisfy the relationship T,>T3≧T2, and the third comparator 86 compares whether the temperatures T1 to T satisfy the relationship T
This is a comparison to determine whether the relationship 3≧T1 is satisfied. First to third energization rate setting sections 87 to 8 are connected to the output ends of these comparison sections 84 to 86, respectively.

Each of the setting sections 87 to 89 is provided to select the energization rate to the heater 6 according to the comparison result. The first energization rate setting unit 87 controls the relay 46 so that the energization rate is 100% at 0 and 7, where the comparison result of T2>T is taken, that is, continuous energization is performed without any non-energization period. It is something to do. The second energization rate step setting section 88 is configured such that T1>'r
, the energization period and non-energization period of the relay 46 are controlled so that the energization rate is less than 100%, for example, 60%, when the comparison result of T2 is obtained. The temperature of the heating chamber 4 is raised or lowered by the heat generated by the heater 6 at this first energization rate. The third energization rate setting section 89 is
The relay 46 is set so that when the comparison result of T3 z'r is obtained, the energization rate is 60% or less, for example, 10%.
The energization period and the non-energization period are controlled. The temperature of the heating chamber 4 is lowered by the heat generated by the heater 6 at this second energization rate.

Next, the operation of this embodiment will be explained with reference to FIG.

When the plug 1a is connected to an outlet, the power is turned on and the controller 41 executes step 1 to determine whether the temperature setting switch 72, 73 has been operated. If this determination is No, the controller 41 proceeds to step 17 and determines whether the toast switch 52 has been operated, and if the determination is No, the controller 41 returns to step 1.

If the determination in step 1 is YES (established), the controller 41 causes the display 74 to display the cooking temperature specified by the switch 72 or 73 via the temperature display control means 45. The display at this time blinks. In the next step 3, the temperature setting unit 81 reads out the control target temperatures T, , T2 corresponding to the designated cooking temperature from the ROM,
This is set in the first to third comparison units 84 to 86, respectively.

Next, the controller 41 executes step 4 to adjust the temperature T of the heating chamber 4 detected by the temperature sensor 61 to A.
/D conversion, and the detection control unit 83 takes in the temperature T once every 30 seconds, and then outputs the temperature T to the first to third comparison units 84 to 86.
be set respectively.

After this, the controller 41 executes step 5 and determines whether the timer 9 has been operated.

If this determination is No, step 17 described above is executed.

Timer 9 is set to t'f, step 5, 1', 11.
When the disconnection becomes Y[ES, the temperature control means 44 of the controller 41 operates the first comparison section 84 to
Temperature T2. The relationship of Tq is T2 > 7. Step 6 is executed to compare whether or not.

If the determination in step 6 is YES, step 7 is executed in which the first energization setting section 87 of the temperature control means 44 operates the relay 46. By executing this, the relay 46 is continuously energized, so the on/off switch 4
6a remains closed. Therefore, the heater 6 is energized with a 100% energization rate. Further, if the determination in step 6 is NO, the process proceeds to step 12, which will be described later.

Next, the controller 41 operates the temperature display control means 45 to stop the blinking operation of the display 74, and at the same time causes the display 74 to continuously light up to continuously display the already set cooking temperature (step 8). Execute. Thereafter, step 9 is executed to operate the solenoid 21 via the timer drive mode control means 43.

Then, the solenoid 21 is intermittently excited in response to the operating pulse, and intermittently attracts the magnetic metal plate 25 to rotate the balance wheel 16. Therefore, each time the balance wheel 16 rotates, the escape wheel 15 rotates by one pitch of the teeth 18 due to the restoring force of the mainspring, and the operating shaft 12 is gradually rewound.

Then, proceeding to step 10, the temperature control means 44 of the controller 41 operates the second comparison section 85,
The relationship between the above temperatures T1 to T is T.

A comparison is made to see if >T3≧T2. If the determination in step 10 is YES, step 11 is executed in which the second energization setting section 88 of the temperature control means 44 operates the relay 46.

By this execution, the energization and de-energization of the relay 46 are controlled, so that the open/close switch 46a is opened and closed.

Therefore, the heater 6 is energized with an energization rate of 0006. This energization rate is determined by the detection control unit 83, and the temperature T3 of the heating chamber 4 is detected by the comparators 84 to 86 every 30 seconds.
Therefore, it is checked every 30 seconds, and therefore, the control mode within these 30 seconds is 18 seconds of energization and 122 seconds of no power. Also, the judgment at step 10 is N.

If so, return to step 6.

When step 11 is finished, the controller 41 executes step 12. In step 12, the temperature control means 44 operates its third comparison section 86 to compare whether the relationship between the temperatures T, , T, and T is TqaT+. If the decision in step 12 is YES,
The relay 4 is controlled by the eight third energization setting sections of the temperature control means 44.
Step 13 of operating 6 is executed.

By this execution, energization and de-energization of the relay 46 is controlled, so that the open/close switch 46a is opened and closed. Therefore, the heater 6 is energized with a 10% energization rate. This energization rate is also set to 3 by the detection control unit 83.
Since the temperature T of the heating chamber 4 is replaced every 0 seconds with respect to the comparators 84 to 86, it is checked every 30 seconds.
Therefore, the control mode within this 30 seconds is energization for 27 seconds,
Power is off for 3 seconds. Also, the determination at step 12 is N.

If so, return to step 6.

Next, the controller 41 executes step 14,
↑ Check whether the cooking time set on timer 9 has elapsed.
11, and if the result is No, return to step 6. If the determination in step 14 is YES, the controller 41 executes step 15 to reset the timer 9, and then executes step 16.

In this step 16, the relay 46 is turned off and the open/close switch 46a is opened, so the power supply to the heater 6 is stopped.
When the cooking is completed, the buzzer 3 will sound to indicate the completion.
8 to notify the user, and the display 74 is turned off via the temperature display control means 45.

With this, the cooking operation is completed.

As described above, in this toaster oven, the heater 6 is energized at a 100% energization rate until the temperature T1 of the heating chamber 4 reaches the second control target temperature T2, and the temperature of the heating chamber 4 is quickly raised. be able to.

The temperature T of the heating chamber 4 is checked every 30 seconds, and when the temperature T3 reaches the second control target temperature T2, the energization rate BO
Since the heater 6 is energized at a rate of 100%, the speed and force of temperature increase in the heating chamber 4 can be made smaller than when the energization rate is 100%.

When the temperature T in the heating chamber 4 reaches the first control target temperature T, the heater 6 is energized at a energization rate of 10%, so the temperature in the heating chamber 4 reaches a peak due to thermal inertia. After reaching this temperature, the temperature gradually decreases. However, since the heating is performed at the energization rate of 10% as described above, the rate of temperature drop in the heating chamber 4 is considerably small, and its momentum (thermal inertia) is also small.

Therefore, due to the temperature drop, the first control target temperature T1
The extent to which it falls below due to thermal inertia also becomes smaller.

Then, since the heater 6 is energized again at the energization rate of 60%, the R speed and its force due to the temperature of the heating chamber 4 can be made smaller than when the energization rate is 100% as described above.

The above control operations are repeated for the time set in the timer 9.

That is, according to the temperature control as described above, the characteristics shown by the solid line in FIG. 2 can be restored.

The heating chamber 4 fluctuates around the first control temperature T1.
As mentioned above, the temperature of the mountain has small thermal inertia. By doing so, the temperature ripple is small, so highly accurate temperature control can be achieved.

In addition, since both the rate of temperature decrease and the rate of temperature increase are small as described above, the number of times this temperature characteristic curve crosses the first control target temperature T1 is small. The number of times that the switch 46a opens and closes is small, and the life of the contacts of the switch 46a can be improved.

Further, if the determination in step 17 is YES, that is, if it is determined that the toast switch 52 has been suppressed, the process proceeds to step 18, and the browning adjustment switch 57
It is determined whether or not the has been operated.

If the judgment is YES, proceed to step 1 and set the toast time B according to the adjustment content by operating the browning adjustment switch 57, and if the judgment is No, the regular toast time B, (This time is adjusted above ■, 1
(shorter than 1 hour).

When such settings are completed, the controller 41 proceeds to step 21 and operates the solenoid 21 via the timer drive mode control means 43.

In the next step 22, the first energization setting section 87 of the temperature control means 44 operates the relay 46.

By executing step 22, the relay 46 is continuously energized, so that the relay contact 46a remains closed, and therefore the heater 6 is 100% energized.
Continuous energization is performed with a energization rate of .

Thereafter, the controller 41 proceeds to step 23 and causes the temperature display control means 45 to change the display on the display 74 to indicate grilled toast. This display may be shown on the display, for example.
This is executed by displaying the characters AJ.

Then, in the next step 24, the controller 41 determines whether or not the timer time B, has elapsed, and then
+If the answer is No, the process returns to step 21. Further, if the determination in step 24 is YES, the controller 41 executes step 25 to reset the timer 9, and then executes step 26.

In this step 26, the relay 46 is turned off and the open/close switch 46a is opened, so that the power supply to the heater 6 is stopped and cooking is completed.The completion is notified by sounding the buzzer 38 and the temperature is displayed. The display 74 is turned off via the control means 45.

This completes the automatic toast baking operation.

Although the above-mentioned large embodiment has a groove bottom as described above, in the present invention, the comparison section 85 and the second energization rate setting section 88 for the second control port mxT2 are omitted, and the temperature is set as follows. When increasing the voltage, it may be done at a 100% energization rate. Furthermore, in the method of the present invention, a semiconductor energization control element such as a thyristor may be used instead of a relay as the energization control means.

It goes without saying that the present invention is not limited to toaster ovens, but can also be applied to ovens, ranges with heaters, and the like.

[Effects of the Invention] As described above, according to the method for controlling the temperature of a cooking device according to claim 1, when the temperature in the heating chamber is higher than the control target, Since the heater is energized at a energization rate that is smaller than the 100% energization rate and does not cause a rise in the temperature of the heating chamber, the speed and force at which the temperature decreases can be controlled. small (and the temperature ripple can be reduced).

Further, according to the temperature control device for a cooker according to claim 2, the device includes a temperature sensor, a target temperature setting means, a temperature detection control means, a comparison means, a relay, and an energization rate control means, The control target temperature T1 is set in the comparison means in correspondence with the cooking temperature specified by the temperature setting device, and ? The relationship with the temperature inside the heating chamber, T, detected by the HK sensor is T,>7.
．． When , the heater is energized at a first energization rate of 100% or less, and when T3≧T1, a second energization rate that is smaller than the first energization rate and does not cause a temperature rise in the heating chamber is applied. Since the configuration is such that power is supplied to the heater at There is also a relay that makes up.

can improve the life of the contacts.

[Brief explanation of the drawing]

Figures 1 to 12 show an embodiment of the present invention, Figure 1 is a block diagram showing the configuration of the temperature control means, and Figure 2 compares the temperature characteristics of the heating chamber of the present invention and a conventional example. Figure 3 is a block diagram showing the overall configuration of the temperature control device, Figure 4 is a block diagram showing the overall configuration of the temperature control device.
Figure 5 is a flowchart showing the control procedure, Figure 5 is a sectional view of the timer, Figure 6 is a view taken from the direction of ■ in Figure 5, Figure 7 is a front view of the operation panel of the toaster oven, and Figure 8 is a front view of the operation panel of the toaster oven.
The figure is a sectional view along the line ψ■-■ in Figure 7, Figure 9 is a front view showing the relationship between the timer knob and the scale, and Figures 10 and 11.
The figures are operation explanatory diagrams showing the lateral operation of the drive tii, respectively.
The figure is a perspective view of the entire toaster oven. FIG. 13 is an electric circuit diagram showing a conventional temperature control device for a toaster oven. 4... Heating chamber, 6... Heater, 41... Controller, 44... Temperature control means, 46... Relay (energization control means), 46a... Relay switch, 61...
-Temperature sensor, 72.73... Temperature setting switch (temperature setting TI), 81... a degree setting section (target temperature setting means), 83... Detection control section (temperature detection control means), 8
5°86... Comparison section (comparison means), 88.89...
Energization rate setting section (energization rate setting means). Participating Agent Patent Attorney Takehiko Suzue Figure 5 Figure 8 Figure 8 ] 1 4 Heating Room Figure 13 Procedural Amendment Form Hei Oren 12d1

Claims (2)

[Claims] (1) In a device in which temperature is adjusted by controlling a heater provided in a heating chamber by an energization control means, when the temperature in the heating chamber is higher than the control target temperature, the adjustment is performed when energizing the heater starts. A temperature control method for a cooking appliance, characterized in that the heater is energized at an energization rate that is smaller than 100% and does not cause a temperature rise in the heating chamber. (2) A temperature setting device that specifies the cooking temperature, a temperature sensor that detects the temperature in the heating chamber in which the heater is installed, and a control target that is predetermined corresponding to the cooking temperature specified by the temperature setting device. a target temperature setting means for reading and setting the temperature T_1; and a temperature T in the heating chamber detected by the temperature sensor.
temperature detection control means for reading and setting the temperature T_3 at predetermined time intervals; a comparison means for comparing the control target temperature T_1 and the temperature T_3; a relay for controlling the energization time and non-energization time for the heater; When the comparison result by the comparison means is T_1>T_3, the relay controls the energization to the heater at a first energization rate of 100% or less, and when the comparison result is T_3≧
A temperature control device for a cooking appliance, comprising: an energization rate setting means for setting the energization rate of the relay to the heater at a second energization rate smaller than the first energization rate at time T_1.