JP2000116525A - Bread baking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bread of a fixed baking color even if a temperature dissociation of a bread baking mold is large by deciding the energizing rate to a heating means according to the temperature difference between a detection temperature from start of the baking process to a time elapsing a prescribed time and a detection time from the start of the baking process to a time elapsing another prescribed time. SOLUTION: In entering into a baking process, a control means 14 starts the timing of a elapsed time by a timing means 15 and continuously energizes to a heater 2. After elapsing of a prescribed time, the temperature of a baking chamber 1 is detected by a temperature detecting means 7. After elapsing another prescribed time, the temperature is detected by the temperature detecting means 7 and at the same time the temperature difference between the both detecting temperature is calculated. When the detecting temperature reaches a prescribed temperature and if it is more than a prescribed temperature difference and less than another temperature difference, the control means 14 energized and controls the heater 2 so as to hold the temperature of the bread baking mold 3 at a fixed temperature. That is to say, the energizing rate to the heater 2 is controlled to increase/decrease according to the temperature difference and the energization to the heater 2 is continued till the baking process reaches a prescribed time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bread baker used in ordinary households.

[0002]

2. Description of the Related Art A conventional bread baking machine will be described with reference to FIGS. FIG. 8 is a block diagram showing the configuration of the main part of a conventional bread baking machine. 1 is a baking chamber, 2 is a heater constituting a heating means, 3 is a bread baking mold detachably mounted, 4 is a motor, 5 is a motor. A belt for transmitting the power of 4, a mixing blade 6 driven by the motor 4,
Reference numeral 7 denotes a temperature detecting means which comes into contact with the outer surface of the baking chamber 1 and detects the temperature of the baking mold 3 for process determination and temperature control.
Is a lid, 9 is a yeast input port for inputting yeast, 10 is a solenoid for dropping yeast in conjunction with a valve of the yeast input port 9, 11 is a heater 2, a motor 4, and a solenoid 10 based on a signal from the temperature detecting means 7. Control means equipped with a microcomputer for controlling and baking,
Reference numeral 12 denotes a display unit for displaying an operation state and time, and 13 denotes an operation unit for instructing a menu, a course, and a start of cooking. When cooking is started by operating the operation unit 13, the control unit 11 selects one of the plurality of baking processes based on the temperature detected by the temperature detection unit 7, and then selects the heater 2, according to the selected baking process. The respective loads of the motor 4 and the solenoid 10 are controlled to perform baking.

FIG. 9 is a diagram showing an example of the detected temperature of the temperature detecting means 7 and the ratio of energization to the heater 2 during the baking step of a conventional bread baking machine. When the firing step is started, the control means 11 continuously energizes the heater 2. When the temperature in the sintering chamber 1 rises and the temperature reaches 100 ° C. by the output of the temperature detecting means 7, the control means 11 reduces the energizing ratio to the heater 2 to 85.
%. Thereafter, when the temperature reaches 150 ° C., the control means 1
Reference numeral 1 indicates that the proportion of electricity to the heater 2 is 30%. Thereafter, when the detected temperature is equal to or higher than 130 ° C., the feedback control of the temperature is performed at an energizing ratio of 30% when the detected temperature is 130 ° C. or higher, and when the detected temperature is lower than 130 ° C., the energizing ratio is 65%. After 50 minutes from the start), the cooking was finished.

[0004]

In such a conventional bread baking machine, the temperature detecting means is mounted in contact with the outer surface of the baking chamber, and the temperature of the baking mold is not accurately detected. Due to the overshoot of the feedback control, a temperature deviation between the baking mold and the temperature detecting means has occurred. Therefore, due to fluctuations in the power supply voltage and variations in the heater, the temperature of the bread baking mold changes significantly even though the temperature detection means controls the temperature at a constant temperature, making it difficult to keep the bread baking color constant. was there.

An object of the present invention is to solve the above-mentioned conventional problems, and it is an object of the present invention to make it possible to produce bread of a fixed baking color even when the temperature difference between the temperature detecting means and the baking mold is large. Things.

[0006]

Means for Solving the Problems To achieve the above object, one means of the present invention is to provide a firing chamber having a heater,
A baking mold that can be removably mounted in the baking chamber, a temperature detection unit that detects a temperature in the baking chamber, and a control unit that controls the heater and the motor by an output of the temperature detection unit. The control means determines an energization ratio to the heating means based on a temperature difference between a detected temperature after a first predetermined time has elapsed from the start of the firing step and a detected temperature after a second predetermined time has elapsed from the start of the firing step. It is something to do.

[0007] With the above configuration, it is possible to optimally control the power supply to the heating means at the time of baking, and to obtain a bread of a constant baking color.

[0008]

The invention according to claim 1 comprises a baking chamber having a heater, a baking mold removably mounted in the baking chamber, temperature detecting means for detecting a temperature in the baking chamber, and Control means for controlling the heater and the motor in accordance with the output of the temperature detection means, wherein the control means detects a temperature after a first predetermined time has elapsed from the start of the firing step, and a control means for detecting a second temperature from the start of the firing step. The bread ratio is determined by the temperature difference from the detected temperature after a predetermined time elapses, and the ratio of current to the heating means is determined. Even if the voltage fluctuates, the energization ratio can be determined so as to keep the temperature of the baking mold constant regardless of the temperature of the temperature detection means from the time required for the temperature rise, so that the baking color is constant. It can be kept.

Further, the invention according to claim 2 is characterized in that the temperature difference between the detected temperature after the lapse of the first predetermined time from the start of the firing step and the detected temperature after the lapse of the second predetermined time is determined by the second predetermined temperature. From the period of time until the first predetermined temperature is reached,
And determining the energization ratio after the temperature reaches the first predetermined temperature. The bread baker according to claim 1, wherein the peak temperature is reached from the end of the time measurement by the time measured. Since the energization ratio up to the above is corrected, the temperature rise in the firing chamber can be suppressed, and the firing color can be kept constant.

According to a third aspect of the present invention, the control means calculates the temperature difference between the detected temperature after the first predetermined time has elapsed and the detected temperature after the second predetermined time has elapsed since the start of the firing step. A bread baker according to claim 1, wherein the first predetermined temperature is determined. With this configuration, the peak temperature is corrected by the time measured, so that the baked color can be kept constant. it can.

According to a fourth aspect of the present invention, the control means determines the second predetermined time based on a difference between the detected temperature after the first predetermined time has elapsed and the temperature after the second predetermined time has elapsed from the start of the firing step. And determining the time until the energization ratio is changed after the elapse of the time. 2. The configuration according to claim 1, wherein the continuous energization time is corrected by the measured time. Therefore, the burning color can be kept constant.

Further, the invention according to claim 5 is provided with a baking color selection means for selecting a baking color of bread, and the control means uses a baking color selected by the baking color selection means to set the baking color from a second predetermined temperature or lower. 4. The bread baker according to any one of claims 1 to 3, wherein the ratio of energization to the heating means is determined. Since the difference between the temperature detected by the detection means and the temperature of the bread baking mold can be reduced, the desired baking color can be kept constant.

Further, the invention according to claim 6 is provided with a capacity selecting means for selecting the capacity of the bread, and the control means uses the capacity selected by the capacity selecting means to the heating means after the second predetermined temperature. 4. The bread baker according to any one of claims 1 to 3, wherein the power supply ratio of the bread is determined, and even if the bread capacity is small, the heater power varies according to the bread capacity. And fluctuations in power supply voltage can be absorbed, and the burning color can be kept constant.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a main part of a first embodiment of the present invention, in which the same components as those in the prior art are denoted by the same reference numerals. 14 is a temperature detecting means 7
And control means for controlling the heater 2, the motor 4 and the solenoid 10 in accordance with a signal from the time measuring means 15 to perform baking, 15 means for measuring the time elapsed since the start of the heating step, and 16 means for selecting the baking color. A menu, a course, a baked color, a size, and the like are set by an operation unit including a storage unit 17 and a capacity selection unit 18 and cooking is instructed. When the start of cooking is instructed by the operation unit 16, the control unit 14 controls a heater, a motor, and a solenoid to realize a predetermined baking process while inputting the temperature detected by the temperature detection unit 7. Here, the control means 14 and the timing means 15
Is included in one one-chip microcomputer.
Further, the display section is constituted by a liquid crystal display element.

FIG. 2 is a graph showing the relationship between the elapsed time from the start of baking and the temperature detected by the temperature detecting means during the baking step in the bread making process (the horizontal axis indicates the elapsed time t from the start of baking, and the vertical axis indicates FIG. 3 is a diagram showing the temperature θ) on the axis and the energization ratio to the heater 2 at that time.

When the process proceeds to the firing step, the control means 14 starts measuring the elapsed time by the time measuring means 15 to continuously energize the heater 2. When the first predetermined time T1 (four minutes in this embodiment) elapses by the timing means 15, the temperature detection means 7
, The temperature θ1 in the firing chamber 1 is detected. Next, a second predetermined time T2 (7 in this embodiment)
Is measured by the temperature detecting means 7, and the temperature difference Δθ (= θ2−θ1) between θ1 and θ2 is obtained. The controller 14 further energizes the heater 2 continuously, and when the temperature detected by the temperature detector 7 reaches the first predetermined temperature Θ1 (155 ° C. in the present embodiment), the controller 14 sets the Δθ to the first predetermined temperature. The temperature difference ΔK1 (20 deg in this embodiment) or more and the second predetermined temperature difference ΔK2 (40 deg in this embodiment)
g), the energization ratio determined experimentally so that the temperature of the baking mold is kept constant even if it is less than 60 g (60 in the present embodiment).
%). When Δθ is less than ΔK1, the power is small due to variations in the power of the heater and the power supply voltage, and the like.
No. 4 increases the energization ratio to the heater 2 (80% in this embodiment). Further, when Δθ is equal to or larger than ΔK2, the energization ratio to the heater 2 is reduced (60% in this embodiment), and the baking process is performed for a certain period of time (50% in this embodiment).
Min), the heater 2 is energized, and then the baking process is terminated.

Thus, even if the power of the heater varies or the power supply voltage fluctuates, the burnt color of the finished bread can be kept constant.

FIG. 3 is a graph for explaining the second aspect of the present invention.
2 is a graph showing the relationship between the detected temperature and the temperature and the ratio of energization to the heater 2 at that time. As in FIG. 2, the horizontal axis represents the elapsed time t from the start of firing, and the vertical axis represents the temperature θ. ing.

When the process proceeds to the firing step, the control means 14 starts measuring the elapsed time by the time measuring means 15 to continuously energize the heater 2. When the first predetermined time T1 (four minutes in this embodiment) elapses by the timing means 15, the temperature detection means 7
Thus, the temperature θ1 in the firing chamber 1 is detected. Next, when the second predetermined time T2 (7 minutes in this embodiment) is measured by the time measuring means 15, the temperature θ2 is detected by the temperature detecting means 7.
And a temperature difference Δθ (= θ2−θ1) between θ1 and θ2 is obtained. When the time from the start of the heating step has passed the second predetermined time T2, the control means 14 determines that the temperature difference Δθ is less than the predetermined temperature difference ΔK2 (40 deg in this embodiment) (Δθ <ΔK
If 2), the heater 2 is continuously energized and the temperature difference Δθ is Δ
If K2 or more (ΔK2 ≦ Δθ), the energization ratio is reduced (80% in this embodiment). Thereafter, when the temperature detected by the temperature detecting means 7 exceeds the first predetermined temperature Θ1, the controlling means 1
Reference numeral 4 denotes the energization ratio after the first predetermined temperature Θ1 or more, which is determined in accordance with Δθ so that the temperature of the baking mold can be kept substantially constant even when the power supply voltage or the room temperature differs. The heater 2 is energized at (60% in this embodiment), and the baking process is completed for a certain period of time (50 minutes in this embodiment).

With this, the temperature in the sintering chamber 1 becomes unnecessarily high due to overshoot by feedback control in which the power supply ratio at which the temperature of the baking mold becomes constant due to variations in heater power and fluctuations in the power supply voltage is determined in advance by experiments. It can prevent the bread from rising and keep the color of the finished bread constant.

In the present embodiment, the heater 2 is continuously energized until the second predetermined time T2 elapses from the start of firing, but at a constant energization rate from the start of firing until T2 elapses. When the heater 2 is energized and the temperature difference Δθ is smaller than the predetermined temperature difference ΔK1, the energization ratio is increased until a predetermined temperature Θ1 is reached after a predetermined time T2 has elapsed from the start of heating. Is also good.

FIG. 4 is a graph for explaining the invention according to claim 3, a graph showing the relationship between the elapsed time from the start of firing in the firing step and the detected temperature detected by the temperature detecting means 7, and the heater at that time. In the figure, the horizontal axis indicates the elapsed time t from the start of firing, and the vertical axis indicates the temperature θ.

In the firing step, the control means 14 continuously energizes the heater 2. After the first predetermined time T1 (four minutes in this embodiment) has elapsed by the timer 15, the temperature θ1 in the firing chamber 1 is detected by the temperature detector 7. Next, when the second predetermined time T2 (7 minutes in this embodiment) is measured by the time measuring means 15, the temperature θ2 is detected by the temperature detecting means 7, and the temperature difference Δθ between θ1 and θ2 (= θ
2-θ1) is obtained. Thereafter, the control means 14 continuously energizes the heater 2 until the temperature reaches the first predetermined temperature Θ1 (155 ° C. in this embodiment). Θ1 is Θ1 = 1 if the temperature difference Δθ is equal to or larger than ΔK1 and smaller than ΔK2 (ΔK1 ≦ Δθ <ΔK2).
55 ° C. (no correction), and if the temperature difference Δθ is less than ΔK1 (Δθ <ΔK1), Θ1 = 160 ° C. (correction + 5
° C), and if Δθ is equal to or larger than ΔK2 (ΔK2 ≦ Δθ), Θ1 = 150 ° C (correction -5 ° C). Detection temperature is Θ
When the temperature reaches 1, the control means 14 energizes the heater 2 at an energizing ratio that maintains the temperature of the baking mold constant, and the baking process is performed at 50%.
When the minute is reached, the baking process ends.

Thus, the peak temperature can be corrected in accordance with the rise time of the detected temperature, and the burn color of the finished bread can be made constant.

FIG. 5 is a graph for explaining the invention of claim 4, a graph showing the relationship between the elapsed time from the start of firing in the firing step and the detected temperature detected by the temperature detecting means 7, and the heater at that time. In the figure, the horizontal axis indicates the elapsed time t from the start of firing, and the vertical axis indicates the temperature θ.

In the firing step, the control means 14 continuously energizes the heater 2. After the first predetermined time T1 (four minutes in this embodiment) has elapsed by the timer 15, the temperature θ1 in the firing chamber 1 is detected by the temperature detector 7. Next, when the second predetermined time T2 (7 minutes in this embodiment) is measured by the time measuring means 15, the temperature θ2 is detected by the temperature detecting means 7, and the temperature difference Δθ between θ1 and θ2 (= θ
2-θ1) is obtained. Thereafter, the control means 14 continuously energizes the heater 2 until the temperature reaches the first predetermined temperature Θ1 (155 ° C. in this embodiment). When the time from the start of the heating step elapses T2, the control means 14 determines that the temperature difference Δθ is equal to or larger than ΔK1 (20 deg in this embodiment) and ΔK2 (40 d in this embodiment).
eg) (ΔK1 ≦ Δθ <ΔK2), the continuous energization time is set to 10 minutes (standard time), and Δθ is a predetermined time Δ
If it is less than K1, the continuous energization time is 12 minutes (correction + 2 minutes)
If ΔT is equal to or longer than T2, the heater 2 is continuously energized by setting the continuous energization time to 8 minutes (correction -2 minutes). After the lapse of the continuous energization time, the control unit 14 sets the energization ratio (6 in this embodiment) that can keep the temperature of the baking mold almost constant.
(0%), the heater 2 is energized, and the baking process is completed when the firing step reaches 50 minutes.

Thus, the heating time by continuous energization can be corrected in accordance with the rise time of the detected temperature, and the color of the finished bread can be made constant.

FIG. 6 is a graph for explaining the fifth aspect of the present invention. In the firing step when the baking color is selected by the baking color selection means 17, the elapsed time from the start of baking and the temperature detection means 7 are used. A graph showing the relationship between the detected temperatures to be detected,
In this figure, the horizontal axis represents the time t elapsed from the start of firing, and the vertical axis represents the temperature θ.

In the firing step, the control means 14 continuously energizes the heater 2. After the first predetermined time T1 (four minutes in this embodiment) has elapsed by the timer 15, the temperature θ1 in the firing chamber 1 is detected by the temperature detector 7. Next, when the second predetermined time T2 (7 minutes in this embodiment) is measured by the time measuring means 15, the temperature θ2 is detected by the temperature detecting means 7, and the temperature difference Δθ between θ1 and θ2 (= θ
2-θ1) is obtained. The control means 14 is a burning color selection means 17
Is the first predetermined temperature # 1 (165 ° C. for “dark”, “medium”)
155 ° C.), heater 2 is continuously energized until it reaches
If the selected baking color is "light", the heater 2 is energized at a power-on rate of 80% until the first predetermined temperature # 1 (140 ° C for "light") is reached. After reaching # 1, current is supplied at an energizing ratio that keeps the temperature of the baking mold constant, and current is applied until the baking process reaches a certain time (50 minutes), and the baking process is completed.

This makes it possible to reduce the difference between the temperature detected by the temperature detecting means 7 and the temperature of the bread baking mold 3 even when the burning color "light" is selected, and to keep the burning color constant according to the selected burning color. Is what you can do.

FIG. 7 is a graph for explaining the invention of claim 6, wherein the temperature detecting means 7 detects the elapsed time from the start of firing and the temperature detecting means 7 in the firing step when the capacity is selected by the capacity selecting means 18. In the graph showing the relationship between the detected temperatures and the ratio of energization to the heater 2 at that time, the horizontal axis represents the time t elapsed from the start of firing, and the vertical axis represents the temperature θ.

In the firing step, the control means 14 continuously energizes the heater 2. After the first predetermined time T1 (four minutes in this embodiment) has elapsed by the timer 15, the temperature θ1 in the firing chamber 1 is detected by the temperature detector 7. Next, when the second predetermined time T2 (7 minutes in this embodiment) is measured by the time measuring means 15, the temperature θ2 is detected by the temperature detecting means 7, and the temperature difference Δθ between θ1 and θ2 (= θ
2-θ1) is obtained. When "1.5 loaf" is selected by the capacity selection means 18, the control means 14 supplies electricity to the heater 2 at a 60% conduction rate after the temperature detected by the temperature detection means 7 reaches a predetermined temperature # 1. When "1 loaf" is selected by the capacity selecting means 18, 50 is reached after $ 1 is reached.
When the time from the start of baking reaches a certain time (50 minutes), the bread making process is terminated.

Thus, the energization ratio can be corrected based on the capacity of the selected bread, and the burn color can be made constant regardless of the capacity.

[0034]

According to the first aspect of the present invention, even in the case of the main body structure in which the temperature difference between the temperature detecting means and the bread baking mold becomes large in the ordinary feedback control, the temperature rises in a certain time in the baking process. By changing the energization ratio after reaching the set temperature from the temperature difference, even if the heater power varies, the power supply voltage or the room temperature fluctuates, the burnt color of the finished bread can be kept constant.

According to the second aspect of the present invention, the variation in the heater power, the power supply voltage, and the room temperature are changed by changing the energization ratio before the peak temperature is reached from the temperature difference that rises in a certain time in the firing step. Even if it fluctuates, the baked color of the finished bread can be kept constant.

According to the third aspect of the present invention, by changing the peak temperature from the temperature difference that rises in a certain time in the firing step, even if the heater power varies, the power supply voltage, or the room temperature fluctuates, the firing chamber is changed. This makes it possible to suppress the temperature from becoming unstable and to make the baked color of the finished bread constant.

According to the fourth aspect of the present invention, the variation in the heater power, the power supply voltage, and the room temperature are varied by changing the continuous energizing time to the heater from the temperature difference that rises in a certain time in the firing step. Even in this case, the color of the finished bread can be kept constant.

According to the fifth aspect of the present invention, even when the baking color "pale" is selected, the temperature difference between the temperature detecting means and the baking mold is reduced to make the baking color of the finished bread constant. Can be done.

According to the present invention, the energization ratio after reaching the set temperature is corrected by the selected capacity,
The color of the finished bread can be kept constant.

[Brief description of the drawings]

FIG. 1 is a block diagram of a bread baker according to an embodiment of the present invention.

FIG. 2 is a diagram showing a detected temperature and a current supply ratio during a baking process of a bread baker according to one embodiment of the present invention.

FIG. 3 is a diagram showing the detected temperature and the energization ratio during the baking step of the bread baker according to one embodiment of the present invention.

FIG. 4 is a diagram showing the detected temperature and the energization ratio during the baking step of the bread baker according to one embodiment of the present invention.

FIG. 5 is a diagram showing the detected temperature and the energization ratio during the baking step of the bread baker according to one embodiment of the present invention.

FIG. 6 is a diagram showing the detected temperature and the energization ratio in the baking step of the bread baker according to one embodiment of the present invention.

FIG. 7 is a diagram showing a detected temperature and an energization ratio during a baking process of a bread baker according to one embodiment of the present invention.

FIG. 8 is a block diagram of a conventional bread baker.

FIG. 9 is a diagram showing a detected temperature and an energization ratio during a baking process of a conventional bread baking machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Baking room 2 Heater 3 Bread mold 7 Temperature detection means 14 Control means 15 Clocking means 16 Operation part 17 Burning color selection means 18 Capacity selection means

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshikatsu Maeda 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term (reference) in Matsushita Electric Industrial Co., Ltd. 4B040 AC01 AC15 AC16 AC17 AE04 CA05 LA01 LA02 LA12 NB03 NB11 NB29 NB30 NB37

Claims (6)

[Claims] 1. A baking chamber having a heater, a baking mold removably mounted in the baking chamber, temperature detecting means for detecting a temperature in the baking chamber, and an output of the temperature detecting means. Control means for controlling the motor, the control means, the detected temperature after the first predetermined time has elapsed from the start of the firing step, the detected temperature after the second predetermined time has elapsed from the start of the firing step, Wherein the rate of energization to the heating means is determined by the temperature difference of the baking pan. 2. The control device according to claim 1, wherein the control means is configured to determine a temperature difference between the first predetermined time and the second predetermined time from the start of the firing step. 2. The bread baker according to claim 1, wherein an energization ratio until the temperature reaches one predetermined temperature and an energization ratio after the temperature reaches the first predetermined temperature are determined. 3. The control means determines a first predetermined temperature based on a temperature difference between a detected temperature after a first predetermined time has elapsed and a detected temperature after a second predetermined time has elapsed from the start of the firing step. The bread baker according to claim 1, wherein 4. The control means according to claim 1, wherein the control means is configured to supply a current after a lapse of a second predetermined time based on a difference between the detected temperature after a lapse of a first predetermined time and a temperature after a lapse of a second predetermined time. 2. A bread maker according to claim 1, wherein a time until the ratio is changed is determined. 5. A baked color selection means for selecting a baked color of bread, wherein the control means determines an energization ratio to the heating means after a second predetermined temperature based on the baked color selected by the baked color selection means. The bread baker according to claim 1, wherein the bread baker is determined. 6. A capacity selecting means for selecting a capacity of the bread, wherein the control means determines an energizing ratio to the heating means after a second predetermined temperature based on the capacity selected by the capacity selecting means. The bread baker according to any one of claims 1 to 4, wherein