JPH07103490A - Toaster - Google Patents

Abstract

PURPOSE:To provide a toaster which does not require a heating time correction according to the number of pieces and thickness of bread. CONSTITUTION:A body 1 has a door 5 on a front surface, a net 2 therein, heating means 3 such as heaters at upper and lower parts of the net 2, and a temperature detector 4 such as a thermistor at an upper innermost part. Time counting means 6 for counting a time and control means 7 for controlling the means 3 are provided in a bottom of the body 1. Further, the body 1 has heating time deciding means 8 for deciding a heating time ty from a temperature T and a temperature change rate dT by the detector 4 and a lapse time (t) after stop of energization of the heating means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toaster for determining the heating time for automatic baking.

[0002]

2. Description of the Related Art The conventional automatic toasting function of a toaster is the time elapsed from the end of the previous baking and the temperature if the power is not turned off from the end of the previous baking to the baking of this time and the leaving time is within a predetermined time. The heating time was determined from the above, and in other cases, the heating time was determined from the temperature and the rate of change of temperature.

[0003]

However, in the conventional method, the heating time is determined based on the number of breads and the thickness as standard conditions. Therefore, there is a problem that the heating time needs to be corrected by the number and thickness of the breads. Have

The present invention is intended to solve such a conventional problem, and determines the heating time according to the number and thickness of bread from the temperature, the rate of temperature change, and the elapsed time from the end of the previous baking. The first purpose is to provide a toaster having a function of making a decision.

Further, there is provided a toaster having a function of determining a heating pattern according to the number and thickness of breads from the temperature, the rate of change of the temperature, and the elapsed time from the end of the previous baking when baking the frozen breads. This is the second purpose.

[0006]

In order to achieve the first object, the present invention provides a heating means capable of heating bread in a toaster body, and a control means for controlling energization of the heating means. A temperature detecting element for detecting a temperature in the toaster body, and a time measuring means for measuring an elapsed time after the energization of the heating means is stopped and an elapsed time after the energization of the heating means is restarted. , The detection value of the temperature detection element, the rate of change of the detection value, and the elapsed time after the energization of the heating means is stopped are used to determine the heating time, and a signal corresponding to the heating time is sent to the control means. The heating time determining means for outputting is provided.

In order to achieve the second object, the present invention provides a heating means capable of heating bread in the toaster body, a control means for controlling energization to the heating means, and the toaster body. A temperature detecting element for detecting the temperature inside, a time measuring means for measuring an elapsed time after the power supply to the heating means is stopped and an elapsed time after the power supply to the heating means is restarted, and the temperature detection The detected value of the element, the rate of change of the detected value, and the heating power and the heating time at the heating power are determined by inputting the elapsed time after the energization of the heating means is stopped, and the heating power and the heating time are set. And a heating pattern determining means for outputting a corresponding signal to the control means.

[0008]

The above-mentioned means determines the heating time according to the number and thickness of breads from the detected temperature, the rate of change of the detected temperature and the elapsed time after the power supply to the heating means is stopped.

Further, by the above means, from the detected temperature, the rate of change of the detected temperature, and the elapsed time after the power supply to the heating means is stopped, the heating power corresponding to the number and thickness of the frozen bread and the heating power The heating time at is determined.

[0010]

【Example】

(Embodiment 1) A first embodiment of the present invention is shown in FIGS.
It will be explained based on. First, the overall configuration of this embodiment will be described with reference to FIG. Reference numeral 1 is a main body of a toaster, which is provided with a door 5 on the front surface, a net 2 inside, a heating means 3 such as a heater at the upper and lower parts of the net 2, and a temperature detecting element 4 such as a thermistor at the back of the upper part. The bottom of the main body 1 is provided with a clocking means 6 for measuring time and a control means 7 for controlling the heating means 3. Further, the main body 1 is provided with a heating time determining means 8 for determining the current heating time ty from the temperature T by the temperature detecting element 4, the temperature change rate dT, and the elapsed time t from the end of the previous baking of the time measuring means 6. . The clocking means 6, the control means 7, and the heating time determining means 8 are constituted by a microcomputer in this embodiment.

The operation of the above configuration will be described below. The user opens the door 5, puts bread on the net 2, and closes the door 5. Next, when the user turns on a switch (not shown) to start baking, the control means 7 causes the heating means 3 to operate.
And the temperature detection element 4 detects the temperature T in the refrigerator at the start of baking. Further, the time counting means 6 outputs the elapsed time t from the end of the previous baking, and then starts counting the elapsed time from the start of the current baking. The temperature change rate dT is obtained by subtracting the temperature T at the start of bread baking from the detected value T1 of the temperature detecting element 4 when the elapsed time from the start of bread baking reaches a predetermined value dt, that is, dT = T1−T. . The heating time determination means 8 determines the current heating time ty from the temperature T, the temperature change rate dT, and the elapsed time t from the end of the previous baking, and outputs it to the control means 7. The control means 7 stops the heating by the heating means 3 when the time of the current baking of the bread by the clocking means 6 becomes ty, and ends the baking of bread. In other words, it operates as a toaster having a function of determining the heating time according to the number of breads and the thickness from the temperature, the temperature change rate, and the time elapsed from the end of the previous baking, and baking the bread with a constant baking color.

Since the temperature detecting element 4 is installed in the upper part of the inside of the refrigerator, it has a good response to the temperature inside the refrigerator. Therefore,
When the elapsed time t from the end of the previous baking is the same, the number of breads and the thickness of the current bread can be estimated from the two inputs of the temperature T and the temperature change rate dT. For example, when baking is started at a certain temperature Tx, the temperature change rate when baking one 6-section bread is dT1, the temperature change rate when baking four 4-section bread is dT2, If the temperature change rate when baking two 6-piece breads is dT3, dT1 and dT2
The relationship between dT3 and dT3 is dT1>dT2> dT3. Therefore, conversely, if there are two inputs of the temperature T and the temperature change rate dT, the number and thickness of bread can be estimated. In addition, the heating time for baking to a predetermined baking color is determined from the number and thickness of bread and the temperature T when the baking is started. In addition, when the elapsed time t from the end of the previous baking is long, even if baking is started from the same internal temperature T, the baking is performed to a predetermined baking color because of the thermal characteristics of the heater, compared with the case where t is short. The heating time becomes longer.

Next, the operation of the heating time determining means 8 of this embodiment will be described with reference to FIGS. In the present embodiment, the heating time determination means 8 is configured by fuzzy inference that inputs the temperature T, the temperature change rate dT, and the elapsed time t from the end of the previous baking, and outputs the baking time ty of this time. The inference rule is "T is low, dT is small, and t is
If `` is short, set ty to y1 ''.
It consists of 12 rules shown in. In FIG. 2, y1 to y12 are real values.

The qualitative concept that T is "low" is shown in FIG.
It is quantitatively expressed by the membership function shown in.

As described above, according to this embodiment, it is possible to provide the toaster having the function of determining the heating time from the temperature, the temperature change rate, and the elapsed time from the end of the previous baking.

In the present embodiment, the fuzzy inference is used as the heating time determining means 8, but a neural network or a method using a function may be used. Also, as an example of fuzzy inference, the antecedent part trigonal type and the consequent part real value type fuzzy inference are used, but it is also conceivable to represent them by a triangular type or a function. Further, a method of adding a correction value, which is a function of the elapsed time from the end of the previous baking, to the heating time determined by fuzzy inference using the temperature and the rate of temperature change as inputs.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to FIGS. 4, 5 and 6. First, the overall configuration of this embodiment will be described with reference to FIG. The main body 1 includes a freezing mode switch 9 and a heating pattern determining means 10. The heating pattern determining means 10 includes the temperature detecting element 4
The heating pattern for this time is determined from the temperature T, the temperature change rate dT, and the elapsed time t from the end of the previous baking of the bread by the timekeeping means 6, and in the present embodiment, a microcomputer is used. Other than that, the same numbers are used for those having the same functions as those of the first embodiment.

The operation of the above configuration will be described below.
The user opens the door 5, puts a frozen pan on the net 2, and closes the door 5. Next, the user selects the frozen pan mode switch 9
After turning on, when a switch (not shown) is turned on to start baking, the control means 7 operates the heating means 3 and the temperature detecting element 4 causes the temperature T in the refrigerator at the start of baking.
Detect r. Further, the timer 6 outputs the elapsed time tr from the end of the previous baking process and then starts counting the elapsed time from the start of the baking process this time. The temperature change rate dTr is a value obtained by subtracting the temperature Tr at the start of bread baking from the detection value Tr1 of the temperature detecting element 4 when the elapsed time from the start of bread baking reaches a predetermined value dtr, that is, dTr = Tr1-T
Calculate as r. The heating pattern determining means 10 determines the thawing time tk, the thawing power Pk, the baking time tyr, and the baking power Py from the temperature Tr, the temperature change rate dTr, and the elapsed time tr from the end of the previous baking, and outputs them to the control means 7. To do. The control means 7 controls the heating means 3 in accordance with these outputs and the time of the timekeeping means 6, thereby baking the frozen bread. The heating is performed with the power Pk during the time tk, and then the heating is performed with the power Py during the time tyr. In other words, it operates as a toaster having a function of determining a heating pattern according to the number and thickness of frozen breads from the temperature, the temperature change rate, and the time elapsed from the end of the previous baking, and baking the breads with a constant baking color. In the present embodiment, the powers Pk and Py are output as the ON time of the heater during a certain time, that is, the power duty.

Next, the heating pattern determining means 1 of this embodiment
The operation of 0 will be described with reference to FIGS. In this embodiment, the heating pattern determination means 10 determines the temperature Tr, the temperature change rate dTr, and the elapsed time tr from the end of the previous baking.
Is input and the defrosting time tk, the defrosting power Pk, the baking time tyr, and the baking power Py of the current frozen bread are output. The inference rule is "Tr is low, d
If Tr is small and tr is short, tk is a1,
Pk is set to b1, tyr is set to c1, and Py is set to d1. " A1 in FIG.
To d12 are real values.

The qualitative concept that Tr is "low" is quantitatively expressed by the membership function shown in FIG.

As described above, according to the present embodiment, a toaster having a function of determining a heating pattern according to the number and thickness of frozen breads is provided from the temperature, the temperature change rate, and the elapsed time from the end of the previous baking. be able to.

In this embodiment, the fuzzy inference is used as the heating pattern determining means 10, but a neural network or a method represented by a function may be used. Also, as an example of fuzzy inference, the antecedent part trigonal type and the consequent part real value type fuzzy inference are used, but it is also conceivable to represent them by a triangular type or a function. Further, a method of adding a correction value, which is a function of the elapsed time from the end of the previous baking, to each parameter of the heating pattern determined by fuzzy inference using the temperature and the rate of temperature change as inputs.

[0023]

As described above, in the toaster of the present invention, the heating time is determined by inputting the detected temperature of the temperature detecting element, the rate of change of the detected temperature and the elapsed time after the power supply to the heating means is stopped. Therefore, it is not necessary to correct the heating time depending on the number and thickness of the breads when baking the breads, for example, so that the heating operation is not troublesome.

Further, the heating power and the heating time at this heating power are determined by inputting the detected temperature of the temperature detecting element, the rate of change of this detected temperature, and the elapsed time after the energization of the heating means is stopped. In this case, for example, even when baking bread in a frozen state, heating can be performed by setting appropriate heating power and heating time, and the above effect can be further enhanced.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a toaster according to a first embodiment of the present invention.

FIG. 2 is a view showing a fuzzy inference rule of a heating time determining means of the toaster.

FIG. 3 is a diagram showing a membership function of fuzzy reasoning of the heating time determining means of the toaster.

FIG. 4 is a schematic diagram of a toaster according to a second embodiment of the present invention.

FIG. 5 is a view showing a fuzzy inference rule of the heating pattern determining means of the toaster.

FIG. 6 is a view showing a membership function of fuzzy inference of the heating pattern determining means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Net 3 Heating means 4 Temperature detection element 5 Door 6 Timing means 7 Control means 8 Heating time determination means 9 Freezing pan mode switch 10 Heating pattern determination means

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tadashi Sadahira, 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor, Katsuaki Suzuki, 1006 Kadoma, Kadoma City, Osaka

Claims (2)

[Claims] 1. A heating means capable of heating bread in the toaster body, a control means for controlling energization to the heating means, a temperature detecting element for detecting a temperature in the toaster body, and the heating means. Means for measuring an elapsed time after the power supply to the heating means is stopped and an elapsed time after restarting the power supply to the heating means, a detection value of the temperature detection element, a change rate of the detection value, and the heating A toaster provided with a heating time determining means for determining a heating time by inputting an elapsed time after the power supply to the means is stopped and outputting a signal according to the heating time to the control means. 2. A heating means capable of heating bread in the toaster body, a control means for controlling energization of the heating means, a temperature detecting element for detecting a temperature in the toaster body, and the heating means. Means for measuring an elapsed time after the power supply to the heating means is stopped and an elapsed time after restarting the power supply to the heating means, a detection value of the temperature detection element, a change rate of the detection value, and the heating A heating pattern determining means for determining a heating power and a heating time at the heating power by inputting an elapsed time after the power supply to the means is stopped and outputting a signal according to the heating power and the heating time to the control means. Toaster with and.