JPH08305448A - Household electrical appliance and heating cooker - Google Patents

Abstract

PURPOSE: To provide the household electrical appliance and heating cooker in which the contents of a control program can be easily changed even after the preparation of a control program storage means. CONSTITUTION: A microcomputer 1 is constituted so as to register a change object address '5000H' of the control program stored in a ROM 2 as a mask pattern to a register for change and to transfer a program for change stored in an EEPROM 4 to a RAM 3 while a switch 10 for change is operated but to execute the program for change transferred to the RAM 3 and to change a constant for deciding the time of cooking due to a magnetron 14 corresponding to the detect signal of a gas sensor 6 when the address of a program counter is matched with the address '5000H' registered on the register for change during the execution of the control program.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a home electric appliance and a heating cooker controlled by a control means such as a microcomputer.

[0002]

2. Description of the Related Art Such a microcomputer (hereinafter referred to as
A mask ROM (hereinafter, simply referred to as a ROM) in which a control program for a microcomputer is stored requires a large amount of preparation cost, and usually takes about 1 to 2 months from the ordering. Therefore, rewriting the ROM once to change the contents of the ROM is rarely performed unless the change is significant considering the cost.

However, in a heating cooker, particularly in a microwave oven with many cooking items, product development is continued to improve the degree of completion of the product even after the ROM is ordered and before the product is shipped. . In addition, even in a product after shipping, a defect that cannot be predicted before shipping may be found. For this reason, there may be a case where it is desired to partially change the contents of the control program of the ROM that has already been ordered or completed.

In order to deal with such a case, conventionally, R
When there is a possibility that the control program may be changed in advance when making an order for the OM, and a changeover switch is assigned to a specific input port of the microcomputer, and it becomes necessary to change it later. Is
When the changeover switch is turned on, the microcomputer executes a change routine (change program).

[0005]

However, in such a conventional technique, the change can be made only when the change can be predicted before the ROM is made, and the change can be dealt with even if the change is necessary thereafter. I can't. Further, since a change routine which is not always necessary is incorporated in the ROM, the ROM needs a larger capacity as the possibility of change increases. In addition, it is necessary to provide the changeover switches on the board by the number corresponding to the changed portions and allocate the changeover switches to the input ports of the microcomputer, resulting in a problem that an extra mounting area is required.

The present invention is intended to solve the above problems,
The purpose is to easily change the contents of the control program even after the control program storage means is created once without requiring an extra capacity for the control program storage means and an extra mounting area on the substrate. It is to provide a home electric appliance and a heating cooker capable of

[0007]

In order to achieve the above object, the home electric appliance according to claim 1 is controlled by the control means, and the control program storage means stores a control program executed by the control means. And a storage means for work used as a work area during processing in the control program, a non-volatile storage means for storing the change program, and a change operation means. When is operated, the change target address of the control program is registered in the change register, the change program stored in the non-volatile storage means is transferred to the work storage means, and the address is changed during execution of the control program. If it matches the change target address registered in the change register, execute the change program transferred to the working storage means. Characterized in that it.

In this case, the control sensor may be provided, and the non-volatile storage means may be constituted by an EEPROM for storing a correction value for correcting the control based on the detection signal of the sensor (claim 2).

According to another aspect of the present invention, there is provided a heating cooker for heating food in a cooking chamber, a gas sensor for detecting a concentration of gas generated in the cooking chamber, and the heating unit controlled according to a detection signal of the gas sensor. A control program storing means for storing a control program executed by the control means, and a working storage means used as a working area during processing in the control program. A non-volatile storage unit for storing a cooking condition changing program and a changing operation unit are provided, and the control unit changes the change target address of the control program when the changing operation unit is operated. The change program stored in the non-volatile storage means is transferred to the work storage means, and the change program is stored during execution of the control program. Dress If a match the registered change target address change register, and executes the transferred change program in the working memory means.

According to another aspect of the present invention, there is provided a heating cooker for heating food in a cooking chamber, a temperature sensor for detecting a temperature in the cooking chamber, and a cooking temperature by the heating unit according to a detection signal of the temperature sensor. And control means for controlling the time, and a control program storage means for storing a control program executed by the control means,
The control means is provided with a work storage means used as a work area during processing in the control program, a non-volatile storage means for storing a cooking temperature and time change program, and a change operation means. When the operation means is operated, the change target address of the control program is registered in the change register, the change program stored in the non-volatile storage means is transferred to the work storage means, and the control program is being executed. When the address matches the change target address registered in the change register, the change program transferred to the working storage means is executed.

In this case, a weight sensor for detecting the weight of food is provided, and the heating means is constituted by a magnetron,
The nonvolatile storage means is constituted by an EEPROM, and the initial value of the zero point adjustment of the weight sensor is stored, and the control means performs the zero point adjustment of the weight sensor and performs cooking based on the detection signal of the weight sensor. It may be configured as described above (Claim 5).

[0012]

According to the home electric appliance of the present invention, when the changing operation means is operated, the control means registers the change target address of the control program in the change register and stores it in the non-volatile storage means. The changed program transferred to the working storage means, and if the address matches the change target address registered in the changing register during execution of the control program, the changing program transferred to the working storage means. Therefore, even after the control program storage means is created, the control program can be easily changed.

In this case, if the nonvolatile memory means is constituted by an EEPROM that stores a correction value for correcting the control based on the detection signal of the control sensor, the control can be accurately performed by the correction value (claim). Item 2).

According to the cooking device of the third or fourth aspect of the present invention, when the control means is operated by the change operation means, the change target address of the control program is registered in the change register and the nonvolatile storage is performed. If the program for changing the cooking condition or the cooking temperature and time stored in the means is transferred to the working storage means, and the address matches the change target address registered in the changing register during execution of the control program, Since the changing program transferred to the working storage means is executed, the cooking condition or the cooking temperature and the time can be easily changed.

In this case, the heating means is composed of a magnetron, the non-volatile storage means is composed of an EEPROM, and the initial value of the zero point adjustment of the weight sensor for detecting the weight of the food is stored in this, and the control means is set to the weight. If the zero point adjustment of the sensor is performed and the cooking is performed based on the detection signal of the weight sensor, cooking can be accurately performed based on the detection signal of the weight sensor whose zero point is adjusted ( Claim 5).

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to a heating cooker which is a home electric appliance such as a microwave oven will be described below with reference to the drawings. In FIG. 1 showing the electrical configuration,
The microcomputer 1 as a control means has a ROM (control program storage means) 2 for storing a control program therein and a RAM 3 (work storage means) used as a work area. The microcomputer 1 is connected to the EEPROM 4 of a serial communication system, which is a non-volatile storage means, so as to be readable and writable by an address / data bus line and a control signal line.

The output terminal of the weight sensor 5, which is a sensor, is connected to the input terminal of the microcomputer 1 so that a pulse signal corresponding to the weight of the food placed on a turntable (not shown) is given. . Further, the output terminal of the gas sensor 6 as a sensor is connected to the input terminal of the microcomputer 1 so that a detection signal can be given, and the output terminal of the door switch 7 is connected to the input terminal of the cooking chamber door ( High or low level output signals are provided according to the open / close state (both not shown).

The gas sensor 6 is provided in the exhaust passage from the cooking chamber to the outside, detects the concentration of, for example, water vapor as a gas, and outputs a higher level detection signal (voltage) as the water vapor concentration decreases. It is supposed to do.

Furthermore, the input terminal of the microcomputer 1 has an input key 8 including a cooking selection key for designating various foods to be cooked and a start key (not shown) for starting cooking.
The output terminals of are connected in a matrix so that a selection signal and a cooking start signal according to the item to be cooked are given, and the output terminal of the rotary encoder 9 for manually setting the time is connected, A pulse signal output according to the rotation is given.
In addition, a change switch (change operation means) 10 including a jumper post or a DIP switch is connected to the input terminal of the microcomputer 1, and a high or low level signal is switched depending on whether the program change is valid or invalid. It is designed to be given.

The output terminal of the timer 11 is connected to the interrupt input terminal of the microcomputer 1 so that a timer interrupt signal can be given at regular time intervals, and the clock input terminal of the microcomputer 1 is connected to the clock input terminal of the microcomputer 1. , Crystal oscillator 1
Two output terminals are connected so that a system clock signal can be given.

The output terminal of the microcomputer 1 is the display unit 1
3 is connected to the input terminals of 3 to provide a dynamic lighting signal, and is a magnetron 14 serving as heating means and a cooling fan 1 provided for cooling the magnetron 14.
It is connected to the input terminal 5 through a drive circuit (not shown) to give a drive signal. In addition, a part of the air blown by the cooling fan 15 flows into the cooking chamber.

FIG. 2 is a functional block diagram showing an electrical configuration of a portion related to the changing program execution function in the microcomputer 1. The input data buses of the collection address register (hereinafter, referred to as CORAD) 16 and the collection control register (hereinafter, referred to as CORCN) 17 which are change registers are the control unit (not shown) of the microcomputer 1 and an internal bus line. 1
Connected by eight. The output data bus of the CORAD 16 is connected to one input data bus of the comparator 19.

The other input data bus of the comparator 19 is connected to the output data bus of the program counter 20. The coincidence signal output terminal of the comparator 19 is connected to one input terminal of the AND circuit 21, and the other input terminal of the AND circuit 21 is CORCN1.
7 is connected to the output terminal. Then, AND circuit 2
The output terminal of 1 is connected to the internal interrupt input terminal of the control unit of the microcomputer 1 so as to give a branch processing request signal.

Next, the operation of this embodiment will be described with reference to FIGS. First, the control of automatic cooking according to the type of food will be described. FIG. 3 shows a flow chart of cooking control contents. When the start key of the input keys 8 is operated to start cooking (cooking start), in the determination step S1 of "manual cooking?", The microcomputer 1 operates the input key 8 before operating the start key. It is determined whether or not the selected cooking was manual cooking. In the determination step S1, the operator selects an input key to select "rice", "side dish",
When either "milk" or "liquor" has been selected, it is determined to be "NO", and the process proceeds to the determination step S2 of "milk / liquor?".

If either "rice" or "side dish" is selected in the judgment step S2,
When it is determined to be "NO"("milk" or "liquor"), the process proceeds to step S3 of "Next cooling fan on". In the processing step S3, when the microcomputer 1 gives a drive signal to the cooling fan 15 via the drive circuit (see time in FIG. 4), the next step S4 for determining "15 seconds passed?"
Move to

In the determination step S4, the cooling fan 15 is driven for 15 seconds to start exhausting residual gas in the cooking chamber prior to starting driving of the magnetron 14. The residual gas is exhausted to the outside through the exhaust passage, and the gas sensor 6 detects the concentration of the gas. The gas concentration starts to decrease due to the exhaust, and the output value Vt of the gas sensor 6 increases (see FIG. 4).

Then, 1 from the start of driving the cooling fan 15.
When 5 seconds have passed, the process goes to the next "magnetron-on" processing step S5 to give a drive signal to the magnetron 14 via the drive circuit to start heating the food (see FIG. 4, time). The process proceeds to the processing step S6 of "starting the timing of Tα", and the number of timer interrupts by the timer 11 is counted, so that the cooking time Tα described later is reached.
Start timing. Next, the process proceeds to the process step S7 of "obtaining Vt".

In the processing step S7, when the output value Vt of the gas sensor 6 is obtained, the process proceeds to the judgment step S8 of "Vt>Vmax?". In the determination step S8,
The output value Vt of the gas sensor 6 obtained in step S7 is compared with the maximum value Vmax. The initial value of the maximum value Vmax is set to zero by initialization. At the time shown in FIG. 4, heating of the food by the magnetron 14 is started, but since steam is not generated from the food for a while,
The concentration of water vapor in the cooking chamber decreases due to the exhaust by the cooling fan 15, and the output value Vt of the gas sensor 6 monotonously increases.

At decision step S8, Vt> Vmax
If it is determined to be “YES”, the next “Vmax ← Vt”
Process step S9, the output value Vt at that time
Is updated to the maximum value Vmax. After that, while determining “YES” in step S8, that is, in FIG.
In step S7, steps S7 to S9 are repeated while the output value Vt rises from time to time shown in FIG.

When the minimum value (maximum output value Vt) is reached at the time immediately before the start of steam generation from the food, the concentration of steam starts to increase and the output value Vt starts to decrease. That is, in the determination step S8, when the time when the output value Vt of the gas sensor 6 shows the maximum value Vmax has passed and Vt ≦ Vmax is satisfied and it is determined to be “NO”,
The process moves to the process step S10 of "calculate (1-α) · Vmax".

In processing step S10, (1-
α) · Vmax is calculated. Here, the constant α is set to determine that the output value Vt of the gas sensor 6 has dropped from the maximum value Vmax by a certain percentage, that is, to determine cooking conditions (see FIG. 4, time). . And
After the above calculation is performed, “Vt ≦ (1−α) · Vmax
? The determination step S11 is performed.

In the judgment step S11, it is judged whether or not the output value Vt of the gas sensor 6 is less than or equal to the value (1-α) · Vmax calculated in step S10. That is, from the time when the output value Vt is larger than (1−α) · Vmax, it is determined to be “NO”, the process proceeds to the process step S12 of “obtaining Vt” to obtain the output value Vt, and then to the determination step S11. Return and repeat the above judgment.

Then, in the judgment step S11, when the output value Vt becomes less than or equal to (1-α) · Vmax, that is, when the time elapses, it is judged "YES" and the next "obtain Tα" processing step. The process moves to S13. In the processing step S13, when the time Tα between the time and the time when the clocking is started in the step S6 is obtained, the process proceeds to the next “calculate Tβ = Tα · β” processing step S14. Here, the constant β is a coefficient for determining the cooking time Tβ from time to time (determining cooking conditions). When the cooking time Tβ is calculated by multiplying the time Tα obtained in step S13 by a constant β, “Tβ clock start”
The processing shifts to the processing step S15. Here, the constants α and β are set to 0.05 and 1.3 in the case of “rice” and 0.10 and 0.5 in the case of “side dish”, respectively, as shown in FIG. ing.

In processing step S15, the time counting of the cooking time Tβ calculated in step S14 is started. Then, the process proceeds to the processing step S16 of "remaining time display". In the processing step S16, the cooking time Tβ is
When the remaining time of cooking is displayed on the display unit 13, “T
Beta progress? The determination step S17 is performed.

In the judgment step S17, it is judged whether or not the cooking time Tβ has elapsed, and if the cooking time Tβ has not elapsed, "N
When it is determined to be "O", the process proceeds to step S16, the remaining time is down-counted, for example, in seconds, and the display is updated. Thus, when the cooking time Tβ has elapsed, that is, the time has been reached, and if “YES” is determined in the determination step S17, the process proceeds to the processing step S18 of “cooking end processing”.

In the processing step S18, the magnetron 14 and the cooling fan 15 are stopped, and in order to inform the operator that the cooking is finished, a cooking end process such as sounding a notification buzzer (not shown) is performed, and the operation is finished. Yes (end).

On the other hand, if the microcomputer 1 determines "YES"("milk" or "liquor") in the determination step S2, it shifts to the "weight W measurement" processing step S19. In the processing step S19, the weight sensor 5 measures the weight W of the milk or liquor placed on the turntable.
When measured by, the process proceeds to processing step S20 of "cooling fan on magnetron on". In the processing step S20, when driving signals are supplied to the cooling fan 15 and the magnetron 14 to start cooking, the process proceeds to the next "calculate cooking time T" processing step S21.

In the processing step S21, as shown in FIG. 6, the cooking time T is calculated and determined by a linear function according to the weight W obtained in step S19.
In this case, the constants α and β are given as the slope and intercept of the linear function, respectively, and different values are given depending on the selection of milk or sake. Therefore, the cooking time T can be obtained by calculating T = α · W + β. Here, as shown in FIG. 6, the constants α and β are set to 0.21 and 25 for “milk” and 0.14 and 22 for “liquor”, respectively.

When the cooking time T is calculated by obtaining these constants, the process proceeds to the next "remaining time display" processing step S22 to display the cooking time T on the display unit 13. And
The process proceeds to the judgment step S23 of "time T has elapsed" to judge whether or not the cooking time T has elapsed. If the result is "NO", the process moves to step S22 to display the remaining time on the display unit 13. Are down-counted and updated as described above.
In the determination step S23, when the cooking time T has elapsed and it is determined to be "YES", the step S24 similar to the step S18 is performed and the "zero point adjustment" processing step S is performed.
Move to 25.

In processing step S25, the zero point of the weight sensor 5 is adjusted. The EEPROM 4 stores an initial value of the zero point W0 of the weight sensor 5,
Since this zero point W0 changes with time, it is necessary to make an adjustment. The zero point adjustment is performed by the following procedure.

First, the microcomputer 1 judges from the output signal of the door switch 7 whether or not the door is opened / closed after the cooking is completed, and if it is judged that the door is opened / closed, the value detected by the weight sensor 5 at that time is read and the cooking time is shown. It is determined whether there is a more significant difference. And when it is judged that there is a difference from when cooking,
It is estimated that the cooked food is taken out of the cooking room by the user, nothing is placed on the turntable, and the weight sensor 5 is in an unloaded state. The detected value at this time is the initial value. If it is out of the allowable error range based on W0, the detected value is written in the EEPROM 4 as the current zero point W0 of the weight sensor 5 and updated. When the detected value is significantly larger than the initial value W0 of the zero point, the zero point adjustment is not performed.

When detecting the weight of food after that, EE
This updated zero point W0 is read from PROM4,
The weight sensor 5 detects the weight based on the zero point W0 from the value indicated at that time. The zero point adjustment does not necessarily have to be performed every time cooking is performed, but may be performed once when the number of cooking times is counted and the count value reaches an appropriate value (for example, 10). When this zero point adjustment is performed, the operation ends.

In step S1, the microcomputer 1 returns "YES"("rangestrong" or "range weak").
If it is determined that the cooling fan 15 is turned on, the process proceeds to step S26 of “cooling fan on magnetron on”, and the cooling fan 15
Further, when a driving signal is given to the magnetron 14 to cause the magnetron 14 to oscillate with a strong output or a weak output to start cooking, the process proceeds to the next "remaining time display" processing step S27, and the rotary encoder 9 is used before starting cooking. The set cooking time Tm is displayed on the display unit 13.

Then, the process proceeds to a judgment step S28 for "elapse of time Tm?" To judge whether or not the cooking time Tm has elapsed. If the result is "NO", the process advances to step S27 for display section. Similarly, the remaining time display of 13 is down-counted and updated. Then, in the determination step S28, if the cooking time Tm has elapsed and it is determined to be "YES", the process proceeds to step S18.

The control program relating to the above-described processing is stored in the ROM 2 as a mask pattern, and the microcomputer 1 directly reads the control program from the ROM 2 and executes it if there is no change in the control program. .

Next, a process for changing a part of the control program shown in FIG. 3 will be described with reference to FIG. FIG. 8 shows the control contents of the initial processing when the power is turned on. First, when power is turned on and the reset of the microcomputer 1 is released, the microcomputer 1 reads the input port to which the change switch 10 is assigned in the determination step R1 of "change switch on?" It is determined whether the change switch 10 is on (is operated). For example, if the change switch 10 is at a low level and indicates ON, and if "YES" is determined in the determination step R1, the process proceeds to a process step R2 of "transfer EEPROM change program to RAM".

In processing step R2, EEPRO
When the contents stored as a changing program in M4 are read out as serial data, they are transferred to the RAM 3 inside the microcomputer 1. Here, the program includes a program for reading data. Then, the process proceeds to the next "Set target address for change in register" processing step R3.

At the processing step R3, the change target address in the control program, that is, for example, 5000H (H indicates hexadecimal number) is set as the start address of the change program transferred to the RAM 3 at step R2. Set to internal CORAD16. This change target address is previously incorporated in the control program. Next, the process proceeds to the processing step R4 of "permit execution of the changing program".

In processing step R4, CORCN
When the execution of the changing program is permitted by setting the data “1” in 17, the process proceeds to the judgment step R5 of “Start cooking?”. In the judgment step R5, it is judged whether or not cooking is started by judging whether or not any one of the input keys 8 is operated by the operator.

If none of the input keys 8 is operated and it is judged "NO" in the judgment step R5,
The process moves to the process step R6 of the "standby process", for example, the process in standby such as time display by a real-time clock (not shown) is performed on the display unit 13, and the process returns to the determination step R5. If any one of the input keys 8 is operated and it is determined “YES” in the determination step R5, the process proceeds to the “cooking” processing step R7, and the input key 8
When the start key is operated, the flowchart of the control content shown in FIG. 3 described above is executed.

Further, in the judgment step R1, the change switch 10 is at the high level and is off.
If "NO" is determined, the process proceeds to the determination step R5 without executing steps R2 to R4, and thereafter, the same operation as described above is performed.

FIG. 9 is a flow chart showing the control contents of the changing program transferred from the EEPROM 4 to the RAM 3. This changing program has the same structure as the subroutine for reading the constants α and β incorporated in the control program of the ROM 2, and is different only in the data values of the changed constants α and β. This subroutine is based on steps S10 and S1 of the control program.
In 4 and S21, the constants α and β are called before the calculation using the constants α and β is performed.

First, in the judgment step T1 of "α change?", It is judged whether or not an argument indicating the α change is passed in the subroutine call instruction. If the judgment is "YES", the judgment steps T2 to At T5, it is determined whether the current cooking target is "milk", "liquor", "rice" or "side dish", and the corresponding changed value of the constant α is given in each of the processing steps T6 to T9. Has become.

If it is determined in the decision step T1 that the passed argument does not indicate α change and is “NO”, the process proceeds to the decision step T10 of “β change?” And the passed argument is a constant. If it is determined whether or not it indicates β change, and if “YES” is determined, the current cooking target is “milk” in determination steps T11 to T14.
It is determined whether it is "liquor", "rice" or "side dish", and the corresponding changed value of the constant β is determined in the processing step T.
15 to T18, respectively.
Further, if it is judged in the judgment step T10 that the passed argument does not indicate the change of the constant β and is “NO”, the process is exited and the process returns to the main routine.

Next, a case where the changing program is executed will be described with reference to FIG. Figure 10 (a)
Is ROM2, (b) is RAM3, and (c) is EEP
6 shows an example of an address map of a portion related to a changing program of the ROM 4. ROM shown in FIG. 10 (a)
A subroutine SUB for providing the constants α and β before the change is arranged at the second address 5000H. Further, at the addresses 1000H and 2000H, subroutine call instructions "CALL SUB (α)" and "CALL
SUB (β) ”is arranged at the address 1000
The constants α and β are obtained at H and 2000H, respectively.

Further, the address 10000H of the RAM 3 shown in FIG. 10B is EEPRO shown in FIG. 10C.
The changing program transferred from the M3 address 30000H is arranged. Also, the address 20000H
To the branch instruction "BR 10
000H ”is arranged.

Now, when the cooking target is "rice",
When the flowchart shown in FIG. 3 is executed, step S
In order to calculate (1−α) · Vmax in 10, the “CALL SUB (α)” at address 1000H is executed and the constant α is read. At this time, the program counter 20 is switched to the start address 5000H of the subroutine SUB.

Then, the value of the program counter 20
The output terminal of the comparator 19 becomes high level when the value set in the CORAD 16 in step R3 matches. In addition, the step R
Since "1" is set at 4, the output terminal of the AND circuit 21 also becomes high level, a branch request signal is generated inside the microcomputer 1, and the branch instruction "BR 200
00H ”is issued. The branch instruction "BR 20000H" issued when the branch request signal is generated is fixedly set by the hardware in the control unit of the microcomputer 1.

Then, the branch instruction "BR 20000H"
Is issued, the microcomputer 1 sends the address 2 of the RAM 3
Branch to 0000H, execute the instruction located there, that is, "BR 10000H", and execute address 10
Then, the program for branching shown in FIG. 9 is executed. Since .alpha. Is given as an argument, if the changed value 0.04 of the constant .alpha. Is read through steps T1, T2, T3, T4 and T8, the process is exited and the process returns to the main routine. At this time, the return address 1001H of the control program stacked on the stack (not shown) is set in the program counter 20, and the process returns to the main routine of the control program.

In step S14, Tα · β
"CALL S at address 2000H
Similarly, when the constant β is read by executing “UB (β)”, the program counter 20 is similarly switched to the start address 5000H of the subroutine SUB.

Thereafter, the changing program shown in FIG. 9 is executed by the same process as described above. In this case, since β is given as an argument, steps T1, T10,
When the changed value 1.5 of the constant β is read through T11, T12, T13 and T17, the process is exited and the process returns to the address 2001H of the main routine.

When the cooking target is a "side dish", the same process is performed until the start address 10000H of the changing program is branched. When the constant α is read, steps T1, T2, T3 and T4 are performed. , T5 and T9, the changed value 0.08 of the constant α is read, and when the constant β is read, steps T1, T10, T11, T12, T1 are performed.
3, the changed value 0.08 of the constant β is read out through T14 and T18.

Further, the cooking target is "milk" or "liquor".
If so, the constants α and β are read in order to calculate α · W + β in step S21, so that the subroutine call instruction is executed at a different address of the control program. If the cooking target is "milk" and the constant α is read, the changed value 0.25 of the constant α is read through steps T1, T2 and T6, and if the constant β is read, steps T1 and T10 are read. , T11 and T15, the changed value 10 of the constant β is read out. Further, when the cooking target is "liquor" and the constant α is read, steps T1, T2, T3 and T
When the modified value 0.15 of the constant α is read via 7 and the constant β is read, the modified value 20 of the constant β is read via steps T1, T10, T11, T12 and T16.

As described above, according to the present embodiment, when the change switch 10 is operated, the microcomputer 1 for controlling the microwave oven has the change target address of the control program stored in the ROM 2 as the mask pattern. 500
0H is registered in COLAD16 and EEPROM
Transfer the changing program stored in 4 to the RAM 3,
The address of the program counter 20 is 5000, which is registered in the COLAD 16 during execution of the control program.
When it matches H, the changing program transferred to the RAM 3 is executed, and the constants α and β that determine the cooking time by the magnetron 14 are changed according to the detection signal of the gas sensor 6.

Therefore, even after the ROM 2 is created once,
The control program can be changed easily.
Since the changing program can be modified by rewriting the EEPROM 4, it is possible to deal with a problem which could not be foreseen when the ROM 2 was ordered. Furthermore, it is not necessary to provide a plurality of changing switches 10, and an extra board area is not required. in addition,
Since it is not necessary to create an extra change routine inside the ROM 2, the capacity of the ROM 2 can be minimized.

Further, according to the present embodiment, the weight sensor 5 is provided, the initial value W0 of the zero point adjustment of the weight sensor 5 is stored in the EEPROM 4, and the microcomputer 1 performs the zero point adjustment of the weight sensor 5 and Since the cooking is performed based on the detection signal of the weight sensor 5, the cooking can be accurately performed based on the detection signal of the weight sensor 5 whose zero point is adjusted.

In addition to the above, EE
The PROM 4 is usually provided in a microwave oven equipped with the weight sensor 5 as a storage means for storing the initial value W0 for adjusting the zero point thereof. Therefore, as in the present embodiment, the changing program is stored in the EEPROM 4. In this case, it is not necessary to provide a special non-volatile storage means for storing the changing program, so that it can be carried out easily and easily and without increasing the cost.

The present invention is not limited to the embodiments described above and shown in the drawings, but the following modifications are possible. The heating means is not limited to the magnetron, but may be an electric heater. The sensor is not limited to the weight sensor 5 and the gas sensor 6, but may be a temperature sensor or an optical sensor. Further, the gas sensor 6 may be one that detects the concentration of alcohol or the like. The heating cooker is not limited to the microwave oven, but may be a microwave oven. Further, the heating means of the electric oven or the electric oven / toaster may be controlled by a microcomputer or the like. In this case, for example, the temperature sensor may detect the ambient temperature (cooking temperature) in the cooking chamber, the electric heater may be used to correct the cooking temperature or the cooking time, and the detection signal of the temperature sensor may be corrected. It is possible.

The household electric appliances are not limited to the microwave oven, but may be a rice cooker or an electric washing machine. For example, in the case of a rice cooker, it is possible to detect the ambient temperature such as room temperature by a temperature sensor and correct the cooking temperature during rice cooking accordingly. Further, in the case of an electric washing machine, the amount or quality of laundry is detected by the amount of cloth or quality detecting means as a sensor, and the water level of the washing tub, the washing time, and the strength of the water flow are corrected according to the detection signal. Can be configured as follows. The nonvolatile storage means is not limited to the EEPROM 4,
It may be a PROM or a one-time PROM. The level for invalidating or validating the changing program of the changing switch 10 may be high or low.

The values before and after the change of the constants α and β are not limited to those described and may be changed appropriately. Change program from EEPROM4 to address 20000 in RAM3
Alternatively, the program may be transferred to H, and the execution of the changing program may be directly started when “BR 20000H” is issued. The constants α and β are changed for all cooking objects. However, for the cooking object constants that do not need to be changed, the same value as the original control program should be written and read in the changing program. Is also good. Further, instead of reading out different constants, for example, the calculation formula of the cooking time itself may be changed.

Although the constants α and β are changed in one subroutine program, the changed values of the constants α and β are read separately from the main routine, but both may be read at once. good. Further, in that case, the subroutine program may not be configured and may be read out by a normal instruction step incorporated in the main routine. Further, the microcomputer 1 has a change register and a comparator 2
Two or more different change target addresses are set, and the branch request signals issued when they match the value of the program counter 20 are different addresses, so that the constants α and β are changed by different subroutines. It may be configured to be changed programmatically. Also, another change program may be executed.

The changing program is not limited to that shown in FIG. 9, but may be changed as appropriate according to the type of home electric appliance. Further, it may be one that corrects a bug in the control program in the ROM 2. The change target address 5000H and other addresses shown in the address map may be changed as appropriate.
Further, the branch instruction issued when the comparator 19 becomes high level is not limited to “BR 20000H”, and the address may be changed appropriately or a conditional branch instruction may be used. Not only changing cooking time, but magnetron 1
The output of 4 may be changed. Comparator 1
When the output terminal of 9 becomes high level, the internal interrupt vector in the control unit of the microcomputer 1 is issued, and the internal interrupt vector can be programmed by the programmer when the ROM 2 is created, and the branch address can be changed. It may be configured as follows.

[0073]

Since the present invention is as described above,
The following effects are obtained. According to the home electric appliance according to claim 1, when the changing operation means is operated, if the address coincides with the change target address registered in the changing register during the execution of the control program, the work operation is performed. Since the changing program transferred to the storage means is executed, it is possible to easily change the control program even after the control program storing means is created without incorporating the changing program in the control program storing means in advance. Therefore, it is possible to deal with a problem that could not be foreseen before the control program storage means was created.

According to the home electric appliance of the second aspect, the non-volatile storage means is constituted by the EEPROM for storing the correction value for correcting the control based on the detection signal of the control sensor, so that the change program is already installed. It can be stored in the EEPROM, and its changing program is
It can be corrected by rewriting the EEPROM.

According to the cooking device of the third or fourth aspect, when the changing operation means is operated, the address matches the change target address registered in the changing register during execution of the control program. In this case, since the program for changing the cooking condition or the cooking temperature and the time transferred to the working storage means is executed, the cooking condition or the cooking temperature and the time can be easily changed.

According to the fifth aspect of the present invention, the heating means is composed of a magnetron, the non-volatile storage means is composed of an EEPROM, and the initial value of the zero point adjustment of the weight sensor for detecting the weight of the food is stored. Since the control means is configured to adjust the zero point of the weight sensor and execute the cooking based on the detection signal of the weight sensor, the same effect as in claims 1 and 2 can be obtained in the case of cooking by the magnetron. be able to.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing an electrical configuration of a portion related to a changing program execution function.

FIG. 3 is a flowchart of a control program

FIG. 4 is a diagram showing control characteristics when cooking rice and side dishes.

FIG. 5 shows values of constants α and β, where (a) is before change and (b) is after change.

[Figure 6] Milk and sake equivalent to Figure 4

FIG. 7 is a view corresponding to FIG.

FIG. 8 is a flowchart of an initial process when the power is turned on.

FIG. 9 is a flowchart of a changing program

[Figure 10] Address map

[Explanation of symbols]

1 is a microcomputer (control means), 2 is a ROM
(Control program storage means) 3, RAM (working storage means), 4 EEPROM (nonvolatile storage means), 5 weight sensor, 6 gas sensor (sensor), 10 change switch (change operation means) , 14 is a magnetron (heating means), 16 is a collection address register (change register), and 20 is a program counter.

Claims (5)

[Claims] 1. A home electric appliance controlled by a control means, a control program storage means for storing a control program executed by the control means, and a work area used as a work area during processing in the control program. A storage unit, a non-volatile storage unit in which a change program is stored, and a change operation unit, wherein the control unit sets a change target address of the control program when the change operation unit is operated. Registering in the changing register and transferring the changing program stored in the non-volatile storage means to the working storage means,
A home electric appliance, characterized in that, when the address coincides with a change target address registered in a change register during execution of the control program, the change program transferred to the working storage means is executed. 2. A control sensor is provided, and the non-volatile storage means is constituted by an EEPROM that stores a correction value for correcting control based on a detection signal of the sensor. Household appliances. 3. Heating means for heating food in the cooking chamber,
A heating cooker having a gas sensor for detecting the concentration of gas generated in the cooking chamber and a control means for controlling the heating means for cooking according to a detection signal of the gas sensor, the heating cooker being executed by the control means. Control program storage means for storing a control program, work storage means used as a work area during processing in the control program, non-volatile storage means for storing a cooking condition changing program, and When the change operation unit is operated, the control unit registers the change target address of the control program in the change register and changes the address stored in the non-volatile storage unit. The program is transferred to the working storage means, and its address is stored in the changing register during execution of the control program. If a match to the recording has been change target address, cooking device and executes the transferred changed program to the working storage unit. 4. Heating means for heating food in the cooking chamber,
A heating cooker having a temperature sensor for detecting the temperature in the cooking chamber, and a control means for controlling the cooking temperature and time by the heating means according to a detection signal of the temperature sensor, wherein the control executed by the control means A control program storing means for storing a program; a working storing means used as a working area during processing in the control program; a non-volatile storing means for storing a cooking temperature and time changing program; When the change operation means is being operated, the control means registers the change target address of the control program in the change register and changes stored in the non-volatile storage means. Program is transferred to the working storage means, and its address is changed during the execution of the control program. If it matches the registered change target address data, cooking device and executes the transferred changed program to the working storage unit. 5. A weight sensor for detecting the weight of food is provided, the heating means is constituted by a magnetron, the non-volatile storage means is constituted by an EEPROM, and an initial value of zero-point adjustment of the weight sensor is stored. 5. The heating cooker according to claim 3, wherein the control means adjusts the zero point of the weight sensor and executes cooking based on a detection signal of the weight sensor.