JPH03181716A - Electronically controlled apparatus - Google Patents

Abstract

PURPOSE:To improve memory retention of memory means by a method wherein a first memory means memorizes information based on frequency of use of prescribed parts, a second memory means wires in information everytime the information memorized in the first memory means changes by a prescribed value, and a means is provided for informing that the amount of information memorized in the second memory means reaches a prescribed value. CONSTITUTION:A microwave supply circuit 6 to supply microwaves for heating food into a heating room 1 is connected to the commercial power source 9 through a first door switch 7 which turns OFF-ON in response to opening and closing of a door 3 and a switching element 8 consisting of a triac and the like. On the other hand, a control part 10 consisting of a microcomputer which controls an electronic range contains a counter DCNT as a first memory means which erases information at power OFF time and is capable of rewriting information.

Description

[Detailed description of the invention] (b) Industrial application field The present invention is an electronic control system for microwave ovens, etc. 41! Concerning vessels.

(b) Conventional technology Japanese Patent Application Laid-Open No. 163444/1983 states that the number of times a microwave oven is used is counted, and when the number of uses information based on this count reaches a predetermined value, the microwave oven becomes unreliable. A configuration for notifying the user is disclosed.

In this case, the information about the number of times the microwave oven is used is
It is necessary to store it in a storage means such as EEPROM (=EAR,OM: electrically rewritable ROM). Thereby, the use count information is stored and held in the storage means even when the power is turned off, and when the use count is updated, the updated use count information is appropriately rewritten and stored in the storage means.

However, due to its characteristics, storage means such as the EEPROM cannot retain information if the number of rewrites exceeds, for example, 10,000 times at the storage location where rewriting is performed by updating the number of times of use. It's gone and I'm depressed.

(c) Problems to be Solved by the Invention The present invention improves the memory retention of such a storage means in an electronically controlled device having a storage means such as an EEPROM that stores usage frequency information such as usage frequency information. This is what I am trying to do.

(d) Means for Solving the Problems The electronically controlled device of the present invention has a rewritable first storage means whose stored information disappears when the power is turned off, and a rewritable first storage means whose stored information does not disappear even when the power is turned off. a second storage means, the first storage means stores information based on the frequency of use of a predetermined part, and the second storage means stores information based on the frequency of use of a predetermined part;
The information is written each time the information stored in the storage means changes by a certain value, and further includes notification means for notifying when the information stored in the second storage means reaches a predetermined value. It has become.

(e) Function The second storage means is such that the stored information does not disappear even when the power is turned off and the information is rewritable, such as EEPROM Mr-11.
be decapitated. However, such information is written and stored in the second storage means every time the usage frequency information changes by a certain value, and therefore, in the second storage means, every time the usage frequency information is updated. Since information is not rewritten, the number of rewrites is reduced and retention characteristics are improved.

(7) Embodiment FIG. 1 shows the structure of a microwave oven according to an embodiment of the present invention, in which a microwave oven main body 2 having a built-in heating chamber 1 has a front opening for the heating chamber 1. A door 3 for opening and closing, a keyboard 4 for setting various information, and a display section 5 as a notification means are provided.

FIG. 2 shows a circuit of such a microwave oven, which includes a magnetron and is provided with a microwave supply circuit 6 that supplies microwaves for heating food in the heating chamber l.
The microwave supply circuit is connected to a commercial power source 9 via a first door switch 7, which is a predetermined component that turns off and on in response to the opening and closing of the door 3, and a switching element 8, such as a triac. On the other hand, a control section 10 consisting of a microcomputer that controls the microwave oven is provided.
Built-in. Around the control unit 10, there are the keyboard 4, the display unit 5, the switching element 8, and a second door switch 11 that is linked to the first door switch 7 and turns off and on in response to the opening and closing of the door 3. A storage section EEPROM, which is a rewritable second storage means whose stored information does not disappear even when the power is turned off, is arranged.

FIG. 3 shows the flow of the control program for the L-distribution microwave oven, and the operation of the microwave oven will be described below in detail based on this figure.

According to power on to the microwave oven, the control unit 10:
First, it initializes itself in step S1, and then, in step S2, the stored information in addresses A and B of the storage section EEPROM is read out, and the larger one of these stored information is stored and set in the counter DCNT. Now address A
, B are all the same, for example, 0, then the stored information in address A is stored and set in counter DCNT.

Then, the control section 10 cyclically executes steps S3 and S4. In step S3, the control section 10 determines whether the second door switch 1 linked to the first door switch 7 has been turned off and on once. That is, it is determined whether the door 3 has been opened and closed once. S
In step 4, appropriate processing is performed, such as turning the switching element 8 on and off based on the setting information from the keyboard 4 to control the energization of the microwave supply circuit 6 to control the microwave heating of the food. .

When the opening and closing of the door 3 is repeated once and an affirmative judgment is made in step S3, the control section 10 performs steps S3 and S4.
The process exits the circular execution of steps and reaches step S5, where 1 is added to the counter DCNT. Next, the control section 10
In step S6, the 10th digit of the contents of the counter DCNT to which such addition is performed is, for example, Oll, 2...
Check whether it has been updated or not. In this case, if it is determined that the update has not been performed, the control unit 10 returns to S3.
, S4 steps are executed cyclically.

After that, when the microwave oven is used repeatedly, the counter DCNTI knee 1 is added at step S5 every time the door 3 is opened and closed as described in E. As a result of this addition, the digit 10 of the contents of the counter DCNT is After updating, the control unit 1o moves from step S6 to step S7, and determines whether or not the digit of 1o is an odd number. In this case, if the control section 10 determines that the number is odd, the control section 10 stores the contents of the counter DCNT in the storage section EEPRO in step S8.
When it is rewritten and stored in address A of M and an even number is determined, S
It is rewritten and stored in address B in 9 steps. Then, the control unit 10 controls the counter DC at the Sho step.
It is determined whether the content of NT has reached 100,000. In this case, if it is determined that the step has not been reached, the control unit 10 cycles through steps S3 and S4 again.

In this way, when the content of the counter DCNT reaches 100,000 at E, the control unit 10 moves from the SlO step to S1
．． ] Step is reached, and rDOORj is displayed on the display section 5.
is displayed, informing the user of the microwave oven that it is time to replace the first door switch 7 because the door 3 has been repeatedly opened and closed and the first door switch 7 has been turned off and on 100,000 times. That is, the first door switch 7 is
It is in the power line of the microwave supply circuit 6 and is off.
Sparks are likely to be generated when the microwave is turned on, and if the microwave oven is turned off and on repeatedly 100,000 times in this state, it will be damaged and the microwave oven will become unusable.

Now, when the power to the microwave oven is turned off due to a power outage, etc.
Although the contents of the counter DCNT above disappear, the contents of the counter DCNT
Each time the 10th digit of the contents of NT is updated, the contents are rewritten and stored at addresses A and H of the storage EEPROM.
The content of the book is disgusting. When the power is restored,
The control unit 10 sets the larger of the contents of addresses A and H to the counter DC in the S2 step that occurs after the S1 step.
The settings are stored in NT, and the counter DCNT subsequently counts based on the opening and closing of the door 3 in order to perform the above-mentioned control thereafter.

As can be seen from the above explanation, the usage frequency information of the iE1 door switch 7, which is the number of times the first door switch is turned off and on, is stored in the counter DCN, which is the first storage means.
The storage section EEPRO is a second storage means.
Since M is changed to M and stored in memory, it does not disappear even when the power is turned off. Therefore, when the number of off and on times, which is the usage frequency information of the first door switch, reaches the predetermined value of 100,000 times, the first door switch The display unit 5 accurately informs the microwave oven user of the replacement time.

Further, the memory section EEPROM, which is the second memory means, stores a counter D when the first door switch 7 is turned off and on.
The contents of counter DCNT are not rewritten and stored each time 1 is added to CNT, but 1 of the contents of counter DCNT is
Each time the contents of the f counter DCNT changes by a certain value (the 0 digit is updated), the contents of the counter DCNT are changed to M and stored in either address A or B, and therefore the storage section EEPRO■ The number of times that the data is rewritten and stored in the addresses A and B becomes much smaller than the above-mentioned 100,000 times, and the memory retention characteristics of the memory section EEPROM are improved.

(G) Effects of the Invention According to the present invention, an electronically controlled device having a storage means such as an EEPROM that stores usage frequency information such as usage frequency information regarding a predetermined part in order to notify when to replace the predetermined part. In this case, the memory retention characteristics of such a storage means can be improved, and the reliability of electronically controlled equipment can be significantly improved.

[Brief explanation of drawings]

The drawings relate to a microwave oven according to an embodiment of the present invention, and FIG. 1 is an external perspective view, FIG. 2 is a circuit diagram, and FIG. 3 is a flowchart of a control program. DCNT...Counter (first storage means>, EEPRO
M... Storage section (second storage means), 5... Display section (notification means).

Claims (1)

[Claims] (1) A rewritable first storage means whose stored information disappears when the power is turned off; and a rewritable second storage means whose stored information does not disappear even when the power is turned off; The second storage means stores information based on frequency of use, and the second storage means writes such information every time the information stored in the first storage means changes by a certain value;
An electronically controlled device characterized by comprising a notification means for notifying when the stored information in the second storage means reaches a predetermined value.