JPH0747191A - Washing machine - Google Patents

Abstract

PURPOSE:To control most suitablly a washing machine by detecting water temperatures at regular intervals and, on the basis of a variation in values detected, by calculating an accurate water-supply temperature. CONSTITUTION:On the basis of a variation in values detected at regular intervals by a water temperature-detecting means 8 provided on a water-supply passage to a washing tub, an accurate water-supply temperature varying every moment is operated, and a water temperature inside a washing machine is determined thereby. On the other hand, the accurate water-supply temperature varying every moment is indicated by an indicating means 11. When the water- supply temperature deviates from a temperature suitable for washing, warning is given by the indicating means 11 or is informed by a buzzer 10, and when the water-supply temperature becomes at an abnormal temperature, water supply is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric washing machine having a built-in microcomputer.

[0002]

2. Description of the Related Art A washing machine equipped with a water temperature detecting means in a washing machine, as shown in an embodiment of Japanese Patent Laid-Open No. 3-237997, changes a series of operations such as washing time and rinsing frequency according to the water temperature. Was.

[0003]

However, in the above-mentioned embodiment, due to the influence of the response time of the water temperature detecting means (for example, a thermistor), the accurate water supply temperature immediately after the start of the water supply or when the water supply temperature changes midway. There was a problem that could not be detected. Also, since the water temperature is not known to the user,
When water and hot water are mixed by a mixing faucet or the like to supply an appropriate amount of hot water, there are problems that it is difficult to adjust the hot water temperature and that hot water is supplied to damage clothes.

The washing machine of the present invention has been made in view of the above problems, and the water temperature detecting means detects the water at a predetermined time interval, and calculates an accurate feed water temperature based on the amount of change in the detected value. Further, the water temperature in the entire washing tub is determined based on the water supply temperature, and the washing time and the number of rinses are changed according to the water temperature.

Further, the water supply temperature is successively displayed on the display means to facilitate the adjustment of the hot water temperature by the mixing faucet, and when the water supply temperature deviates from an appropriate temperature suitable for washing, a warning display or a buzzer is displayed by the display means. The purpose is to give a warning sound and stop water supply immediately when it reaches a temperature that may damage clothes or washing machines to prevent damage to clothes or washing machines. Is.

[0006]

In order to achieve the above object, the washing machine of the present invention detects a water temperature detecting means provided in a water supply path to a washing tub and a water level of the washing water in the washing tub. A water level sensor, a water supply means for automatically supplying the washing water to a predetermined water level, a display means for displaying operation contents in each step of water supply, washing, rinsing and dehydration, and controlling each of the steps, In a washing machine having a control means for displaying operation contents on a display means, the control means corrects the detected value based on a change amount of the detected value obtained from the water temperature detection output from the water temperature detection means at constant time intervals. The water supply temperature calculating means for calculating the water supply temperature is provided. Further, the control means is provided with means for judging the water temperature in the washing tub from the water supply temperature and changing a series of operations such as the washing time and the number of times of rinsing. Further, the control means includes means for sequentially displaying the determined water supply temperature on the display means. Further, the control means includes means for displaying a warning on the display means when the feed water temperature deviates from a predetermined temperature range. Further, the control means is provided with means for issuing a warning sound by the notification means when the feed water temperature deviates from a predetermined temperature range. Further, the control means includes means for stopping the water supply when the water supply temperature deviates from a predetermined temperature range.

[0007]

The water temperature detecting means calculates an accurate water supply temperature every moment based on the amount of change in the detected value detected at regular time intervals, and determines the water temperature in the washing machine from the water supply temperature. Accurate water supply temperature every moment, display the display means,
When the temperature deviates from the temperature suitable for washing, a warning display or warning sound is given, and when the temperature becomes abnormal, water supply is stopped.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. The microcomputer 1 as a control means executes each process of water supply, washing, rinsing, and dehydration according to the key input of the input means 2. Further, as an external circuit of the micro computer 1, a state detection circuit 7 for detecting the water temperature, the water level, etc. by the water temperature detecting means 8 and the water level sensor 9, the time,
Display device 1 for displaying the temperature, water level, detergent amount, water temperature, etc.
Buzzer-1 for sound notification of 1, end and error occurrence
0, a water supply valve 4, a drain valve 5, and a load drive circuit 3 for controlling the drive motor 6. In addition, 12 has shown the printed wiring circuit board.

FIG. 2 is a schematic structural diagram for explaining the present invention. A dehydration tub 22 having a dehydration hole (not shown) is rotatably provided inside the washing tub 21, and a stirring blade 23 is rotatably provided at the center of the bottom of the dehydration tub 22. A driving motor 6 drives the dehydration tank 22 and the stirring blades 23 via a belt 24 and a mechanism portion 25. Reference numeral 4 is a water supply valve for opening and closing the water supply port, and 5 is a drainage valve for opening and closing the drainage port. Water level sensor that detects the water level in the tank
9. A washing machine equipped with a water temperature detecting means 8 for detecting the water supply temperature.

In the washing machine of this embodiment having such a mechanical structure, the drain valve 5 is closed, and after the water is supplied into the washing tub, the motor 6 starts to drive, and the motor 6 is driven. The output drives the stirring blade 23 via the belt 24 and the mechanism portion 25, whereby the steps of washing and rinsing are performed. In addition, during dehydration, the drain valve 5 is opened to drain the rinse water in the washing tub, and then the clutch (not shown) incorporated in the mechanism section 25 is switched, and the output of the motor 6 is output through the drive system. Is the dehydration tank 2
2, the dehydration tank 22 itself is rotated, and the dehydration process is performed.

FIG. 3 is a flow chart showing a program of the washing machine of this embodiment. In step # 10, the power switch is turned on, the water level is set in step # 15, the start switch is turned on in step # 20, and water supply is started in step # 25. In step # 30, the feed water temperature T and the number of times of detection n are initialized. Step # 35
Determines whether or not the water level has reached a predetermined set water level, and if NO, advances to step # 40 to set the detection count to 1
Increment only. In step # 45, the detected value t _n
Is detected, the feed water temperature T _n is calculated in step # 50, and the feed water temperature T _n is displayed in step # 55. Step # 6
At 0, it is judged whether or not the feed water temperature T _n is in the range of 0 to 50 ° C. If it is NO, the display is blinked at step # 65, and the error sound is notified at step # 70. Further, in step # 75, it is determined whether or not the feed water temperature T _n is 60 ° C. or higher, and if YES, step # 75
If the water supply is stopped at 80 and the answer is NO, the process proceeds to step # 85, and every 2 seconds until the water level reaches the set water level, step # 85.
The steps from 40 to # 90 are repeated. When the water level reaches the set water level, the water supply is stopped in step # 95, the water temperature S of the entire washing tub is calculated in step # 100, the washing time and the number of rinses are determined in step # 105, and the washing in step # 110. Go to the process.

As described above, the washing machine of this embodiment has the detected value t.
Detect _n every 2 seconds. The water temperature detection means 8 has a response characteristic as shown in FIG. 4 due to the heat capacity peculiar to the element, and when the temperature fluctuates immediately after or during the start of water supply, the detected value t _n at the time of detection is not always accurate. It cannot be said that it indicates temperature. Therefore, in this embodiment, the detected value t _{n-1 of the} previous detection is
And the detected value t _n at the present time, the feed water temperature T _n = f (t _n , t
_n-1 ) is obtained. The function f (t _n , t _n-1 ) is the water temperature detecting means 8
It depends on the response characteristics of. For example, the function f (t _n , t
_n-1) is represented by the formula corrected by a change amount as _{T n = t n + (t} n -t n-1) / 2. That is, since the water temperature detecting means 8 has a delay in its response time, the value shown at the time of detection is not accurate. The accurate temperature at the time of detection is the water temperature detection means 8
The value is corrected by the response characteristics of. In this way, an accurate feed water temperature can be obtained from moment to moment, so that accurate control with little error becomes possible. Depending on the response characteristic of the water temperature detecting means 8, the detected value two or more times before may be used.

Further, the water temperature S of the entire washing tub from the sum T = oT _n and the detection number n of the feed water temperature T _n of momentary until the water supply is completed, the entire washing tub water temperature S = f (T , N). For example, the function f (T, n) is S = ΣT _n /
It is represented by n. This is to find the average temperature of the feed water temperature T _n . By such a method, even if the water supply temperature fluctuates during the water supply, the almost accurate water temperature S in the entire washing tub can be obtained, and the washing time, the number of rinses, and the like can be accurately determined. The function f (T, n) is experimentally determined.

Further, the water supply temperature T _n is successively displayed on the display means 11 during water supply. As a result, the user can adjust the water faucet while checking the water supply temperature, so that the water temperature suitable for washing can be easily adjusted.

When the supply water temperature T _n deviates from the range of 0 <T _n ≤50 ° C., the water temperature indicator of the display means 11 is rapidly blinked to display a warning. As a result, the user immediately knows that the water supply temperature is not the optimum temperature. Also, the water temperature T
_{When n} deviates from the above temperature, a buzzer gives an error sound notification, so that the user can know that the water supply temperature is not appropriate even at a remote place.

Further, when the water supply temperature T _n is a temperature that causes damage to the structural material of the washing machine or damages clothes, in the embodiment, 60 ° C. ≦ T _n , water is supplied immediately. Stop. This can prevent damage to the washing machine and clothes.

[0017]

As described above, in the washing machine of the present invention, the water temperature detecting means provided in the water supply path to the washing tub, the water level sensor for detecting the water level of the washing water in the washing tub, and the washing Water supply means for automatically supplying water to a predetermined water level, display means for displaying operation contents in each step of water supply, washing, rinsing, and dehydration, and control of each step, and display operation contents on the display means In a washing machine equipped with a control means, the control means corrects the detected value based on the amount of change in the detected value obtained from the water temperature detection output from the water temperature detection means at regular time intervals, and calculates the water supply temperature. Since the temperature calculating means is provided, it is possible to accurately detect the temperature of the water supply and the temperature in the washing tub, which enables highly accurate control.

Further, in the present invention, the control means has means for judging the water temperature in the washing tub from the water supply temperature and changing a series of operations such as the washing time and the number of rinses, so that the automatic control by the water temperature can be performed. It will be possible.

In the third aspect, the control means has means for successively displaying the determined water supply temperature on the display means, so that water can be supplied while confirming the display of the water supply temperature.

Further, in the present invention, the control means is provided with means for displaying a warning on the display means when the feed water temperature deviates from a predetermined temperature range. Is easy to adjust.

Further, in the present invention, the control means is provided with means for issuing a warning sound by the notifying means when the feed water temperature deviates from a predetermined temperature range. Therefore, it is easy to adjust the water temperature.

In the sixth aspect, the control means has means for stopping the water supply when the water supply temperature deviates from the predetermined temperature range. Therefore, when the water supply temperature becomes abnormally high,
Immediately stop water supply to prevent damage to clothes and washing machine.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a washing machine of the present invention.

FIG. 2 is a schematic structural diagram showing an embodiment of a washing machine of the present invention.

FIG. 3 is a flow chart showing a program of the washing machine in this embodiment.

FIG. 4 is a diagram showing a response characteristic of a water temperature detecting means.

[Explanation of symbols]

 1 Microcomputer 2 Input means 3 Load drive circuit 4 Water supply valve 5 Drain valve 6 Drive motor 7 State detection circuit 8 Water temperature detection means 9 Water level sensor 10 Buzzer 11 Display means 12 Printed wiring circuit board 21 Washing tub 22 Dehydration tank 23 Stirring blade 24 Belt 25 Drive mechanism

Claims (6)

[Claims] 1. A water temperature detecting means provided in a water supply path to the washing tub, and a water level sensor for detecting the water level of the washing water in the washing tub.
A water supply means for automatically supplying the washing water up to a predetermined water level, a display means for displaying operation contents in each step of water supply, washing, rinsing, and dehydration, and controlling each step and operating the display means. In a washing machine having a control means for displaying contents, the control means corrects the detected value based on the amount of change in the detected value obtained from the water temperature detection output at regular time intervals from the water temperature detection means to correct the water supply temperature. A washing machine comprising a water supply temperature calculating means for calculating 2. The washing machine according to claim 1, wherein the control means comprises means for judging the water temperature in the washing tub from the water supply temperature and changing a series of operations such as washing time and number of rinses. . 3. The washing machine according to claim 1, wherein the control means includes means for sequentially displaying the determined water supply temperature on the display means. 4. The washing machine according to claim 1, wherein the control means comprises means for displaying a warning on the display means when the feed water temperature deviates from a predetermined temperature range. 5. The washing machine according to any one of claims 1 to 4, wherein the control means includes means for issuing an alarm sound by the notification means when the water supply temperature deviates from a predetermined temperature range. 6. The washing machine according to claim 1, wherein the control means includes means for stopping water supply when the water supply temperature deviates from a predetermined temperature range.