JPH06281A - Fully automatic washing machine - Google Patents

Abstract

(57) [Summary] [Purpose] There are two times to detect the cloth load.
By selecting the one with a large cloth load based on the detection results of the times, it is possible to prevent the laundry from being damaged due to the water level being too low. [Structure] The process control means 8 drives the motor 5 for a predetermined time by operating the motor control means 9 before or after water is supplied into the tank 2. Voltage detection means during the subsequent motor off period
The cloth load amount judging means 17 judges the cloth load amount by the output from the electromotive force detecting means consisting of 14 and the counting means 15, and if there is a difference in the cloth load amount, the one having a large cloth load amount is regarded as the cloth load amount. judge. Then, water is supplied up to the water level corresponding to the cloth load.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully automatic washing machine for accurately detecting the load amount of laundry such as clothes put in a washing / dehydrating tank.

[0002]

2. Description of the Related Art A conventional fully automatic washing machine for detecting the load on a laundry washing / dehydrating tub turns on a motor for driving a stirring blade for a predetermined period of time, and then turns off the motor. The electromotive force detection means for detecting the electromotive force generated is provided, and further the determination means for determining the cloth load amount based on the output from the electromotive force detection means is provided to detect the cloth load amount in the tank. The detection of this cloth load was based on the result of one determination.

[0003]

However, in the above-mentioned conventional configuration, the cloth load is determined only before water supply or after water supply. If only before water supply,
When the washing liquid is used twice, the cloth load cannot be detected during the second washing, and only after the water supply, the user knows the cloth load and the water level, and the specified appropriate amount of detergent is used. It took a while to know.

In view of the above problems, the present invention has two times for detecting the cloth load amount, the cloth load amount is judged based on the detection results of the two times, and the detection accuracy is improved. The purpose is not to damage things.

[0005]

According to the present invention, a motor for driving a stirring blade arranged in a tub of a fully automatic washing machine, a motor control means for controlling energization of the motor, and a water supply to the tub. Water supply control means for controlling the water level, water level detection means for detecting the water level in the tub, process control means for controlling the process of the fully automatic washing machine, the motor is turned on for a predetermined time, and then the motor is turned off. , An electromotive force detection means for detecting the motor voltage during the off period and for detecting the electromotive force generated from the motor by counting the number of detected voltage waveforms, a signal from the electromotive force detection means, and a cloth load amount determination standard A cloth load amount judging means for comparing the values and judging the cloth load amount, wherein the cloth load amount judging means drives the motor for a predetermined time by the motor control means before or after water supply into the tank. Of the motor after that The output from the electromotive force detecting means within off period to determine the fabric load, when there is a difference in judgment cloth load, characterized by what lot of the fabric load and fabric load.

[0006]

According to the present invention, the cloth load amount is judged at both times when there is no water in the tank and when the judgment is made, the one having the larger cloth load amount is selected. Therefore, the detection accuracy is improved and the water level is not too low to damage the laundry.

[0007]

1 is a diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a circuit diagram of the control system of FIG. 1, FIG. 3 is an output waveform diagram of the voltage detecting means of FIG. 1, and FIG. 4 is a voltage waveform. FIG. 5 is a diagram showing the relationship between the number and the cloth load amount, and FIG. 5 is a flow chart of the microcomputer for explaining the control operation of FIG.

As shown in FIG. 1, the structure of this embodiment is provided with a tub 2 containing a washing / dehydrating tub (hereinafter referred to as an inner tub) 1, and an agitating blade 3 at the inner bottom of the inner tub 1. It is rotatably arranged. The stirring blade 3 is driven by a motor 5 via a reduction mechanism 4. A drain valve 6 is connected to the bottom of the tank 2, and a water supply valve 7 is arranged above the tank 2. The motor 5, the drainage valve 6 and the water supply valve 7 are each driven via a motor control means 9, a drainage valve control means 10 and a water supply valve control means 11 which are controlled by a process control means 8.

The process control means 8 reads out necessary data from the process storage means 13 based on the setting from the setting means 12 and controls the various control means 9 to 11 for the washing, rinsing and dehydrating processes based on the set contents. Run by.

Further, a voltage detecting means 14 is connected to the motor 5 in order to detect the motor voltage of the motor 5. The output of the counting means 15 for counting the number of voltage waveforms of the voltage detecting means 14 is input to the cloth load amount determining means 17. The voltage detecting means 14 and the counting means 15 are called electromotive force detecting means. The cloth load amount judging means 17 outputs the count signal from the counting means 15 constituting the electromotive force detecting means, the output of the water level detecting means 18 for detecting the water level in the tank 2, and the process controlling means 8 to the motor controlling means 9. The control signal (ON, OFF) output to is also input.

The operation of the fully automatic washing machine having the above structure will be described. First, when the operation is started after setting the process content by the setting device 12, the process control device 8 controls the motor control device 9 to drive the motor 5 for a predetermined time to rotate the stirring blade 3. If the cloth load amount judging means 17 detects the stop of energization of the motor 5 by the control signal from the process controlling means 8 after a predetermined time has passed, the voltage waveform number from the voltage detecting means 14 is counted means.
Count by 15. Then, the cloth load amount judging means 17 compares the value counted by the counting means 15 with the cloth load amount judging reference value, and judges the cloth load amount in the tank 2.

Information of the cloth load amount judged by the cloth load judging means 17 is sent to the process control means 8, and the process control means 8 determines the subsequent washing, rinsing and dehydration processes based on the cloth load amount. Control.

Next, FIG. 2 shows a circuit diagram of the control system of FIG. 1, and 19 is a microcomputer (CPU), which is the process control means 8, the process storage means 13, the counting means 15 and the cloth load shown in FIG. It constitutes the amount determination means 17. A setting switch SW as the setting means 12 and a water level detecting means 18 are connected to the input section of the microcomputer 19. Further, the motor 5 is a bidirectional thyristor 20a, 20b, a drain valve 6
Is connected to the bidirectional thyristor 20c, and the water supply valve 7 is connected to the bidirectional thyristor 20d. An AC voltage is supplied from the AC power supply 21 via these bidirectional thyristors 20a to 20d.

Further, the gates G ₁ , G ₂ , G ₃ , G _{4 of} the bidirectional thyristors 20a to 20d are connected to the output section of the microcomputer 19, and the signal from the output section of the microcomputer 19 causes bidirectionality. It controls the switching operation of the thyristors 20a to 20d. The voltage detecting means 14 for detecting the voltage across the capacitor 22 connected between the windings of the motor 5 sends the detected voltage V _C to the input section of the microcomputer 19.

The voltage detecting means 14 detects the voltage generated across the capacitor 22 of the motor 5 during the energization stop period (OFF) after the motor 5 is energized for a predetermined time (the bidirectional thyristor 20a or 20b is turned on). It is something to detect. This detection voltage V _C has the waveform shown in FIG.

That is, when the cloth load amount is small, it is attenuated within the period T _{1a in} FIG. 3 (a), and when the cloth load amount is large, the period is shorter than T _{1a in} FIG. 3 (a). It decays within the period T _{1b in} FIG. 3 (b). By counting the decay periods T _1a and T _1b as the number of voltage waveforms by the counting means 15, the information shown in FIG. 4 correlated with the cloth load can be obtained.

That is, as can be seen from the number of voltage waveforms (horizontal axis) shown in FIG. 4 and the frequency (vertical axis) showing the count output of the counting means 15, the curves A and B are shown in accordance with the amount of cloth load. , C, D, there is a distribution of the number of voltage waveforms, and the frequency changes. This corresponds to a case (a) where the cloth load amount shown in the waveform of FIG. 3 is small and a case (b) where the cloth load amount is large, and the number of voltage waveforms of FIG.

Here, the control flow of the microcomputer 19 will be described with reference to FIG. When washing is started, in step (hereinafter abbreviated as S) 1, first, stirring is started without water before water supply. Then, in S2, the number of voltage waveforms after the motor is turned off is counted by the voltage detecting means 14 and the counting means 15.
Then, when the stirring is stopped in S3, the cloth load amount I at this time is judged by the cloth load amount judging means 17 in S4.

Next, water supply is started in S5, and water is supplied up to a predetermined water level (S6). Stop water supply in S7 and start stirring
(S8). Here, as in S2, the number of voltage waveforms after the motor is turned off is counted in S9. Then, in S10, the stirring is stopped,
The cloth load II is determined by the number of voltage waveforms in S9 (S1
1).

Next, in S12, the cloth load amount I determined in S4 is compared with the cloth load amount II determined in S11. If I ≧ II, the process proceeds to S13, and the cloth load amount is finally determined to be I. And S14
Then, water is supplied up to the water level corresponding to the cloth load I, and the process proceeds to the next step.

On the other hand, if the cloth load amount is I <II in S12, it is determined that the cloth load amount is II in S15. Then, in S16, water is supplied to the water level corresponding to the cloth load II, and the process proceeds to the next step.

In the above operation, even if laundry is added after the first detection, the amount of added laundry can be dealt with until the second detection. .

[0023]

As described above, in the fully automatic washing machine of the present invention, the process control means drives the motor for a predetermined time by operating the motor control means both before and after water supply to the tub, In the subsequent motor off period, the cloth load amount is judged by the cloth load amount judging means according to the number of voltage waveforms from the electromotive force detecting means, and if the judged cloth load amount is different, the cloth load amount is large. By setting the cloth load amount to twice, the detection accuracy is improved by detecting the cloth load amount twice, and the laundry is not damaged because the water level is too low.

[Brief description of drawings]

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

FIG. 2 is a circuit diagram of a control system shown in FIG.

FIG. 3 is an output waveform diagram of the voltage detection means of FIG.

FIG. 4 is a diagram showing a relationship between the number of voltage waveforms and a cloth load amount.

5 is a flowchart of a microcomputer for explaining the control operation of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Washing / dehydrating tank, 2 ... Tank, 3 ... Stirring blade, 5 ... Motor, 7 ... Water supply valve, 8 ... Process control means, 9 ... Motor control means, 10 ... Drain valve control means, 11 ... Water supply valve control means , 12 ... Setting means, 13 ... Process storing means, 14 ... Voltage detecting means, 15 ... Counting means, 17 ... Cloth load amount judging means,
18 ... Water level detection means, 19 ... Microcomputer.

Claims (1)

[Claims] 1. A motor for driving a stirring blade arranged in a tub of a fully automatic washing machine, a motor control means for controlling energization of the motor, and a water supply control means for controlling water supply to the tub. Water level detection means for detecting the water level in the tub, process control means for controlling the process of the fully automatic washing machine, the motor is turned on for a predetermined time, and then the motor is turned off, and the motor voltage during the off period is set. The signal from this electromotive force detection means is compared with the cloth load amount judgment reference value to detect the electromotive force generated from the motor by detecting the number of detected voltage waveforms, and the cloth load amount is compared. And a cloth load amount judging means for judging that the cloth load amount judging means drives the motor for a predetermined time by the motor control means before or after water is supplied into the tank, and then turns off the motor. Detecting the electromotive force within the period A fully automatic washing machine characterized in that the cloth load amount is judged by the output from the means, and if there is a difference in the judged cloth load amount, the cloth load amount having the larger cloth load amount is set.