JPS6029196A - Controller of washer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Technical Field> The present invention provides water supply amount, water flow strength, and washing L'? 1
'.

11, relates to a control device that automatically controls the distance between v and the like.

<Prior art> In conventional laundry, a person who wants to wash the laundry puts the laundry in a water tank and determines the water supply V1]1, strength of water flow, washing time, etc. based on the amount of washing rir?9I. Depending on my feelings and experience, I decided to change the amount of water supply and washing 11.1L.
-There was a waste of too much incense.

<[Target 1>] Therefore, the present invention weighs the amount of laundry to the whitest JIJ,
Automatically controls the amount of water supplied, the strength of the water flow, etc., and eliminates waste and failures caused by washing. The objective is to provide an efficient laundry-like control device 1.

<Example> Hereinafter, an embodiment of the present invention will be explained based on the drawings.

First, to explain the first embodiment, the control device controls the motor's O.
A motor control means for controlling N and OFF, a detection means for detecting the back electromotive force generated in the motor windings when the motor is turned off, and a detection means for determining the size of the load applied to the motor from the back electromotive force, and controlling the water supply. The apparatus is equipped with water control means for controlling the amount, strength, etc. of water 't'At.

And, 7fS] Figure (n) is intended to be controlled by the present invention [
A graph showing the relationship between the number of rotations N of the washing motor and the time 1 is shown below. Then the rotation speed is
For example, draw a curve like (117). At this time I0-
When the load on the motor is changed using 11 as one stroke, the curve changes as shown in (A) when the load is thick and (C) when it is small. Figure 1 (IJ) shows the rotation speed at 11 o'clock on the vertical axis. j1 load can be detected by detecting the load amount +117 a certain predetermined time after turning on the motor. Conventionally, a tachometer generator or the like has been used as a means for detecting the winding speed and the number of revolutions, but the present invention uses a detection stage that detects the back electromotive force generated in the windings at 1 hour when the motor rotates. has been established.

Next, this detection means will be explained. FIG. 2 is a block diagram of the detection means and motor control means.

In 1, 1.2 is the 8 wires of the motor, 3 is the running capacitor, 4 and 5 are the drive parts for each rotation direction of the motor,
The motor is operated by a drive circuit 11 which is the first stage of motor control via the output of the controller 10.

The drive circuit 11 consists of a pair of relays, each of whose contacts are the drive units 4 and 5. Note that it is also possible to set a triac gate circuit in this drive circuit 11 and configure the drive sections 4 and 5 from triacs. The drive units 4 and 5 are both OFF when the motor is OFF, and when the motor is rotating, a force (-) is applied in the direction of 1. Voltage is also applied to a pair of sub-domains 7 connected in antiparallel to the resistor 6 when the motor is turned on, but these serve to detect signals from the windings when the motor is turned off.

In other words, when the motor is turned on, there is a gap between A and H in the figure.
When \° is applied or the motor is turned off, an electromotive force is applied to the winding 1 due to the rotation of the rotor of the motor. This situation is illustrated by the envelope curve of the AC voltage in Figure 3 (,). At 10 o'clock, the motor is ON, L]l+. 1 or the motor OFF timing, and the rotor's 4j'1
It can be seen that the voltage decreases as the sexual rotation ceases.

In addition, since the voltage between H and 6 during this process is several tens of mV, it is necessary to use JIY river J in the amplifier 1+ device 8, so it is set to h, but when the motor is turned on, A Cl f Since there is an application of \゛ (moon), which is inappropriate for the intensifier 8, it is clipped by diode ``7''.

FIG. 3 (1) shows the state of the voltage envelope between b- and b-. After this is multiplied by amplification II Keyakiryo 8, a waveform simulator circuit is introduced to convert the sine curve into a rectangular wave that can be easily processed by the controller 10. This waveform shaping circuit 9 is a known one such as a Schmitt circuit.

The envelope of the c-B open voltage is shown in FIG. 3(c). Also[
Figures (d) and (e) show 12:00 and 13:00 (
This is a detail of the waveform near I, and it can be seen that the period Tx of the four-way rotation of the rotor becomes longer with time, and that the rotation speed is attenuated. Fig. 4 shows the magnitude of the motor load, and Fig. 5 shows the waveform between c and 3 at 2 o'clock. Period 1'X in the order of Fig. 5 (a), (11), and (to)
changes from small to large, and load changes from small to large.

Therefore, by measuring the cycle of the waveform at part C in FIG. 2 at L2, the magnitude of the load can be determined by 1'. here 2
In this example, we chose a point as close as possible to 1.1 + 1.

Next, the water control means is shown in the block diagram of FIG.
This will be explained step by step using a flowchart showing the 11th action. Controller 10-La 10 is 11 in microcomputer
'4 is constructed, and FIG. 6 shows its configuration and external circuit connections. In the figure, 101 is CI'U, 102 is a program,
ROM for fixed data, 103 is RA for temporary storage memory
M, 104 is a timer, 1()5 is a 110 part (input part and 1 part of Arara 1 puff), and all signals from the outside and signals to the outside pass through this.

Now, the motor is set to 0NL (for example, the drive unit 50N), and after being energized for a certain period of time, the motor is turned off. In step 2 of Figure 7, this fixed time is, for example, 5 seconds.
Select the optimum value depending on the strength of the motor and the inertia of the pulsator, etc. Note that this certain period of time is the period [1→L2] in FIG. 1(a). Next, df in Figure 2! Observe the waveform of the pulse and catch the voltage curve of the pulse, which changes from level to level 20. This is step 3. If you capture Nili, clear the timer and start the timer)
·do. Next, observe the rise of the subsequent pulse.

This is step 5. Catch this and stop the timer. Therefore, the timer data corresponds to the period '1'X of the waveform of section C. Note that the basic clock of the timer is omitted in the figure to indicate whether it is a frequency-divided version of the microcomputer Φ system clock or an appropriate one.

In step °7, this data is RAM 1 F, l
Store in 3. In step 8, this value determines the water supply level,
Washing) 1. Calculate the strength of the water flow during 1.1, suction time, dehydration 11, and ν time. The quick calculation method is based on a general microcomputer method, and uses timer data, namely, motor rotation speed N and water supply level at 12 o'clock, wash) i'', time, rinsing time, spin-drying time, and strength of water flow. An example of the relationship is shown in the table below.

The calculated values of surface water level, wash) v1 time, rinsing time, dehydration time, and strength of water flow are stored in ・RAM] 03,
Automatically performs water supply, washing, rinsing, rinsing, and dehydration according to a predetermined sequence in a program.

Since the operation of this sequence of 70 grams and its natural external circuit is similar to that of various microcomputer-applied washing machines, the details will be omitted, or only a part of the water supply amount control will be explained. Now 1. <To A]
It is assumed that the water supply amount data of +33-L is the middle water level. When the controller 10 enters the water supply sequence, it turns off the motor and ring 1 water valve, and turns on the water supply valve.The water level gauge 12 in FIG. , When the water level reaches that level, a signal or l-bell will be activated in order of one shrub, middle water level, and high water level. In the figure, the water level signal terminals are indicated by L, hi, and l-1, respectively. When the signal from the water level gauge 12 reaches M or l-level, the controller 10 turns off the water supply valve to stop the water supply. Note that various details of the water level gauge are well known, and the present invention does not care about the type thereof, so a description thereof will be omitted.

- As shown in 5C, the amount of laundry to be washed is taken as the load on the motor, and the optimal amount of water supply, washing time, rinsing time, strength of spin 11, and skin water flow are calculated and controlled, so there is no waste. Rational irz without ``i′i dōnō.

Note that the motor load can be detected in various states, and the present invention is effective in any of these states. That is, fill the aquarium with one melon water to the low water level and wash ii'
It is also possible to perform detection by performing ν operation from LO to L1, or to perform dehydration operation without adding water.
It is also possible to detect only one opening and then proceed to the normal operation sequence. The difference between these is simply a change in the number of revolutions, which is the horizontal axis of the table above.

Further, in the north, as a detection means for detecting the magnitude of the load, 1. f) = t 1 distance motor ONL,
Immediately after that, the motor rotation speed is detected (111 is shown, but in the present invention, it is also possible to configure the detection means as in the second embodiment of the following eighth item. In other words, the rotation speed of the motor During inertial rotation, the voltage of the back electromotive force changes as the number of revolutions decreases.Therefore, instead of capturing the period, it is possible to capture the voltage and predict the rotation speed, which in turn allows the load to be detected. This shows a part that replaces the waveform shaping section 5, which is a different part from the block diagram in the figure.The explanation is as follows: This DC voltage is passed through an analog/digital converter 202, and the data is read by the roller 10. This converter 202 may be of a known type. However, regarding the data reading timing L2, immediately after 1 o'clock, the voltage caused by the AC1f, 10\" at the time of ON remains in the half-wave rectifier/integrator circuit 201.
It is necessary to read it a certain time after 1 o'clock. Because this time 11 to L2 remains in the motor characteristics and half-wavelength 1 (current integration circuit 2 () 1), it is necessary to read it after a certain period of time from 1 o'clock.
~1.2 is appropriately selected depending on the characteristics of the motor and the circuit constants of the half-wave rectifier/integrator circuit 2()1.

In addition, the detection means of the present invention includes a first timer that measures the period TX from the rising edge of the voltage pulse waveform of the back electromotive force to the rising edge of the voltage pulse waveform of the back electromotive force as shown in FIG. It is also possible to configure a second timer that measures the time after the motor has opened by 1"a from 1 o'clock when the motor is turned off. This can be understood from the figure.The third embodiment of the present invention will be explained with reference to the flowchart of FIG.
After N, OF FL, start the second timer, and watch the pulse )'Lchi'-rii11! I L, start the first timer, observe the second rising of the pulse), stop the first timer, and save the data with period 'l'×
Compare this with the set value ``a, and if Tx>Ta, stop the second timer, perform data processing based on the data i' a, and set the water supply level, washing time, rinsing time, and dehydration. Set the time and strength of the water flow.

Next, a fourth embodiment of the present invention will be described. Some clothes hold water well and others do not, and it would be inconvenient to determine the time required for washing and dehydration solely from the weight of the clothes. Therefore, the detection means of the first, second, and third embodiments described above are configured to detect the magnitude of the motor load separately when the laundry does not contain water and when the laundry contains water. The fourth embodiment, shown in the schematic flowchart of FIG. 1(), solves this problem. In this example, when the start button for operation is pressed, the motor load is detected by the detection means of the first, second, or third embodiment in a state where the object does not contain water (washing before water supply), and the Calculate parameters and perform predetermined operation. Then, after draining and before spin-drying, the laundry load is detected again in a state where the washed items (washed before spin-drying) contain water and the spin-drying time is calculated. This eliminates the disadvantage of insufficient dehydration of clothes, which are light in weight but tend to contain water, and conversely eliminates wasteful dehydration operations.

<Effect> As is clear from the explanation below, the present invention improves the motor O.
Motor control means for controlling N and OFF, and motor OFF
Equipped with a detection means that detects the back electromotive force generated in the motor windings at times, and a water control means that determines the magnitude of the load applied to the motor from the back electromotive force and controls the amount of water supplied, the strength of the water flow, etc. This is what I did.

Therefore, according to the present invention, an inexpensive and efficient method that automatically measures the amount of laundry and automatically controls the amount of water supplied, the strength of water flow, etc., eliminates waste and failures in washing due to intuition and experience. It has the great effect of providing a good cleaning HH+H (>% control device).

[Brief explanation of the drawing]

Figures 1 to 7 show a first embodiment of the present invention, and Figures 1 to 1 (a) show the number of rotations N of the washing machine motor and the time 1.
．． The graph showing the relationship between
A graph drawn with the rotation speed at 1 o'clock on the vertical axis and the load amount on the horizontal axis, Figure 2 is a configuration diagram of the detection means for detecting the back electromotive force generated in the windings when the motor is OrF, and the motor control means.
Figures 3 (,) to ((・) are graphs for explaining operation, Figure 4 is a graph depicting the magnitude of the motor load, and Figure 5 (,) to (
e) Figure 2 at 2 o'clock (a graph excluding the state of the knee 8 waveform, Figure 6 is a block diagram of the controller section,
Fig. 7 is a 70-chart, Fig. 8 is a block diagram of the main part of the second embodiment of the present invention, Fig. 9 is a 70-chart of the third embodiment of the present invention, and the first (Fig. 11λ of the fourth heaven example
This is an abbreviated flowchart. 1.2: Motor winding, 3: Running capacitor, 4
, 5: Drive unit for each rotation direction of the motor, 6: Resistance, 7
: Diode, 8: Multiplier, 5]: Waveform shaping circuit, 10
：Funt roller, 11：Drive circuit with motor control means. Application l (Sharp Co., Ltd. Agent Tsunehisa Nakamura Figure 2 Figure 7 Figure 80 1Q Entrance

Claims (1)

[Claims] A motor control means for controlling ON and Ohr +r of the motor, a detection means for detecting a back electromotive force generated in the motor winding when the motor is OFF, and determining the magnitude of the load applied to the motor from the back electromotive force, 1.1 The control device of Ainuma Sei has a water control means for controlling the amount of water supplied, the strength of water flow, etc.