JPH03146096A - Controller of washing machine - Google Patents

Abstract

PURPOSE:To execute rinse without fail even when a wash is executed by liquid- state detergent by deciding whether a detergent is the liquid-state detergent or not, according to the output value of a muddy degree detector after the lapse of fixed time after the wash is started, and deciding the operation of the rinse by a cloth amount detector. CONSTITUTION:After the wash is started, the change rate of an output voltage from the muddy degree detector is small in the case of the liquid-state detergent and the change rate is large in the case of the powdery detergent. By utilizing this characteristic, a microcomputer 24 discriminates the liquid-state detergent when the output voltage of the muddy degree detector 20 is more than a prescribed value after the lapse of the fixed time after the wash is started. Next, at the time of the rinse, the output voltage of the muddy degree detector 20 is not almost changed in the case of the liquid-state detergent. Accordingly, when the liquid-state detergent is judged at the time of the wash, the rinse operation is executed corresponding to the amount of the cloth decided by a cloth amount detector 21 before the wash is started.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a washing machine control device that controls rinsing by detecting the turbidity of a liquid in a washing tub.

BACKGROUND OF THE INVENTION Conventionally, this type of washing machine control device has been disclosed, for example, in Japanese Patent Application Laid-Open No.
- As shown in Publication No. 30875, a system that detects the transparency of the rinsing water in the washing tub after a certain period of time after the start of the rinsing process, generates a rinsing completion signal, etc. according to the transparency, and controls the rinsing process. is common.

Problems to be Solved by the Invention However, with such conventional methods, when using liquid detergent, the change in water clarity during rinsing is very small compared to powder detergent, so rinsing cannot be performed successfully. The problem was that it was not possible to determine whether the

Therefore, an object of the present invention is to ensure that rinsing can be performed even when washing with liquid detergent is performed.

Means for Solving the Problems In order to achieve the above object, the present invention provides a turbidity detector for detecting changes in turbidity of washing water, a cloth amount detector for detecting the amount of cloth in a washing tub, and control means for controlling water supply, washing, and rinsing operations, and the control means determines that the liquid detergent is a liquid detergent if the output value of the turbidity detector after a certain period of time from the start of washing is a certain value or more, and starts the rinsing operation. is performed in accordance with the amount of cloth determined by the amount of cloth detector.

Function: The washing machine control device of the present invention has the above-mentioned configuration, and is configured to determine whether the detergent is liquid detergent or not, and if the detergent is liquid detergent, the rinsing operation is controlled based on the amount of cloth. Therefore, stable rinsing can be performed.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings. FIG. 1 is a block diagram of a control circuit for a fully automatic washing machine according to the present invention. In the figure, reference numeral 1 denotes an AC power supply, which applies an AC voltage to the control device 2. The control device 2 has three signals: a turbidity detector 2o that detects a change in turbidity of washing water, a cloth amount detector 21 that detects the amount of cloth in the washing tub, and a water level detector 22 that detects the water level in the washing tub. and motor 3
゜Water supply valve 4. It is comprised of a microcomputer 24 which is a control means for controlling water supply, washing, and rinsing operations using a switching device 23 to control the load on the drain valve 5 . 6 is a capacitor for advancing the phase of the motor 3. Here, the cloth amount detector 21 determines the cloth amount by the number of pulses of the phase advance capacitor e corresponding to the inertial rotation speed of the stirring blade when the motor 3 is off.If the number of pulses is small, the cloth amount is If the parnu number is large, it is determined that the amount of cloth is small, and this determination is made before the start of washing.

Further, the turbidity detection 9% 20 is composed of a light emitting element and a light receiving element, and a specific control circuit thereof is shown in FIG. The microcomputer 24 is a pulse 1III control circuit (PW
M circuit) and A/D conversion circuit, outputs the PWM signal to the current control circuit 26, and outputs the PWM signal to the turbidity detector 200 light emitting element 2o.
Drive 1. The current control circuit 25 includes a D/A conversion circuit 261 that integrates a PWM signal and converts it into an analog signal, a transistor 252$'' and its emitter resistor 263, and controls the current of the light emitting element 201 connected to the collector of the transistor 262. The terminal voltage of the load resistor 27 of the light receiving element 202 is applied to the A/D conversion input terminal of the microcomputer 24, and a change in voltage is detected.The light emitting element 201 of the turbidity detector 20 is also pulse-driven. In order to
W) is periodically turned on and off to switch the transistor 28. 28 is a memory means, which sets the PW so that the output voltage of the turbidity detection i20 becomes a predetermined value when water is supplied for rinsing.
It adjusts the M signal and stores this PWM signal.

FIG. 3 shows the output voltage V of the light receiving element 202 during the washing, rinsing, and dehydration processes when the light emitting output of the light emitting element 201 of the turbidity detector 200 is adjusted to a predetermined value during rinsing water supply as described above. It shows change. As shown in FIG. 4, after the start of washing, the output voltage V decreases over time, and the manner in which this decrease occurs is different between powder detergent and liquid detergent, as shown in FIG. That is, after the start of washing, the rate of change in the output voltage is small when using liquid detergent, and the rate of change when using powder detergent is large. Therefore, using this characteristic, the microcomputer 24 detects the turbidity detector 20 after a certain period of time from the start of washing.
If the output voltage is equal to or higher than a predetermined value, it can be determined that the detergent is a liquid detergent. For example, as shown in Fig. 5, this setting value is based on the change characteristics of the output voltage when washing heavily soiled items using liquid detergent, and when using powder detergent.
Based on the change characteristics of the output voltage when washing lightly soiled items, if the rate of change in the output voltage is 60% or more 2 minutes after the start of washing, it can be determined that the detergent is a liquid detergent.

Next, during rinsing, the output voltage of the turbidity detector 20 is controlled by the change JV in the output voltage from the time of water supply, as shown in Figure 3, and this JV is small. , it is considered that sufficient rinsing has been completed. However, in the case of liquid detergent, this change in output voltage JV hardly changes. Therefore, when it is determined that liquid detergent is used during washing, the rinsing operation is performed according to the amount of cloth determined by the cloth amount detector 21 shown in FIG. 1 before the start of washing.

As a result, even with liquid detergent, stable rinsing can be performed without rinsing being completed insufficiently.

Effects of the Invention As described above, the present invention determines that it is a liquid detergent if the output value of the turbidity detector after a certain period of time from the start of washing is above a certain value, and the rinsing operation is determined by the cloth amount detector. Since the rinsing is performed according to the amount of cloth applied, stable rinsing control can be performed.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a control circuit for a fully automatic washing machine according to the present invention, Fig. 2 is a block diagram showing an example of a specific control circuit for a turbidity detector according to the present invention, and Fig. 3 is a block diagram of a control circuit for a fully automatic washing machine according to the present invention. Wash and rinse the light receiving element of the vessel. FIG. 4 is a graph showing signal changes during the dehydration process. FIG. 5 is a graph showing signal changes after the start of washing due to the difference between liquid detergent and powder detergent. 20...Turbidity detector, 21... Cloth amount detector, 24... Control means (microcomputer).

Claims (1)

[Claims] A turbidity detector consisting of a light-emitting element and a light-receiving element for detecting changes in the turbidity of washing water, a cloth amount detector for detecting the amount of cloth in the washing tub, and a control means for controlling water supply, washing, and rinsing operations. The control means determines that the liquid detergent is used if the output value of the turbidity detector after a predetermined time after the start of washing is a predetermined value or more, and the rinsing operation is performed based on the amount of cloth determined by the amount of cloth detector. A washing machine control device that operates according to the conditions.