JPH01148298A - Controller of washing machine - Google Patents

Abstract

PURPOSE: To precisely detect a water level even in the middle of agitating such as washing and rinsing by providing a water flow inversion suspension detecting means to detect a suspending state at the time of inverting a water flow during agitation to detect the water level in the detected suspending period. CONSTITUTION: Microcomputer 1 judges whether a washing machine is in the middle of agitation of washing or rinsing or not to judge whether or not a fixed time has passed since starting agitation if being in the middle of agitation and to judge whether or not the washing machine is in a suspending state in the inversion of water flow by the water flow inversion suspension detecting means 4 when the fixed time has passed to detect the water level by a water level detecting means 2 if being in the suspending state. The water level can precisely be detected especially in a state where variation of the water level is small at the time of the water level of an extremely small or small amount, namely under a stable water level. The microcomputer 1 judges them from whether or not the variation of the water level becomes small and when the variation of the water level becomes small, judges from whether or not the water level is not higher than a prescribed set water level by a discriminating means. Then at the time of judging the water level is not higher than the prescribed water level, the microcomputer 1 supplies water to the prescribed set water level.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a washing machine control device capable of detecting the water level in a washing tub.

2. Description of the Related Art Conventionally, a control device for a washing machine of this type has a configuration as shown in FIG. In FIG. 3, the control means 1 wash,
A series of sequential rinsing operations are controlled, and the water level detection means 2 detects the water level in the washing tub. The determining means 3 determines whether the water level detected by the water level detecting means 2 is below a predetermined water level. Also, the AC power supply 9 and the switching devices 5a and 5b are connected in series, and the motor 7
to supply power. The switching devices sa and sb are semiconductor switching devices such as bidirectional thyristors, and control forward and reverse rotation of the motor 7 to rotate the stirring blades at the bottom of the washing tub in the forward and reverse directions. 6 is a phase advancing capacitor.

During washing and rinsing agitation, the control means 1 controls the motor 7.
Rotate. At this time, the water level is detected by the water level detecting means 2 at any time, and the determining means 3 determines whether the water level has reached a predetermined level.

Problems to be Solved by the Invention In such a conventional configuration, when the stirring blade is rotating during washing or rinsing, the water level changes greatly, especially at extremely small or small water levels, making it difficult to accurately detect the water level. The problem was that I couldn't do it.

The present invention is intended to solve these problems.

The purpose is to accurately detect the water level even during agitation such as washing and rinsing.

Means for Solving the Problem In order to solve this problem, the present invention provides a water flow reversal pause detection means, detects the pause state when the water flow is reversed during stirring, and detects the water level during the detected pause period. It was designed to do so.

Effect: With this configuration, the water level is detected during the pause period when the water flow is reversed, so that changes in the water level, especially when the water level is extremely small or small, are small.

In other words, the water level can be detected based on a stable water level.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. In the drawings, parts that are the same as those in the conventional example are given the same numbers and their explanations will be omitted. The water flow reversal stop detection means 4 is
The switching device 6C is used to detect the pause state of water flow reversal during stirring, that is, the stopped state of the motor 7, and the switching device 6C is used to drive the water supply valve 8.

During agitation for washing and rinsing, the water flow reversal/pause detection means 4 detects a rest state at the time of water flow reversal, the water level detection means 2 detects the water level during the detected rest period, and the discrimination means 3 detects a predetermined water level. It is determined whether the water level has reached the predetermined water level, and if the water level is below the predetermined water level, water is replenished to the predetermined water level.

Next, the operation of this embodiment will be explained using a flowchart. FIG. 2 shows a main part of a flowchart controlled by the control means 1 using a microcomputer.

In step 1o, the microcomputer 1 determines whether washing or rinsing is being stirred, and if stirring is in progress, it is determined in step 11 whether or not a certain period of time has elapsed since the start of stirring, and if a certain period of time has elapsed. In step 12, the water flow reversal/pause detection means 4 determines whether the water flow is in a rest state during reversal, and if the water flow is in a rest state, the water level detection means 2 detects the water level in step 13. and,
In step 14, the microcomputer 1 determines whether the water level fluctuation has become small, and when the water level fluctuation has become small, in step 16, the determination means 3 determines whether the water level is below a predetermined set water level, and if the water level is below the predetermined water level. When I decided that.

In step 16, water is supplied to a predetermined set water level.

Effects of the Invention As described above, according to the present invention, by detecting the water level during the pause period when the water flow is reversed, changes in the water level, especially when the water level is extremely small or a small amount, are small, that is, when the water level is stable. The effect is that the water level can be detected accurately.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the main parts of a washing machine control device according to an embodiment of the present invention, FIG. 2 is a flowchart of the main parts of the same control device, and FIG. 3 is a main part of a conventional washing machine control device. It is a block diagram. DESCRIPTION OF SYMBOLS 1... Control means, 2... Water level detection means, 3... Discrimination means, 4... Water flow reversal stop detection means, 6a to 6C... ... Switching device, 6 ... Phase advance capacitor, 7 ... Motor, 8 ... Water supply valve, 9 ... AC power supply. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
figure

Claims (2)

[Claims] (1) A water flow reversal/pause detection means for detecting a pause state of water flow reversal during washing or rinsing, a water level detection means for detecting the water level in the washing tub, and the water level detected by the water level detection means is below a predetermined water level. and a discriminating means for determining whether the water flow is in a state of inactivity during washing or rinsing, and the discriminating means detects a pause state when the water flow is reversed by the water flow reversal pause detection means during washing or rinsing, and detects a pause state when the water flow is reversed by the water level detection means during the detected pause period. A washing machine control device that detects water level and determines whether a predetermined water level has been reached. (2) A washing machine control device according to claim 1, wherein the series of operations described above is performed at regular intervals.