JPH01175891A - Control device for washing machine - Google Patents

Abstract

PURPOSE:To enable a level of water to be accurately detected under the stable level of water decreasing a change of the water level especially in its minimum or small level by forcedly stopping, during stirring, the rotation of a motor which performs the stirring. CONSTITUTION:A motor control means 4 forcedly stops rotation of a motor for the fixed time during stirring, and a switching unit 5c drives a supply water valve 8. During stirring of washing and rinsing, the motor control means 4 forcedly stops the motor in its rotation for the fixed time, and a water level detecting means detects a level of water, after it is stabilized, a discriminating means 3 discriminates the water level for whether or not is reaches the predetermined level, when the decision is not more than the predetermined water level, water is supplied to the predetermined water level by driving the supply water valve 8.

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. Further, the AC power source 9 and the switching devices 5a and 6b are connected in series to supply electric power to the motor 7 that performs the stirring operation. The switching devices sa and sb are semiconductor switching devices such as bidirectional thyristors, and control forward and reverse rotation of the motor 7. 6
is a phase advance capacitor.

During agitation for washing and rinsing, while the motor 7 is being rotated by the control means 1, the water level is detected by the water level detection means 2 at any time, and the determination means 3 determines whether the water level has reached a predetermined level. It was intended to be carried out.

Problems to be Solved by the Invention In such a conventional configuration, there is a problem in that the water level changes greatly due to the rotation of the pulsator during stirring, especially at extremely low or small water levels, making it impossible to accurately detect the water level.

The present invention is intended to solve these problems, and aims to accurately detect the water level by stopping the rotation of the motor for a certain period of time during stirring.

Means for Solving the Problem In order to solve this problem, the present invention forcibly stops the rotation of the motor for a certain period of time during stirring by controlling the motor control means, and detects the water level at that point. This is what I did.

Function: With this configuration, by forcibly stopping the rotation of the motor for a certain period of time during agitation, water level changes, especially at very small or small water levels, are reduced, and water level detection can be performed based on a stable water level. Become.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. In the figure, parts that are the same as those in the conventional example are given the same numbers and explanations will be omitted. The motor control means 4 is for forcibly stopping the rotation of the motor for a certain period of time during stirring, and the switching device 5C is for driving the water supply valve 8.

During agitation during washing and rinsing, the motor control means 4
The rotation of the motor is forcibly stopped for a certain period of time, the water level is detected by the water level detecting means 2, and after the water level becomes stable, the determining means 3 determines whether the water level has reached a predetermined level. If it is below the water level, the water supply valve 8 is driven to supply water up to a predetermined water level.

Next, the operation of this embodiment will be explained with reference to a flowchart. FIG. 2 shows a main part of a flowchart under the control of the control means 1 composed of a microcomputer.

In step 10, the control means 1 determines whether washing or rinsing is being agitated, and if agitation is in progress, the control means 1 determines whether a certain period of time has elapsed after the start of agitation using the Stellaf "11,"
If a certain period of time has elapsed, the motor control means 4 in the stelae 12 forcibly stops the rotation of the motor, and the water level detection means 2 in the stelae 13 detects the water level.

Then, in the stellar stage 14, the control means 1 determines whether the water level fluctuation has become small, and when the water level fluctuation has become small, in step 16, the determining means 3 determines whether the water level is below a predetermined set water level. If it is determined that there is water, water is supplied to the stele pen 16 up to a predetermined water level.

Effects of the Invention As described above, according to the present invention, by forcibly stopping the rotation of the stirring motor during stirring, water level changes,
In particular, changes in water level are reduced when the water level is extremely small or small, and water level detection can be performed accurately at a stable water level.

[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. 1... Control means, 2... Water level detection means, 3... Discrimination means, 4... Motor control means, 6... 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 person7-
Motor diagram 3

Claims (2)

[Claims] (1) A motor control means that controls the rotation of the motor that performs stirring during washing and rinsing, a water level detection means that detects the water level in the washing tub, and a water level detected by the water level detection means that is below a predetermined water level. During washing and rinsing, the motor control means forcibly stops the rotation of the motor for a certain period of time, the water level is detected by the water level detection means, and the water level is detected by the water level detection means. A washing machine control device characterized by determining whether or not a washing machine has reached a certain level. (2) The washing machine control device according to claim 1, wherein the determination means performs the determination at fixed time intervals.