JPH01164394A - Control apparatus of washing machine - Google Patents

Abstract

PURPOSE: To perform exact water level detection under a stabilized water level when a control means finds that water level setting has been changed during stirring by detecting the water level after stopping stirring operation temporarily under the control of a motor control means. CONSTITUTION: A motor control means 4 is provided for forcedly stopping the rotation of a motor for a fixed period during stirring and a switching device 5c drives a feed valve 8. When the level setting of the water level is changed by a water level setting switching means 2 during the stirring operation of washing or rinsing, the rotation of the motor is forcedly stopped for a fixed period by the motor control means 4, and the water level is detected by a water level detecting means 3. When the detected current water level is lower than the water level set by the water level setting switching means 2, water is supplied by driving the feed valve 8. Since the rotation of the motor is stopped for a fixed period after the water level setting change during the stirring operation, a water level fluctuation is reduced and the changed water level can exactly be detected under the stabilized 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,
It controls a series of sequential operations such as rinsing, and the water level setting switching means 2 is composed of a switch that can set the water level. The water level detection means 3 detects the water level in the washing tub. Further, the AC power source 9 and the switching devices 5a and 5b are connected in series to supply electric power to the motor 7 that performs the stirring operation. The switching devices @6a and 5b are semiconductor switching devices such as bidirectional SIRISK, which rotate the motor 7 in the normal direction.

The reverse rotation is controlled based on a control signal from the control means 1. 6 is a phase advancing capacitor.

When the water level setting is switched by the water level setting switching means 2 while the motor 7 is being rotated by the control means 1 during the agitation operation for washing and rinsing, the control means 1 is switched immediately after the switching. The water level was detected by the water level detection means 3.

Problems to be Solved by the Invention In such a conventional configuration, water level detection is performed when the water level fluctuates greatly, such as during stirring while the motor is rotating, so the water level cannot be detected accurately. There was a problem.

The present invention is intended to solve these problems, and aims to accurately detect the water level even when the water level setting is changed during stirring.

Means to Solve the Problem In order to solve this problem, the present invention provides a method in which, if the control means determines that the water level setting has been changed during stirring, the stirring operation is stopped for a certain period of time under the control of the motor control means. , which is designed to detect the water level.

With this configuration, when the water level setting during stirring is changed, by stopping the stirring operation for a certain period of time and detecting the water level, the water level can be detected accurately with a stable water level for the set water level that has been changed. It becomes possible.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2. Note that in the drawings, the same parts as in the conventional example are given the same numbers and their explanations are 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 6C is for driving the water supply valve 8.

When the water level setting is switched by the water level setting switching means 2 during the stirring operation for washing and rinsing, the motor control means 4 forcibly stops the rotation of the motor for a certain period of time (2 seconds in this embodiment). After that, the water level is detected by the water level detection means 3. If the detected current water level is lower than the water level set by the water level setting switching means 2, the water supply valve 8 is driven to supply water.

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

In step 10, the microcomputer 1 determines whether or not the water level setting has been changed. If it has been changed, the microcomputer 1 determines whether or not the stirring operation is in progress in step 11. If the stirring operation is in progress, in step 12, the microcomputer 1 Stop stirring operation. Then, in step 13, it is determined whether a certain period of time has elapsed after the agitation was stopped, and if the certain period of time has elapsed, in step 14, the water level in the washing tub is detected by the water level detecting means 3. Also step 1
When it is determined in step 5 that the stirring operation is stopped, the water level is similarly detected after a certain period of time.

Effects of the Invention As described above, according to the present invention, after switching the water level setting during stirring operation, the rotation of the motor is stopped for a certain period of time, thereby reducing the change in water level, and
Accurate water level detection can now be performed under a stable water level, and it is therefore possible to prevent malfunctions such as erroneously determining the water level and erroneously replenishing water.

[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 setting switching means, 3... Water level detection means, 4... Motor control means, 51L 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
1 Cause 2nd Flash Figure 3

Claims (1)

[Claims] A motor control means for controlling the stirring operation during washing and rinsing, a water level detection means for detecting the water level in the washing tub, a water level setting switching means for setting the water level, and a signal from the water level detection means and the water level setting switching means. and a control means for controlling the water level by inputting an input signal, and when the water level setting is switched by the water level setting switching means during the stirring operation of washing or rinsing of the control means, the stirring operation is controlled for a certain period of time by the motor control means. A washing machine control device that detects a water level in a washing tub using the water level detection means after the washing machine has stopped.