Drum-type washing machine

Abstract

The present invention relates to a drum-type washing machine. The invention settles a problem of ensuring enough washing capacity even at the states when a user performs secondary washing or immersion washing, etc. When a washing operation is started at a no-water state of a water-containing barrel (31), which is detected by a water level sensor (45), the washing operation is performed in the washing process according to the dirty degree determination result obtained from an optical sensor (72). When the washing operation is started at a water existing state, which is detected by the water level sensor, the dirty degree determination result which is obtained according to the optical sensor in the washing process is fixed to a stage with most dirt. Therefore, even when the secondary washing is performed or the washing operation is started at the water existing state in the water-containing barrel for immersion washing, sufficient washing capacity is ensured similarly with the normal operation when the washing is started from the no-water state of the water-containing barrel.

Description

technical field [0001] The invention relates to a washing machine which controls the washing operation correspondingly according to the state of the washing liquid. Background technique [0002] In the existing drum-type washing machine, as a means for the washing machine to detect the state of the washing liquid, it is generally considered to install a dirt sensor such as a turbidity sensor to detect the state of the washing liquid near the bottom of the outer tub to detect the state of the state of the washing liquid such as the degree of dirtiness. , and correspondingly extend the washing time according to the degree of dirt, so as to implement the most appropriate control of the washing process that always conforms to the degree of dirt. Bulletin No. 4-35684. [0003] In addition, as a detection method of the degree of dirt, it can also be considered to perform detection by comparing the degree of dirt of the washing water in the water intake process or the initial stag...

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Problems solved by technology

[0004] However, the technology disclosed in the above-mentioned Japanese Laid-Open Gazette has the following problems: For example, if the user cuts off the power supply to stop the washing machine after the washing process is finished and before the drainage starts, and then takes out the washed laundry from the washing tub, Then put the other laundry into the washing bucket, turn on the power again, and use the same washing liquid for the second washing, that is, in the case of 2 washings, because the washing liquid has become dirty during the first washing operation. Therefore, in the second wash, the difference between the degree of soiling of the washing liquid at the beginning of the washing process and the degree of soiling of the washing liquid after a certain period of time after the start of the washing process is relatively small, and the machine cannot accurately detect the degree of soiling , so cleaning performance cannot be ensured

[0005] In addition, when the laundry is particularly dirty, if the user cuts off the power supply to stop the washing machine after the washing process ends and before the drainage starts, and leaves it intact for a few hours, then turn on the power supply again for washing operation, that is, In the case of immersion washing, since the dirt is eluted under the emulsification of the detergent during the soaking process, the difference between the degree of soiling of the washing liquid at the beginning of the laundry process and the degree of soiling of the washing liquid after a certain period of time after the start of the washing process is relatively small. Smaller, the machine cannot accurately detect the degree of soiling, so cleaning performance cannot be guaranteed

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