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Method for removing foam from the washing container of a drum-type washing machine

A technology for a drum washing machine and a washing container, which is applied to the control device of the washing machine, other washing machines, washing devices, etc., can solve the problem that the sensor is not always available.

Inactive Publication Date: 2011-06-08
BOSCH SIEMENS HAUSGERATE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of foam recognition, although somewhat reliable, requires a special light sensor that is not always available for other tasks

Method used

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  • Method for removing foam from the washing container of a drum-type washing machine
  • Method for removing foam from the washing container of a drum-type washing machine
  • Method for removing foam from the washing container of a drum-type washing machine

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Experimental program
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Embodiment Construction

[0016] figure 1 Indicates section A before the start of the centrifugation program, ie the loosening phase. During the loosening phase, the washing drum is driven intermittently at the washing speed. This can have a change in direction of rotation. Speed ​​peak N represented by a thin line 1 to N 17 Indicates intermittent drive of the laundry drum. Fluctuations in the liquid level in the washing container (thick line P) are relatively small during this phase. The withdrawal of liquid from the washing vessel after the loosening phase A causes the thick line P to drop very steeply almost continuously to 0. After the constant liquid level drop rate is determined in section B, the rotation speed of the washing drum is increased to the preselected centrifugal speed N S . A greater quantity of liquid is thus centrifuged from the laundry per unit of time than the pump can handle at the time. The liquid level in the washing container therefore rises slightly again in section D...

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Abstract

The invention relates to a process for removing foam in a lye container as a result of a program step, provided for dehydrating the lye container, with a lye discharge system arranged on the floor of the lye container with a lye pump and with a sensor for determining the level of the liquid in the lye container, whereof the sensor signal p is recorded during operation of the lye pump. According to the inventive method, the foam is detected in a detection range in such a way that through determining a change rate (Deltap / Deltat) of a curve (p / t) of the sensor signal, and through determining a component of the curve (p / t) of the sensor signal, the component is a specific change of the change rate (Deltap / Deltat), and through comparing the successive level gradients of (Deltap1 / Deltat1 to Deltap2 / Deltat2,..., Deltapn-1 / Deltatn-1 to Deltapn / Deltatn; wherein a foam-treating measure that is adapted to the type of the component is initiated if the component is present.

Description

technical field [0001] The invention relates to a method for removing foam from a washing container of an electrically controlled front-loading washing machine by a program step for draining the washing container, the washing machine having a detergent container drainage system arranged at the bottom of the washing container , the system has a pump and a sensor for determining the level of liquid in the washing container, the signal of which sensor is recorded while the pump is working. Background technique [0002] Such a method is known from DE 198 46 248 A1, in which foam in the discharge system is detected by a sensor based on a photoelectric sensor when the detergent solution pump is in operation. These foams are broken by unspecified measures. Although this method of foam detection is reliable to a certain extent, it requires a special light sensor which is not always available for other tasks. [0003] A similar method is known from EP 0 278 239 A1. where excess su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06F39/06D06F39/08
CPCD06F39/087D06F2204/086D06F39/06D06F33/34D06F34/08D06F34/24D06F35/005D06F2103/18D06F2105/04D06F2105/48D06F2103/20
Inventor G·奇热夫斯基I·舒尔策
Owner BOSCH SIEMENS HAUSGERATE GMBH
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