Fluid entrapment detection

a technology of fluid entrapment and detection field, which is applied in the field of washing machines, can solve the problems of washing machine malfunction, load size and/or load distribution in the wash basket is magnified, and the washing basket is not easy to clean

Inactive Publication Date: 2008-07-31
FISHER & PAYKEL APPLIANCES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0024]This invention may also be said broadly to comprise in the parts, elements and features referred to or indicated in the specification of the application, individually or collectively, and any or all combinations of any two or more of sa

Problems solved by technology

As an example, an imbalance in the washing basket due to the load size and/or load distribution within the wash basket is magnifi

Method used

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  • Fluid entrapment detection
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  • Fluid entrapment detection

Examples

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Embodiment Construction

Overview

[0033]The present invention will be described primarily with reference to a laundry washing machine. It has been found that if water is trapped inside a large waterproof item for example that surrounds or encloses around a number of other clothes items in the wash basket being cleaned, it is possible for the machine can reach a high spin speed, for example over 600 rpm, before the wash basket is forced violently out of balance. This type of situation is caused by water being trapped by the waterproof item and can result in the washing machine being damaged.

[0034]FIG. 1 shows in schematic form a washing machine 10 adapted to modify its operation based on the type or nature of a wash load 14 in the wash / spin basket 13. The washing machine 10 comprises an outer housing 11, an internal tub 12 and a spin basket 13 within the inner tub 12. The spin basket 13 is adapted to hold and wash items comprising the wash load 14. The washing machine 10 includes a motor 15 for an agitator 19...

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Abstract

A washing machine includes a cabinet, a wash tub supported within the cabinet, a spin basket for holding a wash load, the spin basket rotatable in the wash tub by a motor, and a controller for driving the motor to rotate the spin basket. The controller is adapted to detect water entrapment within a wash load in a spin basket of a washing machine by measuring a first parameter indicative of the rotational inertia of the spin basket when accelerated to a first spin speed, controlling the spin basket to dewater a wash load in the spin basket, measuring a second parameter indicative of the rotational inertia of the spin basket at the first speed, comparing the first and second parameters, and detecting whether there is water entrapped in the wash load based on the comparison between the first and second parameters.

Description

CROSS-REFERENCE AND INCORPORATION BY REFERENCE[0001]This application is a non-provisional of U.S. Provisional Patent Application Ser. No. 60 / 887,390, entitled “Fluid Entrapment Detection”, filed Jan. 31, 2007. U.S. Patent Provisional Patent Application Ser. No. 60 / 887,390 is hereby incorporated by reference.FIELD OF INVENTION[0002]The present invention relates to washing machine, and in particular to a control system used to modify the operation of the washing machine based on certain characteristics of the wash load.BACKGROUND TO THE INVENTION[0003]The typical washing machine has a washing basket, tub or receptacle that holds laundry for washing. The washing basket is coupled to a motor that is used to rotate the washing basket at various speeds during various operating cycles of the washing machine. A controller is used to control the operation of the motor depending on the various cycles of the washing cycle. Similarly, the controller receives feedback from a number of sensors an...

Claims

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Application Information

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IPC IPC(8): D06F37/00D06F23/00
CPCD06F37/145D06F2202/06D06F39/003D06F34/18D06F2103/04D06F2103/18D06F2103/38D06F2105/48
Inventor DARBY, ADAM JOHNCHEUNG, MAN KIT
Owner FISHER & PAYKEL APPLIANCES LTD
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