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Method for sensing amount of clothes in washing machine

Inactive Publication Date: 2005-02-10
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention has been made in view of the above mentioned problems involved with the related art, and an object of the invention is to provide a clothes amount sensing method in a washing machine which is capable of reducing clothes amount sensing errors caused by frictional forces, thereby achieving an enhancement in accuracy and reliability.

Problems solved by technology

In accordance with the above mentioned conventional clothes amount sensing method, however, the calculated clothes amount value may have an error caused by friction generated during the rotation of the wash tub 20, for example, friction of the bearing 34, friction generated between the door glass 6 and the clothes m, etc.

Method used

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  • Method for sensing amount of clothes in washing machine
  • Method for sensing amount of clothes in washing machine
  • Method for sensing amount of clothes in washing machine

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

In accordance with the clothes amount sensing method according to the present invention, as shown in FIGS. 5 and 6, the motor 30 is first started up, and is then accelerated (S101). When the RPM of the motor 30 reaches a first predetermined RPM rpm0, for example, 50 rpm, the motor 30 is maintained at the first predetermined RPM rpm0 (S102).

The start-up, acceleration, and maintenance at the first predetermined RPM rpmo of the motor 30, as described above, are adapted to eliminate the influence of a static frictional force, generated upon an operation of sensing a clothes amount, on the sensing of the clothes amount. It is preferred that the first predetermined RPM rpmo, correspond to an RPM sufficiently low to cause clothes m, to be washed, to come into constant contact with an inner peripheral surface of the wash tub 10.

Following the start-up, acceleration, and maintenance at the first predetermined RPM rpm0, the motor 30 is driven in a mode for determining the amount of the clot...

second embodiment

In accordance with the clothes amount sensing method according to the present invention, as shown in FIGS. 7 and 8, the motor 30 is first started up, and is then accelerated (S201). When the RPM of the motor 30 reaches a first predetermined RPM rpm0, for example, 50 rpm, the motor 30 is maintained at the first predetermined RPM rpm0 (S202).

The start-up, acceleration, and maintenance at the first predetermined RPM rpm0 of the motor 30, as described above, are adapted to eliminate the influence of a static frictional force, generated upon an operation of sensing a clothes amount, on the sensing of the clothes amount. It is preferred that the first predetermined RPM rpm0, correspond to an RPM sufficiently low to cause clothes m, to be washed, to come into constant contact with the inner peripheral surface of the wash tub 20.

Following the start-up, acceleration, and maintenance at the first predetermined RPM rpm0, the motor 30 is driven in a mode for determining the amount of the clo...

third embodiment

In accordance with the clothes amount sensing method according to the present invention, as shown in FIGS. 12 and 13, the control unit 49 first starts up the motor 30, and then accelerates the motor 30 until the RPM of the motor 30 reaches a predetermined RPM rpm1, for example, 130 rpm (acceleration stage Stage 1)(S301 and S302).

When the RPM of the motor 30 reaches the predetermined RPM rpm1, the control unit 49 maintains the motor 30 at the predetermined RPM rpm0for a predetermined time At (constant-speed stage Stage 2) (S303).

After maintaining the motor 30 at the predetermined RPM rpm0 for the predetermined time Δt, the control unit 49 turns off the motor 30, and controls the braking unit 50 to perform a braking operation involving generation of electricity. As the motor 30 is braked in accordance with the braking operation, it is decelerated (deceleration stage Stage 3) (S304 and S305).

In accordance with the clothes amount sensing method according to the third embodiment of ...

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Abstract

A clothes amount sensing method in a washing machine which is capable of reducing clothes amount sensing errors caused by frictional forces, thereby achieving an enhancement in accuracy and reliability. The method includes an acceleration step for accelerating, to a predetermined RPM, a motor adapted to rotate the wash tub, a constant-speed step for maintaining the motor at the predetermined RPM when an RPM of the motor reaches the predetermined RPM in accordance with the acceleration step, a deceleration step for turning off the motor to decelerate the motor, following the constant-speed step, and a clothes amount determination step for determining the amount of the clothes by use of equations of motion respectively established in the acceleration, constant-speed, and deceleration steps.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sensing the amount of clothes contained in a washing machine, and more particularly to a clothes amount sensing method in a washing machine which is capable of reducing clothes amount sensing errors caused by frictional forces. 2. Description of the Related Art Generally, a washing machine is an appliance adapted to remove contaminants attached to clothes by utilizing actions of detergent and water. The recent trend of such a washing machine is to sense the amount of clothes contained in the washing machine to perform wash, rinse, spin-dry, and dry cycles in accordance with a wash water level, wash time, amount of detergent, and water flows for rinse and wash cycles determined based on the sensed clothes amount. FIG. 1 is a sectional view illustrating an inner configuration of a general washing machine. As shown in FIG. 1, the washing machine includes a casing 2, a water tub 10 m...

Claims

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Application Information

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IPC IPC(8): D06F33/02D06F37/00D06F39/00
CPCD06F39/003D06F2204/06D06F2202/065D06F34/18D06F2101/00D06F2105/62D06F2103/38D06F2103/04D06F2105/48
Inventor JEON, SI MOONPARK, SEUNG CHULPARK, GWAN RYONGKIM, JAE HYUNSEO, HYUN SEOKLEE, TAE HEEHONG, SANG WOOKCHOI, BYUNG KEOLHONG, MOON HEE
Owner LG ELECTRONICS INC
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