Method for sensing amount of clothes in washing machine
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FIG. 5 is a flow chart illustrating a clothes amount sensing method according to a first embodiment of the present invention. FIG. 6 is a graph depicting an operating condition of a motor adapted for sensing of the clothes amount in accordance with the first embodiment of the present invention.
The washing machine, to which the clothes amount sensing method according to the present invention is applied, has the same configuration as that of the general washing machine shown in FIG. 1. In the following description, accordingly, respective constituent elements of the washing machine are designated by the same reference numerals as those of FIG. 1, and no detailed description thereof will be given.
In accordance with the clothes amount sensing method according to the first embodiment of 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...
Example
FIG. 7 is a flow chart illustrating a clothes amount sensing method according to a second embodiment of the present invention. FIG. 8 is a graph depicting an operating condition of the motor adapted for sensing of the clothes amount in accordance with the second embodiment of the present invention.
In accordance with the clothes amount sensing method according to the second embodiment of 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 R...
Example
FIG. 12 is a flow chart illustrating a clothes amount sensing method according to a third embodiment of the present invention. FIG. 13 is a graph depicting an operating condition of a motor adapted for sensing of the clothes amount in accordance with the third embodiment of the present invention.
In accordance with the clothes amount sensing method according to the third embodiment of 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, ...
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