Drum type washing machine and method of detecting laundry weight thereof
First Claim
1. A method of detecting laundry weight of a drum type washing machine, comprising the steps of:
- calculating a ratio of input voltage applied to a motor through phase control, i.e., a modified voltage value, every control cycle; and
determining the weight of laundry based on the modified voltage value calculated when the motor is rotated at constant speed.
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Accused Products
Abstract
A drum type washing machine and a method of detecting laundry weight thereof that is capable of calculating a ratio of input voltage applied to a motor through phase control until the motor reaches a determined number of rotations to accurately detect the weight of laundry or the amount of eccentricity of the laundry received in a drum connected to the motor. The drum type washing machine comprises a motor for rotating a drum, and a control unit for controlling the number of rotations of the motor depending upon a washing operation and calculating a ratio of input voltage applied to the motor, i.e., a modified voltage value, to determine the weight of laundry received in the drum. The weight of laundry received in the drum is accurately detected in steps, and therefore, water consumption is reduced, and a uniform washing operation is performed.
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Citations
18 Claims
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1. A method of detecting laundry weight of a drum type washing machine, comprising the steps of:
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calculating a ratio of input voltage applied to a motor through phase control, i.e., a modified voltage value, every control cycle; and
determining the weight of laundry based on the modified voltage value calculated when the motor is rotated at constant speed. - View Dependent Claims (5)
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2. A method of detecting laundry weight of a drum type washing machine, comprising:
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a first step of applying phase-controlled input voltage to a motor;
a second step of calculating a ratio of voltage applied to the motor to one-cycle input voltage, i.e., a modified voltage value, every phase control cycle, and determining whether the number of rotations of the motor reaches a predetermined number of rotations; and
a third step of adding the modified voltage values calculated at the second step, when the number of rotations of the motor reaches the predetermined number of rotations, to determine the weight of laundry. - View Dependent Claims (3, 4, 18)
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6. A method of detecting laundry weight of a drum type washing machine, comprising:
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a first step of applying input voltage, phase of which is controlled by a triac, to a motor;
a second step of calculating a ratio of voltage applied to the motor to one-cycle input voltage, i.e., a modified voltage value, every phase control cycle, and determining whether the number of rotations of the motor reaches a predetermined number of rotations; and
a third step of calculating ripples in the number of rotations of the motor for a predetermined period of time, when the number of rotations of the motor reaches the predetermined number of rotations, and detecting the weight of laundry based on the sum of the modified voltage values calculated at the second step and the calculated ripples in the number of rotations of the motor. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A drum type washing machine comprising:
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a motor for rotating a drum; and
a control unit for controlling the number of rotations of the motor depending upon a washing operation and calculating a ratio of input voltage applied to the motor, i.e., a modified voltage value, to determine the weight of laundry received in the drum. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification