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Method and apparatus for determining laundry load

  • US 8,176,798 B2
  • Filed: 07/09/2009
  • Issued: 05/15/2012
  • Est. Priority Date: 07/09/2009
  • Status: Expired due to Fees
First Claim
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1. A method of operating a laundry treating appliance having a rotatable drum defining a treating chamber, a motor driving the rotation of the drum, and a controller for controlling the operation of the motor according to a treating cycle of operation, the method comprising:

  • accelerating the motor speed to a set speed with an underdamped control scheme such that a transient speed of the drum oscillates within a decaying envelope relative to the set speed; and

    determining a parameter indicative of the torque of the motor while the motor is accelerated with the underdamped control scheme; and

    determining a load size based on the parameter.

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