Whirlpool Corporation

Fernando E De Oliveira

Erol D Sumer

A method of estimating water mass extraction in a laundry treating appliance having a drum at least partially defining a treating chamber for receiving a laundry load for treatment according to a cycle of operation, and a motor operably coupled with the drum to rotate the drum, where geometry changes in a laundry load affect inertia estimations. The method includes rotating the drum during a water extraction cycle to at least two distinct speeds, each for a dwell time, by way of at least one acceleration ramp and determining, during the rotation, by a controller communicably coupled with the motor, at least one of a torque of the motor, an acceleration of the drum, a speed of the drum, or an angular position of the drum. A parameter estimator estimates inertia values of a laundry load in the drum, based on at least one of the torque, acceleration, speed, or angular position of the drum at a beginning and an end of each dwell time. A water mass extraction is determined based on the estimated inertia values. The cycle of operation is adjusted based on the determined water mass extraction.

Laundry treating appliance and methods of operation

A method of estimating water mass extraction in a laundry treating appliance where the geometry changes in a laundry load affect inertia estimations includes accelerating rotation of the drum during a water extraction cycle to at least two distinct speeds, each for a dwell time, by way of acceleration ramps; determining, during the accelerating rotation, by a controller communicably coupled with the motor, a torque of the motor, an acceleration of the drum, a speed of the drum, and/or an angular position of the drum; and estimating with a parameter estimator inertia values of a laundry load in the drum, based on the torque, acceleration, speed, and/or angular position of the drum at the beginning and the end of each dwell time. The estimated inertia values are transformed based on differing geometries of the laundry load, and water mass extraction is determined based on the transformed estimated inertia values.

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Fernando E De Oliveira