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Browse Prior Art Database

Adaptive Fill Algorithm

IP.com Disclosure Number: IPCOM000029319D
Publication Date: 2004-Jun-23
Document File: 3 page(s) / 38K

Publishing Venue

The IP.com Prior Art Database

Abstract

Water level in washer tub and basket is electronically sensed at or near the bottom of the tub. Sensor provides a repeatable and reproducible signal back to a control located somewhere on the washer. Depending on load type selected, precise level limits will be established, which automatically compensate for load amount and its absorption rate.

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Title of Invention:

Adaptive Fill Algorithm

Invention Abstract Water level in washer tub and basket is electronically sensed at or near the bottom of the tub. Sensor provides a repeatable and reproducible signal back to a control located somewhere on the washer. Depending on load type selected, precise level limits will be established, which automatically compensate for load amount and its absorption rate.

Problem or requirement addressed by the invention Conventional washer requires input from consumer to determine fill volume. Low water levels with large loads represent a high wear/damage environment. Adaptive fill would eliminate wrong selections leading to this condition.

How has this problem or requirement been addressed before? In prior art, actual volume was actively monitored and compared against measure liquid levels. Gradients between the actual volume and measured volume (via liquid level) are used to estimate load. Based on the load estimate, the final volume is determined and final fill executed.

How the invention works When plotting the measured level response (directly related to floating volume in tub) against actual volume (measured at the water supply source), different loads display distinctive slopes and gradients. Spin speeds during fill operations also have a pronounced effect on the level detection. The faster the spin speed the earlier water levels are detected. It tends to compress the absorption rate. Rather than comparing gradients like the prior art, I propose setting a single distinct level limit for cotton load selections and another for permanent press selections at a given spin speed (40-80 rpm range). Cotton & permanent press loads have different absorption characteristics, and thus different limits. This limit will based on empirical data and will be conservatively selected such that it will err on too much water. Example: Cotton Load Selection - Measure Level Limit will be 10.5 Gallons. 12 lb loads will actually require 12 gallons to reach the 10.5 measured limit, 8 lb loads will require only 10 gallons to reach 10.5 measured limit, 2 lbs and under will actually reach the limit at 7.5 gallons. The volume in each case self corrects based on the load. In the case of permanent...