Parameter set up method of membership functions for fuzzy control of washing machine motor
US5774630A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1996 |
| Grant date | Jun 30, 1998 |
| Priority date | — |
| Expiry date | Nov 20, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S706/90
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The present invention is disclosed to provide a parameter set-up method for a membership function of fuzzy control in a washing machine by which time and manpower necessary for design of a product can be reduced, an accurate design of the product can be made possible and performance of the product can be improved. The method includes the steps of: providing an auxiliary fuzzy logic controller having M parameters in a controller membership function as input and an error between a rotary speed of a washing machine motor and a reference speed as output (first step); classifying the M parameters into N respective sections and generating a fuzzy rule for the auxiliary fuzzy logic controller through N.sup.M experiments (second step); obtaining through the experiments an error between an output curve and a reference curve which is a graph of a sampling time versus a rotary speed of the motor (third step); utilizing the error between the output curve and the reference curve to execute a first genetic algorithm so that the parameters of the auxiliary fuzzy logic controller can be optimized (fourth step); and executing a second genetic algorithm against the parameters of the auxiliary fuzzy …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.