Newsgroups: comp.ai.fuzzy
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From: joep@neon.dfrf.nasa.gov (Joe Pahle)
Subject: fuzzy PI rules sets ?
Message-ID: <D12HH3.M2K@news.dfrf.nasa.gov>
Sender: news@news.dfrf.nasa.gov
Reply-To: joep@neon.dfrc.nasa.gov
Organization: NASA Dryden Flight Research Center, Edwards, CA
Date: Mon, 19 Dec 1994 16:51:02 GMT
Lines: 35

I have an over-damped system that I am controlling (O.K. playing with
...), and I want to use PI instead of PD or PID. I have seen (and
used) many examples of PD rules and a few higher level descriptions of
PID rule sets, but no PI examples. I am looking for something similar
to the 2D rule set for error and error rate:

                             error                                
            
                     NL NM NS ZE PS PM PL
                     --------------------
                NL|  ZE PS PM PL PL PL PL          
                NM|  NS ZE PS PM PL PL PL
        error   NS|  NM NS ZE PS PM PL PL
        rate    ZE|  NL NM NS ZE PS PM PL
                PS|  NL NL NM NS ZE PS PM
                PM|  NL NL NL NM NS ZE PS
                PL|  NL NL NL NL NM NS ZE

  ... but with integral error instead of error rate.
I assume that the middle column will stay the same for integral error
instead of error rate, but I would like to see some examples of the
"off-axis" rules. BTW I am using a limited integral to prevent wind-up.

-- 

Joseph W. Pahle 
F-18 HARV flight controls 
phone: 805 258-3185
e-mail: joep@neon.dfrc.nasa.gov 
NASA Dryden Flight Research Center, Edwards,CA
********* laywers, look away !! ******************** 
There is no relationship between my opinion and NASA policy
********* O.K. you sharks, you can look again ******


