'Re: FuzzyTech MP'
| It might help if everyone were aware of what actually happens in
a fuzzy system. The fuzzy-Tech system actually creates a series
of PID or PI control algorithms depending upon the input variables
to the control. A different control for each set of inputs.
This is the main advantage of a fuzzy system. It can model
multivariate control outputs (and inputs) much more easily than a
traditional PID. To perform an engine control based upon numerous
inputs and controlling two outputs (fuel flow and torque) using a
PID required several hundred hours of development time using many
different software iterations (It was a turbo-prop engine.)
Furthermore, the two output system required a complex matrix
system called H-Infinity to perform the calculations with the
other output in mind. A fuzzy system would probably be able to
come up with a system to at least test the engine in a matter a
You are all correct, you cannot verify a fuzzy system. And for
that reason alone I would not use it on an aircraft, not to
mention that I prefer an optimized PID controller for both
performance and economy. However, in non-critical systems, the
fuzzy system does create a method for creating a control system
quickly and efficiently. The only way an engineer will ever trust
a fuzzy logic is to create a control using something like
fuzzy-Tech MP and look at the assembly code it generates. Much
like using a C Compiler there will always be ways to optimize.
Senior Software Engineer
Microchip Technology, Inc.
Pete Brink wrote:
> .... You are all correct, you cannot verify a fuzzy system.....
This might be the crux of a lot of the controversy surrounding fuzzy
Please define verify in this context.
Thanks - Tom Rogers VP - R&D Time Tech, Inc.
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