  dkjones96 Sweet! 04-08-2009, 08:06 AM
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04-15-2009, 02:58 PM
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#34
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Registered Member
Join Date: Mar 2009
Posts: 1,139
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The LUT would just be an "on the paper" estimate, so it can be pretty sparse, with a control loop finding the exact value. As I wouldn't want to compute different ones for each model of car, I can't get very specific anyway. While speed changes are pretty slow, so is the OBDII update rate, so I thought a table to get in the ballpark would enhance performance a bit. I guess I could have it cache values for future use. I can always interpolate the entries if needed to strike a compromise. That's the method of fuzzy logic controllers in a nutshell: LUT with a hack to interpolate.
I don't think any system not incorporating a GPS would be worth actually building. Maybe not even that.
I hear you on the space concerns. I'm writing a project with a LUT right now for an AVR tiny12 and that sucker has very little onboard. Fortunately the table is only 18x2, since the data range required is pretty small.
__________________
Main Entry: co de pen dence - see codependency
co de pen den cy
Pronunciation: \kō-di-ˈpen-dən(t)-sē\
Function: noun
Date: 1979
: a psychological condition or a relationship in which a person is controlled or manipulated by another who is affected with a pathological condition (as an addiction to alcohol or heroin) ; broadly : dependence on the needs of or control by another
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