Equation of the SAW signal: need some explanation

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Ludotech
MegaSquirt Newbie
Posts: 34
Joined: Mon Nov 07, 2005 6:02 am
Location: Belgium

Equation of the SAW signal: need some explanation

Post by Ludotech »

Hello,

In the EDIS documentation, I read this:

The initial equation: SAW = ZTDC - (ST × T × 2.sup.x/CMI)

So, if I understand correctly:

ZTDC = 1536 microseconds
T = 0.000004 second
CMI = 10 °
What is 2.sup.x?
I don't understand this :
* 2.sup.x is the number of steps between position signals for a desired spark resolution and x is a whole number

The final equation is thus:

SAW = 1536 - (25.6 × (desired spark advance in degrees)) (in µsec)
Range: 64 - 1792 µsec (57½° BTDC to 10° ATDC)
Resolution: 4 µsec

Could someone explain to me 2.sup.x (in an "easy english" and the correct values if possible)?
If someone has documentation about the working of an EDIS module, it would be great!

Thanks in advance

Ludovic
V3 with MS II (blue board),Code v2.35,MT 2.25 + ford EDIS:
Engine: 1300 cc hyundai (G4EH), 4 cylinders, port injection.
Bernard Fife
Super Squirter
Posts: 1009
Joined: Mon Feb 16, 2004 3:15 pm

Post by Bernard Fife »

Ludovic,

To understand the inner workings of the EDIS module, read US patent numbers 4,661,778, 4,922,874, and 5,014,676 at http://www.uspto.gov.

Lance.
Ludotech
MegaSquirt Newbie
Posts: 34
Joined: Mon Nov 07, 2005 6:02 am
Location: Belgium

Post by Ludotech »

Thanks Lance!

I'm going to read this :RTFM:
V3 with MS II (blue board),Code v2.35,MT 2.25 + ford EDIS:
Engine: 1300 cc hyundai (G4EH), 4 cylinders, port injection.
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