milage indicator

Thu Nov 23 15:04:08 GMT 2000

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> -----Original Message-----
> From: Brian Warburton [mailto:BrianWarburton at compuserve.com]
> Sent: Thursday, November 23, 2000 3:40 PM
> To: INTERNET:diy_efi at diy-efi.org
> Subject: RE: milage indicator
> 
> 
> If you do want to do it all from the injector pulsewidths 
> you'll need to
> factor in the injector opening and closing time and because 
> of that you'll
> also need the battery voltage as that has a direct effect of injector
> opening time. A pulse width of 4mS measured at the injector 
> will NOT flow
> twice the amount of fuel as a 2mS pulse. Also, a 4mS pulse with VBAT =
> 14.4v flows a lot more fuel than a 4mS pulse with VBAT = 12v 
> because the
> injector opens a lot faster with the higher voltage.

I know, that what I stated in my original posting.

> To give you an idea of the achievable accuracy, I originally 
> wrote the Ford
> EEC-iv tripminder code for the 2.0L DOHC back in 1987 and the required
> accuracy then was < 5%. We achieved better than that, but not 
> a lot better

Well, I don't want it to be accurate down to 1 promille or so. What
processor does that tripminder use? 
I know there are two versions, the original of 1983 (used in Granada and
Sierra's) which used a flowmeter, and the later tripminder of 1986 or so,
which has less functions and changed appearance. 
I have folders with pictures of these module. They look cool with there
Vacuum Fluorescent Displays.

JJ

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<TITLE>RE: milage indicator</TITLE>
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&gt; -----Original Message-----
 &gt; From: Brian Warburton [<A =
HREF=3D"mailto:BrianWarburton at compuserve.com">mailto:BrianWarburton at comp=
userve.com</A>]
 &gt; Sent: Thursday, November 23, 2000 3:40 =
PM
 &gt; To: INTERNET:diy_efi at diy-efi.org
 &gt; Subject: RE: milage indicator
 &gt; 
 &gt; 
 &gt; If you do want to do it all from the injector =
pulsewidths 
 &gt; you'll need to
 &gt; factor in the injector opening and closing time =
and because 
 &gt; of that you'll
 &gt; also need the battery voltage as that has a =
direct effect of injector
 &gt; opening time. A pulse width of 4mS measured at =
the injector 
 &gt; will NOT flow
 &gt; twice the amount of fuel as a 2mS pulse. Also, =
a 4mS pulse with VBAT =3D
 &gt; 14.4v flows a lot more fuel than a 4mS pulse =
with VBAT =3D 12v 
 &gt; because the
 &gt; injector opens a lot faster with the higher =
voltage.

<P><FONT SIZE=3D2>I know, that what I stated in my original =
posting.</FONT>
</P>

&gt; To give you an idea of the achievable accuracy, =
I originally 
 &gt; wrote the Ford
 &gt; EEC-iv tripminder code for the 2.0L DOHC back =
in 1987 and the required
 &gt; accuracy then was &lt; 5%. We achieved better =
than that, but not 
 &gt; a lot better

Well, I don't want it to be accurate down to 1 =
promille or so. What processor does that tripminder use? 
 I know there are two versions, the original of 1983 =
(used in Granada and Sierra's) which used a flowmeter, and the later =
tripminder of 1986 or so, which has less functions and changed =
appearance.

I have folders with pictures of these module. They =
look cool with there Vacuum Fluorescent Displays.

<P><FONT SIZE=3D2>JJ</FONT>
</P>

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