milage indicator

Thu Nov 23 13:16:58 GMT 2000

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> -----Original Message-----
> From: Franc Buxton [mailto:fab at dcs.warwick.ac.uk]
> Sent: Thursday, November 23, 2000 1:36 PM
> To: diy_efi at diy-efi.org
> Subject: Re: milage indicator
> 
> 
> Jeroen Proveniers wrote:
> > 
> > Hello,
> > 
> > I want to have a (accurate) milage indicator in my new car 
> (Ford Sierra 2.0i
> > '92). I don't want to use flowmeters (I'd need two, supply 
> and return)
> > because these are quite expensive, and I don't want to cut 
> into fuel lines
> > anyway.
> > So I figured that I could measure the injector pulsewidths. 
> The indicator
> > would need the following parameters of the injectors:
> > -turn on time
> > -flowrate
> > -flowrate versus battery voltage
> > 
> > So the circuit must measure the battery voltage and time 
> the injector
> > pulsewidth.
> > The car is a four cylinder with two banks of two injectors 
> (there is no
> > seperate starting injector). For most accurate metering I 
> would need to
> > measure both banks.
> > 
> > Would this work?
> > 
> 
> 	Hi, Jeroen,
> 
> 	I wonder if you are taking the accuracy a little too 
> far! How accurate

That's why I ask the list -:)

I want to have an accuracy of around 1 decimal, eg. 1 km/14.5 litres. 
I think battery voltage is indeed not so important and will complicate the
circuit, but the turn-on time is. If you neglect this one, an error will
build up in the long run (total used fuel).

JJ

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<TITLE>RE: milage indicator</TITLE>
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&gt; -----Original Message-----
 &gt; From: Franc Buxton [<A =
HREF=3D"mailto:fab at dcs.warwick.ac.uk">mailto:fab at dcs.warwick.ac.uk</A>]<=
/FONT>
 &gt; Sent: Thursday, November 23, 2000 1:36 =
PM
 &gt; To: diy_efi at diy-efi.org
 &gt; Subject: Re: milage indicator
 &gt; 
 &gt; 
 &gt; Jeroen Proveniers wrote:
 &gt; &gt; 
 &gt; &gt; Hello,
 &gt; &gt; 
 &gt; &gt; I want to have a (accurate) milage =
indicator in my new car 
 &gt; (Ford Sierra 2.0i
 &gt; &gt; '92). I don't want to use flowmeters (I'd =
need two, supply 
 &gt; and return)
 &gt; &gt; because these are quite expensive, and I =
don't want to cut 
 &gt; into fuel lines
 &gt; &gt; anyway.
 &gt; &gt; So I figured that I could measure the =
injector pulsewidths. 
 &gt; The indicator
 &gt; &gt; would need the following parameters of the =
injectors:
 &gt; &gt; -turn on time
 &gt; &gt; -flowrate
 &gt; &gt; -flowrate versus battery voltage
 &gt; &gt; 
 &gt; &gt; So the circuit must measure the battery =
voltage and time 
 &gt; the injector
 &gt; &gt; pulsewidth.
 &gt; &gt; The car is a four cylinder with two banks =
of two injectors 
 &gt; (there is no
 &gt; &gt; seperate starting injector). For most =
accurate metering I 
 &gt; would need to
 &gt; &gt; measure both banks.
 &gt; &gt; 
 &gt; &gt; Would this work?
 &gt; &gt; 
 &gt; 
 &gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Hi, =
Jeroen,
 &gt; 
 &gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I wonder if you =
are taking the accuracy a little too 
 &gt; far! How accurate

<P><FONT SIZE=3D2>That's why I ask the list -:)</FONT>
</P>

I want to have an accuracy of around 1 decimal, eg. 1 =
km/14.5 litres. 
 I think battery voltage is indeed not so important =
and will complicate the circuit, but the turn-on time is. If you =
neglect this one, an error will build up in the long run (total used =
fuel).

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

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