milage indicator

[Rich M]

yes, it's how some vehicle manufacturers do it. Under normal driving
conditions there's no reason why it shouldn't be pretty accurate.

Rich

> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Jeroen Proveniers
> Sent: 23 November 2000 11:41
> To: 'DIY EFI'
> Subject: milage indicator
>
>
> 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?
>
> JJ
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