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'Milage computer'
2006\08\08@125111 by John Ferrell

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I am not having any luck finding an aftermarket computer for gasoline consumption with Google.

The one that is factory installed in my 2001 Chrysler Minivan works very well.

The intended target install is a Winnebago (1999 Ford 350-V10 engine).

I was hoping to find something off the shelf with a DIY install. I would consider a project, but my completion rate has been pretty poor lately.

I think AVR has a contest for the Butterfly that is still open. How about one of you fellows with the smarts & ambition execute this project & win the contest?

John Ferrell    W8CCW
"My Competition is not my enemy"
http://DixieNC.US

2006\08\08@130754 by David VanHorn

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On 8/8/06, John Ferrell <spam_OUTjohnferrellTakeThisOuTspamearthlink.net> wrote:
>
> I am not having any luck finding an aftermarket computer for gasoline
> consumption with Google.



Zemco used to do that stuff, all COPS based (ICK!)  but they worked well.
The fun comes in when trying to measure the fuel used.
Used to be that you could take an injector pulse as a given size squirt, but
not anymore.
For carbed vehicles, they had a flow sensor, but now we have systems that
return fuel to the tank, which drives that nuts.

Distance was easy, four magnets around the drive shaft, and an inductive
pickup.

2006\08\08@132033 by M. Adam Davis

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I'm not going to do it, but I'd use the OBD-II port on the car.  It
can give you speed and air intake.  Air intake is directly related to
fuel consumption.

See:
http://www.mp3car.com/vbulletin/showthread.php?t=75138

-Adam

On 8/8/06, John Ferrell <.....johnferrellKILLspamspam@spam@earthlink.net> wrote:
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> -

2006\08\08@133850 by Michael Rigby-Jones

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>-----Original Message-----
>From: piclist-bouncesspamKILLspammit.edu [.....piclist-bouncesKILLspamspam.....mit.edu]
>Sent: 08 August 2006 18:20
>To: Microcontroller discussion list - Public.
>Subject: Re: Milage computer
>
>
>I'm not going to do it, but I'd use the OBD-II port on the
>car.  It can give you speed and air intake.  Air intake is
>directly related to fuel consumption.
>

Not very accurately.  The AFR will change depending on wether the car is at idle/cruise or accelerating hard (WOT).

On a multi-point system injector pulse widths should be useable if the injection system uses a pressure regulator that accounts for manifold vacuum/pressure.  Most do.  Note that with width of the pulse is not perfectly proportional to fuel quantity as the injector takes a finite length of time to open and close.

Regards

Mike

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2006\08\08@134001 by PicDude

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On Tuesday 08 August 2006 12:20, M. Adam Davis wrote:
> I'm not going to do it, but I'd use the OBD-II port on the car.  It
> can give you speed and air intake.  Air intake is directly related to
> fuel consumption.
>
> See:
> http://www.mp3car.com/vbulletin/showthread.php?t=75138
>
> -Adam

Not directly -- this would also involve knowing the air-fuel ratio as well.  
Most vehicles today operate between about 12:1 to about 17:1 AFR depending on
operation state (hard acceleration, cruise, idle, warm-up, etc).  And at
certain times outside of that range.  This introduces a very significant
error.  Also note that on turbocharged vehicles, the blow-off valve is
generally located after the mass-air sensor, so air dumped there would need
to be accounted for as well.

Cheers,
-Neil.

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