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 MPH from OBD1 or OBD2

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Kchew Posted - Nov 14 2005 : 11:31:00 PM
Hi ,
http://scangauge.com/ is a device that tells on a vehicles performance including real time MPG. All US cars after 1995 have a plug that export these data, I believe it's OBD1 and OBD2.

I want to build a similar unit to a Scangauge but only outputs MPG, small, simplier and economical.
Can you help or know sources that do.

Thanks
3   L A T E S T    R E P L I E S    (Newest First)
Aaron Cake Posted - Nov 18 2005 : 09:28:59 AM
Any electronics engineer. Be prepared to spend $10,000-$50,000 for the first prototype.

I know that I've seen a commercial product that already does this. Have you checked eBay?

You can also get a reasonably close MPG gauge just by using a vacuum gauge.
Kchew Posted - Nov 15 2005 : 11:33:05 AM
Anyone know people who can build this for me?
Thanks
Aaron Cake Posted - Nov 15 2005 : 11:22:04 AM
You still need to understand the OBD protocal to do this. There are several open source OBD circuits out there, I just can't recall what they are called. A Google for "diy obd", "open source obd" or the like should turn it up. You'll need a microcontroller to do the calculation based on injector duty cycle, size of the injector, and fuel pressure. Some vehicles also put out a signal from their mass airflow sensor which is often used by these calculations.

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