RE: [opendiag] Re: Fuel flow calculation

Hi
 
It is 2 kind of consumption calculation.
 
1.) momentan
2.) cumulative
 
 
you must have 2 info
 
1.) fuel flow count
2.) speed info
 
you calculate litre / delta t to have the momentan consumption (
delta t is sampling time of speed and flow info ) .simply you make delta
fuel flow / delta time
 
if you integrate in software the formel for a limited time , you have
the cumulative consumption
 
 
best regard
 
Bülent
 
 
-----Original Message-----
From: flyspark2000 [mailto:flyspark2000@...]
Sent: Wednesday, August 20, 2003 7:49 PM
To: opendiag@yahoogroups.com
Subject: [opendiag] Re: Fuel flow calculation
 

> Hi this is a 2 part question really.
>
> 1. Is it possible to get current fuel consumption figures using
> KWP2000? If so, how? I can't find it in the spec.

Depends what vehicle you are looking at but it is there on all fords
bmw's and mercedes , it is a constantly changing calculation done by
the fuel ECU giving an output in l/100 km.It is avalible in the live
data stream and its output goes over CAN to instrument cluster and
trip computer
>
> 2. If it's not possible to get it from the ECU, what's the easiest
> way to calculate or even measure the current fuel consumption?
>
> I could put a fuel-flow-meter in the fuel line, but I'd need to fit
> two of them as most vehicles these days pump fuel to the engine and
> back to the tank continously. No?

Most modern cars have now gone to a single line system from the
filter to the rail with pressure regulator in the filter ( cheaper?)
so no return to tank anymore.Pressure is always constant over intake
pressure (not atmospheric pressure) so only input you need if you are
going to do it that way is injector duration time , standard stuff
form datastream on OBD 11 and E-OBD

Ian

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Received on Sun Aug 24 03:49:20 2003