Technical Multiecuscan results 2.3 130 euro6 2017

[theoneandonly]

I did a number of test runs with my Ducato in order to get a base point for a known good engine. No codes 8000miles. The data was collected on a specific test route that i can repeat, about a mile between 2 round abouts. How useful is it should i add a 20mile test route moastly dual caridgeway. Looking at the egr position results the actuals follow targets reasonably well but have some under and overshoots at sharp increase decrease in revs.
Are these all acceptable and could they be used for comparisson with other engine that have had problems eg the 401 code.

 

[Ocwobio]

These look pretty good, make sure you save them, and never need them!

 

[theoneandonly]

@Ocwobio
Thanks, i hope i dont need them. I am going to repeat something simular with alfaobd and a bt dongle over a 100mile run soon.

 

[theoneandonly]

I have now run data collection for 100mile trips using Alfaobd and a samsung J6 mobile phone and Vgate BT dongle.
graph not previously shown

In this case the measured versus target is quite different is this normal?
I created a template for further use. Is this a sensible group of measurements?
Time
Engine speed rpm
Engine coolant temperature °C
EGR high pressure valve required position mm
EGR high pressure valve measured position mm
EGR low pressure valve required position mm
EGR low pressure valve measured position mm
Lambda probe upstream oxygen concentration %
Lambda probe downstream Diesel Particulate Filter oxygen concentration %
Diesel Particulate Filter differential pressure sensor mbar
Fuel correction cylinder 1 mm3/stroke
Fuel correction cylinder 2 mm3/stroke
Fuel correction cylinder 3 mm3/stroke
Fuel correction cylinder 4 mm3/stroke
Throttle valve measured position %
Throttle valve target position %


Or should i include 2 of these 4 instead of the last 2
I can only monitor 16 pids at a time

Air flow rate mass measured mg/stroke Air Flow Rate target mg/stroke Turbocharger pressure measured mbar Turbocharger pressure target mbar​

 

[Anthony489]

Hi

It's possible your two measurements are in different units. The general shape is the same but they aren't simply scaled versions of each other. Both mg per stroke and grams per second are used, and their relationship depends on RPM. I can't give you a conversion formula as I am supposed to be cooking breakfast !

 

[theoneandonly]

@Anthony489 thanks for your thoughts , the software ( alfaobd)states mg/stroke for both whereas MES states mg/l.

I wonder what the sensors are calibrated in. I will have to see if I got simular data collected with MES.
Ps hope breakfast was good

 

[Anthony489]

Hi

I have done some rough calculations. Assume a 4 cylinder 4 stroke diesel of 2.3 litres. At idle with no turbo boost and ignoring EGR, assume the volumetric efficiency is 67% and air is 1.3 milligrams per cc. That gives about 500 mg of air per stroke.

At near full power with turbo boost, assume the volumetric efficiency rises to 134 %. That gives about 1000 mg of air per stroke, i.e. double the idle value. This seems to roughly tally with your dark blue "measured" trace.

For a 4 cylinder 4-stroke, multiply the milligrams per stroke by the RPM then divide by 30000 to Convert to the alternative units of grams per second.

Example 1: 500 mg/stroke x 800 RPM divided by 30000 equals 16.7 grams/second

Example 2: 1000 mg/stroke x 3200 RPM divided by 30000 equals 133.3 grams per second

The grams per second value for my chosen examples varies over an 8 to 1 range

I'm not sure if that is what you are seeing with the light blue "target" trace, but I hope this might be enough to send you in the right direction !

 

[theoneandonly]

@Anthony489 thanks for your efforts, hope you had your dinner before attacking that.
Time to play with numbers after I sorted the immersion heater. Bummer how life gets in way of fun

 

[theoneandonly]

Here's 2 from MES data

Much closer values than the fist shown (alfaobd data)
The other difference is the MES data is taken from a just warm engine 15 min run, the Alfa data from an engine running for 1 hour.