What kind of FE instrumentation for Pre-OBD2 Diesel

[AndrzejM]

Originally Posted by oil pan 4

Mechanical diesels normally use a lumosity probe adaptor that goes in a glow plug hole to detect combustion. The lumosity adaptors are typically used drive a standard gasoline timing light.
I have one and its so nice, not having to guess at your timing.

True, but you can check timing but not a fuel dose... I'm still thinking how to build a kind of OldDieselMPGduino

[oldbeaver]

Hellow AndrzejM,

I have an old diesel myself and tried two ways to estimate fuel yield:

First way:

Compute real time speed (km/hour) and real time fuel consumption (liters/hour) and divide the first by the second, giving me km/l.

This way is noy easy, but is the best.

Getting real time speed: in my case this signal was already available, I just find the correct spot to get it. Check yr car´s manuals.

Computing fuel consumption:

I constructed an arduino device, and second, I installed two tiny electronic flow meters: one on the main fuel conduct (from feeding pump to injector pump) and the second in the fuel return pipe (from injector pump to tank).

Then I read both signals to Arduino and calculated the difference between them. That is the real time fuel consumption.

Of course, it is necessary to build a program to compute all variables and I found that signals are very unstable, so decided to compute a moving average value instead. Every 5 seconds I computed the fuel efficiency using these moving average values.

Second way (easier):

Using the same Arduino board, I constructed a math model (armonic curves) where fuel consumption was a function of only two variables: rpm and throttle position.

(Using this method, you don´t need the fuel meters, which are very difficult to obtain for the tiny fuel flow. Besides, a gentleman from Suiss gave them to me, but they stop working after some months. After that, they broke producing a fuel spill).

At a fixed throttle position, fuel injected by the injection pump depends only on rpm. It is a convex ascending curve, if you know what I mean. I found the curve for my injection pump (a Zexel rotative, probably the same you have) with a pump repare shop and made a family of almost parallel curves where each level represented a throttle position.

This method won´t give you absolute exactitude but will give you very good relative exactitude for comparison purposes. And the model can be adjusted to tank measures, making it very good for estimating real fuel yield of yr car.

If you need more information, please ask.

Best,

OldBeaver

[AndrzejM]

Originally Posted by oldbeaver

I constructed an arduino device, and second, I installed two tiny electronic flow meters: one on the main fuel conduct (from feeding pump to injector pump) and the second in the fuel return pipe (from injector pump to tank).

Hi OldBeaver,

Thans for sharing. That's great idea but could you please share a bit more and let me know what type/model of flow meters you're using for your setup? I'm really interested in building such device on my own.

Best
Andrzej

[oldbeaver]

Originally Posted by AndrzejM

Hi OldBeaver,

Thans for sharing. That's great idea but could you please share a bit more and let me know what type/model of flow meters you're using for your setup? I'm really interested in building such device on my own.

Best
Andrzej

Andrzej,

As I told you, the flow meters didn´t last for long, as they where adapted from other use (they are not designed for fuel flow). I lost the contact with the source with my old hard disk, but if I found it, will send it to you.

There is another guy in this forum that made something similar. Look here:
http://ecomodder.com/forum/showthrea...pace-2115.html

May the Luck be with you !

OldBeaver

[oldbeaver]

Originally Posted by AndrzejM

Hi OldBeaver,

Thans for sharing. That's great idea but could you please share a bit more and let me know what type/model of flow meters you're using for your setup? I'm really interested in building such device on my own.

Best
Andrzej

Look here:

MPGuino - EcoModder

OldBeaver

[AndrzejM]

Old Beaver - I've build MPGuino on my own but for Previa which have gasoline engine.

Anyway I found interesting flow meters for diesel fuel, just take a look here:
Flow Meters

[skyking]

Thank you!
I sent them this email to see what I can find out.

Hello,
I would like information on where to purchase your products for diesel flow in mechanical injected engines. I would like specifications for building my own display and recording systems, as well as off the shelf display and recording systems.

It would be so slick to build an arduino based flow and totalizer that also took care of all my other needs.

[AndrzejM]

I'm glad I could help.
And please keep me posted on the subject.

[skyking]

will do! I found this earlier, $705 for a somewhat crude analog display and totalizer for my truck.
Floscan Instrument Co. Inc.
I'm hoping for better from your link.

[AndrzejM]

I'll keep my fingers crossed!