Pantone modification for Renault Laguna 2.0l petrol

Edits and changes to engines, experiences, findings and ideas.
User avatar
nlc
Econologue expert
Econologue expert
posts: 2751
Registration: 10/11/05, 14:39
Location: Nantes




by nlc » 02/01/06, 13:48

In terms of linearity there is no problem, because the pressure is regulated upstream of the injector. So normally the quantity injected is well proportional to the opening time.

But I did a little rough calculation on the road yesterday.
I was at 100km / h, engine at 2500rpm, and I was doing 6L / 100km.

So to make 100km, it would have taken me 1 hour, and at 2500rpm, my engine would have made 150000 revolutions.
As on these 100km I would have consumed 6L, that means that each revolution, the engine swallows 40uL (40 x 10E-6 liter).

Since I know that an injector pulse lasts between 0 and 20ms, it gives me a good basis for calculation.
0 x
User avatar
muzo_31
I understand econologic
I understand econologic
posts: 85
Registration: 07/10/05, 17:11




by muzo_31 » 02/01/06, 16:44

You would have had the pulse width, you could have calculated your constant µL direct by step timer. Your test is exactly the one I was thinking about.

Given the strong time constants and the symmetries, measuring on an injector and multiplying by 4 seems to me a good approximation.

Do you code in assembler or C?

On your turntable, provide an RS232 output for debugging (you take out the key variable every second, for example, it speeds up the debugging a lot)
0 x
User avatar
nlc
Econologue expert
Econologue expert
posts: 2751
Registration: 10/11/05, 14:39
Location: Nantes




by nlc » 08/01/06, 23:32

Yes, I have made the device display 3 measurements of the chrono injector (timer value): current value, min value, max value.

I could see the range of pulse width that the injector receives.

By cons I ordered special optocouplers, very fast, so as not to lose precision. But I will receive them only from January 17th.

Otherwise I also think that measuring the order of an injector and extrapolating to 4 will give the right average.

Otherwise I code in C, the compilers are now so good that I don't really bother anymore ....

It is especially that it allows you to make very portable code, 50% of the software that I installed in this project I recovered it from software bricks that I have already written. Screen, keyboard, etc. management

The other reason is that I work on large critters (style h8-3069 from renesas), and I see myself poorly coding in assembler on this kind of machine ... :D

For debugging, I always plan a debug output, but there is no need, since there is a screen;)
0 x
User avatar
PITMIX
Pantone engine Researcher
Pantone engine Researcher
posts: 2028
Registration: 17/09/05, 10:29
x 17




by PITMIX » 09/01/06, 10:21

Great guys.
Just a quick question because I'm having trouble keeping up. Do you just want to make an on-board computer for consumption or also control the frequency of injectors?
0 x
User avatar
nlc
Econologue expert
Econologue expert
posts: 2751
Registration: 10/11/05, 14:39
Location: Nantes




by nlc » 09/01/06, 10:25

No, it's just to have the average consumption of a trip and the real time consumption.
It will facilitate the testing of different fuel saver assemblies (pantone, electrolysis, etc.)

On the other hand, this can only be applied to sufficiently recent vehicles which incorporate electronic injection.
0 x
User avatar
muzo_31
I understand econologic
I understand econologic
posts: 85
Registration: 07/10/05, 17:11




by muzo_31 » 09/01/06, 10:49

nlc,

Your approach seems healthy to me;)
Me too, I code in C even on small microphones. I no longer have the patience either to learn the assembler of each cpu. my youth left me ... OK also for the portability aspect, it is also my philosophy.

Beware of optos, it may disturb your measurement. You know, a resistance + a pair of diodes makes a top protection against the small events of the life. it seems to hold lightning while opto flamed before. (on a personal telemetry montage)

I always foresee an RS232 even on the assemblies which have a screen because often, the microphones have unused, and it is always nice to provide a keyboard sequence which lays all the variables of the systems on the hyperterminal ... To simplify the cards, I have made some kind of probes that translate the level (TTL to RS232) like that, a terminal connection comes down to a connector on my target app.

I'll watch your asic, I didn't know this brand. Where do you buy them? At what price ?

In your job, what do you do? Are you employed or self-employed?

A +.
0 x
User avatar
nlc
Econologue expert
Econologue expert
posts: 2751
Registration: 10/11/05, 14:39
Location: Nantes




by nlc » 09/01/06, 11:14

It's not an asic, it's a microcontroller. It is a 16 bit hitachi, with 512Kb of flash, 16kb of ram, 3 serial ports, full of functions. But above all, I use gcc as a compiler, which is free and which runs on Linux;)
It costs quite expensive, in the 15 € I think, but we have to touch it at 11 I think.

I never had trouble with optos me !?

For debug, I do exactly like you, except that as I do a lot of embedded web, most of my cards include an ethernet connection, I send debug messages through this, in UDP, on my PC which acts and displays messages in a console.

But on this project I put a very inexpensive little microphone, the 16F6xxA series, and I no longer have legs available;)
But it does not matter, the software is anyway very simple, and to debug I display on the screen.

In my job, I am an electronic developer, I am ... freelance employee :)))
In fact we are 2 partners, but I preferred to keep the status of employee ...

PS: we move away from suet : Lol:, but when two developers share their way of working, we cannot prevent them from changing !! : Lol: : Lol:
0 x
User avatar
muzo_31
I understand econologic
I understand econologic
posts: 85
Registration: 07/10/05, 17:11




by muzo_31 » 09/01/06, 12:20

Ah .... and your words only ignite even more questions for me .... in fact technically, all the same except that I am more in the hard than you, more to tickle the little totor, the kw , and the switching spike rather than the embedded linux, although I understand all this language, but do not share it by taste.

Where I am wondering is that I want more and more to become independent, but afraid to let go ... I already do a lot of projects for industrialists.

can we chat off-line? so as not to rot this econology subject anyway. Send me an email in MP.
0 x
User avatar
PITMIX
Pantone engine Researcher
Pantone engine Researcher
posts: 2028
Registration: 17/09/05, 10:29
x 17




by PITMIX » 09/01/06, 13:06

In any case, thank you again. For me it seems complicated what you do but I find your approach cool for those who want to put a controller of conso on their car. Too bad I won't be able to take advantage of it.

By the way, once your device is at the "nlc" point, how will those who want to take advantage of it get it?
0 x
User avatar
nlc
Econologue expert
Econologue expert
posts: 2751
Registration: 10/11/05, 14:39
Location: Nantes




by nlc » 09/01/06, 13:20

Well I would put the schemas and manufacturing plan on my site, as well as the source codes.
Most DIY enthusiasts can do it themselves. Otherwise for the others, I don't know! A cheap kit can be?

muzu_31: I don't do embedded linux ....
You actually seem more in power. I do a lot of hard, since I design the cards, but not too much power. And actually a lot of software.
0 x

 


  • Similar topics
    Replies
    views
    Last message

Back to "Water injection in the engines: the assembly and experimentation"

Who is online ?

Users browsing this forum : No registered users and 148 guests