DIYEFI.org Forum

Thanks for the link, I saw it somewhere (you probably did show me it before). Okay, the PWM is working, it was a just mix of a bridge and and dumb mistake. The transistor saturates nicely, and holds at 1A. The injector never reaches the 4A peak, but I don't really care about that. This is Vce, you c...

See it yourself: http://www.national.com/ds/LM/LM1949.pdf page 10 :-) It play a role in the frequency and look of the PWM, I see it as a configuration resistor. Current measuring R is 0.1ohm. Oh, and second scope shot, its Vce, 5v/div. You can see that the transistor has a Vce drop of nearly 5v at 2...

This is exactly what it is doing:



10 msec ON, 20 msec OFF

And yes, as Jared said, pwm should be working in 48hs :-)

Fred wrote:

nitrousnrg wrote:CoOS

I can't find the source repository for it, only a zip download, any idea where it is?

Noope, I have the same .zip you have. I recall it was a work made by a couple of guys for a thesis, and it went opensource, but I didn't hear about collaborations in that time.

Before further chattery goes on, here's some specs about the testing I made: These are the CNG injectors I used http://www.europegas.pl/documents/VALTEK_tech_spec.pdf https://lh3.googleusercontent.com/-nW8tW0KbgVs/TgCv0SOl3QI/AAAAAAAAAu4/0pQvWs_EiI4/s640/DSCF0293.JPG Briefly: 3ohm,4.5msec to reach p...

This whole PWM thing and its results deserves his own thread. Briefly, its an mbed running an rtos, powered by the SMPS that has been under testing. the pcb is just crap, but enough for making a point wether it is a good or an awful setup. Pics of how it was last week at the bottom of this https://p...

Thats fair. I pushed some changes a while ago, if there are doubs, ask:)
I recall adding 3.3k resistors for the leds and changing the power mosfets and XOR because they were out of stock.

A new chip from analog: http://www.analog.com/static/imported-files/data_sheets/AD8494_8495_8496_8497.pdf It has a 5mV/°C, so with 5v it can reach 1000°C, its enough for the cars I used, but maybe not enough for turbo cars. Another one is the MAX31855 http://datasheets.maxim-ic.com/en/ds/MAX31855.pd...

Thanks, thanks :-)

I failed miserably when I tried to make a reverse tunnel, but I checked that I've access to my machine from the university, so this should work for what I want.

If it is what I recall, it was a good link.

Sorry Fred, but I didn't saw you decided between one scheme and the other. You understood the good reasons to make the change, and gave an accurate example (to use the big reg for vref), but you said your board was working ok when you used it. What I really overlooked is the "hard limitation&qu...