DIYEFI.org Forum

This is awesome. You can present a logical premise, ask for input and come to a reasonable consensus in 2 pages! If only it were like this other places. I expected jharvey and a couple others to chime in, but not yet. I wonder why.

Gearhead

also note that the vnd5n07 curves and tables are mostly rated with a 10V input. A FET driver with 4A capability (overkill) which operates off a 12V rail will allow us to operate the fet in a region where the data exist for prediction of its operation. I was willing to try a buffer, but the more I th...

I do not think that burning of the FETs will be an issue for an ECU. Since the switching freq is very low, the FET will hardly heat up. I have an App where I am switching current through a heater, ~1A, at 96khz. The FET gets hot, maybe 80 degrees celcius, if I was switching in the 1khz range or low...

I'll have a look at other logic level FETs to see if the numbers look similar. In any case, a FET driver is probably a good idea but I'd be curious to see if a 5V buffer/driver would be sufficient. However, that might require a heftier 5V power supply. The need for a heftier 5V is what drives me to...

I recently upgraded my MS2 to Jean's code that runs sequential injection. I noticed that I needed about 10% more req fuel to achieve similar AFRs at idle. At load, it was also *different* and I am trying to characterize that more effectively. Also, at work I was dealing with a fet driving a brushed ...

Group, I have just finished a similar modification. When I build a V3 board, I do not install the current limiting nor the PWM circuitry, so this modification to take to power ground off the board is simplified substantially. I use a PWM valve and needed to take this to the power ground as well. I w...

Wooo Hooo!. This is a fantastic idea. I never really thought about it, but then again I am not a true developer, anyway. Yes, Yes, Yes. We absolutely need to have 3 different reserved areas that we write to when we flash something. 1) Code, 2) calibration (inc files) 3) Tuning data. Wouldn't it be a...

don't forget the bit registers, too. we want to know which mode it is in. Crank, Warmup, Run, Idle control, etc...

KeithG

what about the anodes of D6 and D20? Shouldn't these be pulled off the ground plane as well? Also, if you do not install the current limiting stuff (Note 1 on the schematics) or the PWM stuff (Note 3), the modifications become even less complicated or invasive. You do not have R37 or R38, nor do you...

The one thing to consider is what Ken said. He calls it setting DC directly. What it needs to do is know the max and min output values and start its loop with these values. If there is a bias curve or if a known good value is used as a starting point is not really that important. A portable PID loop...