DIYEFI.org Forum

The Toyota EDU might serve for other apps. Anyone know more - inputs, outputs, voltages, # channels, currents, models/years used, etc? No sense in building something if there is something reasonable out there.

Toyota diesels have something called the EDU that sits between the ECU and the injectors. Anyone know more about this? It could be what is needed in terms of drive circuit.

Just curious - why LPG? I use partial CNG (because it is cheap and clean). But some areas don't sell it.

I've done some more thinking about what would be needed for a generic DI driver and have some thoughts about some mosfets, 75V and 12V supplies and a tiny/cheap cpu to do timing and PWM current control. Probably a separate board that would have just one line per injector as input. Diesels have simil...

> I am writing my own ...

I think the first word answers my question.

Based on the Taiwanese paper, min pulse width is 1200 usec, suggesting 12 usec timing for 1% accuracy. That's easy to do with almost any CPU. Multiple pulses and PWM to control current might require 1 usec. Still doable for a reasonable cpu and code although you might not get anything else done. As ...

http://delphi.com/manufacturers/auto/po ... /ecm/idm2/
http://sine.ni.com/apps/utf8/niaa.ind_p ... l_id=26028

Sounds like you want to focus on the level of an early 80's engine controller (I know since I was there programming them). Probably a good first step, but I would always be looking towards the future and take opportunistic advantage of any easy steps towards getting there. If you say "DI is som...

Without going to look, I'd say that the first option to increase max fuel flow in a DI car is to increase fuel pressure. Second is to switch to injectors from the same manufacturer but designed for a larger engine. Both need ECU changes (or replacement :-)). Let's say that diesel can use multiple pu...

I should mention floating point constant to bin point conversions look slightly different:

#define PI (unsigned long) (3.1415926 * (1<<16)) // PI bin 16

No speed hit because the compiler does the work and it doesn't trigger any floating point work during run time.