I have never done it myself but I have heard of many people doing this. They get a can bus logger and log the data as they do various things in the vehicle, like brake, shift gears, etc. then they look at the data to what's changing. It's a grueling process but effective. My friend hooked up a logic analyzer that decodes can and figured out quite a fed codes on his iMiEV.
Sent from my iPhone > On Jan 3, 2017, at 2:02 AM, Marco Gaxiola via EV <[email protected]> wrote: > > I'm in the middle of a 2013 EV conversion project (well is not a very > recent), but as some of you may know; newer vehicles comes with more and > more electronics that operation of some devices and features of the vehicle > relies on the ICE data and information being generated by the ECM (OEM > computer) thru the CAN Bus. > > When you convert a vehicle like this, you face some problems by the > abscence of the running engine such: > - non electric powered steering. > - non operation of the AC unit (assuming the AC compressor and everything > is there like original). > - non working turn signals.(some models with digital turn signals) > - missing gauges on the instrument cluster like RPMs, speedometer, etc. > plus a bunch of red and amber known warning lights on. (and of course a lot > of DTC codes when reading the OBD port) > - etc... > > I tryed to find other threads about this subject but did not find any, at > least not recently. So I decided to post this one, hope that someone has > already face this problem and become able to fully convert newer models > without affect most OEM features from the vehicle. > > If someone has done this, please share your experience. But if not, let me > explain my thoughs and share your comments/feedback of what you think or > suggest me to do: > > - My first idea is to design a small PCB with a micro on it, that would > simulate most ot the analog and digital signals that the ECM needs from all > the sensors on the gas engine to keep it running like the water temperature > sensor, oil pressure, cranckshaft sensor, oxigen and manifold sensors (MAF > and MAP), etc. My theory is that this could be a simple way (since most > sensors are analog 0-12V, 0-5V of On/off outputs) that are not so complex > to emulate, and doing this way; the ECM would believe the ICE is there > running all fine and perfectly. > > Of course, the algorithm and maybe some of the simulated PCB outputs > would have to be changed on every different model of vehicle. (every > manufacturer uses many different sensors). But it would be a nice device if > same vehicle is beeing converted, like in a fleet project. > > - The second thing, would be to go on a higher leve of > microcomputer-microcontroller design that would allow to talk to many of > other units on the vehicle thru the CAN bus, trying to replace those > specific commands and data generated by the ICE, needed by those devices to > correctly operate, Such RPM and speed for the electric power steering as > example. > > The challenge here would be that, like the one before; every model and > vehicle brand, has propietary CAN communication protocols that would be a > monumental job to reverse engineer and interpret those codes, isn't it? > > > I'm not so familiar with automotive CAN procols altough I undestand CAN bus > at the communication/physical level. > > Any thougths or suggestions? > > > Marco Gaxiola > EnergyEV.com > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20170103/4914d072/attachment.htm> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
