Search found 158 matches
- Thu Dec 19, 2013 12:53 pm
- Forum: Fledgling Designs
- Topic: Karri's "Wildcat" EMS for ModICE enclosure
- Replies: 25
- Views: 58968
Re: Karri's "Wildcat" EMS for ModICE enclosure
I don't think a 150 dollar ignition module should be a deal breaker in a performance engine build, but just for the benefit of those wanting to keep the original equipment, I guess a concession could be made. How about an ORing schottky for +5v and an externally switched FET driver for +12v(ground a...
- Tue Dec 03, 2013 4:48 pm
- Forum: Fledgling Designs
- Topic: Karri's "Wildcat" EMS for ModICE enclosure
- Replies: 25
- Views: 58968
Re: Karri's "Wildcat" EMS for ModICE enclosure
I think the key difference is the Bosch unit is a triple-tier darlington vs. the regular two-tier; 22mA vs excess of 300. I guess the question boils down to this: I understand the reasons behind maximum flexibility, but it too is a coin with two faces. It increases the board complexity, it adds to t...
- Tue Dec 03, 2013 12:07 pm
- Forum: Fledgling Designs
- Topic: Karri's "Wildcat" EMS for ModICE enclosure
- Replies: 25
- Views: 58968
Re: Karri's "Wildcat" EMS for ModICE enclosure
Yeah, I read and acknowledged that FETs should be used. If it didn't come out in the text correctly I apologize. I'm a bit at loss here. Bosch datasheet states +5v signal on the darlington base. Then again I've read about the +12 volt needed on darlington here. So is the manufacturer wrong with the ...
- Tue Dec 03, 2013 8:26 am
- Forum: Fledgling Designs
- Topic: Karri's "Wildcat" EMS for ModICE enclosure
- Replies: 25
- Views: 58968
Re: Karri's "Wildcat" EMS for ModICE enclosure
Yeah, I got a little confused there for a minute. Of course the system isn't inverted; I guess I'm not at my sharpest at midnight anymore. Anyway, the actual transistor for the ignition module driver is going to be a FET and not some odd throughhole BJT. The provided schematic was a nice gesture fro...
- Mon Dec 02, 2013 10:26 pm
- Forum: Fledgling Designs
- Topic: Karri's "Wildcat" EMS for ModICE enclosure
- Replies: 25
- Views: 58968
Re: Karri's "Wildcat" EMS for ModICE enclosure
Figuring out the high current drives. So yeah, higher resistance internal resistance with IGBTs is bad for the injector response time with 12(14) volt system. Going for MOSFETs this time. The VNx14NV04 would indeed seem like the ideal choice, the TO-220 package version is VNP14NV04. The injector cir...
- Fri Nov 29, 2013 1:34 pm
- Forum: Fledgling Designs
- Topic: Karri's "Wildcat" EMS for ModICE enclosure
- Replies: 25
- Views: 58968
Re: Karri's "Wildcat" EMS for ModICE enclosure
No seriously, I want(need!) to know the problem with injectors and IGBT's. Datasheets and example projects don't seem to indicate such issues, in all it's pretty much a MOSFET input, BJT output type of deal. Flyback diode arrangement is different since there none inherently in the device, but extern...
- Fri Nov 29, 2013 5:21 am
- Forum: Fledgling Designs
- Topic: Karri's "Wildcat" EMS for ModICE enclosure
- Replies: 25
- Views: 58968
Re: Karri's "Wildcat" EMS for ModICE enclosure
Ah, so there was to summary of the available features. And as I thought, I have a couple of feature ideas without firmware support (yet?). The blank faceplate option was explored, turns out for all of the options headers (that I found) overlapped with the PCB holders on the faceplate, so that didn't...
- Thu Nov 28, 2013 9:43 pm
- Forum: Fledgling Designs
- Topic: Karri's "Wildcat" EMS for ModICE enclosure
- Replies: 25
- Views: 58968
Re: Karri's "Wildcat" EMS for ModICE enclosure
Hardware layout You don't design the board before doing the schematics, but the two do go somewhat hand in hand, and here's my take on the PCB layout. Top layer is for the really sensitive signals and most components, and is zoned for each function group; CPU is at the signal hub. The second layer i...
- Thu Nov 28, 2013 7:58 pm
- Forum: Fledgling Designs
- Topic: Karri's "Wildcat" EMS for ModICE enclosure
- Replies: 25
- Views: 58968
Karri's "Wildcat" EMS for ModICE enclosure
After a lengthy hiatus from most car-related activities (post-layoff blues and weariness and lack of funds with the engine build) I've decided to properly take on a FreeEMS HW implementation. To keep the feline themed naming, I though to use simple "Wildcat", googling "wildcat engine ...
- Fri Jun 08, 2012 1:11 pm
- Forum: FreeEMS Hardware Dev
- Topic: SPI Bus Sharing Stategies
- Replies: 32
- Views: 43493
Re: SPI Bus Sharing Stategies
About which devices to use SPI... basically, you want to keep SPI devices within the ECU enclosure. For remote equipment you'd want to use RS-485 or CAN. I had the idea about SPI addressing using a demux and buffer chips. What it'd do is you'd enter the bus address with an SPI message to the handler...