Yeah, what Jon said! :-p I'm assuming that you need something to control an engine at 2kHz (12 kRPM). Assuming you want 1 degree accuracy in response, that means a responsiveness at about 720 kHz, while handling multiple inputs. I don't think you want to do that with unassisted CPU.
An MCU with tons of peripherals seem more appropriate, even if the core is runing at a more stately pace. Doing it on a TI Omap (Beaglebone) sounds much more reasonable, but I'd still be a little wary without a detailed timing analysis. As for reliability... This is going in a car that shakes rattles and rolls, and bakes and freezes? The motherboard probably will not survive for much more than a year, unless you spec a ruggedized industrial one. On Jun 14, 2012 7:27 PM, "Jon Elson" <[email protected]> wrote: > Joseph Chiu wrote: > > An engine controller? That seems like the last place you'd want this. > > Latency/jitter scares me, as does the idea of a crashed controller > because > > the hardware isn't robust enough. > > > Well, I think you really need some attached hardware, and that could have a > watchdog timer to shut down if the computer/program fails. At high RPM, > things are happening way too fast for direct CPU control, things like > ignition and injection timing. Some triggered counter/timers and PWM > modules could do what you need. I'd choose an FPGA, but I suspect you > can get add-on chips that can do these functions. Possibly something like > the Beagle Bone with an additional board would do it. But, of course, > no RT on that, yet. > > Jon > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
