From Diy_Efi-Owner Thu May 12 12:51:53 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA05816; Thu, 12 May 94 12:51:53 GMT Received: from slopoke.mlb.semi.harris.com by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo/wrapper resend -p bulk -M 10000 -l Diy_Efi -f Diy_Efi-Owner -h coulomb.eng.ohio-state.edu -s -r DIY_EFI diy_efi-outgoing id AA05810; Thu, 12 May 94 08:51:50 -0400 Received: from billy.mlb.semi.harris.com by slopoke.mlb.semi.harris.com (4.0/SMI-4.0) id AA17561; Thu, 12 May 94 08:51:48 EDT Received: by billy.mlb.semi.harris.com (4.1/SMI-4.1-jmb) id AA05991; Thu, 12 May 94 08:51:47 EDT Date: Thu, 12 May 94 08:51:47 EDT From: jws@mlb.semi.harris.com (James W. Swonger) Message-Id: <9405121251.AA05991@billy.mlb.semi.harris.com> To: DIY_EFI Subject: Re: Crank Position via Hall Effect Sender: Diy_Efi-Owner Precedence: bulk Reply-To: DIY_EFI The magnet on the f'wheel will give a narrower pulse and, with an inductive pickup, a larger signal. A Hall device will not see a larger amplitude, just a shorter width. The angular precision will be greater for a given magnet diameter as the radius increases. I would look for one of the newer magnet materials (SmCo, NdFeB, etc) rather than the ceramic or AlNiCo types. There are pretty amazing differences in field strength. There are also significant differences in materials' behavior at higher temperatures, so check that out before you pick one. From Diy_Efi-Owner Thu May 12 15:04:11 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA06581; Thu, 12 May 94 15:04:11 GMT Received: from localhost.eng.ohio-state.edu by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo/wrapper resend -p bulk -M 10000 -l Diy_Efi -f Diy_Efi-Owner -h coulomb.eng.ohio-state.edu -s -r DIY_EFI diy_efi-outgoing id AA06575; Thu, 12 May 94 11:04:09 -0400 Message-Id: <9405121504.AA06575@coulomb.eng.ohio-state.edu> To: DIY_EFI Subject: Re: Crank Position via Hall Effect In-Reply-To: Your message of "Thu, 12 May 94 08:51:47 EDT." <9405121251.AA05991@billy.mlb.semi.harris.com> Date: Thu, 12 May 94 11:04:08 -0400 From: John S Gwynne Sender: Diy_Efi-Owner Precedence: bulk Reply-To: DIY_EFI -------- In message <9405121251.AA05991@billy.mlb.semi.harris.com> , you write: | The magnet on the f'wheel will give a narrower pulse and, with an inductive | pickup, a larger signal. A Hall device will not see a larger amplitude, | just a shorter width. Yes, I agree... | The angular precision will be greater for a given magnet diameter as the | radius increases. No, I don't agree. /\ inductive pickup -------/ \ /------------ \/ |------| Hall device -------| |----------- (w/ high gain) ^ | center of magnet For an inductive pickup we look for the zero crossing (in voltage) with either a positive or negative slope depending on the coil connection. The larger the magnet, the longer the rise and fall times. But the location of the zero crossing has not changed! It's *always* in the center were the B field through the device changes slope and starts decreasing. For a Hall effect device we look for a rising or falling edge. In either case the size of the magnet makes *no* difference; however the placement does. You can also buy ring magnets with multiple pole pairs. Each pole pair would produce one pulse. John S Gwynne Gwynne.1@osu.edu _______________________________________________________________________________ T h e O h i o - S t a t e U n i v e r s i t y ElectroScience Laboratory, 1320 Kinnear Road, Columbus, Ohio 43212, USA Telephone: (614) 292-7981 * Fax: (614) 292-7292 ------------------------------------------------------------------------------- From Diy_Efi-Owner Thu May 12 22:25:33 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA09979; Thu, 12 May 94 22:25:33 GMT Received: from aces1.acenet.auburn.edu by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo/wrapper resend -p bulk -M 10000 -l Diy_Efi -f Diy_Efi-Owner -h coulomb.eng.ohio-state.edu -s -r DIY_EFI diy_efi-outgoing id AA09973; Thu, 12 May 94 18:25:31 -0400 Received: from aces6.acenet.auburn.edu by acenet.auburn.edu (4.1/SMI-4.1 aces1 1.0) id AA02178; Thu, 12 May 94 17:25:29 CDT Date: Thu, 12 May 94 17:25:29 CDT From: Gregory A. Parmer Message-Id: <9405122225.AA02178@acenet.auburn.edu> To: DIY_EFI Subject: re: Crank Position Cc: gparmer@acenet.auburn.edu X-Sun-Charset: US-ASCII Sender: Diy_Efi-Owner Precedence: bulk Reply-To: DIY_EFI I had intended to just listen in and see what I could learn about about EFIs, but suddenly I've got to throw in some suggestions/comments/questions that I had previously thought were obvious. A key question is "how many possible variations are you/we planning on designing here?" I would hope that the system will be designed in modules of some sort so that the type of sensors used can vary. It shouldn't really matter whether a person wants to use the toothed wheel or the flying magnets, and it shouldn't matter whether it's attached to the harmonic balancer or the flex plate. Opinions are sure to differ about such specifics. A reasonable design should take this into account, and allow several options, IMHO. > | The angular precision will be greater for a given magnet diameter as the > | radius increases. > > No, I don't agree. > ...... > of the magnet makes *no* difference; however the placement does. You can also > buy ring magnets with multiple pole pairs. Each pole pair would produce one > pulse. This is way over my head, but my thoughts are these. If you use four magnets (assuming V8 here) that are all just alike it won't matter whether the trigger occurs at the beginning or the end of the pulse, just that it occurs at the same point for each of the four magnets. Adjustments of the trigger mechanism *relative to crankshaft position* (an obvious requirement) makes the point moot about the exact relationship of the magnet and sensor at the time of the trigger. Where precision becomes a real issue is in the placement of the magnets. If I understand the discussion correctly and you intend to use several magnets to sense crankshaft position then the *distribution* of these magnets around the harmonic balancer or flexplate is where the precision factor gets tricky. It'll be *much* easier to accurately space four magnets at 90 degree intervels around a flywheel or flexplate than around a harmonic balancer. If you miss by 1/4" on a 7" HB you'll be out ~4 degrees, but the same error on a 24" flyweel results in only 1 degree of error. The math is probably off, but you get the picture. I would think the diameter of the magnet itself is irrelevant but that the diameter of the wheel they're attached to is *very* relevant. Preparing a spot in the sand to bury my ignorant head, :) -greg Greg Parmer INTERNET: gparmer@acenet.auburn.edu Lead Specialist, Network Support VOICE: (205) 844-9660 Alabama Cooperative Extension Service FAX: (205) 844-3501 Auburn University, AL 36849-5646 From Diy_Efi-Owner Thu May 12 22:42:43 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA10030; Thu, 12 May 94 22:42:43 GMT Received: from localhost.eng.ohio-state.edu by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo/wrapper resend -p bulk -M 10000 -l Diy_Efi -f Diy_Efi-Owner -h coulomb.eng.ohio-state.edu -s -r DIY_EFI diy_efi-outgoing id AA10024; Thu, 12 May 94 18:42:41 -0400 Message-Id: <9405122242.AA10024@coulomb.eng.ohio-state.edu> To: DIY_EFI Cc: jsg Subject: Re: In-Reply-To: Your message of "11 May 94 10:32:11 PDT." <9405111630.AA01715@coulomb.eng.ohio-state.edu> Date: Thu, 12 May 94 18:42:41 -0400 From: John S Gwynne Sender: Diy_Efi-Owner Precedence: bulk Reply-To: DIY_EFI In message <9405111630.AA01715@coulomb.eng.ohio-state.edu> , you write: | Well, John, I for one am interested in using your circuit! How can you tell | us | more info? Is there a place where you could post the sch. and GAL equations? .... | - Steven Ciciora I'm in the process of taking my general exams now. When I finish this in another week or two, I'll take the time to write it up and post (I intend to do this in HTML for viewing with Mosaic or some other WWW browser). John S Gwynne Gwynne.1@osu.edu _______________________________________________________________________________ T h e O h i o - S t a t e U n i v e r s i t y ElectroScience Laboratory, 1320 Kinnear Road, Columbus, Ohio 43212, USA Telephone: (614) 292-7981 * Fax: (614) 292-7292 ------------------------------------------------------------------------------- From Diy_Efi-Owner Fri May 13 15:03:32 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA13750; Fri, 13 May 94 15:03:32 GMT Received: from hwking.cca.rockwell.com by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo/wrapper resend -p bulk -M 10000 -l Diy_Efi -f Diy_Efi-Owner -h coulomb.eng.ohio-state.edu -s -r DIY_EFI diy_efi-outgoing id AA13744; Fri, 13 May 94 11:03:29 -0400 Received: by hwking.cca.rockwell.com (5.65/DEC-Ultrix/4.3) id AA03658; Fri, 13 May 1994 10:03:26 -0500 Received: by ohura.cca.rockwell.com (5.65/DEC-Ultrix/4.3) id AA00584; Fri, 13 May 1994 10:03:24 -0500 Message-Id: <9405131503.AA00584@ohura.cca.rockwell.com> To: DIY_EFI Subject: EFI mailing list Date: Fri, 13 May 94 10:03:24 -0500 From: sdbartho@cca.rockwell.com X-Mts: smtp Sender: Diy_Efi-Owner Precedence: bulk Reply-To: DIY_EFI Hiya, I'm interested in EFI. How do I sign up? Dig __&__ _________________________________ / \ / Scott D. Bartholomay \ | | / Rockwell International \ | (o)(o) / Collins Air Transport Division \ c .---_) / Cedar Rapids, Iowa 52402 \ | |.___| __/ INTERNET: sdbartho@pobox.cca.rockwell.com \ | \__/ \ (319) 395-4498 / /_____\ \ I look pretty young but I'm just / /_____/ \ \ backdated ... / / \ \ -The Who / \ The opinions expressed here are far / \ too bizarre to be that of Rockwell / \__________________________________/ From Diy_Efi-Owner Fri May 13 16:33:12 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA14836; Fri, 13 May 94 16:33:12 GMT Received: from kappa.jp.Pima.GOV by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo/wrapper resend -p bulk -M 10000 -l Diy_Efi -f Diy_Efi-Owner -h coulomb.eng.ohio-state.edu -s -r DIY_EFI diy_efi-outgoing id AA14830; Fri, 13 May 94 12:33:06 -0400 Received: from smtpsc1.sc.pima.gov by KAPPA.JP.PIMA.GOV (MX V3.3 VAX) with SMTP; Fri, 13 May 1994 09:38:59 MST Received: from cc:Mail by smtpsc1.sc.pima.gov id AA768846815 Fri, 13 May 94 09:33:35 mst Date: Fri, 13 May 94 09:33:35 mst From: Terrill_Yuhas@smtpsc1.sc.pima.gov Encoding: 236 Text Message-Id: <9404137688.AA768846815@smtpsc1.sc.pima.gov> To: DIY_EFI Subject: Re: EFI mailing list Sender: Diy_Efi-Owner Precedence: bulk Reply-To: DIY_EFI New to the mailing list concept so if I'm doing something wrong, I apologize. I would like to get on your mailing list though. Thanks! Terrill Yuhas Terrill_Yuhas@smtpsc1.sc.pima.gov From Diy_Efi-Owner Fri May 13 17:34:14 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA15405; Fri, 13 May 94 17:34:14 GMT Received: from chaph.usc.edu by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo/wrapper resend -p bulk -M 10000 -l Diy_Efi -f Diy_Efi-Owner -h coulomb.eng.ohio-state.edu -s -r DIY_EFI diy_efi-outgoing id AA15399; Fri, 13 May 94 13:34:12 -0400 Received: from aludra.usc.edu (eherbulo@aludra.usc.edu [128.125.253.134]) by chaph.usc.edu (8.6.8.1/8.6.4) with ESMTP id KAA10037 for ; Fri, 13 May 1994 10:34:10 -0700 Received: (eherbulo@localhost) by aludra.usc.edu (8.6.8.1/8.6.7+ucs) id KAA00921 for DIY_EFI@coulomb.eng.ohio-state.edu; Fri, 13 May 1994 10:34:09 -0700 Date: Fri, 13 May 94 10:34:08 PDT From: Ed Herbulock To: DIY_EFI Subject: Sign me up! Message-Id: Sender: Diy_Efi-Owner Precedence: bulk Reply-To: DIY_EFI Please sign me up to your EFI mailing list, Thanks, Ed. From Diy_Efi-Owner Sat May 14 03:28:58 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA19771; Sat, 14 May 94 03:28:58 GMT Received: from leonis.nus.sg by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo/wrapper resend -p bulk -M 10000 -l Diy_Efi -f Diy_Efi-Owner -h coulomb.eng.ohio-state.edu -s -r DIY_EFI diy_efi-outgoing id AA19765; Fri, 13 May 94 23:28:54 -0400 Received: from localhost (isc36209@localhost) by leonis.nus.sg (8.6.4/8.6.4/CNS-2.0) id LAA26214; Sat, 14 May 1994 11:28:49 +0800 Date: Sat, 14 May 1994 11:27:35 +0800 (SST) From: Lee Hong Yeow Subject: Mailing List To: DIY_EFI Message-Id: Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: Diy_Efi-Owner Precedence: bulk Reply-To: DIY_EFI Hi there... Can I please be included in the EFI mailing list? TIA. .Eric Lee. From Diy_Efi-Owner Sun May 15 02:15:48 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA25500; Sun, 15 May 94 02:15:48 GMT Received: from eigen.ee.ualberta.ca by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo/wrapper resend -p bulk -M 10000 -l Diy_Efi -f Diy_Efi-Owner -h coulomb.eng.ohio-state.edu -s -r DIY_EFI diy_efi-outgoing id AA25494; Sat, 14 May 94 22:15:46 -0400 Message-Id: <9405150215.AA25494@coulomb.eng.ohio-state.edu> Received: by eigen.ee.ualberta.ca (1.37.109.4/15.6) id AA17789; Sat, 14 May 94 20:15:43 -0600 From: Dale Ulan Subject: re: Crank Position To: DIY_EFI Date: Sat, 14 May 94 20:15:41 MDT In-Reply-To: <9405122225.AA02178@acenet.auburn.edu>; from "Gregory A. Parmer" at May 12, 94 5:25 pm Mailer: Elm [revision: 70.85] Sender: Diy_Efi-Owner Precedence: bulk Reply-To: DIY_EFI > to the harmonic balancer or the flex plate. Opinions are sure to differ > about such specifics. A reasonable design should take this into account, > and allow several options, IMHO. Sounds like the TPU on the 68332A would work quite well for this application. Also, you can usually get aftermarket pickups for engines.... for the magnetic crank sensor triggered coil ignitions. I can't remember who made these. Also, a favorite of car companies now is the multi-tooth wheel with an extra or missing tooth. The 68332A has a TPU function that decodes this and interpolates the angle in between position pulses. From this, the TPU can fire ignition and injection pulses with no problem. I believe you can also have a separate cam position sensor to sync SEFI. I haven't tried setting up a 68332A yet, but I've been working on some code that I will be able to try once I get the parts. The TPU looks much more complicated than it is, since the included TPU functions are quite nice for many applications... especially engine control. -Dale From Diy_Efi-Owner Mon May 16 13:27:22 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA01285; Mon, 16 May 94 13:27:22 GMT Received: from mailsrvr.az05.bull.com by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo/wrapper resend -p bulk -M 10000 -l Diy_Efi -f Diy_Efi-Owner -h coulomb.eng.ohio-state.edu -s -r DIY_EFI diy_efi-outgoing id AA01279; Mon, 16 May 94 09:27:16 -0400 Received: from abc.az05.bull.com by mailsrvr.az05.bull.com with SMTP (5.65c/090393) id AA26863; Mon, 16 May 1994 06:24:59 -0700 Received-Date: Mon, 16 May 1994 06:24:59 -0700 Received: by abc.az05.bull.com (AIX 3.2/UCB 5.64/4.03.01) id AA25410; Mon, 16 May 1994 06:24:31 -0700 Date: Mon, 16 May 1994 06:24:31 -0700 From: blawranc@abc.az05.bull.com (Bill Lawrance) Message-Id: <9405161324.AA25410@abc.az05.bull.com> To: DIY_EFI Subject: EFI Cc: blawranc@abc.az05.bull.com Sender: Diy_Efi-Owner Precedence: bulk Reply-To: DIY_EFI I'm interested in the subject mentioned in the posting in rec.autos.tech. Thanks, William Lawrance W.Lawrance@az05.bull.com From Diy_Efi-Owner Mon May 16 19:31:23 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA04378; Mon, 16 May 94 19:31:23 GMT Received: from timbuk.cray.com by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo/wrapper resend -p bulk -M 10000 -l Diy_Efi -f Diy_Efi-Owner -h coulomb.eng.ohio-state.edu -s -r DIY_EFI diy_efi-outgoing id AA04372; Mon, 16 May 94 15:31:18 -0400 Received: from ferrari (ferrari-gate.cray.com) by cray.com (Bob mailer 1.2) id AA07415; Mon, 16 May 94 14:31:15 CDT Received: from ferrari05.benchmark by ferrari (5.0/CRI-5.14) id AA26794; Mon, 16 May 1994 14:31:35 +0600 Received: by ferrari05.benchmark (5.0/SMI-SVR4) id AA00686; Mon, 16 May 1994 14:27:25 +0600 From: cmfb@ferrari.cray.com (Chris Bone) Message-Id: <9405161927.AA00686@ferrari05.benchmark> Subject: DIY_EFI To: DIY_EFI Date: Mon, 16 May 1994 14:27:24 -0500 (CDT) X-Mailer: ELM [version 2.4 PL23] Content-Type: text Content-Length: 236 Sender: Diy_Efi-Owner Precedence: bulk Reply-To: DIY_EFI Read the mail in rec.autos.misc - I am interested in the mail list, please add my name. Regards, -- __ / ) / / /_ __ o _ (__/ / /_/ (_/_/_)_ Z*Mail - Simm-City for all platforms From Diy_Efi-Owner Tue May 17 15:52:11 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA07775; Tue, 17 May 94 15:52:11 GMT Received: from pine.cse.nau.edu by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo/wrapper resend -p bulk -M 10000 -l Diy_Efi -f Diy_Efi-Owner -h coulomb.eng.ohio-state.edu -s -r DIY_EFI diy_efi-outgoing id AA07768; Tue, 17 May 94 11:52:04 -0400 Received: (from met@localhost) by pine.cse.nau.edu (8.6.9/2.2-nau) id IAA03620 for diy_efi@coulomb.eng.ohio-state.edu; Tue, 17 May 1994 08:52:03 -0700 Message-Id: <199405171552.IAA03620@pine.cse.nau.edu> From: met@pine.cse.nau.edu (MTN-KAT) Date: Tue, 17 May 1994 08:52:02 -0700 X-Mailer: Mail User's Shell (7.2.5 10/14/92) To: diy_efi Subject: Speed/density interface Sender: Diy_Efi-Owner Precedence: bulk Reply-To: DIY_EFI The list has slowed considerably with the end of school, hopefully there are still enough of us to continue this project. :) I must run a s/d setup due to my use of two separate intake ducts. I am separating the left and right banks of a Ford FE big block. I'm doing this pretty much for asthetics and simplicity. I will have two identical intake ducts with a s/d unit mounted in one duct and a dummy or maybe a second unit that my processor can switch back and forth from/to. I'll be running ~600Hp with natural aspiration and am considering forced induction of some sort. I need to know how this signal is processed. I don't have access to nor am I familiar with ocsilliscopes to get a picture myself. The signal is analog but is it linear and would it be better to design a learning function or can I setup a curve fitting formula? The advertisments always specify injector flow rates as being the criterion for how they schedule the s/d unit. Could someone with more knowledge of this subject enlighten me please? Millam From Diy_Efi-Owner Tue May 17 16:10:17 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA07936; Tue, 17 May 94 16:10:17 GMT Received: from pine.cse.nau.edu by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo/wrapper resend -p bulk -M 10000 -l Diy_Efi -f Diy_Efi-Owner -h coulomb.eng.ohio-state.edu -s -r DIY_EFI diy_efi-outgoing id AA07930; Tue, 17 May 94 12:10:12 -0400 Received: (from met@localhost) by pine.cse.nau.edu (8.6.9/2.2-nau) id JAA04010 for diy_efi@coulomb.eng.ohio-state.edu; Tue, 17 May 1994 09:10:11 -0700 Message-Id: <199405171610.JAA04010@pine.cse.nau.edu> From: met@pine.cse.nau.edu (MTN-KAT) Date: Tue, 17 May 1994 09:10:10 -0700 X-Mailer: Mail User's Shell (7.2.5 10/14/92) To: diy_efi Subject: Modularity, not platform should be the idea. Sender: Diy_Efi-Owner Precedence: bulk Reply-To: DIY_EFI This is just my opinion of course but... I am going to use the 6811, some people are going to use a miniboard, others will use whatever. I think that there has been too mush worry about which platform we should ALL use. If we do this in modules then everyone can apply the modules as is pertinent to their individual needs and desires. I realize that there are some who are EE who don't have programming and some CSE who don't have electronics. These are pretty small problems as far as I can see. We are to work as a team on this project, the EE's can design the electronics and the CSE's can do their thing. As far as what is needed for this project, we can do it all if we have everyone do a piece. One or two people can work on this sensor input or that crank position idea or some other bit. I noticed that there were some people who got all worked up with the idea that we must do this as one big spaghetti deal, kinda like BASIC programming. Everyone who has taken programming has been taught modularity, lets apply this to our project. I'll tackle the crank trigger and my idea for a digital logic board that only requires 4 bits to operate the 8 or 16 injectors that I am considering using. 8 injectors for gasoline and 16 for Alky, which I'd really like to use. The digital board will be completely portable and I also have an idea to have it parse the signals so that only 2 bits will be required to run 16 injectors. If you are running less than 8 cylinders it is very easy to set it up for as few or as many cylinders as you need. Millam From Diy_Efi-Owner Tue May 17 17:41:41 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA09030; Tue, 17 May 94 17:41:41 GMT Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) for /usr/local/mail/majordomo/wrapper resend -p bulk -M 10000 -l Diy_Efi -f Diy_Efi-Owner -h coulomb.eng.ohio-state.edu -s -r DIY_EFI diy_efi-outgoing id AA09015; Tue, 17 May 94 13:41:39 -0400 Date: Tue, 17 May 94 13:41:39 -0400 From: jsg (John S Gwynne) Message-Id: <9405171741.AA09015@coulomb.eng.ohio-state.edu> Apparently-To: DIY_EFI Sender: Diy_Efi-Owner Precedence: bulk Reply-To: DIY_EFI (Message jsg:141) Received: from wotan.compaq.com by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/lib/mh/slocal -user jsg id AA08591; Tue, 17 May 94 12:53:18 -0400 Received: from twisto.eng.hou.compaq.com by wotan.compaq.com with smtp (Smail3.1.28.1 #6) id m0q3SLe-0002cpC; Tue, 17 May 94 11:50 CDT Received: from bangate.compaq.com by twisto.eng.hou.compaq.com with smtp (Smail3.1.28.1 #8) id m0q3SLe-000pdAC; Tue, 17 May 94 11:50 CDT Message-Id: Received: by bangate.compaq.com with VINES ; Tue, 17 May 94 11:50:31 CDT Date: Tue, 17 May 94 11:36:53 CDT From: Steve=Ravet%Prj=Eng%PCPD=Hou@bangate.compaq.com Subject: re: Modularity, ... and pre-ignition To: twisto.eng.hou.compaq.com!wotan!coulomb.eng.ohio-state.edu!Diy_Efi-Owner Cc: met@pine.cse.nau.edu (MTN-KAT) Wrote: | | [paragraph about modularity deleted, EEs do their part, CS people do their part, etc.] Makes sense. Discussion has fallen off somewhat, I guess because the schools are between semesters? Anyone out there not in school? | I'll tackle the crank trigger and my idea for a digital logic | board that only | requires 4 bits to operate the 8 or 16 injectors that I am | considering using. | 8 injectors for gasoline and 16 for Alky, which I'd really like | to use. | The digital board will be completely portable and I also have an | idea to have | it parse the signals so that only 2 bits will be required to run | 16 injectors. | If you are running less than 8 cylinders it is very easy to set | it up for as | few or as many cylinders as you need. Ok, now we need some way of posting schematics, etc. Is there a site we can use, and what format should we use? I would guess that postscript is the best general purpose format for graphics. Previewers and converters are available for most platforms. In addition, postscript can directly drive a high-resolution printer to make etching masks, etc. Back to real stuff: One person replied to my post about pre-ignition detection, saying that it showed up from 5-8khz. What sort of detector would work to pick up this signal? piezo-electric tape is easy, just stick it on, but it might have problems with the heat, and it may not have the correct frequency response. how about commercial detectors? are there sources for them, how much do they cost, and can they be easily interfaced? once a detctor is found, what is the control algorithm for the ignition? the simplest seems to be to continually advance the ignition until pre-ignition is detected, then retard it a little. would this give the most power? or is more feedback required, like maybe an exhaust monitor? inquiring minds want to know.... Those of us who are still here, lets keep the list going..... --steve