From owner-diy_efi Fri Oct 28 19:04:55 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA22071; Fri, 28 Oct 94 19:04:55 GMT Received: from wotan.compaq.com by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo-1.92/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 AA22066; Fri, 28 Oct 94 15:04:54 -0400 Received: from twisto.eng.hou.compaq.com by wotan.compaq.com with smtp (Smail3.1.28.1 #12) id m0r0wES-000vK4C; Fri, 28 Oct 94 13:40 CDT Received: from bangate.compaq.com by twisto.eng.hou.compaq.com with smtp (Smail3.1.28.1 #10) id m0r0wCf-000uIZC; Fri, 28 Oct 94 13:39 CDT Message-Id: Received: by bangate.compaq.com with VINES ; Fri, 28 Oct 94 13:33:20 CDT Date: Fri, 28 Oct 94 13:21:24 CDT From: Steve=Ravet%Prj=Eng%PCPD=Hou@bangate.compaq.com Subject: the diy-sbc To: diy_efi Cc: Sender: owner-diy_efi Precedence: bulk Reply-To: DIY_EFI Just got your schematic and printed it, good work. I have a couple questions: 1) what is the circuitry connected to IC9 pin1? Debounce for the switch? 2) what are your pal equations? also, a comment labeling each bus and what signals are on it would be nice. maybe put the pal equations on the schematic too? Anyway, it seems complete, what are your plans for enhancements? I mean on this board, not plans for expansion boards... --steve From owner-diy_efi Fri Oct 28 21:05:27 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA22432; Fri, 28 Oct 94 21:05:27 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-1.92/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 AA22427; Fri, 28 Oct 94 17:05:24 -0400 Message-Id: <9410282105.AA22427@coulomb.eng.ohio-state.edu> To: DIY_EFI Subject: Re: the diy-sbc In-Reply-To: Your message of "Fri, 28 Oct 94 13:21:24 CDT." Date: Fri, 28 Oct 94 17:05:24 -0400 From: John S Gwynne Sender: owner-diy_efi Precedence: bulk Reply-To: DIY_EFI -------- In message , you write: | 1) what is the circuitry connected to IC9 pin1? Debounce for the switch? The initial reset must be asserted for 100ms. It works but it can be replaced by a "reset generator" with fewer external parts. See below... | 2) what are your pal equations? appended to the end of this e-mail. | Anyway, it seems complete, what are your plans for enhancements? I mean on | this board, not plans for expansion boards... 1) ic10 and most of the discrete parts attached to it will be replaced with a MAXIM "watch-dog/battery switch over/reset generator". I hope to order this next week... 2) I need a few wait states for the external bus that will be on the expansion board. Right now this should just be an equation change to ic11, but I may add one connection between E1 and ic11. 3) In hind sight, I think ic13 and ic15 (the battery backed-up ram) should be put on the expansion board and 2 128kx8 SRAM chips put on this board. Originally, I was going to put 0.5 or 1 Meg of DRAM (SIMMs) on the expansion board, but this seems like too much over kill now. I intend to put 2 128kx8 SRAM chips on my expansion board. 4) A connection will be made between the reset generator and IC19 to ensure that the battery backed-up RAM can not be selected during the first few clock cycles of a power-on reset. 5) I made the following pin swaps to minimize wire path lengths. IC7: (pin as shown on the schematics),(was changed to new pin number) 2,9 3,8 4,7 5,6 6,5 7,4 8,3 9,2 18,11 17,12 16,13 15,14 14,15 13,16 12,17 11,18 IC2: 11,17 13,15 15,13 17,11 9,3 7,5 5,7 3,9 IC3: 11,17 13,15 15,13 17,11 9,3 7,5 5,7 3,9 6) The interrupt priority encoder and heart-beat 100mS interrupt should be on the cpu board to make it more stand-alone. But, (1) there are a limited number of pins free on E1 for other external interrupts and (2) not a whole lot of space left. Expect pins 23,24, and 25 of ic1 and pin 30 of ic17 to be routed to E1 with maybe pull-up resistor for stand-alone mode. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ GAL equations follow (all GAL's are 15nS) ================ cut here ================= ic9 file chip ic9 gal16v8a ;1 2 3 4 5 6 7 8 9 10 R1 nc nc nc R nc nc nc nc GND nc nc nc RESET1 W nc !RESET !HALT nc VCC equations RESET = !R1 HALT = !R1 RESET.OE = !R1 HALT.OE = !R1 RESET1 = RESET.PIN W = !R ================ cut here ================= ic11 file chip ic11 gal16v8a ;1 2 3 4 5 6 7 8 9 10 CLK24 !AS A23 A22 A21 NC NC NC NC GND NC NC NC NC NC CLK6 !DTACK !VPA CLK12 VCC equations CLK12 := !CLK12 CLK6 := !CLK6 & CLK12 | CLK6 & !CLK12 DTACK = AS & !A23 | AS & !A22 | AS & !A21 VPA = AS & A23 & A22 & A21 ================ cut here ================= ic19 file chip ic19 gal16v8a ;1 2 3 4 5 6 7 8 9 10 NC !UDS !LDS !AS A23 A22 A21 R NC GND NC NC NC !U_RD !U_WR !U_CS !HBRAM !LBRAM !EPRM VCC equations EPRM = AS & R & !A23 & !A22 & !A21 LBRAM = LDS & !A23 & !A22 & A21 HBRAM = UDS & !A23 & !A22 & A21 U_CS = !A23 & A22 & !A21 U_WR = LDS & !R & !A23 & A22 & !A21 U_RD = LDS & R & !A23 & A22 & !A21 ================ cut here ================= 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 owner-diy_efi Sat Oct 29 02:50:18 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA23321; Sat, 29 Oct 94 02:50:18 GMT Received: from eigen.ee.ualberta.ca by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo-1.92/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 AA23316; Fri, 28 Oct 94 22:50:15 -0400 Message-Id: <9410290250.AA23316@coulomb.eng.ohio-state.edu> Received: by eigen.ee.ualberta.ca (1.37.109.4/15.6) id AA14566; Fri, 28 Oct 94 20:49:59 -0600 From: Dale Ulan Subject: re: Re: EGO clogging. (long) To: DIY_EFI Date: Fri, 28 Oct 94 20:49:58 MDT In-Reply-To: ; from "Steve=Ravet%Prj=Eng%PCPD=Hou@bangate.compaq.com" at Oct 28, 94 10:47 am Mailer: Elm [revision: 70.85] Sender: owner-diy_efi Precedence: bulk Reply-To: DIY_EFI > EGO=oxygen sensor > UEGO=????? universal exhaust gas oxygen sensor. It is capable of sensing what the relative mixuture is, not just whether it's lean or rich of stoich. > I thought the O2 sensor generated voltage depending on amount of O2 in the > exhaust. sort of an exponential curve with stoich somewhere around where it > starts to rise. Does it need to be driven externally after warm-up? It has an 'S' type curve, where the voltage is close to 0 when the exhaust contains exhaust from completely burned lean mixture. In a rich mixture, the sensor reads approximately 800 mV. Right around stoich, the sensor goes into its linear region. The height and slope of this linear region is highly dependant on temperature, even more so than on the mixture... +----------- 800 mV + + + 100 mV----------+ LEAN 14.8 14.7 14.6 > I thought it already read out the A/F ratio. What exactly are you saying > above? Is the "pump" a constant current source? The 'pump' is fed by a current source. The amount of current fed through the 'pump' cell controls when the sensing element does the above... for example, by feeding 5 mA into the pump cell, the trip point looks the same (more or less), but it is shifted... I'd suggest reading SAE paper 860408, by Seikoo Suzuki, Takao Sasayama, Masayuki Miki, Minoru Ohsuga, Shigeru Tanaka, Sadayasu Ueno, and Norio Ichikawa of Hitachi. Also, papers 841250, 850378, and 850379 contain material on this topic. +-------- 800 mV + + 100 mV -----------+ 10.7 10.6 10.5 That's what everybody thought, too... About 3 or 4 years ago, a few people from the EPA wrote an SAE paper on the subject of oxygen sensors. My copy of the paper is at school, so I can't quote the names or give you the SAE paper number. But I can summarize it, because I was suprised, too. The EPA was going to do a study of oxygen sensor aging and break-in periods, and quantify how this affects exhaust emissions. They built a test setup with a heater (which would heat up the sensor and the gas it was exposed to), and a valving system that would allow them to purge the test system with nitrogen gas, and then give samples of other gasses. What they found surprised them... The most obvious test is to see what temperature was required for the sensor to sense oxygen. So they cranked up the O2 flow, and started heating. The O2 sensor started to respond at about 800 or 900 degrees C. No exhaust system operates that under normal road-load conditions. At this point, they decided that their study should concentrate on this lack of O2 sensor activity. What they discovered was that the O2 sensor would respond to carbon monoxide and hydrogen. At normal operating temperatures, they concluded that the O2 sensor is not capable of sensing oxygen at all. Few people seem to have read this paper, though, so most people out there think that the oxygen sensor actually senses oxygen in a vehicle. It *can* sense oxygen, but it'll have to be glowing pretty bright to do it. I would suggest going to your local technical library and finding this SAE article. It will be in one of the annual article abstract books, somewhere between 1989 and 1993, and may be present in either the big thick SAE publication hardcovers, and/or in 'Sensors and Actuators', an SAE special publication series. I haven't seen any papers arguing against their conclusions, but if there are, I'll hopefully eventually find them and read them. -Dale From owner-diy_efi Tue Nov 1 15:23:53 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA05274; Tue, 1 Nov 94 15:23:53 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-1.92/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 AA05269; Tue, 1 Nov 94 10:23:51 -0500 Message-Id: <9411011523.AA05269@coulomb.eng.ohio-state.edu> To: DIY_EFI Subject: libgcc for the 68000 Date: Tue, 01 Nov 94 10:23:51 -0500 From: John S Gwynne Sender: owner-diy_efi Precedence: bulk Reply-To: DIY_EFI -------- I placed the file libgcc_m68000 on this mail server today. It is the original distribution of what I used. I have a couple of these, but this one seemed to be organized the best. 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 owner-diy_efi Tue Nov 1 17:39:39 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA06305; Tue, 1 Nov 94 17:39:39 GMT Received: from SGI.COM by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo-1.92/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 AA06300; Tue, 1 Nov 94 12:39:37 -0500 Received: from zcar.engr.sgi.com by sgi.sgi.com via ESMTP (940627.SGI.8.6.9/910110.SGI) for <@sgi.sgi.com:DIY_EFI@coulomb.eng.ohio-state.edu> id JAA03142; Tue, 1 Nov 1994 09:39:35 -0800 Received: by zcar.engr.sgi.com (940816.SGI.8.6.9/911001.SGI) for DIY_EFI@coulomb.eng.ohio-state.edu id JAA00765; Tue, 1 Nov 1994 09:42:45 -0800 Date: Tue, 1 Nov 1994 09:42:45 -0800 From: keng@zcar.engr.sgi.com (Ken Greenebaum) Message-Id: <199411011742.JAA00765@zcar.engr.sgi.com> To: DIY_EFI Subject: Introduction Sender: owner-diy_efi Precedence: bulk Reply-To: DIY_EFI Hi All, Just now subscribed to the efi list and thought I would introduce myself. I do library/os/systems level programming at Silicon Graphics and have done a number of embedded dsp projects using both TI, and Motorola DSPs. At home I design projects around antiquated but cheap and easy to wire wrap 8-bit microcontrollers, most often the 8051. Often for home controll. Most recently I have been programming the 8051 in C using Dave Dunfield's compiler (which I ported to my unix box). I have long been interested in engine control, but haven't been brave enough to venture out on my own. I commute by bicycle, but play w/a '71 240Z on the weekends. The Z would be my rolling test bed. I would be most interested in starting with an ignition controller, possibly one with knock sensors to dynamicaly adjust timing. I am hoping that folks on this list are participating in a group design. Possibly I can lend a hand, once brought up to speed... -Ken From owner-diy_efi Tue Nov 1 19:33:55 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA06831; Tue, 1 Nov 94 19:33:55 GMT Received: from naitgate.nait.ab.ca by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo-1.92/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 AA06826; Tue, 1 Nov 94 14:33:47 -0500 Received: by naitgate.nait.ab.ca (AIX 3.2/UCB 5.64/4.03) id AA21339; Tue, 1 Nov 1994 12:34:26 -0700 Date: Tue, 1 Nov 1994 12:34:25 -0700 (MST) From: Grant Beattie Subject: Let me introduce myself To: DIY_EFI Message-Id: Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-diy_efi Precedence: bulk Reply-To: DIY_EFI I teach Motorola 68HC11 courses at a two-year technical school in Canada. But on weekends I'm a kart racer who would like to add EFI and data acquisition to my Briggs 5HP+ engine. So far I've gotten as far as creating a data acquisition system that logs speed, therefore I have a long way to go! Has anyone been down this road before? GB .-------------------------------------------------------------------------. | Grant Beattie | Internet: grantb@nait.ab.ca | | Computer Engineering Tech. | Compuserve: 74547,30 | | N.A.I.T. (Alberta, Canada) | Voice: 403-471-8422 | `-------------------------------------------------------------------------' From owner-diy_efi Wed Nov 2 00:17:19 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA08734; Wed, 2 Nov 94 00:17:19 GMT Received: from naitgate.nait.ab.ca by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo-1.92/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 AA08729; Tue, 1 Nov 94 19:17:15 -0500 Received: by naitgate.nait.ab.ca (AIX 3.2/UCB 5.64/4.03) id AA05252; Tue, 1 Nov 1994 17:18:03 -0700 Date: Tue, 1 Nov 1994 17:18:02 -0700 (MST) From: Grant Beattie Subject: The files... To: DIY_EFI Message-Id: Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-diy_efi Precedence: bulk Reply-To: DIY_EFI Could someone let me know a little about the 68hc000 postscript files? I am under the impression that it is a schematic of an EFI unit, but 400k bytes seems a *little* large for one schematic... GB From owner-diy_efi Wed Nov 2 03:30:46 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA10220; Wed, 2 Nov 94 03:30:46 GMT Received: from shiva.trl.OZ.AU by coulomb.eng.ohio-state.edu via SMTP (920330.SGI/920502.SGI) for /usr/local/mail/majordomo-1.92/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 AA10215; Tue, 1 Nov 94 22:30:39 -0500 Received: by shiva.trl.OZ.AU id AA22212 (5.65c/IDA-1.4.4 for DIY_EFI@coulomb.eng.ohio-state.edu); Wed, 2 Nov 1994 14:16:45 +1100 From: Craig Pugsley Message-Id: <199411020316.AA22212@shiva.trl.OZ.AU> Subject: Found.. 8051 FAQ. To: DIY_EFI Date: Wed, 2 Nov 1994 14:16:44 +1100 (EST) X-Mailer: ELM [version 2.4 PL20] Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Length: 1711 Sender: owner-diy_efi Precedence: bulk Reply-To: DIY_EFI Hi there, While the general concensus of this list is to use a 68xxx processor, I'm using an 8051 as i/ I've used it before ii/ the 8xC552 has all of the features required for this sort of project iii/ I've got an 8051 based development kit. Anyway, I was trying to find assemblers/compilers for free and was pointed to the comp.sys.intel newsgroups "8051 faq" as a source of FTPable stuff. I haven't read it in detail, but it looks like there's a lot of nice stuff out there. Here's a quick list of where it's available: Host plaza.aarnet.edu.au Location: /usenet/FAQs/comp.sys.intel Host freebsd.cdrom.com Location: /.9/rtfm/comp.sys.intel Host ftp.uni-stuttgart.de Location: /pub/doc/faq/comp.sys.intel Host ftp.rz.uni-ulm.de Location: /pub/news-faq/comp.sys.intel Host rimbaud.polytechnique.fr Location: /pub/faq-by-newsgroup/comp/comp.sys.intel Now, back to an EFI question. This is what I plan to do to get it running: I'm going to just use a "3-D" look-up table, with RPM on one axis and load on the other (load being just engine vacuum level for starters). The location pointed to by RPM and load will be a number that is used for a counter that turns on the injectors: I plan to use 4 bits (=16 points) for the RPM axis and 5 bits (=32 points) for the load axis, giving a total of 512 settings - (Co incidentally the same way that other well known controllers are laid out). Once I get an engine to run then I'll start thinking about an accelerator pump, cold starting, over-run cut off, altitude compensation, EGO correction etc etc etc. Does the 3D table sound described above sound like a reasonable implementation? Has anyone tried something like this before? Craig. From owner-diy_efi Wed Nov 2 04:16:13 1994 Received: by coulomb.eng.ohio-state.edu (920330.SGI/920502.SGI) id AA10314; Wed, 2 Nov 94 04:16:13 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-1.92/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 AA10309; Tue, 1 Nov 94 23:16:11 -0500 Message-Id: <9411020416.AA10309@coulomb.eng.ohio-state.edu> To: DIY_EFI Subject: Re: The files... In-Reply-To: Your message of "Tue, 01 Nov 94 17:18:02 MST." Date: Tue, 01 Nov 94 23:16:11 -0500 From: John S Gwynne Sender: owner-diy_efi Precedence: bulk Reply-To: DIY_EFI -------- In message , you w rite: | Could someone let me know a little about the 68hc000 postscript files? I | am under the impression that it is a schematic of an EFI unit, but 400k | bytes seems a *little* large for one schematic... Large? Just wait till version 1.0 comes out next month :). The ps file is indeed a schematic, but not a complete controller yet. The file prints five pages that, when taped together, yield a D-sized drawing of the CPU portion of what will be a controller. For more information, check-out the DIY_EFI's WWW server at http://www.cpsc.ucalgary.ca/~fridman/diy_efi There you will find the schematic, a couple of photos, and a description. In short, this 4"x6" board is a complete single board computer that has been tailored for EFI control. In the next few months, a second expansion board will be added to support the EFI functions. This project represent the first controller to be shared in this forum and should not be viewed as more than that (although, I do encourage people to build it and HELP with its development :) ). It is my hope that those who do build something (**anything**) share it with this group so that the rest of us may learn and benefit from your experience. I have chosen to work with the 68000 since it is the cheapest entry into the m68k family that opens the door to a great deal of GNU software (gcc, gas, binary utilities, glibc, gdb,...) and the RTEMS kernel. I encourage others to work with the CPU of their choice, and hopefully we can all share information on interfacing and control algorithms. 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 -------------------------------------------------------------------------------