DIY_EFI Digest Saturday, 27 April 1996 Volume 01 : Number 122 In this issue: EFI332 list RE: Looking for MC3484 peak/hold injector drivers Honda UEGO Sensor... RE: Honda UEGO Sensor... Re: Honda UEGO Sensor... RE: Honda UEGO Sensor... See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: "Zublin, Bryan (SD-MS)" Date: Fri, 26 Apr 1996 09:53:00 -0700 (PDT) Subject: EFI332 list Here is some info on the EFI332 list. Bryan Zublin bzublin@xxx.com ================================================================ efi332 ================================================================ To subscribe: Send "subscribe efi332
" to Majordomo@xxx. The request must be in the body of the message; *not* the subject line. For help: Send "help" to Majordomo@xxx. To post: Send to "efi332@xxx.edu" Charter: (subject to change) This mailing-list is *strictly* dedicated to the discussion of topics related to the design of the efi332 engine controller. John S. Gwynne ------------------------------ From: "Zublin, Bryan (SD-MS)" Date: Fri, 26 Apr 1996 09:51:00 -0700 (PDT) Subject: RE: Looking for MC3484 peak/hold injector drivers Mark, Here is a post that appeared on the EFI332 list regarding the drivers you are looking for. I also included info on how to subscribe to the EFI332 list. Bryan Zublin bzublin@xxx.com ---------- From: owner-efi332-outgoing To: efi332 Subject: RE: Looking for MC3484 peak/hold injector drivers Date: Thursday, April 25, 1996 10:55PM I have recently went into production of my first EFI system and I am using the Cherry 4/1 amp part. I would be willing to sell them to the net EFI people in small quantities since I have plenty at the moment. I will have to look and see what my price is, but cherry is prouder of them than motorola. They are around $6 each. Let me know if there is any interest. David J. Doddek |pantera@xxx.com Owner SGD Electronics & Development Engr for Caterpillar |h 309 685-7965 Formula SAE Team Sidewinder 94-95 |w 309 578-2931 89 T-bird SC, 69 Fairlane w/SGD EFI |fx 217 428-4686 74 Pantera w/Electromitive Tec-II Twin turbos and Nitros | Hey, If you are going to go fast, go REEEAAL FAST. | -------------------------------------- ================================================================ efi332 ================================================================ To subscribe: Send "subscribe efi332
" to Majordomo@xxx. The request must be in the body of the message; *not* the subject line. For help: Send "help" to Majordomo@xxx. To post: Send to "efi332@xxx.edu" Charter: (subject to change) This mailing-list is *strictly* dedicated to the discussion of topics related to the design of the efi332 engine controller. John S. Gwynne ------------------------------ From: Land Shark Date: Fri, 26 Apr 1996 14:27:20 -0600 Subject: Honda UEGO Sensor... Or LAF sensor or whatever .... Part # .. 395986 from 1993 Civic VX, Cost $130ish Has same wires and colors as the NTK $600 sensor.. Same compensating resistance in the plug too... The UEGO body markings are the same as the one from Horiba ($900+) MEXA analyzer .. Honda wiring diags from Civic VX show same ckt. annotations as the NTK fax I received .. For heater: orange Vh+ yellow Vh- For Sensor: red Vs+ black Vs- / Ip- white Ip+ Now, all we need to do is to build a DRIVER circuit and we will have the DIY_EFI $200 UEGO sensor... Vs. $1000 from NTK, or $2500 from Horiba ... Maybe $250, with a PIC and a nifty display addon ;) Jim ------------------------------ From: "Zublin, Bryan (SD-MS)" Date: Fri, 26 Apr 1996 17:27:00 -0700 (PDT) Subject: RE: Honda UEGO Sensor... >Now, all we need to do is to build a DRIVER circuit >and we will have the DIY_EFI $200 UEGO sensor... Jim, If you have data sheets for this sensor (and maybe an application note), I would like to tackle this project. I have analog design experience as well as experience with small embedded controllers. My approach would be an A/D converter with linearization done by the micro. The calibration table could be stored in non-volatile EEPROM. The parts cost should be less than $50 ($5 for the uC, $1 for EEPROM, $5 for display/driver, $10 for ADC, $3 for voltage reference, etc.). If Honda is putting the electronics in their cars, then the interface cost has got to be reasonable. A few questions: 1. Is each sensor calibrated with each interface box? For example, with the NTK or Horiba boxes, when you replace the UEGO sensor, do you need to recalibrate the unit? Hopefully the answer is NO. 2. What kind of accuracy do the manufacturers claim for the sensors? And what accuracy do the interface box manufacturers claim? This project would require the initial accuracy to be decent, without having to calibrate (tweak) each unit against an expensive lab standard. Bryan Zublin bzublin@xxx.com ------------------------------ From: Frank F Parker Date: Fri, 26 Apr 1996 22:06:45 -0400 (EDT) Subject: Re: Honda UEGO Sensor... On Fri, 26 Apr 1996, Land Shark wrote: > Or LAF sensor or whatever .... > > Part # .. 395986 from 1993 Civic VX, > > Cost $130ish > > > Now, all we need to do is to build a DRIVER circuit > and we will have the DIY_EFI $200 UEGO sensor... > > Vs. $1000 from NTK, or $2500 from Horiba ... > > Maybe $250, with a PIC and a nifty display addon ;) > > Jim > I am still waiting to hear from a O2 sensor guru @ Honda to see if I can get a circuit for Honda sensor. Since then I have found out about a Bosch wide range sensor for about $150 and have info coming on it. Frank Parker > ------------------------------ From: Frank F Parker Date: Fri, 26 Apr 1996 22:31:07 -0400 (EDT) Subject: RE: Honda UEGO Sensor... On Fri, 26 Apr 1996, Zublin, Bryan (SD-MS) wrote: > A few questions: > 1. Is each sensor calibrated with each interface box? For example, with > the NTK or Horiba boxes, when you replace the UEGO sensor, do you need to > recalibrate the unit? Hopefully the answer is NO. Horriba is about 1 mile from my house. I try to stop by and ask them but I don't think so. > > 2. What kind of accuracy do the manufacturers claim for the sensors? And > what accuracy do the interface box manufacturers claim? This project would > require the initial accuracy to be decent, without having to calibrate > (tweak) each unit against an expensive lab standard. > >From the Horriba sheet, the range is lamda 0.7 (rich) to 1.5 (lean) Accuracy: +- 0.08 from L=0.7 to 0.9 +- 0.04 from L=0.9 to 1.2 where L=1.0= 14.7/1 a/f +- 0.08 from L=1.2 to 1.5 ( very lean) Sensor calibration is shown as 1 point cal in atmosphere The UEGO is 2 back to back cells with the pumping current measured after cell is supplied from a constant current supply. Output is positive above 14.7 and negative as less than (rich) side of 14.7/1. It is not linear so that is the problem. What is the transfer function?? The companies are secretive. I have a lead on a circuit for the Bosch sensor. Frank Parker > ------------------------------ End of DIY_EFI Digest V1 #122 ***************************** To subscribe to DIY_EFI-Digest, send the command: subscribe diy_efi-digest in the body of a message to "Majordomo@xxx. A non-digest (direct mail) version of this list is also available; to subscribe to that instead, replace "diy_efi-digest" in the command above with "diy_efi".