Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

> MegaSquirt has competition
JeffBowlsby
post Aug 23 2003, 10:35 AM
Post #1


914 Wiring Harnesses
*****

Group: Members
Posts: 8,548
Joined: 7-January 03
From: San Ramon CA
Member No.: 104
Region Association: None



Dave Carlson, fellow 914 owner, has contacted me to let me know he is developing an engine management system (EMS) for the 914 and other air cooled cars. He apparently has a working prototype on a T3 engine.

I know he would appreciate our input, guidance and collective wisdom in developing his EMS system to meet out needs.

Whaddya think boyz and girlz...?

Post comments here or email him thru his site:

http://home.mindspring.com/~dave.c/kitcarlson/
User is online!Profile CardPM
Go to the top of the page
+Quote Post
 
Reply to this topicStart new topic
Replies
KitCarlson
post Aug 23 2003, 01:46 PM
Post #2


Member
**

Group: Members
Posts: 85
Joined: 20-August 03
From: TN
Member No.: 1,052



(IMG:style_emoticons/default/ohmy.gif)

Thank's for all the comment's!

I have been dreaming, researching, developing in an endless loop since about 1997 on this EFI stuff. The commitment to actually do something has come recently. I have spent my career developing sucessful products for others, and neglecting to follow my dreams. Working for myself is a bit of a shift.

There are many more functions in the hardware that need to be implemented in software. The guts of the system is there, the dwell and timing control, the fuel calculation and timing, and the mmi. The system is interrupt based, there are sufficient timers and resources to keep things simple in the code. The calculations are done every 180 crankdegrees. The cold start, throttle enrichment, unloading, and other drivability things are roughed out, but not tested. The code is written in C. The code size is currently 12K bytes, less than 10% full (room for 128K). The code can be bootloaded over the communications connection.

The operator interface is all done on the EMS, only a VT100 terminal program needs to run on the Palm® or PC. Many pararameters are displayed at the moment. Parameters are easily changed by moving to the parameter, (inverted-video) then + or - to change the variable real time. Values are stored in eeprom if desired. The "VT100 Online" by Mark-Space ® enables Palm "keys" to be assigned to chars, the "Keys" are then easily used to make adjustments.

Having the system start up and run was bit of a surprise! I expected countless multiple bugs. Turning the distributor in a drill press and monitoring the ignition and fuel pulses with respect to the timing reference signals worked well to sort things out. Most all development was in my lab, (garage with A/C) off the engine. I seem to loose my head around a spinning engine on a stand.

By Monday I will have a 5 gas exhaust analyzer. This will help safely check out the fuel mixture. It is a portable unit. I hope to get the wife involved. It will be hard to drive, do the mmi, and monitor the Ferret14.

My website is new and many changes have been made recently. It will be a challenge keeping up with the e-mails, website, design, procurement, fabrcation, assembly, and check-out. The marketing thing will be new too. The good thing is I love what I am doing and I'm willing to spend countless hours. I have added a "Please Help!" link on the website, many you work at varied professions, please help me out in my many weak places. Comments and suggestions are appreciated.

Dave
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Posts in this topic
Jeff Bowlsby   MegaSquirt has competition   Aug 23 2003, 10:35 AM
seanery   That sounds interesting and EASY!   Aug 23 2003, 10:43 AM
nebreitling   wow, that looks promising. i've thought befor...   Aug 23 2003, 10:51 AM
Dave_Darling   Not much description there yet. It'll be inte...   Aug 23 2003, 11:31 AM
Charles Deutsch   He is an electrical engineer so it could be a reas...   Aug 23 2003, 11:32 AM
KitCarlson   :o Thank's for all the comment's! I...   Aug 23 2003, 01:46 PM
seanery   Welcome Dave, We have a section for member produc...   Aug 23 2003, 02:34 PM
tryan   what part of tn? can you make/design/modify the di...   Aug 23 2003, 03:00 PM
Brad Roberts   Did everybody read what he said: <...   Aug 23 2003, 03:49 PM
Charles Deutsch  

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

- Lo-Fi Version Time is now: 15th June 2024 - 11:50 AM