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IDProjectCategoryView StatusDate SubmittedLast Update
0000869FirmwareGeneral Featurespublic2013-10-07 17:512013-10-16 09:37
Reporterpjohns30 
Assigned ToFred 
PrioritynoneSeverityfeatureReproducibilitysometimes
StatusassignedResolutionopen 
PlatformOSOS Version
Product Version0.2.0-SNAPSHOT 
Target VersionASAPFixed in Version 
Summary0000869: Priming pulse timing.
DescriptionThe priming pulse happens before the fuel rail gets much pressure in it, so you don't get much fuel. I suggested a delay, but Fred says he doesn't want to wait 0.5 sec to start cranking the engine. So my next suggestion is to inject the priming pulse on the first primaryISR event, or the third, or whatever makes Fred happy.
TagsNo tags attached.
FirmwareVersion5697a1f
Issue TypeImprovement
Risk of Breakagemedium
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User avatar (0002718)
Fred (administrator)
2013-10-07 17:54

I like your idea about doing it on the first hit. The only down side to this is that we'll also prime on a restart without key off, which may then be too much fuel if things are already wet from just stalling, for eg. Let's bang up a thread (can you?) in the firmware section about priming pulse semantics framing it how it is, and proposing your solution, and see what the others think. Link it in IRC once ready. Cheers! :-)
User avatar (0002719)
pjohns30 (reporter)
2013-10-07 18:51

No you could just make a flag that won't allow it to reprime until it's cleared by the ecu getting reset.
User avatar (0002720)
Fred (administrator)
2013-10-07 19:17

Yes, obviously, or a heuristic to deliver less fuel in those circumstances, etc.
User avatar (0002730)
Fred (administrator)
2013-10-16 09:37

Added some details.

Changed always to sometimes because this is not demonstrable on most vehicles where pressure is maintained indefinitely. I expect a lot of imperfect modified cars in future, so this is a good request.

Link to Peter's thread: http://forum.diyefi.org/viewtopic.php?f=8&t=2310 [^]


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