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I'll try and summarize what has been discussed to and from regarding the nissan trigger system. First, we need to understand how the current trigger works. It's an optical system located on the '''cam'''. There are '''two''' sensors. One of them records the engine speed using 360 small slots. The other one triggers the ignition events using different sized slots. It knows which cylinder is 'active' by counting the number of small slots while the larger slot is open. See [http://200sx.jagenheim.se/images/trigger.png this image] and reread the paragraph and it will make sense. This image is for the CA18DET engine. The SR20DET, RB26DETT and the other nissan engines works in exactly the same way, but differs on where the slots are placed and the number of cylinders. '''Update''': this ''may'' not be true. I've seen pictures of discs where only one of the slots is large (to indicate #1) and the rest is small. If someone could find a trigger disc which isn't from a CA18DET to confirm this, it'd be great. It's not a big problem, but it ''will'' affect the implementation. So, how do we support this in VEMS? 360 camtooth (180 teeth per crank rotation) is suitable for interrupt processing. Especially with the small trick to disable the interrupt for the dense teeth where not needed (neglected 95% of the time). There is an implemenation for this in SVN now; but we need to stabilize trunk before merging it in. '''Latest News''' The trigger is being tested with the latest stable, and seems to work fine with injector triggers, but not so with ignition. There seems to be some random events occuring at low speed (100->300rpm). I have a video example using the TestLight they're both the same content but the codecs are different. The three leds on the left are connected to the injector FETs, these are on batch fire so you can see each trigger. The leds on the right hand side of the testlight are connected to the IGBTs and are configured to start at the bottom right and fire each led anti-clockwise. http://vems.hu/www.vems.co.uk/VEMSInstalls/NissanTrigger/testrigger.wmv http://vems.hu/www.vems.co.uk/VEMSInstalls/NissanTrigger/testtrigger.avi It seems that after each time I pause turning the trigger that the thing resets and starts back at cylinder 1. Whats worrying is the fact some of the IGBTs stay on. ---- '''See also''' * guys interested in this ** MembersPage/FredrikJagenheim ** MembersPage/JannoKusman ** MembersPage/FredrikBruland
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