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Variable valve timing and cylinder identification

 
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HOODEY



Joined: 20 Jan 2006
Posts: 170

PostPosted: Thu Feb 07, 2013 1:26 pm    Post subject: Variable valve timing and cylinder identification Reply with quote

How does the ECU determine which cylinder is firing when the
cam can be advanced are retarded?

I am trying to decode the nissan 350z cam pulses.
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PQatPIT



Joined: 25 Sep 2007
Posts: 52

PostPosted: Fri Feb 08, 2013 6:43 am    Post subject: Reply with quote

Depends on ecu. What ecu are you using?
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sam@tdi



Joined: 11 Sep 2006
Posts: 751
Location: London, England

PostPosted: Fri Feb 08, 2013 8:35 am    Post subject: Reply with quote

Once the ecu has successfully established the engine phases compared to the index edge in the crank sensor waveform the once it can just do a simple 1-2 count from then on in, so it doesn't have to keep rechecking the phase in order to maintain a 720 sync when the cam timing is actively altering relative to the crank.

As for cylinder identification, once 720 sync is established the ecu just counts out the firing order from the crank index edge.
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HOODEY



Joined: 20 Jan 2006
Posts: 170

PostPosted: Mon Apr 15, 2013 5:50 pm    Post subject: Reply with quote

Okay code almost finished. I will test shortly.
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