Early EFi Renault engines came with an unusual trigger pattern on their flywheel. 20 teeth followed by one tooth twice the normal tooth width, followed by a missing tooth twice the normal tooth width.
This pattern occurs twice to indicate TDC & BDC.
A trigger log of the flywheel has been made:
http://vems.hu/www.vems.co.uk/VEMSTrigger/RenaultToothTimes.txt
Using the Examples from http://www.vems.hu/wiki/index.php?page=InputTrigger%2FTriggerLog
This looks like an inverted sensor
... ....
455 4416 # long
457 2929 # long
459 1835
461 1838
463 1866
465 1834
467 1822
469 1822
471 1844
473 1815
475 1803
477 1836
479 1799
481 1799
483 1801
485 1831
487 1802
489 1811
491 1847
493 1813
495 4480 # long
497 2873 # long
... one crank rotation later position 495-455 = 40
499 1837
501 1829
503 1840
We can see that the 20-2 teeth pattern is a bit strange - it looks like 40-2.
Can this trigger pattern be used with our existing Triggering algorithm?