Renault 60-2 Missing Teeth Decoder

[ruzki]

As i wrote in my thread in the vehicles section im trying to run the Freeems on a Renault 60-2 trigger wheel.

viewtopic.php?f=3&t=2380

Unfortunately the wheel looks more like a 57-1,5+1,5 trigger wheel.
In the OEM setup there is also a half moon cam trigger, but the goal for now is to get only the crank trigger working.

Reason for this thread is to post additional information about the Renault Trigger configuration

[ruzki]

This trigger wheel is working with ( freeems-vanilla 0.2.0 )

[Fred]

0.2.0 is not out yet! 0.2.0-SNAPSHOT, is, though, so I guess that's what you're using ;-)

[Fred]

Ahh, sorry to say this, but using this wheel with the missing tooth decoder is not a good move! At best you'll get +/- 3 degrees of error in your timing if the event happens to be scheduled from the oddly spaced edge. one of the two odd spaced edges. The pattern is actually ...1, 1.5, 2.5, 1... whereas your decoder is expecting ...1, 1, 3, 1... hence the two 0.5 spacing error, standard spacing = 6 degrees, and half that is 3. The only reason it's working at all is that you must have loosened the tolerances right off. Oops.

This is almost certainly contributing to your sync loss issues in the other thread which I'll cross reference soon, here: viewtopic.php?f=56&t=2641

I'm sorry I didn't notice your comment "Unfortunately the wheel looks more like a 57-1,5+1,5 trigger wheel." Nor did I see/recognise/realise what this photo meant:






And now I see another comment "It is a kinda 57 +1,5 tooth -1,5 gap .. something like this .." wish I'd seen/noticed these earlier!

Sorry.

[ruzki]

correctly wired the decoder see´s ...1, 2.5, 1.5, 1...

Sidenote: Volodsquirt seems to be fine with this trigger wheel although it´s seeing ...1, 2.5, 1.5, 1... but people used to have had problems to get it working ..

[Fred]

All that tells you is that you can't trust their firmware! :-/ One of the edges IS in the wrong place AND of variable position, so unless you can somehow tell it that, then it's going to do bad things.

Thanks for the polarity info! I plan to support both polarities, as either should work fairly reliably depending upon how it's constructed. If you think it's not worth it, maybe I won't bother.