InputTrigger/MitsubishiTrigger (2005-06-06 20:04:01)

This Mitsubishi has a HALL trigger on the camsync.

unfortunately

The trigger is Coil type (one pulse per event ), but alternating positive and negative to distinguish 1-4 and 2-3 cylinders (are you sure?).

Somewhere we apparently have a a series capacitor (input highpass filter !!! ) that causes the very characteristic sharktooth signal.

IgnitionTrigger.png

The signal is currently processed with LM1815 and series condenser so it is theoretically universal considering trigger type (hall and VR). In 50% of cases, LCD displays right value, otherwise rough half of proper RPM.

if we reconstruct the original signal, we can see that

(or the other way around)

Note that

Find the correct cyl:

Any ideas, how to condition the signal?


Setup is not VR anymore, but the symptoms are the same

I converted the TRIG1 input to hall setup and removed 10k pullup as well, but I don't have stable RPM signal yet as I described above.

This must be something trivial. Eg. if you configure falling edge (primary_trigger bit0=0), RPM reading should be rock stable. Maybe you accidentally configured rising edge (primary_trigger bit0=1) ?

On the other hand I found an other trigger:


An other trigger found

I've found an other trigger probably from crank-shaft HALL because 3 wires are coming from the bottom of engine (I will check it soon). Wires: 0V, 12V, signal (0V or 5V).

Notes:

We know too little about this. Scope snapshots would be nice. particularly, with 2 channel snapshot together with the CAM-HALL. Maybe connecting the

and measuiring "alien dwell" would work to sync to CAM. This would mean than without the crank signal.

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