I would
not have expected the EC2
controller to put noise into the supply line, but then again I have not
put a
scope on a running unit yet. What level spikes have you observed? And
should I consider a capacitor to absorb/dissipate potential spikes? I
used Schottky diodes on the supply lines ( due to the low forward
voltage drop
characteristics.)
Joe
Joe;
We are
still trying to resolve the settings
corruption issue, and have added a number of additional filters on the
board,
the effectiveness of which is yet to be proven. Regarding the
isolation
diodes, I also have Schottky diodes between the batteries and the ‘hot’
bus that feeds the injector and the coil power to prevent a failure in
one
battery circuit from affecting the other. It may be that noise
propagated
in these circuits being isolated from the battery is a more likely an
issue than
isolation of the power feeds to the EC2.
The
reality is that after putting
filters at the coils to kill spikes coming back from there, we do not
see any
noise levels on any pins expected to be of concern. But since the
problem
still existed we assume that there are some spikes at times we didn’t
observe;
and in studying the circuits, and what is different in my setup than
others; we
are speculating that the isolation diodes could exacerbate the issue.
More
will be known in a couple of weeks I as get some other changes/fixes
completed,
and get back in the air. After a few low-power engine runs since the
addition of the filters, there has been no changes of settings noted so
far.
Al