> Yes, but I'm not sure where you are going. You thinking normally closed c= ontacts to OEM CAS, norm open to backup CAS? You still have to manage angle o= ffset. Would be unfortunate to have moisture in relay or turbulence disrupt C= AS. Likely not going to end up with safety improvement. Good creative idea t= hough. > The rotary engine CAS is set up on a bracket near the front pulley. I was e= nvisioning a system where you had a sensor in exactly the same spot on the o= ther side of the toothed wheel. You might need an offset alternator pulley t= o make room for it - but then you don't have to worry about angles/offsets. I= t's just a second sensor, ready to go - flip a switch and try an engine rest= art. If relay reliability was a concern there are always SSRs or even just g= ood switching transistors... >=20 --Apple-Mail-12-574509741 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

The relay is not needed in this hypothe= tical fix. The EC2/3 already has 2 CAS inputs. All that is need= ed is a hard definition of sensor offset so the software can be written a= ppropriately. ( I'm assuming a Renesis engine which has only one CAS i= n this discussion.)

The CAS output is an AC v= oltage sine-wave that varies with engine speed. This is true for both= Mazda and Subaru engines (and almost all others). The sensor is a va= riable reluctor type.

Tracy

Sen= t from my iPad

On Sep 14, 2011, at 11:53 AM, Chad Robinson <= ;crobinson@medialantern.com> wrote:

On 9/14/2011 1:48 PM, Al Wick wrote:
=20 =20
<What kind of signal is on the CAS line

If memory serves, it's 0 to 5vdc square wave.

<Could it go through a relay safely?

Yes, but I'm not sure where you are going. You thinking normally closed contacts to OEM CAS, norm open to backup CAS? You still have to manage angle offset. Would be unfortunate to have moisture in relay or turbulence disrupt CAS. Likely not going to end up with safety improvement. Good creative idea though.

The rotary engine CAS is set up on a bracket near the front pulley. I was envisioning a system where you had a sensor in exactly the same spot on the other side of the toothed wheel. You might need an offset alternator pulley to make room for it - but then you don't have to worry about angles/offsets. It's just a second sensor, ready to go - flip a switch and try an engine restart. If relay reliability was a concern there are always SSRs or even just good switching transistors...

=20

= --Apple-Mail-12-574509741--