Ed,
You would not have to supply an O2 sensor with your EFISM.  You could just
make it accept either the 0-1, or 0-5v input.  The customer could decide
which O2 sensor they wanted to use.

Bill

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Monday, February 11, 2013 10:50 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Crickets & progress

Thanks, Steve

I'll see if I can find out more about it.   Ideally for my EFISM, I would
like to just have the 0- 5 volt input to deal with.  An easy mod to the code

with just that, but if I have to do the PID control for temps then that
simply amounts to too much to incorporate into the code (or color me too
lazy {:>))

Ed

--------------------------------------------------
From: "Steven W. Boese" <SBoese@uwyo.edu>
Sent: Monday, February 11, 2013 9:53 AM
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Crickets & progress

Ed,

The upstream sensor on the newer RX8's is called out as an air/fuel sensor

as opposed to the downstream sensor which is specified as an O2 sensor.
The mark on this upstream sensor is Denso 09M27-4350.  The Denso catalog
number is 234-9059.  It is a four wire sensor with two of the wires
apparently for a heater like a heated O2 sensor.  The output has a 5V
range from what I could find out.  So far, I have not been able to find
more specifics on this sensor, but it is possible that it is capable of a
more useful signal than the rapidly changing Nernstian signal of a
conventional O2 sensor when the mixture is stochiometric.  The sensor is
more expensive than the universal Bosch 11027 O2 sensor, but the Renesis
engine I got came with this upstream air/fuel sensor still installed in
the exhaust manifold.  If others have this sensor also, it is a
possibility that it could be used with minimal added expense.  Someone
with details of the RX8 emission system might be able to shed some light
on this.

Steve Boese
RV6A, 1986 13B NA, RD1A, EC2

________________________________________
From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of

Ed Anderson [eanderson@carolina.rr.com]
Sent: Monday, February 11, 2013 5:27 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Crickets & progress

Thanks for the suggestion, Ernest

However, the cost of the wideband sensor kits I found approach (or are
more
than) the total cost of the EFISM - so not feasible marketing wise.  But,
who knows - there are a bunch of them out there and I have not done an
exhaustive search - yet.

Ed

--------------------------------------------------
From: "Ernest Christley" <echristley@att.net>
Sent: Sunday, February 10, 2013 8:07 PM
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Crickets & progress

On Feb 9, 2013, at 6:27 PM, Ed Anderson wrote:

Great to hear about your move to the wide band O2 sensor, Tracy.

I looked into modifying the EFISM to do the same, but found the PID
control supposedly necessary to precisely control the heater element of
the wide band sensor to be much more complex than simply extending the
voltage range to interpret the WB output.  Did you embed any PID control
elements in the EC3 for temperature control - or just accepted any
small?
error associated with temp variations?

Ed

Ed, look at the LS1 line of Innovate sideband sensors.  They have their
own computer that controls the heater, and it just puts out a 0-5V
corresponding to the F/A mixture.
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