MRE-FB wrote:
     >
     > You wrote:
     >
     > "BTW Francois most people use four injectors on the rotary and

stage

     > them.
     > In other words only two are used at low power for good mixture

control

     > and all four are used at high power. Tracy Crook at
     > http://www.rotaryaviationcom/
     > builds an EFI/IGN computer with dual redundant processors that

achieves

     > this configuration."
     >
     > We also use 4 injectors and also have redundant processors.

However,

     > contrary to Tracy's ECU, each one of our boards (we call them

CIANs for

     > Numerical Injection and Ignition Controllers... in French) runs

one

     > injector on each rotor.  This way, should we lose a CIAN on

take-off,

     > the engine hardly notices and keeps its rated 220 t/o HP.  That

is, if

     > we can feed it enough fuel on only 2 injectors  With the

biggest Bosch

     > injectors, we achieve a bit over 180 HP on 2 injectors... good

but not

     > good enough.  So we need bigger injectors.  I know Siemens and

Delphi

     > make bigger injectors for car (dragsters?) racing, but I'd like

to know

     > if someone has experience with them at less than full bore!
     >
     > Thanks for the help.
     >
     > Francois

Tracy Crook wrote:

     Interesting.  How does one CIAN know that the other has failed?

     Tracy

Hi Tracy,

We have a supervisor board that, among other things like running the
display, supervises the CIANs as well as some of the critical sensors
(for instance, each CIAN has its own MAP sensor and the supervisor has a
3rd one to arbitrate if the 2 main sensors show different reading).  The
supervisor will immediately detect a defective CIAN.  It will take it
off-line and tell the remaining one to take over 100% of the injection.
In the soon to come second generation calculator, we'll be doing without
the supervisor with each CIAN constantly supervising the health of the
other one.

Hope to see you at Sun'n Fun,  Francois Badoux

 
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