|
|
Charlie,
I'm using Honeywell NT series switches.
Bobby
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Tuesday, June 03, 2014 12:36 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: controller, sensor, wiring questions
Charlie,
I have connected two devices to a narrow band O2 sensor in addition to
the EC2 with good results. The devices have to have high input
impedance.
I don't have an EM device, but others have connected both the data in
and out lines to the EC2/3 to the serial converter for the data logging
and observation and Ed's EFISM with a double pole double throw switch.
Only one of the systems can be used at a given time.
For the CAS, I used the same connector as for the fuel injectors. It
required the pins in the CAS to be bent into a slight offset. The
arrangement has been working for the two CAS on my test stand for some
time now without any problems.
The exhaust manifold O2 sensor on my 2009+ Renesis is a four wire wide
band sensor which uses a different control system than the aftermarket
wideband sensors I've seen. The O2 sensor further downstream is a
narrow band sensor. The pre-2009 Renesis may be different, though.
Using switches with excess current capability for the fuel injectors
doesn't seem to be a bad idea. Dennis probably can give you some direct
feedback on this.
Steve Boese
RV6A, 1986 13B NA, RD1A, EC2
________________________________________
From: Rotary motors in aircraft <flyrotary@lancaironline.net> on behalf
of Charlie England <flyrotary@lancaironline.net>
Sent: Tuesday, June 03, 2014 7:50 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: controller, sensor, wiring questions
I've got two sensors off RX-8 exhaust manifolds, so money shouldn't be
an issue. However, apparently on the EC3 supports wide band sensors; the
latest EC2 will do auto tune with a narrow band sensor but doesn't
support wideband.
If I can use the RX-8 sensor & it will still work as a narrow band to
feed the EC2, that would be great. Do you have a link that describes
hooking one up to do both wide & narrow band?
Thanks,
Charlie
(BTW, I'm aware that the inrush current to the injectors is much higher
than steady state, but I'd think that it would be of incredibly short
duration, so average load on the contacts should be very low.)
On 6/3/2014 7:43 AM, Bobby J. Hughes wrote:
> Also most wide ands also have a narrow band output for other devices.
>
> Bobby
>
> Sent from my iPhone
>
>> On Jun 3, 2014, at 7:39 AM, "Bobby J. Hughes"
<flyrotary@lancaironline.net> wrote:
>>
>> I think Tracy's latest upgrade support wideband o2 auto tune without
the EM. Skip the narrowband and save some fuel $ during tuning. Your
fuel savings will more than pay for the wideband and it's more useful in
flight.
>>
>> Bobby Hughes
>> Sent from my iPhone
>>
>>> On Jun 3, 2014, at 6:12 AM, "Ed Anderson"
<flyrotary@lancaironline.net> wrote:
>>>
>>> Charlie, I'm a bit behind the times on Tracy's EC2 - but, last I
knew it did not have an auto tune feature (my info could easily be out
of date), plus it was my understanding that the auto tune feature
required the EM2/3 as well as the EC.
>>>
>>> For best results the EFISM should be grounded to the aircraft
electrical ground rather than to a ground pin on some other accessory.
It should not really make a difference, but closer to the battery
negative lead the better in my opinion. Current thought seems to be not
to use aircraft chassis as a primary electrical ground.
>>>
>>> PS Don't' forget to bring the EFISM with you.
>>>
>>> Ed
>>>
>>> -----Original Message----- From: Charlie England
>>> Sent: Monday, June 02, 2014 9:11 PM
>>> To: Rotary motors in aircraft
>>> Subject: [FlyRotary] controller, sensor, wiring questions
>>>
>>> Currently building the wiring harness for the engine/controller, &
>>> have a few questions.
>>>
>>> 1st, is anyone running multiple devices that need to see the 1-wire
>>> O-2 sensor? I need to feed both the EC2 (for auto-tune) and Ed A's
monitor.
>>> Will there be a conflict if both are connected to the sensor at the
>>> same time?
>>>
>>> 1a (for Ed A), does your monitor care where it's grounded, for
>>> stable/accurate measurement? Both pin pairs 19/37 and pins 1/16 go
>>> to chassis ground, but the pairs are not common to each other in the
EC2.
>>> Should it go direct to chassis, or to one or the other of the ground
pairs?
>>>
>>> 2nd, I'd like to include Steve Boese's Rotary Copilot running on an
>>> iPaq, for data logging. I'm fairly confident that I'll need to
>>> switch pin 27 ( EC2 serial data in) between the two devices. Can pin
>>> 7 (EC2 serial data out) feed both devices at once, or should it be
>>> switched, as well?
>>>
>>> 3rd, the high impedance injectors seem to draw less than 1 A each,
>>> when on. Are true 10A DC rated switches needed for injector disable,
>>> or would lower current, AC rated switches do? A true 10 A DC rated
>>> switch is not that easy to find (or afford...), and with the draw
>>> being effectively AC (high speed switching) and <2 A for primary
>>> pair and secondary pair, it would seem that a 5A DC rated switch
should get the job done safely.
>>>
>>> 4th, anyone have a source for the RX-8 crank angle sensor connector?
>>> I can solder directly to the sensor, but I'd rather use proper
>>> connectors, if possible.
>>>
>>> Thanks,
>>>
>>> Charlie
>>>
--
Homepage: http://www.flyrotary.com/
Archive and UnSub:
http://mail.lancaironline.net:81/lists/flyrotary/List.html
--
Homepage: http://www.flyrotary.com/
Archive and UnSub:
http://mail.lancaironline.net:81/lists/flyrotary/List.html
|
|