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Ochoa0042
Posted on Friday, August 31, 2018 - 11:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

What is the "Keep Alive" function used for on an ECU?
The ECU has both 12volt & 5volt in its circuits..
From what I've read, the Keep Alive is an INPUT.
I'm looking for an OUTPUT signal (if any) that denotes the engine is running


Troubleshooting Question for Buell Keep Alive
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Griffmeister
Posted on Saturday, September 01, 2018 - 12:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

From what it looks like thatís unswitched battery power to the ECU for memory. I donít think thereís anything outside the ECU that cares if the engine is running or not. Donít have my manual handy, need a bigger picture to tell for sure.
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Greg_e
Posted on Saturday, September 01, 2018 - 09:55 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'm fairly certain everything lights up when key and run switch are on, nothing that is run specific.
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Nik
Posted on Wednesday, September 05, 2018 - 03:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

In other applications I have wired up an RPM switch set below idle to the tach output to create a discrete "engine on" output.
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Griffmeister
Posted on Wednesday, September 05, 2018 - 06:48 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

For that matter, the oil pressure switch will only change state when the engine is running. That would give you a simpler yes or no signal rather than having to create a specific rpm trigger.
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Teeps
Posted on Thursday, September 06, 2018 - 11:54 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Ochoa0042 Posted on Friday, August 31, 2018
I'm looking for an OUTPUT signal (if any) that denotes the engine is running


What are you trying to do?
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Ochoa0042
Posted on Monday, September 10, 2018 - 10:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Griffmeister,
That might be a real simple approach to it and can work.

Nik,
How did you manage that? The circuitry that I'm working with has to be 5 Volts.
Hopefully the Tachometer is 5 volts.
If so, I can have the the device Tach input at an Analogue input and output back to the Tach as a PWM.

Teeps,
Trying to make a device that will start my engine.
Once the engine is started, I need a failsafe signal to note the engine is on/running so that the device doesn't start the engine again by mistake of user/or/code input.
All to prevent damaging the starter motor or primary.
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Shoggin
Posted on Monday, September 10, 2018 - 11:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

About $25 on e-bay will get you an RFID secure system that will easily do that, and are actually pretty dependable too.

They are easy to install on a bike and typically use a rpm input >400 to read engine 'on' status instead of oil pressure because cranking an engine can supply enough oil pressure to close the pressure switch.
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Teeps
Posted on Tuesday, September 11, 2018 - 11:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If I understand:
you are looking for a circuit that, when the ignition is on, and the engine is NOT running has zero volts.
and, when the engine IS running has 5V.

I don't think the Buell DDFI 2 system has such an input.
Sorry, I don't have any useful info for you Ochoa.
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Ochoa0042
Posted on Tuesday, September 11, 2018 - 04:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Teeps,
Correct.
Having a 5 volt output would make it easier, yes.. but...
All that the circuit would need to correct this is a voltage regulator / resistor / p-channel mosfet to lower the voltage.
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Teeps
Posted on Tuesday, September 11, 2018 - 05:30 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

You're over my pay grade talking about p-channel mosfet.
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Shoggin
Posted on Tuesday, September 11, 2018 - 08:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The only difference in a 'running' or 'ignition-on/non-running' engine is the oil pressure switch ground/no ground or the RPM signal.

This isn't Buell specific. It's damn near universal. That is why the circuit you are trying to build from scratch will:

"typically use a rpm input >400 to read engine 'on' status instead of oil pressure because cranking an engine can supply enough oil pressure to close the pressure switch."
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Griffmeister
Posted on Wednesday, September 12, 2018 - 08:48 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Well, you could always use either a timer or a latching relay for a bare bones basic dumb circuit. Probably most important will be what is the smallest and most reliable. Interesting thought exercise though.
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