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Catching car's ignition signal

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Circlotron:

--- Quote from: cmcraeslo on August 04, 2020, 09:35:05 am ---What I'm trying to do is to build ignition cut device, that is catching the signal, "processing it" and then output it.

--- End quote ---
Are you making a rev limiter? If so, it might be easier to cut the drive to the fuel injectors instead. Easier on the catalytic converter too. No unburnt fuel going out the exhaust and no bangs and pops.

joeqsmith:

--- Quote from: cmcraeslo on August 03, 2020, 07:48:51 am ---Hey guys.

I have 12V and 2 signal wires coming out of the ECU into the ignition coil pack. To my understanding, they are active low signals, which means they get activated by the ECU with low signal (ground). I'd like to catch that signal (individually) and I have problem reading them.
...
If I cut the wire and connect the wire coming out of the ECU to 12V using a pullup, I get 12V like I should (I get 12V without the pull up as well) and it does not change when I crank. I tried different resistor values, even pull down - no change. Just as if ECU is not triggering it. What could be the issue?

--- End quote ---


--- Quote ---What I'm trying to do is to build ignition cut device, that is catching the signal, "processing it" and then output it. I have the device working on a car with ignition drivers built in the coils, but not when coils are directly driven.
Device uses very sophisticated cutting strategies, so it's not just "coil off" cutting so I need to have clean signal coming in constantly so I can process them correctly.

--- End quote ---

I'm not too surprised by your first post.  I had made an engine simulator for my bike.  Getting the ECM not to fault out on the ignition coil took some effort. Attached a couple of pictures of the that load which was a custom made pot core that I mounted inside an aluminum housing and mounted to the case to draw the heat away.   The driver basically is a HV FET that can load the secondaries to cause the ECM to  fault under software control.   This ECM is fairly low tech and I wouldn't be surprised to find the load requirements for an auto to be more critical. 

Are you trying to make some sort of governor (2-step, studder box...)?  Is the car injected?  If so, are you handling the fuel as well?   

In most of my setups, I am using aftermarket electronics which provide a kill signal input.   In the case of this stock ECM, I am using some changes to the OEM software to perform the kill.  The simulator in this case allows me to test different software without the need of running an engine. 

joeqsmith:

--- Quote from: Circlotron on August 04, 2020, 12:01:27 pm ---
--- Quote from: cmcraeslo on August 04, 2020, 09:35:05 am ---What I'm trying to do is to build ignition cut device, that is catching the signal, "processing it" and then output it.

--- End quote ---
Are you making a rev limiter? If so, it might be easier to cut the drive to the fuel injectors instead. Easier on the catalytic converter too. No unburnt fuel going out the exhaust and no bangs and pops.

--- End quote ---
Where's the fun in that??!! :-DD :-DD

cmcraeslo:

--- Quote from: HighVoltage on August 04, 2020, 11:38:20 am ---Best to use is a current probe to watch the ECU signal.
Most of the time it is around 10 mA to 20 mA but some latest systems have less than 1 mA

Also, some systems use the amount of current from the ECU to the coils as a signal to get the
coil in to different mods. And others use the current as a feedback from the coils to tell the ECU how the last spark performed.

There are many different systems around these days.
What car is it and what is the coil being used?

--- End quote ---

If I understand correctly, you mean current probe on the wire from ECU to a 10k (as an example) pullup?
Test car I have is Mercedes Benz A160.
I have successfully tested this on a coilpack that has integrated drivers (VW).

cmcraeslo:

--- Quote from: Circlotron ---Are you making a rev limiter? If so, it might be easier to cut the drive to the fuel injectors instead. Easier on the catalytic converter too. No unburnt fuel going out the exhaust and no bangs and pops.

--- End quote ---

No, I'm making flatshift (ignition cut) device. I have it working on a coilpack that has integrated drivers, but when ECU is driving the coils directly, it doesn't work.

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