General > General Technical Chat
Ignition systems
HighVoltage:
--- Quote from: SteveyG on October 01, 2021, 11:25:24 am ---
--- Quote from: HighVoltage on October 01, 2021, 09:50:38 am ---
--- Quote from: SteveyG on October 01, 2021, 08:52:59 am ---Modern coils are just HV generators, and will produce a high voltage the entire time the trigger signal is applied
--- End quote ---
I am not aware of such system.
Do you have an example of that setup?
--- End quote ---
A standard coil on plug is this type, 12V is applied all the time, there is a separate trigger pin. Search coil on plug and you'll see these types.
--- End quote ---
This system has been around for a very long time....
They can not "produce a high voltage the entire time", they work the same way as before and have to charge up the primary with energy before producing the high voltage at the output.
I am just developing a new ignition coil for an OEM.
The difference these days is that we have 30A primary current after only 100us of charge time.
And the secondary peak voltage must be >50kV, besides a few other crazy requirements.
SteveyG:
--- Quote from: HighVoltage on October 01, 2021, 01:13:50 pm ---This system has been around for a very long time....
They can not "produce a high voltage the entire time", they work the same way as before and have to charge up the primary with energy before producing the high voltage at the output.
--- End quote ---
I certainly have some in the garage somewhere 5 pin with integral diagnostics, I'll see if I can dig one out later for disassembly, I think they were branded Haldex, but I can't remember off-hand.
HighVoltage:
A few years ago, the 2 extra pins have been used to feed the OBD2 system.
These days the "intelligent" feedback information is all carried over one input signal wire.
Circlotron:
--- Quote from: HighVoltage on October 01, 2021, 01:13:50 pm ---I am just developing a new ignition coil for an OEM.
The difference these days is that we have 30A primary current after only 100us of charge time.
And the secondary peak voltage must be >50kV, besides a few other crazy requirements.
--- End quote ---
How much energy? Physically small coils don't give you much to work with. And why such high currents and short charge times? What's wrong with say 10A and 3mS? Less time for I2R dissipation in the primary?
langwadt:
--- Quote from: SteveyG on October 01, 2021, 01:13:39 pm ---General definition would be the "standard ignition coil" as the large cylinder type which would feed the distributor, not a COP type.
Looks like there are various COP configurations though. I think only the 3 pin coils are the type with just a transistor inside.
--- End quote ---
by standard I mean like it has been for decades, a coil and a switch to charge the primary. The coil is just on the plug and the switch is a transistor integrated in the coil. I don't think any one has used distributors in a very long time. The reliabilty issue and mechanics to drive it is probably expensive compared to a few extra coils.
Some coils are 3-4-5 pins, sometimes it is just extra grounds
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