Mercedes Power Unit Hardware & Software

[PlatinumZealot]

They got alot of the little details quite well though.

[FrukostScones]

passive pre-chamber (laser?) ignition in Merc PU

https://translate.google.de/translate?s ... t=&act=url

[FW17]

what is Vorkammerentzündung?

[FW17]

If they are using pre-chamber, should that be considered as direct injection?

[gandharva]

AMUS is talking about a special spark plug that features a perforated thimble. This spark creates some sort of "fat-cloud" in the combustion chamber. It's exposion has enough energy to completely ignite the rest of the mixture. I think this fat-cloud is what they mean when they talk about the pre-chamber-ignition.

[markc]

what is Vorkammerentzündung?

Vorkammer = Pre chamber
entzundung = inflamation

so translated = pre chamber ignition.

[GPR-A duplicate2]

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[matt21]

Mercedes has a patent on this kind of ignition.
I have not managed to find a English version yet

[dans79]

I think this fat-cloud is what they mean when they talk about the pre-chamber-ignition.

A pre chamber, is a completely different chamber. Google "pre chamber ignition" and you will see a lot of images like this one.

[Frank_]

chamber in the piston crown maybe ? akin to my diesel one

[godlameroso]

More pronounced plasma arc from the plug?

[gandharva]

I think this fat-cloud is what they mean when they talk about the pre-chamber-ignition.

A pre chamber, is a completely different chamber. Google "pre chamber ignition" and you will see a lot of images like this one.
http://world.honda.com/history/challeng ... pho_03.jpg

I am absolutely aware of this, but the AMUS description does not point into that direction. According to that AMUS article there seems to be no additional physical chamber. They describe it more like a 2-step ignition process to increase efficiency.

[ringo]

chamber in the piston crown maybe ? akin to my diesel one

http://i65.tinypic.com/2ufrfvl.jpg

This sounds more like it to me. There is ignition in that little pocket initially.

[Frank_]

chamber in the piston crown maybe ? akin to my diesel one

http://i65.tinypic.com/2ufrfvl.jpg

This sounds more like it to me. There is ignition in that little pocket initially.

aye spark onto the pilot injection, then progressively inject the rest of the fuel into that little fireball in the chamber ?
keeps the heat away from the cylinder walls (thermal efficiency)

[OO7]

Sounds similar to how a flameholder in an afterburning turbojet/turbofan engine works.