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Daox	06-16-2016 12:15 PM

Mercedes-Benz engines with 48-volt systems coming in 2017

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Well, someone is finally doing it. There has been talk of this for ages now. Its good to see someone stepping out.

Mercedes-Benz engines with 48-volt systems coming in 2017 - Autoblog

Quote:

Mercedes will use the 48-volt systems to power mild-hybrid functions like energy recuperation (commonly called brake regeneration), engine stop-start, electric boost, and even moving a car from a stop on electric power alone. These features will be enabled through either an integrated starter-generator (Mercedes abbreviates it ISG) or a belt-driven generator (RSG).

...

The industry is moving toward 48-volt power, with the SAE working on a standard for the systems and Delphi claiming a 10-percent increase in fuel economy for cars that make the switch.

MetroMPG

06-16-2016 04:49 PM

I heard about that lethal 50v threshold a few times when we were building the ForkenSwift.

Which makes me wonder: as a 48v nominal system, the running voltage will probably be higher than 50. Is it still "safe" in terms of the 50v threshold?

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Also: I find it funny that they're marketing this as a voltage upgrade rather than as a "mild" hybrid, because it adds the same features that mild hybridization does.

Ecky	06-16-2016 08:44 PM

Will these still have a 12v battery and use a DC-DC converter, or will all of the interior components run on 48v?

oil pan 4

06-16-2016 10:51 PM

Charging voltage on a "48 volt system" will have to be at least 56 volts.

Daox	06-17-2016 10:12 AM

I would imagine they would use a 48V battery with components running at 48V. If thats the way the industry is moving you might as well go for it.

MetroMPG

06-17-2016 10:23 AM

Quote:

Originally Posted by Ecky (Post 516513)

Will these still have a 12v battery and use a DC-DC converter, or will all of the interior components run on 48v?

I thought the article implied there would still be a small 12v battery.

EDIT: yup

Quote:

Cars can retain a cheaper 12-volt battery for lower-power accessories and run the high-draw systems on the 48-volt circuit.

Not sure if that's a generic statement or if it applies to the Merc approach.

Ecky	06-17-2016 02:30 PM

I'm inclined to think they'll go with a single lithium pack though, with a bit more capacity than 4x 12v lead acids would have, for mild-hybrid functions.

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