06-16-2016, 01:15 PM
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#1 (permalink)
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Mercedes-Benz engines with 48-volt systems coming in 2017
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).
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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.
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06-16-2016, 05:49 PM
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#2 (permalink)
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Batman Junior
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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. |
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06-16-2016, 09:44 PM
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#3 (permalink)
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Master EcoModder
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Will these still have a 12v battery and use a DC-DC converter, or will all of the interior components run on 48v?
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06-16-2016, 11:51 PM
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#4 (permalink)
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Corporate imperialist
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Charging voltage on a "48 volt system" will have to be at least 56 volts.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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06-17-2016, 11:12 AM
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#5 (permalink)
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Administrator
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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.
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06-17-2016, 11:23 AM
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#6 (permalink)
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Batman Junior
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Quote:
Originally Posted by Ecky
Will these still have a 12v battery and use a DC-DC converter, or will all of the interior components run on 48v?
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I thought the article implied there would still be a small 12v battery.
EDIT: yup
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Cars can retain a cheaper 12-volt battery for lower-power accessories and run the high-draw systems on the 48-volt circuit.
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Not sure if that's a generic statement or if it applies to the Merc approach. |
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06-17-2016, 03:30 PM
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#7 (permalink)
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Master EcoModder
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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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