Mercedes Benz DiesOtto inline-4 engine concept
Click image above to enlarge diagram view
DaimlerChrysler has revealed details on what could be the successor to the current 1.8 liter E18 M271 used as Mercedes Benz’s flagship inline-4 engine. Quite a few car manufacturers have been combining the best qualities of both a petrol engine and a diesel engine, and this is DaimlerChrysler’s attempt called the DiesOtto concept.
This 1.8 liter DOHC inline-4 engine with variable valve control can produce 238 horsepower and 400Nm of torque, but consumes less than 6 liters of fuel per 100km – not on a small car but in the current Mercedes Benz S-Class!
Instead of the M271’s Kompressor supercharging, the DiesOtto uses turbocharging combined with direct injection. Now this is where the diesel characteristics come in – there is a special controlled auto ignition mode during low to medium engine speeds on low loads which ignites the air-fuel mixture through compression alone without spark ignition – this is called homogeneous combustion. For better emissions, the DiesOtto engine has a standard three-way catalytic converter
The DiesOtto will not be available in the market anytime soon, instead DaimlerChrysler will slowly be adding features from the DiesOtto concept to it’s production inline-4 engine one by one until the full concept is realised.
Technologies such as direct injection are already in production, and my guess is the next step would be for the Mercedes Benz inline-4 engines to go the turbocharging route instead of using a supercharger.
Have a look at the related posts below to read about engines with similar concepts being developed by other car manufacturers.
Related Posts:
Homogeneous Charge Compression Ignition
Volkswagen gives sneak preview of future engine projects
Mercedes Benz inline-4 engines: M266 vs M271
July 26, 2007 @ 9:31 am
very impressive engine and the house power / torque.. awesome for a 1.8liter machine dude.
6 liters for 100km is among the best in this category.
RM1.92×6 = RM11.52/100km ~ RM0.115 per km.
come close to 1liter engine fuel consumption.
i would say this will bring big impact to the autoworld as ppl now talking about hybrid etc…
Good job Mecs.. but what will be the price? not many malaysian can affort this laa.
July 26, 2007 @ 9:49 am
yet , its not an award winnig 5.0L engine…
July 26, 2007 @ 9:50 am
szw: that is because it does not exist yet
July 26, 2007 @ 2:36 pm
fantastic engine
July 26, 2007 @ 3:11 pm
Award winning engines are for engineers and geeks to wank over. It doesn’t necessarily equate to better (relatively) consumer experience.
July 26, 2007 @ 3:49 pm
-from car scoop-
“Like most European automakers, Mercedes has already accomplished creating economical diesel units as clean and as powerful as gasoline engines. Now Mercedes’ next goal is to make the gasoline engine as frugal as a diesel unit. The “DiesOtto†concept, which incorporates the foremost strengths of both the petrol and diesel engines, is the first step towards that goal. The DiesOtto’s package includes technology features such as direct gasoline injection, turbocharging, a variable compression ratio, a hybrid module with an integrated starter/generator and most importantly, the controlled auto ignition, a highly efficient combustion process similar to that of a diesel.‗——carscoop-july 25th 07
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proton GL said,
April 17, 2007 @ 4:19 pm
cold start combustion is easily resolve with some kind initial ignition, or glow plug, etc.
my doubt is the capabilty for higher speed engine, theres a posibility a preignition happened before TDC due to heat built up, which destruct the engine,
due to non regulated ignition, they might want to have somekind of variable copression ratio in relation with engine speed or load, perhaps a small clyinder/piston built in the chamber to alter volume of the chamber hence the reduce the comp ratio for extreme condition,
—-(previous discussion found pauls rave and rants,)
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so,suprisingly Mercedes did say about ‘variable compression ratio’ which make possible of controlled auto ignition, and sparkplug ignition under load variation of engine load, (lower compression tuned for spark plug ignition when engine in higher load )
just wonder how they execute this variable compression ratio mechanically ..
July 26, 2007 @ 11:38 pm
fantastically rough engine i would assume.
BTW Paul, DaimlerCHRYSLER ? Ain’t it shold to Cerberus? Should be Daimler Benz again right?
July 27, 2007 @ 3:51 am
ingolstadt: they have not legally changed their name yet, so it remains daimlerchrysler
July 27, 2007 @ 4:23 pm
One of the easy way to reduce compression is to delay the intake valve timing. so effectively you’ll get smaller capacity output. However, judging from the incredible power output. I also wonder if they are using some other technique.
It seems that petrol direct injection is off, if you guys seen the complicated system that is employed in a volkswagen FSI, you’ll really question why go through so much trouble?
July 27, 2007 @ 5:48 pm
good idea jamesbong,
but under engine heavy load/high revs the fuel injection occured during intake stroke,
if delaying intake valve closure during compression stroke it might pump out some of the mixture to the intake manifold,
well this works fine in miller cycle engine since its the intake manifold is in pressurised by the supercharger,
this is self ignited combination, is to belived more fuel saving then direc injection,
thats why they re trying,
but i agree with you, it add to the complexity, since compression ratio need to be varied, while its not needed in direct injection,
August 14, 2007 @ 2:27 pm
[...] of some sort. Instead, the Mercedes-Benz F700 will be powered by the recently announced 1.8 liter DiesOtto engine, capable of power outputs of 238 horsepower and 400Nm of torque, yet using less than 6 liters of [...]