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Rewriting the Rules of Internal Combustion; Mercedes engine is part diesel, part spark ignition.(News)
Byline: J.P. VETTRAINO
The demise of the internal combustion engine has been greatly exaggerated, or so Mercedes-Benz thinks.
Mercedes' advanced engineering staff believes spark-ignition and diesel engines are a long way from tapped out, even after 100-plus years of development, and that internal combustion will remain the workhorse in transportation and power equipment for decades to come.
To demonstrate its point, Mercedes is developing a new, small-displacement engine known internally as the Dies-Otto. A Dies-Otto engine will debut in an S-Class sedan at this year's Frankfurt motor show and could be in production long before alternatives like fuel-cell propulsion.
"The deepest potential in internal combustion has yet to be exploited,'' says Herbert Kohler, vice president of advanced engineering and chief environmental officer at Daimler AG. "We have diesels that are as clean as gasoline engines, and we expect gas engines as efficient as diesels. Dies-Otto is one of several possible next steps.''
The Dies-Otto is fueled by direct gasoline injection and operates as both a four-stroke (Otto Cycle) spark-ignition engine and compression-ignition (diesel) engine. While the dual-mode ignition is its defining trait, the Dies-Otto integrates and optimizes nearly every significant internal combustion development of the last 20 years, including direct injection, piezo injectors, variable valve ...
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