Continuous Improvement of the Conventional Combustion Engine
Jun 07, 2005
Dr. Leopold Mikulic, Vice President, Head of Powertrain Development, Mercedes Car Group, DaimlerChrysler AG
Bob Lee, Vice President, Powertrain, Chrysler Group
Mercedes-Benz Vision SLK 320 CDI TRITURBO
Technical Data
Vehicle Type: Two-passenger compact sports roadster
Engine: V-6 Diesel engine
Displacement: 2987 cc
Compression ratio: 18 : 1
Horsepower @ rpm: 282 hp @ 1,750 – 2,700 rpm
Torque: 630 Nm @1,750 – 2,700 rpm
Intake system: Common-rail direct injection, turbocharger, EDC
Transmission: Seven-speed automatic 7G-TRONIC
0-60 mph: 5.1 seconds
Top speed: 155 mph (electronically limited)
Fuel mileage: 31.3 mpg*
Fuel tank: 18.5 gal/70 litres
Range: 580 mile driving range
*NEDC comb.
Mercedes-Benz E320 DT Laredo Go – Record Vehicle
Technical Data
Vehicle Type: Five-passenger luxury/performance sedan
Engine: V-6 Diesel engine
Displacement: 2987 cc
Compression ratio: 18 : 1
Horsepower @ rpm: 224 hp @ 3,800 rpm
Torque: 510 Nm @1,600 – 2,800 rpm
Intake system: Common-rail direct injection, turbocharger, EDC
Transmission: Five-speed automatic
0-60 mph: 7.1 seconds
Top speed: 151 mph (electronically limited)
Fuel mileage: 29.7 mpg*
Fuel tank: 21.1 gal/80 litres
Range: 620 mile driving range
*NEDC comb.
New V-6 Diesel Engine by Mercedes-Benz
As the successor to the five and six-cylinder in-line engines the new V6 diesel engine offers an increase in output and torque of up to 38 percent, ensuring faster acceleration, brisk intermediate sprints and a higher top speed. The maximum torque of 510 Newton metres is already available from 1,600 rpm, and remains constant up to 2,800 rpm.
Accordingly the new V6 has torque characteristics which are unsurpassed in the displacement class. In combination with the unique 7G-TRONIC seven-speed automatic transmission, this ensures the best possible exploitation of the remarkable output and torque potential in any driving situation.
As a would first for a diesel engine in this displacement and output class, Mercedes-Benz has developed an aluminum crankcase with cast-in grey iron cylinder liners for this unit which makes a major contribution to weight reduction. As a result, the new V6 weighs a total of only approx. 208 kilograms (acc. To DIN) and its power-to-weight ration has increased by more than 20 percent to 0.79 kW/kg.
Thanks to this precise engine management system, the nitrogen oxide and particulate emissions of the V6 engine are within the strict limits of the EU4 standard. Two ozidising catalytic converters are responsible for conversion of the carbon monoxide and hydrocarbons: a light-off converter located near the engine and a main converter in an underfloor location. To reduce soot emissions even further, Mercedes-Benz offers a maintenance-free particulate filter system which is standard equipment for the V6 in Germany, Austria, Switzerland and the Netherlands.
Mercedes-Benz Seven-Speed Automatic 7G-TRONIC
7G-TRONIC, the world’s first and only automatic transmission of its kind for cars, offers a number of technical innovations which ensure powerful acceleration, more rapid mid-range sprints, a more favorable fuel consumption and greater gear shifting comfort.
Increasing the number of forward gears from the previous five to seven allows a wider spread of rations, as well as further reducing the difference in engine speed between the individual gears achieved by a five-speed transmission. As a result, the driver can rely on having the optimum ratio at his or her disposal for virtually any driving situation. This impressive engine speed adjustment system opens the door to lower noise as well as improved fuel economy.
Mercedes engineers have achieved further important advanced where shift control is concerned: if the driver needs to accelerate quickly and therefore change down rapidly through several gears – i.e. kick-down – 7G-TRONIC uses its direct downshift capability, shifting down by as many as four gears – as the situation requires – rather than just one at a time.
The seven-speed automatic transmission also features a torque converter lockup clutch. This is located in the hydrodynamic torque converter and largely eliminates slip between the impeller and the turbine wheel in many operating situations. In contrast to convention automatic transmissions, where the converter can only be locked up in higher gears, the lock-up clutch is the seven-speed automatic transmission by Mercedes-Benz is already active in first gear.
MDS Technology
MDS is a fuel-saving technology that is here today – customers get the power and capability of the HEMI® V-8 that they desire with the fuel economy of a less powerful engine.
Chrysler Group was the first to offer modern, large-volume vehicles in North America with cylinder deactivation – the HEMI-powered 2005 Chrysler 300C and Dodge Magnum R/T went on sale in the spring of 2004.
Chrysler Group was also the first to offer cylinder deactivation in an SUV with the introduction of the 2005 HEMI-powered Jeep® Grand Cherokee.
The Chrysler Group MDS is standard equipment on Chrysler 300C and Dodge Magnum R/T, Charger R/T and standard on HEMI-powered 2005 Jeep Grand Cherokee and Jeep Commander.
MDS delivers an improvement in fuel economy of up to 20 percent.
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