DaimlerChrysler brought its latest generation of diesel-hybrid drivetrain to NAIAS in the form of its S-Class “Hybrid” concept car that promises fuel efficiency of 34 mpg (6.9 liters/100 km).
This concept represents DaimlerChrysler’s basis for the co-development of advanced hybrid technology with GM. Mercedes-Benz will focus on the development of premium-class rear-wheel drive cars with a hybrid unit.
“Our technology is ideally matched to powerful engines. We thus ensure a high level of driving dynamics and enhanced comfort at the same time as significantly reduced fuel consumption,” said Dr. Thomas Weber, member of the Board of Management of DaimlerChrysler AG with responsibility for research and technology and the development of the Mercedes Car Group.
The hybrid drivetrain in the new Mercedes-Benz S-Class “Hybrid” develops a maximum power of 241 kW (340 hp)—a new record for cars with hybrid drive systems. A V-8 CDI diesel engine develops 191 kW (260 hp) and 560 Nm (413 lb-ft) of torque. Two electric motors offer a combined output of 50 kW (hp) and are powered by a 1.9 kWh nickel-metal hydride battery in the trunk of the vehicle. Energy is recovered during braking, and the V-8 diesel engine recharges the battery while the vehicle is in motion.
The S-Class Hybrid accelerates from 0 to 100 km/h (62.1 mph) in 7.6 seconds.
The DaimlerChrysler hybrid system packages two electric motors (the P1/2 hybrid transmission) with a transmission based on its 7G-Tronic automatic transmission.
This implementation of the hybrid concept is designed to ensure that the diesel can constantly operate in the most fuel-efficient range.
“This reduces fuel consumption by 15 to 25 percent depending on the driving cycle, while at the same time enhancing comfort,” says Prof. Herbert Kohler, Head of the Vehicle Body and Drive Systems Directorate at DaimlerChrysler AG. “Fuel consumption amounts to 34 miles per gallon, or about seven liters per 100 kilometers.”
It will be interesting to see the results of road trials. Mercedes had earlier rolled out a diesel-hybrid prototype, only to be surprised by static or slightly worse fuel consumption during highway driving.
This fuel consumption improvement is comparable to what GM is promising with its current implementation of its Advanced Hybrid System II—its basis for the partnership.