Future-Oriented Propulsion Systems
Jun 07, 2005
Prof. Herbert Kohler, Vice President, Body and Powertrain Research and Chief Environmental Officer, DaimlerChrysler AG
Dr. Andreas Truckenbrodt, Executive Director, Hybrid Powertrain Programs, DaimlerChrysler AG
Mercedes Benz Bionic Car
Technical Data
Vehicle Type: Mercedes-Benz concept car
Engine: 4-cylinder Diesel engine
Displacement: 1991 cc
Horsepower: 140 hp
Torque: 300 Nm @ 1,600 – 3,000 rpm
Intake system: Common-rail direct injection, particulate filter, selective catalytic reduction (SCR)
Transmission: AUTOTRONIC continuously variable automatic transmission
0-60 mph: 7.9 seconds
Top speed: 118 mph
Fuel mileage: 70 mpg*
Fuel tank: 14.3 gal / 54 litres
Range: 746 mile driving range
* NEDC comb./FTP 75
Clean Passenger Car Diesel Engine (Selective Catalytic Reduction)
Motivation and Challenge
  • Diesel engines have the advantage of higher fuel efficiency and lower CO2 emission compared to gasoline engines.
  • Emission limits for NOx, particulate matters, hydrocarbons and CO will be further reduced in the next years to very low level.
  • High efficient systems for combustion and exhaust aftertreatment have been developed to reach these limits with diesel technology.
Technical Approach
  • Diesel engine with latest fuel injection technology (common-rail system) and optimized combustion concept.
  • Particulate filter with catalytic coating.
  • Urea-based SCR system (SCR = selective catalytic reduction) for minimized NOx emission.
SKO Body Structure (Soft Kill Option)
Learning from nature
  • DaimlerChrysler is using biological motivated algorithms in order to reduce the weight of car body structures.
  • For the first time, Prof. C. Mattheck has investigated biological design principles of trees and bones, which underlie the axiom of homogenous stress distribution.
  • By applying these principles to analogous software algorithms technical structures can be optimized by simulating the load-adapted growth in nature.
  • DaimlerChrysler Research is using the SKO-method (Soft Kill Option), which simulates the adaptive mineralization process of bones: Highly loaded areas are stiffened, whereas unloaded zones are removed.
  • This rule was implemented in a Finite-Element Algorithm as the basic principle for a numerical topology optimization. The result of such an optimization is a weight-reduced design proposal similar to the microstructure of bones.
  • This method is applied in an iterative process until a homogenous stress distribution in the structure is reached.
B-Class F-Cell
The new Mercedes-Benz B-Class “F-Cell” is extending the family of fuel cell vehicles to the segment of sports tourers. The B-Class, an automobile for travel, family and leisure, incorporates a unique sandwich concept developed by Mercedes-Benz that makes it predestined for this type of drive unit.
Sporty, dynamic driving is reconcilable with emission-free operation, as is impressively demonstrated by the technical data: the high-torque electric motor will develop more than 100 kW; this amounts to 35 kW more than the power unit of the predecessor generation, the A-Class “F-Cell”.
Thanks to a reduction in fuel consumption and a further enhanced storage capacity, the operating range has now been increased to almost 400 km (250 miles). The components’ reliability and longevity have also been further improved.
DaimlerChrysler P1/2 Transmission Hybrid-Drivetrain
With its progressive P1/2 transmission, DaimlerChrysler has developed a hybrid technology that combines a powerful drivetrain with a highly efficient design concept, while at the same time meeting the highest demands in terms of driving dynamics and comfort.
The use of the 7G-Tronic automatic transmission makes for a very high comfort level, as shifting is even faster and more convenient in continuously variable mode.
The design of the drivetrain is surprisingly simple but highly efficient: Unlike many conventional hybrids, the system dispenses with a torque converter; this is replaced by the hybrid-specific components. The hybrid concept is based on the 7G-Tronic automatic transmission in combination with the P1/2 hybrid transmission, which thanks to its compact dimensions does not restrict interior space.
The electric motors are powered by a 1.9 kWh nickel-metal hydride battery. The two electric motors, which have a combined output of 50 kW/70 hp, make for optimized ride comfort and acceleration. Thanks to the second electric motor, the motor can be started at any time without transition, independently of driving mode.
DaimlerChrysler/GM Two-Mode Hybrid System
The two-mode hybrid system surpasses traditional hybrid design by improving fuel economy and performance at higher speeds as well as city driving cycles - up to 25 percent.
This joint effort will allow us to speed up the development of the two-mode hybrid technology by leveraging the combined engineering talent of DaimlerChrysler and GM.
The efficient packaging of the two-mode system enables faster proliferation to a wide range of vehicles from compact cars to pickup trucks.
The first DaimlerChrysler product featuring the two-mode system will be in 2008 with the Dodge Durango.
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