Future-Oriented Propulsion Systems
Washington/Stuttgart
Jun 07, 2005
Presenters:
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
Exhibits:
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
Performance
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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