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Technical Paper

Systematic Development of Hybrid Systems for Commercial Vehicles

2011-10-06
2011-28-0064
The reduction of CO₂ emissions represents a major goal of governments worldwide. In developed countries, approximately 20% of the CO₂ emissions originate from transport, one third of this from commercial vehicles. CO₂ emission legislation is in place for passenger cars in a number of major markets. For commercial vehicles such legislation was also already partly published or is under discussion. Furthermore the commercial vehicles market is very cost sensitive. Thus the major share of fuel cost in the total cost of ownership of commercial vehicles was already in the past a major driver for the development of efficient drivetrain solutions. These aspects make the use of new powertrain technologies, specifically hybridization, mandatory for future commercial powertrains. While some technologies offer a greater potential for CO₂ reduction than others, they might not represent the overall optimum with regard to the total cost of ownership.
Technical Paper

ISAD®-A Computer Controlled Integrated Starter-Alternator-Damper-System

1997-08-06
972660
This paper will present a system still in development that can be used both to generate electric energy and to start combustion engines. What's more, this system functions as multiband damper and takes over the complete flywheel function. Conventional technology as we know it today is briefly reviewed and subjected to a comparison with ISAD® technology. This paper contains system descriptions, readings and diagrams for various functions and a presentation of the whole system in a select trial vehicle. The results show that a system of this kind is not only capable of replacing current technology but can also cover all the (presently known) future requirements - noiseless start operation, low-vibration idle, acceleration boosting and an extremely powerful alternator (>6-10 kW at η > 80%), which allows, for example, for the electrification of all the vehicle's auxiliary aggregates. Significant fuel savings and emissions reductions are also achieved.
Technical Paper

Integrated Toolchain for Powertrain Optimization for Indian Commercial Vehicles

2015-01-14
2015-26-0032
Best fuel efficiency is one of the core requirements for commercial vehicles in India. Consequently it is a central challenge for commercial vehicle OEMs to optimize the entire powertrain, hence match engine, transmission and rear axle specifications best to the defined application. The very specific real world driving conditions in India (e.g. traffic situations, road conditions, driver behavior, etc.) and the large number of possible commercial powertrain combinations request an efficient and effective development methodology. This paper presents a methodology and tool chain to specify and develop commercial powertrains in a most efficient and effective way. The methodology is based on the measurement of real world driving scenarios, identification of representative Real World Driving Profiles and vehicle system simulation which allows extended analysis of the road topography, the traffic situation as well as the driver behavior.
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