Bernhard Graf

100 HP / 200 Nm Diesel Motorcycle with 6 Speed Automated Manual Transmission

Diesel engines, especially CR (Common Rail) Dl (Direct Injection) TCI (Turbo Charged Inter-cooled), share a wide acceptance in the passenger car market due to the enormous torque and flexibility at low engine speed. A pre - condition for the use of a diesel engine in a motorcycle is that the disadvantages like combustion noise and visible smoke are reduced or eliminated. Moreover the fuel economy and performance characteristics of a diesel engine are dedicated to be used in a touring or large displacement motorcycle. The AVL engine concept is the first high performance diesel engine to be specially designed for motorcycles in terms of packaging and styling. To compensate for the limited engine speed range a gearbox with a wide ratio spread is required. This leads to a manual transmission with at least 6 gears or an automatic transmission. For the AVL concept an AMT (Automated Manual Transmission) was selected.

Vehicle integration of a new engine concept for 48 Volts – opportunities for efficiency improvement and optimization of the overall system complexity

To achieve fleet fuel consumption legislation of 95g/km CO2 in 2020, various electrification measures will be introduced, besides engine measures, to reduce the overall energy demand of the vehicle. 48V architecture represents an attractive compromise between the standard 12V system and high voltage hybrid systems. The 48V system offers on the one hand already attractive performance potential for moderate hybridization steps, on the other hand, opportunities open up for the electrification of the internal combustion engine (ICE) and its auxiliaries as well as other vehicle components with high power demand. Current belt starter-generator systems already realise direct recuperation and torque boost functions. Additionally they can support a highly effective electrical supercharging system which is clearly superior to current multi-stage turbocharging concepts, particularly in transient response. With flywheel startergenerator concepts, additional functions open up such as purely electric driving in a limited range, or simplification of the base engine towards the goal of a beltless engine. Demand controlled, electrical auxiliaries are already in series production for the cooling-, vacuum- or air conditioning systems. Additional areas of interest are the oil system and variable elements in the valve train or crank train.

Anforderungen an die virtuelle NVH-Optimierung von Antrieben in Fahrzeugen

Beside typical attributes like performance, drivability and fuel consumption, the NVH performance is one of the major criteria to characterize a vehicle and contributes significantly to the driving experience. On the other hand the mainstream in automotive industry is driven by CO2 reduction and as a consequence downsizing, lightweight designs, friction optimization and electrification are dominating the development landscape. Many of these tasks are in contradiction to NVH and therefore challenging the NVH development work.