Continuously Variable Transmissions (CVTs) can form a feasible alternative in transmissions due to its potential to 'freely choose' engine operating points with maximum engine efficiency at given vehicle speeds. This selection of maximum efficiency operating points can reduce fuel consumption of a vehicle considerably. Shifting the operating points from the conventional to the optimum efficiency points, however, decreases available torque reserve of the engine as these operating points will be located at lower engine speeds and higher loads. This decrease in reserve will have an undesirable effect on vehicle driveability, as the conventional operating line was calibrated in such a way that the operating points do give good driveability. It can be very beneficial to use,an 'upgraded' Integrated Starter Generator (ISG) systern in the powertrain with torque boost capabilities in order to restore or even improve driveability while running at higher efficiency engine operating points.This paper discusses the goals, the CAE simulation tool, the methodology used in the preparative study for evaluation and dimensioning of a CVT-ISG concept, as weil as the simulation results. The conclusions, generated from numerous simulations, provide vital information for the component selection, and for the development of the powertrain management system.
Simulation of a vehicle with an ICE, CVT, and ISG powertrain - a pre-study for concept evaluation and dimensioning
Simulation eines Fahrzeugs mit ICE, CVT und ISG-Antrieb: Eine Vorstudie für die Konzeptbewertung und Dimensionierung
2001
15 Seiten, 31 Bilder, 9 Tabellen, 4 Quellen
Conference paper
English
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