PhD program HYBRID: Concepts for actuation on demand CVT’s

Vehicle manufacturers increasingly rely on hybrid power trains, which especially places certain requirements on vehicle transmission. Here, particularly the independence of the internal combustion engine’s transmission of gearbox oil supply is paramount. In order to realize concepts allowing an independent and on demand transmission of oil supply in CVTs, BOSCH originated the AoD project. The idea behind the actuation on demand is to reduce the amount of the CVTs required energy to the minimally necessary energy needed for actuation. Doing so, the focus lies on those operating conditions in which a high surplus of energy occurs. Especially the inherent and diversified requirement area of CVTs poses a particular challenge. In the following, two principles for actuation processes will be shown: the leakage optimized concept with ratio hold function and the accumulator concept.