Novel Shift Control without Clutch Slip in Hybrid Transmissions

Paper #:
  • 2017-01-1110

Published:
  • 2017-03-28
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Abstract:
With the introduction of new regulations on emissions, fuel efficiency and driving cycles, challenges for the powertrains are significantly increasing to a new level. During the transition phase for these new targets, hybrid-electric powertrains are an unquestioned option for short and long-term solutions. Hybridization however, not only brings benefits on these challenging efficiency or emission targets, but also allows numerous new possibilities on controls of different powertrain elements as well as new approaches of design of powertrain elements. A good example is transmissions where, hybridization allows a new transmission type called Dedicated Hybrid Transmission (DHT), which enables to use novel control strategies bringing improved performance, driveability, durability and NVH behavior. This paper focuses on the novel shift strategy where friction clutches do not have to slip. The strategy introduces a novel shifting control using the integrated electric motor and special structures of dedicated hybrid transmissions. The novel shift strategy improves shift comfort, thermal losses and element durability significantly. In addition, several design aspects are challenged by proposing questions; selection of dog clutches over friction clutches, usage of eCVT modes in DHT, how a DHT shall be designed, etc.
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