Abstract
KEYWORDS – gear shifts, hybrid mode changes, hybrid powertrain, dog clutch, powertrain dynamics
ABSTRACT
Plug-in hybrid vehicles and extended-range electric vehicles are commonly seen as a promising way to reduce CO2 emissions but they are still expensive due to the multitude and the complexity of the powertrain components. One way to reduce cost, mass and installation space is to increase the level of system integration. The presented parallel-series hybrid powertrain, called Two-Drive-Transmission, shows a high level of functional integration, one example of which is the use of the electric traction machines for the speed synchronization during gear shifts and hybrid mode changes. Therefore it is possible to avoid friction clutches or synchronizers by using dog clutches. The goal of this paper is to systematically analyze gear shifts and mode changes with dog clutches and to investigate the effects on the longitudinal dynamics of the vehicle.