Development of control strategies and transmission model for attribute simulations of a diesel HEV with split-power CVT

In the year 2002/2003, the mechanical engineering and design project SIRIUS, performed at LuleƄ university of technology, was assigned to develop the electromechanical continuously variable transmission (CVT) Pergear, for use in a hybrid electric vehicle (HEV).

The concept was developed by Ph.D. Per Mattsson and had until then only been simulated and evaluated without regard concerning packaging and authentic mechanical solutions.

It became obvious that the powertrain concept, i.e. combustion engine, electric machines, gearbox etc, was somewhat space consuming to be installed in a production vehicle. With this in mind, a strategy involving a smaller combustion engine and thereby a more compact transmission needed to be investigated.

Other desirable factors needed investigation and development, e.g. creating a physical simulation model for the transmission, investigating control possibilities and developing fundamental control strategies.

To investigate these questions and to develop the transmission concept the master thesis project presented in this thesis was initiated. The thesis involves for instance the development of engine control, electric charge fundamentals, physical model simulations and comparisons to conventional vehicles.

The model was to be used for performance and fuel consumption simulations, but also to eventually evaluate dimensions of electric machines and the hybrid battery.

The results obtained using the vehicle model is presented in this thesis while also the modeling strategies along with driveability issues are discussed. The concept has proven to be a worthy competitor both concerning fuel economy and performance.

Author: Tjarnberg, Joel

Source: Lulea University of Technology

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