Description
The subject matter of this thesis is the integrated design of the longitudinal dynamics for a parallel hybrid electric vehicle, where power units’ redundancy leads to an over-actuated behaviour. While the additional electric powertrain has the objective to increase the overall efficiency of the vehicle, the electrical machine can be included in the automation approach of the powertrain.
The increasing complexity of modern motor vehicles requires a lot of effort to control the motion dynamics not only on component level, but rather primarily on vehicle level. Model based methods provide the exact defined specification and realization of the vehicle’s dynamic behavior and at the same time takes the energy efficiency into account.
Based on these methods a hierarchical structure concept is developed, which allows a nearly independent processing of the main tasks: providing an interface to the human driver, increase of the energy efficiency and design of the vehicle’s longitudinal behaviour. Concerning the longitudinal dynamics’ design, a new approach is presented for powertrain automation, which addresses especially load changes at the friction clutches used in the double clutch transmission. This results in an overall concept that provides a transparent wheel torque behaviour to the driver, while at the same time, the distribution of control variables to redundant actuators has no effect on the longitudinal dynamics. Finally various simulations with a detailed vehicle simulation model demonstrate the proper operation of the approach for longitudinal dynamics’ control of parallel hybrid electric vehicles. Additionally the new approach for powertrain automation with friction clutches is evaluated based on test rig measurements.
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