Comparison of P2 off axis and P2.5 HEV modules in terms of impact of e-machine in the hybrid dual clutch transmission architecture

Increasing concerns about global warming as well as oil and resource depletion have led to more stringent regulations linked to fuel economy, emissions, and energy conservation, in the automotive industry, this has created an incentive to focus efforts on alternative powertrain technologies, in this context, fully electric, hybrid and plug‐in hybrid electric vehicles (BEVs, HEVs, PHEVs) have gained an increasing momentum in the market. Several hybrid architectures are available in the market and differ from each other based on the position of the electric machine and how it is connected to the transmission system, they can be of many types ranging from P0 to P4. The purpose of this thesis is the study and do a comparison of two models, P2 off axis and P2.5 HEV in terms of impact of the EM on the overall hybrid architecture. In this thesis, two types of analysis have been carried out. First one is the linear torsional analysis, that has been conducted to understand the role of EM inertia on the natural frequencies of the modelled system, Natural frequencies and Campbell diagram were obtained to study the critical speeds and vibration modes for different cases corresponding to all the gears of the DCT. Also, the energy contribution of all the elements in the system for the different vibration modes was calculated, MATLAB and SIMULINK are used for modelling and analysis. The second analysis is the flexural analysis that was performed to understand the misalignment of the shafts due to the forces conducted by the helical gears. SOLIDWORKS software was used to create the simplified model of the transmission component and later FEM analysis was carried out to obtain the deformations and stress caused by the EM torque transmission. Finally, a comparison was made between the results obtained in both the configurations.