Sharif Digital Repository

One of the main and challenging stages in the development of hybrid vehicles (HEVs) is the conceptual design of its powertrain, which includes two parts: architecture design and sizing. This research aims to introduce a novel framework for conceptual design of HEV powertrains. By using this framework, not only the sizing of components is optimized but also the optimal architecture of powertrain is selected. In the proposed framework, by finding the optimal values of the powertrain design variables, including type of architecture and sizing variables (such as nominal powers, nominal torques, conversion ratios, etc.), the performance and the cost of hybrid vehicle is optimized in three layers... 

Hybridization of the vehicles is one of the main solutions for reducing the vehicles’ fuel consumption (FC) and emissions. Hybrid electric vehicles (HEVs) are one of the main groups of hybrid vehicles. In this type, an electric motor is employed to help the engine propel the vehicle. Other method which can be implemented to reduce the vehicle’s FC and emissions is to employ continuously variable transmission (CVT) as the vehicle power transmission. By using CVT, the engine will be able to operate in the rotational speed approximately independent of the vehicle speed, which leads to a reduction in the engine’ FC and emissions. One of the main concerns in the HEVs’ design is the layout of its...