Innovative Dedicated Hybrid Transmission Concepts in the Next Generation of Hybrid Powertrains

Analysis of hybrid vehicle transmissions with any number of modes and planetary gearing: kinematics, power flows, mechanical power losses

“…The clutch E prevents the ICE from moving and provides the reaction torque on the input shaft during full-electric functioning. Clutches could be engaged in 2 5 = 32 different arrangements, of which 16 are potential FEV modes (clutch E engaged) and the remaining 16 potential power-split hybrid operations [15]. However, not all alternatives are suitable for vehicle propulsion with available power on the output shaft.…”

Design of a Hybrid Electric Power-Split Transmission for Braking Energy Recovery in a Drilling Rig

“…Thus, it is apparent that the screening and selection of the best constructive layout cannot be effectively fulfilled by the designer alone, who instead should rely on computer-aided design techniques. An alternative approach for power-split transmissions design is based on the optimization of the most promising mature technologies available on the market [18][19][20][21]. However, this procedure is unsuitable to meet specific functional requirements, especially outside the automotive field, given the limited number of already implemented solutions.…”

Power Losses Minimization for Optimal Operating Maps in Power-Split HEVs: A Case Study on the Chevrolet Volt

“…The power flows within the powertrain are handled by a power-split unit (PSU) made up of planetary gear sets (PGs) and ordinary gear sets (OGs). Multi-PG PSU enables the minimization of the electric machines' power size by deploying a multi-mode power-split continuously variable transmission (PS-CVT), where some clutches operations lead to several constructive arrangements to select under the desired driving conditions [6][7][8][9][10]. Nevertheless, the more complex the transmission constructive layout is, the trickiest the identification of the occurring power flows is [11][12][13], as well as their management [14][15][16][17].…”