Hybridizing powertrains of vehicles has been a popular solution to reduce fuel consumption. The power-split architecture offers advantages from both the series and parallel architectures. The two simplest power-split configurations are input coupled and output coupled transmissions. This paper presents a comparison between these two power-split configurations on a light weight hydraulic hybrid vehicle. The size of the pump/motors and gear ratios in the transmission are optimally selected to minimize the total loss for a standard federal driving cycle on each configuration. In the optimization process, in addition to the normal power-split operation, individual pump/motors were allowed to be locked up to reduce losses in the components. This results in each configuration being able to operate in four distinct modes. The optimization process then chooses the operation mode at each time instant to minimize the overall fuel consumption. Results show that mileage is similar for both architectures but the optimal pump/motor sizes of input coupled is slightly smaller and their operational characteristics are different. However, the two architectures present different challenges to controlling the vehicle dynamics, depending on whether control of the wheel speed or torque is desired. Applying the same optimization method, electric hybrid is briefly compared with hydraulic hybrid vehicle, and result shows they are comparable in fuel economy.
Comparison between input coupled and output coupled power-split configurations in hybrid vehicles
Vergleich zwischen Eingangs- und Ausgangsgekoppelten Kraftverzweigungskonfigurationen bei Fahrzeugen mit Hybridantrieb
2011
10 Seiten, 13 Bilder, 4 Tabellen, 11 Quellen
Conference paper
English
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