Abstract
This paper presents a design approach for the configuration synthesis of series-parallel hybrid transmissions with eight-bar mechanisms. The final design consists of 54 mechanisms with eight members and twelve joints including a simple planetary gear train (PGT) and a double planet PGT. Then, by using the techniques of power and clutch arrangements, new series-parallel hybrid transmissions are synthesized. The power arrangement process generates 97 clutchless hybrid systems. The clutch arrangement process generates 100 corresponding series-parallel transmissions. To demonstrate the feasibility of the synthesized configurations, a new hybrid transmission is selected as an example to analyze the working principle with operation modes and power flow paths.
Highlights
A series-parallel hybrid transmission system is a type of hybrid transmission system that uses a planetary gear train (PGT) to change the power flow paths of two power sources such as an internal combustion engine and an electric machine
The characteristics of power sources and the output are based on the operation is to develop new series-parallel hybrid transmission systems, the operation modes of new systems modes presented above
The mechanisms are used for synthesizing clutchless and clutched hybrid transmissions by using the techniques of power arrangement and clutch arrangement
Summary
A series-parallel hybrid transmission system is a type of hybrid transmission system that uses a planetary gear train (PGT) to change the power flow paths of two power sources such as an internal combustion engine and an electric machine. Toyota came up with the second and third generations of HSD [14,15] Most of these designs used a mechanism with two degrees of freedom (2-DoF) with one or two simple planetary gear trains (PGTs) without any clutch in the transmission. The clutches and brakes are engaged to control many flexible operation modes and improve vehicle performance and fuel economy [7]. Many other companies such as Honda, Renault, Nissan and Timken use clutches and brakes for their transmissions [19,20,21]. This work proposes an approach for the generation of all new feasible configurations for hybrid electric vehicles (HEVs).
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