Power Split Architecture : Power Divided

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Power Split Architecture
Power-split hybrid powertrain are ones which consists of power-split device (PSD), an Internal Combustion Engine (ICE), two Electric Machines (EMs), ESS and VCC. Power-split architectures is a match between series and parallel hybrid to obtain advantages of both series and parallel hybrid architectures. The produced engine torque is split into two parts, which are further delivered to the output shaft by the means of an efficient mechanical path and another less efficient electric path. PGS has two important aspects:
• Rotation speed of three ports (sun gear, ring gear and carrier gear). Rotation of engine can be controlled to perform within peak-efficiency zone
• Torques into the three ports of PSG should be in proportion to each other.
So electric machines should have more output torques and power-split hybrid architectures are not useful for micro and mild hybrid electric vehicle, unlike parallel architectures. Since engine can always perform efficiently, power-split electric vehicles can reach remarkable fuel efficiency improvement and currently are the most dominant in hybrid vehicle sector .However, this architecture has its own drawbacks. This type of powertrain also suffers from limitations because of the PSG. For instance, the ratio of power via the two different paths relies mostly upon the speed of vehicle. So these power-split hybrid vehicles are mostly efficient only within a particular speed range, or else, the overall efficiency will
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