The electric-mechanical continuously variable transmission which is driven by electric motor
is a perfect type of transmission for electric vehicle. In this paper, the first objective is to address
recent patents on the configuration of electric-mechanical continuously variable transmission. The
second objective is optimization of the energy consumption of all-electric vehicle equipped with electric-
mechanical continuously variable transmission. Global optimization of electric vehicle equipped
with EMCVT running in New European Driving Cycle has been carried out based on dynamic programming. In this optimization
state of charge and transmission ratio these are state variable and decision variable, respectively. Ratio shifting
model was built to estimate energy consumption during shifting. New optimal control strategies were achieved by taking
shifting energy consumption as cost function. Test results show that shift times and energy consumed are both reduced
with this control strategy. Recent patents on the configuration of electric-mechanical continuously variable transmission
are also addressed.
Keywords: Electric-mechanical continuously variable transmission, electric vehicle, global optimization, shifting energy, test,
transmission ratios control.
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