Technology
The University of Tokyo and Mitsubishi Motors jointly developed a system that controls the distribution
of driving power between the front and rear wheels automatically for smaller
power consumption and longer travel distance of a vehicle. The system automatically
calculates the driving power and the optimal power distribution using speed,
currency, and voltage while a vehicle is running. It calculates the
distribution four times in every 1.5 seconds. The research team used a PX-MiEV,
a Mitsubishi Motors’ sports utility vehicle, that has motors for each of the front
and rear wheels for the development. When compared with a conventional electric
vehicle with a 50:50 power distribution of a motor, the newly developed system
realized a decrease of about 1 kW in power consumption and an increase of about
20% travel distance for constant speed running of 50 km/h.
The University of Tokyo has been developing a system to increase the travel distance by
changing the distribution of motor’s driving power, but the problem with the
inability to maintain the optimal distribution because of the heat generated
while a vehicle is running remains unsolved. The research team will work on
increasing the efficiency in case of frequent acceleration and decreasing the search
time to put the technology into practical use. Mitsubishi Motors plans to launch
a plug-in-hybrid (PHV) based on the vehicle used in the experiment toward 2013.
Test drive of Mitsubishi
Motors’ MiEV on the road
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