Power Assist Recuperation System (PARS™) for automotive fuel saving and e-boost

A novel Power Assist Recuperation System consisted of motor, inverter, DC-DC converter and 48V Li-ion battery has been presented for fuel saving of conventional Internal Combustion Engine and hybrid vehicles. As a total solution of the next-generation 48V PARS, key components such as Permanent Magnet motor, MOSFET power switching inverter and bi-directional DC-DC converter with cost competitiveness from in-house power IC's and power modules have been optimized based on the 48V battery pack for quick charge and discharge. A deep flux weakening control has been evaluated for the PM motor's high speed operation. The specific value of how much the proposed 48V PARS can reduce CO2 emission and fuel consumption was numerically simulated by using both motoring and generating efficiency maps as input data. It is noticed that the present 48V PARS gives a considerably enhanced performance in fuel saving by as high as 17% for a commercial 1.8L gasoline engine during the Urban Dynamometer Driving Schedule mode.

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