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―The hybrid vehicle has a good fuel economy with a electric type braking energy regeneration system. This paper introduced a novel pneumatic type braking energy regeneration system. The novel system use a scroll mechanism which have both compression function and expansion function. While vehicle is decelerating, the scroll machinery, being operated as a scroll compressor, compress a atmospheric air to save the vehicle’s kinetic energy and reuse a compressed air which is reserved in a air tank while vehicle is accelerating. In order to analyze fuel improvements by applying braking energy regeneration system to a vehicle, we simulated the rate of braking energy regeneration through CVS-75 mode driving patterns. Key words : Braking Energy Regeneration, Pneumatic Type, Scroll, Compression, Expansion Nomenclature  : power, kW P : pressure, bar : mass flow rate, kg/sV : volume,   or vehicle speed, m/sT: temperature, ℃: density,   : efficiency Subscripts comp, exp : compression, expansion t : tank a : atmospheric condition regen : regeneration

A Theoretical Study on Fuel Economy Improvements by Pneumatic Type Braking Energy Regeneration System Using the Scroll Mechanism