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V. N. Supe, V.P.Waghmare, N.B.Chopade

Fuel pricing, CO2 emission and conservation of nature have become a hot topic on the international agenda. Due to CO2 emission and other factors global warming is increasing drastically and it is a topic of discussion among engineers, environment mentors and researchers globally. The past decade is driven largely by an effort to meet legislated carbon emissions reduction goals for vehicle fleets. The automakers have introduced technologies that enable internal combustion engines (ICEs) to turn off automatically when vehicles are stopped. These stop-start vehicles are also known as micro hybrids, idle stop vehicles, and a variety of names branded by automakers. These vehicles can offer significant reductions in fuel consumption and CO2 emissions, although the actual saving depends heavily on the drive cycle. Stop-start vehicles require more robust batteries and starter systems than are found in internal combustion engine vehicles and are priced at a small premium over ICEs but considerably less than hybrid vehicles. With the most aggressive environmental goals in the world, Europe has seen so far the greatest selection of vehicles with stop-start technology and, not surprisingly, the greatest volume of vehicles (cars) sold. North America has experienced a relatively slow penetration of the technology due to less stringent emissions reduction goals and an Environmental Protection Agency (EPA) testing cycle that underestimates the benefits of the technology. Worldwide, Pike Research expects more than 41 million of these vehicles (car) to be sold annually by 2020 – nearly a tenfold increase over 2012 sales.