The Multiple Advantages Of Gasoline Direct Injection ( Gdi ) Engine

916 WordsJun 7, 20164 Pages
The multiple advantages of Gasoline Direct Injection (GDI) engine have positioned this technology as the current trend for gasoline powertrains [1, 2]. Amongst GDI benefits, the increased power output, and improved engine efficiency [1, 3, 4] are the most advantageous. Therefore, GDI engines are framed in the drive for more efficient technologies and in the reduction of anthropogenic greenhouse gas emissions from transportation. However, the major concern about GDI engines is the increased particulate matter (PM) emissions compared to their counterparts Port Fuel Injection (PFI) engines [5, 6]. PM composition can vary depending on the engine operating condition. In the case of stoichiometric GDI engine operation, with optimized fuel injection timing, the PM formed contains a low level of soot. However, there are some circumstances, such as in cold start operation, which could lead to higher rates of soot formation due to the large fuel droplets formation and spray impingement. In the case of lean GDI engine operation, stratified charge promotes increased levels of soot as a result of the rich in fuel regions in the combustion chamber [7]. PM negative effects on human health and the environment have been broadly reported. In the work carried out by Jarvis et al [8], the carcinogenic and mutagenic behavior of polyaromatic hydrocarbons (PAHs) adsorbed in the carbonaceous core (soot) of PM is reported. Furthermore, researchers have provided evidence to link PM exposure to asthma
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