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http://dx.doi.org/10.7467/KSAE.2017.25.3.297

Experimental and Numerical Assessment of the Effects of Various Coolant Temperature in Gasoline Vehicle on Fuel Consumption and Emissions  

Jeong, SooJin (Division of Corporation Support, Korea Automotive Technology Institute)
Kim, SeoKyu (R&D Center, Inzi Controls Co., Ltd.)
Lee, GumSu (R&D Center, Inzi Controls Co., Ltd.)
Jeong, Jinwoo (R&D Center, Inzi Controls Co., Ltd.)
Kim, MyungHwan (Advanced Simulation Technologies, AVL Korea)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.25, no.3, 2017 , pp. 297-308 More about this Journal
Abstract
One of the major engine thermal management system(TMS) strategies for improving fuel economy is to operate the engine in high temperatures. Therefore, this work performed a numerical and experimental study to examine the effect of several different STOs(Starting Temperature of Opening) of wax-thermostat, ranging from $85^{\circ}C$ to $105^{\circ}C$, of gasoline engine on fuel economy and emission characteristics. In this study, a gasoline car equipped with waxthermostat was tested and simulated under FTP-75 and HWFET mode. CRUISE $M^{TM}$ was used to simulate vehicle dynamics, transient engine performance and TMS. The test results showed fuel savings for both drive cycles due to higher STO of $100^{\circ}C$, which is slightly worse than that of $90^{\circ}C$ and amounts between 0.34 and 0.475 %. These controversial results are attributed to experimental errors and uncertainty. The computational results for three STOs, $85^{\circ}C$, $95^{\circ}C$ and $105^{\circ}C$, showed that fuel savings attributed to the application of higher STOs of $95^{\circ}C$ and $105^{\circ}C$ are relatively small and range from 0.306 to 0.363 %. It is also found that the amount of HC and CO emissions from the tailpipe tends to decrease with higher engine coolant temperature because of faster catalyst light-off and improved combustion.
Keywords
Vehicle thermal management system(VTMS); Coolant; Thermostat; Fuel consumption(FC); System level vehicle model;
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Times Cited By KSCI : 1  (Citation Analysis)
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