28 Feb '16, 12pm

Green Car Congress: ORNL team reviews fuel-injection strategies for low-temperature gasoline compression ignition

Simply speaking, the goal of LTC is to achieve sufficient premixing between the fuel and air in a globally dilute environment, such that combustion takes place at lower temperatures… Providing time for fuel/air mixing avoids high soot formation rates. Dilution, with either air or exhaust gas recirculation (EGR), reduces the peak combustion temperatures to avoid high NOx formation rates. However, if the fuel and air are overly mixed, resulting in equivalence ratios that are too low, the local combustion temperature becomes too low to support complete fuel oxidation. Although LTC can yield high thermal efficiency with simultaneously low NOx and soot emissions, there are challenges associated with combustion efficiency (i.e., unburned hydrocarbon (UHC) and CO emissions), narrow operable load range, high pressure rise rates, and combustion timing controllability, all of which ...

Full article: http://www.greencarcongress.com/2016/01/20160118-ornl.htm...

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