Low-temperature cold-start gaseous emissions of late technology passenger cars

Christos Dardiotis, Giorgio Martini, Alessandro Marotta and Urbano Manfredi

Applied Energy, 2013, vol. 111, issue C, 468-478

Abstract: The control of exhaust emissions from modern vehicles is primarily based on the use of after-treatment devices, typically consisting in different types of catalysts. The efficiency of catalytic systems however strictly depends on their temperature, achieving certain effectiveness in reducing emissions only above the light-off temperature. Moreover, the enrichment of the air/fuel mixture during cold-start engine operation, in order to compensate for the reduced fuel vaporization and elevated engine components friction, leads to incomplete fuel combustion. These two factors generally contribute to elevated emissions during cold-start operation, especially under low ambient temperatures. We investigated the gaseous emission performance of thirteen late technology vehicles over the New European Driving Cycle (NEDC), at 22°C and −7°C test cell temperatures. The test fleet included gasoline vehicles both Port Fuel Injection (PFI) and Gasoline Direct Injection (G-DI) as well as diesel vehicles, amongst which a fully Euro 6 compliant vehicle equipped with a Selective Catalytic Reduction (SCR) system.

Keywords: Cold-start; Gaseous emissions; Low temperature test; Passenger cars; Emission limits (search for similar items in EconPapers)
Date: 2013
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Citations: View citations in EconPapers (20)

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DOI: 10.1016/j.apenergy.2013.04.093

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