Abstract
This study analyzed the characteristics and distribution of emissions from diesel vehicles that are sold in Korea and satisfy the Euro-6 standards, according to after-treatment systems. To identify the emission distribution of diesel vehicles according to after-treatment systems, results of the certification tests conducted on 266 vehicle models were examined. Results of the certification tests on 86 vehicle models that were manufactured based on the standards for RDE after 2017 were examined according to the engine displacement and power. The emission characteristics of six vehicle models equipped with different types of after-treatment systems were verified through certification tests in the New European Driving Cycle and Worldwide Harmonized Light Vehicle Test Procedure modes and RDE tests, according to the after-treatment systems. Specifically, a chassis dynamometer and an emission analyzer were used in the certification test modes; a portable emissions measurement system was used in the RDE test. The results indicated that the amount of NOx emissions from diesel vehicles has been constantly decreasing since 2017 due to the implementation of standards for RDE and advancements in after-treatment systems. Furthermore, it was found that selective catalyst reduction systems must be installed in vehicles to satisfy Euro-6 standards for permissible emissions on real-roads.
Highlights
IntroductionThe number of registered hybrid, electric, and hydrogen-powered fuel cell vehicles, which are classified as environmentally friendly vehicles, is increasing
The Ministry of Land, Infrastructure and Transport (MOLIT) has stated that 23.68 million vehicles have been registered in South Korea as of December 2019, and has projected this number to exceed24 million by 2020 [1], which is approximately 2.2 times the number of vehicles in 1999, i.e., 11 million.The number of registered hybrid, electric, and hydrogen-powered fuel cell vehicles, which are classified as environmentally friendly vehicles, is increasing
Euro 6the standards, on based on the power, displacement, and characteristics of emissions according to the year x the power, displacement, and characteristics of NOx emissions according to the year of certification
Summary
The number of registered hybrid, electric, and hydrogen-powered fuel cell vehicles, which are classified as environmentally friendly vehicles, is increasing. This number is insignificant, because it accounts for only 1.7% of all registered vehicles. Energies 2020, 13, 4936 registered as of the end of 2019 was 9,957,543, which was approximately 42% of the total number of registered vehicles. The number of diesel vehicles registered as of 2012 constituted 37%. Of the total number of registered vehicles. These data clearly show that the number of diesel vehicles has been constantly increasing
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