Abstract
Objectives: The Exhaust Gas Recirculation (EGR) system is one solution for reducing vehicle Nitrogen oxide (NO(subscript x)) emissions; however, there is no research on the effectiveness of the EGR system, particularly with regard to gasoline-engine vehicles. This study aimed to fill in this gap. Methods: This study utilized a gasoline-engine test car equipped with the EGR system and an on-board emission measurement device which recorded second-by-second NO(subscript x) emission rates during road tests conducted on freeways and urban arterials. Comparable data was recorded from chassis tests performed in the laboratory. Results: NO(subscript x) emission rates measured from the test car, in all conditions, were less than 1 g/km. This was significantly lower than the parameters set by the EPA model, MOBILE-Taiwan. Moreover, the measured NO(subscript x) emission rates decreased while vehicular speeds increased over 70 km/hr. This was in contrast with the increasing trend of the parameters from the EPA Model. Conclusions: The results of this study showed that the NO(subscript x) emission rates of the EGR-equipped vehicle were not well represented by the model parameters. In light of the evidence, this study calls attention to the need for investigation of NO(subscript x) emission rates of EGR-equipped vehicles in order to better estimate vehicle NO(subscript x) emission as the popularity of EGR-equipped vehicles in the new car fleet is significant.
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