Abstract
A fuel cut-off injection strategy can be employed during deceleration to increase fuel efficiency, but NOx is immediately emitted after fuel injection recovery. In this paper, the NOx emissions under various driving cycles are investigated. The NOx mass emissions from gasoline vehicles with a fuel cut-off strategy measured are much higher than those without a cut-off. More comprehensive and aggressive tests were carried out to analyse NOx emissions. The total NOx emissions can be classified as associated with warming up, fuel cut-off and other. The proportion of fuel cut-off-caused NOx mass emissions was the highest (61.2%) in real driving emissions 1 (RDE1) owing to its aggressive driving and frequent pedal switching. In comparison, for Worldwide harmonized Light duty vehicle Test Cycle (WLTC) and Random Test Standardized aggressive (RTS-95), warming-up induced NOx dominates, followed by fuel cut-off and other, while for both RDE cycles, fuel cut-off is the primary factor.
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