Contribution of Cold and Hot Start Transients in Engine-out HC Emissions

Paper #:
  • 982645

Published:
  • 1998-10-19
Citation:
Luan, Y. and Henein, N., "Contribution of Cold and Hot Start Transients in Engine-out HC Emissions," SAE Technical Paper 982645, 1998, https://doi.org/10.4271/982645.
Pages:
17
Abstract:
Engine-out HC emissions were investigated during cold and hot starts. The tests were conducted at room temperature, on a new Chrysler 2.4-L, 4-cylinder, 16-valve, DOHC, multipoint-port-fuel-injection gasoline engine. Real time engine-out HC emissions were measured using Cambustion Fast Response Flame Ionization Detector (FRFID). Sources of unburned hydrocarbon emissions were discussed in details. Unburned hydrocarbons emitted during the cold-start were much higher than the hot-start. Cylinder-to-cylinder variation was investigated. A fuel inventory program was used to characterize total injected fuel, burned fuel, unburned HC, and fuel unaccounted for (mainly accumulated fuel in the engine system and CO). A fuel interrupt test was run to examine the possibility of burning the leftover fuel after the fuel shut-off. The contribution of the cold and hot start modes in engine-out HC emissions was determined.
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