Abstract
The aim of this article was to analyse the correlation of emission intensity of carbon monoxide, hydrocarbons, nitrogen oxides, and carbon dioxide in various conditions of operation of the automotive internal combustion engine. The operational properties of the engine were investigated on chassis dynamometer in driving test cycles simulating various real-world conditions of the vehicle drive: street congestions, urban traffic without congestions, extra-urban traffic, and high-speed traffic. The correlational dependence of the pollutant emission intensity on the non-negative effective power of the engine and the correlational interdependence between the emission intensity of individual pollutants were investigated. The coefficients of Pearson’s linear correlation, Spearman’s rank correlation, Kruskal’s gamma correlation, and Kendall’s tau correlation were calculated. It was found that the emission intensity of pollutants in the driving test cycles strongly depends on the dynamic states of operation of the engine. The time histories of the emission intensity of pollutants were strongly correlated with the non-negative effective power of the engine. There were only a few cases where this correlation can be assessed as weak. The time histories of the emission intensity of individual pollutants were also strongly correlated with each other, with only a few exemptions.
Highlights
The Internal Combustion (IC) engines of motor vehicles operate predominantly in dynamic states (Chłopek 1999).the works aimed at improving the operational properties of IC engines must include the testing of the engines in dynamic states corresponding to the conditions of typical engine operation in a moving vehicle.The conditions corresponding to the operation of IC engines in moving vehicles are characterized by the process frequency range of the order of 0.1...10 Hz
The lowest and the highest values of the coefficients of correlation were obtained for the CT test and HT test, respectively
A definite majority of the sets of emission intensity of individual pollutants were strongly correlated with each other, to such an extent that the probability that the hypothesis of absence of a correlation would not be rejected was at a level of below 0.01
Summary
The Internal Combustion (IC) engines of motor vehicles operate predominantly in dynamic states (Chłopek 1999).the works aimed at improving the operational properties of IC engines must include the testing of the engines in dynamic states corresponding to the conditions of typical engine operation in a moving vehicle.The conditions corresponding to the operation of IC engines in moving vehicles are characterized by the process frequency range of the order of 0.1...10 Hz. The Internal Combustion (IC) engines of motor vehicles operate predominantly in dynamic states (Chłopek 1999). The works aimed at improving the operational properties of IC engines must include the testing of the engines in dynamic states corresponding to the conditions of typical engine operation in a moving vehicle. The conditions corresponding to the operation of IC engines in moving vehicles are characterized by the process frequency range of the order of 0.1...10. Hz. The main process, which determines the state of operation of an automotive engine, is the vehicle speed Automotive engines are often tested in motor vehicles subjected to vehicle driving test cycles on chassis dynamometers. In the case of engines of heavy motor vehicles, engine test benches are used ( due to limited availability of adequate test equipment), where the conditions of engine operation in a moving vehicle are simulated
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