In the case of passenger cars and light commercial vehicles, Euro procedures, which include standards for exhaust pollutants emissions during driving cycles, under controlled conditions, on a chassis dynamometer, and road tests apply in the European Union (European Commission E 2007, 2015, 2017). This also applies to the introduced emission standards and testing procedures for internal combustion engines. For many years, work has been conducted to minimize energy consumption and reduce exhaust pollutants emissions. The harmful effects of transport on the environment are mainly related to the emission of gaseous and particulate pollutants by internal combustion engines. This parameter is rarely presented by the authors of papers on exhaust components emission research. According to the authors’ judgment, it is beneficial to determine the coefficient of variation for a more complete assessment of exhaust emission result repeatability obtained from a small number of measurements. The results of the analysis show that, in the case of a small number of measurements, the results repeatability analysis is necessary for a proper interpretation of the pollutant emission results on the basis of the mean value. The aim of the research is to draw attention to the accuracy of the pollutant emission research results in driving cycles, and the comparison of pollutant emission results and their repeatability obtained in successive NEDC cycles under cold and hot start conditions. The emission of CO, CH 4, CO 2, NO X, THC, and NMHC was subjected to the analysis. The research was conducted in a climate chamber, enabling the temperature conditions to be determined from − 20 to + 30 ☌. This article presents the assessment of repeatability of the passenger car engine exhaust pollutants emission research results obtained in the conditions of a chassis dynamometer. Measurement of car engines exhaust pollutants emissions is very important because of their harmful effects on the environment.
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January 2023
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