Abstract
Changes in the new emission driving cycle for Euro III / Euro IV regulations and analysis of the influence of cold start phases on emission from spark-ignition engines in three emission cycles
(NEDC, ECE, FTP 75) are presented in the paper.
The paper shows the results of emission tests for such gaseous pollutants as CO, HC and NOX, achieved during tests performed on a chassis dynamometer according to present and new ECE procedures (with removal of 40 seconds idle phase) and versus FTP 75 one, using the bag analysis method and measuring level of CO, HC, NOX in individual phases of these tests. The tests were undertaken on several vehicle types (equipped with MPI and GDI feeding systems), which where of European and Japanese manufacture. The objective of the research was to determine the increase in emissions of CO, HC and NOX in exhaust gases, and in fuel consumption in the initial phases of engine operation. Methods of reduction in this harmful emissions and results in test for new technologies reducing emissions of CO and HC during cold start were also discussed.