Comparison of pollutant concentrations and engine operating parameters during cold start with petrol and LPG
Cold start of an internal combustion engine generates conditions conducive to intensive pollutant emission and reduced thermal efficiency. This study conducted a comparative analysis of the concentrations of selected exhaust components and engine operating parameters during the cold start phase of a dual-fuel vehicle powered by petrol and LPG. Using a repeatable homologation test, the tests were performed on a chassis dynamometer in identical ambient and load conditions. The analysis included HC, CH₄, CO₂ and NOx concentrations, recorded simultaneously with the internal combustion engine operating parameters: rotational speed, coolant temperature, throttle position and load. The collected data enabled the development of mathematical models representing the relationships between the dynamics of the start process and pollutant concentrations. The results indicate significant differences in the start-up characteristics for individual fuels - in particular, LPG showed a different emission profile in the early phase of engine operation. Conclusions from the conducted analyses can constitute the basis for designing start-up control strategies in dual-fuel vehicles, considering environmental requirements and further development of emission control systems.
Topic: Exhaust emissions and aftertreatment
Author: Piotr Wiśniowski
Co-authors: Edward Kozłowski, Magdalena Zimakowska-Laskowska, Ksawery Żbik, Marcin Ślęzak, Stanisław Taubert
