RT Conference Proceedings T1 Analysis and simulation of a Stop/Start system on an urban bus. A1 Auñón-Hidalgo, Juan Antonio A1 Nuñez-Gevorkian, Daniel K1 Autobuses - Contaminación K1 Motores K1 Ingeniería mecánica AB This article delves into the application of the Stop/Start microhybrid system in urban buses and its contribution towards energysavings and reduction in CO2 emissions, utilizing ultracapacitors as the power source. The current situation in the automotiveindustry makes it necessary to look for alternatives to traditional combustion engine applications. The European Union has set strictemission reduction targets under the Euro 6d-TEMP EVAP-ISC regulations. Hybrid and micro-hybrid vehicles, with systems suchas Stop/Start, offer economic and environmental advantages by minimizing the running time of the combustion engine.Through partnership with Koneika, a specialist in ultracapacitor-based energy storage, a computer model was constructed forestimating fuel savings and CO2 emissions. The model, built on state machine theory and utilizing Matlab's Simulink tool, simulatesthe real-time operation and interactions of the bus, offering valuable data on energy savings and greenhouse gas emissions. Studiesdemonstrate that the Stop/Start system could lower CO2 emissions by 8.1% to 4.5% and fuel consumption by 6% under regulartraffic, and up to 11.9% under congested conditions. This reinforces the potential of hybrid or microhybrid technologies, likeStop/Start, in combating increased fuel consumption and emissions in urban environments. YR 2023 FD 2023 LK https://hdl.handle.net/10630/31057 UL https://hdl.handle.net/10630/31057 LA eng NO No hay mención de derechos. DS RIUMA. Repositorio Institucional de la Universidad de Málaga RD 5 mar 2026