Abstract

ROSERO, Fredy; ROSERO, Xavier  and  MERA, Zamir. Developing Fuel Efficiency and CO2 Emission Maps of a Vehicle Engine Based on the On-Board Diagnostic (OBD) Approach. Enfoque UTE [online]. 2024, vol.15, n.1, pp.7-15. ISSN 1390-6542.  https://doi.org/10.29019/enfoqueute.1002.

In real traffic conditions vehicle interacts with the road, other vehicles, and traffic control devices. The level of traffic influences driving patterns and, consequently, this can affect the vehicle’s fuel efficiency and emissions. This study aims to develop engine maps of fuel consumption and carbon dioxide (CO2) emissions for a light vehicle operating under real traffic conditions. A representative passenger vehicle powered by gasoline of the ecuadorian vehicle fleet was selected for the experimental campaign that was developed on a test route designed according to real driving emission (RDE) regulation. An on-board diagnostic (OBD) device was used for recording in real-time engine and vehicle operating parameters. Moreover, CO2emissions were estimated using the fuel rate registered from the OBD system of the vehicle This study proposed a novel methodology for developing two-dimensional contour engine maps based on OBD data. The result showed that the vehicle engine operated in real traffic conditions with a brake thermal efficiency (BTE) of 27 %, a brake-specific fuel consumption (BSFC) of 275 g/kWh, and a CO2energy-emission factor of 716 g/kWh. In terms of distance, the CO2emission factor for the tested vehicle was approximately 190 g/km. Overall, this study demonstrates that the OBD approach is a potential method to be used to assess the fuel consumption and CO2emissions of a vehicle operating under real-world traffic conditions, especially in Latin American countries, where portable emission measurement systems (PEMS) are not readily available.

Keywords : Fuel Consumption; CO2 Emissions; Engine Maps; On-Board Diagnostic (OBD).