Development of an analytical model of automobile energy consumption during use-phase for parametrized life cycle assessment

Models for automobile energy consumption calculations often lack adaptability, granularity, and consistency, limiting the transparency, reproducibility, and representativeness of automobile processes in Life Cycle Assessment (LCA). Although developing parametrized models appears to be promising, their application to automobile energy consumption is constrained by the complexity of powertrain modeling and the integration of driving conditions. This work presents a model for gasoline and electric vehicles based on parametrized equations, describing physical drivers of energy demand while uncoupling the role of contributors, including the vehicle body, powertrain, path, and driver. An innovative method for parametrizing driving conditions is introduced, eliminating reliance on traditional driving cycles. Complemented by pre-set configurations to enhance usability, the computational tool PETRAUL built on this framework enables practitioners to perform precise and representative energy consumption calculations for vehicles. This study further demonstrates the tool's utility for both foreground and background LCA processes. This includes scenario analyses emphasizing the necessity of multi-solution strategies, a comparison with ecoinvent and Carculator highlighting improved granularity, and an LCA case study on lightweighting, illustrating enhanced representativeness for assessments across diverse technological and regional conditions. This streamlined LCA of a polycarbonate glazing highlights the potential burden shifting from the vehicle use phase to the manufacturing of lightweight materials, notably when coupled with electrification. Ultimately, PETRAUL provides a robust foundation for advancing LCA practices by enhancing adaptability and transparency in parametrized modeling, while illustrating the need for both technological and sobriety measures to reduce environmental impacts of the automobile industry.

Mots clés

• Life cycle assessment
• Automobile energy consumption
• Parametrization
• Lightweighting