A generalized component efficiency and input-data generation model for creating fleet-representative vehicle simulation cases in VECTO 2019-01-1280
Heavy-duty vehicles (HDV) account for 4% of the European vehicle fleet, but they are responsible for the 30% of the European Union’s road CO2 emissions. The Vehicle Energy Consumption calculation Tool (VECTO) is used for the official calculation and monitoring of CO2 emissions of HDVs in Europe. The tool uses certified input data in the form of energy or torque loss maps of driveline components and engine fuel consumption maps. However, such data are confidential and are not disclosed. For this reason, any further analysis of the fleet performance and CO2 emissions evolution using VECTO would require "generic" inputs or reconstructing realistic component input data. The current study attempts to address this issue. The study aimed to develop a process that would create VECTO input files based as much as possible on publicly available data. The core of the process is a series of models that calculate the vehicle component efficiency, e.g. gearbox and axle efficiency maps and produce the necessary VECTO input data. The target groups were the regulated HDV Classes, and within this context, the process was applied to generate vehicle cases for rigid trucks and tractor-trailers. Subsequently, in order to evaluate the accuracy of the process, the simulation results were compared with validated VECTO results supplied by various vehicle manufacturers. Taking a step further, the study also investigated whether the simulation results were representative of real-world conditions by comparing them with available data from on-road measurements.