1161 Figure 1 – Conceptual diagram of the embedded hydrogen generation and injection system. Case Study and Data Collection: Field testing was performed on a road truck operating in an iron ore mine in the Quadrilátero Ferrífero region (Brazil). The route included representative mine conditions with variations in fuel consumption. Two operating conditions were compared: • Baseline (diesel‑only) operation; • Test condition (diesel + H₂) on the same truck under comparable route/load conditions. • Operational data were acquired using a system composed of a high-precision flowmeter and auxiliary sensors, and subsequently integrated into a telemetry platform based on the CAN J1939 protocol. This architecture enabled real-time monitoring and dynamic analysis of the prototype’s energy performance under actual mining operating conditions. • The monitored parameters included diesel consumption (L/h), average vehicle speed (km/h), and hydrogen flow rate (L/min). • Diesel fuel consumption was quantified using a high-precision flowmeter (model DFM 250), which operates based on the differential flow measurement principle. The device employs two independent chambers to simultaneously measure the flow rates in the fuel supply and return lines, allowing direct determination of the engine’s effective fuel consumption. This configuration provides high metrological accuracy, with a measurement error below 0.5%, ensuring the reliability of the experimental data. • The adopted methodological approach ensures measurement consistency and traceability, providing a robust basis for comparing the performance of the baseline vehicle and the truck equipped with a hydrogen supplementation system. Comparison and Analysis: Equivalent operational windows were defined for both the reference condition and the hydrogenassisted condition. The analysis included the calculation of key performance indicators, namely specific fuel consumption, average speed, and operational productivity. The experimental design was conducted in two equivalent operational phases. In Phase I (baseline), a Scania G500 truck operated under conventional conditions to establish the benchmark for real fuel consumption. In Phase II (test phase), the same model was equipped with a hydrogen addition system. To ensure internal validity, external variables were kept constant, including route length (18 km), payload (25
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