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The main objective of the project is to develop the hydrogen-fuelled vehicles for transport application. Exhaustive lab tests on engine & vehicle was done to access the hydrogen (H₂) behavior at varying operating conditions. Fifteen such hydrogen-fuelled vehicles were developed by Mahindra with integration of the optimized engine, fuel storage system, fuelling system and safety features to demonstrate these hydrogen vehicles. These vehicles are refueled at a dedicated hydrogen-refueling facility. Detailed calibration was done with hydrogen for meeting the performance and emissions characteristics of the engine. In this experimental investigation Electronic Control Unit (ECU)-based timed manifold injection system was developed. Hydrogen is injected before the intake manifold and the quantity of hydrogen injection is depending on the load, speed and operating conditions.