Hydrogen fuel is the cleanest fuel available and it can be used as an additive in diesel engines. Diesel engines have a variety of advantages such as its power, high thermal efficiency and low fuel costs. There have been extensive studies on the use of hydrogen fuel in diesel engines in recent years. However, the effect of concurrently using gaseous hydrogen fuel and changing injection strategy needs further investigation, especially for the Cummins ISM370 engine. This work considers almost all

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... the functional and emission parameters simultaneously. This procedure can effectively achieve balanced conditions when 6% H 2 (by volume) is injected into the Cummins ISM 370 diesel engine (under different engine speeds). In addition, due to a change in the fuel compound used in the engine, the injection timing and temperature of the engine should be redesigned for better operating. A computational fluid dynamics code is used for simulating the engine. In order to verify the validity of the simulation, the predicted mean pressure and the rate of heat release are compared to the experimental data, and the results are in accordance. The results show that most of the exhaust emissions such as NO, CO, etc. are dramatically reduced by using gaseous hydrogen under various engine speeds. With the addition of 6% H 2 to the engine, the thermal efficiency increases by around 39%, and the NO, soot, CO and CO 2 emissions are reduced by 5%, 75%, 70%, and 30%, respectively, under a 1600 rpm speed. Also, 4 deg BTDC under 2000 rpm is the best injection timing that makes a balance between the exhaust emissions and performance parameters. Moreover, the best injection temperature is 330 K among the three injection temperatures considered in this investigation