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One of the most attractive combustive features for hydrogen fuel is its wide range of flammability. The wide flammability limits allow hydrogen engine to be operated at extremely lean air-fuel ratios compared to conventional fuels. Concepts for part-load operation of hydrogen engines have been proposed using quantitative control and qualitative control. This paper summarizes the steady-state test results by quantitative and qualitative air-fuel ratio control modes in a hydrogen internal combustion four-cylinder engine operated on an engine dynamometer. Based on the test results of engine efficiency and NOx emissions, a combinated air-fuel ratio control strategy for hydrogen engine is proposed.