Crankcase dilution system and test system of hydrogen internal combustion engine

The embodiment of the invention provides a crankcase dilution system and a test system of a hydrogen internal combustion engine, and relates to the technical field of hydrogen internal combustion engine testing. The crankcase dilution system of the hydrogen internal combustion engine comprises a gas supply control device, an oil-gas separation device, a hydrogen concentration sensor and a gas leakage measuring device. The air supply control device is used for supplying air into the crankcase and measuring the flow of the supplied air; the oil-gas separation device is used for carrying out oil-gas separation on mixed gas discharged by the crankcase and discharging the separated gas through the gas leakage measuring device; the hydrogen concentration sensor is used for measuring the hydrogen concentration in the gas output by the oil-gas separation device; and the gas leakage measuring device is used for measuring the flow of the gas output by the oil-gas separation device. In the testing process of the hydroge