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The dual fuel CNG-diesel engine is a means of utilizing gaseous fuel resources efficiently in appropriately converted diesel engines.In some published research on the use gaseous fuel in Diesel engine show the relation between compression ratio, combustion noise, knock and self-ignition limit [1].Knocking combustion is exciting the vibration of engines part which decrease thermal efficiency and damage the engine.The method to control the non-knocking combustion is the interested problem.