GAS FUEL SUPPLY SYSTEM AND ABNORMALITY DETECTION METHOD FOR THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a gas fuel supply system capable of detecting abnormality.SOLUTION: A gas fuel supply system which supplies gas fuel to a combustion chamber of an engine comprises: an injection valve which injects the gas fuel to the combustion chamber; a supply passage where the gas fuel to be supplied to the injection valve flows; a gate valve which can open and close the supply passage; a pressure sensor which detects pressure in the supply passage between the injection valve and the gate valve; and a control device which controls the injection valve and the gate valve. The gas fuel supply system detects abnormality of at least either the injection valve or the gate valve on the basis of detection results of the pressure sensor and a detection device which detects a crank angle of a crank shaft of the engine.