AIR-FUEL RATIO CONTROL DEVICE OF GAS ENGINE, AND SHIP EQUIPPED WITH GAS ENGINE WITH AIR-FUEL RATIO CONTROL DEVICE

摘要

To provide an air-fuel ratio control device of a gas engine and a ship, which can keep an air-fuel ratio constant even when the setting of a supply amount of a fuel gas is changed in such a case where a load fluctuates, without adding many devices for controlling the air-fuel ratio, and which are superior in responsiveness.SOLUTION: An air-fuel ratio control device of a gas engine comprises: a fuel supply amount control means 30 for controlling a supply amount of a fuel gas to be supplied to a gas engine 10; a supercharger 20 having a compressor 22 and a turbine 21; a supercharger rotation speed detection means 31; an air-fuel ratio control means 32 for performing control so that a time variation of the supply amount of the fuel gas by the fuel supply amount control means 30 is delayed on the basis of a detection result of the supercharger rotation speed detection means 31 when the setting of the supply amount of the fuel gas is changed: and a variable pitch propeller 3 driven by the gas engine 10. The air-fuel ratio control means 32 controls the variable pitch propeller 3 on the basis of the detection result of the supercharger rotation speed detection means 31 when the setting of the supply amount of the fuel gas is changed.SELECTED DRAWING: Figure 2