Air-fuel ratio control device for gas engine and ship equipped with gas engine with air-fuel ratio control device

摘要

PROBLEM TO BE SOLVED: To provide an air-fuel ratio control device of a gas engine and a ship equipped with the gas engine including the air-fuel ratio control device, superior in responsiveness by keeping a constant air-fuel ratio even when the setting of a supply amount of a fuel gas is changed in the case where a load fluctuates, without additionally installing much apparatuses for controlling the air-fuel ratio.SOLUTION: An air-fuel ratio control device of a gas engine includes 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 for pressurizing air and a turbine 21 driven by an exhaust gas of the gas engine 10, supercharger rotational frequency detection means 31 detecting a rotational frequency of the supercharger 20, and air-fuel ratio control means 32 for performing control so that temporal variation of the supply amount of the fuel gas by the fuel supply amount control means 30 is delayed on the basis of a result of the detection by the supercharger rotational frequency detection means 31 when the setting of the supply amount of the fuel gas is changed.SELECTED DRAWING: Figure 2