MAIN GAS VALVE MALFUNCTION AND DETERIORATION DIAGNOSIS METHOD FOR GAS ENGINE

摘要

PPROBLEM TO BE SOLVED: To enable to predict the malfunction and deterioration of a main gas valve on a daily basis. PSOLUTION: Technology is provided for diagnosing the condition of the main gas valve 11 installed on the midway of a main combustion chamber gas supply pipe 7 which supplies fuel gas to a mixture supply passage 8 communicated with each cylinder chamber of a gas engine. In accordance with an exhaust gas temperature detected by an exhaust gas temperature sensor 10 provided in an exhaust gas exhaust passage 9 in each cylinder of the gas engine and a knocking value detected by a knocking sensor 14 provided in each cylinder of the gas engine, a control device 15 sets an injection offset value for every cylinder. A personal computer 18 in a remote monitoring room 17 is used for calculating the injection offset value for every cylinder, extracted for one day, as an average injection offset value. A variation of the daily average injection offset value is monitored to determine whether the main gas valve 11 is malfunctioned or not. According to this result, the sign of the malfunction of the main gas valve can be determined on a daily basis even at a remote place distant from a site. PCOPYRIGHT: (C)2011,JPO&INPIT