| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel filter clogging detection device in a fuel supply circuit, which can accurately determine a clogging state of a fuel filter even when an altitude or the like changes.SOLUTION: A fuel supply circuit 21 for supplying fuel to an engine 16 comprises a fuel tank 22 for storing the fuel F, a fuel filter 23 for filtering the fuel F supplied from the inside of the fuel tank 22, and a fuel pump 24 for pressurizingly supplying the fuel F passed through the fuel filter 23 to the engine 16. A fuel filter clogging detection device 31, which detects clogging of the fuel filter 23 in the fuel supply circuit 21 and warns, comprises an atmospheric pressure sensor 32 for detecting an atmospheric pressure P1, a filter outlet pressure sensor 33 for detecting an outlet side pressure P2 of the fuel filter 23, and control means 35 which calculates a differential pressure between the atmospheric pressure P1 and the outlet side pressure P2, determines a clogging degree of the fuel filer 23 from the differential pressure and outputs a warning signal when the clogging degree exceeds a threshold. |
