FILTER CLOGGING WARNING METHOD AND FILTER CLOGGING ELIMINATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a filter clogging elimination method eliminating the clogging of a black exhaust removal filter regenerative by engine exhaust gas temperature.;SOLUTION: Engine exhaust pressure is detected at the inlet port of the black exhaust removal filter 37 removing black exhaust in the exhaust gas from an engine 31, which drives a main pump 32. If a state in which the engine exhaust pressure has reached a prescribed pressure continues for a prescribed time, pump pressure is lowered and a warning is outputted to an annunciator 49. When the pump pressure is lowered, the pump output is returned to an original pump output state for a given time by returning operation. During the given time, the engine 31 is operated at a high load. If the engine exhaust pressure becomes lower than the prescribed value within the given time by the high load operation of the engine for the given time, the pump output is left returned, and if the engine exhaust pressure does not become lower than the prescribed value within the given time, the pump output is lowered and warning is outputted to the annunciator 49.;COPYRIGHT: (C)2006,JPO&NCIPI