Patent ID: 11933025
Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Field: Measurement (Instruments)
Classification: CPC E  F  G  B | IPC E  F  G

Claim 3:
4. The air filter deterioration determination device of the construction machine according to claim 1, further comprising: an air filter cleaning instruction unit that instructs cleaning of the filter; and an air filter replacement instruction unit that instructs replacement of the filter, wherein the intake air measurement value calculation unit causes the air filter cleaning instruction unit to instruct the cleaning of the air filter, when the clogging of the air filter is determined, the cleaning interval frequency calculation unit causes the air filter replacement instruction unit to instruct the replacement of the air filter, when the intake negative pressure of the motor is not recovered even though the air filter is cleaned on the basis of the instruction by the air filter cleaning instruction unit.