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

Claim 0:
1. An air filter deterioration determination device of a construction machine comprising:
an intake air pressure measurement device that measures intake negative pressure of a motor mounted as a power source of a construction machine; and
a controller that is communicably connected to the motor and the intake air pressure measurement device, and determines deterioration of an air filter for removing dust in intake air to be supplied to the motor, wherein
the controller includes:
an intake air measurement value calculation unit that determines a degree of clogging of the air filter for filtering the intake air of the motor on the basis of the intake negative pressure measured by the intake air pressure measurement device;
a storage unit that stores a plurality of groups previously set by classifying a minimum value to a maximum value of a cleaning interval, the cleaning interval being an accumulated value of operating time of the motor from previous cleaning of the air filter until the clogging is determined by the intake air measurement value calculation unit;
a cleaning interval frequency calculation unit that measures the cleaning interval each time the clogging is determined by the intake air measurement value calculation unit and the air filter is cleaned, that sequentially adds the measured cleaning interval to a group to which the measured cleaning interval is to belong, among the plurality of groups, and that totalizes frequency of the cleaning interval in each of the groups; and
a deterioration determination processing unit that determines a degree of deterioration of the air filter on the basis of the frequency of the cleaning interval in each of the group, the frequency being totalized by the cleaning interval frequency calculation unit.