Electromagnetic valve identification device and control unit including same

Abstract

An electromagnetic valve identification device configured to realize individual identification of an electromagnetic valve while suppressing an increase in manufacturing cost. The electromagnetic valve identification device is mounted on an industrial machine, such as a construction machine or an industrial vehicle, configured to move a hydraulic actuator to perform work. The electromagnetic valve identification device includes: an inductance measuring circuit configured to supply an alternating current to a solenoid of an electromagnetic valve of a hydraulic device, the hydraulic device being configured to supply pressure oil to the hydraulic actuator to operate the hydraulic actuator; a calculating portion configured to calculate an inductance of the solenoid based on the alternating current supplied to the solenoid by the inductance measuring circuit; and a storage portion configured to store the calculated inductance of the solenoid as individual identification information of the electromagnetic valve.

1 . An electromagnetic valve identification device mounted on an industrial machine, such as a construction machine or an industrial vehicle, configured to move a hydraulic actuator to perform work,
 the electromagnetic valve identification device comprising:   an inductance measuring circuit configured to supply an alternating current to a solenoid of an electromagnetic valve of a hydraulic device, the hydraulic device being configured to supply pressure oil to the hydraulic actuator to operate the hydraulic actuator;   a calculating portion configured to calculate an inductance of the solenoid based on the alternating current supplied to the solenoid by the inductance measuring circuit; and   a storage portion configured to store the calculated inductance of the solenoid as individual identification information of the electromagnetic valve.   
     
     
         2 . The electromagnetic valve identification device according to  claim 1 , further comprising a replacement determining portion configured to determine whether or not the electromagnetic valve has been replaced, based on a determination criterion in which whether or not the electromagnetic valve has been replaced is determined by using the inductance calculated by the calculating portion. 
     
     
         3 . The electromagnetic valve identification device according to  claim 2 , wherein:
 the determination criterion includes whether or not a reference inductance of the solenoid and an actually measured inductance of the solenoid are different from each other, the reference inductance being calculated by the calculating portion and stored in the storage portion in advance, the actually measured inductance being calculated by the calculating portion; and   when the actually measured inductance is different from the reference inductance, the replacement determining portion determines that the electromagnetic valve has been replaced.   
     
     
         4 . The electromagnetic valve identification device according to  claim 3 , wherein:
 when a predetermined reference value setting condition is satisfied, the calculating portion calculates the reference inductance of the solenoid; and   the storage portion stores the reference inductance calculated by the calculating portion.   
     
     
         5 . The electromagnetic valve identification device according to  claim 2 , wherein:
 the determination criterion includes whether or not the actually measured inductance calculated by the calculating portion falls within a predetermined allowable range; and   when the actually measured inductance falls outside the allowable range, the replacement determining portion determines that the electromagnetic valve has been replaced.   
     
     
         6 . The electromagnetic valve identification device according to  claim 2 , further comprising a resistance measuring portion configured to supply a direct current to the solenoid and measure a resistance value of the solenoid, wherein:
 the determination criterion includes whether or not a reference resistance value of the solenoid and an actually measured resistance value of the solenoid are different from each other, the reference resistance value being measured by the resistance measuring portion in advance, the actually measured resistance value being measured by the resistance measuring portion; and   the replacement determining portion compares the actually measured resistance value with the reference resistance value and determines whether or not the electromagnetic valve has been replaced.   
     
     
         7 . An electromagnetic valve identification device mounted on an industrial machine, such as a construction machine or an industrial vehicle, configured to move a hydraulic actuator to perform work,
 the electromagnetic valve identification device comprising:   a resistance measuring portion configured to supply a direct current to a solenoid of an electromagnetic valve of a hydraulic device and measure a resistance value of the solenoid, the hydraulic device being configured to supply pressure oil to the hydraulic actuator to operate the hydraulic actuator; and   a replacement determining portion configured to determine whether or not the electromagnetic valve has been replaced, based on a determination criterion in which whether or not the electromagnetic valve has been replaced is determined by using the resistance value measured by the resistance measuring portion.   
     
     
         8 . The electromagnetic valve identification device according to  claim 7 , wherein the determination criterion includes whether or not a reference resistance value of the solenoid and an actually measured resistance value of the solenoid are different from each other, the reference resistance value being measured by the resistance measuring portion in advance, the actually measured resistance value being measured by the resistance measuring portion. 
     
     
         9 . A control unit comprising:
 the electromagnetic valve identification device according to  claim 2 ; and   a control device mounted on the industrial vehicle and configured to supply a current to the solenoid of the electromagnetic valve to control an operation of the electromagnetic valve, wherein   the control device is configured to restrict the operation of the electromagnetic valve when the replacement determining portion determines that the electromagnetic valve has been replaced.