Hydraulic system

A hydraulic system comprising:

• a hydraulic device including a casing, a cylinder block including a cylinder block body rotatably supported on the casing and in which a plurality of cylinder chambers are formed around a rotating shaft and N−1 first detected portions formed on an outer peripheral surface of the cylinder block body, a piston that is housed in each of the plurality of cylinder chambers of the cylinder block in a manner that allows reciprocation of the piston, a linkage mechanism that reciprocates the piston in conjunction with rotation of the cylinder block, and a sensor that is provided at a position corresponding to each of the plurality of first detected portions and when each of the plurality of first detected portions passes by during the rotation of the cylinder block, outputs a first signal;
• and
• a hardware controller, including a processor, that determines, on the basis of an output result that is output from the sensor, whether or not the cylinder block is a suitable product, wherein
• the plurality of first detected portions are disposed at N−1 positions that are among positions determined by equally dividing the outer peripheral surface of the cylinder block body by N, and
• the hardware controller determines whether or not the cylinder block is a suitable product, on the basis of a first frequency component attributed to the first signal and a frequency component different from the first frequency component and attributed to an absence of the plurality of first detected portions at remaining positions.

A hydraulic system comprising:

• a hydraulic device including a casing, a cylinder block including a cylinder block body rotatably supported on the casing and in which a plurality of cylinder chambers are formed around a rotating shaft and N−1 first detected portions formed on an outer peripheral surface of the cylinder block body, a piston that is housed in each of the plurality of cylinder chambers of the cylinder block in a manner that allows reciprocation of the piston, a linkage mechanism that reciprocates the piston in conjunction with rotation of the cylinder block, and a sensor that is provided at a position corresponding to each of the plurality of first detected portions and when each of the plurality of first detected portions passes by during the rotation of the cylinder block, outputs a first signal;
• and
• a hardware controller, including a processor, that determines, on the basis of an output result that is output from the sensor, whether or not the cylinder block is a suitable product, wherein
• the plurality of first detected portions are disposed at N−1 positions that are among positions determined by equally dividing the outer peripheral surface of the cylinder block body by N,
• the cylinder block further includes a second detected portion formed on the outer peripheral surface of the cylinder block body,
• the second detected portion is disposed at a position offset from a remaining position, and
• the hardware controller determines whether or not the cylinder block is a suitable product, using, as a reference signal, the first signal that is output at a time interval corresponding to a first distance, and using, as a signal for identification, a second signal that is output at a time interval corresponding to a second distance.

A hydraulic system comprising:

• a hydraulic device including a casing, a cylinder block including a cylinder block body rotatably supported on the casing and in which a plurality of cylinder chambers are formed around a rotating shaft, N−2 first detected portions formed on an outer peripheral surface of the cylinder block body, and a second detected portion formed on the outer peripheral surface of the cylinder block body, a piston that is housed in each of the plurality of cylinder chambers of the cylinder block in a manner that allows reciprocation of the piston, a linkage mechanism that reciprocates the piston in conjunction with rotation of the cylinder block, and a sensor that is provided at a position corresponding to each of the N−2 first detected portions and the second detected portion and when each of the N−2 first detected portions and the second detected portion passes by during the rotation of the cylinder block, outputs a corresponding one of a first signal and a second signal;
• and
• a hardware controller, including a processor, that determines, on the basis of an output result that is output from the sensor, whether or not the cylinder block is a suitable product, wherein
• the N−2 first detected portions are disposed at N−2 positions that are among positions determined by equally dividing the outer peripheral surface of the cylinder block body by N,
• the second detected portion is one second detected portion disposed at a position offset from two remaining positions among the positions determined by equally dividing the outer peripheral surface of the cylinder block body by N, and
• the hardware controller determines whether or not the cylinder block is a suitable product, using, as a reference signal, the first signal that is output at a time interval corresponding to a first distance, and using, as a signal for identification, the second signal that is output at a time interval corresponding to a second distance.