公开(公告)号：US11466707B2

公开(公告)日：2022-10-11

申请号：US16967615

申请日：2019-04-23

Applicant: KYB Corporation

Inventor： Yusuke Takahashi ,  Takahiro Iwamoto ,  Keitaro Yoshida ,  Takayoshi Kikuchi

IPC: F15B20/00 ,  F15B15/14 ,  G01M3/26

Abstract: A fluid leakage detection system has a detection space to which working oil leaked out through a rod seal is guided; the rod seal being configured to seal an annular gap between a piston rod and a cylinder head; a sensor unit configured to detect pressure in the detection space; and a controller configured to acquire detected result from the sensor unit, wherein the controller has: a calculation unit configured to calculate a pressure parameter representing a pressure fluctuation in the detection space; a determination unit configured to determine occurrence of leakage of the working oil based on the pressure parameter; and the pressure parameter includes an upper limit value and a lower limit value of the pressure fluctuation obtained from the detected result detected by the sensor unit within a predetermined detection period.

公开(公告)号：US11339810B2

公开(公告)日：2022-05-24

申请号：US16759289

申请日：2019-08-05

Applicant: KYB Corporation

Inventor： Takayoshi Kikuchi ,  Keitaro Yoshida ,  Takahiro Iwamoto

IPC: F15B15/14 ,  F15B20/00 ,  G01R31/3835 ,  G01R31/374 ,  G01M3/26

Abstract: A fluid leakage detection system includes: a measurement unit configured to detect leakage of working oil in a hydraulic cylinder; and a controller configured to acquire a measurement result from the measurement unit, wherein the controller diagnoses that a battery depletion has been caused in a battery in a case in which it is determined that a data from the measurement unit has not been acquired and it is determined that the battery of the measurement unit has been in a low-remaining-battery-level state, and the controller diagnoses that a communication abnormality has been caused in a first communication part of the measurement unit in a case in which it is determined that the data from the measurement unit has not been acquired and it is determined that the battery has not been in the low-remaining-battery-level state.

公开(公告)号：US11385194B2

公开(公告)日：2022-07-12

申请号：US16493761

申请日：2018-03-01

Applicant: KYB Corporation

Inventor： Keitaro Yoshida

IPC: G01N27/06 ,  G01N33/28 ,  G01R27/22

Abstract: A fluid property detecting device includes a detection portion configured to detect electric characteristics of a detection target fluid, a calculation portion configured to calculate a property value of the detection target fluid, and a storage portion configured to store the property value calculated by the calculation portion. The storage portion stores, in advance, as the reference detection value, the detection value of the electric characteristic of a reference fluid detected by the detection portion, and the calculation portion calculates the property value of the detection target fluid on the basis of a value obtained by subtracting the reference detection value from a detection value of the detection target fluid.