公开(公告)号：US20250129864A1

公开(公告)日：2025-04-24

申请号：US18689918

申请日：2022-03-17

Applicant: KYB Corporation

Inventor： Tatsuo ITO

IPC: F16K31/40 ,  F16K17/02

Abstract: A solenoid relief valve system includes: a solenoid relief valve; and a control unit; wherein the control unit has a dither generating unit configured to generate the dither on a plunger by applying a first dither signal or a second dither signal having different amplitude or frequency from the first dither signal to current to be supplied to a coil, and wherein the dither generating unit is configured to apply the first dither signal to the current to be supplied to the coil during adjustment of a setting pressure, by which the current to be supplied to the coil is caused to be changed, and configured to apply the second dither signal to the current to be supplied to the coil in a state in which the adjustment of the setting pressure is not performed.

公开(公告)号：US20190024678A1

公开(公告)日：2019-01-24

申请号：US16072063

申请日：2016-09-20

Applicant: KYB Corporation

Inventor： Tatsuo ITO

IPC: F15B13/044 ,  F15B11/042 ,  F15B11/044 ,  F15B21/08

Abstract: A control device for a fluid pressure actuator includes a first valve controlling a flow of working oil supplied to or discharged from a hydraulic cylinder, a regulation determining portion determining whether to increase or decrease an energization amount to the first valve on the basis of a position deviation between an actual position and a target position of the hydraulic cylinder, a first proportional gain output portion deciding a command current value to be applied to the first valve on the basis of the position deviation, and an offset current output portion setting an offset current value to be applied to the first valve on the basis of a judgment result of the regulation determining portion. The offset current output portion sets a first current value as the offset current value in a valve closing process, and sets a second current value greater than the first current value as the offset current value in a valve opening process.

公开(公告)号：US20190116718A1

公开(公告)日：2019-04-25

申请号：US16092473

申请日：2017-01-27

Applicant: KYB Corporation

Inventor： Tatsuo ITO ,  Tooru MATSUURA

IPC: A01B63/10 ,  B66B1/34 ,  B66B1/40 ,  F15B13/02 ,  F15B21/08

Abstract: A lifting control device includes: a position acquisition portion configured to acquire an extended or contracted position of the hydraulic cylinder; a target setting portion configured to set a target position of the hydraulic cylinder; a control portion configured to control an energized amount of the solenoid valve; and an input judging portion configured to judge whether the operational input is an opening command to perform an opening control in which the solenoid valve is made to be fully open or is a positional control command to perform a positional control in which the solenoid valve is actuated according to an operation input amount to control the extended or contracted position of the hydraulic cylinder, wherein when the operational input is judged as the opening command by the input judging portion, the opening control is performed due to the non-integral type control by the control portion.

公开(公告)号：US20170164599A1

公开(公告)日：2017-06-15

申请号：US15118109

申请日：2014-10-17

Applicant: KYB Corporation

Inventor： Tatsuo ITO ,  Takanori INADA ,  Takanobu YOSHIDA ,  Tomomichi MIZUKAMI ,  Atsushi OOTA ,  Masaki AKASHI ,  Yasuo TANAKA ,  Hiroki TOKUDA

IPC: A01M7/00 ,  B05B13/00 ,  A01G25/09

CPC classification number: A01M7/0053 ,  A01G25/09 ,  B05B13/005

Abstract: A boom damping device includes a fluid pressure cylinder configured to perform an expansion/contraction operation in conjunction with rotational movement of a boom in a roll direction of a working vehicle, a first pressure accumulator into/out of which an operating fluid flows through a first passage with the expansion/contraction operation of the fluid pressure cylinder, a second pressure accumulator into/out of which the operating fluid flows through a second passage with the expansion/contraction operation of the fluid pressure cylinder, and a shut-off switch configured to shut off the first passage and configured to shut off the second passage if at least either one of a right boom and a left boom is not at a working position expanded in a right-and-left direction of the working vehicle.