US 12,404,655 B2
Hydraulic-pump flow-rate calibration system
Hideyasu Muraoka, Kobe (JP); Nobuyuki Kinoshita, Kobe (JP); Tomomichi Nose, Kobe (JP); Yoshihiko Hata, Kobe (JP); and Takashi Okashiro, Kobe (JP)
Assigned to KAWASAKI JUKOGYO KABUSHIKI KAISHA, Kobe (JP)
Appl. No. 17/428,017
Filed by KAWASAKI JUKOGYO KABUSHIKI KAISHA, Kobe (JP)
PCT Filed Jan. 31, 2020, PCT No. PCT/JP2020/003827
§ 371(c)(1), (2) Date Aug. 3, 2021,
PCT Pub. No. WO2020/162377, PCT Pub. Date Aug. 13, 2020.
Claims priority of application No. 2019-021573 (JP), filed on Feb. 8, 2019.
Prior Publication US 2022/0106770 A1, Apr. 7, 2022
Int. Cl. E02F 9/22 (2006.01); F04B 1/26 (2006.01); F04B 49/06 (2006.01); F15B 11/02 (2006.01)
CPC E02F 9/22 (2013.01) [F04B 1/26 (2013.01); F04B 49/065 (2013.01); F15B 11/02 (2013.01); F04B 2205/09 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A hydraulic-pump flow-rate calibration system, comprising:
a hydraulic pump of a variable capacitance type that is connected to a hydraulic actuator and supplies an operating fluid to the hydraulic actuator, the hydraulic actuator operating at a speed corresponding to a flow rate of the operating fluid supplied to the hydraulic actuator;
a regulator that changes a dispense flow rate of the hydraulic pump according to a flow rate command signal input to the regulator;
a flow rate detection device that detects a flow rate of the operating fluid to be supplied to the hydraulic actuator;
a control device that outputs, to the regulator, the flow rate command signal calculated based on a reference characteristic, to control the regulator; and
a calibration device that calculates an actual measurement characteristic indicating the dispense flow rate for the flow rate command signal, and performs, on the reference characteristic, calibration based on the actual measurement characteristic, wherein
the actual measurement characteristic is calculated based on the flow rate detected, as a result of the flow rate of the operating fluid to be supplied to the hydraulic actuator being detected by the flow rate detection device during output of a predetermined flow rate command signal from the control device to the regulator, and
the control device outputs, to the regulator, the flow rate command signal calculated based on the reference characteristic calibrated based on the actual measurement characteristic, to control the dispense flow rate of the hydraulic pump.