STROKE OPERATION DIAGNOSIS SUPPORTING DEVICE FOR HYDRAULIC CYLINDER

• US 20150267382A1
• Filed: 04/12/2013
• Published: 09/24/2015
• Est. Priority Date: 04/12/2013
• Status: Active Grant

• Current Assignee: Komatsu Ltd.
• Original Assignee: Komatsu Ltd.
• Inventors: Ikegami, Katsuhiro, Kami, Yoshiki, Shimano, Yuki, Matsumoto, Hayato
• Granted Patent: US 9,447,563 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: E02F 3/435 for dipper-arms, backhoes or the like
• CPC Class Codes: E02F 9/22 Hydraulic or pneumatic drives for dipper or bucket arm position control E02F3/43, for blade position control for graders E02F3/844; for turntables E02F9/121; for fork-lift trucks B66F9/22
• CPC Class Codes: E02F 9/2271 Actuators and supports therefor and protection therefor
• CPC Class Codes: E02F 9/2296 Systems with a variable displacement pump
• CPC Class Codes: E02F 9/264 Sensors and their calibration for indicating the position of the work tool
• CPC Class Codes: E02F 9/267 Diagnosing or detecting failure of vehicles
• CPC Class Codes: F15B 15/2807 Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
• CPC Class Codes: F15B 15/2815 Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
• CPC Class Codes: F15B 19/002 Calibrating
• CPC Class Codes: G01D 18/00 Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
• CPC Class Codes: G01D 5/145 influenced by the relative movement between the Hall device and magnetic fields see G01R33/06

Abstract

A stroke operation diagnosis supporting device for a hydraulic cylinder includes: movable portions; hydraulic cylinders; a stroke sensor measuring a stroke length of the hydraulic cylinder; a reset sensor measuring a reset reference point at which a measurement value of the stroke length obtained by the stroke sensor is reset; a stroke end detection process unit detecting a stroke end position of the hydraulic cylinder; a calibration process unit calibrating the measurement value of the stroke length upon the detection of the reset reference point and/or the stroke end position; and a monitor displaying on a screen at least the measurement value of the stroke length obtained by the stroke sensor and a calibration state obtained by the calibration process unit, wherein the monitor displays continuous time change of the measurement value of the stroke length obtained by the stroke sensor.

Claims

1. A stroke operation diagnosis supporting device for a hydraulic cylinder, the stroke operation diagnosis supporting device comprising:

movable portions sequentially supported rotatably to a vehicle main body;

hydraulic cylinders each disposed between the vehicle main body and the movable portion or between the movable portions and rotatably supporting the movable portions;

a stroke sensor provided for the hydraulic cylinder and measuring a stroke length of the hydraulic cylinder;

a reset sensor measuring a reset reference point at which a measurement value of the stroke length obtained by the stroke sensor is reset;

a stroke end detection process unit detecting a stroke end position of the hydraulic cylinder;

a calibration process unit calibrating the measurement value of the stroke length upon the detection of the reset reference point and/or the stroke end position; and

a monitor displaying on a screen at least the measurement value of the stroke length obtained by the stroke sensor and a calibration state obtained by the calibration process unit, wherein the monitor displays continuous time change of the measurement value of the stroke length obtained by the stroke sensor.

2. The stroke operation diagnosis supporting device for a hydraulic cylinder according to claim 1, wherein

the monitor comprises a calibration invalidating setting unit setting validity/invalidity of a calibration process by the reset sensor that is conducted by the calibration process unit, and

when the calibration invalidating setting unit sets the invalidity of the calibration process, the calibration process unit does not calibrate the measurement value of the stroke length.