Patent ID: 9551133
Date: 2017-01-24
CPC Classifications: E02F,F15B,G01D

Claim:
1. A stroke operation calibration control device for a hydraulic cylinder, the stroke operation calibration control 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 the stroke length measured 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 stroke length upon the detection of the reset reference point and/or the stroke end position; a malfunction detection unit outputting an error when the stroke length is out of a stroke range defined by a minimum stroke end position and a maximum stroke end position; and a control unit prohibiting the output of the error until the stroke length has passed the reset reference point at power input time.