CYLINDER POSITION MEASURING DEVICE AND CYLINDER POSITION MEASURING METHOD

摘要

An arithmetic processing portion is configured to perform a correction process for resetting an original position of the stroke position by using at least detection results of a voltage value of a first magnetic force sensor as well as a second magnetic force sensor according to the piston movement, and further not to perform the correction process to reset the original position of the stroke position by using the detection result of the first magnetic force sensor and the second magnetic force sensor right after an abutment when the piston is abutted to the stroke end based on a detection result of a stroke end abutment detecting system.

主权项

1. A cylinder position measuring device for measuring a position of a linearly moving member that linearly moves inside a cylinder tube, comprising:
a stroke position sensor for detecting a stroke position of the linearly moving member; a magnet disposed on the linearly moving member; a magnetic force sensor disposed outside the cylinder tube; a stroke end abutment detecting system for detecting an abutment of the linearly moving member to a stroke end; an arithmetic processing portion configured to perform a correction process to reset an original position of the stroke position by using a detection value of the magnetic force sensor according to a movement of the linearly moving member while the linearly moving member is not abutted to the stroke end, and not to perform the correction process at least about a first correction process after the abutment when the linearly moving member has been abutted to the stroke end.