Importance

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Abstract

An industrial vehicle has a loading attachment, a mast, a tilt cylinder, first and second pressure sensors and a controller. The mast supports the attachment and guides the attachment. The tilt cylinder has a piston and a piston rod and operates by hydraulic fluid from a hydraulic fluid source. The piston rod connects with the piston and also connects with the mast. The piston divides the inside of the tilt cylinder into a rod side chamber and a bottom side chamber. The first and second pressure sensors respectively detect pressures of the hydraulic fluid in the rod side and the bottom side chambers. The controller calculates an axial force applied to the tilt cylinder based on signals detected by the sensors and calculates load weight moment in a back and forth direction of the vehicle based on the axial force and compares the calculated moment with a predetermined value.

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First Claim