Industrial vehicle with a device for measuring load weight moment and a method therefor

A forklift truck comprising:

• a loading attachment;
• a mast supporting said loading attachment, said mast guiding movement of said loading attachment to be raised and lowered;
• a tilt cylinder operated by hydraulic fluid from a hydraulic fluid source, said tilt cylinder having a piston and a piston rod within said cylinder, the piston rod being connected to the piston at its one end and connected to said mast at the other end, the piston dividing the inside of said tilt cylinder into a rod side chamber and a bottom side chamber;
• a first pressure sensor for detecting pressure of the hydraulic fluid in the rod side chamber of said tilt cylinder;
• a second pressure sensor for detecting pressure of the hydraulic fluid in the bottom side chamber of said tilt cylinder;
• and
• a controller for calculating axial force of said tilt cylinder based on detected signals from said first and second sensors,
• wherein said controller further calculates load weight moment in a back and forth direction of the forklift truck based on the axial force, and said controller compares the calculated load weight moment with a predetermined value.