Dumping work determination system for haulage vehicle

A dumping work determination system for a haulage vehicle provided with a body frame, a vessel disposed above the body frame to load therein an object to be hauled, and a drive mechanism disposed on the body frame to permit selectively raising or lowering the vessel relative to the body frame such that upon dumping the object from the vessel, the vessel is lifted up and raised, said dumping work determination system being applicable to the haulage vehicle to determine a state of loading in the vessel in dumping work from the haulage vehicle, wherein:

• the dumping work determination system comprises:
• a body frame speed detector that detects a speed of the body frame,
• a tilted state detector that detects a tilted state of the vessel relative to the body frame,
• a shake detector that detects shakes of the vessel, which occur upon dumping the object from the vessel,
• a payload-stuck state determination unit that based on signals from the body frame speed detector, tilted state detector and shake detector, determines whether or not the state of loading in the vessel in the dumping work is a payload-stuck state indicative of a state that the object is stuck in the vessel, and
• an output unit that outputs a result of the determination by the payload-stuck state determination unit;
• and
• the payload-stuck state determination unit determines the state of loading in the vessel to be the payload-stuck state when the speed of the body frame is detected by the body frame speed detector to have reached lower than a predetermined speed, the vessel is detected by the tilted state detector to have tilted to a predetermined position, and a state where the vessel can be considered to have no longer produced shakes is detected by the shake detector.