Materials handling vehicle having control structure to measure an electric current flow into or out of a hydraulic system motor

摘要

A materials handling vehicle is provided comprising: a support structure including a fixed member (230); a movable assembly (300) coupled to the support structure; a hydraulic system (401); and a control system. The support structure further comprises lift apparatus to effect movement of the movable assembly relative to the support structure fixed member. The lift apparatus includes at least one ram/cylinder assembly (222). The hydraulic system includes a motor (301), a pump (302) coupled to the motor to supply a pressurized fluid to the at least one ram/cylinder assembly, and at least one electronically controlled valve (420) associated with the at least one ram/cylinder assembly. The control structure may measure an electric current flow into or out of said hydraulic system motor and to reduce an operating speed of said hydraulic system motor if the electric current flow into or out of said hydraulic system motor is greater than or equal to a predetermined threshold value.