A MATERIALS HANDLING VEHICLE HAVING A STEER SYSTEM INCLUDING A TACTILE FEEDBACK DEVICE

摘要

A materials handling vehicle is provided, comprising a frame comprising an operator's compartment; wheels supported on said frame; and a traction motor coupled to one of said wheels to effect rotation of said one wheel. The vehicle further comprises a steer-by-wire system associated with a steerable wheel to effect angular movement of said steerable wheel about a first axis. The steer-by-wire system comprises a control handle capable of being moved by an operator; a steer motor coupled to said steerable wheel to effect angular movement of said steerable wheel about the first axis; and a control apparatus. The control apparatus is coupled to said steer motor to generate a first drive signal to said steer motor to effect angular movement of said steerable wheel about the first axis. The control apparatus is also coupled to the traction motor to generate a second drive signal to the traction motor to control its speed. Finally, the control apparatus is arranged to vary the first drive signal to the steer motor as a function of the speed of the traction motor so as to vary a speed limit of the steer motor.