Method for controlling a raise/extend function of a work machine

Abstract

A method for controlling the raise/extend function of a work machine is provided. The method comprises sensing the position of a frame and the position of a telescopic boom of the work machine, comparing the sensed positions to a desired position and controlling the raise/extend operation in response to the actual verses the desired positions.

What is claimed is:  
     
         1 . A method for controlling a boom raise/extend function of a work machine, the work machine having a longitudinal frame, a telescopic boom and a support member, said method comprising: 
 sensing the position of the frame and the telescopic boom;    comparing the sensed positions of the frame and the telescopic boom to a desired predetermined limit;    controlling the boom raise/extend in response to the comparison between the sensed positions of the frame and the telescopic boom to the desired predetermined limit.    
     
     
         2 . The method of  claim 1 , wherein controlling the boom raise/extend includes allowing the raise/extend function if the sensed positions of the frame and the telescopic boom is within the desired predetermined limit.  
     
     
         3 . The method of  claim 1 , wherein controlling the boom raise/extend includes disabling the raise/extend function if the sensed positions is not within the predetermined limit.  
     
     
         4 . The method of  claim 3 , including allowing the frame to be automatically leveled until the frame position is within the predetermined limit.  
     
     
         5 . The method of  claim 1 , wherein controlling the boom raise/extend includes allowing limited raise/extend function if the sensed positions is not within the predetermined limit.  
     
     
         6 . The method of  claim 5 , wherein controlling the boom raise/extend includes disabling the raise/extend function if further raise/extend of the telescopic boom will place the work machine in an unsafe position.