Working vehicle

Abstract

A working vehicle is provided for improving safety and work efficiency by changing a travel speed limit appropriately depending on forms and conditions of work. The working vehicle is driven with an engine, and a working machine such as a working pump is mounted on the vehicle. Fuel supplied to the engine is regulated by an injector. Travel speeds of the working vehicle are detected with a vehicle speed sensor. A control unit is provided with a high speed travel mode which limits vehicle speed at or below a predetermined high speed limit and a low speed travel mode which limits vehicle speed at or below a low speed limit which is set below the high speed limit. In this way, either the high speed travel mode or the low speed travel mode is set according to a changeover signal from a travel mode changeover switch.

What is claimed is:  
     
         1 . A working vehicle driven by an engine and traveling with a working machine mounted thereon, comprising: 
 a vehicle speed sensor for detecting a travel speed of said working vehicle;    travel mode changeover means for setting any one of a plurality of travel modes with different predetermined speed limits; and    control means for controlling said working vehicle in such a manner that the travel speed of said working vehicle detected by said vehicle speed sensor does not exceed a predetermined speed limit of the travel mode set by said travel mode changeover means.    
     
     
         2 . The working vehicle according to  claim 1 , wherein said travel mode changeover means includes a switch operated by an operator of said working vehicle.  
     
     
         3 . The working vehicle according to  claim 1 , wherein said travel mode changeover means includes a switch operated by a vehicle supervisor, said switch being non-operatable by an operator when the working vehicle is traveling.  
     
     
         4 . The working vehicle according to  claim 1 , further comprising: 
 weight detecting means for detecting a weight of said working machine mounted on said working vehicle, wherein said travel mode changeover means automatically changes over the travel modes depending on the weight detected by said weight detecting means.    
     
     
         5 . The working vehicle according to  claim 1 , further comprising: 
 warning means for warning an operator that the travel speed is approaching the predetermined speed limit when entering a predetermined range below the predetermined speed limit of each travel mode.    
     
     
         6 . The working vehicle according to  claim 1 , further comprising: 
 fuel regulating means for regulating fuel to be supplied to said engine,    wherein supplying the fuel is stopped by said fuel regulating means when the travel speed exceeds the predetermined speed limit.    
     
     
         7 . The working vehicle according to  claim 6 , wherein the supplying of the fuel is recovered by said fuel regulating means after the travel speed is lowered below the predetermined speed limit so that a normal control of the engine can be restarted.