Patent ID: 8838349

Claim:
A traveling control system for a construction machine comprising: first and second variable displacement hydraulic pumps connected to an engine; a variable displacement left-traveling motor and a first hydraulic cylinder for a work apparatus that are connected to the first hydraulic pump and respectively driven when their spools are shifted; a variable displacement right-traveling motor and a second hydraulic cylinder for the work apparatus that are connected to the second hydraulic pump and respectively driven when their spools are shifted; a traveling speed selector configured to select either a low traveling speed or a high traveling speed; a low-speed/high-speed switching solenoid valve configured to output a signal pressure to control the swivel angles of swash plates of the left and right traveling motors in response to a selection signal outputted from the traveling speed selector; left and right traveling spools configured to control a start, a stop, and a direction change of the left and right traveling motors; a left and right traveling manipulator configured to shift the left and right traveling spools; first and second work apparatus spools configured to control a start, a stop and a direction change of the first and second hydraulic cylinders; a first and second work apparatus manipulator configured to shift the first and second work apparatus spools; and a controller configured to determine whether or not the a left and right traveling manipulator and the a first and second work apparatus manipulator are manipulated in case of a combined operation in which the two-way traveling operation and the operation of the work apparatus are performed in a low speed traveling mode and output a high speed traveling control signal to the solenoid valve to minimize the swivel angles of the swash plates of the left and right traveling motors.