Price, Heneveld, Cooper, DeWitt & Litton
System for automatically controlling relative operational velocity of actuators of construction vehicles
 A system for automatically controlling the actuators of a construction vehicle. The system comprises electronic controller, an automatic selecting switch for selecting automatic control for actuators, as requested, control levers for being manipulated by an operator in order to instruct the controller of desired operations of the actuators, and positional sensors for sensing respective positions of the actuators and outputtng signals corresponding to the positions of the actuators to the controller. In the system, the actuators during performing repeated operations are such automatically controlled that they are controlled during a first operation by the operator's manipulations for the control levers, thereafter, during each sequential operation, they are automatically controlled by the controller on the basis of electric control currents having been automatically calculated by virtue of a displacement ratio between the actuators during a just previous operation. The system provides, therefore, advantage in that is provided with no relative operational velocity ratio setting device and causes the operator to omit a repeated setting by experience for the velocity ratio, thereby improving the operational effect of the excavator. 
Samsung Heavy Industries Co., Ltd.
E
E02F
inventional
Ju-kyung
Kim