초록 ▼

A control system for a hydraulic excavator having a prime mover, revolution number control device for the prime mover, at least one variable displacement hydraulic pump driven by the prime mover, displacement volume control device for the pump, actuators driven by pressurized fluid discharged from t

A control system for a hydraulic excavator having a prime mover, revolution number control device for the prime mover, at least one variable displacement hydraulic pump driven by the prime mover, displacement volume control device for the pump, actuators driven by pressurized fluid discharged from the pump and working elements driven by the respective actuators. The control system includes maximum revolution number altering device for the prime mover associated with the revolution number control device, maximum displacement volume altering device for the pump associated with the displacement volume control devices, devices for sensing the operation condition of the actuators, devices for selecting an operation mode for each working element and control devices. The maximum revolution number altering device provides at least one maximum revolution number of the prime mover and the maximum displacement volume altering device provides at least one maximum displacement volume so that maximum revolution numbers of the prime mover and maximum displacement volumes are arranged in a plurality of combinations. The plurality of combinations are set in association with the operation condition of the actuators and the selection of the operation mode. The control means selects a combination of the maximum revolution number of the prime mover and the maximum displacement volume of the pumps on basis of output signals of the sensors and selection devices and drives the maximum revolution number altering device and the maximum displacement volume altering device to set the maximum revolution number of the prime mover and the maximum displacement volume of the hydraulic pump.

대표청구항 ▼

A control system for a hydraulically-operated construction machinery comprising a prime mover, means for controlling the revolution number of said prime mover, at least one variable displacement hydraulic pump driven by said prime mover, means for controlling the displacement volume of said pump, a

A control system for a hydraulically-operated construction machinery comprising a prime mover, means for controlling the revolution number of said prime mover, at least one variable displacement hydraulic pump driven by said prime mover, means for controlling the displacement volume of said pump, a plurality of actuators driven by pressurized fluid discharged from the pump and a plurality of working elements driven by the respective actuators, said control system comprising: means associated with said revolution number control means for altering the maximum revolution number of said prime mover; means associated with said displacement volume control means for altering the maximum displacement volume of the pump; means for sensing the operation condition of the actuators; means for selecting an operation mode for each working element; the maximum revolution number altering means providing at least one maximum revolution number of the prime mover and the maximum displacement volume altering means providing at least one maximum displacement volume so that maximum revolution numbers of the prime mover and maximum displacement volumes of the pump are arranged in a plurality of combinations, said plurality of combinations being set in association with the operation condition of the actuators and the selection of the operation mode; and control means for selecting a combination of the maximum revolution number and the maximum displacement volume on basis of output signals of said sensor means and selection means and driving the maximum revolution number altering means and the maximum displacement volume altering means to set the maximum revolution number of the prime mover and the maximum displacement volume of the hydraulic pump to the contents of the selected combination.