| 摘要 |
PURPOSE: An auto-control system is provide to adjust output of engine and pump of an excavator based on working condition by applying self-working mode to a controller portion of the system to detect working speed and working load to execute mathematical operation of the working mode. CONSTITUTION: The system comprises a joy-sticks(9a,9b); a main control valve(8a-8d) to output hydraulic pressure to cylinders(10a-10d) by motion control signals of a controller(1); an engine(6) to provide revolution force for power supply of entire hydraulic system; a first and a second pumps(7a,7b) to transfer the revolution force into the hydraulic pressure and to output it to the valves(8a-8d); a working mode set-up portion(2); the controller portion(1) to adjust revolution numbers of the engine(6) and input torques of the pumps(7a,7b), to receive detected values from a first and a second pump pressure sensors(5a,5b) and a first and a second negative pressure sensors(11a,11b), to calculate working speed and load and to count the revolution numbers and output values of the pumps(7a,7b); a pump controller(3); and an engine controller(4).
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