| 摘要 |
A hydraulic pump control method is provided to operate an engine with rated rotational frequency by setting the target rotational frequency of an engine according to the pressure variation of fluids discharged from a hydraulic pump and controlling an electronic proportional pressure reducing value according to a difference between the target rotational frequency and the actual rotational frequency of an engine, and controlling the discharge quantity of a hydraulic pump, thereby controlling the output of a hydraulic pump operated with the load of an engine. A hydraulic pump control method comprises the steps of: operating an engine with rated rotational frequency under the order of an electronic control unit if a driver operates an operating unit to perform the appointed work such as excavation work or leveling work(S200); measuring the discharge pressure of a hydraulic pump in a pressure measurement unit, and transferring the measured pressure value to the electronic control unit(S204); calculating the pressure variation with the measured pressure value by the pressure measurement unit, and comparing the pressure variation with standard value in the electronic control unit(S206); in case of heavy load, outputting the varied rotational frequency of the engine according to a difference between the pressure variation of fluids and the standard value in the electronic control unit(S208), and setting the target rotational frequency of the engine by adding the varied rotational frequency to the rated rotational frequency of the engine in the electronic control unit(S210); in case of light load, outputting the varied rotational frequency of the engine according to a difference between the pressure variation of fluids and the standard value in the electronic control unit(S212), and setting the target rotational frequency of the engine by deducting the varied rotational frequency from the rated rotational frequency of the engine in the electronic control unit(S214); comparing the set target rotational frequency of the engine with the measured rotational frequency of the engine, and setting the electric current quantity to be provided to an electronic proportional pressure reducing valve by a proportion and differential calculation in the electronic control unit(S216); providing the calculated electric current value to the electronic proportional pressure reducing value in the electronic control unit(S218); controlling the swash plate swivel angle of the hydraulic pump according to the electric current value provided to the electronic proportional pressure reducing valve, and regulating the discharge quantity of the hydraulic pump with the regulated swivel angle in a pump regulator and rotating the engine in the rated rotational frequency(S220); and stopping the engine under the order of the electronic control unit(S222). |
