초록 ▼

A hydraulic pump control system is shown that can control the absorbing torque of a hydraulic pump with respect to the engine power for driving the hydraulic pump in a well-balanced manner, and reduce a deviation of an actual revolution number from a target revolution number of the engine. A torque

A hydraulic pump control system is shown that can control the absorbing torque of a hydraulic pump with respect to the engine power for driving the hydraulic pump in a well-balanced manner, and reduce a deviation of an actual revolution number from a target revolution number of the engine. A torque of hydraulic pumps during operation is estimated from a pump pressure and first and second line pressures. Based on the estimated torque, an output torque of the hydraulic pumps is controlled so that an error between a target revolution number and an actual revolution number of the engine becomes null.

대표청구항 ▼

[ What is claimed is:] [1.] A hydraulic pump control system for use with a variable displacement hydraulic pump driven by an engine and supplying pressurized oil to a hydraulic actuator in accordance with a stroke shift of an operating unit, said control system comprising:means for detecting an actu

[ What is claimed is:] [1.] A hydraulic pump control system for use with a variable displacement hydraulic pump driven by an engine and supplying pressurized oil to a hydraulic actuator in accordance with a stroke shift of an operating unit, said control system comprising:means for detecting an actual revolution number of said engine;means for detecting an output status of said hydraulic pump; andsaid means for detecting an actual revolution number and said means for detecting an output status being connected to a controller for controlling an output torque of said hydraulic pump by estimating a torque of said hydraulic pump during operation from a detection result of said means for detecting an output status and controlling an output torque of said hydraulic pump based on the estimated torque so that an engine revolution number error equal to a difference between a preset target revolution number and the actual revolution number of said engine approaches zero, wherein said controller includes an estimated torque arithmetic section for estimating a delivery oil amount of said hydraulic pump during operation from the detection result of said means for detecting an output status, and computing an estimated torque of said hydraulic pump and an estimated torque change per unit time based on the estimated delivery oil amount.