Steuersystem einer hydraulischen Pumpe

摘要

Disclosed is a hydraulic pump control system which can control the absorbing torque of a hydraulic pump with respect to the engine power in a well-balanced manner, and reduce a deviation of an actual revolution number from a target revolution number of the engine. A torque (Tp) of hydraulic pumps during operation is estimated from a pump pressure (Pp) and first and second line pressures (Pr1, Pr2). Based on the estimated torque (Tp), an output torque (Tr) of the hydraulic pumps is controlled so that an error ( DELTA Ne) between a target revolution number (Nset) and an actual revolution number (Ns) of the engine becomes null.