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专利名称：HYDRAULIC CONTROL SYSTEM IN
CONSTRUCTION MACHINE
发明人：NAKAMURA, KAZUNORI,KAJITA,
YUSUKE,HIRATA, TOICHI,SUGIYAMA,GENROKU,ONOUE, HIROSHI,TANAKA,HIDEAKI,TOMIKAWA, OSAMU,HAGA,MASAKAZU,WATANABE, HIROSHI
申请号：EP91915982申请日：19910911公开号：EP0503073A4公开日：19930414
摘要：In a controller (229) of a hydraulic control system in a construction machine, avalve control signal calculating function (301), when an operation pattern signal (A-I) of anactuator (201, 202...) is outputted, selects an output pattern from a plurality of outputpatterns of auxiliary valve control pressure stored in association with the operationpattern signal as a function of a signal of the difference between a discharge pressure ofa pump and a maximum load pressure, calculates an auxiliary valve control pressure (Pc)corresponding to the differential signal based on this output pattern, selects a set ofcorresponding changing speeds (K...K...) from a plurality of sets of changing speeds ofauxiliary valve control pressures stored in association with the operation pattern signal,and calculates valve control signals (S21-S26) by combining these auxiliary valve controlpressures and changing speeds. A pump control signal calculating function (300), whenthe operation pattern signal (A-I) is outputted, selects corresponding sets of control
gains (LSD, LSU) and of target differential pressures from a plurality of sets of controlgains (LSD, LSU) and a plurality of sets of target differential pressures stored inassociation with the operation pattern signal (A-I), determines a deviation between adifferential signal and its target differential pressure, and calculates pump control signals(S11, S12) for decreasing this deviation of differential pressure by use of this deviation ofthe differential pressure and the selected set of control gains (LSD, LSU), to therebycontrol a displacement of the hydraulic pump (220).
申请人：HITACHI CONSTRUCTION MACHINERY CO., LTD.
地址：6-2, OHTEMACHI 2-CHOME; CHIYODA-KU TOKYO 100
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