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1. 发明公开

EP0503073A4 HYDRAULIC CONTROL SYSTEM IN CONSTRUCTION MACHINE 有权
标题翻译：施工机械液压控制系统
公开(公告)号：EP0503073A4
公开(公告)日：1993-04-14
申请号：EP91915982
申请日：1991-09-11
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
发明人： NAKAMURA, KAZUNORI , KAJITA, YUSUKE , HIRATA, TOICHI , SUGIYAMA, GENROKU , ONOUE, HIROSHI , TANAKA, HIDEAKI , TOMIKAWA, OSAMU , HAGA, MASAKAZU , WATANABE, HIROSHI
IPC分类号： E02F9/22 , E02F3/43 , E02F9/20
CPC分类号： E02F9/2285 , E02F9/2232 , E02F9/2235 , E02F9/2296
摘要： In a controller (229) of a hydraulic control system in a construction machine, a valve control signal calculating function (301), when an operation pattern signal (A-1) of an actuator (201, 202...) is outputted, selects an output pattern from a plurality of output patterns of auxiliary valve control pressure stored in association with the operation pattern signal as a function of a signal of the difference between a discharge pressure of a 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 of corresponding changing speeds (K...K...) from a plurality of sets of changing speeds of auxiliary valve control pressures stored in association with the operation pattern signal, and calculates valve control signals (S21-S26) by combining these auxiliary valve control pressures and changing speeds. A pump control signal calculating function (300), when the operation pattern signal (A-1) is outputted, selects corresponding sets of control gains (LSD, LSU) and of target differential pressures from a plurality of sets of control gains (LSD, LSU) and a plurality of sets of target differential pressures stored in association with the operation pattern signal (A-1), determines a deviation between a differential 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 of the differential pressure and the selected set of control gains (LSD, LSU), to thereby control a displacement of the hydraulic pump (220).
摘要翻译：在施工机械的液压控制系统的控制器（229）中，当输出致动器（201,202 ...）的操作模式信号（AI）时，阀控制信号计算功能（301）选择一个与作为泵的排出压力和最大负载压力之间的差的信号的函数的与操作模式信号相关联地存储的辅助阀控制压力的多个输出模式的输出模式计算辅助阀控制压力 Pc）基于该输出模式对应于差分信号，从与操作模式相关联地存储的辅助阀控制压力的多组变速组中选择一组相应的变化速度（K ... K ...）信号，并通过组合这些辅助阀控制压力和变化速度来计算阀控制信号（S21-S26）。当输出操作模式信号（AI）时，泵控制信号计算功能（300）从多组控制增益（LSD，LSU）中选择相应的一组控制增益（LSD，LSU）和目标压差，和与操作模式信号（AI）相关联地存储的多组目标压差，确定差分信号与其目标压差之间的偏差，并且计算用于减小差分偏差的泵控制信号（S11，S12）通过使用差压的偏差和所选择的一组控制增益（LSD，LSU）来施加压力，从而控制液压泵（220）的位移。

2. 发明公开

EP0465655A4 HYDRAULIC DRIVING APPARATUS OF CIVIL ENGINEERING/CONSTRUCTION EQUIPMENT 有权
标题翻译：民用工程/建筑设备液压驱动装置
公开(公告)号：EP0465655A4
公开(公告)日：1992-03-04
申请号：EP90914966
申请日：1990-10-11
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
发明人： HIRATA, TOICHI , TANAKA, HIDEAKI , SUGIYAMA, GENROKU , KAJITA, YUSUKE, KAWARABA-APARTMENT 101 , NAKAMURA, KAZUNORI
IPC分类号： E02F9/22 , F15B13/04 , F15B11/00 , F15B11/05
CPC分类号： F15B13/0417 , E02F9/2232 , E02F9/2296 , Y10T137/7858
摘要： This invention provides a hydraulic driving apparatus of civil engineering/construction equipment including a hydraulic pump (1), an actuator (2) driven by the pressure oil discharged from this hydraulic pump, a flow rate regulation valve (5) disposed between the hydraulic pump and the actuator, pressure compensation valves (8; 8A; 8B) equipped with a valve spool (23; 23A; 23B) for controlling the pressure difference (PZ - PLS) across this flow rate regulation valve and pump flow rate control means (9) for controlling the discharge flow rate of the hydraulic pump in accordance with the pressure difference (Pd - PLS)) between the pump pressure and the load pressure of the actuator, wherein the pressure compensation valves each include a first control chamber (30; 30A) into which the load pressure (PLS) of the actuator is introduced and which biases the valve spool in the valve opening direction by causing this load pressure to act on the first pressure receiving portion (28; 28A) of the valve spool, a second control chamber (29; 29A) into which the inlet pressure (PZ) of the flow rate regulation valve is introduced and which biases the valve spool in the valve closing direction by causing this inlet pressure to act on the second pressure receiving portion (27; 27A) of the valve spool and target pressure difference setting means (31; 50, 51; 31B, 51) for biasing the valve spool in the valve opening direction and setting the target value of the pressure difference across the flow rate regulation valve. In order to provide the actuator (2) with damping performance, the pressure receiving area (AZ) of the second pressure receiving portion (27; 27A) is made greater than the pressure receiving area (ALS) of the first pressure receiving portion (28; 28A).

3. 发明公开

EP0440807A4 HYDRAULIC DRIVING APPARATUS OF CIVIL ENGINEERING/CONSTRUCTION EQUIPMENT 有权
标题翻译：民用工程/建筑设备液压驱动装置
公开(公告)号：EP0440807A4
公开(公告)日：1993-03-24
申请号：EP90912386
申请日：1990-08-21
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
发明人： NAKAMURA, KAZUNORI
IPC分类号： E02F9/22 , F15B11/00 , F15B11/16
CPC分类号： F15B11/165 , E02F9/2232 , E02F9/2235 , E02F9/2296 , F15B2211/20553 , F15B2211/30525 , F15B2211/3053 , F15B2211/3111 , F15B2211/324 , F15B2211/351 , F15B2211/50536 , F15B2211/6054 , F15B2211/6057 , F15B2211/6309 , F15B2211/6313 , F15B2211/6333 , F15B2211/67 , F15B2211/7142
摘要： A hydraulic driving apparatus of civil engineering/construction equipment of the present invention which includes a main hydraulic pump (2) of a variable capacity type, a plurality of actuators (3, 4) driven by pressure oil discharged from this main hydraulic pump, a plurality of flow rate regulation valves (5, 6) for controlling the flows of the pressure oil supplied to these actuators and pump controllers (30; 30A; 30B) for receiving the pressure difference between the discharge pressure of the main hydraulic pump and the maximum of load pressures of a plurality of actuators as a load sensing pressure difference and for controlling the discharge flow rate of the main hydraulic pump so that this load sensing pressure difference becomes equal to a predetermined target pressure difference, characterized by including flow rate maintaining means (8c; 18) which has zones (8c; 19) insensitive to the pressure difference between a load sensing pressure difference and the target pressure difference, suspends the control by the pump controllers (30; 30A; 30B) when the difference described above exists within the insensitive zones and maintains the discharge flow rate of the main hydraulic pump (2) at a substantially constant level.

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