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11. 发明申请

WO1990010795A1 HYDRAULIC DRIVING UNIT FOR WORKING MACHINE 审中-公开
标题翻译：机械液压驱动装置
公开(公告)号：WO1990010795A1
公开(公告)日：1990-09-20
申请号：PCT/JP1990000325
申请日：1990-03-13
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD. , SUGIYAMA, Genroku , HIRATA, Toichi
发明人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
IPC分类号： F15B11/00
CPC分类号： E02F9/2225 , E02F9/2285 , E02F9/2296 , F15B11/165 , F15B2211/20553 , F15B2211/20584 , F15B2211/253 , F15B2211/30505 , F15B2211/30535 , F15B2211/3111 , F15B2211/329 , F15B2211/351 , F15B2211/50527 , F15B2211/6054 , F15B2211/6346 , F15B2211/6355 , F15B2211/7053 , F15B2211/7058
摘要： This invention relates to a hydraulic driving unit for a working machine, which is provided with hydraulic pump (1); at least one hydraulic actuator (3) driven by hydraulic fluid discharged from the hydraulic pump; a flow rate control valve (4) driven according to the degree of operation of an operating means (4a) to control the flow of the hydraulic fluid fed from the hydraulic pump to the actuator; detection pipings (7a, 7b) for picking up the load pressure in the actuator; and a pressure compensating means (2 or 5) connected to the detection pipings and keeping the difference between the pressure on the upstream side of the flow rate control valve and the load pressure of the actuator on a specified level. This hydraulic driving unit is further equipped with a pressure limiting means (20) disposed with respect to the detection pipings (7a, 7b) to limit the load pressure of the actuator picked up by the detection pipings below a value to be determined according to the degree of operation of the operating means (4a).
摘要翻译：本发明涉及一种用于工作机械的液压驱动装置，其具有液压泵（1）; 由从液压泵排出的液压流体驱动的至少一个液压致动器（3）; 流量控制阀（4），其根据操作装置（4a）的操作程度驱动，以控制从液压泵供给致动器的液压流体的流动; 用于拾取致动器中的负载压力的检测管道（7a，7b）; 以及连接到检测管道并将流量控制阀的上游侧的压力与致动器的负载压力之间的差保持在指定水平的压力补偿装置（2或5）。该液压驱动单元还配备有相对于检测管道（7a，7b）设置的压力限制装置（20），以将由检测管道拾取的致动器的负载压力限制在低于根据操作装置（4a）的操作程度。

12. 发明申请

WO1990002268A1 HYDRAULIC DRIVING APPARATUS 审中-公开
标题翻译：液压驱动装置
公开(公告)号：WO1990002268A1
公开(公告)日：1990-03-08
申请号：PCT/JP1989000893
申请日：1989-08-31
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD. , KAJITA, Yusuke , HIRATA, Toichi , SUGIYAMA, Genroku
发明人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
IPC分类号： F15B11/05
CPC分类号： E02F9/2246 , E02F9/2228 , E02F9/2235 , E02F9/2292 , E02F9/2296
摘要： This invention relates to a hydraulic driving apparatus including a prime mover (21), a hydraulic pump (22) driven by the prime mover, a plurality of hydraulic actuators (23-28) driven by a pressure oil supplied from this hydraulic pump, flow rate control valves (29-34) for controlling the pressure oil supplied to these actuators and pressure compensation valves (35-40) for controlling the pressure differences of these flow rate control valves, whereby each pressure compensation valve is equipped with driving means (45-50, 35c-40c) for providing control force (f-Fc) in a valve opening direction for setting a target value of the pressure difference across each flow control valve. There are also provided first detection means (60) for detecting a target number of revolutions (No) of the prime mover (21) and control means (61, 62, 63) for controlling driving means (45-50, 35c-40c) in such a manner as to decrease the control force (f-Fc) with the decrease in the target number of revolutions at least on the basis of the target number of revolutions detected by the first detection means.
摘要翻译：所述液压驱动装置包括原动机（21），由原动机驱动的液压泵（22），多个由从发动机气门的液压泵输送的加压油驱动的液压致动器（23-28）。用于调节供给致动器的压力油的流量调节器（29-34）以及用于调节流量控制阀的压力差的压力补偿阀（35-40）。每个压力补偿阀设置有用于在阀打开方向上产生控制力（f-Fc）的驱动构件（45-50,35c-40c），以便建立值每个流量控制阀中的压差目标。还提供了用于检测原动机（21）的目标转数（No）的第一检测构件（60），以及用于调节致动器（21）的调节构件（61,62,63）当目标转数至少基于由第一感测元件检测到的目标转数时驱动（45-50,35c-40c）以降低控制力（f-Fc）。

13. 发明申请

WO1997011278A1 HYDRAULIC SYSTEM 审中-公开
标题翻译：液压系统
公开(公告)号：WO1997011278A1
公开(公告)日：1997-03-27
申请号：PCT/JP1996002660
申请日：1996-09-17
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD. , HIRATA, Toichi , SUGIYAMA, Genroku , TOYOOKA, Tsukasa
发明人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
IPC分类号： F15B11/17
CPC分类号： E02F9/2242 , E02F9/2292 , E02F9/2296
摘要： The respective pump ports (9p, 10p, 11p, 13p) of directional control valves (9-11, 13) for a boom, an arm, a bucket and a first drive are connected to first and second hydraulic pumps (1a, 1b) via feeder lines (93a, 93b, 103a, 103b, 113a, 113b, 133a, 133b) which are provided with auxiliary valves (91a, 91b, 101a, 101b, 111a, 111b, 131a, 131b) controlled by proportional solenoid valves (31a, 31b; 32a, 32b; 33a, 33b; 34a, 34b). The auxiliary valves function as variable resistances, including the functions of a check valve and a shut-off valve. This arrangement enables a hydraulic system of a closed center circuit to form a confluent circuit and a preferential circuit of simple structures, and the degree of preference and metering characteristics in a complex operation of an actuator to be set independently of each other.
摘要翻译：用于动臂，臂，铲斗和第一驱动的方向控制阀（9-11,13）的各个泵口（9p，10p，11p，13p）连接到第一和第二液压泵（1a，1b）通过比例电磁阀（31a）控制的辅助阀（91a，91b，101a，101b，111a，111b，131a，131b）的供给管路（93a，93b，103a，103b，113a，113b，133a，133b），31b; 32a，32b; 33a，33b; 34a，34b）。辅助阀具有可变电阻的功能，包括止回阀和截止阀的功能。这种布置使得闭合中心电路的液压系统能够形成合流电路和简单结构的优选电路，以及要彼此独立设置的致动器的复杂操作中的偏好度和计量特性。

14. 发明申请

WO1996000820A1 HYDRAULIC CIRCUIT APPARATUS FOR HYDRAULIC EXCAVATORS 审中-公开
标题翻译：液压挖掘机液压回路装置
公开(公告)号：WO1996000820A1
公开(公告)日：1996-01-11
申请号：PCT/JP1995001258
申请日：1995-06-23
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD. , SUGIYAMA, Genroku , HIRATA, Toichi , ISHIKAWA, Koji , TOYOOKA, Tsukasa , NAKAMURA, Tsuyoshi
发明人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
IPC分类号： E02F03/42
CPC分类号： E02F9/2282 , E02F9/2228 , E02F9/2242 , E02F9/2285
摘要： In order that a boom can be hoisted smoothly in a triple-action operation including boom hoisting, arm crowding and bucket crowding actions, a hydraulic circuit apparatus for a hydraulic excavator is provided in a first valve group in a hydraulic valve unit (12) with a variable throttle valve (70) at the downstream side on a load check valve (32a) in a feeder passage (32) for a directional switching valve (21) for a bucket, and a secondary pressure (C) as a boom hoisting command is introduced into a pilot operating element (70a), which is operated in the throttling direction of the variable throttle valve (70), via a line (71). When the secondary pressure (C) is zero or low, the variable throttle valve is fully opened, and the area of an opening of this variable throttle valve is reduced as the secondary pressure (C) increases, whereby a flow rate of a pressure oil supplied through the directional switching valve (21) for a bucket is restricted.
摘要翻译：为了在包括起重臂提升，斗杆拥挤和铲斗拥挤动作的三重动作操作中能够平稳地提升起重臂，液压挖掘机的液压回路装置设置在液压阀单元（12）的第一阀组中，在用于铲斗的方向切换阀（21）的供给通道（32）中的负载止回阀（32a）的下游侧的可变节流阀（70）和作为悬臂起重指令的二次压力（C）被引入经由管线（71）在可变节流阀（70）的节流方向上操作的先导操作元件（70a）。当二次压力（C）为零或低时，可变节流阀完全打开，并且该可变节流阀的开口面积随着二次压力（C）增加而减小，由此压力油的流量通过用于铲斗的方向切换阀（21）供应的限制。

15. 发明申请

WO1994013959A1 HYDRAULIC REGENERATOR 审中-公开
标题翻译：液压再生器
公开(公告)号：WO1994013959A1
公开(公告)日：1994-06-23
申请号：PCT/JP1993001763
申请日：1993-12-03
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD. , HIRATA, Toichi , SUGIYAMA, Genroku , OCHIAI, Masami
发明人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
IPC分类号： F15B11/02
CPC分类号： E02F9/2282 , E02F9/2217 , E02F9/2221 , E02F9/2296 , F15B11/024 , F15B2011/0243 , F15B2011/0246 , F15B2211/20546 , F15B2211/20576 , F15B2211/30505 , F15B2211/30525 , F15B2211/3058 , F15B2211/3116 , F15B2211/31576 , F15B2211/329 , F15B2211/6303 , F15B2211/6309 , F15B2211/6313 , F15B2211/6316 , F15B2211/6346 , F15B2211/6654 , F15B2211/6655 , F15B2211/67 , F15B2211/7053 , F15B2211/7058 , F15B2211/71 , F15B2211/75 , F15B2211/88
摘要： A hydraulic regenerator provided in a hydraulic driving unit which is provided with a plurality of actuators (4, 5) operated by a pressure oil supplied from a capacity-variable type hydraulic pump (1), and a plurality of direction change-over valves (2, 3) respectively provided between the hydraulic pump and actuators and adapted to control a flow of the pressure oil supplied to the corresponding actuators; and having variable resistance means (6, 60) provided in a first line (12), via which a tank port (23) of at least one direction change-over valve (2) out of the direction change-over valves and a tank (9) communicate with each other, and adapted to control the flow rate of the pressure oil flowing from a tank port to the tank in accordance with a control signal (Px), a third line (14) via which a portion on the upstream side of the variable resistance means in the first line and a second line (10C) connected to pump port (24) of the above-mentioned direction change-over valve communicate with each other, and a check valve (7) provided in the third line and allowing only a flow of the pressure oil running from the first line to the second line. This hydraulic regenerator is further provided with (a) means (101, 106, 102a, 102b, 103a, 103b) for detecting the quantities of state (Pd, Ph, Pia1, Pia2, Pib1, Pib2) associated with the operation of the above actuators, (b) control means (100, 100A-100H) receiving signals from the detecting means and generating on the basis of the preregistered relation driving signals (i, i*) corresponding to the above-mentioned quantities of state, and (c) a control signal generating means (105) adapted to receive the above-mentioned driving signals and generate the above-mentioned control signal (Px) in accordance with the same driving signals, and it is designed so as to enable the characteristics of the variable resistance means to be set arbitrarily, and sudden variation of a regeneration flow rate to be prevented.
摘要翻译：液压再生器设置在液压驱动单元中，该液压驱动单元设置有由从容量可变型液压泵（1）供应的压力油操作的多个致动器（4,5）和多个方向转换阀（分别设置在液压泵和致动器之间并且适于控制供应到相应致动器的压力油的流动; 并且具有设置在第一管线（12）中的可变阻力装置（6,60），通过所述第一管路将至少一个方向转换阀（2）的罐口（23）从所述方向转换阀和罐（9）彼此连通，并且适于根据控制信号（Px）控制从罐口流向罐的压力油的流量;第三管线（14），上游的一部分第一线中的可变电阻装置的侧面和与上述方向转换阀的泵口（24）连接的第二线路（10C）彼此连通，并且设置在第三线路中的止回阀（7）并且仅允许从第一线路运行到第二线路的压力油的流动。该液压再生器还设置有（a）用于检测与上述操作相关联的状态量（Pd，Ph，Pia1，Pia2，Pib1，Pib2）的装置（101,106,102a，102b，103a，103b）致动器，（b）从检测装置接收信号并基于与上述数量的状态相对应的预注册关系驱动信号（i，i *）产生的控制装置（100,100A-100H）和（c ）控制信号发生装置（105），其适于接收上述驱动信号并根据相同的驱动信号产生上述控制信号（Px），并且被设计成使得可变的特性电阻装置被任意设定，并且可防止再生流量的突然变化。

16. 发明申请

WO1993021395A1 HYDRAULIC CIRCUIT DEVICE FOR CONSTRUCTION MACHINES 审中-公开
标题翻译：用于建筑机械的液压电路装置
公开(公告)号：WO1993021395A1
公开(公告)日：1993-10-28
申请号：PCT/JP1993000508
申请日：1993-04-20
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD. , SUGIYAMA, Genroku , HIRATA, Toichi
发明人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
IPC分类号： E02F03/43
CPC分类号： F15B13/0403 , E02F9/2232 , E02F9/2239 , E02F9/2282 , E02F9/2292 , E02F9/2296 , F15B11/161 , F15B11/17 , F15B13/0418 , F15B2211/20553 , F15B2211/20576 , F15B2211/30555 , F15B2211/3116 , F15B2211/3127 , F15B2211/329 , F15B2211/351 , F15B2211/365 , F15B2211/40515 , F15B2211/428 , F15B2211/45 , F15B2211/6054 , F15B2211/6057 , F15B2211/6355 , F15B2211/7058 , F15B2211/7142 , F15B2211/78
摘要： A hydraulic circuit device for construction machines wherein a first pressure regulator (130) for controlling the downstream pressure of first variable throttles (107, 107a) to a value corresponding to a first signal pressure is disposed between the first variable throttles of a directional control valve (47) for leftward running and a first running motor (57), and wherein a second pressure regulator (133) for controlling the downstream pressure of second variable throttles (108, 108a) to a value corresponding to a second signal pressure is disposed between the second variable throttles of a directional control valve (49) for rightward running and a second running motor (57). A negative pressure of either the first or second running motor, whichever is higher, is detected by a shuttle valve (136) as a maximum negative pressure, and signal switching valves (131, 135, 170) are caused to operate during combination operation in which the first and second running motors and at least one of a plurality of work machine actuators (53 to 56) are simultaneously driven, whereby themaximum negative pressure is imparted to the first and second pressure regulators as first and second signal pressures. Even when this enables a communication circuit (110) to be put into operation as the work machine actuators are put into operation during combination operation in which running and the operation of the work machine are simultaneously effected to thereby allow a pressure oil supply circuit (104) of the second directional control valve for rightward running and a pressure oil supply circuit (103) of the first directional control valve for leftward running to communicate with each other, differences in pressure across the first and second throttles become substantially equal to each other, thereby making it possible to secure a straight running capability.
摘要翻译：一种用于施工机械的液压回路装置，其中用于将第一可变节流阀（107,107a）的下游压力控制为对应于第一信号压力的值的第一压力调节器（130）设置在方向控制阀的第一可变节流阀（47）和第一行驶马达（57），并且其中用于将第二可变节流阀（108,108a）的下游压力控制为对应于第二信号压力的值的第二压力调节器（133）设置在用于向右行驶的方向控制阀（49）的第二可变节流阀和第二行驶马达（57）。第一或第二运行电机的负压（以较高者为准）由梭阀（136）作为最大负压检测，并且使信号切换阀（131,135,170）在组合操作期间操作其中第一和第二运行电动机以及多个作业机械致动器（53至56）中的至少一个被同时驱动，由此最大负压作为第一和第二信号压力被赋予第一和第二压力调节器。即使当这样使得通信电路（110）能够在组合操作中投入运行时，其中同时进行作业机的运行和操作，从而允许压力油供应回路（104 ）和用于向左行驶的第一方向控制阀的压力供油回路（103）彼此连通，所述第一和第二节流阀两端的压力差基本上彼此相等，从而能够确保直线行驶能力。

17. 发明申请

WO1992009809A1 HYDRAULIC DRIVING SYSTEM AND DIRECTION CHANGE-OVER VALVES 审中-公开
标题翻译：液压驱动系统和方向变更阀
公开(公告)号：WO1992009809A1
公开(公告)日：1992-06-11
申请号：PCT/JP1991001621
申请日：1991-11-26
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD. , HIRATA, Toichi , SUGIYAMA, Genroku
发明人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
IPC分类号： F15B11/00
CPC分类号： F15B13/0403 , E02F9/2232 , E02F9/2296 , F15B11/163 , F15B13/0417 , F15B2211/20546 , F15B2211/253 , F15B2211/30535 , F15B2211/30555 , F15B2211/31576 , F15B2211/45 , F15B2211/851
摘要： Each of direction change-over valves (5, 6) respectively provided between a hydraulic supply system (50) and a plurality of actuators (3, 4) comprises: a pump port (9); a pressure chamber (10); a feeder path (11); actuator ports (12a, 12b); a tank port (13); first variable throttles (15a, 15b) of a meter-in system, which are provided between the pump port and the pressure chamber; and a pressure compensation valve (16) provided between the pressure chamber and the feeder path, one of opposing ends of which receives pressure from the pressure chamber and the other end of which receives the maximum of load pressures of the plurality of actuators. The hydraulic supply system comprises: a hydraulic pump (1); and a pump flowrate control device (2) for controlling a discharge flowrate of the hydraulic pump in such a manner that discharge pressure of the hydraulic pump is higher by a predetermined value than the maximum of load sensing pressures obtained from load pressures of the plurality of actuators. At least one of the direction change-over valves further comprises: a bleed path (21) for connecting the feeder path (11) and the tank port (13) to each other; and second variable throttles (22a, 22b) provided in this bleed path and interlocked with the first variable throttles of the meter-in system. With this arrangement, an abrupt action of the actuators for driving an inertial member is prevented and vibrations of the circuit are controlled even when one of a pump discharge flowrate and a load pressure is fluctuated.

18. 发明申请

WO1990011464A1 VALVE DEVICE AND HYDRAULIC DRIVING APPARATUS 审中-公开
标题翻译：阀门装置和液压驱动装置
公开(公告)号：WO1990011464A1
公开(公告)日：1990-10-04
申请号：PCT/JP1990000391
申请日：1990-03-23
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD. , HIRATA, Toichi , SUGIYAMA, Genroku
发明人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
IPC分类号： F16K11/07
CPC分类号： F15B13/0842 , F15B13/06 , Y10T137/87185
摘要： A valve device according to the present invention includes a casing (11; 41) provided with at least one pair of parallel arranged spool bores (12a, 13a, etc.; 42a, 43a), one common pump port (19), at least one tank port (16t), and a plurality of actuator ports (22a, 23a, etc.) including two actuator ports communicating with each spool bore; and at least one pair of parallel arranged spools (14a, 15a, etc.; 44a, 45a) inserted slidably in the spool bores in the casing and adapted to control the communication among the common pump port, tank port and two actuator ports. The common pump port communicates with a common pump line (18), which is formed so that the pump line crosses a plane of the axes of the two parallel arranged spool bores and spools, between the spool bores and spools. A hydraulic driving apparatus according to the present invention is constructed by using this valve device.

19. 发明申请

WO1997022914A1 METHOD OF OUTPUT CORRECTION FOR CONTROL APPARATUS, THE CONTROL APPARATUS, AND HYDRAULIC PUMP CONTROL APPARATUS 审中-公开
标题翻译：控制装置输出校正方法，控制装置和液压泵控制装置
公开(公告)号：WO1997022914A1
公开(公告)日：1997-06-26
申请号：PCT/JP1996002517
申请日：1996-09-05
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD. , KOWATARI, Youichi , HIRATA, Toichi , TAKEGAHARA, Hidefumi , TOYOOKA, Tsukasa , ISHIKAWA, Kouji , SUGIYAMA, Genroku , YOSHINAGA, Shigehiro
发明人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
IPC分类号： G05B11/36
CPC分类号： G05B24/02 , E02F9/2025 , E02F9/2235 , E02F9/2282 , E02F9/2285 , E02F9/2296 , F04B49/065 , F04B2201/12041 , F04B2203/0201 , F04B2205/062 , G05B11/36 , G05B13/0265
摘要： When a mode signal Sm of a mode switch (13) is ON, an arithmetic unit (12a) of a controller (12) executes learning control in which a driving current (I) corresponding to a predetermined target pump rotation theta 0 is supplied to a proportional solenoid valve (3) to determine the difference between the target pump rotation theta 0 and actual pump rotation theta and the difference is stored as a corrective value DELTA theta 0 in an EEPROM of a memory unit (12b). When the mode signal Sm of the mode switch (13) is OFF, the arithmetic unit executes normal control in which the corrective value DELTA theta 0 stored in the memory unit (12b) is added to the target pump rotation theta 0 and a driving current (I) corresponding to this corrected target pump rotation theta 0 is supplied to the proportional solenoid valve (3). Therefore, even when any variance exists in the input/output characteristics of a regulator as displacement control means (control objet) of a hydraulic pump and the proportional solenoid valve, variance of actual pump rotation as the output of the control object can be reduced.
摘要翻译：当模式开关（13）的模式信号Sm为ON时，控制器（12）的运算单元（12a）执行学习控制，其中对应于预定目标泵旋转θ0的驱动电流（I）被提供给用于确定目标泵旋转θ0和实际泵旋转θ之间的差的比例电磁阀（3），并且差值作为校正值DELTAθ0存储在存储器单元（12b）的EEPROM中。当模式开关（13）的模式信号Sm为OFF时，运算单元执行正常控制，其中将存储在存储单元（12b）中的校正值DELTAθ0添加到目标泵旋转θ0和驱动电流对应于该校正的目标泵旋转θ0的（I）被提供给比例电磁阀（3）。因此，即使在作为液压泵和比例电磁阀的位移控制装置（控制对象）的调节器的输入/输出特性中存在任何差异的情况下，也可以减少作为控制对象的输出的实际泵旋转的变化。

20. 发明申请

WO1996027741A1 HYDRAULIC CONTROLLER 审中-公开
标题翻译：液压控制器
公开(公告)号：WO1996027741A1
公开(公告)日：1996-09-12
申请号：PCT/JP1996000498
申请日：1996-03-01
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD. , SUGIYAMA, Genroku , HIRATA, Toichi
发明人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
IPC分类号： F15B20/00
CPC分类号： F15B21/045 , F04B49/065 , F04B49/08 , F04B49/10 , F04B2205/05 , F04B2205/062 , F04B2205/11 , F15B20/002
摘要： In a hydraulic controller, in order to easily provide a hydraulic back-up in the event of a failure of an electric system while maintaining a benefit of electrical control using a control unit (13) when controlling a displacement of a hydraulic pump (1) in accordance with a property of a hydraulic driving system, a pump regulator (16) is constructed such that the tilt theta of a swash plate (1a) increases as the pressure of a second oil pressure signal P.c decreases, the pump regulator is characterized in that a negative control pressure can be used instead of the second oil pressure signal, and the properties of a fixed throttle (10) and the pump regulator spring (18d) are set such that the pump regulator can be operated within an operation range of the negative control pressure. In a controlling unit (13), a negative control pressure Pc1 corrected in a block (102) is made to be a target value of the second oil pressure signal, a second electric signal E corresponding to the target value is obtained, and the operational range of a second oil pressure signal generated by a solenoid proportional valve (15) is made substantially equal to the negative control pressure.
摘要翻译：在液压控制器中，为了在控制液压泵（1）的位移时，在维持使用控制单元（13）的电控制的同时保持电气控制的故障的情况下容易地提供液压备用，根据液压驱动系统的特性，泵调节器16被构造成使得当第二油压信号Pc的压力降低时斜盘（1a）的倾斜角度增加，泵调节器的特征在于可以使用负控制压力代替第二油压信号，并且设定固定节气门（10）和泵调节器弹簧（18d）的特性，使得泵调节器可以在负控制压力。在控制单元（13）中，将块（102）中校正的负控制压力Pc1设定为第二油压信号的目标值，获得与目标值对应的第二电信号E，由电磁比例阀（15）产生的第二油压信号的范围基本上等于负控制压力。

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