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1. 发明授权

US07255088B2 Engine control system for construction machine 有权
标题翻译：施工机械发动机控制系统
公开(公告)号：US07255088B2
公开(公告)日：2007-08-14
申请号：US10527418
申请日：2004-06-24
申请人： Kazunori Nakamura , Yasushi Arai , Yoichi Kowatari , Kouji Ishikawa , Hideo Karasawa
发明人： Kazunori Nakamura , Yasushi Arai , Yoichi Kowatari , Kouji Ishikawa , Hideo Karasawa
IPC分类号： F02D41/04 , F02D41/14
CPC分类号： F02D31/007 , F02D41/12
摘要： An engine control system includes pressure sensors (73, 74), position sensors (75, 76), pressure sensors (77, 78), a target revolution speed modification value computing unit (90), and a modification value adder (70r). A target revolution speed NR2 for use in control is computed based on changes of status variables such that the target revolution speed NR2 increases from the target revolution speed NR1 applied from an input unit (71), and then moderately returns to the target revolution speed NR1. In accordance with the computed target revolution speed NR2 for use in control, a target fuel injection amount FN1 is computed and a fuel injection amount is controlled. As a result, a drop of an engine revolution speed attributable to an abrupt increase of an engine load can be suppressed without sacrificing the work efficiency, and lowering of durability caused by an excessive increase of the engine revolution speed can be prevented.
摘要翻译：发动机控制系统包括压力传感器（73,74），位置传感器（75,76），压力传感器（77,78），目标转速修正值计算单元（90）和修正值加法器（70r）。根据状态变量的变化，计算目标转速NR2，使得目标转速NR2从从输入单元（71）施加的目标转速NR 1增加，然后适度返回到目标转速NR 1。根据用于控制的计算出的目标转速NR2，计算目标燃料喷射量FN1，并控制燃料喷射量。结果，可以在不牺牲工作效率的情况下抑制由于发动机负载突然增加引起的发动机转速的下降，并且可以防止由于发动机转速过大而导致的耐久性降低。

2. 发明申请

US20080236157A1 Engine Lag Down Suppressing Device of Construction Machinery 有权
标题翻译：发动机减速机施工机械
公开(公告)号：US20080236157A1
公开(公告)日：2008-10-02
申请号：US10569490
申请日：2004-08-27
申请人： Yoichi Kowatari , Yasushi Arai , Kouji Ishikawa , Kazunori Nakamura , Nobuei Ariga , Hideo Karasawa , Yuuki Gotou , Motoyuki Yabuuchi
发明人： Yoichi Kowatari , Yasushi Arai , Kouji Ishikawa , Kazunori Nakamura , Nobuei Ariga , Hideo Karasawa , Yuuki Gotou , Motoyuki Yabuuchi
IPC分类号： F16D31/00
CPC分类号： F04B49/08 , E02F9/2246 , E02F9/2285 , E02F9/2296 , F04B17/05 , F15B2211/20553 , F15B2211/633 , F15B2211/6346 , F15B2211/6652 , F15B2211/851
摘要： An engine lag down suppressing device of construction machinery, comprising a vehicle body controller (13) having a first torque control means and a second torque control means, and a third torque control means. The first torque control means controls a torque control valve (7) to the minimum pump torque (value: Min) according to a target engine rotational speed (Nr) when the operating device (5) in the non-operated state of an continues for a monitoring time (TX1) to suppress an engine lag down after a specified holing time to hold a torque to a low pump torque is passed when the operating device in the non-operated state is operated. The second torque control means controls the torque control valve (7) to hold the minimum pump torque for a specified holding time (Tx2) after the operating device (5) in the non-operated state is operated. The third torque control means comprises a solenoid valve (16) and controls the torque control valve (7) to gradually increase the pump torque with elapse of time from a time when the specified holding time (TX2) is passed based on a specified torque increasing rate (K).
摘要翻译：一种工程机械的发动机减速装置，包括具有第一转矩控制装置和第二转矩控制装置的车体控制器（13）和第三转矩控制装置。当处于非操作状态的操作装置（5）持续时，第一扭矩控制装置根据目标发动机转速（Nr）将转矩控制阀（7）控制到最小泵扭矩（值：Min）当处于非操作状态的操作装置被操作时，通过在指定的启动时间之后抑制发动机滞后的监视时间（TX 1），以将扭矩保持在低的泵转矩。在操作非操作状态的操作装置（5）之后，第二转矩控制装置控制转矩控制阀（7）将最小泵转矩保持在指定的保持时间（Tx 2）。第三转矩控制装置包括电磁阀（16），并且控制转矩控制阀（7），以便在从指定的保持时间（TX2）通过指定的转矩时起经过时间逐渐增加泵的转矩增加率（K）。

3. 发明授权

US08266903B2 Engine lag down suppressing device of construction machinery 有权
标题翻译：发动机落后抑制装置的施工机械
公开(公告)号：US08266903B2
公开(公告)日：2012-09-18
申请号：US10569490
申请日：2004-08-27
申请人： Yoichi Kowatari , Yasushi Arai , Kouji Ishikawa , Kazunori Nakamura , Nobuei Ariga , Hideo Karasawa , Yuuki Gotou , Motoyuki Yabuuchi
发明人： Yoichi Kowatari , Yasushi Arai , Kouji Ishikawa , Kazunori Nakamura , Nobuei Ariga , Hideo Karasawa , Yuuki Gotou , Motoyuki Yabuuchi
IPC分类号： F16D31/02
CPC分类号： F04B49/08 , E02F9/2246 , E02F9/2285 , E02F9/2296 , F04B17/05 , F15B2211/20553 , F15B2211/633 , F15B2211/6346 , F15B2211/6652 , F15B2211/851
摘要： An engine lag down control system for construction machinery has a machinery body controller having first, second and third torque control units and a solenoid valve. The first torque control unit controls a torque control valve to a minimum pump torque corresponding to a target number of engine revolutions when a non-operated state of a control device has continued beyond a monitoring time. The second torque control unit controls the torque control valve such that the above-described minimum pump torque is held for a predetermined holding time subsequent to the operation of the control device from the non-operated state. The third torque control unit controls the torque control valve such that from a time point of a lapse of the predetermined holding time, the pump torque is gradually increased on a basis of a predetermined torque increment rate.
摘要翻译：用于工程机械的发动机滞后控制系统具有具有第一，第二和第三扭矩控制单元和电磁阀的机械主体控制器。当控制装置的非操作状态持续超过监视时间时，第一扭矩控制单元将转矩控制阀控制为对应于目标发动机转数的最小泵转矩。第二扭矩控制单元控制扭矩控制阀，使得在控制装置从非操作状态的操作之后，将上述最小泵扭矩保持在预定的保持时间。第三转矩控制单元控制转矩控制阀，使得从经过预定保持时间的时间点起，泵转矩基于预定转矩增量率逐渐增加。

4. 发明申请

US20090199552A1 HYDRAULIC WORKING MACHINE 有权
标题翻译：液压工作机
公开(公告)号：US20090199552A1
公开(公告)日：2009-08-13
申请号：US12428203
申请日：2009-04-22
申请人： Toshihiro Abe , Yusuke Kajita , Kazunori Nakamura , Kouji Ishikawa , Hideo Karasawa
发明人： Toshihiro Abe , Yusuke Kajita , Kazunori Nakamura , Kouji Ishikawa , Hideo Karasawa
IPC分类号： F15B13/042
CPC分类号： F15B11/024 , E02F9/2203 , E02F9/2217 , E02F9/2235 , E02F9/2239 , E02F9/2285 , E02F9/2296 , F15B2211/20546 , F15B2211/20576 , F15B2211/3052 , F15B2211/3116 , F15B2211/3133 , F15B2211/31576 , F15B2211/31582 , F15B2211/329 , F15B2211/6313 , F15B2211/6316 , Y02P80/13
摘要： A hydraulic circuit for a hydraulic working machine is composed of a main pump 21, a boom cylinder 11 arranged for extension or contraction by pressure oil from the main pump 21, a directional control valve 22 for controlling flows of pressure oil to be fed from the main pump 21 to a bottom chamber 11a and rod chamber 12b of the boom cylinder 11, a control unit 23 for performing a change-over control of the directional control valve 22, a pilot pump 24, a jack-up selector valve 25 for controlling a flow of pressure oil delivered from the pilot pump 24, a flow control valve 26 connected on an upstream side of the directional control valve 22 to a meter-in port of the directional control valve 22 such that the flow control valve 26 can be changed over by the jack-up selector valve 25, and a center bypass selector valve 27 connected on a downstream side of the directional control valve 22 to a center bypass port of the directional control valve 22 such that the center bypass selector valve 27 can be changed over by the jack-up selector valve 25. The hydraulic circuit performs a change-over of the jack-up selector valve 25 in accordance with a bottom pressure on the boom cylinder 11.
摘要翻译：用于液压作业机的液压回路由主泵21，由主泵21的压力油而设置成伸缩的动臂缸11，用于控制从主泵21供给的压力油的流量的方向控制阀22 主泵21连接到动臂缸11的底室11a和杆室12b，用于执行方向控制阀22的转换控制的控制单元23，先导泵24，用于控制的自升式选择阀25 从先导泵24输送的压力油流，连接在方向控制阀22的上游侧的流量控制阀26到方向控制阀22的计量口，使得可以改变流量控制阀26 以及由方向控制阀22的下游侧连接到方向控制阀22的中心旁通口的中央旁通选择阀27，使得中心旁通选择阀valv e 27可以由升降选择阀25切换。液压回路根据悬臂液压缸11的底部压力进行自升式换向阀25的切换。

5. 发明授权

US08424298B2 Pump torque control system for hydraulic construction machine 有权
标题翻译：液压施工机械泵扭矩控制系统
公开(公告)号：US08424298B2
公开(公告)日：2013-04-23
申请号：US12445605
申请日：2008-01-30
申请人： Nobuei Ariga , Kouji Ishikawa , Hideo Karasawa , Yasuo Okano , Kazunori Nakamura , Youichi Kowatari
发明人： Nobuei Ariga , Kouji Ishikawa , Hideo Karasawa , Yasuo Okano , Kazunori Nakamura , Youichi Kowatari
IPC分类号： F16D31/02
CPC分类号： F15B13/0422 , E02F9/2225 , E02F9/2235 , E02F9/2282 , E02F9/2285 , E02F9/2292 , E02F9/2296 , F04B17/05 , F04B49/08 , F15B11/17 , F15B2211/20523 , F15B2211/20546 , F15B2211/20553 , F15B2211/26 , F15B2211/2656 , F15B2211/3116 , F15B2211/31576 , F15B2211/329 , F15B2211/6309 , F15B2211/633 , F15B2211/6343 , F15B2211/6652 , F15B2211/6655 , F15B2211/7053 , F15B2211/7058
摘要： A pump torque control system is capable of preventing hunting due to interference between speed sensing control and control of an engine speed of a prime mover when the temperature of a hydraulic fluid is low.A maximum absorption torque is set in a regulator 31 that controls displacement volumes of hydraulic pumps 2 and 3 based on a deviation between target and actual engine speeds of a prime mover 1. A second modification factor calculating section 45 and a control gain modifying section 49, which are included in a controller 23 that performs speed sensing control to ensure that the maximum absorption torque of the hydraulic pumps 2 and 3 is reduced, change a control gain of the speed sensing control based on a value detected by the hydraulic temperature sensor 34 to ensure that the control gain is reduced as the temperature of the hydraulic fluid is reduced.
摘要翻译：泵扭矩控制系统能够防止在液压流体的温度低时速度感测控制和原动机的发动机转速的控制之间的干扰。在基于原动机1的目标和实际发动机转速之间的偏差来控制液压泵2和3的排量的调节器31中设定最大吸收扭矩。第二修正因子计算部45和控制增益修正部49 ，其包括在执行速度感测控制以确保液压泵2和3的最大吸收扭矩减小的控制器23中，基于由液压温度传感器34检测到的值来改变速度感测控制的控制增益以确保当液压流体的温度降低时控制增益降低。

6. 发明授权

US07562615B2 Hydraulic working machine 有权
标题翻译：液压作业机
公开(公告)号：US07562615B2
公开(公告)日：2009-07-21
申请号：US10542201
申请日：2004-01-14
申请人： Toshihiro Abe , Yusuke Kajita , Kazunori Nakamura , Kouji Ishikawa , Hideo Karasawa
发明人： Toshihiro Abe , Yusuke Kajita , Kazunori Nakamura , Kouji Ishikawa , Hideo Karasawa
IPC分类号： F15B13/04
CPC分类号： F15B11/024 , E02F9/2203 , E02F9/2217 , E02F9/2235 , E02F9/2239 , E02F9/2285 , E02F9/2296 , F15B2211/20546 , F15B2211/20576 , F15B2211/3052 , F15B2211/3116 , F15B2211/3133 , F15B2211/31576 , F15B2211/31582 , F15B2211/329 , F15B2211/6313 , F15B2211/6316 , Y02P80/13
摘要： A hydraulic circuit for a hydraulic working machine is composed of a main pump 21, a boom cylinder 11 arranged for extension or contraction by pressure oil from the main pump 21, a directional control valve 22 for controlling flows of pressure oil to be fed from the main pump 21 to a bottom chamber 11a and rod chamber 12b of the boom cylinder 11, a control unit 23 for performing a change-over control of the directional control valve 22, a pilot pump 24, a jack-up selector valve 25 for controlling a flow of pressure oil delivered from the pilot pump 24, a flow control valve 26 connected on an upstream side of the directional control valve 22 to a meter-in port of the directional control valve 22 such that the flow control valve 26 can be changed over by the jack-up selector valve 25, and a center bypass selector valve 27 connected on a downstream side of the directional control valve 22 to a center bypass port of the directional control valve 22 such that the center bypass selector valve 27 can be changed over by the jack-up selector valve 25. The hydraulic circuit performs a change-over of the jack-up selector valve 25 in accordance with a bottom pressure on the boom cylinder 11.
摘要翻译：用于液压作业机的液压回路由主泵21，由主泵21的压力油而设置成伸缩的动臂缸11，用于控制从主泵21供给的压力油的流量的方向控制阀22 主泵21连接到动臂缸11的底室11a和杆室12b，用于执行方向控制阀22的转换控制的控制单元23，先导泵24，用于控制的自升式选择阀25 从先导泵24输送的压力油流，连接在方向控制阀22的上游侧的流量控制阀26到方向控制阀22的计量口，使得可以改变流量控制阀26 以及由方向控制阀22的下游侧连接到方向控制阀22的中心旁通口的中央旁通选择阀27，使得中心旁通选择阀valv e 27可以由升降选择阀25切换。液压回路根据悬臂液压缸11的底部压力进行自升式换向阀25的切换。

7. 发明授权

US07434394B2 Hydraulic drive device 有权
标题翻译：液压驱动装置
公开(公告)号：US07434394B2
公开(公告)日：2008-10-14
申请号：US10553414
申请日：2004-04-16
申请人： Kouji Ishikawa , Yusuke Kajita , Kazunori Nakamura , Genroku Sugiyama , Hideo Karasawa
发明人： Kouji Ishikawa , Yusuke Kajita , Kazunori Nakamura , Genroku Sugiyama , Hideo Karasawa
IPC分类号： F16D31/02 , F15B13/06
CPC分类号： E02F9/2235 , E02F9/2285 , E02F9/2296
摘要： To permit using hold-side pressure oil in a first hydraulic cylinder for the acceleration of a second hydraulic cylinder upon performing a combined operation of the first and second hydraulic cylinders, a hydraulic drive system is provided with a main hydraulic pump 21, a boom cylinder 6 and an arm cylinder 7, a directional control valve 23 for a boom and a directional control valve 24 for an arm, and a boom control device 25 and an arm control device 26. The hydraulic drive system is also provided with a pressure oil feed means for feeding pressure oil in a rod chamber 6b of the boom cylinder 6 to an upstream side of the directional control valve 24 for the arm when a bottom pressure of the arm cylinder 7 has increased to a high pressure equal to or higher than a predetermined pressure. This pressure oil feed means includes a flow combiner valve 44 arranged in a reservoir line 42 which can communicate to the rod chamber 6b of the boom cylinder 6. When the bottom pressure of the arm cylinder 7 is the predetermined pressure or higher, the flow combiner valve 44 maintains a communication line 40, which communicates the reservoir line 42 and the upstream side of the directional control valve 24 for the arm with each other, in a state that pressure oil can be fed to the upstream side of the directional control valve 24 for the arm.
摘要翻译：为了在执行第一和第二液压缸的组合操作时允许在第一液压缸中使用保持侧压力油来加速第二液压缸，液压驱动系统设置有主液压泵21，动臂缸悬臂气缸7，用于悬臂的方向控制阀23和用于臂的方向控制阀24，以及起重臂控制装置25和臂控制装置26。液压驱动系统还设置有压力油进给装置，用于当臂缸7的底部压力向臂的方向控制阀24的上游侧供给动臂缸6的杆室6b中的压力油时已经增加到等于或高于预定压力的高压。该压力供油装置包括设置在储存管路42中的流动组合器阀44，该储存管路42可与动臂缸6的杆室6b连通。当气缸7的底部压力为预定压力或更高压力时，组合阀44保持连通管路40，该连通管路40将储存管路42和臂的方向控制阀24的上游侧彼此连通，在压力油可以供给到用于臂的方向控制阀24的上游侧的状态下。

8. 发明申请

US20070028607A1 Hydraulic drive device 有权
标题翻译：液压驱动装置
公开(公告)号：US20070028607A1
公开(公告)日：2007-02-08
申请号：US10553414
申请日：2004-04-16
申请人： Kouji Ishikawa , Yusuke Kajita , Kazunori Nakamura , Genroku Sugiyama , Hideo Karasawa
发明人： Kouji Ishikawa , Yusuke Kajita , Kazunori Nakamura , Genroku Sugiyama , Hideo Karasawa
IPC分类号： F03C1/00
CPC分类号： E02F9/2235 , E02F9/2285 , E02F9/2296
摘要： To permit using hold-side pressure oil in a first hydraulic cylinder for the acceleration of a second hydraulic cylinder upon performing a combined operation of the first and second hydraulic cylinders, a hydraulic drive system is provided with a main hydraulic pump 21, a boom cylinder 6 and an arm cylinder 7, a directional control valve 23 for a boom and a directional control valve 24 for an arm, and a boom control device 25 and an arm control device 26. The hydraulic drive system is also provided with a pressure oil feed means for feeding pressure oil in a rod chamber 6b of the boom cylinder 6 to an upstream side of the directional control valve 24 for the arm when a bottom pressure of the arm cylinder 7 has increased to a high pressure equal to or higher than a predetermined pressure. This pressure oil feed means includes a flow combiner valve 44 arranged in a reservoir line 42 which can communicate to the rod chamber 6b of the boom cylinder 6. When the bottom pressure of the arm cylinder 7 is the predetermined pressure or higher, the flow combiner valve 44 maintains a communication line 40, which communicates the reservoir line 42 and the upstream side of the directional control valve 24 for the arm with each other, in a state that pressure oil can be fed to the upstream side of the directional control valve 24 for the arm.
摘要翻译：为了在执行第一和第二液压缸的组合操作时允许在第一液压缸中使用保持侧压力油来加速第二液压缸，液压驱动系统设置有主液压泵21，动臂缸悬臂气缸7，用于悬臂的方向控制阀23和用于臂的方向控制阀24，以及悬臂控制装置25和臂控制装置26.液压驱动系统还设有压力油进给用于当臂缸7的底部压力增加到等于或高于其的高压时将臂架缸6的杆室6b中的压力油供给到用于臂的方向控制阀24的上游侧的装置预定压力。该压力供油装置包括配置在储存管路42中的流动组合器阀44，其可与臂缸6的杆室6b连通。当臂缸7的底部压力为预定压力或更高时，组合阀44保持连通管线40，该连通管线40在压力油可以被供给到方向控制阀的上游侧的状态下将储存管路42和用于臂的方向控制阀24的上游侧彼此连通 24为手臂。

9. 发明申请

US20060162543A1 Hydraulic working machine 有权
标题翻译：液压作业机
公开(公告)号：US20060162543A1
公开(公告)日：2006-07-27
申请号：US10542201
申请日：2004-01-14
申请人： Toshihiro Abe , Yusuke Kajita , Kazunori Nakamura , Kouji Ishikawa , Hideo Karasawa
发明人： Toshihiro Abe , Yusuke Kajita , Kazunori Nakamura , Kouji Ishikawa , Hideo Karasawa
IPC分类号： F15B13/04
CPC分类号： F15B11/024 , E02F9/2203 , E02F9/2217 , E02F9/2235 , E02F9/2239 , E02F9/2285 , E02F9/2296 , F15B2211/20546 , F15B2211/20576 , F15B2211/3052 , F15B2211/3116 , F15B2211/3133 , F15B2211/31576 , F15B2211/31582 , F15B2211/329 , F15B2211/6313 , F15B2211/6316 , Y02P80/13
摘要： A hydraulic circuit for a hydraulic working machine is composed of a main pump 21, a boom cylinder 11 arranged for extension or contraction by pressure oil from the main pump 21, a directional control valve 22 for controlling flows of pressure oil to be fed from the main pump 21 to a bottom chamber 11a and rod chamber 12b of the boom cylinder 11, a control unit 23 for performing a change-over control of the directional control valve 22, a pilot pump 24, a jack-up selector valve 25 for controlling a flow of pressure oil delivered from the pilot pump 24, a flow control valve 26 connected on an upstream side of the directional control valve 22 to a meter-in port of the directional control valve 22 such that the flow control valve 26 can be changed over by the jack-up selector valve 25, and a center bypass selector valve 27 connected on a downstream side of the directional control valve 22 to a center bypass port of the directional control valve 22 such that the center bypass selector valve 27 can be changed over by the jack-up selector valve 25. The hydraulic circuit performs a change-over of the jack-up selector valve 25 in accordance with a bottom pressure on the boom cylinder 11.
摘要翻译：用于液压作业机的液压回路由主泵21，由主泵21的压力油而设置成伸缩的动臂缸11，用于控制从主泵21供给的压力油的流量的方向控制阀22 主泵21到动臂缸11的底部室11a和杆室12b，用于执行方向控制阀22的转换控制的控制单元23，先导泵24，自升式选择阀25 用于控制从先导泵24输送的压力油的流量，连接在方向控制阀22的上游侧的流量控制阀26到方向控制阀22的计量口，使得流量控制阀26可以由上升换向阀25和由方向控制阀22的下游侧连接到方向控制阀22的中心旁通口的中央旁通选择阀27进行切换，使得中心旁路塞转子阀27可以由自升式选择阀25切换。液压回路根据悬臂液压缸11的底部压力进行自升式换向阀25的切换。

10. 发明授权

US08336443B2 Hydraulic working machine 有权
标题翻译：液压作业机
公开(公告)号：US08336443B2
公开(公告)日：2012-12-25
申请号：US12428203
申请日：2009-04-22
申请人： Toshihiro Abe , Yusuke Kajita , Kazunori Nakamura , Kouji Ishikawa , Hideo Karasawa
发明人： Toshihiro Abe , Yusuke Kajita , Kazunori Nakamura , Kouji Ishikawa , Hideo Karasawa
IPC分类号： F15B11/024
CPC分类号： F15B11/024 , E02F9/2203 , E02F9/2217 , E02F9/2235 , E02F9/2239 , E02F9/2285 , E02F9/2296 , F15B2211/20546 , F15B2211/20576 , F15B2211/3052 , F15B2211/3116 , F15B2211/3133 , F15B2211/31576 , F15B2211/31582 , F15B2211/329 , F15B2211/6313 , F15B2211/6316 , Y02P80/13
摘要： A hydraulic circuit for a hydraulic working machine is composed of a main pump 21, a boom cylinder 11 arranged for extension or contraction by pressure oil from the main pump 21, a directional control valve 22 for controlling flows of pressure oil to be fed from the main pump 21 to a bottom chamber 11a and rod chamber 12b of the boom cylinder 11, a control unit 23 for performing a change-over control of the directional control valve 22, a pilot pump 24, a jack-up selector valve 25 for controlling a flow of pressure oil delivered from the pilot pump 24, a flow control valve 26 connected on an upstream side of the directional control valve 22 to a meter-in port of the directional control valve 22 such that the flow control valve 26 can be changed over by the jack-up selector valve 25, and a center bypass selector valve 27 connected on a downstream side of the directional control valve 22 to a center bypass port of the directional control valve 22 such that the center bypass selector valve 27 can be changed over by the jack-up selector valve 25. The hydraulic circuit performs a change-over of the jack-up selector valve 25 in accordance with a bottom pressure on the boom cylinder 11.
摘要翻译：用于液压作业机的液压回路由主泵21，由主泵21的压力油而设置成伸缩的动臂缸11，用于控制从主泵21供给的压力油的流量的方向控制阀22 主泵21连接到动臂缸11的底室11a和杆室12b，用于执行方向控制阀22的转换控制的控制单元23，先导泵24，用于控制的自升式选择阀25 从先导泵24输送的压力油流，连接在方向控制阀22的上游侧的流量控制阀26到方向控制阀22的计量口，使得可以改变流量控制阀26 以及由方向控制阀22的下游侧连接到方向控制阀22的中心旁通口的中央旁通选择阀27，使得中心旁通选择阀valv e 27可以由升降选择阀25切换。液压回路根据悬臂液压缸11的底部压力进行自升式换向阀25的切换。

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