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    HYDRAULIC SYSTEM PUMP CONTROL DEVICE
    3.
    发明公开
    HYDRAULIC SYSTEM PUMP CONTROL DEVICE 审中-公开

    公开(公告)号：EP2532792A4

    公开(公告)日：2018-03-28

    申请号：EP11739783

    申请日：2011-02-02

    Applicant: HITACHI CONSTRUCTION MACH CO

    Inventor： OKANO YASUO ,  NAKAMURA TSUYOSHI ,  ISHIKAWA KOUJI

    IPC: E02F9/22 ,  F15B11/00 ,  F15B11/17

    CPC classification number: E02F9/2235 ,  E02F9/2282 ,  E02F9/2285 ,  E02F9/2292 ,  E02F9/2296 ,  F15B2211/20553 ,  F15B2211/20576 ,  F15B2211/2654 ,  F15B2211/3116 ,  F15B2211/6309 ,  F15B2211/6313

    Abstract: During a swing start, a pump torque calculating section associated with pump delivery pressure 43, a pump torque calculating section associated with swing operation pressure 44, and a maximum value selecting section 45 of a controller 38 performs control to change a maximum absorption torque of a second hydraulic pump 3 between Tb and Tc in accordance with a delivery pressure of the second hydraulic pump 3. In a combined swing operation combining swing with other motion, a subtraction section 47 performs a calculation to subtract a maximum absorption torque Tp2 of the second hydraulic pump 3 from a total pump torque Tr0 and control to thereby distribute an amount of torque reduced in the second hydraulic pump 3 to a first hydraulic pump 2 associated with an actuator other than a swing motor 7. An energy loss due to relief during the swing start can thereby be reduced to improve energy efficiency. Further, a required flow rate can be supplied to the swing motor during a process of transiting to a constant speed following the swing start, thus achieving a smooth shift to a constant speed swing. Improved combined work operability and work efficiency can therefore be achieved.

    HYDROSTATISCHER ANTRIEB
    7.
    发明公开
    HYDROSTATISCHER ANTRIEB 审中-公开

    公开(公告)号：EP3194758A1

    公开(公告)日：2017-07-26

    申请号：EP15748027.8

    申请日：2015-08-04

    Applicant: Robert Bosch GmbH

    Inventor： MAST, Michael ,  HERNANDEZ LADERA, Paul Luis

    IPC: F02N7/08 ,  B60K6/12 ,  E02F9/22 ,  F15B21/14

    CPC classification number: F02N7/08 ,  B60K6/12 ,  B60K2006/126 ,  B60Y2400/46 ,  E02F9/2217 ,  E02F9/2246 ,  E02F9/226 ,  E02F9/2292 ,  E02F9/2296 ,  F15B1/033 ,  F15B11/165 ,  F15B2211/20523 ,  F15B2211/20553 ,  F15B2211/20569 ,  F15B2211/212 ,  F15B2211/4053 ,  F15B2211/411 ,  F15B2211/41509 ,  F15B2211/50518 ,  F15B2211/5157 ,  F15B2211/526 ,  F15B2211/6051 ,  F15B2211/625 ,  F15B2211/6306 ,  F15B2211/6313 ,  F15B2211/6343 ,  F15B2211/665 ,  F15B2211/6651 ,  F15B2211/6652

    Abstract: The invention relates to a hydrostatic drive, which is used in particular to start an internal combustion engine. The drive comprises a hydraulic machine, which can be adjusted in the swept volume thereof from a maximum positive swept volume to a maximum negative swept volume via a zero swept volume by means of a hydraulic adjusting device and which can be operated as a pump with positive swept volume and as a motor with negative swept volume, a high-pressure accumulator, from which the hydraulic machine can be supplied with pressure medium for operation as a motor via a pressure line, which extends between a pressure connection of the hydraulic machine and the high-pressure accumulator, an accumulator-closing valve having a first position and a second position, which is arranged in the pressure line and by means of which a fluidic connection from the high-pressure accumulator to the hydraulic machine is open in the first position and closed in the second position, and an electronic control unit, in accordance with the signals of which the accumulator-closing valve can be actuated. The problem addressed by the invention is that of designing the hydrostatic drive in such a way that the components of the hydraulic machine are not subjected to high wear and a quick return from the range of negative swept volumes occurs. This problem is solved in that, in the event of an adjustment of the hydraulic machine from a negative swept volume to a positive swept volume, the electronic control device gives a signal for switching over the accumulator-closing valve from the first position to the second position and in that the accumulator-closing valve does not switch over to the second position until there is a zero swept volume or a positive swept volume of the hydraulic machine.

    Abstract translation: 本发明涉及一种特别用于启动内燃机的静液压驱动装置。 该驱动装置包括液压机，该液压机能够借助于液压调节装置通过零扫描容积在其扫掠体积中从最大正扫波体积调节至最大负扫波体积，并且该液压机器可以作为具有正 扫气量和作为具有负扫掠容量的电动机的高压蓄能器，液压机可通过压力管线供应压力介质以作为马达操作，该压力管线在液压机器的压力接口和 具有第一位置和第二位置的蓄压器关闭阀，所述蓄压器关闭阀布置在所述压力管路中，并且借助于所述第一位置和所述第二位置，从所述高压蓄压器到所述液压机的流体连接在所述第一位置中打开 并且在第二位置关闭，并且电子控制单元根据可以致动蓄能器关闭阀的信号。 本发明解决的问题在于设计静液压驱动装置，使得液压机的部件不经受高磨损，并且发生负扫掠体积范围的快速返回。 该问题通过以下方式解决，即，在液压机从负排量到正排量的调节中，电子控制装置给出用于将蓄能器关闭阀从第一位置切换到第二位置的信号 并且蓄压器关闭阀不切换到第二位置，直到液压机器的零扫气量或正扫气量为止。

    COMPACT WHEEL LOADER
    10.
    发明公开
    COMPACT WHEEL LOADER 有权
    KOMPAKTER RADLADER

    公开(公告)号：EP3114373A1

    公开(公告)日：2017-01-11

    申请号：EP15707614.2

    申请日：2015-03-02

    Applicant: CNH Industrial Italia S.p.A.

    Inventor： FERRACIN, Paolo ,  GARRAMONE, Adriano ,  GRAVILI, Andrea ,  NEGRI, Gianpiero ,  RAZETTO, Giuseppina ,  READ, Michael ,  CIARROCCHI, Marco Pietro

    IPC: F16H61/433

    CPC classification number: E02F9/2253 ,  B60W2300/17 ,  E02F3/34 ,  E02F9/2058 ,  E02F9/2285 ,  E02F9/2292 ,  E02F9/2296 ,  F15B11/08 ,  F15B2211/20523 ,  F15B2211/20553 ,  F15B2211/575 ,  F16H61/433

    Abstract: A compact wheel loader having a hydrostatic transmission and two modes of operation. In a normal mode, a demand lever is used to set the engine speed, and displacement of the swash plate of the hydraulic pump of the transmission is set by a hydraulic pilot pressure (Ps) that increases with engine speed, so that the transmission ratio automatically decreases as the engine speed increased. In a creeper mode, the engine is set to operate at a high speed to meet the demand of powered implements of the loader, and the wheel speed is controlled by the demand lever setting the transmission ratio by varying the hydraulic pilot pressure (Ps).

    Abstract translation: 具有静液压传动和两种操作模式的紧凑型轮式装载机。 在正常模式中，使用需求杆来设定发动机转速，并且通过随着发动机转速而增加的液压先导压力（Ps）来设定变速器的液压泵的斜板的位移，使得变速比 随着发动机转速的增加自动减小。 在爬行模式中，发动机被设定为高速运转以满足装载机的动力装置的需求，并且通过改变液压先导压力（Ps）的需求杆来控制车轮速度来设定传动比。

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