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    • 4. 发明申请
    • HYDRAULIC SYSTEM FOR AN ALL-WHEEL DRIVE SYSTEM AND METHOD OF CONTROLLING SAID HYDRAULIC SYSTEM
    • 全轮驱动系统液压系统及控制液压系统的方法
    • WO2008003352A1
    • 2008-01-10
    • PCT/EP2006/063890
    • 2006-07-05
    • HALDEX TRACTION ABDAVIDSSON, Per-Olof
    • DAVIDSSON, Per-Olof
    • B60K23/08B60K17/34
    • F16D48/066F16D2500/10431F16D2500/3028F16D2500/5108F16D2500/511
    • The present invention relates to a method of controlling a hydraulic system (100) for an all-wheel drive system, said hydraulic system comprising an electric hydraulic pump (110), a control valve (140) for directing hydraulic fluid to a load, and an accumulator (150) in fluid communication with the pump (110) and the valve (140). The method comprises the steps of estimating a negative hydraulic-fluid leakage flow out of the accumulator (150), such as through the valve (140) and the pump (110), using a predetermined model, estimating a negative hydraulic-fluid work flow through the valve (140), by studying the control signal from an ECU (170) to the control valve (140) and using a predetermined model, and estimating a first positive fluid flow from the pump (110) into the accumulator (150), from a control signal from the ECU (170). The above estimated negative hydraulic-fluid leakage flow, negative hydraulic-fluid work flow and positive fluid flow are added to a total flow communicating with the accumulator (150), and a value is obtained of the volume of the hydraulic fluid in the accumulator (150) from said total flow communicating with the accumulator (150) for controlling an operation mode of said pump (110). The invention also relates to a computer-readable medium for holding a computer program for carrying out the above method, and also a hydraulic system for performing the method.
    • 本发明涉及一种控制全轮驱动系统的液压系统(100)的方法,所述液压系统包括电动液压泵(110),用于将液压流体引导到负载的控制阀(140),以及 与泵(110)和阀(140)流体连通的蓄能器(150)。 该方法包括以下步骤:使用预定模型,例如通过阀(140)和泵(110)估计蓄能器(150)中的负的液压 - 液体泄漏流量,估计负的液压流体工作流量 通过研究从ECU(170)到控制阀(140)的控制信号并使用预定的模型,并估计从泵(110)进入蓄能器(150)的第一正的流体流量,通过阀(140) 来自ECU(170)的控制信号。 将上述估计的负液压流体泄漏流量,负液压流体工作流量和正流体流量加到与蓄能器(150)连通的总流量中,并且获得蓄能器中的液压流体的体积 150),用于控制所述泵(110)的操作模式。 本发明还涉及一种用于保持用于执行上述方法的计算机程序的计算机可读介质,以及用于执行该方法的液压系统。
    • 5. 发明申请
    • ACCUMULATOR
    • 累加器
    • WO2007104592A1
    • 2007-09-20
    • PCT/EP2007/050565
    • 2007-01-19
    • HALDEX TRACTION ABDAVIDSSON, Per-Olof
    • DAVIDSSON, Per-Olof
    • F15B1/24
    • F15B1/021F15B1/04F15B21/044F15B2201/21F15B2201/31F15B2201/4053F15B2201/411F15B2201/413
    • An accumulator (100) for a hydraulic system, wherein the accumulator (100) comprises a liner (110), a piston (140) and a housing (200), that defines a pressure chamber (PC), for receiving hydraulic fluid at high pressure, wherein the piston (140) is biased towards an end position of the pressure chamber (PC) for interacting with the hydraulic fluid in the pressure chamber (PC), and the piston (140) is movable in a predetermined range for accumulating hydraulic fluid. The accumulator has at least one outlet port (111) in a sidewall (112) of the liner (110), which outlet port (111) is covered by the piston (140) in the predetermined range and is uncovered when the piston (140) has moved a predetermined distance from the end position. A hydraulic system is also provided that comprises the above accumulator and an all-wheel drive system comprising the above hydraulic system. A method for de-airing an accumulator according to above is also provided.
    • 一种用于液压系统的蓄能器(100),其中所述蓄能器(100)包括限定压力室(PC)的衬套(110),活塞(140)和壳体(200),用于在高压下接收液压流体 压力,其中所述活塞(140)被朝向所述压力室(PC)的端部位置偏压以与所述压力室(PC)中的所述液压流体相互作用,并且所述活塞(140)可在预定范围内移动以累积液压 流体。 蓄能器在衬套(110)的侧壁(112)中具有至少一个出口端口(111),该出口端口(111)被活塞(140)覆盖在预定范围内,并且当活塞(140) )已经从结束位置移动了预定的距离。 还提供一种液压系统,其包括上述蓄能器和包括上述液压系统的全轮驱动系统。 还提供了一种根据上述的放电器的放电方法。