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1. 发明申请

US20050211936A1 Electrohydraulic valve servomechanism with adaptive resistance estimator 失效
标题翻译：电液阀伺服机构与自适应电阻估计器
公开(公告)号：US20050211936A1
公开(公告)日：2005-09-29
申请号：US11083585
申请日：2005-03-18
申请人： Keith Tabor , Joseph Pfaff
发明人： Keith Tabor , Joseph Pfaff
IPC分类号： F15B11/04 , E02F9/22 , F15B11/00 , F15B19/00 , F15B21/08 , F16K31/02 , F16K37/00 , G05D7/06
CPC分类号： E02F9/22 , F15B11/006 , F15B19/00 , F15B21/087 , F15B2211/30575 , F15B2211/328 , F15B2211/875 , F16K37/0083
摘要： A servomechanism includes a controller which dynamically estimates the resistance of the solenoid coil in an electrohydraulic valve as part of determining a level of electric voltage to apply to open the valve. The servomechanism receives a current setpoint designating a desired electric current level and senses the actual level of current flowing through the coil. A proportional term is derived from the current setpoint and the actual level of current. Creation of a derivative term is based on the difference between the current setpoint and the actual level of current. A feedforward term is produced by estimating the resistance of the electrohydraulic valve and limiting the feedforward term to a predefined range of acceptable values. The proportional term, derivative term, and the feedforward term are summed to define a desired voltage level, and a PWM signal for driving the electrohydraulic valve is generated based on the desired voltage level.
摘要翻译：伺服机构包括控制器，该控制器动态地估计电动液压阀中的螺线管线圈的阻力，作为确定用于打开阀门的电压水平的一部分。伺服机构接收指定所需电流水平的电流设定点，并感测流过线圈的电流的实际电平。从当前设定值和电流的实际电平得出比例项。衍生项的创建是基于当前设定值与实际电流水平之差。通过估计电动液压阀的阻力并将前馈项限制在预定范围的可接受值来产生前馈项。将比例项，微分项和前馈项相加以确定期望的电压电平，并且基于期望的电压电平产生用于驱动电动液压阀的PWM信号。

2. 发明申请

US20050211312A1 Hydraulic system control method using a differential pressure compensated flow coefficient 失效
标题翻译：液压系统控制方法采用差压补偿流量系数
公开(公告)号：US20050211312A1
公开(公告)日：2005-09-29
申请号：US11089482
申请日：2005-03-24
申请人： Joseph Pfaff , Keith Tabor
发明人： Joseph Pfaff , Keith Tabor
IPC分类号： F15B11/028 , F15B11/00 , F15B13/04 , F15B13/044 , F15B21/02 , F15B21/08
CPC分类号： F15B21/02 , F15B11/006 , F15B21/087 , F15B2211/30575 , F15B2211/426 , F15B2211/455 , F15B2211/6306 , F15B2211/6654 , F15B2211/7053 , F15B2211/75 , Y10T137/87217
摘要： A hydraulic system has an electrohydraulic valve that controls flow of fluid to operate a hydraulic actuator, such as a cylinder or motor. A set of characterization data is provided which describes performance of the electrohydraulic valve as a function of changes in differential pressure across that valve. The hydraulic system is operated by specifying desired movement of the hydraulic actuator and in response deriving a desired valve flow coefficient which designates a level of fluid flow through the electrohydraulic valve. A compensated control signal is produced from the desired valve flow coefficient and the characterization data, to counter act effects that changes in differential pressure have on flow of fluid. The electrohydraulic valve is activated in response to the compensated control signal.
摘要翻译：液压系统具有电液阀，其控制流体的流动以操作液压致动器，例如气缸或马达。提供了一组表征数据，其描述了电液阀的性能作为该阀上的压差变化的函数。通过指定液压致动器的所需运动来操作液压系统，并且响应于导出指定通过电动液压阀的流体水平的期望的阀流量系数。从期望的阀流量系数和特征数据产生补偿控制信号，以抵消差压变化对流体流动的影响。电液阀响应于补偿的控制信号被激活。

3. 发明申请

US20070209503A1 Hydraulic system with mechanism for relieving pressure trapped in an actuator 失效
标题翻译：液压系统，具有释放执行器压力的机构
公开(公告)号：US20070209503A1
公开(公告)日：2007-09-13
申请号：US11373892
申请日：2006-03-13
申请人： Joseph Pfaff , Keith Tabor
发明人： Joseph Pfaff , Keith Tabor
IPC分类号： F15B11/10
CPC分类号： F15B11/006 , F15B2211/20538 , F15B2211/30575 , F15B2211/3111 , F15B2211/3144 , F15B2211/31576 , F15B2211/327 , F15B2211/45 , F15B2211/6306 , F15B2211/6309 , F15B2211/6313 , F15B2211/6346 , F15B2211/6653 , F15B2211/7053 , F15B2211/88
摘要： Pressure trapped in an inactive hydraulic actuator can result in the actuator moving in a direction which is opposite to that desired upon subsequent activation. The present method detects a trapped pressure condition and takes remedial action before activating the hydraulic actuator for motion. The pressure differentials across valves that control the fluid flow to and from the hydraulic actuator are used to detect a trapped pressure condition. In response to that detection, a selected valve is initially opened in a manner that releases the trapped pressure while producing motion in the desired direction. After the trapped pressure condition has been resolved, one or more other valves are operated to produce the desired motion of the hydraulic actuator.
摘要翻译：被捕获在非活动液压执行器中的压力可导致致动器在随后激活时与所需的方向相反的方向移动。本方法检测被捕获的压力状况，并在启动液压致动器进行运动之前采取补救措施。用于控制流入和流出液压致动器的流体的阀门之间的压力差用于检测被捕获的压力状况。响应于该检测，选择的阀最初以释放被捕获的压力同时在所需方向产生运动的方式打开。在捕获的压力条件已经解决之后，一个或多个其他阀被操作以产生液压致动器的期望的运动。

4. 发明申请

US20070157980A1 Pilot operated control valve having a two stage poppet 审中-公开
标题翻译：先导控制阀具有两级提升阀
公开(公告)号：US20070157980A1
公开(公告)日：2007-07-12
申请号：US11329664
申请日：2006-01-11
申请人： Dwight Stephenson , Gennady Shimelfarb , Joseph Pfaff
发明人： Dwight Stephenson , Gennady Shimelfarb , Joseph Pfaff
IPC分类号： F15B13/043
CPC分类号： F15B13/0405 , F15B13/0431 , Y10T137/86614
摘要： A hydraulic valve has a main poppet that engages and disengages a valve seat to control the flow of fluid between an inlet and an outlet. Movement of the main poppet is governed by a pilot valve element the opens and closes a pilot passage in the main poppet. The pilot valve element is slideably received in a bore in an armature. The armature is biased toward the main poppet by a first spring and a second spring biases the pilot valve element outward from armature bore and toward the main poppet. The second spring has a lesser spring rate than the first spring. Upon engagement of the pilot valve element with the main poppet continued application of the engaging force causes the second spring to collapse and the pilot valve element to slide within the armature, thereby absorbing some of the force that could otherwise adversely affect the valve.
摘要翻译：液压阀具有与阀座接合和分离以控制入口和出口之间的流体流动的主提升阀。主提升阀的运动由先导阀元件控制，该主阀提供阀在主阀座中打开和关闭一个引导通道。先导阀元件可滑动地容纳在电枢的孔中。电枢通过第一弹簧偏压到主提升阀座，第二弹簧将导阀元件从电枢孔向外偏压到主提升阀。第二弹簧的弹簧弹簧比第一弹簧小。在先导阀元件与主提升阀接合时，接合力的继续施加导致第二弹簧塌陷，并且先导阀元件在衔铁内滑动，从而吸收一些否则会不利地影响阀的力。

5. 发明申请

US20070130927A1 Apparatus for controlling deceleration of hydraulically powered equipment 有权
公开(公告)号：US20070130927A1
公开(公告)日：2007-06-14
申请号：US11299926
申请日：2005-12-12
申请人： Joseph Pfaff
发明人： Joseph Pfaff
IPC分类号： F16D31/00
CPC分类号： E02F9/2207
摘要： A machine member driven by a hydraulic actuator may oscillate, or wag, when the hydraulic actuator decelerates or stops. The degree of oscillation is a function of the machine member's ability to track a deceleration command, which ability varies with changes in the position of the machine member and the load force acting thereon. To reduce the oscillation, a command that controls operation of the hydraulic actuator is filtered using a filter function that changes with the machine member's load. The load force exerted on the hydraulic actuator which in turn can be designated by fluid pressure that results from the hydraulic actuator. Preferably, the frequency of the filter function is varied inversely with the magnitude of the actuator load force.

6. 发明申请

US20060185354A1 Priority communication protocol for a distributed electrohydraulic system having multiple controllers 有权
标题翻译：具有多个控制器的分布式电动液压系统的优先通信协议
公开(公告)号：US20060185354A1
公开(公告)日：2006-08-24
申请号：US11406651
申请日：2006-04-19
申请人： Joseph Pfaff
发明人： Joseph Pfaff
IPC分类号： F16D31/00
CPC分类号： E02F9/226 , E02F3/435
摘要： A distributed hydraulic system having a plurality of hydraulic functions each including a hydraulic actuator, a valve assembly that controls flow of fluid to the hydraulic actuator, and a function controller which operates the valve assembly. The function controllers exchange messages over a communication network which has a finite bandwidth. Access to the network is controlled by determining which function controllers govern high priority operations and allowing those function controllers to send messages as often as once every first interval of time. The other function controllers are limited to sending messages no more often than once every second interval of time, which is longer than the first interval of time.
摘要翻译：一种具有多个液压功能的分布式液压系统，每个液压功能包括液压致动器，控制流体流向液压致动器的阀组件以及操作阀组件的功能控制器。功能控制器通过具有有限带宽的通信网络交换消息。通过确定哪些功能控制器控制高优先级操作并允许这些功能控制器经常每隔一段时间发送消息来控制对网络的访问。其他功能控制器限于每隔一段时间发送消息不止一次，这比第一个时间间隔长。

7. 发明申请

US20050210713A1 Automatic hydraulic load leveling system for a work vehicle 有权
标题翻译：用于工作车辆的自动液压负载调平系统
公开(公告)号：US20050210713A1
公开(公告)日：2005-09-29
申请号：US10811401
申请日：2004-03-26
申请人： Kenneth Mennen , Joseph Pfaff
发明人： Kenneth Mennen , Joseph Pfaff
IPC分类号： B66F9/00 , B66F9/065 , B66F9/22 , E02F1/00 , E02F3/43 , E02F9/22
CPC分类号： B25J9/1628 , B66F9/0655 , B66F9/22 , E02F3/432 , G05B2219/39217 , G05B2219/41273 , G05B2219/45017 , G05B2219/45049
摘要： A machine has a boom, that is pivotally raised and lowered by a first cylinder, and has a load carrier that is pivoted at the end of the boom by a second cylinder. As a machine operator commands movement of the boom, the position of the load carrier is automatically altered by a controller to prevent a load from falling off the load carrier. The load carrier position with respect to the boom is altered in response to the amount of boom motion to maintain a constant position relationship between the load carrier and a chassis of the machine. Although the boom and load carrier move through different angular positions, the machine control is expressed in terms of the linear motion of the first and second cylinders.
摘要翻译：机器具有通过第一气缸枢转地升高和降低的起重臂，并且具有通过第二气缸在悬臂的端部枢转的负载托架。当机器操作员指令动臂的运动时，负载架的位置由控制器自动改变，以防止负载从负载架上脱落。相对于起重臂的载重承载位置响应于起重臂运动的量而改变，以保持负载托架和机器的底盘之间的恒定的位置关系。尽管动臂和负载架移动通过不同的角度位置，机器控制是以第一和第二气缸的直线运动来表示的。

8. 发明申请

US20070227136A1 Hydraulic metering mode transitioning technique for a velocity based control system 有权
标题翻译：基于速度的控制系统的液压计量模式转换技术
公开(公告)号：US20070227136A1
公开(公告)日：2007-10-04
申请号：US11397363
申请日：2006-04-04
申请人： Joseph Pfaff
发明人： Joseph Pfaff
IPC分类号： F16D31/02
CPC分类号： F15B11/006 , F15B11/024 , F15B21/082 , F15B21/085 , F15B21/14 , F15B2211/30575 , F15B2211/6309 , F15B2211/6313 , F15B2211/6346 , F15B2211/7053 , F15B2211/88
摘要： The flow of fluid to a hydraulic actuator is controlled by a valve assembly which operates in different metering modes at various points in time for energy conservation. The metering mode to use is selected in response to the hydraulic load acting on the hydraulic actuator. Specifically, the present magnitude of hydraulic load is determined and compared to first and second thresholds. Below the first threshold only a first metering mode is activated, and only a second metering mode is activated above the second threshold. A combination of the first and second metering modes is utilized when the hydraulic load is between those thresholds, wherein the metering modes are used in proportion to a proportional relationship of the hydraulic load to the first and second thresholds. Using a metering mode combination in this manner smoothes transitions between the first and second metering modes.
摘要翻译：流体到液压致动器的流动由阀组件控制，该阀组件在不同的时间点以不同的计量模式工作以进行节能。响应于作用在液压执行器上的液压负载来选择使用的测量模式。具体地说，确定目前的液压载荷大小并将其与第一和第二阈值进行比较。在第一阈值之下，仅激活第一测光模式，并且仅在第二阈值以上激活第二测光模式。当液压负载在这些阈值之间时，利用第一和第二计量模式的组合，其中计量模式与液压负载与第一和第二阈值的比例关系成比例地使用。以这种方式使用测光模式组合平滑了第一和第二测光模式之间的转换。

9. 发明申请

US20060191262A1 HYDRAULIC CONTROL VALVE SYSTEM WITH ELECTRONIC LOAD SENSE CONTROL 失效
标题翻译：具有电子负载感应控制的液压控制阀系统
公开(公告)号：US20060191262A1
公开(公告)日：2006-08-31
申请号：US11068229
申请日：2005-02-28
申请人： Randall Jackson , Richard Clanton , Joseph Pfaff
发明人： Randall Jackson , Richard Clanton , Joseph Pfaff
IPC分类号： F16D31/02
CPC分类号： G05D16/208 , F15B11/165 , F15B21/08 , F15B2211/20538 , F15B2211/20553 , F15B2211/253 , F15B2211/50536 , F15B2211/5753 , F15B2211/63 , F15B2211/6309 , F15B2211/6313 , F15B2211/6652 , F15B2211/6656 , F15B2211/71 , F15B2211/78
摘要： An apparatus is provided which has sensors that detect pressure on opposite sides of a control valve which controls the flow of hydraulic fluid from a source to a hydraulic actuator. The sensors produce electrical signals indicating those pressures. In response to the sensor signals, a controller produces an output signal the operates a proportional control valve to thereby regulate pressure at a node of the hydraulic circuit. Several mechanisms are described that react to the pressure at the node by varying the pressure of the fluid being supplied to the main valve so that a controlled pressure level is achieved.
摘要翻译：提供了一种装置，其具有检测控制阀的相对侧上的压力的传感器，该控制阀控制液压流体从源到液压致动器的流动。传感器产生指示这些压力的电信号。响应于传感器信号，控制器产生输出信号，操作比例控制阀，从而调节液压回路节点处的压力。描述了通过改变被供应到主阀的流体的压力来响应于节点处的压力的几个机构，使得实现了受控的压力水平。

10. 发明申请

US20060086088A1 Communication protocol for a distributed electrohydraulic system having multiple controllers 有权
标题翻译：具有多个控制器的分布式电动液压系统的通讯协议
公开(公告)号：US20060086088A1
公开(公告)日：2006-04-27
申请号：US10972853
申请日：2004-10-25
申请人： Joseph Pfaff
发明人： Joseph Pfaff
IPC分类号： F16D31/02
CPC分类号： E02F9/226 , E02F3/435
摘要： A distributed hydraulic system having a plurality of hydraulic functions each including a hydraulic actuator, a valve assembly that controls flow of fluid to the hydraulic actuator, and a function controller which operates the valve assembly. The function controllers exchange messages over a communication network which has a finite bandwidth. Access to the network is controlled by determining which function controllers govern high priority operations and allowing those function controllers to send messages as often as once every first interval of time. The other function controllers are limited to sending messages no more often than once every second interval of time, which is longer than the first interval of time.
摘要翻译：一种具有多个液压功能的分布式液压系统，每个液压功能包括液压致动器，控制流体流向液压致动器的阀组件以及操作阀组件的功能控制器。功能控制器通过具有有限带宽的通信网络交换消息。通过确定哪些功能控制器控制高优先级操作并允许这些功能控制器经常每隔一段时间发送消息来控制对网络的访问。其他功能控制器限于每隔一段时间发送消息不止一次，这比第一个时间间隔长。

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