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公开(公告)号：US4418710A
公开(公告)日：1983-12-06
申请号：US308347
申请日：1981-10-05
申请人： Oliver W. Johnson
发明人： Oliver W. Johnson
CPC分类号： F15B13/0416 , F15B11/162 , F15B11/165 , F15B13/04 , F15B2211/20538 , F15B2211/40507 , F15B2211/40515 , F15B2211/413 , F15B2211/41509 , F15B2211/41563 , F15B2211/41572 , F15B2211/41581 , F15B2211/423 , F15B2211/428 , F15B2211/45 , F15B2211/465 , Y10T137/2584 , Y10T137/2597 , Y10T137/86541
摘要： A pilot control valve (35) is provided for use in a load sensing system including a priority flow control valve (21). The pilot valve includes a flow orifice (47) through which passes flow from the priority outlet port (23) to the motor (13). The pilot valve includes a valve sleeve (73) and a relatively rotatable valve spool (75). This valving controls fluid communication between the load signal port (49) and the system reservoir and main flow path, upstream and downstream of the flow orifice. Movement of the valve spool from a minimum flow position to a maximum flow position progressively varies the load signal (51) from reservoir pressure to system pressure, thus causing the output of the priority valve (21) to progressively increase from a minimum flow to a maximum flow.
摘要翻译： 提供一个先导控制阀（35），用于包括优先流量控制阀（21）的负载感测系统。 导向阀包括流动孔（47），通过该流孔从优先出口（23）流到马达（13）。 先导阀包括阀套（73）和相对可旋转的阀芯（75）。 该阀门控制在流量孔口的上游和下游之间的负载信号端口（49）和系统储存器以及主流路之间的流体连通。 阀芯从最小流动位置到最大流动位置的运动逐渐地将负载信号（51）从储存器压力改变到系统压力，从而使得优先阀（21）的输出从最小流向逐渐增加到 最大流量。
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公开(公告)号：US4167893A
公开(公告)日：1979-09-18
申请号：US875714
申请日：1978-02-06
申请人： Oliver W. Johnson
发明人： Oliver W. Johnson
CPC分类号： B62D5/097 , Y10T137/87169
摘要： A fluid controller is disclosed of the type including a primary valve member, and a follow-up valve member. The controller includes a load signal port and a load signal chamber. Fluid is communicated from the inlet port to the load signal chamber, and the valve members define a neutral orifice communicating between the load signal chamber and the return port when the valving is in neutral. The valving defines operating orifices communicating fluid from the load signal chamber to the main fluid path, downstream of the main flow control orifice, when the valving is shifted away from neutral. The operating orifices have a smaller orifice area when the valving approaches maximum deflection. The result is a substantially higher differential operating pressure, and a higher flow rate than would otherwise be possible at that particular valve deflection.
摘要翻译： 公开了一种流体控制器，其类型包括主阀构件和随动阀构件。 控制器包括负载信号端口和负载信号室。 流体从入口端口传递到负载信号室，并且当阀门处于空档状态时，阀门部件限定了在负载信号室和返回端口之间连通的中性孔口。 当阀门偏离空档时，阀门定义了将流体从负载信号室传递到主流体路径的操作孔口，在主流量控制孔口的下游。 当阀接近最大偏转时，操作孔具有较小的孔口面积。 结果是比在该特定阀偏转处可能的更高的差动作业压力和更高的流速。
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公开(公告)号：US5019983A
公开(公告)日：1991-05-28
申请号：US313644
申请日：1989-02-21
IPC分类号： A01B69/04 , A01D41/127 , G05D1/02
CPC分类号： G05D1/0227 , A01B69/008 , A01D41/1278 , G05D1/0255 , G05D1/0257 , G05D1/024 , G05D1/0242 , G05D2201/0201
摘要： Apparatus for automatically steering a farm crop vehicle between rows of corn by sensing the locations of the rows ahead of the vehicle. The apparatus senses the location of the plants as the crop vehicle approaches them. The data thus obtained are processed by an on-board microcontroller to determine the lateral location of the crop vehicle relative to the rows and provide a feedback signal. Another feedback signal is provided by integrating that lateral error data. In addition to the plant sensors, the harvester has a Doppler radar system on its left side that provides ground-velocity information for the left side, and a similar system on the right side. The radar outputs enable the microcontroller to measure the turning of the vehicle. This is used to produce yet another feedback signal that improves the automatic steering. This turning-feedback signal stabilizes the loop. The microcontroller provides steering commands for automatically tracking the rows.
摘要翻译： 用于通过感测车辆前方的行的位置来自动地将农作物车辆转向玉米行之间的装置。 当作物车辆接近它们时，该装置感测植物的位置。 由此获得的数据由板上微控制器处理以确定作物车辆相对于行的横向位置并提供反馈信号。 通过积分该横向误差数据提供另一反馈信号。 除了植物传感器之外，收割机还在左侧具有多普勒雷达系统，为左侧提供地面速度信息，右侧还提供类似的系统。 雷达输出使微控制器能够测量车辆的转弯。 这用于产生另一个改善自动转向的反馈信号。 该转向反馈信号使环路稳定。 微控制器提供用于自动跟踪行的转向命令。
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公开(公告)号：US4109679A
公开(公告)日：1978-08-29
申请号：US761832
申请日：1977-01-24
申请人： Oliver W. Johnson
发明人： Oliver W. Johnson
CPC分类号： B62D5/097 , Y10T137/86662 , Y10T137/87169 , Y10T137/87185
摘要： A controller for fluid pressure operated devices such as power steering systems. The controller is of the type having a primary, rotatable valve member and a follow-up valve member and including a fluid meter having a metering member coupled to the follow-up valve member. The valving defines a central reference plane perpendicular to the axis of rotation of the valving, the primary valve member defining a pair of meter grooves oppositely and equally disposed about the plane. The follow-up valve defines pressure porting adjacent the plane and connected to the fluid inlet port. The primary valve member defines a pressure passage communicating with one of the meter grooves and extending a sufficient distance to communicate with the pressure porting for relative displacement of the valve members in one direction and another pressure passage communicating with the other meter groove and extending a sufficient distance to communicate with the pressure porting when the valve members are relatively displaced in the opposite direction.
摘要翻译： 用于流体压力操作装置的控制器，例如动力转向系统。 控制器是具有主要可旋转阀构件和随动阀构件的类型，并且包括具有联接到跟随阀构件的计量构件的流量计。 阀限定垂直于阀的旋转轴线的中心参考平面，主阀构件限定了围绕平面相对并均匀地布置的一对计量槽。 跟随阀定义了邻近平面并连接到流体入口的压力端口。 第一阀构件限定一个压力通道，其与一个计量槽连通并且延伸足够的距离以与压力端口连通，以使阀构件在一个方向上的相对位移和与另一个计量槽连通的另一个压力通道延伸足够的 当阀构件在相反方向上相对移位时与压力端口连通的距离。
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公开(公告)号：US4967362A
公开(公告)日：1990-10-30
申请号：US302889
申请日：1989-01-30
CPC分类号： A01B69/008 , G05D1/0227 , G05D1/0272 , G05D2201/0201
摘要： Apparatus for automatically steering a farm crop vehicle into rows of corn by sensing the locations of the rows ahead of the vehicle on both sides of the vehicle. The apparatus senses the plants of each row by means of contact sensors that touch the plants as the crop vehicle approaches them. The data thus obtained are processed by an on-board microcontroller to determine the lateral location of the crop vehicle relative to the rows. Also, the frequencies of encountering plants in laterally spaced-apart rows provided information regarding turning of the vehicle, i.e., incipient changes of lateral position. This is used to produce a further feedback signal that improves the automatic steering, especially where the rows are curved. Having the turning-feedback signal in the servo loop also permits higher loop gain without instability, which reduces tracking error even further. The microcontroller provides steering commands that automatically maintain the crop vehicle on a proper course for stripping the corn, cutting the crop, etc. The control system also provides indications for the operator of single row dropout, vehicle out of field, and field entry.
摘要翻译： 用于通过感测在车辆两侧的车辆前方的行的位置来自动地将农作物车辆转向玉米串的装置。 该装置通过接触传感器感测每一行的植物，接触传感器随着作物车辆接近植物而接触植物。 由此获得的数据由板上微控制器处理以确定作物车辆相对于行的横向位置。 此外，横向间隔开的行中遭遇植物的频率提供了关于车辆转弯的信息，即横向位置的初始变化。 这用于产生进一步改善自动转向的反馈信号，特别是在行弯曲的地方。 在伺服环路中具有转向反馈信号也允许更高的环路增益而不会不稳定，这进一步降低了跟踪误差。 微控制器提供转向命令，自动将作物车辆保持在适当的过程中，以剥离玉米，切割作物等。控制系统还为操作者提供单排辍学，车辆外场和现场进入的指示。
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公开(公告)号：US4337620A
公开(公告)日：1982-07-06
申请号：US169002
申请日：1980-07-15
申请人： Oliver W. Johnson
发明人： Oliver W. Johnson
CPC分类号： F15B11/17 , B62D5/07 , B62D5/32 , F15B2211/212 , F15B2211/30505 , F15B2211/30535 , F15B2211/30585 , F15B2211/351 , F15B2211/40515 , F15B2211/428 , F15B2211/45 , F15B2211/6054 , F15B2211/7142 , F15B2211/781 , Y10T137/2524 , Y10T137/2572
摘要： A system is disclosed for controlling the flow of fluid from a pair of pumps (15,15') to a steering system (11) and a pair of auxiliary load circuits (13,13'). The steering system includes valving (43) defining a variable flow control orifice (45), and the steering system normally operates with a pressure differential X across the variable orifice, and provides load pressure signals (47,49,49',53,53') representative of demand for fluid by the steering system. Fluid flow from the pumps is controlled by a pair of priority flow control valves (21,21') including a pair of valve members (27,27') each of which is biased by a spring (29,29') toward a position permitting flow to the steering system. The spring (29) exerts a biasing force equivalent to the pressure differential X while the spring (29') exerts a biasing force equivalent to a pressure differential Y, which is less than X. When the output of the pump (15) is unable to maintain the pressure differential X across the flow control orifice, the differential across the orifice drops to Y, at which point the valve member (27') is biased by the spring (29') to permit flow from the pump (15') to the steering system.
摘要翻译： 公开了一种用于控制从一对泵（15,15'）到转向系统（11）和一对辅助负载回路（13,13'）的流体流动的系统。 转向系统包括限定可变流量控制孔口（45）的阀门（43），并且转向系统通常在跨越可变孔口的压力差X下操作，并且提供负载压力信号（47,49,49'，53,53 '）代表了转向系统对流体的需求。 来自泵的流体流由一对优先流量控制阀（21,21'）来控制，所述优先流量控制阀包括一对阀构件（27,27'），每个阀构件被弹簧（29,29'）偏压到位置 允许流向转向系统。 弹簧（29）施加与压差X相当的偏压力，同时弹簧（29'）施加相当于小于X的压力差Y的作用力。当泵（15）的输出不能 为了保持横跨流量控制孔口的压力差X，横跨孔口的差速器下降到Y，此时阀件（27'）被弹簧（29'）偏压以允许从泵（15'）流出， 到转向系统。
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公开(公告)号：US4212229A
公开(公告)日：1980-07-15
申请号：US954519
申请日：1978-10-25
申请人： Oliver W. Johnson
发明人： Oliver W. Johnson
CPC分类号： B62D5/097 , Y10T137/87169
摘要： A controller for fluid pressure operated devices such as vehicle power steering systems. The controller is of the type having a primary, rotatable valve member and a follow-up valve member and including a fluid meter having a metering member coupled to the follow-up valve member. The valving defines a central reference plane perpendicular to the axis of rotation of the valving and the various ports and passages defined by the primary and follow-up valve members are generally oppositely and equally disposed about the central reference plane. This valving symmetry reduces internal leakage and steering wheel precession. The controller includes a load signal circuit, including a pair of load sensing grooves oppositely and equally disposed about the central plane. The valving defines various neutral orifices and operating orifices communicating with the load signal circuit resulting in different load signal levels when the valving is in neutral, when the valving is in the normal operating position, and when it is fully actuated.
摘要翻译： 用于流体压力操作装置的控制器，例如车辆动力转向系统。 控制器是具有主要可旋转阀构件和随动阀构件的类型，并且包括具有联接到跟随阀构件的计量构件的流量计。 阀限定垂直于阀的旋转轴线的中心参考平面，并且由主阀和后续阀构件限定的各个端口和通道围绕中心参考平面大体上相等地设置。 该阀对称减少内部泄漏和方向盘进动。 控制器包括一个负载信号电路，包括一对负载感测槽，该负载检测槽相对地围绕中心平面布置。 阀门定义各种中性孔口和与负载信号电路通信的操作孔，当阀门处于中立状态时，当阀门处于正常操作位置时，以及当其完全致动时，该孔口产生不同的负载信号水平。
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