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    • 2. 发明授权
    • Linear position sensor using a coaxial resonant cavity
    • 使用同轴谐振腔的线性位置传感器
    • US4737705A
    • 1988-04-12
    • US927214
    • 1986-11-05
    • Ali BitarAdam J. GudatBrian D. HugginsWesley E. JacobsonJohn F. Szentes
    • Ali BitarAdam J. GudatBrian D. HugginsWesley E. JacobsonJohn F. Szentes
    • G01B15/00F15B9/09G01D5/48G01R23/07G01R27/04H01P7/04G01N22/00
    • F15B15/2869G01D5/48G01R23/07H01P7/04
    • Known linear position sensors suffer from inaccuracies owing to severe environmental conditions, such as temperature and humidity. Physical damage to sensors exposed to rugged work conditions is a limiting factor in the expected life of sensors used, for example, in the heavy equipment industry. A pair of loop antennas mounted internal to an extensible coaxial cavity respectively transmit and receive electromagnetic signals in the radio frequency range exciting a transverse electromagnetic field in the cavity when the frequency of the signal corresponds to the resonant frequency of the cavity. The resonant frequency of the cavity is primarily dependent upon the longitudinal length of the cavity. Therefore, a voltage controlled oscillator acts under the control of a sawtooth voltage waveform of a function generator to controllably deliver a variable frequency signal to the first loop antenna. An RF detector monitors the second loop antenna for an indication that the resonant frequency has been reached. At resonance a microprocessor samples the output of the VCO and correlates the resonant frequency to the length of the coaxial cavity. The sensor is particularly suited for use in the heavy equipment industry for detecting the extended length of hydraulic cylinders as it is highly insensitive to environmental conditions and protected from the work environment.
    • 已知的线性位置传感器由于恶劣的环境条件(如温度和湿度)而受到不准确的影响。 暴露于恶劣工作条件下的传感器的物理损坏是使用传感器的预期寿命的一个限制因素,例如重型设备行业。 安装在可扩展同轴腔内部的一对环形天线分别在射频频率范围内发射和接收激励腔内的横向电磁场的电磁信号,当信号的频率对应于空腔的谐振频率时。 空腔的谐振频率主要取决于空腔的纵向长度。 因此,压控振荡器在函数发生器的锯齿波电压波形的控制下起作用,以可控地将可变频率信号传送到第一环形天线。 RF检测器监测第二环形天线以获得已经达到谐振频率的指示。 在谐振时,微处理器对VCO的输出进行采样,并将谐振频率与同轴腔的长度相关联。 传感器特别适用于重型设备行业,用于检测液压缸的延长长度,因为它对环境条件非常不敏感,并且受到工作环境的保护。
    • 5. 发明授权
    • Non-contacting multi-function sensor arrangement
    • 非接触式多功能传感器装置
    • US4369651A
    • 1983-01-25
    • US278498
    • 1981-03-03
    • John F. Szentes
    • John F. Szentes
    • F02D41/02F02P5/145G01P3/56G01M15/00
    • G01P3/56F02D41/0205F02P5/1455Y02T10/46
    • Apparatus for measuring the amount of phase shift between first and second rotating shafts (16,19) and/or the amount of limited movement of a third shaft (41) from a reference position. First and second magnetically sensible members (47,53) move through circular paths at speeds proportional to the speeds of the first and second shafts (11,12), respectively, and first and second signals (71,72) are generated by first and second magnetic sensors fixed adjacent the respective paths of the sensible members. A third signal (73) is generated by a third magnetic sensor (62), which is movable along the path of the second sensible member (53) in response to movement of the third shaft (41). Clock pulses from clock (76) are counted between successive second and first signals (72,71) and are counted between successive second and third signals (72,73) to provide digital information proportional to the phase shift between the first and second shafts (16,19) and movement of the third shaft (41). The present invention is particularly useful in engine control systems to measure timing angle advance and fuel rack movement.
    • PCT No.PCT / US81 / 00267 Sec。 371日期1981年3月3日 102(e)1981年3月3日PCT PCT。 No.W082 / 03124 PCT出版物 日期1982年9月16日。用于测量第一和第二旋转轴(16,19)之间的相移量和/或第三轴(41)与参考位置的有限运动量的装置。 第一和第二磁性构件(47,53)分别以与第一和第二轴(11,12)的速度成比例的速度移动通过圆形路径,并且第一和第二信号(71,72)分别通过第一和第二轴 第二磁传感器固定在相应构件的相应路径附近。 第三信号(73)由第三磁传感器(62)产生,第三磁传感器(62)响应于第三轴(41)的运动而可沿第二感性构件(53)的路径移动。 来自时钟(76)的时钟脉冲在连续的第二和第一信号(72,71)之间进行计数,并在连续的第二和第三信号(72,73)之间进行计数,以提供与第一和第二轴之间的相移成比例的数字信息 16,19)和第三轴(41)的运动。 本发明在发动机控制系统中特别有用,用于测量定时角提前和燃油架运动。
    • 9. 发明授权
    • Hydraulic control valve having a centering spring device
    • 液压控制阀具有定心弹簧装置
    • US5316044A
    • 1994-05-31
    • US986317
    • 1992-12-07
    • John F. SzentesDaniel E. ZimmermannDavid C. MackEric A. Hutchison
    • John F. SzentesDaniel E. ZimmermannDavid C. MackEric A. Hutchison
    • F15B13/04F15B13/044
    • F15B13/044F15B13/0402Y10T137/86622Y10T137/8671
    • Centering spring devices are useful in hydraulic control valves for returning the valve to the neutral position under both normal and abnormal operating conditions. Since the actuator moving the valve spool must work against the spring centering device, electrically actuated hydraulic valves have been limited to small sizes. The subject hydraulic control valve incorporates a centering spring device that can be controllably disabled so that the valve spool can be freely moved between the neutral and operating positions. In one embodiment, a centering spring is disabled by hydraulically moving the spring retainers toward each other to compress the spring with hydraulic fluid controlled by a solenoid valve. Maintaining the spring in a compressed condition permits the valve spool to be moved with a smaller actuator thereby making it feasible to control the valve position with an electrical actuator.
    • 定心弹簧装置可用于液压控制阀,用于在正常和异常运行条件下将阀返回到中性位置。 由于执行器移动阀芯必须抵抗弹簧定心装置,电动液压阀已经被限制在小尺寸。 本液压控制阀包括一个定心弹簧装置,该定心弹簧装置可以被可控地禁用,使得阀芯能够在空档和操作位置之间自由移动。 在一个实施例中,通过使弹簧保持器朝向彼此液压地移动以通过由电磁阀控制的液压流体来压缩弹簧而使得定心弹簧被禁用。 将弹簧保持在压缩状态允许阀芯用较小的致动器移动,从而使得可以用电致动器控制阀位置。
    • 10. 发明授权
    • Implement control system for locating a surface interface and removing a
layer of material
    • 实施用于定位表面界面的控制系统,并移除一层材料
    • US5647439A
    • 1997-07-15
    • US572136
    • 1995-12-14
    • J. Scott BurdickPaul T. CorcoranAdam J. GudatRobert A. HeroldJohn F. Szentes
    • J. Scott BurdickPaul T. CorcoranAdam J. GudatRobert A. HeroldJohn F. Szentes
    • E01C19/00E01H5/00E02F3/76
    • E01H5/00E01C19/004
    • An apparatus coupled to a work machine for assisting the work machine in removing a first layer of material from a second layer of material is provided. The work machine includes a work implement with a cutting portion. The work implement is elevationally movably connected to the work machine. The cutting portion extends in a direction transverse the longitudinal axis of the work machine. An electromagnetic unit, connected to the work machine, delivers electromagnetic radiation towards the surface, receives a reflection of the delivered electromagnetic radiation, and delivers a responsive first signal. The electromagnetic radiation penetrates the first layer of material and reflects off of the second layer of material. A controller receives the first signal, determines the distance between the electromagnetic unit and the second layer of material and responsively produces a distance signal. An implement controller receives the distance signal and responsively actuates the work implement relative to the frame.
    • 提供一种耦合到作业机器的装置,用于辅助作业机器从第二层材料中去除第一层材料。 作业机械包括具有切割部分的作业工具。 工作机具可升降地连接到作业机。 切割部分在横向于作业机器的纵向轴线的方向上延伸。 连接到作业机器的电磁单元向该表面传递电磁辐射,接收所传送的电磁辐射的反射,并传送响应的第一信号。 电磁辐射穿透第一层材料并反射出第二层材料。 控制器接收第一信号,确定电磁单元与第二层材料之间的距离,并响应地产生距离信号。 工具控制器接收距离信号并相对于框架响应地致动工作工具。