公开(公告)号：US4737705A

公开(公告)日：1988-04-12

申请号：US927214

申请日：1986-11-05

申请人： Ali Bitar ,  Adam J. Gudat ,  Brian D. Huggins ,  Wesley E. Jacobson ,  John F. Szentes

发明人： Ali Bitar ,  Adam J. Gudat ,  Brian D. Huggins ,  Wesley E. Jacobson ,  John F. Szentes

IPC分类号： G01B15/00 ,  F15B9/09 ,  G01D5/48 ,  G01R23/07 ,  G01R27/04 ,  H01P7/04 ,  G01N22/00

CPC分类号： F15B15/2869 ,  G01D5/48 ,  G01R23/07 ,  H01P7/04

摘要： 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.

摘要翻译： 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。

公开(公告)号：US07260930B2

公开(公告)日：2007-08-28

申请号：US11393681

申请日：2006-03-31

申请人： Mark T. Decou ,  Andrew A. Knitt ,  Matthew D. Fike ,  Brian D. Huggins ,  Frank B. Walton

发明人： Mark T. Decou ,  Andrew A. Knitt ,  Matthew D. Fike ,  Brian D. Huggins ,  Frank B. Walton

IPC分类号： F01N3/00

CPC分类号： F01N9/002 ,  F01N11/00 ,  F01N2330/06 ,  F01N2550/04 ,  F01N2560/05 ,  F01N2560/12 ,  G01N15/0618 ,  G01N22/00 ,  Y02T10/47

摘要： A particulate trap regeneration system is provided, which may include a particulate trap having a filter medium configured to remove one or more types of particulate matter from an exhaust flow of an engine and a regeneration device configured to reduce an amount of particulate matter in the particulate trap, as well as a radio frequency-based particulate loading monitoring system configured to determine an amount of particulate matter trapped by the filter medium. The particulate loading monitoring system may include at least one radio frequency transmitting probe configured to transmit radio frequency signals of predetermined magnitude and predetermined frequency toward the filter medium and at least one radio frequency receiving probe configured to receive and measure the magnitude of received radio frequency signals that pass through the filter medium. Further, the system may include a temperature sensing device configured to take a temperature measurement indicative of a temperature of the particulate trap at the time the radio signals are received by the receiving probe and a controller, which may be configured to determine, based on the measured magnitude of received radio frequency signals, a particulate loading value indicative of the amount of particulate matter trapped in the filter medium. The controller may also be configured to perform a temperature compensation including modifying, based on the temperature measurement, at least one of the following: the measured magnitude of the received radio frequency signals that pass through the filter medium or the particulate loading value.

摘要翻译： 提供了一种颗粒捕集器再生系统，其可以包括具有过滤介质的颗粒捕集器，所述过滤介质构造成从发动机的排气流中除去一种或多种类型的颗粒物质;以及再生装置，其被配置为减少颗粒物中的颗粒物质的量 捕集器，以及配置成确定由过滤介质捕获的颗粒物质的量的基于射频的颗粒物负载监测系统。 颗粒物装载监测系统可以包括至少一个射频发射探头，其被配置为向滤波器介质传输预定幅度和预定频率的射频信号，以及至少一个射频接收探针，被配置为接收和测量所接收的射频信号的幅度 通过过滤介质。 此外，系统可以包括温度感测装置，其被配置为在接收探头和控制器接收到无线电信号时采取指示微粒捕获器的温度的温度测量，所述控制器可以被配置为基于 接收的射频信号的测量幅度，指示被捕获在过滤介质中的颗粒物质的量的颗粒负载值。 控制器还可以被配置为执行温度补偿，包括基于温度测量来修改以下中的至少一个：通过过滤介质的接收到的射频信号的测量幅度或颗粒负载值。