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    • 1. 发明授权
    • Automated warning time inspection at railroad grade crossings on a given track route
    • US11472451B2
    • 2022-10-18
    • US16477465
    • 2018-01-09
    • Siemens Mobility, Inc.
    • Richard Alan McGavock, Jr.
    • B61L29/32B61L23/00B61L29/30
    • An automated warning time inspection system (5) and method to test a warning time (45) at a railroad grade crossing (25) on each route for a train (30). The automated warning time inspection system (5) comprises a track circuit (12) configured to activate when a train (30) enters the track circuit (12), an event recorder (17) configured to record a first log time (35(1)) for activation of a crossing warning system (15), a camera (20) to detect a first motion detection indication (40(1)) in a motion detection zone (10) of the camera (20) if there is any motion and an island circuit (22) to detect a presence of the train (30) as the train (30) enters an island (42). The event recorder (17) to record a third log time (35(3)) for switch position indications when present. The event recorder (17) to record a fourth log time (35(4)) for activation of the island circuit (22). The camera (20) to detect a second motion detection indication (40(2)) in the motion detection zone (10) of the camera (20) after the activation of the island circuit (22) if there is any motion. The event recorder (17) to calculate and record a warning time (45) as a difference between the first log time (35(1) and the third log time (35(3)) and based on a motion detection before or after the activation of the island circuit (22) and whether the warning time (45) was more than or equal to a threshold time (50) and whether the train (30) was travelling more than or equal to a threshold speed (52) a passing or a failing of the warning time (45) inspection is logged into the event recorder (17) in a given route (55) of the train (30) travelling on the train track (7).
    • 8. 发明授权
    • Highway crossing system with improved ring sustain feature
    • 高速公路交叉系统,具有改进的环形维持功能
    • US4120471A
    • 1978-10-17
    • US808592
    • 1977-06-21
    • John H. Auer, Jr.
    • John H. Auer, Jr.
    • B61L29/28B61L29/32
    • B61L29/286
    • A highway crossing warning system includes a motion detector transmitter and receiver respectively coupled to the track rails adjacent the highway crossing for detecting motion of an approaching train. Wrap-around approach sections initiate operation of the highway crossing warning, but once motion is detected, the motion detector can serve to inhibit the highway crossing warning, after a predetermined delay, if motion indication ceases. To increase the effectiveness of the motion detection, the motion detector transmitter impresses a modulated carrier onto the track rails, wherein the modulation is phase locked to the carrier. The receiver, tuned to the carrier frequency, detects the modulation, and then determines from the level of demodulated signal whether or not approaching motion is detected. The transmitter employs solid state circuits switched between saturated and off conditions to prevent circuit component failures from masking approach motion. The ring sustain time period is arranged to provide a minimum constant warning time regardless of variations in train movement, so long as train velocity is maintained above a predetermined threshold within a predetermined distance from the crossing.
    • 公路交叉警告系统包括运动检测器发射器和接收器,其分别耦合到邻近公路十字路口的轨道轨道,用于检测接近列车的运动。 环绕方式部分启动高速公路交叉口警告的操作,但是一旦检测到运动,运动检测器可以在预定的延迟之后,如果运动指示停止,则可以阻止公路交叉警告。 为了增加运动检测的有效性,运动检测器发射器将调制的载波压印到轨道轨上,其中调制被锁相到载波。 调谐到载波频率的接收机检测调制,然后根据解调信号的电平确定是否检测到接近运动。 发射机采用在饱和和非关闭条件之间切换的固态电路,以防止电路元件故障屏蔽逼近运动。 环状维持时间周期被布置成提供最小的恒定警告时间,而不管列车运动的变化如何,只要列车速度保持在超过预定距离的交叉口的预定阈值以上。