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公开(公告)号：US6087964A
公开(公告)日：2000-07-11
申请号：US847777
申请日：1997-04-24
CPC分类号： G08G1/042
摘要： A programmable vehicle detector with operator actuatable function selection and parameter value setting keys, and an operational display. A small cluster (four) of key switches enables an operator to select programmable vehicle detector functions, such as pulse/presence, scanning/non-scanning, end of green control; and also adjust the value of settable parameters, such as loop frequency, sensitivity, delay time, and maximum presence time. The value of certain parameters is displayed, either by manual interrogation by operation of the switches during a set mode or automatically during normal operation. During normal operation, the display also indicates dynamically the relative value of the loop inductance, using a unique bar graph, the generation of Call a signal, and the time remaining in a delay time period and a maximum presence time period. The display further indicates which of several channels has been selected for function and parameter programming, or is currently being monitored for operation. The vehicle detector can be operated as both a scanning multi-channel detector or a non-scanning multi-channel detector.
摘要翻译： 具有操作员可启动功能选择和参数值设定键的可编程车辆检测器，以及操作显示。 一个小型集群（四个）的钥匙开关使操作员可以选择可编程的车辆检测器功能，如脉冲/存在，扫描/非扫描，绿色控制结束; 并调整可设定参数的值，如循环频率，灵敏度，延迟时间和最大存在时间。 通过在设定模式期间通过操作开关进行手动询问或在正常操作期间自动显示某些参数的值。 在正常操作期间，显示器还使用唯一的条形图动态地指示环路电感的相对值，产生呼叫信号，以及在延迟时间段和最大存在时间段内剩余的时间。 显示进一步指示为功能和参数编程选择了几个通道中的哪一个，或正在监视操作。 车辆检测器可以作为扫描多通道检测器或非扫描多通道检测器来操作。
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公开(公告)号：US5936551A
公开(公告)日：1999-08-10
申请号：US832214
申请日：1997-04-03
CPC分类号： G08G1/042
摘要： A vehicle detector with improved reference tracking routines in both the Call direction and the No Call direction. Call direction tracking includes rate sensitive tracking in which the reference is only changed in response to small fluctuations in loop frequency due to drift, and one or more fixed decrementing tracking intervals during which the reference is decremented at a fixed rate for a maximum predetermined period of time. Call direction tracking also includes infinite tracking during which the reference is decremented to an end value representative of loop inductance prior to the generation of a call signal. No Call tracking permits reference updating only after the loop frequency has stabilized for a minimum period of time, a minimum number of loop frequency samples or both.
摘要翻译： 一种车辆检测器，其具有在呼叫方向和无呼叫方向上改进的参考跟踪程序。 呼叫方向跟踪包括速率敏感跟踪，其中参考仅响应于由于漂移引起的环路频率的小波动而变化，以及一个或多个固定递减跟踪间隔，在此期间参考以固定速率递减最大预定周期 时间。 呼叫方向跟踪还包括无限跟踪，在此期间，在生成呼叫信号之前，参考值减小到代表回路电感的终端值。 无呼叫跟踪仅在环路频率稳定最短时间后，循环频率采样的最小数量或两者都允许参考更新。
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公开(公告)号：US08842023B2
公开(公告)日：2014-09-23
申请号：US13385035
申请日：2012-01-30
摘要： A vehicle detector capable of detecting motorized vehicles, bicycles only or both types of vehicle in a loop near a controlled intersection. The vehicle detector includes a processor under control of machine readable code for controlling the operation of one or more oscillators coupled to one or more loops. Manually actuatable switches enable the entry of mode settings—i.e., motorized vehicle and bicycle detect or bicycle only detect—and clearance time parameters for ensuring that one or more bicycles can safely proceed through an intersection when given a green light. Selection of the Bicycle detect mode is denoted by the entry of a non-zero value in an initial timer using one or more of the switches.
摘要翻译： 一种车辆检测器，其能够在受控交叉口附近的环路中检测机动车辆，仅自行车或两种类型的车辆。 车辆检测器包括处理器，其由机器可读代码控制，用于控制耦合到一个或多个回路的一个或多个振荡器的操作。 手动启动开关能够进入模式设置，即，机动车辆和自行车检测或自行车只能检测和清除时间参数，以确保一个或多个自行车在给予绿灯时可以安全地通过十字路口。 自行车检测模式的选择由使用一个或多个开关的初始定时器中的非零值的输入来表示。
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公开(公告)号：US06281809B1
公开(公告)日：2001-08-28
申请号：US09523917
申请日：2000-03-09
IPC分类号： G08G101
CPC分类号： G08G1/042
摘要： A method and apparatus for visually and audibly verifying Call signal generation in a vehicle detector. A generated Call signal drives a visible display, such as a discrete LED, an LED display composed of multiple discrete LEDs, or an LCD display. The same generated Call signal also controls the operation of an audible tone generator so that an audible tone is generated whenever the vehicle detector generates a Call signal. The audible tone generation permits a single technician in the field to check the vehicle detector for correct Call signal generation in response to vehicle movement in the vicinity of the associated detector loop
摘要翻译： 一种用于视觉和可听地验证车辆检测器中的呼叫信号产生的方法和装置。 生成的呼叫信号驱动可见显示器，例如分立LED，由多个分立LED组成的LED显示器或LCD显示器。 相同的生成的呼叫信号还控制可听音发生器的操作，使得每当车辆检测器产生呼叫信号时产生可听见的音调。 声音产生允许现场的单个技术人员检查车辆检测器以响应于相关联的检测器环路附近的车辆运动产生正确的呼叫信号
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公开(公告)号：US08374573B1
公开(公告)日：2013-02-12
申请号：US12383872
申请日：2009-03-30
IPC分类号： H05K11/02
摘要： An automatic vehicle identification (AVI) system signal processing technique which provides improved performance and reliability and which substantially eliminates the adverse effect of ambient noise signals on the detection of permissible code sequences by an AVI receiver. Input signals to an AVI receiver are filtered to strip off all frequency components except those at the carrier frequency. The filtered signals are subjected to variable gain amplification over a substantially linear operating range with the maximum amplitude of the amplified signals limited to a maximum value below the supply voltage and within the linear range of the variable gain amplifier. The amplified signals are converted to a binary pulse train signifying the temporal length of each active carrier period and the temporal length of each quiescent carrier period. The binary pulse train is decoded and a valid vehicle signal is generated if the decoded binary pulse train matches a permissible code sequence.
摘要翻译： 一种自动车辆识别（AVI）系统信号处理技术，其提供改进的性能和可靠性，并且基本上消除了环境噪声信号对AVI接收机对允许代码序列的检测的不利影响。 对AVI接收机的输入信号进行滤波，以除去载波频率以外的所有频率分量。 滤波后的信号在基本上线性的工作范围内经受可变增益放大，放大信号的最大幅度被限制在低于电源电压的最大值，并且在可变增益放大器的线性范围内。 被放大的信号被转换为表示每个有效载波周期的时间长度和每个静态载波周期的时间长度的二进制脉冲串。 解码二进制脉冲序列，如果解码的二进制脉冲串匹配允许代码序列，则生成有效的车辆信号。
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公开(公告)号：US07014355B2
公开(公告)日：2006-03-21
申请号：US09866919
申请日：2001-05-30
CPC分类号： G07F17/248 , G07C1/30 , G07F17/246 , G08G1/042 , G08G1/14
摘要： The field of the present invention is parking meters and more particularly to the use of electronically operated parking meters coupled with a sensor for positively sensing unobtrusively the presence or absence of a vehicle in a specified parking space controlled by the sensor and electronically operated parking meter. An induction coil mounted below the surface of the parking area is used to provide positive signals to the electronically operated parking meter and a cpu upon both the entrance of a vehicle into the parking space and the movement of the vehicle from the parking space. Moreover, the detecting system is battery operated and the battery life is extended by duty cycle operation of the detector system, whereby only a small portion of a detecting cycle is actually employed for detecting the status of the parking space.
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