Single sensor motor vehicle velocity detector
阅读：579发布：2023-05-22
专利汇可以提供Single sensor motor vehicle velocity detector专利检索，专利查询，专利分析的服务。并且In this detector, the sinusoidally varying signal voltage induced in an inductive sense loop by a ferromagnetic motor vehicle passing over it is adjusted by a low pass filter having a 6 db. per octave high frequency roll off characteristic in order to obtain a signal waveform of essentially uniform amplitude regardless of vehicle velocity. The frequency of the initial portion of the induced signal, which is proportional to the vehicle velocity, is measured by sequentially detecting two successive peak transitions of the filtered signal and measuring the time interval therebetween.，下面是Single sensor motor vehicle velocity detector专利的具体信息内容。
1. Apparatus for detecting the velocity of a moving vehicle comprising a single passive sensor comprising an inductive loop of electrically conductive wire oriented with respect to a roadway such that a vehicle moving in a prescribed orientation with respect to said loop induces a sinusoidally varying voltage in said loop, means for measuring the frequency of the initial portion of said induced signal voltage for producing an indication of the vehicle velocity, comprising first means for detecting the occurrence of one transition of said induced signal voltage, second means for detecting the occurrence of a transition of said induced signal voltage occurring subsequent to said one transition, and means for measuring the time interval between the occurrence of said one and said subsequent transition for producing an indication of the vehicle velocity, frequency selective means for coupling the induced signal voltage in said loop to said first and second detecting means, said frequency selective means having a low frequency pass characteristic with a high frequency roll off of approximately 6 db per octave, and means for converting the sinusoidal variations of the induced signal voltage from said frequency selective means to one polarity with respect to a reference potential, said first and second detecting means comprising third means responsive to the output oF said converting means for detecting the time of occurrence of the peak values of consecutive variations of signal voltage.
2. Apparatus according to claim 1 wherein said time interval measuring means comprises a generator responsive to one output of said third detecting means for initiating generation of a linear ramp voltage, and a circuit responsive to a subsequent output of said third detecting means for sampling and holding the magnitude of the ramp voltage, the amplitude of the ramp voltage being a measure of the vehicle velocity.
3. Apparatus for detecting the velocity of a moving vehicle comprising an inductive loop of electrically conductive wire oriented with respect to a roadway such that a vehicle moving in a prescribed orientation with respect to said loop induces a sinusoidally varying voltage in said loop, means for measuring the frequency of the initial portion of said induced signal voltage for producing an indication of the vehicle velocity, comprising first means for detecting the occurrence of one transition of said induced signal voltage, second means for detecting the occurrence of a transition of said induced signal voltage occurring subsequent to said one transition, and means for measuring the time interval between the occurrence of said one and said subsequent transitions for producing an indication of the vehicle velocity, frequency selective means for coupling the induced signal voltage in said loop to said first and second detecting means, said frequency selective means having a low frequency pass characteristic with a high frequency roll off of approximately 6 db per octave, and means for converting the sinusoidal variations of the induced signal voltage from said frequency selective means to one polarity with respect to a reference potential, said first and second detecting means comprising third means responsive to the output of said converting means for detecting the time of occurrence of the peak values of consecutive variations of the signal voltage, said third detecting means comprising a comparator having first and second input terminals and an output terminal, first and second diodes connected in the same polarity between the first and second input terminals, respectively, of said comparator and the output of said converting means, a capacitor connected between said second input terminal of said comparator and a reference potential, and a third diode connected in the opposite polarity in parallel with said second diode.
| 标题 | 发布/更新时间 | 阅读量 |
|---|---|---|
| 基于光伏多电平逆变器并网的变指数积分复位控制方法 | 2020-07-09 | 4 |
| 一种倍频正弦脉宽调制的数字实现方法 | 2021-01-21 | 4 |
| 适用于高阶QAM的自适应均衡与载波恢复方法及其电路 | 2021-12-12 | 1 |
| 一种基于以太网的电能质量在线监测装置 | 2020-12-13 | 1 |
| 水中沉积物检测系统及方法 | 2021-08-10 | 1 |
| Voice output device | 2022-10-05 | 2 |
| Measuring method and detector for wave height | 2022-11-28 | 0 |
| Corrosion monitoring system | 2021-11-30 | 1 |
| 用于具有阈值扩展的FM调制的设备 | 2020-11-23 | 2 |
| 전자식 방위 검출용 위상 보상회로 | 2022-09-13 | 2 |
高效检索全球专利专利汇是专利免费检索,专利查询,专利分析-国家发明专利查询检索分析平台，是提供专利分析，专利查询，专利检索等数据服务功能的知识产权数据服务商。
我们的产品包含105个国家的1.26亿组数据，免费查、免费专利分析。
分析报告
专利汇分析报告产品可以对行业情报数据进行梳理分析，涉及维度包括行业专利基本状况分析、地域分析、技术分析、发明人分析、申请人分析、专利权人分析、失效分析、核心专利分析、法律分析、研发重点分析、企业专利处境分析、技术处境分析、专利寿命分析、企业定位分析、引证分析等超过60个分析角度，系统通过AI智能系统对图表进行解读，只需1分钟，一键生成行业专利分析报告。
QQ群二维码
意见反馈
意见反馈