发明名称 |
Vehicle simulation circuit for loop traffic signal control system |
摘要 |
The present invention provides a simulator which when used aboard a vehicle normally undetectable by a traffic signal control system (e.g. A.C. energized buried sensing loop type which detects predetermined changes in the characteristics of an electromagnetic field due to the presence of a detectable vehicle therewithin), will substantially simulate the characteristics of a detectable vehicle within its field and thereby cause any activation of the system. Operationally, the simulator derives an electrical signal from the field (e.g. via a receiving antenna), converts the electrical signal into a modified transmittable signal of an amplitude which when impressed upon the field (e.g. via a transmitting antenna) simulates electromagnetic influence of a detectable vehicle therewithin which is sensed by the detector circuitry and activates an associated traffic signal controller to provide the necessary signals (e.g. a green arrow) to allow safe and unobstructed traffic flow at an intersection.
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申请公布号 |
US5057831(A) |
申请公布日期 |
1991.10.15 |
申请号 |
US19900529881 |
申请日期 |
1990.05.29 |
申请人 |
SIGNALMATIC INTERNATIONAL, INC. |
发明人 |
STRANG, CLIFFORD B.;FRUS, JOHN R. |
分类号 |
G08G1/042 |
主分类号 |
G08G1/042 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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