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Traffic signal lamp fault threshold value automatic detection method and circuit

A technology of traffic lights and fault thresholds, applied in the field of intelligent transportation, can solve the problems of manual debugging, inaccurate detection thresholds, and poor operability of detection methods, and achieve the effects of strong operability, high detection efficiency, and improved detection speed

Active Publication Date: 2016-03-02
QINGDAO HISENSE TRANS TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing traffic signal lamp fault detection threshold is inaccurate and the detection method requires manual debugging and poor operability, the present invention proposes an automatic detection method for traffic signal lamp fault threshold, which can solve the above problems

Method used

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  • Traffic signal lamp fault threshold value automatic detection method and circuit
  • Traffic signal lamp fault threshold value automatic detection method and circuit
  • Traffic signal lamp fault threshold value automatic detection method and circuit

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Embodiment 1

[0039] Embodiment one, see figure 1 As shown, the present embodiment proposes a method for automatic detection of a traffic signal failure threshold, comprising the following steps:

[0040] Coarse tuning detection steps, including:

[0041] Start with the initial voltage value of the coarse channel, and gradually increase the voltage value applied to the current channel with a step size of D1. Each time the voltage value is increased, it corresponds to a working state, and the current value corresponding to the voltage value is recorded. The voltage value applied to the current channel is not greater than the upper limit value Umax, calculate the current change value between two adjacent working states, find out the maximum current change value △Imax1 of the rough adjustment from all the current change values, and determine the rough adjustment The working state when the maximum current change value △Imax1, and the voltage value and current value in this working state are re...

Embodiment 2

[0058] Embodiment 2, based on the automatic detection method for traffic signal lamp fault threshold in embodiment 1, this embodiment proposes a traffic signal lamp fault threshold automatic detection circuit, such as image 3 As shown, it includes a main control board, a first single-chip microcomputer, a second single-chip microcomputer, an optocoupler drive circuit, a thyristor output circuit, a current sampling circuit, and a voltage sampling circuit. The thyristor output circuit is connected to the traffic signal light circuit. The detection circuit described above performs the following detection methods:

[0059] The coarse adjustment detection step includes: the main control board controls the first single-chip microcomputer to send a voltage regulation signal to the optocoupler drive circuit, and the optocoupler drive circuit drives the voltage value applied to the traffic signal by the thyristor output circuit to roughly adjust the initial voltage value of the channel...

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Abstract

The invention discloses a traffic signal lamp fault threshold value automatic detection method. The method includes a coarse adjustment detection step and a fine adjustment detection step. According to the coarse adjustment detection step, starting from a coarse adjustment channel initial voltage value, the value of voltage applied to a current channel is increased gradually wit a step D1, and when the value of the voltage is increased each time, a new value obtained each time is corresponding to one work state, and current values corresponding to the voltage values are recorded, and a coarse adjustment voltage threshold value Un and a coarse adjustment current threshold value In are determined. According to the fine adjustment detection step, starting from a fine adjustment channel initial voltage value, the value of voltage applied to the current channel is increased gradually wit a step D2, and when the value of the voltage is increased each time, a new value obtained each time is corresponding to one work state, and a traffic signal lamp fault voltage threshold value and a traffic signal lamp fault current threshold value are determined. According to the method of the invention, different voltage is applied, and a voltage value and a current value which appear correspondingly when the current of a signal lamp changes greatly are detected, and a startup threshold value does not require manual debugging. The method has the advantages of high operability and high detection efficiency.

Description

technical field [0001] The technical field of intelligent transportation of the present invention, in particular, relates to a method and circuit for automatic detection of fault thresholds of traffic signal lamps. Background technique [0002] The fault detection of traffic signal lights is mainly to complete the judgment of whether the signal lights are on or off by detecting the current and voltage of the signal lights when they are working. Therefore, an appropriate detection threshold will reduce the false positive and false alarm rate of signal lamp failure, which is very important for signal lamp fault detection. [0003] However, different manufacturers, different types, and even different batches of signal lights have different operating voltages and currents. However, the current traffic signal light fault detection uses a unified detection threshold, so only simple fault detection can be realized, resulting in a high rate of false positives and false positives fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/097H05B37/03
CPCG08G1/097H05B47/20
Inventor 谢清华王华伟衣佳政辛德亮李贺刘树森赵卫
Owner QINGDAO HISENSE TRANS TECH
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