CN106373409B - Monitoring circuit of annunciator - Google Patents
Monitoring circuit of annunciator Download PDFInfo
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- CN106373409B CN106373409B CN201611032346.5A CN201611032346A CN106373409B CN 106373409 B CN106373409 B CN 106373409B CN 201611032346 A CN201611032346 A CN 201611032346A CN 106373409 B CN106373409 B CN 106373409B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 52
- 238000004891 communication Methods 0.000 claims description 7
- 230000011664 signaling Effects 0.000 claims 1
- 230000002159 abnormal effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
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- General Physics & Mathematics (AREA)
- Selective Calling Equipment (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates to a signal machine monitoring circuit which comprises a main control circuit, a monitoring circuit and a plurality of driving circuits, wherein the monitoring circuit and the driving circuits are connected with the main control circuit through a CAN bus, the main control circuit is used for issuing a lamp group control instruction, the driving circuits are used for receiving the control instruction and driving corresponding red, yellow and green signal lamps to work, the monitoring circuit is used for detecting circuit faults in real time and judging related faults, and the signal machine yellow flash is independently controlled through driving output signals K1 and K2. The invention effectively realizes fault monitoring and independent yellow flashing control of the annunciator, and does not need to connect each yellow lamp output of the driving circuit in parallel to the monitoring circuit, so that the wiring is simple; meanwhile, the monitoring circuit does not need related components controlled by alternating current, so that the monitoring circuit is safe and reliable and has low application cost.
Description
Technical Field
The invention relates to the technical field of traffic signal control, in particular to a traffic signal monitoring circuit.
Background
According to the related standard requirements of the annunciator, when the annunciator cannot work normally, the annunciator can be switched into a yellow flashing state through an independent yellow flashing control circuit. The current annunciator realizes the fault detection and control mode by designing an independent yellow flashing control circuit, such as a patent CN202677618U, wherein the control output is connected in parallel with the control output of a driving circuit, the control circuit can realize the direct control of each yellow lamp, but the yellow flashing control circuit directly controls the yellow lamps, a high-voltage circuit is complex, the application cost is higher, each yellow lamp control output of the yellow flashing control circuit is required to be connected on the yellow lamp output of the corresponding annunciator driving circuit in parallel, the wiring is more, the reliability is not high, and the method can not realize the free expansion of the yellow flashing control function conveniently and effectively when the signal lamp groups are increased or decreased or changed (such as the pedestrian lamp group without the yellow lamps is exchanged with the pedestrian lamp group with the yellow lamps).
Disclosure of Invention
The invention aims to provide a signal machine monitoring circuit which can realize effective monitoring of corresponding abnormal states and yellow flashing control of signal lamps, solves the technical problems of high application cost, complex connecting lines and poor flexibility of free expansion of the current signal machine fault monitoring and independent yellow flashing control circuit, and realizes more convenient and effective monitoring and control of abnormal states of the signal machine.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the signal machine monitoring circuit comprises a main control circuit, a monitoring circuit and a plurality of driving circuits, wherein the monitoring circuit is connected with the main control circuit through a CAN bus, the main control circuit is used for issuing a lamp group control instruction, the driving circuits are used for receiving the control instruction and driving corresponding red, yellow and green signal lamps to work, the monitoring circuit is used for detecting circuit faults in real time and judging related faults, and the signal machine yellow flashing is independently controlled through driving output signals K1 and K2.
The monitoring circuit comprises a decoder J1, an AND gate F2, a decoder Q1 and an OR gate F3, wherein the input end of the decoder J1 is connected with a first main chip and a communication circuit, the output DO end of the decoder J1 is connected with the input A end of the AND gate F1, the output D3 end of the decoder J1 is connected with the input B end of the OR gate F3, the input A end of the AND gate F2 is connected with the output D0 end of the decoder J1, the input B end of the AND gate F1 and the input B end of the AND gate F2 are connected with a second main chip and the communication circuit, the output end of the AND gate F1 is connected with the input SA end of the decoder Q1, the output D3 end of the AND gate F2 is connected with the input A end of the OR gate F3, the output D3 end of the decoder J1 is connected with the input B end of the OR gate F3, the output D1 of the AND gate Q1 is connected with a red light driving signal, the output D2 of the AND gate F3 is connected with a yellow light driving signal.
The decoder J1 and the decoder Q1 are respectively two-four decoders with the model number of 74HC 139.
The OR gate F3 adopts a chip with the model number of SN74LVC1G 32.
And the AND gate F1 and the AND gate F2 are chips with the model number of SN74LVC2G 08.
The main chip selects an STM32 control circuit.
According to the technical scheme, the signal machine fault is effectively monitored through CAN bus connection of the monitoring circuit and the driving circuit. The independent yellow flashing control of the monitoring circuit to the signal lamp through the IO level signal is realized through the level bus and the driving circuit. Through real-time monitoring and effective control of the monitoring circuit, safe and reliable operation of the annunciator is realized. Through the connection of the level signal wires, the fault yellow flashing control of the annunciator is effectively realized. The circuit can realize free expansion of the driving circuit, each yellow lamp output is not required to be independently connected to the monitoring circuit, and wiring is simple; meanwhile, the monitoring circuit does not need related components controlled by alternating current, so that the monitoring circuit is safe and reliable and has low application cost.
Drawings
FIG. 1 is a circuit block diagram of the present invention;
fig. 2 is a circuit diagram of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, the signal monitoring circuit of the present embodiment includes a main control circuit 1, a monitoring circuit 2 and a plurality of driving circuits 3, where the main control circuit 1, the monitoring circuit 2 and the plurality of driving circuits 3 share a set of CAN buses to perform information interaction, the main control circuit 1 issues a lamp set control command, and the driving circuits 3 receive the command and drive corresponding red, yellow and green signal lamps. When faults such as the fact that the main control circuit 1 of the annunciator cannot work normally or the main chip of the driving circuit 3 cannot control normally occur, the monitoring circuit 2 monitors and judges related faults in real time through the CAN bus, and the annunciator yellow flash is independently controlled through driving the output signals K1 and K2.
As shown in fig. 2, the monitor circuit 2 includes a decoder J1, the driving circuit 3 includes an and gate F1, an and gate F2, a decoder Q1 and an or gate F3, the input end of the decoder J1 is connected to the main chip and the communication circuit, the output DO end of the decoder J1 is connected to the input a end of the and gate F1, the output D3 end of the decoder J1 is connected to the input B end of the or gate F3, the input a end of the and gate F2 is connected to the output D0 end of the decoder J1, the input B end of the and gate F1 and the input B end of the and gate F2 are connected to the main chip and the communication circuit, the output end of the and gate F1 is connected to the input SA end of the decoder Q1, the output D3 end of the and gate F3 is connected to the input a end of the or gate F3, the output D3 end of the decoder J1 is connected to the input B end of the or gate F3, the output D1 of the decoder Q1 is connected to the red light driving signal, the output D2 is connected to the green light driving signal, and the output light driving signal is connected to the output light driving signal. The output D0 end of the decoder J1 is the output control signal K1 end, and the output D3 end of the decoder J1 is the output control signal K2 end.
The yellow flash control circuit outputs 2 control signals through two IO pins of a main chip U1, and 2 driving outputs are led out through D0 and D3 of a decoder J1 and are respectively connected to a K1 control bus and a K2 control bus. The decoder has the unique characteristic of outputting high level, so that the control circuit can ensure that 2 driving outputs of the monitoring circuit 2 are not high level at the same time, and ensure the control reliability; meanwhile, the level signals of the control buses K1/K2 are more stable and reliable due to stronger driving capability.
The driving circuit 3 receives the lamp group operation instruction of the main control circuit 1 through the CAN bus and controls the operation of the signal lamp. The lamp group control output of its main chip is interconnected with the 2 drive level outputs of the monitor circuit 2. The main chip of the driving circuit 3 connects two IO control signals io_3 and io_4 of the main chip and K1 output by the monitoring circuit 2 in parallel to the and gate F1 and the and gate F2, respectively, when K1 is at a high level, the and gate F1 and the and gate F2 can output high level signals when io_4 and io_4 are at a high level. The decoder Q1 ensures that only one of the outputs D1, D2, D3 is active high signal. The D3 output of the decoder Q1 in the driving circuit 3 is connected with the K2 driving signal of the monitoring circuit 2 in parallel to the OR gate F3 and is output as a yellow lamp control signal, so that the independent control of the yellow lamps by the driving circuit 3 and the monitoring circuit 2 is realized.
When the monitoring circuit 2 detects that the signal machine normally operates, the output IO_1 is low level (0), the output IO_2 is low level (0), and the high level (1) and the low level (0) of the K1 are output after passing through the decoder J1. Since K2 is low (0), or gate F3 is controlled only by the output D3 of decoder Q1, i.e., D3 can directly control the yellow light signal. At this time, the outputs of the and gates F1 and F2 are controlled only by the io_3 and io_4 of the driving circuit 3, and the main chip of the driving circuit 3 outputs the corresponding low-high (01) or high-low (10) or high-high (11) signals through the outputs io_3 and io_4, and outputs the D1 or D2 or D3 end of the decoder Q1 as the high level (1) respectively, so as to control the red light, the green light and the yellow light to be turned on or off.
When the monitoring circuit 2 detects that the signal machine works abnormally, the IO_1 high level (1) is output, so that the output K1 is low level (0), and the D1/D2/D3 are low level (0). The main chip of the monitoring circuit 2 outputs IO_2 as high level (1) or low level (0), K2 as high level (1) or low level (0), and the output of the main chip is independently high level (1) and low level (0) through an OR gate F3, so that the yellow lamp is turned on or off, namely, flash control is realized.
In this embodiment, the main chips of the monitor circuit 2 and the driving circuit 3 are STM32 control circuits, and have CAN signal output and IO level input/output functions. The effective connection of the CAN bus and the effective output control of the level signal CAN be realized. Each driving circuit 3 can drive four groups of red, yellow and green signal lamps, and a standard crossroad is connected with four driving circuits 3.
In order to realize unification of devices, in this embodiment, the decoders of the monitor circuit 2 and the drive circuit 3 are respectively two-four decoders 74HC139, so that two paths of IO inputs and four paths of level signal outputs can be realized. The monitoring circuit 2 only needs one of the decoder functions. Each driving circuit 3 is output by four signal lamp groups, and 2 74HC139 chips are needed. OR gate F3 adopts SN74LVC1G32 chip, can realize the OR logic function output control of 2 input signals. And the AND gates F1 and F2 adopt 2-way AND gate chips SN74LVC2G08, and can realize the input and output control of the AND logic function of two-way signals.
The main control circuit 1 and each driving circuit 3 generate an operation state of the main control circuit 1 and each driving circuit 3 once every second, if the operation state is abnormal (such as system maintenance) or a certain circuit board state is not generated for three continuous seconds (such as main chip damage or communication failure), the monitoring circuit 2 can judge that the annunciator cannot work normally, and at the moment, the monitoring circuit 2 can independently execute flash control on the yellow lamp; if all the circuit boards run normally for 5 seconds continuously and recovery is allowed, a recovery instruction CAN be sent from the CAN bus to enable the annunciator to resume executing a normal signal lamp running scheme, and the driving level outputs K1 and K2 are respectively normal high-level signals and normal low-level signals.
When the signal machine can not work normally, the monitoring device can realize effective monitoring of corresponding abnormal states and yellow flashing control of the signal lamp. The problems of high application cost, complex parallel connection line and poor flexibility of free expansion of the fault monitoring and independent yellow flashing control device of the current annunciator are solved, and the abnormal state of the annunciator is monitored and controlled more conveniently and effectively.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (5)
1. A signal monitoring circuit is characterized in that: the intelligent control system comprises a main control circuit, a monitoring circuit and a plurality of driving circuits, wherein the monitoring circuit and the driving circuits are connected with the main control circuit through a CAN bus, the main control circuit is used for issuing a lamp group control instruction, the driving circuits are used for receiving the control instruction and driving corresponding red, yellow and green signal lamps to work, the monitoring circuit is used for detecting circuit faults in real time and judging related faults, and the signaling machine is independently controlled to flash through driving output signals K1 and K2; the monitoring circuit comprises a decoder J1, an AND gate F2, a decoder Q1 and an OR gate F3, wherein the input end of the decoder J1 is connected with a first main chip and a communication circuit, the output DO end of the decoder J1 is connected with the input A end of the AND gate F1, the output D3 end of the decoder J1 is connected with the input B end of the OR gate F3, the input A end of the AND gate F2 is connected with the output D0 end of the decoder J1, the input B end of the AND gate F1 and the input B end of the AND gate F2 are connected with a second main chip and the communication circuit, the output end of the AND gate F1 is connected with the input SA end of the decoder Q1, the output D3 end of the AND gate F2 is connected with the input A end of the OR gate F3, the output D3 end of the decoder J1 is connected with the input B end of the OR gate F3, the output D1 of the AND gate Q1 is connected with a red light driving signal, the output D2 of the AND gate F3 is connected with a yellow light driving signal.
2. The traffic signal monitoring circuit according to claim 1, wherein: the decoder J1 and the decoder Q1 are respectively two-four decoders with the model number of 74HC 139.
3. The traffic signal monitoring circuit according to claim 1, wherein: the OR gate F3 adopts a chip with the model number of SN74LVC1G 32.
4. The traffic signal monitoring circuit according to claim 1, wherein: and the AND gate F1 and the AND gate F2 are chips with the model number of SN74LVC2G 08.
5. The traffic signal monitoring circuit according to claim 1, wherein: the main chip selects an STM32 control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611032346.5A CN106373409B (en) | 2016-11-22 | 2016-11-22 | Monitoring circuit of annunciator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611032346.5A CN106373409B (en) | 2016-11-22 | 2016-11-22 | Monitoring circuit of annunciator |
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| CN106373409A CN106373409A (en) | 2017-02-01 |
| CN106373409B true CN106373409B (en) | 2024-02-27 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107730879A (en) * | 2017-11-07 | 2018-02-23 | 汕头市鼎安电子科技有限公司 | A kind of zebra informant's row drive circuit of indicator to be linked by traffic lights |
| CN110390823B (en) * | 2018-04-18 | 2020-12-29 | 杭州海康威视数字技术股份有限公司 | Signal machine and signal lamp control method |
| CN110675641B (en) * | 2019-09-26 | 2022-02-18 | 公安部交通管理科学研究所 | Vehicle networking road traffic signal control system based on LTE-V2X |
| CN113406947B (en) * | 2021-05-28 | 2023-02-03 | 青岛海信网络科技股份有限公司 | Traffic signal controller and traffic signal control method |
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| EP0268060A1 (en) * | 1986-10-10 | 1988-05-25 | Siemens Aktiengesellschaft | Traffic signalling system |
| CN2717085Y (en) * | 2004-05-28 | 2005-08-10 | 华为技术有限公司 | Temperature monitoring apparatus |
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