CN110930736A

CN110930736A - Crossroad traffic light control system

Info

Publication number: CN110930736A
Application number: CN201911114820.2A
Authority: CN
Inventors: 孙春玲; 刘本超; 刘福海; 郭化超; 宋美玉; 于晓英; 郑峥
Original assignee: Shandong Transport Vocational College
Current assignee: Shandong Transport Vocational College
Priority date: 2019-11-14
Filing date: 2019-11-14
Publication date: 2020-03-27

Abstract

The invention relates to a traffic light control system, in particular to a traffic light conversion time control system for a modern city crossroad, belonging to the field of traffic transportation control. The invention finds out the defects by deeply researching the domestic traffic light control system and designs a set of new traffic light control scheme to relieve the long-time traffic jam problem. The system identifies the traffic flow of the crossroad through the vehicle identification system, transmits the traffic flow information to the single chip microcomputer, calculates the traffic flow through software programming of the single chip microcomputer, and timely adjusts the control time of traffic lights, thereby realizing reasonable time distribution and effective control of urban traffic. The hardware of the crossroad traffic light control system mainly comprises modules such as an ECU, a reset circuit, a crystal oscillator circuit, a power supply circuit, a vehicle identification system processing circuit, a time display circuit, a traffic light conversion driving circuit and the like. The invention can solve the problem that the extension time of the traffic light can not be adjusted according to the actual road condition in the existing control system, and can relieve the traffic jam problem of the crossroad to a certain extent.

Description

Crossroad traffic light control system

Technical Field

The invention relates to a traffic light control system, in particular to a traffic light conversion time control system for a modern city crossroad, belonging to the field of traffic transportation control.

Background

With the increasing of the quantity of traffic tools in China, the urban traffic flow is increasing day by day, and the problem of urban traffic jam becomes a problem to be solved urgently. Urban traffic congestion has severely affected people's lives, and traffic congestion at intersections has become more and more prominent. On the premise, how to reasonably realize the traffic light control of the crossroads so as to relieve the problem of traffic jam of the crossroads becomes important. The invention formally designs a crossroad traffic light control system based on the method, and aims to reasonably allocate the extension time of red light, yellow light and green light, relieve traffic jam and provide convenience for life of people.

The invention has the following beneficial effects and advantages:

1. real-time response is fast

The crossroad vehicle information is identified in real time through a vehicle identification system, and the traffic light extension time is regulated and controlled in time;

2. the system has high precision

The system takes a control unit ECU as a main body, acquires vehicle information, accurately adjusts the prolonging time of the traffic light through software programming, samples in real time and effectively relieves traffic jam;

3. small occupied space

The single chip microcomputer control system is adopted, the input circuit and the output circuit of the system are reasonably configured, the occupied space is small, and the system can be directly installed on a traffic light.

Disclosure of Invention

The invention is an intelligent device for real-time environment sensing and information processing through the control unit ECU, and has the advantages of low cost, high stability and reliability.

The invention relates to a novel crossroad traffic light control system, in particular to crossroad traffic light conversion time control, which can relieve the traffic jam problem of crossroads to a certain extent and bring greater convenience to the life of people.

In order to achieve the above object, the technical solution adopted by the present invention to solve the technical problem is:

the invention finds out the defects by deeply researching the domestic traffic light control system and designs a set of new traffic light control scheme to relieve the long-time traffic jam problem. The system identifies the traffic flow of the crossroad through the vehicle identification system, transmits the traffic flow information to the single chip microcomputer, calculates the traffic flow through software programming of the single chip microcomputer, and timely adjusts the control time of traffic lights, thereby realizing reasonable time distribution and effective control of urban traffic. The hardware of the crossroad traffic light control system mainly comprises modules such as a control unit ECU, a reset circuit, a crystal oscillation circuit, a power supply circuit, a vehicle identification system processing circuit, a display circuit, a traffic light conversion driving circuit and the like.

The vehicle identification system processing circuit is mainly used for identifying vehicle information and counting through a counter circuit when vehicles wait at a crossroad.

The power supply circuit comprises a voltage stabilizer LM2576T, a voltage stabilizing diode D1, an inductor L1, a capacitor C1, a capacitor C2, a capacitor C3 and a transformer L2. The input voltage of the voltage stabilizer LM2576T is 12V, the output voltage is 5V, and the capacitors C1, C2 and C3 are connected in parallel at two ends of a power supply; the voltage stabilizing diode D1 is connected in parallel between the output end of the voltage stabilizer and the ground. The 12V power supply is converted to a +5V power supply by a monolithic switching regulator LM 2576T.

The system reset circuit comprises a MAX813L chip, a reset switch SW2, a capacitor C9 and the like, and when the low level of the/MR input of the MAX813L chip is kept for more than 140ms, the/RST generates a reset signal. In the reset circuit, the/WDO key is connected to the/MR key, the SW2 is pressed to input a low level signal to the/MR terminal, the/RST pin of the MAX813L is kept at a low level for more than 200 milliseconds, and the system can be effectively reset.

The display circuit comprises address latches 74LS373, 74LS138 decoder, LED nixie tube, resistor and the like. The two parallel resistors are a resistor R1 and a resistor R2 respectively, and the resistance values of the resistor R1 and the resistor R2 are the same. The eight parallel resistors are resistors R3-R10 respectively, and the resistances of the resistors R3-R10 are the same. The two LED nixie tubes D61-D62 adopt a common cathode connection method and dynamic display.

The traffic light conversion driving circuit comprises a driver, an LED1, an LED2, an LED3, a resistor and the like. The three resistors R are respectively a resistor R14, a resistor R15 and a resistor R16, the resistances of the resistor R14, the resistor R15 and the resistor R16 are the same, and the LED1, the LED2 and the LED3 are respectively a red lamp, a yellow lamp and a green lamp.

Description of the drawings:

FIG. 1 is a hardware circuit diagram of a traffic light control system of the present invention;

FIG. 2 is a control system power supply circuit diagram of the present invention;

FIG. 3 is a control system reset circuit diagram of the present invention;

FIG. 4 is a control system display circuit of the present invention;

FIG. 5 is a control system traffic light conversion driving circuit of the present invention;

FIG. 6 is a control system software flow diagram of the present invention.

The specific implementation mode is as follows:

the invention is further described below with reference to the accompanying drawings and examples.

Referring to fig. 1, the intersection traffic light control system is mainly composed of an input part and an output part. The input circuit comprises a reset circuit, a crystal oscillator circuit, a power supply circuit and a vehicle identification system processing circuit; the output circuit comprises a time display circuit and a traffic light conversion driving circuit.

The crossroad traffic light control system identifies the traffic flow of the crossroad through the vehicle identification system, counts through the counter circuit, transmits traffic flow information to the single chip microcomputer, calculates the traffic flow through software programming of the single chip microcomputer, and timely adjusts the control time of the traffic light, so that reasonable time distribution and effective control of urban traffic are realized.

Take the traffic condition at an intersection at a certain time as an example: when the south-north road is a red light and the east-west road is a green light, no vehicle passes on the east-west road at the moment, and a plurality of vehicles wait to pass on the south-north road. In order to shorten the waiting time and relieve traffic jam, the crossroad traffic light control system starts to function. The crossroad traffic light control system identifies the vehicle conditions of the east-west road and the south-north road at the moment through the vehicle identification system, transmits the vehicle information to the ECU computer, carries out traffic light conversion software programming on the ECU computer in advance, judges according to the transmitted vehicle information through the ECU computer, and calls a conversion software program for adjusting the traffic lights in time. Therefore, the system converts the red lights in the north-south direction into the green lights in time, converts the green lights in the east-west direction into the red lights, adjusts the traffic lights at the crossroad in time, and solves the problem of traffic jam caused by the time of converting the traffic lights in real time.

Referring to fig. 2, the power circuit includes a voltage regulator LM2576T, a zener diode D1, an inductor L1, a capacitor C1, a capacitor C2, a capacitor C3, and a transformer L2. The input voltage of the voltage stabilizer LM2576T is 12V, the output voltage is 5V, and the capacitors C1, C2 and C3 are connected in parallel at two ends of a power supply; the voltage stabilizing diode D1 is connected in parallel between the output end of the voltage stabilizer and the ground. The 12V power supply is converted to a +5V power supply by a monolithic switching regulator LM 2576T.

Referring to fig. 3, the system reset circuit includes a MAX813L chip, a reset switch SW2, a capacitor C9, etc., and when the low level of the/WR input of the MAX813L chip is maintained for more than 140ms, the/RST generates a reset signal. In the reset circuit, the/WDO key is connected to the/MR key, the SW2 is pressed to input a low level signal to the/MR terminal, the/RST pin of the MAX813L is kept at a low level for more than 200 milliseconds, and the system can be effectively reset.

Referring to fig. 4, the display circuit includes address latches 74LS373, 74LS138 decoder, LED nixie tube, resistors, etc. The two parallel resistors are a resistor R1 and a resistor R2 respectively, and the resistances of the resistor R1 and the resistor R2 are the same. The eight parallel resistors are respectively a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a resistor R10, and the resistances of the resistor R3, the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8, the resistor R9 and the resistor R10 are the same. Two LED nixie tubes DS1-DS2 adopt a common cathode connection method and dynamic display.

Referring to fig. 5, the traffic light conversion driving circuit includes a driver 7407, an LED1, an LED2, an LED3, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, an and gate, a not gate, and the like. The resistances of the resistors R14 and R15 are the same, the resistances of the resistor R14, the resistor R15 and the resistor R16 are the same, and the LED1, the LED2 and the LED3 are respectively a red light, a yellow light and a green light.

Claims

1. A crossroad traffic light control system is characterized in that a control system circuit mainly comprises modules such as an ECU, a reset circuit, a crystal oscillator circuit, a power supply circuit, a vehicle identification system processing circuit, a time display circuit, a traffic light conversion driving circuit and the like.

2. The vehicle recognition system processing circuit of claim 1, wherein the recognition system is installed at a lower side of the traffic light, and when there is a vehicle waiting at the intersection, the vehicle recognition system recognizes the vehicle information and performs counting by the counter circuit.

3. The power supply circuit of claim 1, wherein the circuit comprises a voltage regulator LM2576T, a zener diode D1, an inductor L1, a capacitor C1, a capacitor C2, a capacitor C3, a transformer L2; the input voltage of the voltage stabilizer LM2576T is 12V, the output voltage is 5V, and the capacitors C1, C2 and C3 are connected in parallel at two ends of a power supply; the voltage stabilizing diode D1 is connected in parallel between the output end of the voltage stabilizer and the ground; 5. the power supply circuit converts a 12V power supply into a +5V power supply through a monolithic switching regulator LM 2576T.

4. The reset circuit of claim 1, wherein the circuit comprises a MAX813L chip, a reset switch SW2, a capacitor C9, etc.; the MAX813L chip generates a reset signal when the/RST input is held at a low level for more than 140 ms.

5. The reset circuit of claim 1, wherein the/WDO key is connected to the/MR key, and when SW2 is pressed to input a low signal to the/MR terminal, the/RST pin of MAX813L is low and remains at 200 ms or more, so that the system can be reset effectively.

6. The display circuit of claim 1, wherein said circuit comprises address latches 74LS373, 74LS138 decoder, LED nixie tubes, resistors, etc.; the two parallel resistors are respectively a resistor R1 and a resistor R2, and the resistances of the resistor R1 and the resistor R2 are the same; the eight parallel resistors are respectively a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a resistor R10, and the resistances of the resistor R3, the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8, the resistor R9 and the resistor R10 are the same.

7. The display circuit of claim 6, wherein the LED nixie tube DS1-DS2 adopts a common cathode connection method and dynamic display.

8. The traffic light conversion driving circuit according to claim 1, wherein the circuit comprises a driver 7407, an LED1, an LED2, an LED3, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, an AND gate, a NOT gate, and the like; the resistances of the resistors R14 and R15 are the same, the resistances of the resistor R14, the resistor R15 and the resistor R16 are the same, and the LED1, the LED2 and the LED3 are respectively a red light, a yellow light and a green light.