CN201788587U - Intersection Inductive Intelligent Traffic Signal Real-time Control System - Google Patents

Abstract

The utility model discloses an inductive intelligent traffic signal real-time control system for intersections, comprising an information acquisition unit, a computing unit, and an output unit which are orderly connected, wherein the output unit is connected with a signal lamp driving circuit. The inductive intelligent traffic signal real-time control system for the intersections can exactly judge the change of the traffic stream, real-time convert the green signal, and shorten the time for the vehicles to wait for at the intersections, thereby improving the use rate of the green light at maximum extent, enhancing the traffic capacity of the vehicle at the intersections, and achieving the purposes of easing the road traffic congestion and reducing emission.

Description

Intersection Inductive Intelligent Traffic Signal Real-time Control System

technical field

The utility model relates to the field of automatic control of traffic facilities, in particular to an intersection induction intelligent traffic signal real-time control system.

Background technique

Traffic congestion and congestion is one of the problems that plague every major city traffic. In particular, the problem of major urban roads is more prominent, becoming the "intestinal blockage" of the entire road network, the focus of urban traffic congestion control, and the key point of improving road traffic capacity. The improvement of intersection traffic capacity involves many aspects, among which the intersection signal control method is the most important factor affecting the smoothness of the intersection. With the development of science and technology, advanced computerized regional control signal methods are used at road intersections in major cities and provincial capitals. However, due to factors such as huge investment, high technical requirements in all aspects, and high operation and maintenance costs, this control method is limited in my country. Universal use in cities. At present, the multi-period fixed-period signal light control method commonly used in cities, because of the unbalanced direction and time of the vehicles passing at the intersection, the control cycle cannot be changed in real time according to the traffic flow at any time, and the signal time utilization rate is low. The situation of eating "red light" is prominent, causing the loss of green light time in various degrees, thereby more obviously affecting the improvement of crossing traffic capacity, and also affecting the psychological emotions of drivers because of the "red light" phenomenon.

Utility model content

Aiming at the defects and deficiencies of the above-mentioned prior art, the technical problem to be solved by the utility model is to provide a real-time control system for intelligent traffic signals at intersections, which can maximize the utilization rate of control signals while controlling costs and the vehicle traffic capacity of the intersection, the signal control time and the vehicle flow in all directions of the intersection can be automatically and reasonably matched in each cycle in real time, thereby greatly improving the utilization rate of traffic signals and the traffic capacity of the intersection; effectively Alleviate intersection congestion and queuing conflicts.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is that a real-time control system for intelligent traffic signals at intersections includes a signal acquisition unit, a calculation unit, and an output unit connected to the signal lamp drive circuit connected in sequence, wherein the signal acquisition The unit includes a ground sense coil arranged inside the parking line at the single-lane exit. The ground sense coil is connected to the LC oscillating circuit through the isolation transformer. The LC oscillating circuit is connected to the detection chip through the coupling capacitor, and the output terminal of the detection chip is connected to The input port of the information recording chip is connected to the input port of the information recording chip, and the output port of the information recording chip is connected to the calculation unit through the isolation optocoupler module and the data communication chip.

As a preferred solution of the embodiment, the ground induction coil has a rectangular structure of 1.5m*2.5m.

As a preferred solution of the embodiment, the detection chip adopts a single-chip microcomputer AT89C2051; the information recording chip adopts a single-chip microcomputer STC12C5604.

In order to realize the circuit sharing of the ground sensing coil and the detection part, the two systems of "signal light" and "electronic police" at the intersection are organically combined, and the output end of the signal acquisition unit is connected to the camera module circuit.

As a preferred solution of the embodiment, the calculation unit includes a single-chip microcomputer U1 whose serial port is connected to the output end of the signal acquisition unit and is STC90C58, and the four phase state output port levels of the single-chip microcomputer U1 are directly connected to the output unit. The output port of the single-chip microcomputer U1 is connected with an LED indicator light.

In order to preset the time for pedestrians and non-motor vehicles to pass through the intersection, the signal input end of the single-chip microcomputer U1 in the calculation unit is also connected with a clock control unit and a key display unit.

Described clock control unit comprises the clock chip U1 that the model of DS12C887 is connected with each other and the control chip U2 that the model is STC90C58; Wherein the button display unit includes a plurality of button switches and YJD1602 liquid crystal displays that are connected with the interface module; Wherein the clock chip U1 passes through The interface module is connected with the key switch in the key display unit, and the output terminal of the control chip U2 is connected to the EN, R/W, RS terminals of the YJD1602 liquid crystal display in the key display unit through the interface module.

The output unit includes an output control chip U0 of the model STC90C58 and an output drive circuit, wherein each signal light instruction output port of the output control chip U0 is divided into two channels A and B, which are respectively connected to the isolated optocoupler module in the corresponding signal output circuit The input end of the isolated optocoupler module is connected to the bidirectional thyristor, that is, the bidirectional thyristor is controlled to drive the signal lamp to work. In order to enable both infrared remote control and manual control of the output unit to turn on and off immediately in the east-west and north-south directions of the green wave band, the output unit is also connected with a green wave band control circuit, that is, at the input port of the output control chip U0 It is also connected with an infrared receiving decoding tube and a key display unit.

In order to enable the output interface to output signals to the camera module circuit when the red light signal is turned on, that is, to control the camera to start the shooting function, the output control chip U0 signal light command output port in the output unit The red signal light output port is multiplexed to the camera at the same time module circuit.

In order for the calculation unit to immediately issue a stop signal output command in the event of an overload or short circuit, cut off the power supply of the output stage, effectively protect the output stage circuit, and start the independent yellow light full flashing circuit, the feedback signal terminal of the output unit is connected to A calculation unit, the output end of the calculation unit is connected to an independent full-flash circuit of yellow lights through a protection circuit.

As an implementation circuit, the above-mentioned independent yellow light full flashing circuit includes a 555 time base oscillation circuit connected to a DC 5V power supply through a group of points of the load protection relay KJ; the 12 output terminals of the 555 time base oscillation circuit are isolated from the The coupling chip is connected to the silicon controlled rectifier BTA16; at the same time, there is also a 220V AC power supply connected to the silicon controlled rectifier BTA16 through another group of points of the load protection relay KJ, and finally connected to the yellow signal light.

The working principle of the present utility model is described in detail as follows:

The intersection induction type intelligent traffic signal real-time control system uses a signal acquisition unit, a calculation unit and an output unit to track and record the vehicles entering and exiting the intersection in real time, and compare them centrally, and control the conversion of each signal cycle of the intersection signal light in real time according to the change of traffic flow. Wherein the signal recording chip in the signal acquisition unit carries out real-time tracking acquisition and upload information record to the vehicle induction signal with interrupt technology; When the car is in the state, the comparison result is integrated with the information of the green wave band, the information of the full flash of the yellow light at night, the time-limited control information, and the circuit fault information to form an instruction to the output unit to drive the signal light to switch; the calculation unit outputs 4 phase status signals (with pedestrians) Street crossing signal), 1 full flashing yellow light signal, 1 overload short-circuit protection signal to the output unit, the output unit starts its preset phase according to the signal instruction and implements the signal light conversion through the output circuit, and the preset phase can be set according to requirements ; When the ground induction coil in the signal acquisition unit cannot send the induction signal or the signal acquisition unit cannot upload and record information due to a fault, the calculation unit can turn the control of any faulty lane signal lights into a timing mode.

At the same time, the calculation unit and the output unit can receive infrared remote control by the infrared tube MK0038 or start and close the east-west and north-south green wave belt functions through the manual buttons SW1, SW2, SW3; the night yellow lights controlled by the calculation unit and the output unit are all flashing The signal is provided by the real-time clock chip DS12C887, and the switching time of the full flashing yellow light can be adjusted through the buttons S1, S2, S3, and S4. The overload and short circuit protection function of the load carried by the output circuit, when an overload or a short circuit occurs, the calculation unit will start an independent all-yellow flashing circuit to show the intersection signal light circuit failure; when the traffic flow is in a saturated state and pedestrians are crossing the street, the calculation unit can Press the buttons DS35S, DS60S, DS99S to switch the longest green light running time of 35 seconds, 60 seconds, and 99 seconds, and switch the second gear of 0 seconds and 15 seconds through the switch K1 to switch the shortest green light running time; the calculation unit can switch the change of the signal light through the switch K2 Two modes: intelligent mode and timing mode, so that the controller can choose a mode to work according to the needs; the system can add a camera module to realize the circuit sharing of the ground sensing coil and the detection part, and combine the "signal light" and "electronic police" at the intersection Two systems combined into one.

The utility model automatically detects the change of motor vehicle flow at the intersection, and compares and analyzes the traffic flow conditions in each direction at the intersection, and performs real-time intelligent matching and control on the green signal ratio and cycle of the intersection signal lights, so as to maximize the utilization rate of the green light at the intersection and the maximum efficiency of the intersection. Ability technology. This control system will effectively alleviate the contradictions of intersection congestion and queuing, and has general promotion and use value in the intersection signal control of large, medium and small cities.

Description of drawings:

Fig. 1 is the functional block diagram of the intersection induction type intelligent traffic signal real-time control system described in the embodiment;

Fig. 2 is a schematic diagram of the principle of the signal acquisition unit;

Figure 3 is a schematic diagram of the calculation unit principle;

Figure 4 is a schematic diagram of the output unit principle;

4A is a schematic diagram of the pins of the output control chip;

Fig. 4B is a schematic diagram of the output drive circuit;

Fig. 5 is a schematic diagram of the principle of the clock control unit;

Fig. 6 is a schematic diagram of the principle of the button display unit;

Figure 7 is a schematic diagram of an independent yellow light flashing circuit;

Figure 8 is a flowchart of the main program of the chip AT89C2051;

Fig. 9 is a flow chart of the main program of the chip STC12C5604;

Fig. 10 is the main program flowchart of the single-chip microcomputer U1 that model is STC90C58;

Fig. 11 is the main program flowchart of the single-chip microcomputer U0 that the model is STC90C58;

Fig. 12 is the main program flow chart of reading and writing of the clock chip DS12C887 by the single-chip microcomputer U2 whose model is STC90C58;

Figure 13 is a flow chart of the infrared remote control decoding model MK0038;

Figure 14 is a schematic circuit diagram of the infrared remote control transmitter model HT6221 chip.

Detailed ways

As shown in Figure 1, the controller of the utility model mainly includes the signal acquisition unit shown in Figure 2, the calculation unit shown in Figure 3, the output unit shown in Figure 4 and the auxiliary control circuit shown in Figures 6 and 7 constitute:

A ground sense coil is set up inside the parking line of each lane at the intersection. The ground sense coil and the single-chip microcomputer are combined to record the vehicle entry and exit signals, and the interrupt technology is used to track in real time. Other control information to determine the transition of the signal light. Its principle structure, please refer to accompanying drawing 1, explain as follows:

1. The information recording chip in the signal acquisition unit performs real-time tracking and recording of vehicle changes induced by the ground induction coil, as shown in (1)(2) in Figure 1;

2. The information recorded by each lane signal acquisition unit is uploaded to the calculation unit in the manner of being queried, (2)(4) in Figure 1;

3. The calculation unit integrates the information uploaded by the information recording chip in each signal acquisition unit and other control information for centralized calculation, and sends a conversion instruction to the output unit according to the calculation result, and the calculation unit has an indication of whether the receiving counting unit is normal or not, as shown in Figure 1 (3 )(4)(5);

5. The calculation unit is equipped with automatic statistics of vehicles and total traffic flow in all directions at the intersection, and can query the traffic flow data for a certain period of time, and upload the traffic flow data through the query interface. The traffic flow data can provide reference for the implementation of traffic engineering, as shown in Fig. 1 in (4) (12);

6. The calculation unit can limit the longest green light time of each phase through the key switch setting in the key display unit, and can implement multi-level regulation for this time period, as shown in (4)(11) in Figure 1;

7. The calculation unit can preset the time for pedestrians and bicycles to pass through the intersection through the key setting in the key display unit, (4) (11) in Fig. 1;

8. The output unit receives the instruction of the calculation unit and immediately transforms the signal to drive the signal lamp to work, (5)(6) in Figure 1;

9. The output unit has the ability to feed back the information of load overload and short circuit to the calculation unit. If there is an overload or short circuit, the calculation unit immediately sends a stop signal output command, cuts off the output stage power supply, effectively protects the output stage circuit, and starts the independent yellow light full lightning Road work, (4)(6)(7)(8) in Fig. 1;

10. The real-time clock liquid crystal display year, month, day, week, hour, minute, second, and control the output unit to send out a yellow light flashing signal at a designated time period at night by pressing the button, as shown in (4)(9)(10) in Figure 1 ;

11. Infrared remote control and manual can control the output unit to turn on and off immediately in the green wave band in the east-west direction and north-south direction, as shown in (13)(14)(15)(5) in Figure 1;

12. The signal light interface can output a signal to the camera module circuit when the red light signal is turned on, and start the shooting function, as shown in (6)(16)(17) in Figure 1;

13. This control system can be matched and connected with the existing intersection signal lamps, as shown in (6)(18) in Figure 1;

14. This control system can add a camera module to realize the circuit sharing of the ground sense coil and the detection part, and organically combine the two systems of the "signal light" and "electronic police" at the intersection, which greatly saves the investment in transportation facilities, as shown in Figure 1 Medium (2) (17).

Each realization unit in the utility model is described in detail as follows:

(1) Signal acquisition unit

As shown in Figure 2, the signal acquisition unit in this embodiment includes a ground induction coil arranged inside the parking line of each lane, and the ground induction coil is connected to the LC oscillation circuit through the interface and the isolation transformer, and the LC oscillation circuit is connected to the LC oscillation circuit through the coupling capacitor. The detection single-chip microcomputer whose model is AT89C2051 is connected, the output port of the detection single-chip microcomputer is connected to the input port of the signal recording single-chip microcomputer of the model STC12C5604, and the output port of the signal recording single-chip microcomputer is connected to the communication through the isolation optocoupler TIL117 and the communication control chip MAX485 transceiver bus.

At road traffic intersections, a ground induction coil L is laid on the inner side of the parking line of each lane on the side where the vehicle is waiting to pass, forming a vehicle induction area of a lane. The ground induction coil L is connected to the interface in the signal acquisition unit, and then isolated The transformer sends the induction signal to the LC oscillating circuit (see Figure 2); other lanes can be extended to 128 lanes by analogy, and 16 lanes are used in this method.

The sine wave generated by the LC oscillating circuit is sent to the detection chip U1 through the coupling capacitor C2, that is, the 12-pin of the single-chip microcomputer model AT89C2051 in Fig. 2 . During operation, U1 records the initial value of the frequency and conducts frequency discrimination. When it detects that the frequency change is >0.25%, the output level from pin 14 is reversed; at the same time, the detection chip U1 tracks the frequency change <0.05%, and quantifies the tracking result as a voltage Feedback to the LC oscillating circuit by way of tuning and controlling the LC oscillating circuit; the main program flow of AT89C2051 is shown in Figure 8.

The 14-pin output signal of the single-chip microcomputer U1 is sent to the 6-pin of the single-chip microcomputer U2 of the model STC12C5604, and its level change triggers the external interrupt INT0 of the single-chip microcomputer to record the signal formed by the vehicle entering and leaving the sensing area, and the generated record is passed through the serial port through the isolated light Coupling TIL117 and communication control chip MAX485 into the transceiver bus to upload data to the computing unit; the main program flow of STC12C5604 is shown in Figure 9.

Here, the output signal of pin 14 of the detection chip U1 can be connected to the camera module to realize the sharing of the detection circuit.

(2) Calculation unit

As shown in Figure 3, the calculating unit that present embodiment adopts comprises the single-chip microcomputer U1 that the model of STC90C58 that the serial port is connected with the signal acquisition unit, four phase state output ports of described single-chip microcomputer U1 connect output unit, the output of described single-chip microcomputer U1 The port is connected with an LED indicator light; the signal input end of the single-chip microcomputer U1 is also connected with a clock control unit including a clock chip DS12C887 and a key circuit.

The serial port of the single-chip microcomputer U1 of the calculation unit receives the information from the signal acquisition unit of different addresses (each lane), analyzes it, and performs logical operations on the analysis result and other control information to form a signal light phase control command. The 4 phase status commands are sent from U1 Port1~Port4 pins correspond to output to output control STC90C58 microcontroller U0 (as shown in Figure 7) Port23~Port26 pins; at the same time, U1's 21~28 pins and 32~39 pins are respectively connected to LED indicators D1~D16, which are sequentially indicated under software control Whether the communication status of the 16 lane counting is normal or not, the normal status is flashing, and the fault status is always on.

Port5 of the 7th pin of the single-chip microcomputer U1 of the calculation unit is the green wave conversion control input and is connected with Port32 of the 17th pin of the output unit single-chip microcomputer U0, and receives its green wave conversion control output signal. When this signal is low, U1 stops the phase conversion , the single-chip microcomputer U1 resumes the phase conversion when the high level is high; the Port6 of the 8th pin of the single-chip microcomputer U1 is connected to the K2 (ZD/DS) switch of the key circuit (Figure 6), and controls the operation mode of the single-chip U1 program: the high level is the timing mode, Low level is the intelligent mode; Port7 of the 12th pin of the microcontroller U1 is connected to Pout0 of the output unit (Figure 4B) to detect the current from the output circuit. When the load is overloaded or short-circuited, it will trigger the Port9 of the 16th pin of U1 to output a high level, so that The relay KJ of the output circuit operates, the load power is switched to the independent yellow light flashing circuit (Fig. 7), and only the yellow light flashes in the intersection signal light to indicate a fault; the Port8 of the 13th pin of U1 is connected with the clock chip DS12C887 19th in the clock control unit The pin is connected to receive the clock interrupt signal generated by it. When the clock runs to the set period at night, an interrupt will be generated. At this time, the single-chip microcomputer U1 stops the phase conversion and outputs a high level from Port10 of the 17th pin to Port30 of the output unit U0 to start the yellow light. Full flash until the set time period is over, the single-chip microcomputer U1 resumes the phase conversion control; the second pin Port0 of the single-chip microcomputer U1 is connected with the K1 (0S/15S) switch of the key display unit (Figure 6), and the shortest time limit for controlling the green light to run ( 0 second or 15 seconds can be selected); Port11~Port13 of the 29th, 30th, and 31st pins of the single-chip microcomputer U1 are respectively connected to the DS35S, DS60S, and DS99S buttons of the key display unit (Figure 6) to control the longest time limit for the green light to run (optional 35 seconds, 60 seconds, 99 seconds), when the traffic flow is small, the maximum time for the green light to run can be selected as 35 seconds, and when the traffic flow is heavy, the maximum time for the green light to run can be selected as 99 seconds; U1: STC90C58 main The program flow is shown in Figure 10.

(3) Output unit

As shown in FIG. 4, the output unit includes the STC90C58 output control chip U0 shown in FIG. 4A and the output drive circuit shown in FIG. 4B, wherein each signal light instruction output port of the output control chip U0 is divided into A and B The two channels are respectively connected to the input side of the corresponding output drive circuit isolation optocoupler MOC3041, and then connected to the signal light interface through the bidirectional thyristor BTA16; the control port of the output control chip U0 is connected to the infrared receiving decoding tube MK0038 and the button circuit; The red signal light output interface of the output control chip U0 is multiplexed to the electronic police circuit at the same time; the infrared receiving and decoding tube MK0038 receives the infrared wave from the infrared remote control transmitter (Figure 14), and its decoding process is shown in Figure 13.

As shown in Figures 4A and 4B, the output control of the output drive unit is mainly composed of the output control chip U0, which is preset by the software for 4 phase signal light states and 1 yellow light full flash state, and its 4~7 pins are connected to Port23Port26 respectively. Port1~Port4 of the calculation unit U1 are connected, the corresponding phase state is activated when the level is high, and the corresponding phase state is turned off when the level is low; the four phases are: state 1 east-west direction left and right, state 2 east-west direction straight, state 3 north-south direction Left and right travel, state 4 north-south straight travel, pedestrian signal lights and straight traffic signal lights are synchronized; red, green, yellow signal lights and pedestrian light commands in each direction are controlled by Port1~Port22 connected to pins 1~3, 21~39 of the output control chip U0, Port1~ Each port of Port22 is divided into A and B and connected to the corresponding output drive circuit to isolate the input side Port1A, Port1B~Port22A, Port22B of the optocoupler MOC3041 (see Figure 4B). The optocoupler controls the output of the bidirectional thyristor BTA16 to drive the signal light At the same time, the infrared remote control signal is sent to the 13th pin Port31 of U0 by the infrared receiving and decoding tube MK0038 to control the opening and closing of the east-west and north-south green wave bands, and the manual control of the green wave bands is controlled by the SW1, SW2, SW3 of the key display unit Operation: the full flashing yellow light at night command is connected from Port10 of the computing unit U1 to Port30 of the 12th pin of the unit U0, and the low level triggers the full flashing yellow light signal at night; in addition, the output interface of the red signal light of each lane is multiplexed to the camera Module circuit to start the camera work; U0: The main program flow of STC90C58 is shown in Figure 11.

(4) Auxiliary control circuit

It is mainly composed of a clock control unit (Figure 5), a key display unit (Figure 6) and an infrared remote control transmitter (Figure 14).

As shown in Figure 5, the clock control unit includes interconnected clock chip U1 of model DS12C887 and control chip U2 of STC90C58; Key switch and YJD1602 liquid crystal display; wherein the clock chip U1 is connected to the key switch in the key display unit via the interface module, and the output end of the control chip U2 is connected to EN, R/W of the YJD1602 liquid crystal display in the key display unit through the interface module , RS terminal.

In Fig. 5, the clock chip U1 (DS12C887) realizes initialization under the control of U2 (STC90C58), through S1 (function key), S2 (increase key), S3 (decrease key) Small key), S4 (confirmation key) to adjust the year, month, day, week, hour, minute, second and set the timer interrupt output, and U2 controls the YJD1602 liquid crystal display through its 29, 30, 31 pins EN, R/W, RS terminals, read data from U1 and write it into YJD1602A liquid crystal via D0~D7 to display the clock; STC90C58 MCU U2 controls DS12C887 clock chip U1 to read and write the main program flow shown in Figure 12.

As shown in Figure 6, when the key switches DS35S, DS60S, and DS99S of the operation key display unit set the maximum time limit for green light operation, their corresponding LED lights 35S, 60S, and 99S are on, indicating 35 seconds, 60 seconds, and 99 seconds respectively; When the operation switch K1 sets the shortest time limit of green light operation, LED lights DS0 and DS1 are on, indicating the shortest time limit of green light operation 0 seconds and 15 seconds respectively; when operating switch K2, LED lights DS and ZD are on, indicating timing mode and intelligent mode respectively; switch K0 is the power switch of the YJD1602A liquid crystal display, which can control the display to be turned on only when performing maintenance and adjusting settings.

As shown in Figure 14, S1 is the remote control green wave on, S2 is the east-west green wave on, S3 is the north-south green wave on, S4 is the remote green wave off, choose HT6221 as the infrared code chip, when the remote control When a button is pressed, a coded pulse is generated inside, and modulated into a 38Khz signal, which is sent out by Q1: S8050 drives the infrared emission tube D1.

(5) Independent yellow light flashing circuit

As shown in Figure 7, in the present embodiment, the independent yellow light full-flash circuit includes one end connected with a DC 5V power supply through one group of points of the load protection relay KJ, and the other end connected with the 555 chip U13 time base oscillation circuit; The output terminal of the 555 time base oscillation circuit is divided into 12 channels and connected to the control terminal of the thyristor BTA16 through the isolated optocoupler chip; at the same time, there is also a 220V AC power supply connected to the input of the thyristor BTA16 through another group of points of the load protection relay KJ terminal, and finally the SCR BTA16 output terminal is connected to the yellow signal light.

As shown in Figure 7, after the overload protection relay KJ operates, the DC 5V power supply is connected to the 555 time-base oscillation circuit through a group of contacts to generate a square wave with a period of 1 second and a duty ratio of 50%, which is divided into 12 channels and sent to the isolated optocoupler (MOC3041) U1~U12, the switch of the thyristor BTA16 is controlled by the optocoupler, and the other set of contacts of the relay KJ connects the 220V AC power to the thyristor to drive the yellow signal lights in all directions and lanes to work.

The utility model composed of the above-mentioned real-time control device for intelligent traffic signals at intersections, the counting unit tracks the traffic flow in real time, the calculation unit continuously refreshes the information, performs logic operations, and performs real-time conversion of the signal lights, and can be operated through buttons, remote control, etc. Realize many functions such as full flashing of yellow light and green wave band, and it has indeed become a real-time, efficient, new and practical intelligent traffic signal controller.

The above-mentioned embodiment and accompanying drawings are only a specific implementation manner for realizing the utility model, and cannot be used as a basis for explaining the protection scope of the utility model. Any technical solution that simply replaces or recombines the above-mentioned technical features without departing from the spirit of the scope of the utility model shall fall within the scope of protection required by the utility model.

Claims (10)

1. A crossing induction type intelligent traffic signal real-time control system is characterized in that it comprises a signal acquisition unit connected in sequence, a calculation unit and an output unit connected with a signal lamp drive circuit, wherein the signal acquisition unit includes a parking line arranged at the exit of a single lane The inner ground sense coil, the ground sense coil is connected to the LC oscillating circuit through the isolation transformer, the LC oscillating circuit is connected to the detection chip through the coupling capacitor, and the output end of the detection chip is connected to the input port of the information recording chip, so The output port of the above-mentioned information recording chip is connected to the calculation unit through the isolation optocoupler module and the data communication chip. 2. The real-time control system for intelligent traffic signals at intersections according to claim 1, wherein the ground induction coil is a rectangular structure of 1.5 meters * 2.5 meters. 3. according to the intersection induction type intelligent traffic signal real-time control system of claim 1, it is characterized in that, what described detection chip adopts is single-chip microcomputer AT89C2051; What described information recording chip adopts is single-chip microcomputer STC12C5604. 4. according to the intersection induction type intelligent traffic signal real-time control system of claim 1, it is characterized in that, the output end of described signal acquisition unit is connected with camera module circuit. 5. according to the described crossing induction type intelligent traffic signal real-time control system of claim 1, it is characterized in that, described computing unit comprises the model that the output end that serial port is connected with signal acquisition unit is the single-chip microcomputer U1 of STC90C58, four of described single-chip microcomputer U1 The level of each phase state output port is directly connected to the output unit, and the output port of the single-chip microcomputer U1 is connected with an LED indicator light. 6. according to the intersection induction type intelligent traffic signal real-time control system of claim 5, it is characterized in that, the signal input end of the single-chip microcomputer U1 in the said calculation unit is also connected with and comprises clock control unit and button display unit. 7. according to the described crossing induction type intelligent traffic signal real-time control system of claim 6, it is characterized in that, in the described clock control unit, comprise the clock chip U1 that the model that is connected to each other is DS12C887 and the control chip U2 that the model is STC90C58; Wherein button The display unit includes a plurality of key switches connected with the interface module and a YJD1602 liquid crystal display; wherein the clock chip U1 is connected to the key switches in the key display unit via the interface module, and the output end of the control chip U2 is connected to the key display unit via the interface module EN, R/W, RS terminals of the YJD1602 liquid crystal display in the middle. 8. according to the intersection induction type intelligent traffic signal real-time control system of claim 1, it is characterized in that, described output unit comprises the output control chip U0 that model is STC90C58 and output driving circuit, wherein every 1 road signal lamp of output control chip U0 The instruction output port is divided into two routes, A and B, which are respectively connected to the input end of the isolated optocoupler module in the corresponding signal output circuit, and the isolated optocoupler module is connected to the bidirectional thyristor; the input port of the output control chip U0 is also It is connected with an infrared receiving decoding tube and a key display unit. 9. according to the intersection induction type intelligent traffic signal real-time control system of claim 8, it is characterized in that, the red signal light output port in the signal light command output port of the output control chip U0 in the output unit is multiplexed to the camera module circuit simultaneously . 10. according to the intersection induction type intelligent traffic signal real-time control system of claim 8, it is characterized in that, the feedback signal end of described output unit is connected to calculation unit, and the output end of described calculation unit is connected to independent yellow light through protection circuit Full flashing circuit, the independent yellow light full flashing circuit includes a 555 time base oscillation circuit connected to a DC 5V power supply through a group of points of the load protection relay KJ; the 12 output terminals of the 555 time base oscillation circuit are isolated The coupling chip is connected to the thyristor BTA16; at the same time, 220V AC power is connected to the thyristor BTA16 through another group of points of the load protection relay KJ, and finally connected to the yellow signal light.

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