CN107856606A - A kind of oversize vehicle side shows early warning system and implementation method - Google Patents

Abstract

The invention discloses a large-scale vehicle side display early warning system and its realization method. A camera is installed directly above the front face of the vehicle body, ultrasonic probes are installed on the front and sides, speakers and LED display screens are installed on the sides, and a vehicle speed indicator is installed on the bottom surface. Sensor: The host is installed in the car, and monitors whether there are other vehicles or pedestrians passing through the front or side through the top camera, the front ultrasonic probe and the side ultrasonic probe, detects that there is an object moving in front, and sends an alarm through video and audio. Thereby reminding the side vehicles to avoid accidents. The invention can detect the compound environment through the front camera and the ultrasonic sensor, analyze and judge whether there are pedestrians or vehicles passing in front of the large vehicle, and then warn the side vehicles through the loudspeaker and LED display installed on the side of the large vehicle. Thereby reducing the probability of "ghost probe" accidents.

Description

A large vehicle side display early warning system and its implementation method

technical field

The invention relates to image recognition and display technology, specifically a signal installed on a large vehicle to identify and judge whether there are pedestrians and vehicles passing in front, and to issue a warning to side vehicles through LED displays and loudspeakers systems and implementation methods.

Background technique

With the continuous growth of China's economy, the number of motor vehicles in the country continues to increase, but with the increase of motor vehicles, the traffic accidents caused by motor vehicles are also increasing. The most common occurrence is the "ghost probe" type of accident.

The so-called "ghost probe" usually refers to the scene where pedestrians or vehicles suddenly appear from the front of car B or the rear of the opposite vehicle when car A overtakes car B. Encountering a "ghost probe" may cause the driver to brake suddenly in fright, or cause a traffic accident that may result in death or serious injury.

The two sides of the stopped large vehicles are the places where "ghost probes" are most likely to occur, such as bus stops. Passengers often walk around the front of the bus to cross the road after getting off the bus. Some children may even jump out of the front of the bus directly. Running across the road, at the same time, because the bus is huge, it completely covers the pedestrians in front of the car, so it is difficult for drivers of other vehicles to find out, thus causing accidents; another example is before the zebra crossing with the red light on, turning green at the traffic light At that moment, pedestrians or electric vehicles often rush through the red light with luck. At this time, the drivers of the vehicles parked on the side of the large vehicle cannot observe these pedestrians, and because the traffic light turns green, they will inevitably start to accelerate, resulting in tragedy. .

Contents of the invention

The purpose of the present invention is to provide a large vehicle side display early warning equipment and operation method, which can detect the composite environment through the front camera and ultrasonic sensor, analyze and judge whether there are pedestrians or vehicles passing in front of the large vehicle, and then pass The loudspeaker and LED display installed on the side of the large vehicle warn the vehicles on the side, thereby reducing the probability of "ghost probe" accidents.

The present invention adopts the following technical solutions to achieve the above object. A side display early warning system for a large vehicle, comprising a vehicle body, a camera is installed directly above the front face of the vehicle body, ultrasonic probes are installed on the front and sides, speakers and LED display screens are installed on the sides, and a vehicle speed sensor is installed on the bottom surface ;

A host is installed in the vehicle body, and the host is provided with a central control circuit, a battery management circuit, a video signal acquisition circuit, an LED screen drive circuit, a storage circuit, an ultrasonic detection circuit, a speaker drive circuit, an external control circuit, and a vehicle speed detection circuit. circuit; the central control circuit is respectively connected with the power supply and battery management circuit, video signal acquisition circuit, LED screen drive circuit, storage circuit, ultrasonic detection circuit, speaker drive circuit, external control circuit and vehicle speed detection circuit;

The camera is electrically connected to the video signal acquisition circuit; the ultrasonic probe is electrically connected to the ultrasonic detection circuit; the speaker is electrically connected to the speaker driving circuit; the LED display is electrically connected to the LED screen driving circuit; the vehicle speed sensor is electrically connected to the vehicle speed detection circuit.

A method for realizing a side display early warning system of a large vehicle, the steps of which are as follows:

1) Install the host in the car, connect the host to the vehicle battery through the power cord, take power from the battery and charge the battery in the host through the power supply and battery management circuit;

2) Load the video file into the storage circuit through the external control circuit, after being decoded by the central control circuit, drive the LED display and the speaker through the LED screen drive circuit and the speaker drive circuit, and broadcast the signal in the video file;

3) When the vehicle is running, the system will keep playing the video. When the vehicle speed detection circuit detects that the vehicle has decelerated and the vehicle speed is lower than the threshold of 20 km/h, the top camera, the front ultrasonic probe and the side ultrasonic probe will Start work, about to detect the surrounding environment of the vehicle through ultrasonic Doppler and digital image processing technology, and monitor pedestrians and vehicles in front or on both sides;

4) Once the top camera or the front ultrasonic probe detects that there is an object moving ahead, and the side ultrasonic probe detects that there is a vehicle on the side, it will immediately send a signal to the central control circuit. After the central control circuit makes a judgment, the central control circuit will send a signal to the central control circuit. The LED screen driving circuit and the loudspeaker driving circuit issue commands to drive the LED display screen and the loudspeaker to give video and audio alarms to vehicles on the side.

The advantages of the present invention are: firstly, the composite environment detection is carried out through the image recognition technology and ultrasonic waves, which ensures the reliability of the detection results. Secondly, audio and video multimedia warnings are used to increase the probability of drivers avoiding risks. Finally, when the system is not in the alarm state, video advertisements can be played to increase utilization and avoid waste.

Description of drawings

Fig. 1 is a schematic diagram of the installation effect of the present invention; Fig. 2 is a circuit design block diagram of the present invention;

Fig. 3 is a central control circuit diagram of the present invention; Fig. 4 is a power supply and battery management circuit diagram of the present invention;

Fig. 5 is the video signal acquisition circuit diagram of the present invention; Fig. 6 is the LED screen driving circuit diagram of the present invention;

Fig. 7 is a memory circuit diagram of the present invention; Fig. 8 is an ultrasonic detection circuit diagram of the present invention;

Fig. 9 is a loudspeaker driving circuit diagram of the present invention; Fig. 10 is an external control circuit diagram of the present invention;

Fig. 11 is a vehicle speed detection circuit diagram of the present invention; Fig. 12 is a working flow chart of the present invention.

In the figure: 100. Host, 1. Vehicle body, 2. Camera, 3. Ultrasonic probe, 4. Vehicle speed sensor, 5. Speaker, 6. LED display, 7. Central control circuit, 8. Power supply and battery management circuit, 9. Video signal acquisition circuit, 10. LED screen drive circuit, 11. Storage circuit, 12. Ultrasonic detection circuit, 13. Speaker drive circuit, 14. External control circuit, 15. Vehicle speed detection circuit.

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments. Referring to Fig. 1 and shown in Fig. 2, a kind of large-scale vehicle side display early warning system comprises vehicle body 1, and camera 2 is equipped with on the front face of described vehicle body 1, and ultrasonic probe 3 is all equipped with in the front and side, side A speaker 5 and an LED display 6 are installed, and a vehicle speed sensor 4 is installed on the bottom surface; a host 100 is installed in the vehicle body 1, and a central control circuit 7, a battery management circuit 8, and a video signal acquisition circuit 9 are arranged in the host 100 , LED screen drive circuit 10, storage circuit 11, ultrasonic detection circuit 12, speaker drive circuit 13, external control circuit 14 and vehicle speed detection circuit 15; central control circuit 7 is connected with power supply and battery management circuit 8, video signal acquisition circuit 9, LED screen driving circuit 10, storage circuit 11, ultrasonic detection circuit 12, loudspeaker driving circuit 13, external control circuit 14 and vehicle speed detection circuit 15 are connected; camera 2 is electrically connected with video signal acquisition circuit 9; ultrasonic probe 3 is connected with ultrasonic detection circuit 12 is electrically connected; the speaker 5 is electrically connected to the speaker drive circuit 13; the LED display 6 is electrically connected to the LED screen drive circuit 10; the vehicle speed sensor 4 is electrically connected to the vehicle speed detection circuit 15.

As shown in Figure 3, the central control circuit 7 is a single-chip microcomputer quasi-system composed of AT89S52 and its auxiliary circuits. The oscillator circuit is composed of the crystal oscillator XTAL and two 30PF capacitors. The charging and discharging of the capacitors and buttons can constitute a power-on reset. There are two reset methods, button reset and LM1117-3.3V and LM1117-2.5V step-down regulator chips, which can convert 5V to 3.3V and 2.5V to meet the voltage requirements of some circuits.

As shown in FIG. 4 , the power supply and battery management circuit 8 is based on TP4057 as the main control chip, and TP4057 can work with USB power supply and adapter power supply. An external sense resistor and blocking diode are not required due to the internal PMOSFET architecture, plus anti-charge circuitry. Thermal feedback regulates charge current to limit die temperature during high power operation or high ambient temperature conditions. The charging voltage is fixed at 4.2V, while the charging current can be programmed externally with a single resistor. When the charge current drops to 1/10 of the set value after reaching the final float voltage, the TP4057 will automatically terminate the charge cycle. The MC34063 chip itself contains a monolithic control circuit of the main functions required by the DC/DC converter and is cheap. It is composed of a reference voltage generator with automatic temperature compensation function, a comparator, an oscillator with controllable duty ratio, an R-S flip-flop and a large current output switching circuit, etc. The device can be used in the control core of boost converter, buck converter and inverter, and the DC/DC converter formed by it only needs a small amount of external components. It is mainly used in systems based on microprocessors (MPUs) or single-chip microcomputers (MCUs). In the power supply and battery management circuit, the red light indicates that it is not fully charged, and the green light indicates that it is fully charged.

As shown in Figure 5, the video signal acquisition circuit 9 is based on Qualcomm AR9331 as the main control chip. AR9331 is a highly integrated, low-cost IEEE 802.11n 1*1 MIMO WiFi SoC, suitable for low-end wireless routers, wireless APs and other products. AR9331 uses a MIPS 24Kc core (which is very similar to Mediatek RT3352), integrates a five-port 100M Ethernet switch, a USB 2.0 interface, and a DDR/DDR2 controller. A single chip can realize a complete wireless router product. Real-time video transmission can be realized by adding peripheral circuit with AR9331.

As shown in FIG. 6 , the LED screen driving circuit 10 selects a channel through 74F138 and connects the triode to give the LED enough driving current to light it up. 74F138 is a high-speed 38 decoder. Compared with 74LS138, 74F138 has higher speed. When the output port of 74F138 is selected, the port outputs a low level, and the triode is turned on and the selected LCD screen is lit.

As shown in Figure 7, the storage circuit 11 is a FLASH memory composed of M25P16. M25P16 is a 2M byte serial Flash memory with advanced write protection mechanism and high-speed SPI bus access. The main features of this memory are: 2M byte The storage space is divided into 32 sectors, each sector has 256 pages, and each page has 256 bytes; the time required to write 1 page of data is 1.4 ms (typical value); single block erasing and entire block erasing : 2.7 ~ 3.6 V single power supply voltage; SPI bus and 50 MHz data transmission clock frequency; each sector is guaranteed to erase and write 100,000 times, and the data retention period is at least 20 years. The device is ideal for the code and data storage needs of a variety of applications including all-in-one printers, PC motherboards, set-top boxes, CD and DVD players, digital TVs, digital cameras, graphics cards and flat-panel displays. Among them, Q outputs serial data, D inputs serial data, C serial clock inputs, HOLD control terminal, W write protection.

As shown in FIG. 8 , the ultrasonic detection circuit 12 directly uses the URM37 ultrasonic ranging module. Ultrasonic sensors are sensors that convert ultrasonic signals into other energy signals, usually electrical signals. Ultrasound is a mechanical wave with a vibration frequency higher than 20KHz. It has the characteristics of high frequency, short wavelength, small diffraction phenomenon, especially good directionality, and can become ray and directional propagation. Ultrasound has a great penetrating ability to liquids and solids, especially in solids that are opaque to sunlight. Ultrasonic waves will produce significant reflections when they encounter impurities or interfaces to form echoes, and when they encounter moving objects, they will produce Doppler effects.

As shown in FIG. 9 , the speaker driving circuit 13 receives a signal from the single-chip microcomputer through the voice chip WTV040 to drive the speaker to alarm. WTV series voice chip is a powerful one-time programming voice chip. When the voice is 6K sampling frequency, the storage length can reach 10 seconds, 20 seconds, 40 seconds, 80 seconds, 170 seconds, 340 seconds, and the audio output is PWM. or DAC mode. Optional control modes include key control mode, key combination control mode, parallel port control mode, serial port control mode, etc. The trigger mode of the button control mode is flexible; in the serial port mode, the volume can be controlled, the power amplifier can be turned on or off, and there are loop playback and stop functions.

As shown in FIG. 10 , the external control circuit 14 is composed of four buttons of the vehicle speed detection circuit and an encoder, which can use fewer IO ports to cooperate with more control functions.

As shown in Figure 11, the vehicle speed detection circuit 15 is to detect the vehicle speed by the Hall sensor, and store it in the AT24C02 after being processed by the single-chip microcomputer through the signal preprocessing circuit. Hall sensors can be divided into their applications according to the nature of the detected object: direct application and indirect application. The former is to directly detect the magnetic field or magnetic properties of the detected object itself, and the latter is to detect the artificially set magnetic field on the detected object, and use this magnetic field as the carrier of the detected information. Through it, many non-electric, non-magnetic Physical quantities such as force, torque, pressure, stress, position, displacement, velocity, acceleration, angle, angular velocity, revolutions, rotational speed, and the time when the working state changes, etc., are converted into electricity for detection and control.

As shown in Figure 12, according to the work flow diagram of the present invention, it can be seen that after the system starts to work, it is first judged whether the speed of the vehicle is less than 20 km/h: if it is greater than, the stored video is called, and the central control circuit decodes and drives the LED, screen and speaker Play; if the speed of the vehicle is less than 20 km/h, it will enter the recognition state, and judge whether there is an object in front and side of the vehicle through ultrasonic waves and cameras. .

Its working steps of the present invention are as follows:

The first step is to install the system inside and outside the vehicle, connect the host 100 to the battery of the vehicle through the power cord, take power from the battery and charge the battery in the host 100 through the power supply and battery management circuit 8 .

In the second step, the advertisement video file is loaded into the storage circuit 11 through the external control circuit 14, and after being decoded by the central control circuit 7, the LED display screen 6 and the loudspeaker 5 are driven by the LED screen drive circuit 10 and the speaker drive circuit 13, and the advertisement The video plays.

In the third step, when the vehicle is running, the system will always keep the advertisement playing state. When the vehicle speed detection circuit 15 detects that the vehicle is decelerating and the vehicle speed is lower than the threshold of 20 km/h, the top camera 2, the front ultrasonic probe 3 and the side Ultrasonic probe 4 starts working, and they will detect the surrounding environment of the vehicle through ultrasonic Doppler and digital image processing technology, monitor whether there are other vehicles or pedestrians crossing from the front, and monitor whether there are other vehicles on both sides of the vehicle.

In the fourth step, once the top camera 2 or the front ultrasonic probe 3 detects that there is an object moving ahead, and the side ultrasonic probe 4 detects that there is a vehicle on the side, it will immediately send a signal to the central control circuit 7 and make a judgment through the central control circuit 7 Afterwards, the central control circuit 7 sends commands to the LED screen drive circuit 10 and the speaker drive circuit 13 to drive the LED display screen 6 and the speaker 5 to carry out video and audio alarms to the side vehicles, thereby reminding the side vehicles to avoid accidents.

Claims (2)

1. A side display early warning system for a large vehicle, comprising a vehicle body, characterized in that a camera is installed directly above the front face of the vehicle body, ultrasonic probes are installed on the front and sides, and speakers and LED display screens are installed on the sides , the bottom surface is equipped with a vehicle speed sensor; A host is installed in the vehicle body, and the host is provided with a central control circuit, a battery management circuit, a video signal acquisition circuit, an LED screen drive circuit, a storage circuit, an ultrasonic detection circuit, a speaker drive circuit, an external control circuit, and a vehicle speed detection circuit. circuit; the central control circuit is respectively connected with the power supply and battery management circuit, video signal acquisition circuit, LED screen drive circuit, storage circuit, ultrasonic detection circuit, speaker drive circuit, external control circuit and vehicle speed detection circuit; The camera is electrically connected to the video signal acquisition circuit; the ultrasonic probe is electrically connected to the ultrasonic detection circuit; the speaker is electrically connected to the speaker driving circuit; the LED display is electrically connected to the LED screen driving circuit; the vehicle speed sensor is electrically connected to the vehicle speed detection circuit. 2. A method for realizing the large-scale vehicle side display warning system according to claim 1, wherein the steps are as follows: 1) Install the host in the car, connect the host to the vehicle battery through the power cord, take power from the battery and charge the battery in the host through the power supply and battery management circuit; 2) Load the video file into the storage circuit through the external control circuit, after being decoded by the central control circuit, drive the LED display and the speaker through the LED screen drive circuit and the speaker drive circuit, and broadcast the signal in the video file; 3) When the vehicle is running, the system will keep playing the video. When the vehicle speed detection circuit detects that the vehicle has decelerated and the vehicle speed is lower than the threshold of 20 km/h, the top camera, the front ultrasonic probe and the side ultrasonic probe will Start work, about to detect the surrounding environment of the vehicle through ultrasonic Doppler and digital image processing technology, and monitor pedestrians and vehicles in front or on both sides; 4) Once the top camera or the front ultrasonic probe detects that there is an object moving ahead, and the side ultrasonic probe detects that there is a vehicle on the side, it will immediately send a signal to the central control circuit. After the central control circuit makes a judgment, the central control circuit will send a signal to the central control circuit. The LED screen driving circuit and the loudspeaker driving circuit issue commands to drive the LED display screen and the loudspeaker to give video and audio alarms to vehicles on the side.