CN107139836A - A kind of large-scale passenger-cargo carriage intelligent and safe warning device and method - Google Patents

Abstract

The invention discloses an intelligent safety alarm device and method for a large passenger and freight vehicle, comprising a control unit, a signal acquisition unit electrically connected to the control unit, a wireless communication unit, an execution unit, and a power supply module, wherein the power supply module supplies power to the whole set of devices. Then through the signal acquisition unit to collect the right steering movement of the passenger truck and road obstacles, the detection data is fed back to the control unit, after the control unit processes the feedback information, it drives the execution unit to give an audible and visual alarm, and the wireless communication unit is set to assist the driver in the cab In order to achieve timely alarm, and then through the set projection system, the light of the strobe light is projected to the ground to form a dangerous area to warn the driver. When the vehicle is turning right, the device continuously adjusts the dangerous area, thereby instructing the driver to drive safely and avoid large-scale A van turning right caused a traffic accident due to a blind spot in the field of vision.

Description

An intelligent safety alarm device and method for a large passenger and freight vehicle

technical field

The invention relates to the field of traffic safety, in particular to an intelligent safety alarm device and method for large passenger and freight vehicles.

Background technique

There is a common problem that can easily cause traffic accidents during vehicle driving. When the driver is in the driver's seat and drives normally, his sight will be blocked by the vehicle body or limited by the angle of the mirror, and there are always problems that cannot be directly observed. The area is called the blind area of vision. Due to the large volume, long wheelbase, limited display angle range of mirrors, and larger blind spots than small cars, large trucks are prone to traffic accidents in which pedestrians are drawn into the bottom of the vehicle and cause casualties when turning right.

In the patent No. ZL201220000139.2, a side anti-collision alarm device based on the right turn of the car provides an alarm device, which can detect obstacles through the side anti-collision alarm device installed on the body when the car turns right objects, and then send out an alarm sound and light to remind the driver to avoid installing obstacles or pedestrians due to blind spots when the car turns right. Although this blind spot monitoring device can prompt the driver that there is an obstacle on the right side that needs attention, it cannot give any instructions to the driver on driving, which can easily cause the driver to be nervous and force the driver to get out of the car to check.

Contents of the invention

The purpose of the present invention is to provide an intelligent safety alarm device and method for a large passenger truck, which can not only detect pedestrians or obstacles when the large passenger truck turns right, but also provide an alarm that can be installed from the right side of the vehicle body. The light is projected from the device, and a dangerous area is displayed on the ground, thereby instructing the driver to avoid driving in the dangerous area and achieve safe driving.

The present invention is realized through the following technical solutions: an intelligent safety alarm device for large passenger and freight vehicles includes an alarm device body, a control unit, a signal acquisition unit electrically connected to the control unit, a wireless communication unit, an execution unit, and a power supply module.

The control unit includes a single-chip processor and the single-chip processor is set and inside the alarm device body, and is used to receive the data collected by the signal acquisition unit and send control instructions to the execution unit after processing, wherein the single-chip microcomputer adopts STC89C52, and the STC89C52 single-chip microcomputer adopts the compilation of C language The environment has a wide range of applications, and the input control program is simple and easy to use.

The signal acquisition unit includes an infrared dual-inspection detector and a six-axis sensing module. The infrared dual-inspection detector is a passive infrared plus microwave detector, which is arranged on the surface of the alarm device body and is electrically connected to the single-chip processor. It is used to detect human body movement or obstacles; the six-axis sensing module includes a six-axis sensor and a signal modulation circuit, the six-axis sensor is arranged inside the alarm device body and is electrically connected to the single-chip processor through the signal modulation circuit, and is used to detect vehicles Right turn action.

The wireless communication module includes a transmitting and receiving antenna and a signal transmitting and receiving device, the transmitting and receiving antenna is arranged on the top of the alarm device body, the wireless communication module is arranged inside the alarm device body and is electrically connected with the single-chip processor, and is used for wireless communication external equipment, remote receiving Alarm information and processing alarm information.

The execution unit includes a projection system and an alarm system, the projection system includes a strobe light arranged on the surface of the alarm device body, a controllable baffle, and a steering gear installed inside the alarm device body and connected to the controllable baffle, and the rudder The driver and the strobe light are electrically connected to the single-chip processor through the driving circuit, which is used to assist the alarm system to perform flash alarms and project dangerous areas. The driving circuits here refer to the steering gear driving circuit and the strobe light driving circuit respectively.

In order to better realize the present invention, further, the projection system will automatically project a light forming area to the ground after the signal acquisition unit detects an obstacle, and the projected area is a dangerous area to assist the driver to drive normally and complete the right turn of the vehicle Get out of the danger zone.

In order to better realize the present invention, further, the dangerous area will change with the movement of the vehicle. During the process of the vehicle turning right, the infrared double-detection detector is used to continuously collect the road conditions combined with the six-axis sensing module to detect the vehicle turning right. The action data is transmitted to the single-chip processor in real time. After the single-chip processor processes the data, it drives the steering gear to control the controllable baffle to block the strobe light so as to continuously adjust the projection area to instruct the driver to safely drive out of the dangerous area.

In order to better realize the present invention, further, the alarm system is a sound alarm module, which includes a high-decibel horn and the high-decibel horn is installed on the surface of the alarm device body, and the strobe light can assist the alarm while performing the sound alarm. Thereby achieving sound and light alarm, making the alarm more eye-catching, and more able to attract the attention of drivers or pedestrians.

In order to better realize the present invention, further, the wireless communication module is any one of a Bluetooth module, a ZIGBEE module, and a WIFI module, and one of them can be selected according to information transmission requirements.

In order to better realize the present invention, further, the power module includes a power switch button, a power switch circuit, and a power supply, and the power switch circuit is respectively connected to the power switch button, the power supply, and the single-chip processor, wherein the power supply is a lithium battery And it can be charged and disassembled.

In order to better realize the present invention, further, the controllable baffle is made of reflective material, which can reflect the light of the strobe light to the ground, wherein the reflective material is selected from a material with a high reflectivity. Plated reflective film.

In order to better realize the present invention, further, the strobe light is a volt flash type strobe light.

In order to better realize the present invention, further, the signal modulation circuit includes a voltage regulator chip RT9193-33 and a six-axis sensor chip MPU6050, and the NC pin 5 of the MPU6050 is connected to the MPU AD0 of the RT9193-33.

In order to better realize the present invention, further, the external device can be a mobile device with a display function such as a mobile phone, a tablet computer, a notebook, etc., which can be used to receive alarm information, and further remind the driver in the cab of an emergency situation, It is also possible to send an instruction to the control unit through an external device to stop the alarm.

An intelligent security alarm method for a large van, comprising the following steps:

Step S1: the acquisition unit collects road surface information when the large van turns right;

Step S2: The collected information is fed back to the control unit for comparison and judgment processing;

Step S3: After it is determined that there is an obstacle in the right-turn area, the alarm device issues an audible and visual alarm to remind the driver and pedestrians;

Step S4: The projection system of the alarm device projects the dangerous area through the light on the ground to remind the driver to drive carefully;

Step S5: As the large van turns right, the alarm device with the six-axis sensor adjusts the size of the dangerous area until the right turn ends, the dangerous area disappears, and the alarm ends.

In order to better realize the present invention, further, in the step S1, the acquisition unit detects whether there is human body movement or obstacles by collecting human body infrared radiation and microwave reflection.

In order to better realize the present invention, further, in the step S5, the alarm device adjusts the dangerous area specifically through the following steps:

Step S51: the six-axis sensing module installed in the alarm device detects the inclination angle of the large van when turning right;

Step S52: Control the processor in the control unit to receive and calculate the tilt angle data;

Step S53: After processing the tilt angle data, the processor outputs a PWM signal corresponding to control the steering gear, and then controls the steering gear. The baffle reflects the light of the strobe light to the ground to form a dangerous area, and the area of the dangerous area can be controlled due to the expansion and contraction of the controllable baffle.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

(1) The six-axis sensor combined with the three-axis accelerometer and the three-axis gyroscope senses the vehicle turning right, the three-axis accelerometer senses the acceleration in the X/Y/Z axis, and the three-axis gyroscope senses the left and right tilt, front and rear respectively The all-round dynamic information of tilt and left and right swing, and then calculate and process the data collected by the six-axis sensor through the single-chip computer to analyze the angle of the vehicle's right turn, and then drive the steering gear to control the expansion and contraction of the controllable baffle. The expansion and contraction of the controllable baffle can The strobe lights are refracted to the ground to form a variable area, which is a dangerous area. The size of the dangerous area can be adjusted according to the right turn angle, and then the driver can be reminded to avoid the dangerous area effectively.

(2) By adopting infrared dual detectors, the detector is a dual detector combined with passive infrared and microwave, which not only has the reliability of microwave detectors and the advantages of being independent of heat sources, but also integrates passive infrared detectors without lighting and Brightness requirements and the characteristics of day and night operation can accurately detect obstacles and pedestrians, greatly reducing the false alarm rate.

(3) The alarm system has a strobe light assisted by a high-decibel speaker to realize an integrated sound and light alarm, and a controllable baffle is added to project the strobe light onto the ground to realize the warning function of the dangerous area on the ground. The strobe light adopts the volt flash type Strobe light, low power consumption, high luminous intensity, even when the sunlight intensity is strong, the light projection area on the ground is still clearly visible to instruct the driver to drive safely.

(4) By adding a wireless communication module, the alarm signal can be transmitted wirelessly to other external devices that can communicate wirelessly, so that the driver can also receive the alarm information in the cab, which further plays the role of alarm reminder, and can A control instruction is wirelessly sent to the control unit by an external device to close the alarm device.

Description of drawings

Fig. 1 is a functional block diagram of the present invention.

Fig. 2 is a specific functional block diagram of the present invention.

Fig. 3 is a structural schematic diagram of the intelligent alarm device of the present invention.

Fig. 4 is a sectional view of the intelligent alarm device of the present invention

FIG. 5 is a schematic diagram of the projection area of the projection system.

FIG. 6 is a schematic diagram of an enlarged projection area.

Figure 7 is a schematic diagram of the steering gear control circuit.

Figure 8 is a schematic diagram of the circuit of the six-axis sensing module.

Figure 9 is a working flow chart of the six-axis sensing module.

Among them, 1. Projection system; 2. Sound alarm module; 3. Control unit; 4. Transceiver antenna; 5. Controllable baffle; 6. Strobe light; 7. Steering gear; Switch button; 10. Lithium battery; 11. Infrared double detector; 12. Single-chip processor; 13. Wireless communication module; 14. Six-axis sensing module.

detailed description

Example 1:

An intelligent security alarm device for a large van in this embodiment, as shown in Figure 1, mainly includes an alarm device body, a control unit 3, a signal acquisition unit electrically connected to the control unit 3, a wireless communication unit, an execution unit, The power supply module, in which the wireless communication unit communicates wirelessly with external equipment, its working principle is: the power supply module supplies power to the whole device, and then collects the right steering movement of the passenger truck and road obstacles through the signal acquisition unit, and feeds back the detection data to the control unit 3. After the control unit 3 processes the feedback information, it drives the execution unit to give an audible and visual alarm, and the set wireless communication unit assists in reminding the driver in the cab to achieve a timely alarm, and then projects the light onto the ground through the set projection system 1 to warn the driver danger zone.

Specifically, as shown in Fig. 2, Fig. 3 and Fig. 4: the control unit 3 includes a single-chip processor 12 and the single-chip processor 12 is arranged inside the alarm device body, used to receive the data collected by the signal acquisition unit and send it after processing The control instruction is given to the execution unit; the signal acquisition unit includes an infrared dual-inspection detector 11 and a six-axis sensing module 14, and the infrared dual-inspection detector 11 is a passive infrared plus microwave detector, which is arranged on the surface of the alarm device body and It is electrically connected with the single-chip processor 12 for detecting human body movement or obstacles; the six-axis sensor is arranged inside the alarm device body and electrically connected with the single-chip processor 12 for detecting the right turn of the vehicle; the wireless The communication module 13 includes a transceiver antenna 4 and a signal transceiver device, the transceiver antenna 4 is arranged on the top of the alarm device body, the wireless communication module 13 is arranged inside the alarm device body and is electrically connected with the single-chip processor 12, and is used for wireless communication external equipment, Remotely receive alarm information and process alarm information; the execution unit includes a projection system 1 and an alarm system, and the projection system 1 includes a strobe light 6 arranged on the surface of the alarm device body, a controllable baffle 5 and a The steering gear 7 connected to the controllable baffle 5 inside, and the steering gear 7 and the strobe light 6 are electrically connected to the single-chip processor 12 through the driving circuit, and are used for the auxiliary alarm system to perform flashing alarms and project dangerous areas.

Example 2:

This embodiment is further optimized on the basis of Embodiment 1. After the signal acquisition unit detects an obstacle, the projection system 1 will automatically project a light forming area to the ground. The projected area is a dangerous area to assist the driver to drive normally. Make a right turn to exit the danger zone.

The dangerous area will change with the movement of the vehicle. During the right turn process of the vehicle, the infrared dual detector 11 continuously collects the road surface conditions combined with the six-axis sensor module 14 to detect the data of the vehicle's right turn action, and transmits real-time data to the single chip microcomputer. Processor 12, single-chip processor 12 processes the data and then drives the steering gear 7 to control the controllable baffle 5 to block the strobe light 6 so as to constantly adjust the projected area to instruct the driver to safely drive out of the dangerous area.

Described alarm system is sound alarm module 2, comprises high-decibel loudspeaker 8 and high-decibel loudspeaker 8 is installed on the surface of alarm device body, while carrying out sound alarm, strobe light 6 can auxiliary alarm, thereby reaches sound and light alarm, makes The alarm indication is more eye-catching and can attract the attention of drivers or pedestrians.

Described strobe light 6 is a volt flash type strobe light, adopts volt strobe type strobe light, has low power consumption and high luminous intensity, even when the sunlight intensity is very strong, the light projection area on the ground is still clearly visible.

Described wireless communication module 13 is any one in bluetooth module, ZIGBEE module, WIFI module, can select one of them according to information transmission demand, minimum configuration is bluetooth module, and the transmission distance of bluetooth module is about 10m, and driver does not In the case of leaving the cab, the communication will not be affected at all, and the information transmission is stable, the network response is fast, the cost is not high, and the use is simple. If there is a requirement for communication distance, you can choose WIFI or ZIGBEE module to realize long-distance transmission of information.

Described power supply module comprises power switch button 9, power switch circuit and power supply and power switch circuit is connected with power switch button 9, power supply, single-chip processor 12 respectively, and wherein power supply is lithium battery 10 and can charge and disassemble, can The 12-volt lithium battery that supplies power to the device alone is easy to use and can be small in size without taking up more space.

The controllable baffle 5 is made of reflective material, which can reflect the light of the strobe light 6 to the ground. The higher the reflective rate of the reflective material, the better, and if necessary, it can be coated with a reflective film to enhance the reflective rate.

The external device can be a mobile device with a display function such as a mobile phone, a tablet computer, a notebook, etc., and the alarm information can be displayed on the display screen, and an instruction to stop the alarm can be sent to the alarm device to release the alarm state.

The signal modulation circuit includes a stabilizer chip RT9193-33 and a six-axis sensor chip MPU6050, and the NC pin 5 of the MPU6050 is connected to the RT9193-33 and the MPU AD0.

Example 3:

An intelligent safety alarm device for large passenger and truck vehicles in this embodiment, wherein the schematic diagram of the circuit in the six-axis sensing module 14, that is, the signal modulation circuit, is shown in Figure 8: the signal modulation circuit includes a voltage regulator chip RT9193-33 and six Shaft sensor chip MPU6050, and NC pin 5 of MPU6050 is connected to MPU AD0 of RT9193-33. Its connection relationship with the microcontroller is: SCL and SDA are the IIC interfaces connected to the microcontroller processor. The microcontroller processor controls the MPU6050 through this IIC interface. There is also an IIC interface: AUX_CL and AUX_DA. This interface can be used to connect external slave devices. Such as magnetic sensors. VLOGIC is the voltage of the IO port, the pin can be as low as 1.8V, we usually connect it directly to VDD. AD0 is the address control pin connected to the microcontroller processor from the IIC interface, and this pin controls the lowest bit of the IIC address. If it is connected to GND, the IIC address of MPU6050 is: 0X68, if it is connected to VDD, it is 0X69, the address here does not include the lowest bit of data transmission, because the lowest bit is used to indicate reading and writing.

The working process of the six-axis sensing module 14 is shown in Figure 9: first, the sensor is initialized, which is to restore all registers inside the MPU6050 to default values, which is realized by writing 1 to bit7 of the power management register 0X6B. After reset, the power management register 1 restores the default value 0X40, and then this register must be set to 0X00 to wake up the MPU6050 and enter the normal working state.

The data of the X-axis and Y-axis is collected by the angular velocity sensor (gyroscope) and the acceleration sensor arranged at the front end, and the data is stored in the memory. Then enable the angular velocity sensor and acceleration sensor by setting the system clock source. Here, the SCL clock is used for judgment, which is also set through the power management register 1 (0X1B). The lowest three bits of this register are used to set the system clock source selection. Then read the output value of the MPU6050 accelerometer, remove the zero drift, calculate the angle (radian) through the built-in arithmetic processor, and convert the radian into degrees. Read the output value of the MPU6050 gyroscope, remove the zero drift, calculate the angular velocity, and calculate the angle value by integrating the angular velocity. Finally, the obtained angle and angular velocity are input into the Kalman filter for filtering, and after filtering, the inclination angle of the vehicle when turning right is calculated.

Example 4:

This embodiment further details the working principle of the projection system on the basis of the calculation of the inclination angle of the vehicle when the vehicle turns right through the six-axis sensing module 14 in embodiment 3. In conjunction with Fig. 5 and Fig. 6, it is explained: when the vehicle enters the right road Make, start to turn right, the six-axis sensor collects the position data of the car turning right, and transmits the data to the single-chip microcomputer, and the single-chip microcomputer calculates the range of the inner wheel difference after processing by the internal algorithm, and then outputs the range of the inner wheel difference after further processing as PWM steering gear control signal, it is known that the rotation position of the steering gear is realized by controlling the duty ratio of the PWM (pulse width modulation) signal, so the steering angle of the steering gear 7 is adjusted through the generated PWM steering gear control signal, because The steering gear 7 is connected with the baffle through gears, and then the front and rear movement of the baffle can be adjusted. Because the length of the controllable baffle 5 is 17.2cm, the installation height of the device is 2.2m to 3.0m, so that the minimum width of the projection area is 17.2cm, and the maximum width is much larger than the width of the inner wheel differential. The minimum length of the projection area can be 0m, and the area of the projection area can be changed at will. If the baffle moves forward, the projection area will increase, and if it moves backward, the projection area will decrease. The projection area is determined by Composed of two semicircles and a rectangle, the proportional relationship between the area of the projected area and the forward and backward movement of the baffle can be calculated, and then the approximate calculation method of the inner wheel difference, inner wheel difference = steering angle * wheelbase of the front and rear wheels * 0.01, calculate Find out the size of the inner wheel difference at this time, and finally control the forward and backward movement distance of the baffle according to the size of the inner wheel difference. As the car turns right, the projected area rotates, and the projected range changes continuously. The final total projected range is the same as the inner wheel difference in the figure. The size of the area is similar, and the projection range is a red area, which can warn pedestrians and drivers to stay away from the area.

Example 5:

A kind of intelligent security alarm device for large passenger and freight vehicles in this embodiment, the working principle of its infrared dual-recognition detector 11 is: after the circuit is powered on, the single-frequency amplitude signal generated by the microwave oscillation circuit is transmitted to the space by the external antenna , to generate a three-dimensional space microwave protection zone, and the antenna can also receive the echo at the same time. The reflected microwave signal is mixed with the frequency of the original signal to generate a weak frequency shift signal. The signal is amplified by the amplifier and sent to the amplitude comparator. After comparison, the detection signal with a certain intensity is converted into a different amplitude Pulse output to determine whether there are obstacles or pedestrians in the detected area.

The pyroelectric human body infrared sensor detects the change of infrared energy radiated by the human body, and uses the principle that two interference signals with opposite polarities and equal magnitudes cancel each other out internally to compensate the sensor. When the infrared ray radiates to the sensor, the pyroelectric sensor Through the Fresnel lens installed in front of the sensor, it is focused and added to the two detection elements, so that the sensor outputs a voltage signal, and the signal is processed by filtering, amplification delay, comparison, etc. When the ambient temperature is close to the human body temperature , In order to reduce false positives, a temperature detection circuit is added. Finally, the infrared and microwave detector signals are input to an OR gate, and the input is considered to be a valid signal when both are low, so that only when they are all low, the low level will be output to achieve the effect of common detection.

The driving circuit of the steering gear 7 is shown in Figure 7: when the power supply voltage of 7.2V is connected, a peripheral voltage conversion circuit is required to convert the power supply voltage to the working voltage of the steering gear 7 of 6 V, and the LM2596 current output step-down switch is used to integrate The voltage regulator chip has good linearity and load regulation characteristics. The adjustable version can output various voltages less than 37V, and can realize the oscillation frequency error within ±15%; it can use only 80μA standby current to realize external Power off, and has a self-protection circuit, which greatly simplifies the design of the switching power supply circuit, the current is rectified by a rectifier diode, and finally outputs a voltage of 6V to the PWM, and the steering angle of the steering gear 7 is adjusted by controlling the PWM output .

Embodiment 6:

The specific working process of the intelligent safety alarm method for large passenger and truck vehicles in this embodiment is as follows: first install the safety alarm device on the right side of the vehicle, turn on the switch to allow the power to supply power to the equipment, and when the six-axis sensor detects that the vehicle turns right , the strobe light 6 is lit immediately and the infrared dual-approval detector 11 is opened immediately, and the light is projected onto the ground through the controllable baffle 5, so as to show the dangerous range, which is a red area, which can warn pedestrians and drivers to stay away In this area, the six-axis sensor transmits the detected car right-turn orientation data to the single-chip processor 12, and the single-chip processor 12 controls the steering angle of the steering gear 7 through program setting, and then adjusts the front and rear movement of the controllable baffle 5, thereby Change the range of the projected light on the ground. When the infrared double detector 11 detects that there is an obstacle in the dangerous area, it will trigger a high-decibel horn sound alarm, and the strobe light 6 will keep flashing and alarming. At the same time, the wireless communication module will send an alarm to the external device. signal, and can control its alarm through external equipment, when avoiding obstacles, just turn off the sound alarm and strobe light 6 to stop flashing, and continue to project the dangerous range to the ground until it detects that the right turn ends and closes the detection and stops projection.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications and equivalent changes made to the above embodiments according to the technical essence of the present invention all fall within the scope of the present invention. within the scope of protection.

Claims (10)

1. An intelligent safety alarm device for a large passenger and truck, including an alarm device body, characterized in that it also includes a control unit (3) and a signal acquisition unit, a wireless communication unit, and an execution unit electrically connected to the control unit (3). , power module; The control unit (3) is a single-chip processor (12) for receiving data collected by the signal acquisition unit and sending control instructions to the execution unit after processing, and the single-chip processor (12) is arranged inside the alarm device body; The signal acquisition unit includes an infrared dual-identification detector (11) for detecting human body movement or obstacles and a six-axis sensing module (14) for detecting the right turn of the vehicle; the infrared dual-identification detector (11 ) is a passive infrared/microwave detector, which is arranged on the surface of the alarm device body and is electrically connected to the single-chip processor (12); the six-axis sensing module (14) includes a six-axis sensor and a signal modulation circuit, and the six-axis sensor It is arranged inside the alarm device body and is electrically connected to the single-chip processor (12) through a signal modulation circuit; The wireless communication module (13) includes a transceiver antenna (4) for receiving and transmitting wireless signals and a signal transceiver device for processing wireless signals. The transceiver antenna (4) is arranged on the top of the alarm device body, and the wireless communication module ( 13) It is arranged inside the alarm device body and is electrically connected to the single-chip processor (12); The execution unit includes a projection system (1) and an alarm system. The projection system (1) includes a strobe light (6) arranged on the surface of the alarm device body, a controllable baffle (5) and a The steering gear (7) connected to the controllable baffle (5), and the steering gear (7) and the strobe light (6) are respectively electrically connected to the single-chip processor (12) through a driving circuit. 2. An intelligent safety alarm device for large vans according to claim 1, characterized in that: the controllable baffle (5) is arranged outside the strobe light (6), and is used to control the controllable baffle The telescoping servo (7) is connected to the plate (5). 3. An intelligent safety alarm device for large passenger and truck vehicles according to claim 2, characterized in that: the controllable baffle (5) is made of reflective material. 4. An intelligent safety alarm device for large passenger and truck vehicles according to claim 1, characterized in that: the strobe light (6) is a volt strobe type strobe light. 5. An intelligent safety alarm device for large passenger trucks according to claim 1, characterized in that: the alarm system is a sound alarm module (2), and the sound alarm module (2) is installed on the surface of the alarm device body High-decibel horn (8). 6. An intelligent safety alarm device for large passenger trucks according to claim 1, characterized in that: the power module includes a power switch button (9), a power switch circuit and a power supply, and the power switch circuit is connected to the power switch button respectively. (9), the power supply and the single-chip processor (12) are connected, wherein the power supply is a detachable lithium battery (10) that can be repeatedly charged and discharged. 7. An intelligent security alarm device for large passenger and truck vehicles according to claim 1, characterized in that: the signal modulation circuit includes a voltage regulator chip RT9193-33 and a six-axis sensor chip MPU6050, and the NC pin 5 of the MPU6050 Connect with the MPU AD0 pin of RT9193-33. 8. An intelligent security alarm method for large vans, characterized in that: comprising the following steps: Step S1: the acquisition unit collects road surface information when the large van turns right; Step S2: The collected information is fed back to the control unit (3) for comparison and judgment processing; Step S3: After it is determined that there is an obstacle in the right-turn area, the alarm device issues an audible and visual alarm to remind the driver and pedestrians; Step S4: The projection system (1) of the alarm device projects the dangerous area through the light on the ground to remind the driver to drive carefully; Step S5: As the large van turns right, the alarm device with the six-axis sensor adjusts the size of the dangerous area until the right turn ends, the dangerous area disappears, and the alarm ends. 9 . The intelligent safety alarm method for large vans according to claim 8 , characterized in that: in the step S1 , the acquisition unit detects whether there is human body movement or obstacles by collecting human body infrared radiation and microwave reflection. 10. A kind of intelligent security alarm method for large passenger and truck according to claim 8, characterized in that: in said step S5, the alarm device adjusts the dangerous area specifically through the following steps: Step S51: the six-axis sensing module (14) installed in the alarm device detects the inclination angle of the large van when turning right; Step S52: controlling the processor in the control unit (3) to receive and calculate the tilt angle data; Step S53: The tilt angle data is processed by the processor and outputs a PWM signal corresponding to the steering gear (7), and then controls the steering gear (7). At the same time, the controllable baffle connected to the steering gear (7) (5) Expanding and moving with the rotation of the motor, the controllable baffle (5) reflects the light of the strobe light (6) to the ground to form a dangerous area, and the area of the dangerous area can be controlled due to the expansion and contraction of the controllable baffle (5).