CN205113137U - Brake warning system based on it is infrared - Google Patents

Abstract

The utility model provides an infrared-based brake reminder system, relates to the technical field of traffic safety, and comprises a first infrared emitting unit (1), a second infrared emitting unit (2), a camera (3), and a central processing unit (4) And the buzzer (5), the first infrared emitting unit (1) and the second infrared emitting unit (2) are installed at the rear of the car with a fixed distance, and the camera (3) is installed at the front of the car, so The central processing unit (4) receives and processes the infrared signal captured by the camera (3). The utility model installs two infrared emitting units with a fixed distance at the rear of the vehicle to transmit infrared signals to the rear of the vehicle at intervals. After the infrared signal is captured by the camera of the rear vehicle, the relative acceleration of the vehicle is measured through the processing of the infrared signal by the central processor. Determine whether the vehicles will collide, and remind the driver to brake within a safe distance, which can greatly reduce the probability of accidents.

Description

A Braking Reminder System Based on Infrared

technical field

The utility model relates to the technical field of traffic safety, in particular to an infrared-based brake warning system.

Background technique

At present, in the field of automobiles, safe driving of automobiles has become the focus of people's attention. Studies have shown that reminding the driver to respond within 1.5 seconds of a traffic accident can largely avoid the occurrence of traffic accidents. When the driver is distracted while driving, he will not pay attention to the distance from the vehicle in front, often causing rear-end collision accidents, especially dangerous at high speeds. Another is that under conditions of poor vision such as heavy fog or night, the driver cannot see clearly or distinguish whether the vehicle in front will collide with his own vehicle in time, and it is often too late to react. The utility model can remind the driver to brake within a safe distance, and can greatly reduce the probability of accidents.

Utility model content

The utility model proposes an infrared-based brake reminder system, which uses active infrared markers to measure vehicle distance and vehicle relative acceleration, and judges whether vehicles will collide according to the measured values, and reminds the driver to brake within a safe distance.

The technical scheme of the utility model is achieved in that:

A brake reminder system based on infrared, comprising a first infrared emitting unit, a second infrared emitting unit, a camera, a central processing unit and a buzzer, the first infrared emitting unit and the second infrared emitting unit are separated by a fixed distance The camera is installed at the rear of the vehicle and emits infrared signals to the rear of the vehicle; the camera is installed at the front of the vehicle to capture the infrared signals emitted from the rear of the vehicle in front; the central processing unit receives and processes the infrared signals captured by the camera.

Preferably, diffuse reflectors are provided outside the first infrared emitting unit and the second infrared emitting unit.

Preferably, the first infrared emitting unit and the second infrared emitting unit blink at an interval of 0.5S.

Preferably, the central processing unit is a 16-bit single-chip microcomputer.

Preferably, the central processing unit is a 32-bit single-chip microcomputer.

The beneficial effects of adopting the utility model are:

The utility model provides an infrared-based brake reminder system. By installing two infrared emitting units with fixed distances at the rear of the car, the infrared rays emitted by the infrared emitting units at the rear of the front car at intervals will be emitted by the front of the car while the car is running. The camera captures the real distance and the relative acceleration of the vehicle through the processing of the infrared signal by the central processor. According to the measured value, it is determined whether the vehicle will collide, and the driver is reminded to brake within a safe distance, which can greatly reduce accidents. The probability of , provides a strong support for the active safety of automobile driving.

Description of drawings

Fig. 1 is a structural block diagram of a vehicle distance measuring system based on infrared provided by the utility model;

Fig. 2 is a schematic diagram of the first infrared emitting unit and the second infrared emitting unit in the utility model;

Fig. 3 is the schematic diagram of ranging model in the utility model;

Fig. 4 is the imaging schematic diagram that distance between vehicles is d in the utility model;

FIG. 5 is a schematic diagram of imaging with a vehicle distance of L in the present invention.

In the figure, 1-first infrared emitting unit; 2-second infrared emitting unit; 3-camera; 4-central processing unit; 5-buzzer.

detailed description

Below in conjunction with the accompanying drawings and specific embodiments, the utility model is clearly and completely described.

As shown in Figure 1, the utility model provides a kind of vehicle distance measuring system based on infrared, comprises the first infrared emission unit 1, the second infrared emission unit 2, camera 3, central processing unit 4 and buzzer 5, the first An infrared emitting unit 1 and a second infrared emitting unit 2 are installed at the rear of the car at a fixed distance, powered by the vehicle power supply, and emit infrared signals to the rear of the vehicle; the camera 3 is installed at the front of the car to capture the infrared signals emitted by the rear of the vehicle in front ; The central processing unit 4 is installed inside the vehicle, powered by the vehicle power supply, and the central processing unit 4 accepts and processes the infrared signal captured by the camera.

Further, as shown in FIG. 2 , diffuse reflectors 6 are provided outside the first infrared emitting unit 1 and the second infrared emitting unit 2 .

Further, the first infrared emitting unit and the second infrared emitting unit blink at an interval of 0.5S.

Further, the central processing unit 4 is a 16-bit single-chip microcomputer or a 32-bit single-chip microcomputer.

As shown in Figure 3-5, the reminder method of the infrared-based brake reminder system, the specific steps are as follows:

1) Set safe acceleration a ₀ : preset the acceleration a ₀ for safe deceleration of the vehicle. According to common knowledge, it is generally believed that 50 meters is the safe distance for braking and decelerating when the speed of the car reaches 100 kilometers. Assuming that the car is moving at a uniform deceleration, the safe acceleration a ₀ =((100/3.6)^2-0^2)/(2*50)=7.71m/s^2, the value of safe deceleration acceleration a ₀ =7.71m/s^2 is stored in the central processing unit 4 middle;

2) Set the comparison table of vehicle distance values: in a static state, the distance between the first infrared emitting unit 1 and the second infrared emitting unit 2 is fixed at a meter, the focal length of the camera 3 is s, and the camera 3 is placed at a distance of first Infrared emitting unit 1 and the second infrared emitting unit 2 are d meters, and the distance between the first infrared emitting unit 1 and the second infrared emitting unit 2 of camera 3 imaging is b meters at this moment; The first infrared emitting unit 1 and the second infrared emitting unit 2 are L meters, and the distance between the first infrared emitting unit 1 and the second infrared emitting unit 2 of imaging at camera 3 is c meters now; according to the principle of similar triangles, draw L /d=b/c, according to this method, when the distance between the camera and the first infrared emitting unit 1 and the second infrared emitting unit 2 is 1 to 1000 meters, the first infrared emitting unit 1 and the second infrared emitting unit corresponding to the imaging of the camera 3 Unit 2 spacing forms a numerical comparison table, and the numerical comparison table is stored in the central processing unit 4;

3) Calculating the relative vehicle speed V: According to step 2), calculate the distance S ₁ between the two vehicles when the first infrared emitting unit and the second infrared emitting unit flash for the first time, after 0.5S, the first infrared emitting unit and the second infrared emitting unit When the transmitting unit flashes for the second time, the distance S ₂ between the two vehicles is calculated according to V ₁ = (S ₂ -S ₁ )/0.5, and the first time interval of 0.5S is calculated, the average relative speed of the two vehicles V ₁ ; 1S Afterwards, when the first infrared emitting unit and the second infrared emitting unit flash for the third time, the distance S ₃ between the two vehicles is calculated according to V ₂ =(S ₃ -S ₂ )/0.5, and the second time interval of 0.5S is calculated , the average relative speed V ₂ of the two vehicles;

4) Calculation of relative acceleration a: According to the average relative velocities V ₁ and V ₂ calculated in step 3), relative acceleration a=(V ₁ −V ₂ )/1 is obtained.

5) Compare the relative acceleration a calculated in step 4) with the set safe acceleration a ₀ in step 1). When a>a ₀ , the system determines that the vehicle behind can decelerate without any prompt; when a<a ₀ , The system judges that the rear vehicle will collide with the vehicle in front, and the central processing unit 4 controls the buzzer 5 to send an alarm to remind the driver to slow down in time.

Although the utility model has been disclosed as above with preferred embodiments, it is not intended to limit the utility model, and any person skilled in the art can utilize the method and technology disclosed above without departing from the spirit and scope of the utility model The content makes possible changes and modifications to the technical solution of the utility model. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model without departing from the content of the technical solution of the utility model shall be It belongs to the protection scope of the technical solution of the utility model.

Claims (5)

1. one kind based on infrared brake system for prompting, comprise the first infrared emission unit (1), the second infrared emission unit (2), camera (3), central process unit (4) and buzzer phone (5), it is characterized in that, described first infrared emission unit (1) and described second infrared emission unit (2) are arranged on automobile tail with constant spacing, launch infrared signal to rear view of vehicle; Described camera (3) is arranged on automotive front, catches the infrared signal that front vehicles afterbody is launched; Described central process unit (4) accepts and processes the infrared signal that described camera (3) catches.

2. according to claim 1 a kind of based on infrared brake system for prompting, it is characterized in that: described first infrared emission unit (1) and the second infrared emission unit (2) outside are provided with diffuse reflector (6).

3. according to claim 1 a kind of based on infrared brake system for prompting, it is characterized in that: described first infrared emission unit (1) and the second infrared emission unit (2) are with the interval flashing of 0.5S.

4. according to claim 1 a kind of based on infrared brake system for prompting, it is characterized in that: described central process unit (4) is 16 micro controller systems.

5. according to claim 1 a kind of based on infrared brake system for prompting, it is characterized in that: described central process unit (4) is 32 micro controller systems.