CN207902261U - A kind of automobile safety early-warning system - Google Patents

Abstract

The utility model discloses an automobile safety early warning system. The ultrasonic information collection system is used for monitoring the relative motion trend and relative position of objects around the vehicle; the A/D converter is used for processing the information of the ultrasonic collection system and then transmitting it to a main controller; The turn signal state detection device is used to judge the driver's action intention during the driving process of the vehicle; the parking detection system determines the state of the car by detecting the state of the brake pedal and handbrake so that the main controller selects the corresponding algorithm for calculation; the UPS power supply to the entire The system supplies power; the main controller calculates the input information to judge whether an alarm is required; the alarm system reminds the driver to pay attention to danger through physical information such as sound, light, and touch. The utility model can help drivers and passengers to discover dangerous situations in advance, can effectively reduce the possibility of collision accidents, and improve traffic safety problems; at the same time, the utility model can effectively eliminate useless dangerous information, avoid unnecessary alarms and distract drivers attention.

Description

A car safety warning system

technical field

The utility model relates to the technical field of automobile active safety, in particular to an automobile safety early warning system for automobile blind spots detected by ultrasonic radar.

Background technique

In the more than 100 years of automobile development history, the research on the safety performance of automobiles and the application of new technologies have also undergone rapid changes, from the initial bumper damping system, passenger seat belt system, airbag to automobile crash test, to wheel Anti-lock braking system (ABS), driving anti-skid system (ASR), no blind spot, no parallax safety rearview mirror and child seat system research, the safety performance of the car is becoming more and more perfect. Especially in recent years, with the rapid development of science and technology, more and more advanced technologies have been applied to automobiles. At present, all countries in the world are using modern high-tech to step up the development of automobile safety technology, and batches of cutting-edge technologies and new products related to automobile safety are successively installed and used in vehicles to make future automobiles safer.

The car blind spot warning system is a hot research direction in the current active safety of cars. The so-called car blind spot refers to the part of the area where the driver is located in the normal driving seat and his line of sight is blocked by the car body and cannot be directly observed. Automobile blind spots are also one of the main causes of traffic accidents. Although there are high-definition cameras on the market that can provide the driver to observe the blind spots of the car, the device is expensive and costly. It is only equipped on some high-end models, and the popularization and utilization rate is low.

For example, the Chinese utility model patent application with the application number 201610658590.6 discloses a driving warning system and method for driving in blind spots, including a pyroelectric infrared sensor group, a signal processing module, an A/D conversion module, a central processing module and an alarm module; The discharge infrared sensor group includes a plurality of pyroelectric infrared sensors, which are used to detect infrared information on the blind spot areas covered by each; the central processing module receives the data processed by the signal processing module and performs judgment processing. When there are people in the covered blind spot area and the engine is started, the central processing module drives the alarm module to give an alarm prompt. Although the device can provide early warning prompts for various blind spots of the car, the early warning objects are only people, and cannot effectively provide early warning for other types of obstacles. At the same time, it uses an infrared sensor, which has a short sensing distance, poor anti-interference ability, and low accuracy.

Another example is the Chinese utility model patent application with application number 201710245800.3, which discloses a multi-radar-based vehicle collision avoidance warning system and method. The system includes a vehicle battery, a control module, a radar module, a distance display module, a buzzer and an indicator The lights and control modules are connected to other modules respectively, and the radars are distributed on the front, rear, left and right sides of the vehicle body. This multi-radar based automobile anti-collision warning system and method installs a plurality of radars respectively in the front, rear, left, and right directions of the vehicle body, and respectively installs the doors, the air intake grille in front of the car and the bumper behind the car, and the sound warning and visual warning at the same time. But the radar distribution of this device is simple, has not carried out calculation and analysis, and cannot warn all car blind spots.

Based on the above analysis, the utility model aims to develop a low-cost and high-precision multi-ultrasonic radar detection vehicle safety early warning system. Realize the active safety of the car.

Utility model content

The purpose of the utility model is to provide an automobile safety early warning system in order to remedy the defects of the prior art.

The utility model is achieved through the following technical solutions:

A kind of automobile safety early warning system, comprises ultrasonic information collection system, A/D converter, turn signal state detection device, parking detection system, UPS power supply, master controller and warning system, described UPS power supply respectively to ultrasonic information Acquisition system, A/D converter, turn signal state detection device, parking detection system, main controller and alarm system are powered, the ultrasonic information acquisition system is connected with the A/D converter, and the A/D conversion device, turn signal state detection device, parking detection system, and alarm system are all connected to the main controller, and the ultrasonic information collection system monitors the relative motion trend and relative position of objects around the vehicle, and sends the collected information to A/ D converter and A/D converter process the information of the ultrasonic information collection system and transmit it to the main controller. The state of the car is determined by the state of the parking brake and the state of the handbrake. The main controller calculates the input information to determine whether an alarm is required; the alarm system receives the alarm signal and makes a corresponding alarm action.

The ultrasonic information collection system is composed of a plurality of ultrasonic radar sensors.

The ultrasonic information collection system consists of 14 ultrasonic radar sensors, of which three are evenly arranged on the front and rear bumpers of the car on the same horizontal line, and four are evenly arranged on the two sides of the car on the same horizontal line.

The turn signal state detection device is a through-beam photoelectric switch installed on the turn signal lever. When the turn signal lever is turned, the up and down position of the operating lever is judged by the through-beam photoelectric switch, and it is judged that it is a left turn. Still turn right.

The parking detection system includes a displacement sensor 1 installed on the handbrake handle and a displacement sensor 2 installed on the brake pedal. The displacement sensor judges the handbrake according to the increment or decrement of the displacement, and the output level is different. Level, to judge whether it is the brake state or the release state, wherein the main controller judges whether the handbrake is enabled through the signal output by the first displacement sensor; the main controller judges whether the brake pedal is enabled through the signal output by the second displacement sensor, and the two Combined to determine the parking state of the car.

The UPS power supply is a vehicle-mounted UPS power supply.

The model of the main controller is STM32F103V.

The alarm system is composed of three mutually independent alarm modules, namely an indicator light alarm module, a vibration alarm module and a buzzer alarm module. Among them, the indicator light alarm module is connected by an indicator light and the circuit. When there is a corresponding signal input, the module works, and the indicator light emits light to alarm; the vibration alarm module is connected by a vibration device and the circuit. When there is a corresponding signal input, the module works and vibrates. The device drives the seat to vibrate and alarm; the buzzer alarm module is connected with a circuit by a buzzer, and when a corresponding signal is input, the module works and the buzzer sounds an alarm. In this way, different danger types are judged through different warning methods, thereby prompting the driver to take corresponding warning measures. The alarm mode during driving is indicator light alarm and seat vibration alarm, and the alarm mode after parking is buzzer alarm.

The turn signal state detecting device judges the intention of the driver to drive the vehicle to turn the direction by monitoring the direction in which the turn signal of the vehicle is turned.

The parking detection system judges whether the car is in a parked state by detecting the state of the brake pedal and the handbrake, and then judges whether the main controller needs to change the calculation method.

The UPS power supply is a vehicle-mounted UPS power supply, which is used to supply power to the entire safety warning system to ensure the reliability of the system work.

The main controller receives the digital signal converted by the A/D converter, performs calculation processing, and calculates the approximate distance between the obstacle and the vehicle through an internally set calculation function, compares it with the set early warning threshold, and controls the alarm. The system takes corresponding actions. The main controller is electrically connected with the A/D converter and the alarm system.

The utility model has the advantages of:

(1) The utility model is equipped with ultrasonic radar sensors around the car, which can detect all blind spots of the driver, assist the driver's judgment, realize the active safety of the car, and reduce the occurrence of traffic accidents.

(2) The utility model adopts an ultrasonic radar sensor, which has a lower cost than a high-definition camera sensor device; compared with a pyroelectric infrared sensor, it has high measurement accuracy and a wide measurement range.

(3) The utility model adopts a classified warning system, and different situations control the warning system to generate different warning modes, so that the driver can judge the dangerous situation more accurately, so as to take corresponding measures in a targeted manner.

(4) The data of the main processor of the utility model is a digital signal converted by the A/D converter, and the anti-interference ability is greatly enhanced. Compared with the traditional hardware direct measurement method, the measurement accuracy is greatly improved.

Description of drawings

Fig. 1 is a working principle block diagram of the utility model.

Fig. 2 is the work flowchart of the utility model.

Figure 3 is a schematic diagram of the distribution of ultrasonic radar detectors on a car.

FIG. 4 is a schematic diagram of a method for solving obstacle coordinate points.

Figure 5 is a schematic diagram of the algorithm of the system during the driving of the car.

Fig. 6 is a schematic diagram of the algorithm of the system during the parking process of the car.

Figure 7 is the peripheral circuit diagram of the main controller.

Figure 8 is a peripheral circuit diagram of the ultrasonic information collection system.

FIG. 9 is a peripheral circuit diagram of the turn signal state detection device.

Fig. 10 is a peripheral circuit diagram of the parking detection system.

Figure 11 is a peripheral circuit diagram of the alarm system.

Figure 12 is a peripheral circuit diagram of the UPS power supply.

Detailed ways

As shown in Figures 1 and 2, an automobile safety early warning system includes an ultrasonic information collection system 1, an A/D converter 2, a turn signal status detection device 3, a parking detection system 4, a UPS power supply 5, and a main controller 6 and the alarm system 7, the UPS power supply 5 supplies power to the ultrasonic information collection system 1, the A/D converter 2, the turn signal state detection device 3, the parking detection system 4, the main controller 6 and the alarm system 7 respectively, The ultrasonic information collection system 1 is connected with the A/D converter 2, and the A/D converter 2, the turn signal state detection device 3, the parking detection system 4, and the alarm system 7 are all connected with the main controller 6 , the ultrasonic information collection system 1 monitors the relative motion trend and relative position of objects around the vehicle, and sends the collected information to the A/D converter 2, and the A/D converter 2 processes the information of the ultrasonic information collection system 1 Back to the main controller 6, the turn signal state detection device 3 is used to judge the driver's action intention during the running of the vehicle, the parking detection system 4 determines the state of the vehicle by detecting the state of the brake pedal and the handbrake, and the main controller 6 calculates The input information determines whether an alarm is required; the alarm system 7 takes corresponding alarm actions after receiving the alarm signal. The peripheral circuits and their specific connections are shown in Figures 7, 8, 9, 10, 11, and 12.

The ultrasonic information collection system 1 is composed of a plurality of ultrasonic radar sensors.

As shown in Figure 3, the ultrasonic information collection system 1 is composed of 14 ultrasonic radar sensors, wherein the front and rear bumpers of the automobile are each evenly arranged three on the same horizontal line, and the two sides of the automobile are each evenly arranged on the same horizontal line. Arrange four.

The turn signal state detection device 3 is a through-beam photoelectric switch installed on the turn signal toggle lever. When the turn signal toggle lever is turned, the up and down position of the operating lever is judged by the through-beam photoelectric switch, and it is judged that it is left or right. Turn or right turn light.

The parking detection system 4 includes a displacement sensor one 8 installed on the handbrake handle and a displacement sensor two 9 installed on the brake pedal. The displacement sensor judges the handbrake according to the increment or decrement of the displacement, and the output is high or low. Different levels are used to judge whether it is the brake state or the release state. The main controller judges whether the handbrake is enabled through the signal output by the first displacement sensor; the main controller judges whether the brake pedal is enabled through the signal output by the second displacement sensor. Combine the two to determine the parking state of the car.

Described UPS power supply 5 is vehicle-mounted UPS power supply.

The model of the main controller 6 is STM32F103V.

The alarm system 7 is composed of three mutually independent alarm modules, namely an indicator light alarm module 10 , a vibration alarm module 11 and a buzzer alarm module 12 .

The specific working steps are as follows:

Step 1, evenly distribute the ultrasonic radars on the front, rear, left and right sides of the car, where the front and rear bumpers of the car are evenly arranged three times on the same horizontal line, and the two sides of the car are on the same horizontal line Arrange four evenly.

Step 2, when the car engine is started, the vehicle warning system is turned on, the surrounding ultrasonic radars are activated, each ultrasonic radar collects distance data, and the main controller processes and judges whether there are obstacles within the set safe distance. If there is an obstacle, the warning system will send out an indicator light to warn; if there is no obstacle, there will be no corresponding action.

Step 3: The ultrasonic radar collects distance information in real time, and the main controller judges whether the relative movement trend of the object and the vehicle is dangerous or whether the driver has dangerous intentions (turning the turn signal in a dangerous direction) through a prefabricated algorithm. If there is, the warning system sends out a seat vibration warning; if not, there is no corresponding action.

Step 4. When the car is parked, the ultrasonic radar continues to scan and collect relevant distance information. If the main controller judges that the distance is less than the set threshold, it judges that the surrounding obstacles are threatening to the vehicle, and the alarm system sends out a buzzer alarm; if it is not less than If the threshold is set, there will be no corresponding action.

Step 5, when the car lock signal is received, the system stops working.

The principle of the ultrasonic radar in steps 2, 3, and 4 to collect distance information is to use the time difference ranging method. That is, the ultrasonic transmitter emits ultrasonic waves in a certain direction, and starts timing at the same time as the emission time. The ultrasonic waves propagate in the air, and when they encounter obstacles on the way, they return immediately, and the ultrasonic receiver stops timing immediately after receiving the reflected waves. The propagation velocity of ultrasonic waves in the air is 340m/s. According to the time t recorded by the timer, the distance (s) between the emission point and the obstacle can be calculated, namely: s=340t/2.

As shown in Figures 4, 5, and 6, the method for the main controller to establish a coordinate system in the calculation in steps 2, 3, and 4 is: take the right side of the car forward as the X axis, and take the left side of the car as the Y axis Establish a Cartesian coordinate system to obtain the coordinates of surrounding obstacles for easy calculation. The calculation method is as follows: r ₁ and r ₂ are two ultrasonic radars that detect the same obstacle, where r ₁ is the ultrasonic radar on the side close to the coordinate axis, and the angle α is ∠r ₁ of Δr ₁ r ₂ q. d is the distance from the obstacle to the nearest car body, p is the perimeter of Δr ₁ r ₂ q, w is the width of the car, l is the length of the car, x _r , y _r are the horizontal and vertical coordinates of the ultrasonic radar.

Using Heron's formula:

Solving for d.

Using the law of cosines: Solve for cosα.

When the obstacle q is on the left side of the car: y _q =w+d, x _q =x _r1 +|qr ₁ |cosα.

When the obstacle q is on the right side of the car: y _q = -d, x _q = x _r1 +|qr ₁ |cosα.

When the obstacle q is in front of the car: y _q =y _r1 +|qr ₁ |cosα, x _q =l+d.

When the obstacle q is behind the car: y _q =y _r1 +|qr ₁ |cosα, x _q =-d.

The algorithm for judging whether an alarm is required in step 3 is as follows: three consecutive scans at time t ₁ , t ₂ , t ₃ capture the three positions of the same obstacle point p as p ₁ , p ₂ , p ₃ , and obtain d ₁ , d ₂ and d ₃ , when d ₂ -d ₁ <0 and d ₃ -d ₂ <0 are satisfied at the same time, the main controller sends a signal to the alarm system, and the alarm system issues a vibration alarm.

The algorithm for judging whether an alarm is needed in step 4 is: continuously scan the position of the surrounding obstacles to obtain d, when d<m, the main controller sends a signal to the alarm system, and the alarm system sends out a buzzer alarm (m is the vehicle side to the farthest end of the door).

Claims (8)

1. a kind of automobile safety early-warning system, it is characterised in that：Include ultrasound information acquisition system, A/D converter, steering Lamp condition checkout gear, parking detecting system, ups power, master controller and warning system, the ups power are given super respectively Information of acoustic wave acquisition system, A/D converter, turn signal state detection device, parking detecting system, master controller and warning system Power supply, the ultrasound information acquisition system are connect with A/D converter, the A/D converter, turn signal state detection dress It sets, parking detecting system, warning system are connect with master controller, ultrasound information acquisition system monitoring vehicle periphery The relative motion trend and relative position of object, and the information of acquisition is sent to A/D converter, A/D converter is by ultrasonic wave Master controller is transmitted to after the information processing of information acquisition system, turn signal state detection device is for judging driver in vehicle row Intention is acted during sailing, parking detecting system determines vehicle condition, master control by detecting the state of brake pedal and parking brake The information that device processed calculates input judges whether to need to alert；Warning system receives alarm signal and makes corresponding actuation of an alarm.

2. a kind of automobile safety early-warning system according to claim 1, it is characterised in that：The ultrasound information acquisition System is made of multiple ultrasonic radar sensors.

3. a kind of automobile safety early-warning system according to claim 2, it is characterised in that：The ultrasound information acquisition System is made of 14 ultrasonic radar sensors, and wherein automobile front/rear collision bumper respectively equably arranges three in the same horizontal line A, two sides of automobile are each in the same horizontal line equably to arrange four.

4. a kind of automobile safety early-warning system according to claim 1, it is characterised in that：The turn signal state detection Device is on steering indicating light poke rod to penetrating optoelectronic switch.

5. a kind of automobile safety early-warning system according to claim 1, it is characterised in that：The parking detecting system packet Include the displacement sensor one on parking brake handle and the displacement sensor two mounted on brake pedal, wherein master controller The signal exported by displacement sensor one judges whether parking brake enables；The letter that master controller is exported by displacement sensor two Number judge whether brake pedal enables, the two is combined to the parked state for judging automobile.

6. a kind of automobile safety early-warning system according to claim 1, it is characterised in that：The ups power is vehicle-mounted Ups power.

7. a kind of automobile safety early-warning system according to claim 1, it is characterised in that：The model of the master controller For STM32F103V.

8. a kind of automobile safety early-warning system according to claim 1, it is characterised in that：The warning system is by three A mutually independent alarm module composition, refers respectively to show lamp alarm module, vibrations alarm module and buzzer alert module group At.