CN201534528U - Rear-end collision pre-warning device for automobile - Google Patents

Abstract

The utility model relates to a rear-end collision pre-warning device for an automobile, which comprises a controller, a throttle position sensor, a velometer, an ultrasonic transmitter and a brake tail lamp warning module which are connected with the controller, wherein the throttle position sensor is used for detecting the position of an accelerator pedal, and the velometer is used for detecting the speed of a back automobile; and the ultrasonic transmitter is used for transmitting ultrasonic waves to measure the distance between automobiles, and the controller controls the brake tail lamp warning module to give alarm signals according to the automobile speed and the distance between the automobiles. When a driver releases the accelerator pedal, the rear-end collision pre-warning device adopts a blink method of a brake tail lamp to remind of a driver of a back automobile, fully utilizes a short time from the accelerator pedal releasing to the brake pedal pressing, and allows the brake tail lamp to blink by determining the distance between the automobiles and the automobile speed, thereby effectively preventing rear-end collision accidents.

Description

A kind of rear-end collision prior-warning device

Technical field

The utility model relates to a kind of auto-safety mechanism, particularly a kind of rear-end collision prior-warning device.

Background technology

In recent years, China's economic obtains fast development, and the private car owning amount increases fast, and highway construction is also fast-developing, and meanwhile frequent accidents takes place, and wherein, rear-end impact ranks first in the accident, so the prevention traffic accident mainly is the collision of prevention rear-end collision.The basic reason that produces rear-end collision is the actual distance of braking stopping distance greater than forward and backward automobile, and the braking stopping distance has comprised the distance and the stopping distance of reaction.In the prior art, have only when chaufeur runs into situation and steps on brake pedal, the automobile brake taillight is just lighted and is sent the braking warning signal, but unclamp Das Gaspedal to the time delay of stepping on the nearly 0.3～0.7s of brake pedal at chaufeur, the automobile brake taillight is not lighted during this period of time, and in most of the cases chaufeur unclamps Das Gaspedal, and do not step on brake pedal, just prepare to step on brake pedal, at this moment, the automobile brake taillight is not lighted yet, so the action that the place ahead chaufeur will be taked, the chaufeur of front vehicle is not also known, have only etc. and to step on brake pedal to the place ahead chaufeur, be that the automobile brake taillight is lighted Shi Caineng and taken appropriate measures, the automobile driver of front vehicle often feels too unexpected like this, also causes the car accident that knocks into the back easily.

The utility model content

The utility model causes the problem of vehicle generation rear-end collision in order to solve in the technology too suddenly owing to stop, and a kind of rear-end collision prior-warning device that prevents vehicle rear-end collision is provided.

A kind of rear-end collision prior-warning device that the utility model provides comprises controller; With controller bonded assembly throttle position sensor, described throttle position sensor is used to detect the position of Das Gaspedal; With controller bonded assembly velometer, described velometer is used to detect the speed of back car; With controller bonded assembly ultrasonic transmitter, described ultrasonic transmitter is used for backward car emission super sonic with the distance between the measuring vehicle; With controller bonded assembly braking taillight alarm module, described controller sends alerting signal according to the speed of a motor vehicle and spacing control brake taillight alarm module.

The rear-end collision prior-warning device that the utility model provides is when the car chaufeur unclamps Das Gaspedal, employing makes the mode of braking taillight flicker remind back car chaufeur, made full use of chaufeur and unclamped Das Gaspedal to stepping on this of short duration time before the brake pedal, by judging that spacing, the speed of a motor vehicle make the flicker of braking taillight, reach the early warning effect, actv. has prevented the generation of rear-end collision.

Description of drawings

Fig. 1 is a kind of example structure figure of the utility model rear-end collision prior-warning device;

Diagram of circuit when Fig. 2 is the utility model rear-end collision prior-warning device ultrasonoscope;

Fig. 3 is change in location figure between vehicle in the utility model rear-end collision prior-warning device emission ultrasound process;

Fig. 4 is the utility model rear-end collision prior-warning device alarm control diagram of circuit.

The specific embodiment

As shown in Figure 1, a kind of rear-end collision prior-warning device comprises controller 1; With controller bonded assembly throttle position sensor 2, described throttle position sensor 2 is used to detect the position of Das Gaspedal; With controller 1 bonded assembly velometer, described velometer is used to detect the speed of back car; With controller 1 bonded assembly ultrasonic transmitter 7, described ultrasonic transmitter 7 is used for backward car emission super sonic with the distance between the measuring vehicle; With controller 1 bonded assembly braking taillight alarm module 8, described controller 1 sends alerting signal according to the speed of a motor vehicle and spacing control brake taillight alarm module 8.

Described throttle position sensor 2 is mounted in the sensor that being used on the throttle plate pin detected throttle opening, can adopt simulation throttle position sensor or switching regulator throttle position sensor, described throttle position sensor 2 is used to detect the position of Das Gaspedal, and the position signal of Das Gaspedal is transferred to controller.

Be provided with photoelectrical coupler 4 between described throttle position sensor 2 and the controller 1, described throttle position sensor signal may produce the incoming signal of controller 1 in the course of the work and disturb, can between the energizing signal of system and controller 1, optic coupler be set, with the interference of isolation signals, thereby guaranteed the reliable operation of controller 1 to controller 1.

Described controller 1 can be selected micro controller system such as 80C51 series etc. for use.

Described velometer can be infrared velometer, and described infrared ray velometer 6 is used to detect the speed of back car, and described infrared ray velometer is launched infrared light-wave and decided speed by measuring the infrared light-wave delivery time.Because the light velocity fixes, laser pulse is sent to the time that target turns back again and can be directly proportional with distance, with two pulses of fixed interval emission, can record two distances; The difference of this this two distances can be obtained the speed of target divided by Transmission Time Interval.Described infrared ray velometer can adopt velometer common on the market, as smooth VC6234P of Thailand etc.Described velometer can also be radar speedometer, and principle is similar to infrared velometer, no longer is described in detail here.

Described ultrasonic transmitter 7 is used for backward car emission super sonic with the distance between the measuring vehicle, described ultrasonic transmitter is car emission super sonic backward, in x time, pick up counting, run into obstacle during super sonic is propagated on the way and just return immediately in air, ultrasonic transmitter receives that backward wave just stops timing immediately.The aerial propagation speed of super sonic is 340m/s, according to the time t of timer record, just can calculate launch point apart from obstacle apart from s, that is: s=340t/2.Ultrasonic transmitter can be divided into two big classes: a class is to produce super sonic with electric means, and a class is to produce super sonic with mechanical system.Electric means comprises piezo-electric type, magnetostriction type and power type etc.; Mechanical system has jar (unit of capacitance) system flute, the liquid whistle and air-flow siren etc.The frequency of ultrasonic that they produced, power and acoustic wave character have nothing in common with each other, thereby purposes also has nothing in common with each other.Comparatively commonly used is the piezoelectric-type ultrasonic wave producer at present.Described ultrasonic transmitter can be installed in below the car rear taillight.

Diagram of circuit when being illustrated in figure 2 as rear-end collision prior-warning device ultrasonoscope, the speed of car is v1 after measuring by the infrared ray knotmeter earlier, and the speed of a motor vehicle that detects when car unclamps throttle is v2, and deceleration acceleration/accel absolute value is a.Then by ultrasonic transmitter car emission super sonic backward, the timing of counting machine is set at 1ms, calculate according to the timing of counting machine and send super sonic to receiving the used time t of super sonic that reflects from car.

From sending super sonic from car, as seen shown in Figure 3 from the change in location situation of car and back car to receiving the ultrasound process that reflects.Wherein, d is current distance from car and back car, and supposes that hypracoustic speed is v3, following as can be drawn from Figure 3 relational expression:

$x1=v2*t-\frac{1}{2}{\mathrm{at}}^2---\left(1\right)$

x2＝v1*t (2)

Can get from formula (1) and formula (2):

$x3=v3*t-x1-x2$

$=\frac{v3*t-(v2*t-\frac{1}{2}{\mathrm{at}}^2)-v1*t}{2}---\left(3\right)$

Can draw current distance from formula (1) and formula (3) from car and back car:

$d=x1+x3$

$=v2*t-\frac{1}{2}{\mathrm{at}}^2+\frac{v3*t-(v2*t-\frac{1}{2}{\mathrm{at}}^2)-v1*t}{2}$

$=\frac{1}{2}((v2+v3-v1)*t-\frac{1}{2}{\mathrm{at}}^2)$

Described rear-end collision prior-warning device also comprises brake switch sensor 3, and described brake switch sensor 3 is connected the position that is used to detect brake pedal with controller 1.

Be provided with photoelectrical coupler 5 between described brake switch sensor 2 and the controller 1.The brake switch sensor in the course of the work may be to the interference of controller input signal, can between the energizing signal of system and controller optic coupler be set, and with the interference of isolation signals to controller, thereby has guaranteed the reliable operation of controller.

Described rear-end collision prior-warning device also comprises audio alert module 9, and described audio alert module 9 is connected with controller and is used for audio alert, and described audio alert module 9 can adopt buzzer phone.

Described rear-end collision prior-warning device also comprises braking taillight alarm module 8, described braking taillight alarm module 8 comprises a plurality of LED matrix lamp, the flicker of braking taillight and light and adopt the brake switch and the throttle sensor signal of former car to drive, can realize like this braking taillight light and flicker and brake pedal and Das Gaspedal synchronously, and the signal that can gather brake switch and throttle sensor in time is used to drive the flicker of braking taillight, guarantees that braking taillight energizing signal is reliable and stable.

Following basis specifically describes the concrete alarm control process of present embodiment in detail:

As shown in Figure 4, judge at first whether the brake switch sensor sends speed-slackening signal, and when controller detects chaufeur and steps on brake pedal (by detecting the signal changing value of brake switch sensor), controller just sends the normal brake application signal, the braking taillight is lighted entirely, finish the function of traditional braking taillight, if judge without speed-slackening signal whether throttle position sensor has the accelerator pedal signal of unclamping, if do not unclamp and just extinguish the braking taillight, if unclamped Das Gaspedal then the signal changing value of controller detection throttle sensor, controller is at first measured the back car speed of a motor vehicle by the infrared ray knotmeter, measure from the distance of car by ultrasonic transmitter then with the back car, if this moment distance safety distance with the interior and back car speed of a motor vehicle greater than from the car speed of a motor vehicle time, controller just sends the early warning actuation signal, make the flicker of braking taillight, simultaneously to send from the car chaufeur deceleration distance less than safety distance audio alert remind, it is fixed that safety distance comes according to the back car speed of a motor vehicle, as the back car speed of a motor vehicle is 100km/h, then safety distance is 100m, 80km/h then is 80m, then is 10m less than 10km/h.The design has made full use of chaufeur and has unclamped throttle to stepping on this of short duration time before the brake pedal, makes the flicker of braking taillight by judging spacing, the speed of a motor vehicle, and sends audio alert and remind, and reaches the early warning effect.Just judge again current from car with the back spacing whether less than safety distance, if not just extinguishing the braking taillight, if just judge again that the back speed of a motor vehicle is whether greater than from the speed of a motor vehicle, if not just extinguishing the braking taillight, if just make the flicker of braking taillight, send audio alert simultaneously.

In the alarm control process, the every 10ms run-down of program when scanning the condition of sending warning when meeting, is then sent warning at once.

The specific embodiment of the above is a better embodiment of the present utility model; be not to limit concrete practical range of the present utility model with this, the equivalence variation that all shapes according to the utility model, structure are done all is included in the protection domain of the present utility model.

Claims (7)

1. a rear-end collision prior-warning device is characterized in that: comprise controller; With controller bonded assembly throttle position sensor, described throttle position sensor is used to detect the position of Das Gaspedal; With controller bonded assembly velometer, described velometer is used to detect the speed of back car; With controller bonded assembly ultrasonic transmitter, described ultrasonic transmitter is used for backward car emission super sonic with the distance between the measuring vehicle; With controller bonded assembly braking taillight alarm module, described controller sends alerting signal according to position, the speed of a motor vehicle and the spacing control brake taillight alarm module of Das Gaspedal.

2. rear-end collision prior-warning device according to claim 1 is characterized in that: described velometer is infrared ray velometer or radar speedometer.

3. rear-end collision prior-warning device according to claim 1 is characterized in that: also comprise the brake switch sensor, described brake switch sensor is connected the position that is used to detect brake pedal with controller.

4. rear-end collision prior-warning device according to claim 1 is characterized in that: also comprise the audio alert module, described audio alert module is connected with controller and is used for audio alert.

5. rear-end collision prior-warning device according to claim 1 is characterized in that: be provided with photoelectrical coupler between described throttle position sensor and the controller.

6. rear-end collision prior-warning device according to claim 1 is characterized in that: be provided with photoelectrical coupler between described throttle gate and the controller.

7. rear-end collision prior-warning device according to claim 1 is characterized in that: described braking taillight alarm module is a plurality of LED matrix lamp.

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