CN1321023C

CN1321023C - Automobile intelligent anticollision system

Info

Publication number: CN1321023C
Application number: CNB2004100279641A
Authority: CN
Inventors: 吴福培; 李昇平
Original assignee: Shantou University
Current assignee: Shantou University
Priority date: 2004-07-08
Filing date: 2004-07-08
Publication date: 2007-06-13
Anticipated expiration: 2024-07-08
Also published as: CN1676375A

Abstract

The present invention discloses an intelligent anti-collision system for an automobile, which is composed of a distance measuring device, a single chip computer, a sub alarming system and an automatic brake device. The system can be used for automatically inferring whether the running is safe or not according to the distance and the corresponding speed which are measured in a real-time way, and automatically braking under the condition that the brake is rapidly carried out to ensure the safety when the danger accidentally happens. The intelligent anti-collision system is an all-weather traffic intelligent anti-collision system which is suitable for ordinary road conditions. The present invention has the advantages of simple technical facilities, high reliability, low manufacturing cost and easy popularization.

Description

A kind of automobile intelligent collision avoidance system

Affiliated technical field

The present invention relates to a kind of automobile intelligent collision avoidance system, belong to the vehicle safety travel field, particularly relate to and avoid a kind of intelligent anti-collision system of bumping against with the place ahead locomotive or obstacle in the vehicle traveling process automatically.

Background technology

The safety traffic of automobile is the popular problem of being concerned about day by day, in case have an accident, the loss that its consequence caused is difficult to the appraisal.Yet in China and even the whole world because of driver inattention, fatigue, driving a car under the influence of alcohol or the driver too late at urgent moment reaction, fail to take the car collision that situation caused, car such as emergency brake measure but to happen occasionally with the incident of obstacle collisions.According to official statistics, from so far after World War II, the personal casualty that causes because of traffic accident is no less than the summation of 20th century Two World Wars casualty.Given this, at present existing much about guaranteeing the technology of vehicle safety travel, but can apply few, mainly be that these technology also exist many problems to be separated.It as application number 00101549.4 Chinese patent, introduce a kind of " anti-collision alarm for cars on the express highway ", what this device surface was right is the vehicle that travels in express highway, and can only show the distance of front vehicles and provide possible warning for the driver, but can't tackle under the emergency case, the car car that the driver has little time to operate bumps against.Application number is 02100762.4 Chinese patent, introduce a kind of " intelligent digital scale system for preventing collision of cars on expressway ", this system mainly solves is that express highway or similar applications are avoided in hot pursuit a kind of crashproof of automobile, it requires to establish at a certain distance wireless receiving and dispatching digital scale device on the road of travelling, each digital scale is established unique address code, in order to determine the position of automobile; Adorn infrared or the tellurometer survey sensor and on vertical ground-surface direction, whenever be spaced a distance, judge corresponding track, carry out digital communication and signal conditioning, its application requirements is transformed on a large scale to existing highway, and this has determined this system to be difficult to apply.Application number is 02276471.2 Chinese patent in addition, introduce a kind of " infrared laser full automatic car anticollision device ", the Applicable scope of this device is wide slightly, but when judging whether the possibility that bumps against with the place ahead locomotive or obstacle, what it was considered is the safety distance of evaluating driving with the speed of a motor vehicle of vehicle, do not consider that its relative velocity when two cars travel in opposite directions is greater than the speed of a motor vehicle of self, this moment corresponding safe driving, braking distance safe driving, braking distance more definite than only considering self speed of a motor vehicle is much bigger.Certainly; also have and adopt air bag protection, fence operation pipe unit to wait to guarantee traffic safety, but these devices all are to have collision just to work after taking place, and belong to control afterwards; only slowing down the damage that collision is caused, and can't avoid contingent collision in advance.So existing automobile automatic collision device is also undesirable apart from practical application effect, also needs to improve.

Summary of the invention

The problem that the present invention exists at prior art just and a kind of automobile intelligent collision avoidance system of proposing.This system can infer the safety of whether driving a vehicle voluntarily according to distance that records in real time and relative velocity, and need brake rapidly under dangerous emergency case and can brake automatically when ensuring safety.

Technical scheme

A kind of automobile intelligent control system, by distance measuring equipment (DME), micro controller system, the warning subsystem, dead-man's device is formed, distance measuring equipment (DME) is by signal generator IC1 pupil's signal, encoded device IC2, power amplifier IC3, infrared-emitting diode D1 emission detection signal, by infrared receiving diode D2, IC4, resistance, the signal receiving amplifier M that electric capacity is formed receives the detectable signal of reflected back, decode through demoder IC5, detect by detector IC6, and real-time detected signal is transferred among the micro controller system 89C51, micro controller system 89C51 extrapolates the relative distance s of Ben Che and the place ahead locomotive or obstacle by the program that configures _{I is relative}With relative velocity u _{I is relative}, with s _{I is relative}The s that calculates with the safe driving function s=f (u) that is built in micro controller system 89C51 in advance _Safety=f (u _{I is relative}) compare, according to the logic of program setting, micro controller system 89C51 infers the security situation of driving, output one road signal of micro controller system 89C51 is connected with photoelectric alarm circuit IC10, drives light crossing-signal F, acoustic alarm device G and reports to the police; Micro controller system 89C51 exports another road signal and is connected with brake IC circuit 11, control brake gear D brake.

In the circuit of the present invention, distance measuring equipment (DME) emission laser pulse signal, relative distance and relative velocity that micro controller system is measured driving and the place ahead locomotive or obstacle in real time according to the emission and the time of reception order of laser pulse signal, and the relative distance of gained and the desired safety distance of safe driving compared judge whether driving is in the safety traffic state, when safety distance during less than safe space between motorcars, micro controller system sends instruction and gives warning subsystem prompting driver, or be in when being in extreme danger state, micro controller system is directly passed to dead-man's device with instruction, carries out self-actuating brake by dead-man's device.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is running car range finding scheme drawing of the present invention;

Fig. 2 is circuit output control chart of the present invention;

Fig. 3 is schematic circuit diagram of the present invention.

Among the figure: 1, distance measuring equipment (DME), 2,4 infrared laser projectors, 3, the infrared laser receptor, 5, micro controller system, 6, dead-man's device, 7, annunciator, 8,10 light flash, and 9, alarm sound.

The specific embodiment

Automobile all has a cooresponding safety shut-down apart from s when travelling under arbitrary speed u (u is that automobile is with respect to ground-surface speed), s=f (u) is promptly arranged.This data relationship is provided by car production enterprise.The distance of supposing automobile and the place ahead locomotive or obstacle is s _Relatively, relative velocity is u _RelativelyShown in figure one.If two cars travel in the same way, u is arranged generally _Relatively≤ u, then f (u _Relatively)≤f (u); If two cars travel in opposite directions, u is arranged _Relatively〉=u then has f (u _Relatively) 〉=f (u) therefore selects relative velocity u for use _RelativelyDetermine safety shut-down apart from determining safety shut-down apart from rationally, also insuring manyly than the speed of a motor vehicle u that selects automobile itself for use.If automobile is with u _RelativelySafety shut-down distance when travelling is s _Safety, i.e. s _Safety=f (u _Relatively) (being equivalent to suppose that preface locomotive or obstacle are static this moment), for guaranteeing the safety of automobile, should satisfy:

If 1:s _Relatively〉=s _SafetyCruising;

If 2:s _Relatively≤ s _SafetyEmergency brake otherwise danger.

But in order to reduce the discomfort that emergency brake brings to the occupant, suggestion provides two kinds of selections in the brake stage: manually brake and autobrake.

Work as s _Safety＜s _Relatively≤ λ s _Safety, λ＞1, alarm the driver manually brake; Work as s _Relatively≤ s _Safety, artificial brake has little time, and carry out emergency brake by automatic brake arrangement this moment.

Therefore this automobile intelligent collision avoidance system is handled following three kinds of situations:

For: μ _Relatively, s _Relatively,

If 1:s _Relatively〉=λ s _SafetyCruising;

If 2:s _Safety＜s _Relatively≤ λ s _Safety, report to the police in λ＞1, artificial braking;

If 3:s _Relatively≤ s _SafetyThe automatic brake arrangement emergency brake.

Below in conjunction with accompanying drawing enforcement of the present invention is described in detail.

Three kinds of situations that Fig. 1 runs into for driving: two cars travel in opposite directions, two cars travel in the same way, drive a vehicle, and there is obstacle in the place ahead.As shown in Figure 2, distance measuring equipment (DME) 1 is by

infrared laser projector

2,4, infrared laser receptor 3 compositions such as grade.

Infrared laser projector

2,4 is periodically to vehicle front transmitter pulse signal, and this signal runs into obstacle and reflects immediately, is received by infrared laser receptor 3.The emission cycle of supposing the infrared laser signal is T, and propagation speed is u _Letter Micro controller system 5 according to i periodic signal from the time that is transmitted into recovery and experiences be t _IsCalculate the relative distance of De Benche and the place ahead locomotive or obstacle: s _{I is relative}=u _LetterT _Is/ 2, again according to adjacent twice distance that records: s _{I-1 is relative}, s _{I is relative}The relative velocity of calculating De Benche and the place ahead locomotive or obstacle is: u _{I is relative}=(s _{I-1 is relative}=s _{I is relative})/T, wherein i is a natural number.With the s that records in real time _RelativelyThe s that calculates with the safe driving function s=f (u) that is built in micro controller system 5 in advance _Safety=f (u _{I is relative}) compare, according to the logic of program setting, micro controller system 5 is inferred the security situation of driving voluntarily.If s _Relatively〉=λ s _Safety, illustrate that automobile is in the safety traffic state; If s _Safety＜s _Relatively≤ λ s _Safety, λ＞1 illustrates that automobile is in dangerous motoring condition, and this moment, micro controller system 5 sent alarm command, and annunciator 7 just sends alerting signal: light flashes 8,10 and alarm sound 9, and the prompting driver avoids safety misadventure; If s _Relatively≤ s _Safety, point out the driver artificially to brake and have little time this moment, and micro controller system 5 can pass to instruction dead-man's device 6 immediately, carries out self-actuating brake, avoids taking place car accident.Wherein dead-man's device 6 is by shared original brake system of car of the automatic brake arrangement of bringing out property of interpolation.

Fig. 3 is circuit embodiments figure of the present invention.As shown in Figure 3, by signal generator IC1 pupil's signal, encoded device IC2, power amplifier IC3, infrared-emitting diode D1 emission detection signal.The signal receiving amplifier M that is made up of infrared receiving diode D2, IC4, resistance, electric capacity receives the detectable signal of reflected back, decode through demoder IC5, detect by detector IC6, and real-time detected signal is transferred among the micro controller system 89C51, micro controller system 89C51 extrapolates the relative distance s of Ben Che and the place ahead locomotive or obstacle by the program that configures _{I is relative}With relative velocity u _{I is relative}, with s _{I is relative}The s that calculates with the safe driving function s=f (u) that is built in micro controller system 89C51 in advance _Safety=f (u _{I is relative}) compare, according to the logic of program setting, micro controller system 89C51 infers the security situation of driving.If infer that automobile is in dangerous motoring condition, then micro controller system 89C51 issues photoelectric alarm circuit IC10 with alerting signal, and light crossing-signal F, acoustic alarm device G report to the police; Be in extremely dangerous motoring condition if infer automobile, then micro controller system 89C51 passes to brake IC circuit 11 with the emergency brake signal, control brake gear D brake.Constant voltage power suspply IC7, reset circuit IC8, clock circuit IC9 and micro controller system 89C51 join.

The present invention can infer the safety of whether driving a vehicle voluntarily according to distance that records in real time and relative velocity, and under dangerous emergency case, need brake rapidly and can brake automatically when ensuring safety, it is a kind of round-the-clock, traffic intelligent collision avoidance system of being applicable to general road conditions, used technological facilities is simple, the reliability height, and cost is low, easily promotes.

Claims

1, a kind of automobile intelligent control system, by distance measuring equipment (DME), micro controller system, the warning subsystem, dead-man's device is formed, it is characterized in that: the signal that this system is produced by signal generator IC1, encoded device IC2, power amplifier IC3, infrared-emitting diode D1 emission detection signal, by infrared receiving diode D2, IC4, resistance, the signal receiving amplifier M that electric capacity is formed receives the detectable signal of reflected back, decode through demoder IC5, detect by detector IC6, and real-time detected signal is transferred among the micro controller system 89C51, micro controller system 89C51 extrapolates the relative distance s of Ben Che and the place ahead locomotive or obstacle by the program that configures _{I is relative}With relative velocity u _{I is relative}, with s _{I is relative}The s that calculates with the safe driving function s=f (u) that is built in micro controller system 89C51 in advance _Safety=f (u _{I is relative}) compare, according to the logic of program setting, micro controller system 89C51 infers the security situation of driving, output one road signal of micro controller system 89C51 is connected with photoelectric alarm circuit IC10, drives light crossing-signal F, acoustic alarm device G and reports to the police; Micro controller system 89C51 exports another road signal and is connected with brake IC circuit 11, control brake gear D brake.