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1、 河北工程大学毕业设计 automotive safety systems and technology research and analysisabstract: auto parts of good and bad will directly affect the safety of the car, are directly related to the people's life safety and security in wealth. this article mainly from the car's active safety technology and

2、passive safety technology two aspects elaborated the importance of car parts, and how to improve the safety of the car. key words: automobile, active safety technology, passive safety technology as traffic tools of the modernization and absolute number increase sharply, traffic accidents are also in

3、creasing. car accident has become severe global social issues. undoubtedly, advanced auto safety facilities are the driving safety indispensable safeguard. so, we should start, from technology to research and development of high performance, high safety car, also want to strengthen the regular inspe

4、ction in cars, so timely maintenance investigation, make cars often in good technical status, so as to improve the safety performance of the car. here we introduced active safety technology and automobile car passive safety technology. auto safety is according to the traffic accident happened before

5、 and after the classified. one is in a traffic accident take safety measures, especially before immediately will produce risk condition, drivers manipulate the steering wheel avoid or emergency brake to avoid traffic accidents. in the car, drive in usually to ensure the basic manipulation stability,

6、 drivers on the surrounding environment and to ensure the visual recognition sex drive the car itself, developed the basic performance ant-lock braking system (abs), prevent slippery drive system (asr), active suspension, power steering and four-wheel drive (4wd), four-wheel steering (4ws), lighting

7、 system, wiper, the rearview mirror, prevent from rear-end collision car alarm system and laser radar, etc. these security devices and technology, called active safety system, can also be called preventive security system. on the other hand, in order to reduce traffic accidents and company by person

8、nel directly suffer degree, ensure company take staff and pedestrian safety, says the security for passive safety, can also be called conflict safety. when after the accident, in order to prevent disasters, including prevent the expansion of fire and make crew from traffic accident can extricate the

9、 security devices and systems, called prevent disaster expand security system. oneautomobile active security technology 1. abs braking system ant-lock braking system (braking system, lock do by abs computers as abs), hydraulic device, the wheel speed sensors, brake hydraulic pipeline and electrical

10、wiring etc. their structures are shown below. abs tasseled for the car in various driving conditions braking performance and brake safety particularly important, especially is emergency braking, can make full use of the peak between tire and road surface adhesion properties, improve performance and

11、reduce automobile fight sideslip braking distance, give full play to the braking performance, but also increase the automobile braking process control. so as to reduce the possibility of car accidents. no installation abs car, if the driving force trample brake pedal, wheel will rapidly lower speed,

12、 and finally wheels stop turning, but body because of inertia remains forward sliding. this phenomenon was at the wheel and pavement occur between larger "slip", appear this kind of situation, the car tires of automobile lateral spreads almost disappear, so poor force will appear the follo

13、wing phenomena: (1) steering stability fall: the steering wheel is ineffective, vehicle tail manipulation of curl, serious when vehicle circles or appear folding phenomenon; (2) handling fall: manipulate the steering wheel and short of steering requirements; (3) braking distance extended: more than

14、general braking distance. so, we can imagine to have installed abs system of the car safety is very important. 2the asr drive torque control system abs are used to prevent car braking process wheel lock, will wheel sliding rate control in ideal range, so as to shorten the braking distance, improve a

15、utomobile braking direction stability and steering control, so as to improve the safety of the car. along with the increase of vehicle performance requirements, not only in braking process required to prevent wheel lock, and asked the driver to prevent drive roller skating turn in the process, makin

16、g cars in the direction stability, driving process steering control ability and acceleration performance, so are improved by the car drive torque steering system asr (accelerations regulation) slip. asr is the perfect complement and abs asr, but most alone is set with abs combined together, commonly

17、 used abs/asr says, called antiskid control system. asr is mainly used to prevent car in the beginning, accelerate the wheels, guarantee slip in the car accelerated rate and improve the stability in bad pavement drive attached conditions. it makes no difference speed in the car lock ice roads and mu

18、ddy road started and to improve its capacity, also can prevent high in speed by turning cars gliding pavement and rear lateral spreads phenomenon. anyhow, prevent the wheel because asr slip, can maximize the engine driving moment of cars had enough, ensure the longitudinal force, lateral force and m

19、anipulation of power, make cars in starting, steering and accelerate the process, in gliding and muddy road, in a mountain area downhill process can steadily driving, guarantees the safety, reducing tire wear and fuel consumption, and improves the car driving capability. 3vdc system abs/asr system s

20、uccessfully solves the brake and the car when driven direction stability problem, but cannot solve the vehicle steering stability problem driving direction. for example when steering road, inevitably by lateral and longitudinal force, only local surface can provide full lateral and longitudinal forc

21、e, the pilot can control vehicles. if the ground adhesion ability lower lateral, will damage cars driving ability predetermined direction. rainy days cars driving, often high-speed steering lateral sliding out, it is the ground because of insufficient lateral adhesion ability. to resolve the issue,

22、and developed countries automobile industry recently in abs/asr system on the basis of the development of dynamic control system (into car dynamics control, the abbreviation vdc vehicle). the system of the car brake, driving, suspension, steering, engine and so on various main assembly control syste

23、m in function, structure organic ground comprehensive together, can make cars in all kinds of bad working conditions, such as ice road pavement, commuting, river bend pavement and took evasive action moving line, braking and acceleration and the downhill for different conditions, such as bearing, di

24、fferent type pressure and different levels of type wear all have good direction stability, to show the best driving performance. vdc applications, in braking, acceleration and steering aspects of driver's fully released request, is the car of active safety driving a new milestone. vdc of steerin

25、g control system is mainly by driving for each wheel brake control and engine power output control to realize. for example, if the car turn left front wheel for steering the inadequate capacity tend to slip out of the corner, vdc system can measure imminent, just know lateral spreads left rear brake

26、 adopt appropriate measures. if at the same corner, because rear wheel tend to slip out of favor of lateral overmuch, vdc system is proper braking to front-right wheel failure, maintain the stability of the vehicle driving. in extreme cases, vdc system can also take reduce engine to reduce the power

27、 output, and to reduce the speed of the demand side adhesion ability to maintain the stability of the vehicle driving. adopt vdc system, automobile in folio pavement or corner of pavement braking distance still can further reduce. 4 ccs cars cruise control system auto cruise control system (cruiser

28、control system, abbreviation for ccs) is can make automobile work in engine favorable speed range, reduce driver's driving manipulate labor intensity, improve the driving comfort the automatic driving device. car cruising system (ccs) role is required by the driver: after a normally-closed switc

29、h, no speed on the accelerator pedal can automatically keep the speed, make the vehicle with the fixed speed. using this device, when on the highway after a long time, the driver driving not have to control the accelerator pedal, reduce fatigue, while reducing unnecessary speed change, can reduce sa

30、ve fuel. auto cruise control system is the earliest development of the automotive electronic control system. this system uses another speed sensor, will speed signal input engine control microcomputer, by microcomputer control vacuum system work. this system can make use of the server, speed control

31、 switch lever and brake pedal on vacuum lift switches etc, its function and basic system the same. in this system, electronic control device can accord change of driving resistance, automatic regulation engine throttle angle, make the speed constant. such not only reduce unnecessary speed change, wh

32、ich saves fuel, also reduced the driver's burden. the electronic cruise control system which is shown in figure 2. two. automobile passive safety technology 1. seat belt car seat belt is a safety device, it can in car collision or sharp turn, make crew to keep its original position as possible w

33、ithout mobile and rotation, avoid collision with in-car hard parts caused damage. seat belts and airbags, as modern cars are safety devices, but the long history of the former, popularize the scope. the seemingly simple seat belt actually not "simple". attention has been at the forefront o

34、f traffic safety, through the analysis of general motors after a car accident found: seat belt not only makes people protect the lives, can be in more than half of the accident to reduce or even eliminate drivers, motorists are the chance of injury. car collision or unexpected emergency braking forc

35、e generated great inertia, will allow the driver and passenger and car windscreen, steering wheel, seat, collision happened objects such as secondary to drive is caused extremely easily crew serious damage, even drive occupant seats or threw the apex, seat belts can will ride in the seat. bondage pe

36、rsonnel when has the accident, which can effectively prevent the collision, and its buffer role can absorbs a great deal of kinetic energy, reduce rides personnel extent of the injuries. fasten your seat belt airbags play our role is also an important condition. because the airbag to maximize role f

37、or the ride in the impact of the physical location, sitting instant action have extremely strict and the requirements. otherwise, the airbag started strong instantaneous wallops to head are fragile site, may cause serious damage, especially for children, this damage can be fatal. even the most ordin

38、ary three belts, try a can timely in crash that lived rides the bundle, ensure the upper part of a ride in the airbag fully extended range, make the airbag most effectively play efficacy. accordingly, must not because the car is equipped with airbags and feel carefree seat belt fastened, only to red

39、uce or eliminate the traffic accident happen. 2. the airbag when the front collision happened strong, because inertia, who rides the body forward fast moving, then seat belts and will try to "pull" rides on person the body, absorb some of the impact energy, while the airbag with "the

40、eyepiece trend" inflatable and completely open; then the rides the upper body will sink to airbags, gas also began from the vent air uniform escaping, and absorbed most of the impact energy; subsequently, the ride back seat and return to the body. above the whole process is almost always happen

41、s in a flash, who rides the completely in passive situation, in this case, the passive rely on auxiliary occupant protection system is the only option. airbags development design is based on the protection on seat belt co., ltd; they cooperate with each other to ride the play the auxiliary protectiv

42、e effect. seat belt usage in under the condition of the crew, balloon help reduce chest, head and facial injuries in the seriousness of the collision. when car collision happened before, the first is the car to stop motion, car under the action of inertial force crews to go forward with the original

43、 speed still sport. not wearing a seatbelt crews will and steering dish, front windscreen together, so it can be severely hurt; wearing a seatbelt as car stop the crew can stop moving forward movement and gradually. if collision violent, crew forward movement of the seat belts, even faster in the co

44、mplete stop before motion, still and in-car things together. if this fashion in steering the disk or within the popup balloon inflated dash, it can protect the occupant reduce the possibility of car together with things, more uniform dispersion head, chest, absorb the impact energy of movement, thus

45、 crew has added effect of seat belts. in addition to seat belts and airbags outside car passive safety technology includes car bumper, automobile safety glass, security body, occupant head and neck protection system (whips), etc. these vehicles to improve the safety performance has very important co

46、ntribution three. automobile active safety new technology 1. eye car skills eye car technology can make each driver eyes in the same relative height, guarantee of pavement and the surrounding a six-lane unimpeded sight and best visibility. this technology can also offer a specific driving environmen

47、t. eye car through the use of first-class motor mobile automatic will different figure driver's eyes tuned to the same height to solve the problem, meanwhile, visibility of steering dish, brake and accelerate pedals and floor and the central adjustment to constitute console to their respective d

48、riving conditions. meanwhile to the former pillar design, will it again from drivers sights removed. because the bus driver received the most crucial information generally have 90% from outside, acquired through the eyes observe. so, this improvement for vehicle safety is of great significance. 2. c

49、am car technology cam car technology aims to help improve the driver of perception. the technical features are: (1) installed in the car to camera system on both sides before to make drivers can bypass the large vehicle behind a car or see ahead of pedestrians. in a typical driving situation in the

50、crowded traffic, the pilot of the centre-left cornering could more easily view the opposite of vehicles. (2) side after buy video camera provides broader visual profile of vision. the camera coverage than traditional rearview mirror wants wide, especially for the adjacent driveway. (3) installed in

51、a car, the four miniatures sectored form to decorate after a camera can obtain the car panoramic perspective. image via electronic synthesis, has the zoom and 160 ° wide-angle ability. (4) "night eye" (night eye) camera can be in low illumination conditions, when the car is in reverse

52、 gear, even in a dark cases can also provide car close range after small images. four. automobile passive safety new technology 1. future airbags (1) it cans inflatable screen system. this is a new safety design; its basic principle is to protect in-car occupant's head, when that happens it will

53、 carry on the air, air after the tent shape is swelling. (2) tubular inflatable structure head air sac. this system for supplement current side protection system, still stopover in protecting the chest and abdomen, brachial ministry, to head protection were insufficient. it with rigid body structure

54、, the door body protective just beams, side air sac, can form a complete side safe defend net, this will be the future security protection trend. (3) head support system. head support system generally called the headrest, vehicles which the headrest, with seats, not just for comfortable fact is more

55、 important to safety. vehicle if in an emergency brake, the body will have strong to and fro, because the principle of inertia occupant body swinging, especially neck must follow. if no head support buffer headrest, neck injury caused by damage is very surprising. (4) the external airbags. 2. adapti

56、ve constraint technology system (arts) new adaptive constraint technology system (arts) use a series of sensors to monitor the driver seat, seat belt use, in front of the occupant take quality and location and intensity of the collision of the collisions and collision force direction, then according

57、 to the specific information such as the collision of each front airbag characteristics of the crew on regulated. the system can further reduce due to improper airbag for crew on the damage, especially for smaller front row figure crew. 3. automobile energy-absorbing direction column auto absorbing

58、in automobile direction tubing through collisions of redistribution to steering wheel wallop, would wallop path to deliver shunt quickly, making the minimum of load on the steering wheel. the steering column by hollow tubes and steering bearings form. traditional hollow tubes and the steering column

59、 steering bearings is integral, steering shaft top and steering connections, the connecting with direction below. and suck can direction string of characteristic is will the steering column in two, divided into unblock steering column and the steering column under two parts; inside of the steering shaft also divided into two sections, with outgoing quarter agencies between them connected. once a collision make direction, outgoing quarter mechanism has displacement bottom