CN2223706Y

CN2223706Y - Safety air bag device for preventing automobiles from collision

Info

Publication number: CN2223706Y
Application number: CN 94245201
Authority: CN
Inventors: 钟延沁; 戴实之
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-11-07
Filing date: 1994-11-07
Publication date: 1996-04-03
Anticipated expiration: 2004-11-07

Abstract

The utility model relates to a safety air bag device for preventing automobiles from a collision, which is composed of an electric sensor, a nitrogenous generator, and an air bag. The utility model is characterized in that the electric sensor uses a detector which is composed of a force sensitive element. When an automobile generates a collision, the detector can send out collision signals instantly to release the protection switch K1 of an electronic ignition circuit through an object recognition, signals processing, and a protection circuit to turn off the short circuit earthing switch of an electric ignition head H and to be connected into the electronic ignition circuit in series. When the collision acceleration sensed by the detector is reached (damaged) a certain value, ignition triggering signals are outputted to make an ignition switch K2 close, a storage capacitance C discharges electricity for the electric ignition head H to ignite nitrogenous generating agentia to generate plenty of air to fill the air into a collision preventing air bag. The utility model has the advantages of simple structure, sensitive response, and safe performance.

Description

The automobile collision preventing air bag device

The utility model belongs to automobile safety protector, is specifically related to a kind of automobile collision preventing air bag device.When the damage property taking place seriously collide with target, air bag is just in the moment inflation and eject, and forms a soft air cushion in navigating mate and passenger front and shields.

World today's motor vehicle on urban road is seething, and safety traffic is one of important difficult problem of needing to be resolved hurrily of the world.The people who dies from the traffic car accedent every year is ten hundreds of, and the wounded is countless especially.Adopting the air bag for protection driver and passenger is better means of present safety guard-safeguard, is subjected to the attention of auto-industry developed country.States such as many countries such as moral, U.S., day are early all at research and production safety air bag.External safe automobile air bag installation rate increases year by year, and the U.S. had reached 50% in 90 years, and West Europe and Japan have also reached 30%, and some country also stipulates mustn't import not install the automobile of safety air bag.

Existing air bag device is formed by sensor, gas generator and air bag.Overload signal when sensor is used for the induction collision when overload surpasses certain certain value, causes electric igniter at any time and gets angry, and the gas producing medicinal that ignites produces a large amount of gases and charges in the air bag.

CN92229132 discloses a kind of sensor device that adopts piezoceramic to make detector, its detector needs special piezoelectric device so that exert pressure, the supporting crystal needs the insulation of solution high resistant, charge discharging resisting etc. all to increase cost with inside and outside connection of circuit, and structure is comparatively complicated, used electronic igniting circuit, because of electric igniter seals in the circuit always, its safety is not high enough, may bring hidden danger to safety.

The purpose of this utility model provide a kind of simple in structure, be quick on the draw, safe and reliable, automobile collision preventing air bag device that price is lower.

Automobile collision preventing air bag device of the present utility model, comprise nitrogen gas generator, the electric transducer that is connected with the electric igniter that is arranged on the nitrogen gas generator bottom center, and the air bag that is arranged on the nitrogen gas generator top is formed, described nitrogen gas generator comprises the center-point igniting primer that is sealed in the housing centre, igniting primer is outward the combustion chamber that gas generant is housed successively, outdoor is drug blocking tube with holes, first filter layer that constitutes by galvanized iron net and glass fibre, drug blocking tube with holes, second filter layer that constitutes by dust suction and cooling agent, separation net, the flow-disturbing circle, joint bolt and packing seal, described electric transducer includes detector, the target recognition circuit, signal processing circuit, protective circuit, ignition control circuit, electronic igniting circuit and detection indicating circuit, the center-point igniting primer that it is characterized in that nitrogen gas generator is that fire transmission rate is the low velocity detonation type igniting primer of 1600～2200 meter per seconds, and second filter layer of nitrogen gas generator is by silicon dioxide of handling through paraffin wax (accounting for 1/2-2/3) and the high-effective dust-removing that constitutes through the oxalate (accounting for 1/2～1/3) that paraffin wax is handled, the cooling filter layer; Air bag is a coated polyamine fat resin on nylon cloth, is sewn into the barrel-shaped airbag in elliposoidal or garden; The detector of sensor is the accelerometer that is made of force-sensing parts, is semiconductor gauge is close on the strain beam, and an end and housing are fixed, and the other end is the free end of supporting loading.When being subjected to stress, the crystal of power sensitive semiconductor strain-gauge produces distortion, its resistance generation respective change, thereby obtain the voltage signal output that is directly proportional with acceleration/accel; The electronic igniting circuit of described electric transducer is to be in series by reservoir capacitance C1, ignition lock K2 and electric igniter H; electric igniter H two ends are connected to protection switch K1; K1 has normally closed and often opens two windings point; electric igniter H in parallel with normally closed contact and and ground short circuit, it is connected in series in the firing circuit when closed by normal opened contact.Protection switch K1 uses the dry reed relay contact, and ignition lock K2 uses thyristor.

Described target detection circuit is a kind of high pass amplifier; signal processing circuit is a kind of amplitude discriminator; protective circuit and firing circuit are a kind of switch circuits, and whether detect indicating circuit is to guide to the detection indicating device from the output of protective circuit and ignition control circuit to indicate its work normal.The circuit of above-mentioned formation electric transducer all belongs to prior art.

An electric transducer can be with a plurality of safety air bags, promotes separately gas generator and air bag work as long as two or more electric igniters are connected in parallel.

Below in conjunction with accompanying drawing automobile collision preventing air bag device of the present utility model is described further.

Fig. 1 is the structural representation of automobile collision preventing air bag device of the present utility model.

Fig. 2 is the circuit block diagram of the electric transducer of automobile collision preventing air bag device of the present utility model.

Fig. 3 is the detecting structure scheme drawing of the electric transducer of automobile collision preventing air bag device of the present utility model.

Fig. 4 is the electronic igniting circuit schematic diagram of automobile collision preventing air bag device of the present utility model.

As shown in the figure; when auto against takes place when; the quick detector 21 of power that is fixed as one with automobile; the fierce variation takes place in the acceleration signal that the perception bump contacts moment; the acceleration signal that from target information, extracts; by the target recognition circuit, elimination figure viewed from behind interfering noise signals, interfering signal is as the vibration top; impact; sudden stop or the like; useful signal is amplified; when reaching the threshold voltage position of regulation, after treated amplitude is differentiated, the trigger protection circuit working; protection switch K1 in the electronic igniting circuit is freed; the K1 normally closed contact disconnects the shunt contact of electric igniter H, and K1 normal opened contact closure is connected in series in the electronic igniting circuit electric igniter H simultaneously.This moment, electronic igniting circuit was in the ignition state for the treatment of.When the collision of damage property occurring, meet and exceed certain necessarily bigger acceleration signal by detector 21 perception bump, after the treated amplitude discriminating of target recognition circuit, just produce ignition control signal, go to trigger the electronic switch K2 conducting in the electronic igniting circuit, this moment, reservoir capacitance C just caused igniting to electric igniter H discharge.Because lighting of the center-point igniting primer 10 of gas generator, at combustion chamber 9 nitrogen generating agent 8 that ignites, the nitrogen that produces passes drug blocking tube 11 with holes, deep and thorough to first filter layer 5, most of solid residue that burning generates, being filtered layer stops, hi-heat nitrogen stream passes the filter layer 6 that is made of efficient dust suction, cooling agent again, after removing micronic dust and cooling, non-poisonous nitrogen is by separation net 13, enter air bag 3 under 14 distributional effectss of flow-disturbing circle, the housing 4 of air bag 3 and producer 2 is to connect by screw 15 and packing seal 16.Swollen the rising of airbag aeration and ejecting.This process was finished in a few tens of milliseconds.

Automobile collision preventing air bag device of the present utility model, therefore simple in structure, cost is low, is convenient to stock production because its sensor makes detector with force-sensing parts, and also safe and reliable.Because it is the center-point igniting primer of 1600～2200 meter per seconds that nitrogen gas generator uses fire transmission rate, thereby has improved speed of ignition, has shortened the reaction time.Application high-effective dust-removing, cooling agent are made second filter layer, very reduce the gas-flow temperature effectively and remove micronic dust.The nylon cloth that employing scribbles polyamine fat resin is sewn into ellipsoid formation or the barrel-shaped air bag in garden, the temperature that intensity is big and ability is higher.

Claims

1. automobile collision preventing air bag device, comprise nitrogen gas generator 2, the sensor 1 that is connected with the electric igniter 7 that is arranged on the nitrogen gas generator bottom center, and the air bag 3 that is arranged on the nitrogen gas generator top is formed, described nitrogen gas generator 2 comprises the center-point igniting primer 10 that is sealed in housing 4 central authorities, igniting primer is outward the combustion chamber 9 that gas generant 8 is housed successively, outdoor is drug blocking tube 11 with holes, first filter layer 5 that constitutes by galvanized iron net and glass fibre, drug blocking tube 12 with holes is by dust suction, second filter layer 6 that cooling agent constitutes, separation net 13, flow-disturbing circle 14, attaching screw 15 and packing seal 16; Described sensor 1 includes detector, target recognition circuit, signal processing circuit, protective circuit, ignition control circuit, electronic igniting circuit and detects indicating circuit, and the center-point igniting primer 10 that it is characterized in that described nitrogen gas generator 2 is that fire transmission rate is the low velocity detonation type igniting primer of 1600～2200 meter per seconds; Its second filter layer 6 is by the silicon dioxide of handling through paraffin wax (accounting for 1/2～2/3) and the high-effective dust-removing that constitutes through the oxalate (accounting for 1/2～1/3) that paraffin wax is handled, cooling filter layer; Air bag 3 be one on nylon cloth coated polyamine fat resin, be sewn into the barrel-shaped airbag in elliposoidal or garden; The detector 21 of described electric transducer 1 is the accelerometer that is made of force-sensing parts, is semiconductor gauge 22 is close on the strain beam 23, and an end and housing 25 are fixing, and the other end is the free end of supporting loading 24; The electronic igniting circuit of described electric transducer 1 is to be in series by reservoir capacitance C, ignition lock K2 and electric igniter H; electric igniter H two ends are connected to protection switch K1; K1 has normally closed and often opens two windings point; electric igniter H in parallel with normally closed contact and and ground short circuit, it is connected in series in the firing circuit when closed by normal opened contact.