The airbag control device of protection type is judged based on weightTechnical field
The present invention relates to safety airbag technique field, and in particular to judge the air bag control of protection type based on weightDevice.
Background technology
Safe automobile air bag has saved the life of countless occupants since the birth, is affixed one's name to according to calendar year 2001 audit in U.S.A.A report of (United States GovernmentAccountability Office, US-GAO) shows, sends out in automobileDuring raw front shock, front bladders are used alone can reduce the severely injured rate of occupant 14%, and while using of seat belts and safetyAir bag can reduce the severely injured rate of occupant 50%.But, because air bag is developed based on 50 percentile adult males, optimal protected effect cannot be played to all types occupant in initiation process.
The air bag detonation when high velocity impact non-wear safety belt has injury to occupant, but if without air bagOccupant certainly will collide with automotive trim, equally can cause serious injury.And when automobile occurs low speed or middle low speed collision, do not wearThe detonation of air bag when wearing seat belt has protective effect to occupant, air bag ratio is generally speaking used alone and does not use air bagIt is low with the severely injured rate caused by seat belt.
In the U.S., between 1990-2000 years, because the mistake detonation of air bag causes altogether 162 occupant's death, wherein wrappingInclude 38 drivers not fastened the safety belt, 6 adult occupants not fastened the safety belt, 78 children of 0～11 years old, 18 babies.For this purpose, Federal Motor Vehicle Safety regulation (Federal Motor Vehicle Safety StandardsAndRegulations, FMVSS) newest clause regulations of FMVSS 208：When passenger type is baby and child less than 6 years oldWhen, the expansion of air bag need to be suppressed.Therefore, various countries expand numerous studies to smart airbag.MichaelE.Farmer et al. by occupant detection be added in the control of air bag, by occupant's feature identification be divided into passenger type identification andOccupant position follows the trail of two classes.Jilin Province, China university conducts in-depth research to occupant's detection, establishes based on low cost CMOSThe automobile of (complementary metal oxide semiconductors (CMOS), complementary metal oxide semiconductor) video camera is taken advantage ofMember's classification vision detection system and its intelligent mode recognizer.But above-mentioned smart airbag is simply by closed safe air bagTo reduce injury of the air bag to occupant, such occupant possibly cannot avoid that secondary collision occurs with inside gadget, so as to taking advantage ofMember causes serious injury.
Traditional air bag passes through external acceleration sensor acquisition acceleration signal, then through specific algorithm meterCalculate, reach the condition of detonation
After will firing safety air-bag.This air bag has following shortcoming：
1) None- identified passenger type, causes detonation by mistake to cause occupant's major injury；
2) seat belt situation cannot be perceived, causes occupant's heavy casualties；
3) dynamic air bag parameter cannot be adjusted, it is impossible to reach the optimum protection to all kinds of occupants.
The content of the invention
The present invention be to provide for it is a kind of recognize passenger type using passenger size, then dynamic changes rising for air bagQuick-fried parameter, so as to reach the control system of safety air bag of the optimum protected effect to occupant.
The airbag control device that weight judges protection type, including safety airbag ECU, safety airbag ECU should be based onRespectively with acceleration transducer, seat belt sensor, seat pressure transducer, vehicle speed sensor, safety belt pretensioner, masterSecondary air bag is connected and external power source.
Safety airbag ECU include main control chip, main control chip respectively with A/D converter, sensor acquisition module, power supply pipeReason module, ignition control module and the connection of air bag parameter control module；Acceleration transducer is connected with A/D converter；PassSensor acquisition module is connected respectively with seat belt sensor, seat pressure transducer and vehicle speed sensor；Power management mouldBlock is connected with external power source；Ignition control module is connected with safety belt pretensioner, major-minor air bag.
Ignition control module is also connected with safety warning device.
Safety airbag ECU also includes communication module, and main control chip is connected by communication module with external network.
The system gathers passenger size information using seat pressure transducer, and recognizes passenger type accordingly, and merges manyRoad external sensor information, enables ECU according to different passenger types and sensor information adjust automatically air bagThe parameters such as bleeder port size, detonation moment, mass flowrate, drawstring length, so as to equal to different type occupant in collision accidentReach best protection effect.
Description of the drawings
Fig. 1 is the structural representation of the present invention.
Specific embodiment
The specific embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
As shown in figure 1, this judges the airbag control device of protection type, including safety airbag ECU based on weight,Safety airbag ECU respectively with acceleration transducer, seat belt sensor, seat pressure transducer, vehicle speed sensor, safetyBand preloader, major-minor air bag are connected and external power source.
Safety airbag ECU include main control chip, main control chip respectively with A/D converter, sensor acquisition module, power supply pipeReason module, ignition control module and the connection of air bag parameter control module；Acceleration transducer is connected with A/D converter；PassSensor acquisition module is connected respectively with seat belt sensor, seat pressure transducer and vehicle speed sensor；Power management mouldBlock is connected with external power source；Ignition control module is connected with safety belt pretensioner, major-minor air bag.
Ignition control module is also connected with safety warning device.
Safety airbag ECU also includes communication module, and main control chip is connected by communication module with external network.
The master chip of ECU adopts the microprocessor of 16 bit of Freescale (Freescale), the processor to be integrated with A/D and turnChange unit, communication unit and memory element.Acceleration transducer adopts the double-axel acceleration sensor of Freescale, Ke YitongWhen detect the acceleration of X-direction and Y direction.The air bag that igniting unit employs German Infineon (Infineon) is specialWith Ignition chip, it drives two functions comprising power management and igniting.
External sensor module.Including outside vehicle crash sensor, belt buckle sensor, seat pressure transducerAnd vehicle speed sensor.During being collided due to vehicle, mainly by vehicle both sides longeron energy absorption, therefore outside vehiclePortion's sensor is installed on engine support outside.
Non- wear safety belt is the main cause that air bag causes adult's injures and deaths.Belt buckle sensor uses dry springPipe is perceived, when safety airbag ECU detects the non-wear safety belt of occupant, should adjust air bag external parameter orSuppress the detonation of air bag, so as to avoid that unnecessary injury is caused to occupant.Seat pressure transducer can perceive seatOn occupant, prevent by mistake detonation from causing unnecessary economic loss.The speed of service of vehicle speed sensor detection collision vehicle in front is rightAir bag acceleration algorithm carries out auxiliary calculating.
Air bag parameter change actuator.By software emulation it is recognised that when protection is optimal, difference is taken advantage ofAir bag parameter required by member's type is not fully identical.So, by the optimized parameter required by each passenger typeIn being written to air bag control unit.After occupant is taken behind seat, and vehicle is powered, seat pressure transducer real-time detection goes outOccupant weight, and have the more specific weight values of main control chip to draw passenger type.When passenger type changes, main control chip will be taken advantage ofMember's categorical data passes to air bag control unit by communications protocol.When passenger type changes, ECU can sendCorresponding output signal control exterior operator action.Bleeder port size is carried out by using electro shape memory compositeChange, electro shape memory composite can change size by changing the voltage for being carried in its own, so as to control peaceThe size of full air bag bleeder port.Mass flowrate curve is adjusted using twin-stage or multi-stage gas generators, by adjusting multi-level gasGenerator firing interval is so as to changing mass flowrate curve shape.Air bag webbing length can be rolled up by motorReceive, ribbon end is fixed on motor, by motor webbing length is accurately furled and discharged.And safetyThe air bag detonation moment can be by software delay control.
We employ 2 kinds of modes and smart airbag control system are verified：Using being manually entered the outer of simulationPortion's signal and verified by sled test.
Mode 1 is using the external signal for being manually entered simulation.Will existing chassis crash acceleration data input to letterIn number generator, the car crass accelerating curve of simulation is then produced by signal generator.Meanwhile, set external sensorState, smart airbag control system collection acceleration signal and sensor state, according to obtain member type,Drive corresponding air bag parameter change actuator.
According to measurement, the system can export predetermined drive signal according to passenger type, it is possible in optimum ignitingCarve and nearby lighted a fire.Can be cost-effective during early development by the way of simplation verification.
The sled test of mode 2 is verified.The chassis car weight is 536kg, is carried out under the speed of 30km/h and 42km/h respectivelyImpact test.
Result of the test shows：The intelligence control system can effectively gather acceleration signal and outer during actual collisionPortion's sensor signal, and output parameter detonates to air bag when chassis collides 26ms.