The Development Of Smart Airbag System

As a vehicle to bring further modernization tools, it gives us life for a lot of convenience . Where there is car there is safety trouble. According to statistics,National Public Administration registered 6.71 million traffic accidents in 2000. 0.94 million people were died and 4.19 million people were injured during traffic accidents. That caused 2.67 billion RMB economic losses directly. Safety trouble is getting more and more critic with automobile possession quantity rising. Auto safety became an important reason restricting development of transportation andauto industry in our country. It is very urgent and necessary to study automotive safety.The definition: a smart adaptive airbag restraint systems, air conditioning generator out. adjust the system to achieve a collision.(1) General airbag①SRS airbag design and optimization of the conditions : temperature, dummies type seating position, steering columns, and the impact angle and speed barrier.②Airbag typical "due care" test dummies, including : changing models Seat change in the location of its journey to change the tilt angle of steering columns, the crew shift, to change the form of the collision.③Ordinary Airbag drawbacks : Initiation increase in the low-risk system, the high cost of maintenance. When the crew side (co-pilot side) position without crew, the crew does not start side airbag will save a lot of costs.(2)Smart airbag ①Smart airbag modules : the sensor signal input. signal analysis and to determine the correct action, in accordance with an appropriate adjustment to respond to the actual situation.②Smart airbag sensors vehicle ignition system : the existence of the crew, not using a safety belt, the severity of the collision. Shift crew, several environmental analysis to determine the ignition temperature of the state.③Smart airbag ECU ignition control algorithm : the ordinary type of airbag systems. ECU acceleration sensors use internal collision detection signals. In the smart airbag systems, ECU needs calculated reference pulse and collision severity level. By comparison reference sensors and signal pulse detonation threshold to make a decision.④Generator ignition types : the use of multiple ignition generator combinations will lead balloon violent initiation level. Initiation of ferocity system can be set up through the time lag between different levels of value to adjust, or, in some cases only for the purpose of regulating levels to achieve ignition.⑤Simulation : the development of the smart airbag systems, MADYMO 5.0 2D&3D is used on the basis of simulation analysis tools. Acceleration signal over a procedure with the vehicle geometry, crew position, seat belt use, Generator / module combination constitutes a MADYMO input parameters platform According to the gas generator MADYMO input in the form of changes in temperature. Quality of data that can flow from the gas generator at different temperatures in the test was to optimize the analysis. Digital simulation can be reduced development time significantly reduced development costs.General-Airbag System is a flaw in the rate of change is far less than 50KPH, many balloon will be launched. In these circumstances, the restraint system is very dangerous, it started to increase the crew were injured in the course of the danger. Smart airbag systems to effectively use the collision course of the import conditions, For example, the state of crew and vehicle environment, the aim is to play a full collision airbag system protection. In the process of designing a major consideration in the broader context of improving the performance of the system. It is not as common as air-bag system performance can not be regulated. Through induction crew and vehicle conditions change to achieve the purpose of adaptability, and the use of an electronic control unit (ECU) to identify the severity of the collision and thus to regulate gas from the generator. Therefore ECU to the actual collision-conditioning system performance. Smart safety system development more effective protection of the passengers inside the vehicle, thus significantly reducing the risk of collisions, Now is the passive vehicle safety design focus.Vehicle Crash Test comprehensive safety evaluation of automotive collision properties of the most basic and effective methods. It is protected from the crew perspective to the accident reconstruction, Analysis of vehicles to the crew before and after the collision with the vehicles movement and injury status, and use it as the basis for improving vehicle safety design, additional or improved car outside crew protection device. Meanwhile, it was Pulley collision simulation, computer simulation, etc. On the basis of testing. Through trial and auto parts Crash Test System Modeling be bound by the large amounts of data. MADYMO software based on the establishment of restraint system simulation model to test data, should seat upholstery stiffness, back stiffness and rigidity of headrests, seat belt Ribbon performance tests Volume admission seat belts for the performance tests gas generator parts test pilot. Test vehicle with the body measured by the speed curve and body structure Invasive deformation curves, as well as a reasonable model of seat belts, the mannequins model, air bag model, The initial constraint on the model established. MADYM03D modeling software needed to access the data and test and data processing. Summed up the model building some valuable methods and experience to explain the validity of the simulation model. Stability and expansion of the concept and use of model validation and verification theoretical model for the analysis. Through a lot of parameter calibration work amendment is effective, stable and the expansion model Follow-up studies to provide a reliable basis. Meanwhile, that the establishment of model parameter calibration and validation process should take note of a number of common problems and handling skills. The simulation model is used to reflect the actual study of computer models. In the simulation model analysis, must ensure that the simulation model to accurately describe the actual system and the computer will correct operation. For simulation of a specific project, assessment of the effectiveness of the model run through simulation study of the subject always. Simulation model of the system is actually a form of abstract expression to verify whether a 100% effective model is extremely difficult, there is no practical meaning. Different practical issues, the effectiveness of the model for the request is not the same. For general research issues, Model 85% of the credibility on that model is effective. Rand Corporation and affirm the Fishman at that simulation model to assess the effectiveness of including model validation (Validation) and the Model Validation ( Verification) components. Model Validation examines the system model and the simulation of the relationship between Model Validation study of the system model is the model of computer and the relations between them. Nearly 10 years, the model identified and validated simulation circles at home and abroad have received increasing attention. Occupant restraint system simulation model of the use of the MADYMO software and the modeling method Therefore system computer model to model the relationship between achieving been set, thus confirmed the validity of model is based on the actual purpose of correction system simulation model, ultimately be the one with the actual system Unification of error is less than 15% of the occupant restraint system simulation model.Proved that the simulation model in specific conditions and system configuration with the actual results of the tallies. Simulation model of input conditions to some extent changes, the simulation model output results will not be drastic fluctuations, think that the model is stable. If the actual system configuration changes, simulation model adjustment accordingly, also coincide with the actual system of smart airbag development is of great significance.