有限元法在安全气囊控制器开发中的应用

The Application of Finite Element Method in the Development of Airbag ECU

纯电动车的升级车型因为整车质量大幅增加,汽车碰撞的减速度曲线特征发生变化,需要重新标定安全气囊控制器(气囊ECU)。基于模拟分析经验,应用LS-DYNA有限元软件对气囊ECU标定的19项整车碰撞试验工况进行模拟,代替整车试验。项目实践显示,模拟结果与试验结果拟合较好,准确复现了汽车变形过程的减速度曲线特征,标定周期缩短70天,节省开发费用1 024.8万元。项目实践成果证明,基于经验的有限元法在气囊ECU标定中可以替代部分试验,随着该方法研究的进一步深入,将来可以应用到新车型的开发过程中。

Deceleration curve characteristics for electric vehicle collision is changed due to increasing curb weight of updated electric vehicle, airbag ECU is needed to calibrate again. In this paper, using LS-DYNA finite element method to simulate 19 test items in electric vehicle collision instead of vehicle test according to simulation analysis is introduced. The results show that the simulation results are close to the test results, which present the deceleration curve characteristics in the deformation process for the electric vehicle collision, the calibration cycle is shortened 70 days, the development cost is saved 10.248 million RMB. The finite element method is used in airbag ECU calibration instead of actual test. With the development of ECU calibration method, it can be used in the development of new models in the future.