中国电机工程学报2024，Vol.44Issue(22)：8991-9002,中插25,13.DOI:10.13334/j.0258-8013.pcsee.231914
车用功率模块热疲劳应力的高精度在线提取方法与实证
High-precision Online Extraction Method and Demonstration of Thermal Fatigue Stress of Automotive Power Modules
摘要
Abstract
As the power density and voltage levels of automotive power modules continue to rise,thermal reliability challenges have become increasingly significant..Among them,temperature stress is one of the main factors contributing to power module aging.To evaluate the thermal fatigue of vehicle power modules,it is necessary to obtain a complete load history and use the stress cycle counting method for damage statistics.However,this method poses challenges in assessing the damage information in real time during driving,and introduces delays in predictive maintenance.Based on the improvement of the standard off-line Rainflow counting method,a variable filter window width is designed for different materials and different life stages to screen and denoise the real-time junction temperature.Through the improved counting algorithm based on the"three-point double-variable range",the effective junction temperature extreme points are processed efficiently,and the full cycle and half cycle of temperature stress could be obtained.The original thermal stress counting results are clustered and stored through a discrete normalization program to meet the needs of edge computing and achieve low-cost stress cycle statistics.Finally,based on the passenger car,the feasibility of the online algorithm is tested under the actual driving road map of electric vehicles.Experimental results show that the cumulative damage degree error is less than 1%compared with the standard off-line counting method.Furthermore,the influence of temperature sampling period on stress counting and damage calculation is discussed,indicating that a sampling period of 500ms can balance both computing power and accuracy,and support real-time reliability evaluation of electric vehicles.关键词
功率模块/热机应力/雨流计数法/电动汽车Key words
power module/thermal stress/rainflow counting method/electric vehicle分类
信息技术与安全科学引用本文复制引用
项恩耀,卢倚平,罗皓泽,杨欢,王海兵,阮鸥..车用功率模块热疲劳应力的高精度在线提取方法与实证[J].中国电机工程学报,2024,44(22):8991-9002,中插25,13.基金项目
浙江省"尖兵""领雁"研发攻关计划(2022C01094) （2022C01094）
宁波市重大科技任务攻关项目(2022Z036). Research and Development Program for"Pioneer"and"Leading Goose"of Zhejiang Province(2022C01094) （2022Z036）
Ningbo City's Major Scientific and Technological Tasks Research Project(2022Z036). （2022Z036）
