Reliability improvement of EGR cooler based on actual environment
Taking the problem of internal leakage and cracking of a heavy truck VI emissions gas engine EGR cooler in batches in the market,through the road spectrum statistical analysis of the application scenario of the EGR cooler in the vehicle environment,combined with the physical and chemical analysis of the failed parts and the statistical analysis of the failure,the stress intensity interference model was used to clarify the direction of improving the reliability of the EGR cooler.Using CAE simulation analysis software,the temperature and thermal stress at the crack location of EGR cooler were greatly reduced by optimizing the flow field at the inlet of EGR cooler,adopting expansion joint design,selecting SUS444 steel materials and other measures.Finally,through the development of three test methods,the scheme before and after the improvement of the EGR cooler was verified"back to back".The test results showed that the reliability life of the improved EGR scheme was more than three times longer than that of the original scheme,and the improvement effect was also verified by the market.
turbocharged gas engineEGR coolerreliabilityactual environment
NETL
NSTL
万方数据
维普
