Study on Factors Affecting Temperature Rise in Diesel Engine DTI Test
At present,the national six and off-road stage four regulations are more and more strict on the particle limit in diesel exhaust,and the comprehensive performance requirements of particle catcher DPF are very strict.One of them is that in the regeneration process,when the vehicle suddenly drops to idle speed,the exhaust flow decreases in-stantly,and the temperature in the DPF is very high,the heat cannot be discharged quickly,resulting in a rapid increase in the internal temperature of the DPF.It is very difficult to test the heat resistance of DPF carrier.If the heat resistance and temperature limit of DPF are not found out and a safe carbon accumulation amount of DPF is determined,a very high failure rate may be generated in the later market,resulting in increased cost and reduced reputation.Therefore,it is nec-essary to verify and find out the heat stress performance and durability of the carrier.DTI test is a method to test the high temperature resistance of DPF.Studying the influencing factors of DTI test is helpful to better control the test process,a-void the factors of test failure,improve the success rate of test,and reduce the cost of repeated test and test cycle.
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