基于微粒捕集器監(jiān)測(cè)的柴油機(jī)排氣特性參數(shù)研究
[Abstract]:With the increasingly stringent emission regulations in the world, diesel particulate traps have been widely used in diesel engine aftertreatment at home and abroad because of their good filtration effect and low environmental requirements. However, due to long-term use or improper use, the particle trap will be blocked and broken. At present, there is little research on particle trap monitoring. Therefore, it is necessary to study the exhaust characteristics of diesel engine based on diesel particulate trap monitoring. A simulation model of diesel engine, diesel vehicle and particle trap was established by using engine performance simulation software GT-Power. In this paper, the exhaust temperature characteristics of diesel engine under steady and road conditions are studied by using the established simulation model, and the influence of particle trap on exhaust temperature of diesel engine is analyzed. The analysis shows that the exhaust temperature of diesel engine is insensitive to the amount of particulate deposition in the particulate trap under steady and road conditions. The variation of exhaust pressure, another important parameter in diesel engine exhaust characteristics, is studied. From the study of exhaust pressure characteristics of diesel engine under steady and road conditions, it is concluded that the exhaust pressure at the front end of the particulate trap and the exhaust pressure difference between the two ends of the particle trap can be used as the characteristic parameters of the particle deposition quantity in the particle trap. Under steady condition, the influence of particle deposition on exhaust pressure is analyzed from two aspects: average exhaust pressure and exhaust pressure spectrum. The analysis shows that the characteristic frequency amplitude of exhaust pressure spectrum is better than the average exhaust pressure as the characteristic parameter of particle deposition in particle trap. The influence of the state of diesel particulate trap on exhaust noise is also studied by simulation and experimental research. The effect of particle deposition on exhaust noise in particulate trap is studied by simulation. The results show that the amplitude of exhaust pulsation frequency in exhaust noise spectrum decreases with the increase of particle deposition in particulate trap. It can be considered that the particle deposition of the particle trap can be monitored by monitoring the amplitude of the exhaust pulsation frequency. The influence of the damage degree of particulate trap on the exhaust noise is studied by experimental method. The results show that the amplitude of the frequency component at the exhaust pulsation frequency in the exhaust noise spectrum increases with the increase of the damage degree of the filter body of the particulate trap. The amplitude of the frequency component will increase at twice the frequency of exhaust pulsation, so we can consider monitoring the damage degree of the particle trap by monitoring the sum of the two. Under certain experimental conditions, the frequency at the peak of the exhaust noise spectrum decreases with the increase of the filter body breakage degree. It can be considered to monitor the filter damage degree by monitoring the variation of some frequencies in the exhaust noise spectrum. The research work of diesel engine exhaust characteristics based on particulate trap monitoring can provide some basis for monitoring the state of diesel particulate trap blockage or breakage. And it can lay a certain foundation for the engineering research in the future.
【學(xué)位授予單位】:北京交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TK421
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