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首页> 外文期刊>Chinese science bulletin >Study the ethanol SI/HCCI combustion mode transition by using the fast thermal management system
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Study the ethanol SI/HCCI combustion mode transition by using the fast thermal management system

机译：使用快速热管理系统研究乙醇SI / HCCI燃烧模式的转变

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摘要

In this paper the ethanol homogeneous charge compression ignition (HCCI) is achieved in a modified single cylinder engine by means of a self-developed fast thermal management system (FTMS), and the ethanol SI/HCCI operation regions are defined. It canbe concluded that the thermal efficiency is higher and the NO_x emission is lower in the HCCI operation region. In addition, the maximum NO_X emission drops by 98%. The ethanol SI/HCCI combustion mode transition is conducted in different conditions nearthe SI/HCCI operation boundaries. It is likely to realize the transition by the utilization of FTMS. However, it is impossible to complete the transition within one operating cycle under current operation conditions. There are fluctuations in engine speed and brake mean effective pressure during the transition process. In order to reduce the fluctuations during the transition, the initial work concerning the effects of the spark ignition on the transition smoothness is carried out and the investigationindicates that the engine speed and brake mean effective pressure fluctuations cannot be eradicated only through spark ignition. Therefore, the control strategies combined with other factors should be further optimized.
机译：本文通过自行开发的快速热管理系统（FTMS）在改进的单缸发动机中实现了乙醇均质充量压缩点火（HCCI），并定义了乙醇SI / HCCI操作区域。可以得出结论，HCCI操作区域的热效率较高，NO_x排放较低。此外，最大的NO_X排放量下降了98％。乙醇SI / HCCI燃烧模式的转换是在SI / HCCI操作边界附近的不同条件下进行的。利用FTMS可能会实现过渡。但是，在当前的运行条件下，不可能在一个运行周期内完成转换。在过渡过程中，发动机转速和制动器平均有效压力会有波动。为了减小过渡期间的波动，进行了关于火花点火对过渡平滑度的影响的初步工作，并且研究表明，仅通过火花点火不能消除发动机转速和制动平均有效压力波动。因此，应结合其他因素进一步优化控制策略。

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