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首页> 外文会议>International Conference on Mechanical Engineering and Mechanics vol.2; 20051026-28; Nanjing(CN) >Operation Performance and Running Stability of Diesel HCCI Engine
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Operation Performance and Running Stability of Diesel HCCI Engine

机译：柴油HCCI发动机的运行性能和运行稳定性

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摘要

Homogeneous Charge Compression Ignition (HCCI) engines are being considered as a future alternative for conventional engines, because they have near zero NOx and smoke emissions. But, HCCI engines also pose their own problems: difficulties in control combustion, a narrow operating regime and high hydrocarbon and CO emissions. In this paper, the effects of engine load, inlet air temperature, EGR and valve timing on HCCI engine were studied and the running stability was investigated. A scheme to achieve diesel HCCI combustion was developed, which is to directly inject diesel fuel into cylinder before the piston arrives top dead center in exhaust stroke. A new valve timing system was designed. The valve overlap duration was adjusted by it to trap more high temperature residual gas in cylinder which benefited the formation of homogeneous mixture. The experimental results showed that HCCI combustion was extremely sensitive to running conditions. With the increasing of engine load or inlet air temperature, the start of combustion was advanced; inert gases contained in the EGR could delay the auto-ignition time; larger negative valve overlap also advanced the combustion. Running stability of HCCI engine was worse at relatively low load because of misfire and at relatively high load because of knock; increasing negative valve overlap benefited running stability at relatively low load but harmed it at relatively high load.
机译：均质充量压缩点火（HCCI）发动机被认为是常规发动机的未来替代产品，因为它们的NOx和烟气排放几乎为零。但是，HCCI发动机也存在其自身的问题：控制燃烧困难，工作范围狭窄以及碳氢化合物和一氧化碳排放量高​​。本文研究了发动机负荷，进气温度，EGR和气门正时对HCCI发动机的影响，并研究了其运行稳定性。开发了实现柴油HCCI燃烧的方案，该方案是在活塞到达排气冲程的上止点之前将柴油直接喷入气缸。设计了一种新的气门正时系统。通过调节气门重叠持续时间以将更多的高温残留气体捕获在气缸中，这有利于形成均匀的混合物。实验结果表明，HCCI燃烧对运行条件极为敏感。随着发动机负荷或进气温度的升高，燃烧开始进行。 EGR中包含的惰性气体可能会延迟自动点火时间；较大的负气门重叠也可促进燃烧。 HCCI发动机的运行稳定性在较低的负荷下会由于失火而在较高的负荷下会因爆震而变差。负阀重叠的增加有利于在较低负载下的运行稳定性，但会在较高负载下对其造成损害。

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