Homogeneous charge compression ignition (HCCI) is a fuel injection advance directly to the combustion chamber in a rhythm and started roughly 180 degrees before compression top dead center, so the fuel mist mixed with air with a long period of time and then was with the ignition of the fuel charge, and the air heats the fuel ignition manual combustion, HCCI will feature similar to SI combustion, as shown in Figure 2.7 HCCI combustion can reduce nitrogen oxide emissions but reversed that result in the release of haiku.Dr carbon increases as shown in Figure 2.9, as fuel injection advance will result in some fuel mist are injected wall island within the cylinder and do not cause burns. Additionally, the HCCI combustion range also burden the engine limits the burden low and middle engine and control of working conditions still difficult, too.
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