The homogeneous charge compression ignition (HCCI) engine has the potential for high efficiency and low emissions and help mitigate global climate change caused by carbon dioxide emissions. Fuel is premixed with air in the HCCI as in a spark-ignited engine, but with a high proportion of air to fuel. A feature of the HCCI engine is that it burns cooler than spark-ignited or diesel engines. Lower combustion temperature considerably reduces the emissions of nitrogen oxide. Premixed combustion in HCCI engines reduces particulate matter emissions to very low levels. Intermediate-size HCCI engines can achieve approximately 40 percent peak efficiency versus 35 percent for spark-ignited engines. Combustion in HCCI is achieved by controlling the temperature, pressure and composition of the fuel and air. Combustion control is achieved by blending hot and cold gases to obtain appropriate ignition timing and automatic control of the mixing valves is achieved using servomotors.
|Original language||English (US)|
|Number of pages||2|
|State||Published - Jul 2007|
ASJC Scopus subject areas
- Mechanical Engineering