However, it injects fuel later, during the compression stroke. Stratified charge compression ignition also relies on temperature and density increase resulting from compression. However, rather than using an electric discharge (spark) to ignite a portion of the mixture, HCCI raises density and temperature by compression until the entire mixture reacts spontaneously. Modern direct injection diesel engines combine stratified charge (SC) with compression ignition (CI), abbreviated as SCCI.Īs in HCSI, HCCI injects fuel during the intake stroke. Gasoline engines combine homogeneous charge (HC) with spark ignition (SI), abbreviated as HCSI. HCCI combines characteristics of conventional gasoline engine and diesel engines. As in other forms of combustion, this exothermic reaction releases energy that can be transformed in an engine into work and heat. Homogeneous Charge Compression Ignition ( HCCI) is a form of internal combustion in which well-mixed fuel and oxidizer (typically air) are compressed to the point of auto-ignition.
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