Homogeneous charge compression ignition (HCCI) is a new combustion technology that may develop as an alternative to diesel engines with high efficiency and low NOx and particulate matter emissions.The homogenous charge compression ignition (HCCI) is a promising new engine technology that combines elements of the diesel and gasoline engine operating cycles. HCCI as a way to increase the efficiency of the gasoline engine. The attractive properties are increased fuel efficiency due to reduced throttling losses, increased expansion ratio and higher thermodynamic efficiency. with the advantages there are some mechanical limitations to the operation of the HCCI engine. The implementation of homogenous charge compression ignition (HCCI) to gasoline engines is constrained by many factors. The main drawback of HCCI is the absence of direct combustion timing control. Therefore all the right conditions for auto ignition have to be set before combustion starts. This paper describes the past and current research done on HCCI engine. Many research got considerable success in doing detailed modeling of HCCI combustion. This paper aims at studying the fundamentals of HCCI combustion, the strategy to control the limitation of HCCI engine. and finding optimum operating conditions for HCCI engine operation. The purpose of this paper is to work on the combustion timing and the engine operating zone for HCCI engines. Four main areas of timing control were identified in an investigation of the available literature: thermal control through exhaust gas recirculation (EGR), variable compression ratio (VCR), variable valve timing (VVT), and fuel mixtures or additives. To investigate HCCI Combustion Process a detail CFD (Computational Fluid Dynamics ) approach will be used to limit the drawback of HCCI Engine.

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HCCI diesel engine combustion CFD