Homogeneous Charge Compression Ignition (HCCI) Combustion: Combustion Process and Control Strategies

Homogeneous Charge Compression Ignition (HCCI), a low temperature combustion technology, is believed to be a promising technology due to low NOx and PM emissions and better fuel economy. HCCI combustion can realize homogeneous charge preparation in the cylinder and promote combustion auto-ignites in multiple spots by cooperative control of fuel chemistry and boundary conditions, such as Intake temperature, pressure, mixture concentration and EGR, which can short the flame propagation distance and accelerate the ignition and combustion speed. HCCI combustion control technology can be divided into two categories: one is to change the air/fuel mixing characteristics; the other is to change the working and design parameters of the engine. This paper reviews the establishment, improvement and development of HCCI combustion indirect control technology through the experimental research results of researchers in recent years.