THE STUDY ON THE CONVERSION OF SINGLE CYLINDER ENGINE INTO HOMOGENEOUS CHARGE COMPRESSION IGNITION (HCCI) ENGINE

Abstract

Scientists are interested in a homogeneous charge compression ignition combustion model (HCCI) to replace a conventional combustion model on an internal
combustion engine. This combustion model has the same performance as a direct-injection gasoline engine and the same type of ignition as a diesel engine. However,
the NOx emission component is significantly reduced, while the smoke level is almost zero. With this combustion model, it's perfectly capable of meeting emissions
requirements without having to be equipped with an additional emission after-treatment system. In this study, the author converted a traditional one-cylinder diesel
engine into a new engine based on HCCI mode. In order to be able to work in HCCI mode, it is necessary to modify the engine's parameters, such as reducing the
compression ratio, equipping it with a port fuel supply system, or combining air heating and exhaust recirculation systems. The study results have shown that the
converted engine can operate according to the principle of HCCI in low load conditions of up to 30%. The combustion characteristics and engine operation parameters
before and after conversion to HCCI mode are tested and evaluated on the engine test bed. Experimental research to quantify and assess the engine's HCCI operating
mode and construct a set of control parameters for setting and widening the working regime in HCCI mode.