Abstract
Homogeneous charge compression ignition (HCCI) is nowadays a leading trend in the development of gasoline internal combustion engines. The application of this novel combustion system will allow to comply with future legislations concerning the exhaust emissions including carbon dioxide. This paper presents a design and implementation of a research engine with a direct fuel injection and the capability of HCCI combustion via an internal gas recirculation and a negative valves overlap (NVO). The technical approach used in the engine allowed an autonomous HCCI operation at variable loads and engine speeds without the need of a spark discharge. Experiments were conducted at a wide range of valve timings providing data which allowed an assessment of a volumetric efficiency and exhaust gas recirculation (EGR) rate. Permissible range of air excess coefficient, providing stable and repeatable operation has also been identified. The use of direct gasoline injection benefited in the improvement of the start of the combustion (SOC) and heat release rate control via the injection timing.
Highlights
A combustion system which utilizes auto-ignition of homogeneous in-cylinder charge (HCCI) is a combination of two well known basic principles of internal combustion engines operation
This paper presents the results of the research of gasoline controlled auto-ignition engine which uses negative valves overlap technique
The design of a research engine presented in this paper let the authors realize an extensive research into gasoline controlled auto-ignition
Summary
A combustion system which utilizes auto-ignition of homogeneous in-cylinder charge (HCCI) is a combination of two well known basic principles of internal combustion engines operation. Feeding a cylinder with homogeneous mixture, typical of spark ignition engines, and its compression ignition, typical of Diesel engines, allowed to develop a third combustion system The application of this novel combustion technique resulted in uncompromising improvement of working cycle efficiency and reduction of engine-out emissions of nitrogen oxides as well as particulates. Development of HCCI technology seems to be the only solution for the combustion engines which is capable of complying with future legislations concerning carbon dioxide and exhaust emissions. Great advantages of this combustion system were discovered accidentally during a research into knock combustion phenomenon in the seventies of the last century.
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