AN EXPERIMENT INVESTIGATION OF LOAD CONTROLLABLE OF GASOLINE HOMOGENEOUS CHARGE COMPRESSION IGNITION

Abstract

Current research on internal combustion engines is highly focused on mitigating fuel consumption and reducing harmful emissions. Low-temperature
combustion (LTC) has emerged as a promising solution in this regard, offering significant advantages in terms of both efficiency and emissions reduction capabilities.
Gasoline compression ignition engines operate with low-temperature combustion, and the Homogeneous Charge Compression Ignition (HCCI) method, particularly,
holds great potential for efficiency improvements. In this study, the influence of equivalence ratio parameters on the combustion characteristics within the operating
range of HCCI engines using PRF80 gasoline fuel was investigated. The original engine, a diesel engine, was utilized in experiments to explore the combustion model
involving HCCI. PRF80 fuel, possessing characteristics equivalent to gasoline with a high octane number, was chosen for the study. The results indicate that the
equivalence ratio can effectively control the engine load, but the load range is limited, ranging from 1.5 to 3.5bar IMEP. The equivalence ratio significantly affects the
combustion characteristics of the HCCI combustion model, including the start of combustion, pressure rise rate, and engine noise. The research findings highlight the
suitable equivalence ratio for operational conditions such as engine speed and intake conditions (pressure, intake air temperature).