Influence Of Injection Timing On Hcci Engine Operated With Renewable Fuels
Authors: Vijaykumar Totad, V. S. Yaliwal, N. R. Banapurmath, Suneelkumar N. Kulkarni, Praveen Harari
DOI: 10.87349/JBUPT/281021
Page No: 1-6
Abstract
Homogeneous charge compression ignition (HCCI) engines offer high thermal efficiency and ultra-low emissions, but their performance is highly sensitive to fuel properties and injection timing. This study investigates the influence of injection timing on the combustion, performance, and emission characteristics of an HCCI engine fueled with renewable alternatives, including biodiesel, bioethanol, and biogasoline blends. Experiments were conducted across a range of injection timings to evaluate their effects on ignition delay, heat-release patterns, in-cylinder pressure, brake thermal efficiency, and emissions such as NOx, CO, HC, and particulate matter. Results indicate that advancing injection timing enhances mixture homogenization and stabilizes early combustion, yielding improved thermal efficiency but potentially elevating peak pressures. Retarding injection timing delays the start of combustion, reducing NOx formation but increasing unburned HC and CO due to incomplete oxidation. Renewable fuels, with their higher oxygen content and distinct physical properties, showed improved combustion stability and reduced soot formation across all timings, though optimal performance was achieved at moderately advanced injection settings. Overall, the study highlights that careful optimization of injection timing is essential for maximizing the benefits of renewable fuels in HCCI engines, enabling cleaner and more efficient operation while addressing combustion phasing challenges.
