Article: Performance and emission analysis of a homogeneous charge compression ignition engine fuelled with compressed natural gas Journal: International Journal of Oil, Gas and Coal Technology (IJOGCT) 2026 Vol.39 No.4 pp.504 - 522 Abstract: The present study investigates the impact of different HCCI percentages on key engine parameters such as brake thermal efficiency (BTE), volumetric efficiency, exhaust gas temperature (EGT), and gaseous emissions, including NOX, HC, and CO. A data acquisition unit (DAU) was used to control the auto-ignition timing of the HCCI mode, ensuring precise and consistent combustion at different operating conditions. The results suggest that 20% HCCI offers the best trade-off of performance and emissions, achieving high brake thermal efficiency (BTE) with minimal HC and CO emissions. Higher HCCI percentages lower BTE and volumetric efficiency due to reduced combustion temperatures and intake air displacement, while NOX emissions significantly decrease at 60%-80% HCCI, though HC and CO emissions rise beyond 40% due to incomplete combustion. CO2 emissions increase with load but decline at higher HCCI levels, whereas O2 emissions remain largely stable. HCCI technology presents a promising pathway for cleaner and more efficient engines, supporting sustainable transportation with continued refinement. [Received: 4 April 2025; Accepted: 22 May 2025] Inderscience Publishers - linking academia, business and industry through research

Title: Performance and emission analysis of a homogeneous charge compression ignition engine fuelled with compressed natural gas

Authors: Naveen Kumar; Pawan Kishore Jha; R.C. Singh

Addresses: Department of Mechanical Engineering, Delhi Technological University, Main Bawana Road, Delhi-110042, India ' Department of Mechanical Engineering, Delhi Technological University, Main Bawana Road, Delhi-110042, India ' Department of Mechanical Engineering, Delhi Technological University, Main Bawana Road, Delhi-110042, India

Abstract: The present study investigates the impact of different HCCI percentages on key engine parameters such as brake thermal efficiency (BTE), volumetric efficiency, exhaust gas temperature (EGT), and gaseous emissions, including NO_X, HC, and CO. A data acquisition unit (DAU) was used to control the auto-ignition timing of the HCCI mode, ensuring precise and consistent combustion at different operating conditions. The results suggest that 20% HCCI offers the best trade-off of performance and emissions, achieving high brake thermal efficiency (BTE) with minimal HC and CO emissions. Higher HCCI percentages lower BTE and volumetric efficiency due to reduced combustion temperatures and intake air displacement, while NOX emissions significantly decrease at 60%-80% HCCI, though HC and CO emissions rise beyond 40% due to incomplete combustion. CO₂ emissions increase with load but decline at higher HCCI levels, whereas O₂ emissions remain largely stable. HCCI technology presents a promising pathway for cleaner and more efficient engines, supporting sustainable transportation with continued refinement. [Received: 4 April 2025; Accepted: 22 May 2025]

Keywords: compressed natural gas; CNG; emission; engine performance; ethanol; HCCI diesel engine.

DOI: 10.1504/IJOGCT.2026.153755

International Journal of Oil, Gas and Coal Technology, 2026 Vol.39 No.4, pp.504 - 522

Received: 21 Mar 2025
Accepted: 22 May 2025
Published online: 26 May 2026 *

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Title: Performance and emission analysis of a homogeneous charge compression ignition engine fuelled with compressed natural gas

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