Exploring the Impact of Exhaust Back Pressure on Variable Compression Ratio Diesel Engines: A Critical Review

Abstract

There is a growing need to thoroughly understand the influence of exhaust back pressure (EBP) in Variable Compression Ratio (VCR) engines, as it directly affects the performance and emissions of the engine. Understanding how EBP is influenced by factors such as the VCR can lead to more efficient engine designs and operations. It can also help in optimizing combustion and emissions control strategies, ultimately leading to improved overall engine performance. Several studies have investigated the impact of EBP on the performance of internal combustion (IC) engines. However, this review paper presents several vital factors that contribute to the increase in EBP in IC engines. Factors such as exhaust system design (emission considerations, energy recovery, manifolds, and pipes), Exhaust Gas Recirculation (EGR) system (enhancement methods), and VCR system (design technological advancements) are all critically evaluated. The review further discusses methods to enhance or design these factors in a way that reduces EBP, improves engine performance, and reduces emissions.