Challenging and Future of Homogeneous Charge Compression Ignition Engines; an Advanced and Novel Concepts Review

Abstract

The potential of HCCI combustion to reduce the internal combustion engines exhaust emissions, particularly NO X and soot emissions, and to delimit the application range of this technique as well as a detailed analysis of previous and current results of combustion chemistry, emission behaviors, the challenging facing this technique, and all controlling parameters including transient states are introduced. From HCCI combustion chemistry and emissions analysis it was found that, the heavy fuels displays two-stage heat release or two stage combustion process involving low temperature oxidation (LTO) stage followed by high temperature oxidation (HTO) stage separated by a time delay between them is attributed to negative temperature coefficient (NTC), the advantage of NO X emissions reduction from HCCI engine diminishing at high load condition, HC production is reduced with increasing the engine load, and the soot ejection is negligible during all operating conditions. Valve timing, compression ratio, inlet air temperature, and EGR show an advanced control on the HCCI combustion behaviors over a wide range of speed and load. The use of EGR in HCCI operation is limited at EGR-rates about 70% at this point the reaction rates and ignition timing are so much reduced and retarded, respectively, and leads to misfiring and production of HC-emissions. Homogenization of fuel, air, and recycled burnt gases prior to ignition in addition to the control of ignition and combustion timing, and heat release rates are obstructs that must be overcome in order to realize the advantages of HCCI engine in the future.

Comparative Study of Performance and Emission Characteristics between Spark Ignition Engine and Homogeneous Charge Compression Ignition Engine (HCCI)

“…The HCCI engine has no direct means to control the timing of ignition, unlike the SI and CI engines. The SI engine has ignition timing, and CI diesel cycle engine has a fuel injection beginning, and both are controlling directly the start of combustion [7]. However, in the HCCI engine, the ignition is controlled by controlling the conditions of the charge and the cylinder walls at a time when the intake valve closes.…”

Effect of CuO Nanoparticles on Performance and Emissions Behaviors of CI Engine Fueled with Biodiesel-Diesel Fuel Blends

“…Operating direct injection diesel engine at constant speed with natural aspiration with mahua biodiesel by adding 100 ppm copper oxide of 10 and 20 nm had improved BSFC and BTE by 1.3 and .7%, respectively [38]. Causing an improve in CO, NOx, HC, and smoke emission by 4.9, 3.9, 5.6, and 2.8%, , respectively [39].…”

An overview of the Effect of using HHO on Spark ignition and direct injection engines combustion, performances, and emissions characteristics

“…Internal combustion engine vehicles will become less common over the coming decades and eventually go out of production [4,5], although research and development will keep going in the interim to make them more cost-effective and environmentally [6][7][8]. Shortly, it is anticipated [9] that both the detrimental effects of greenhouse gas emissions on the environment and our reliance on fossil fuels decrease [10][11][12][13].…”