Being reliable and robust, their widespread use in commercial vehicles is, therefore, implicitly justified. Internal combustion (IC) engines today represent a class of heat engines marked by their high power-to-weight ratio, making them the suitable choice for portable power solutions. The ANN model is of utility to identify engine operating limits to avoid the ringing operation. Characterization of PPRR and its prediction using artificial neural network (ANN) in ethanol-fueled HCCI engine is also presented. Ringing operation is typically characterized by either ringing intensity or peak pressure rise rate (PPRR). This chapter also presents detailed characterization of ringing operation, and HCCI operating range of ethanol-fueled HCCI engine. This chapter presents the overview of HCCI combustion along with its numerical simulation using stochastic reactor model. Ethanol is a promising alternative to conventional fuel, especially for utilization in advanced engine combustion modes such as HCCI. Intense ringing operation in HCCI engine is one of the major challenges at high engine load conditions, which limit the HCCI engine operation range and can also damage engine parts. The homogeneous charge compression ignition (HCCI) strategy is an advanced engine combustion concept having higher thermal efficiency while maintaining the NO x and soot emission to an ultra-low level. Emission characteristics are also reviewed along with insights into PM and NOx emissions from LTC engines. Combustion characteristics of LTC engines including combustion chemistry, HRR, and knock characteristics are also touched upon in this chapter. Detailed insights into preparation of homogeneous charge by external and internal measures for diesel like fuels are discussed. This chapter reviews fundamental aspects of development of LTC engines and their evolution, historical background, and origin of LTC concept and its future prospects. However, controlling ignition timing and heat release rate (HRR) are primary challenges to be tackled before LTC technology can be implemented in automotive engines commercially. LTC technology offers prominent benefits in terms of simultaneous reduction of both oxides of nitrogen (NOx) and particulate matter (PM) in addition to reducing specific fuel consumption. LTC is radically different from conventional spark ignition (SI) combustion and compression ignition (CI) diffusion combustion concepts. Low-temperature combustion (LTC) is an advanced combustion concept for internal combustion (IC) engines, which has attracted global attention in recent years. Who knows-someday, this type of engine might be under the hood of your own car.Universal concerns about degradation of ambient environmental conditions, stringent emission legislations, depletion of petroleum reserves, security of fuel supply, and global warming have motivated R&D of engines operating on alternative combustion concepts, which have the capability of using renewable fuels. Their hope is that the engine can harness the century-plus refinement of the piston engine, along with the opposed layout's advantages, to make a clean-running new vehicle that uses the fueling infrastructure we've already got in place.Ĭheck out how this innovative new engine works. Now, engineers think they've finally perfected the opposed piston design. But for decades, we didn't have the means to control the air-fuel mix precisely enough to take advantage of the design's inherent efficiencies. It replaces the four-stroke engine's valvetrain with open intake and exhaust ports, eliminating the friction and complexity of a camshaft and valves. And their solution involves flipping the standard four-stroke engine on top of itself.Īs Wired explains, the opposed piston engine layout has long been on the minds of vehicle engineers. It has been updated to include a new video from Engineering Explained.īut now, a team of engineers is investigating a way to make a cleaner, greener internal combustion engine. This post was originally published on December 1, 2016. But with increasing pressure on automakers to build more efficient vehicles that put out fewer emissions, the future of the piston engine looks grim. Nations have considered banning fuel-burning vehicles beyond a certain future date, though none of these proposals have stuck around. It's commonly understood that the internal combustion engine has to die.
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