HN Theater has aggregated all Hacker News stories and comments that mention Engineering Explained's video "Is 'Entry Ignition' The Future Of Combustion Engines?".
Youtube Summary
Can Entry Ignition Save Combustion Engines? New Efficient Technology! How Entry Ignition (EI) overcomes the flaws of SI, CI, and HCCI engines. Why Combustion Engines Ain't Dead Yet - https://youtu.be/Hatav_Rdnno How Mazda's SPCCI Engine Works: https://youtu.be/yNSxow3W7ek
How do Entry Ignition (EI) engines overcome the biggest flaws of combustion engines? We know that Spark Ignition (SI) engines are inefficient, we know that Compression Ignition (CI) engines have bad emissions, and we know that Homogeneous Charge Compression Ignition (HCCI) engines are very difficult to control. The closest thing we have today are prototype engines using Mazda's Spark Controlled Compression Ignition (SPCCI), but even they still use spark plugs for transient engine conditions, and use spark plugs to initiate compression ignition. Entry Ignition is an all-new method of combustion that seeks to solve the problems of other combustion methods. How does it work? Watch the video to learn all about it!
Source/More Info: Cheeseman, P., "A New Efficient Combustion Method for ICEs," SAE Technical Paper 2020-01-1314, 2020, https://doi.org/10.4271/2020-01-1314. https://www.sae.org/publications/technical-papers/content/2020-01-1314/
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The theoretical efficiency gain appears to be greater than the stated 14%. The article cites a video [1] which in turn cites 49% vs 63% maximum theoretical thermal efficiency for a traditional engine and for the Entry Ignition engine, respectively. That makes it a 14 percentage point increase which is 29% increase in efficiency.
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