Air injection engine

…However, the engine that he commercialized in 1896 with the cooperation of the Augsburg Machine Works and the Krupp Company was not an isothermal combustion engine, but a constant pressure combustion four-stroke engine. Also, to achieve good combustion, it is important to atomize the fuel finely, but at that time there was no precision machining technology for pumps that could highly compress the fuel, so he had to use a method of injecting the fuel with compressed air (air injection engine). As such, the original diesel engines had air compressors and were slow, so they had a large weight and volume per horsepower, and were developed as stationary engines and marine engines, and two-stroke and double-acting engines were also developed to be large and powerful. …

*Some of the terminology used to refer to "air injection engines" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…しかし，その後96年に彼がアウクスブルク機械製作所とクルップ商会の協力の下に商品化した機関は等温燃焼ではなく，等圧燃焼の4サイクル機関であった。また，良好な燃焼を得るためには燃料を細かく霧化することが重要であるが，当時は燃料を高圧縮するポンプの精密加工技術がないため，彼は圧縮空気で燃料をふき込む方法(空気噴射式機関)をとらざるをえなかった。　このように当初のディーゼルエンジンは空気圧縮機付きで，かつ低速のため，馬力当りの重量，容積が大きく，定置機関，舶用機関として発達し，2サイクル式，複動式機関も開発され，大型･大出力化された。…

※「空気噴射式機関」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報