Editing Diesel engine (section)

====Constant pressure====
By June 1893, Diesel had realised his original cycle would not work, and he adopted the constant pressure cycle.<ref name="Sass_1962_402" /> Diesel describes the cycle in his 1895 patent application. Notice that there is no longer a mention of compression temperatures exceeding the temperature of combustion. Now it is simply stated that the compression must be sufficient to trigger ignition.<ref name="Diesel_1898" /><ref name="Diesel_1893" /><ref name="e-rara.ch" />

{{blockquote|1. In an internal-combustion engine, the combination of a cylinder and piston constructed and arranged to compress air to a degree producing a temperature above the igniting-point of the fuel, a supply for compressed air or gas; a fuel-supply; a distributing-valve for fuel, a passage from the air supply to the cylinder in communication with the fuel-distributing valve, an inlet to the cylinder in communication with the air-supply and with the fuel-valve, and a cut-oil, substantially as described.}}

In 1892, Diesel received patents in [[German Empire|Germany]], [[Switzerland]], the [[United Kingdom of Great Britain and Ireland|United Kingdom]], and the [[United States]] for "Method of and Apparatus for Converting Heat into Work".<ref name="Diesel_1892" /> In 1894 and 1895, he filed patents and addenda in various countries for his engine; the first patents were issued in [[Spain]] (No.&nbsp;16,654),<ref>{{patent|ES|16654|"Perfeccionamientos en los motores de combustión interior."}}</ref> [[France]] (No.&nbsp;243,531) and [[Belgium]] (No.&nbsp;113,139) in December 1894, and in [[Germany]] (No.&nbsp;86,633) in 1895 and the [[United States]] (No.&nbsp;608,845) in 1898.<ref name="Diesel_1895_2" />

Diesel was attacked and criticised over several years. Critics claimed that Diesel never invented a new motor and that the invention of the diesel engine is fraud. Otto Köhler and {{ill|Emil Capitaine|de}} were two of the most prominent critics of Diesel's time.<ref name="Sass_1962_486" /> Köhler had published an essay in 1887, in which he describes an engine similar to the engine Diesel describes in his 1893 essay. Köhler figured that such an engine could not perform any work.<ref name="Sass_1962_399" /><ref name="Sass_1962_400" /> Emil Capitaine had built a petroleum engine with glow-tube ignition in the early 1890s;<ref name="Sass_1962_412" /> he claimed against his own better judgement that his glow-tube ignition engine worked the same way Diesel's engine did. His claims were unfounded and he lost a patent lawsuit against Diesel.<ref name="Sass_1962_487" /> Other engines, such as the [[Hot-bulb engine|Akroyd engine]] and the [[Brayton engine]], also use an operating cycle that is different from the diesel engine cycle.<ref name="Sass_1962_400" /><ref name="Sass_1962_414" /> [[Friedrich Sass]] says that the diesel engine is Diesel's "very own work" and that any "Diesel myth" is "[[falsification of history]]".<ref name="Sass_1962_518" />