“Rudolf Diesel developed a theory that would revolutionize the engines of the day“. He envisioned an engine in which air is compressed to such a high degree that the temperature inside the cylinder rises significantly. Then, when fuel is injected into the cylinder along with compressed air, it explodes, forcing the piston down. This design was created in response to the excessive consumption of energy and inefficiency of the steam engine. “The steam engine at that time only worked at 12% efficiency”. “His design eliminated the spark plug, which was depended on by Nikolas Otto’s gasoline internal combustion engine” (Wikipedia)
Diesel filed for a patent in February of 1892 at the Imperial Patent Office in Germany. In 1893, he test ran the first model. The new engine ran at 26%