Diesel's original engine was a four-stroke, compression-ignition engine that used a coal dust fuel. The engine was not very successful, but Diesel continued to work on it. In 1897, he developed a new engine that used a liquid fuel, which was much more efficient than the coal dust engine.
Diesel's new engine quickly became popular, and it was soon used in a variety of applications, including ships, trucks, and cars. Diesel engines are still widely used today, and they are considered to be one of the most efficient types of internal combustion engines.
Diesel died in 1913, but his legacy lives on. The diesel engine is a major part of the modern world, and it has had a profound impact on the way we live.