Diesel engines can operate with 4-cycle and 2-cycle cycles. 2-stroke engines do not consume more fuel than engines with 4-stroke cycles, because the cylinder is swept with pure air and not with the fuel mixture. This is the reason why there is no loss of fuel through the exhaust.
Origins of the diesel engine
The compression ignition engine is based on the work of Rudolf Diesel, which made its first engines around the year 1892. In this type of engine, the combustion is carried out at constant pressure, according to the cycle that has taken the name of its inventor.
At the time of designing the diesel engine, Rudolf Diesel was looking for an alternative to the steam engines of the time. The problem with steam engines was its low efficiency, its high weight and its cost. To develop its project, it experimented with the use of other types of fuels. Its objective was to design a thermal engine with a high thermal efficiency, with the use of alternative fuels.
The design of the diesel engine was characterized by starting the ignition of the fuel by compression of the fuel. Thus it was that at the end of the 19th century, in the year 1897, MAN produced the first engine according to the studies of Rudolf Diesel.
Rudolf Diesel, patented this technology in 1892 in Germany, Switzerland, the United States and the United States
Fuel of a diesel engine
The fuels used are liquid hydrocarbons with characteristics lower than the fuel used in the less volatile spark ignition engines. The specific weight of these fuels is higher, for this reason they are called heavy fuels. The most notable type used for automobile engines is diesel.
The fuel used, in addition to diesel, can be fuel oil, treated oils (such as biodiesel or other biofuels) or coal dust. The common feature of fuels for diesel engines is that they spontaneously ignite when subjected to high pressures.
The fuel is fed exclusively by injection.
Use of diesel engines
Diesel engines are similar, in importance and variety of applications, to Otto engines (spark ignition). The diesel engines belong to this vast category of large slow diesel engines for fixed and naval installations, as well as the fast diesel engines used in land locomotion and light vessels.
It is necessary to consider as diesel engines the hot-head engines also called semi-diesel. These have, however, a limited number of applications in the field of fixed installations, agricultural tractors and some types of vessels, but tend to be supplanted by fast diesel engines and by Otto (spark ignition) engines.