The diesel engine, with more than 100 years, has undergone many changes: the basis of its operation is the same, looking for thermal efficiency and low consumption.
The diesel engines are still prevalent, although it increasingly persecuted, and gasoline engines are increasing their market share on diesel. But do we know how a diesel engine works, and what are its main differences with gasoline? We will explain how a diesel engine works, so that you know these differences and can better choose your next car. At least, when it comes to mechanics.
To begin, we will locate the origin of diesel engines. The engineer Rudolf Diesel developed these in the year 1893. Diesel worked for MAN, a company that already at that time manufactured engines of high power to move large vehicles. And from that idea came the need to create a motor with higher thermal efficiency. Finally, the explosion of one of its experimental engines caused severe injuries to the engineer and his assistants. Luckily, the work continued and paid off.
Diesel engine operation: diesel cycle
The diesel engine shares most of the mechanics with those of gasoline, although it works differently. It works in four stages, just like those, but the way to produce diesel combustion is different, and in this lies its difference. These are the four times with which combustion engines work:
Intake: This first time, the intake valve is opened, letting it into the air and moving the piston down. The piston path takes it to the lowest part, allowing the entire space to fill with air.
Compression: In the second time, the piston rises again, and its action causes the air to compress. So that its temperature increases, preparing the arrival of the fuel, which is responsible for running the engine.
Combustion: As the air is compressed, and at a specific time, the injection of the pulverized fuel takes place. When it comes into contact with the compressed air, it increases its temperature until it reaches between 700 and 900 degrees Celsius, turns on, and makes Let the piston go down.
Exhaust: The combustion of the fuel causes the residual gases to appear, which are evacuated from the engine using the exhaust valve. While the air that re-enters pushes them through it, leaving the space clean and ready to start the cycle again. The gases pass to the exhaust, where the filters treat that the diesel vehicle equips to prevent contaminating gases from reaching the atmosphere.
This type of engine has no spark since combustion occurs. When the pulverized fuel contacted with the compressed air, it makes a much more efficient engine than the way to produce that explosion in a gasoline engine. Of course, not only does it require the motor walls to be thicker and more resistant. But it also has to have several elements to produce the proper pressure for its operation.
More thermal efficiency, but higher air pollution
The fuel is cheaper, and its energy is better than that provided by gasoline. The diesel engine works at fewer revolutions and, therefore, can have a longer life. It requires less maintenance, although breakdowns are more expensive to repair. Also, we all know what is happening with diesel engines. Pollution is higher in NO x levels (atmosphere) and is causing many cities to consider banning the use of cars with diesel engines.
However, some believe that diesel technology will improve and get rid of disappearing as a result of regulations.
Differences between the gasoline engine and diesel engine
The main difference between a gasoline engine and a diesel engine is fuel. Initially, diesel engines were built to use with the same fuel used for street lighting, a more robust and cheaper fuel than gasoline. This conclusion was confirmed as a more efficient fuel for heavy transport and soon for smaller and accessible vehicles, cars. It is less refined than gas and emits more impurities after combustion.