How Does a Diesel Engine Work?

Mech4cars.com – How Does a Diesel Engine Work? – The way a diesel engine works is different from a gasoline engine. Because diesel engines are different from diesel engines, maintenance is also different. Before the data came about electric cars and cars with renewable energy goals, the automotive world had two types of internal combustion engines in a car. The two internal combustion engines are petrol and diesel engines.

Diesel Engine Work

For gasoline engines, it is clear that we know that this machine uses gasoline as the name suggests. What about diesel engine fuel? Of course, using diesel fuel. Types of diesel vehicles are not as much as gasoline cars for passenger vehicles. Trucks and buses are the most widely used diesel engines. Because the fuel and use are very different, then does the diesel engine have a different way of working?

How Does a Diesel Engine Work?

But before that, we need to know that diesel engines are not only used for large vehicles. There are a number of passenger car options that also use this engine – though their numbers are very limited. People know diesel engines as machines that are strong and reliable, along with information about how diesel engines work which is interesting for us to discuss in depth. Want to know more about this diesel engine? Let’s see the summary.

In the work of a diesel engine, there are 4 steps while the engine is working. Of course, each step is mutually sustainable so as to deliver maximum performance. These are the 4 working steps of a diesel engine.

Diesel Engine Work
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Read more: Important Parts of Common Rail Diesel Engines

1. Suction Step

This step works with air entering the combustion chamber through the inlet valve. This condition can occur because the piston moves from TDC to BDC. Of course, the condition of the exhaust valve is still closed when this step starts working while the inlet valve will be fully open.

This is different from a gasoline engine where the fuel will enter along with fresh air when the suction step takes place. Even so, some gasoline engines do not enter fuel through the inlet valve but instead spray it directly into the combustion chamber.

2. Compression Step

The second step is the compression stroke. As the name implies there is a compression process in a diesel engine due to the process of compressing air by the piston. In this stroke, the piston moves from BDC to TDC. The inlet valve and exhaust valve are both closed as well. That way, it will cause air pressure and temperature to rise.

The diesel engine compression value is clearly greater than gasoline engine compression. We don’t need to calculate how big the comparison is between the two values. We can imagine that the piston in a diesel engine only compresses air. To be able to ignite diesel fuel, it obviously requires very large compression so that the fuel can burn completely. With this high compression, in a diesel engine, the constituent materials starting from the piston, piston ring, cylinder, and of course the cylinder head have better quality in terms of withstanding compression pressure.

3. Work Steps

The third step is the work step. This step also relates to the question of when does the combustion process occur in a diesel engine? In the work step the process starts running. In this process, both the inlet and exhaust valves are still closed. Moments before this step ends, the nozzle will spray fuel into the combustion chamber. Because the temperature in the combustion chamber is very high, combustion will naturally occur in the combustion chamber.

Note: the nozzle sprays fuel into the combustion chamber depending on the design of each manufacturer’s diesel engine. Some will set the fuel sprayed by the nozzle a few degrees before the piston reaches TDC. However, some manufacturers also design diesel engines with a different method, namely the nozzle sprays fuel a few degrees after the piston has passed TDC.

Read more: Common Rail Diesel Doesn’t Need These Components

Obviously, in this step, the piston will move from TDC to BDC. Due to a large amount of energy from the combustion of fuel and air in the talent chamber, the piston carries a very large amount of mechanical energy. As a result, if the energy spreads to the transmission and finally to the wheels, the car will move easily. From this we can understand that there is a change in energy in several phases, starting from chemical energy, piston mechanical energy, to the energy of the vehicle’s motion.

4. Step Discard

This is the last step of the diesel engine work cycle. This step is actually the opposite of the suction step. If in the suction step, the piston moves from TDC to BDC, then in this step, the piston moves from BDC to TDC. Meanwhile, if the inlet valve is open on the intake stroke and the exhaust valve is closed, on this stroke the suction valve is closed and the exhaust valve is open.

The direction of the piston moving from BDC to TDC will push the remaining combustion in the combustion chamber out of the combustion chamber. This simultaneously provides free space again in the combustion chamber for further air from outside to re-enter the combustion chamber in the next process, namely the suction step.

Cycles 1-4 will occur continuously as long as the engine is running. Only when we turn off the diesel engine, the process mentioned above will stop. Therefore, if there is a problem with the machine, again understanding the working process of the machine will really help us find the problem.

Advantages of Diesel Engines (Diesel Engine Work)

How? the working process of a diesel engine is interesting, isn’t it? After knowing how a diesel engine works, maybe you are interested in buying a Toyota car with this engine. There are several advantages of a car with a diesel engine that can make you more confident. Here are some of the advantages of diesel engines over gasoline engines.

Diesel Engine Work

Fuel Efficient

If we launch from Cars Direct, the average diesel engine is more fuel efficient than gasoline-fueled vehicles. Diesel cars produce more power from less fuel. Why is that? That’s because diesel engines have a higher compression level than diesel engines, as I mentioned in the previous section. With the addition of a high-pressure fuel injection system, fuel economy is even better. With fuel economy, we will be able to save more money in the long term.

Fewer Maintenance Needs

Unlike gasoline engines, diesel engines tend to have fewer periodic maintenance requirements. Although still using an internal combustion engine, the way a diesel powerplant works is very different from a gasoline engine. The impact is to reduce maintenance and increase engine life.

Read more: Effects of Dirty EGR Valve on Common-Rail Diesel Engines

The main difference is that diesel engines use compressed hot air to ignite the fuel. This mechanism reduces the number of potential electrical failures and results in a reliable engine. The maintenance time span required is also longer. Even though we know that diesel fuel injection is currently using an electric system – common rail – but overall maintenance of diesel engines is still much simpler than gasoline engines.

Fire Hazard Relatively Small

In terms of safety, we can ensure that diesel engines will be safer than gasoline engines. This is because the possibility of the fuel igniting during an accident is lower with diesel fuel. Diesel fuel has a higher flash point than gasoline.

Not only talking about accidents, when repairing a car in a garage or at home (DIY), for example, there is no need to worry if, for example, a short circuit occurs in the car. Sparks will not be able to burn diesel fuel. That’s very different from a gasoline engine. Gasoline is flammable, even if there is a slight spark from an electrical short, the gasoline will simply catch fire.

Has Greater Torque

The most dominant last advantage is the problem of diesel engine torque. We can define simply that torque is the ability of the engine to move the vehicle from rest. The design of the diesel engine, in particular its slow fuel burning and high compression, generates more torque than any other engine. Torque is just as important as the ability to pull the load and accelerate. It is this extra torque that makes big trucks run on diesel engines.

Of the advantages mentioned above, it is clear that many will consider using a diesel engine. If bus and truck vehicle users ensure that their engines use diesel engines, then not a few private car users also choose diesel engines. Even though they don’t benefit from torque, many diesel car consumers take the positive side from fuel economy to simple maintenance of this type of car.

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