Figure 4.6 KomponenEngine Shaping Space Fuel
Cycle Engine Diesel Four Steps
The working process of the motor fuel cycle four steps can be described as follows:
1. Step Suction
In this step the piston moves from top dead point to the point dies down. Suction valve open so due to vacuum the case of expansion of the volume in the combustion chamber, the air from the outside can get into the combustion chamber through the suction valve open. In combustion engine equipped with a turbocharger the air entering the combustion chamber will be more due to the encouragement of the press compressor wheel padaturbocharger.
2. Step Compression
After the piston reaches bottom dead point, the direction of the piston will turned toward the back to the top dead point, it’s just that in step no valves are open. As a result of shrinking the volume of the combustion chamber, the air that is in combustion chamber becomes compressed. With a compression ratio ranging from 19: 1 to 23: 1, the air pengkompresian in the combustion chamber will produce compression heat (heat compression) is high (approximately about 1,000 oF).
A few degrees before the piston reaches top dead point material The diesel fuel-injected through nozle into the combustion chamber, of the injection should use a high pressure so that diesel fuel is sprayed into the combustion chamber changed into granules and solar fluid very smooth like a fog. At the time of the diesel spray mixture of diesel and the air in the combustion chamber began to burn from the heat affected heat generated by compression.
3. Step Power
The process of burning a mixture of diesel fuel and air continues until the piston reaches top dead point and then back change direction back toward the bottom dead point. Some degree (+ 10o) after passing through the point of death on the arson has been perfect so that the resulting explosion pressure forcing the expansion piston to continue moving towards the point of death below.
4. Step Disposal
After the blast of heat energy in the power step has been transformed into mechanical energy, the rest of the combustion process that there should be discarded. This process occurs when the piston moves from the bottom dead point to the top dead point to the condition of the exhaust valve opens. Waste products of combustion gases driven off by the piston through the exhaust valve.
Furthermore, through mufler the gas will be released into the atmosphere. Except for diesel combustion engine equipped with a turbocharger then before entering into the gas mufler still be used to rotate sudu- turbine blades on the turbine wheel.
Similarly, this cycle occurs continuously on diesel motor fuel. Illustration of a diesel four-step process work can be seen in the image below. Image sequence from left to right show the condition: the end of the suction step, the end of the compression stroke, the initial step initial step power and exhaust.
