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The Four Stroke Diesel Operating Principle of Silent Diesel Generator

Feb. 16, 2023

Today, we will briefly introduce the four-stroke diesel working principle analysis of the silent diesel generator.


Quiet diesel generator intake stroke: during the intake stroke, the piston moves from top dead center to bottom dead center driven by the crankshaft. At this time, the intake valve opens and the exhaust valve closes. As the volume in the cylinder increases, the pressure in the cylinder is lower than the atmospheric pressure, so fresh air enters the cylinder through the suction valve. Due to the resistance of the intake system, the pressure of the air entering the cylinder is lower than the atmospheric pressure. At the end of intake, the pressure in the cylinder is about 0.8~0.9 atmospheric pressure, and the temperature is 40~70 ℃. At the end of this process, the more fuel can be injected into the cylinder at best, the more energy will be released during the combustion process, and the more power the diesel engine will emit


silent generator


Silent diesel generator compression stroke: the piston moves from the bottom dead center to the top dead center, and the inlet and exhaust valves are closed. The piston compresses the air sucked in the stroke in the combustion chamber, which increases the temperature and pressure of the air. At the end of this process, the air temperature in the cylinder is about 500~700 ℃ and the pressure is 27~49 atmospheric pressure


Power stroke of soundproof generator: the piston moves from top dead center to bottom dead center, and the inlet and exhaust valves are closed. At the end of the compression process, the fuel injector injects high-pressure fuel into the cylinder and mixes it with high-temperature and high-pressure air. Because the temperature is higher than the diesel self-ignition point, a large amount of heat energy is generated, which causes the temperature and pressure in the cylinder to rise sharply. The high-temperature and high-pressure gas pushes the piston down, drives the crankshaft to rotate through the connecting rod, and works externally. The combustion pressure in this process is about 60~90 atmospheres, and the temperature reaches 1700~2000 ℃. With the expansion, heat energy is converted into mechanical energy, and the pressure and temperature of the gas in the cylinder drop sharply. At the end of expansion, the pressure in the cylinder drops to 4 atmospheres, and the temperature drops to 600~900 ℃.


Super quiet generator exhaust stroke: the exhaust stroke piston moves from the bottom dead center to the top dead center. At this time, the inlet valve closes and the exhaust valve opens. After expansion, the gas in the cylinder has lost the ability to do work, which is called exhaust gas. In order to allow fresh air to re-enter the cylinder, exhaust gas needs to be discharged. The exhaust gas is pushed up by the piston and flows through the exhaust valve to the outside of the cylinder. At the end of the schedule, the pressure in the cylinder is about 1.03~1.08 atmospheres, and the temperature is about 350~600 ℃.


At this point, the piston returns to the top dead center, the single-cylinder four-stroke diesel engine completes a working cycle, and the crankshaft rotates for two cycles. In addition, in fact, the action time of the intake and exhaust valves of the diesel engine is not that the piston moves to the top and bottom dead center, but that the intake valve opens before the top dead center and closes after the bottom dead center; The exhaust valve opens before the bottom dead center and closes after the top dead center.


It can be seen from the four working processes of the four-stroke diesel engine that only the work is done, and the other three strokes are auxiliary processes, which need to consume energy. The energy consumed by a single-cylinder diesel engine is provided by the energy stored by the flywheel, while the multi-cylinder diesel engine is provided by the power stroke of other cylinders. If you would like to get more information welcome to contact us via sales@dieselgeneratortech.com.

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