![]() ![]() ![]() At the BDC the exhaust valve will open, all the combustion particles will be thrown out of the cylinder with piston upward movement. Theoretical: In the theoretical Cycle, the expansion stroke has to start when the piston reaches the Bottom Dead Center (BDC) due to the power stroke. That is the way we can take the full advantage of the power stroke. So it has to start burning before the piston reaches to the TDC. But the reason behind injecting the fuel right before the piston reaches to the TDC is that the fuel complete combustion is not that instantaneous as like in the theoretical assumption. The ignition starts immediately right after the injection of the fuel into the cylinder. In which the piston is at the TDC.Īctual: In the actual Cycle, the fuel will be injected before the piston reaches to the top dead centre. Which is sufficient to self-ignite the fuel instantaneously which is injected at the end of the compression Stroke. Due to the high compression of the air in the cylinder, the pressure and temperature of the air are increased. Theoretical: In the theoretical Cycle, when the Piston reaches the Top Dead Center (TDC), Now the fuel is injected into the cylinder by the high-pressure fuel injector at the end of compression stroke. Because to close the valve completely, it will take some time. 360° of crankshaft rotation.Īctual: In the actual Cycle, The inlet valve starts closing right after the piston starts moving upward. These two strokes (i.e., suction and compression stroke) complete one revolution of the crankshaft. The Air in the cylinder will be compressed. At this BDC The Inlet Valve will close, and the piston will start to move upward. ![]() Theoretical: In the theoretical Cycle, on completion of the suction stroke, The compression stroke starts when the piston reaches the Bottom Dead Center (BDC). so it has to be started opening a bit early. Because in the actual engine the valve cannot be open instantaneous. Actual: In the actual Cycle, the inlet valve will be started opening just before the piston reaching to the Top Dead Center (TDC) from the previous cycle. ![]()
0 Comments
Leave a Reply. |