After the diesel fuel of the diesel generator set is injected into the cylinder, it is mixed with the air to form a combustible mixture. In order to ensure that the combustible mixture is fully burned, and the combustion pressure reaches a large value at a certain moment after the top dead center, to ensure the diesel generator set diesel engine works normally.
When the piston reaches a certain angle before the compression top dead center, the fuel injection pump must supply fuel to the fuel injector. The fuel supply time is expressed by the crankshaft rotation angle, which is called the fuel supply advance angle. The fuel supply advance angle is an important factor that affects the combustion process of the diesel engine. A good fuel supply advance angle makes the power and economy of the diesel generator set better.
In the process of use, due to the wear of the relevant parts or the change of the relative position, the fuel supply advance angle will change. When it exceeds a certain range, the performance of the diesel engine of the diesel generator set will deteriorate and work abnormally.
If the fuel supply advance angle is too large (the time is too early), due to the low pressure and temperature of the compressed air in the cylinder, the injected diesel cannot spontaneously ignite and accumulate quickly. If the rise is too strong, the diesel engine of the diesel generator set will work rough, knock the cylinder, easily damage the parts, reduce the power, and even easily reverse and catch fire when starting.
If the fuel supply advance angle is too small (the time is too late), the combustion process will be prolonged, the heat loss will be large, and the combustion will be incomplete, resulting in overheating of the diesel engine of the diesel generator set, power reduction, and black smoke. For example, the fuel supply time of the S195 diesel engine is later than At the specified time of 10, the power dropped by 0.29 kw, the fuel consumption increased by 0.054g/kw·h, and it was difficult to start.
If the fuel supply time is particularly late, it is basically impossible to start. Therefore, correct inspection and adjustment of the fuel supply advance angle of the diesel generator set diesel engine is an important technical work that the maintenance personnel should master. In order to ensure that the diesel engine has good economy, power and starting performance, it is necessary to ensure that the fuel supply advance angle is within the specified range. The fuel supply advance angle must be adjusted when the diesel engine of the diesel generator set works for about 500 hours, and the fuel injection pump that has been dismantled and repaired should also be adjusted.
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