What are the disadvantages of Komatsu's traditional fuel injection system?

The traditional fuel injection system uses the plunger to compress low-pressure fuel into high-pressure fuel, which is delivered to the injectors of each cylinder through the high-pressure fuel pipe. When the crankshaft rotates to the corresponding injection point, the fuel pressure reaches the highest, and the needle valve in the injector is pushed open to inject high-pressure fuel into the cylinder. Due to its structural limitations, it is easy to cause the following shortcomings:

1, the injection pressure increases with the increase of engine speed, and the relative pressure is low at low speed, so the atomization is not good.

2. Under normal circumstances, the startup, acceleration and oil quantity adjustment are all controlled by mechanical governor, so the control accuracy is not high. The proportional fuel quantity deviates from the theoretical fuel quantity required for actual working conditions, which leads to incomplete combustion and increases emission pollution.

3. Its structure limits the further increase of fuel pressure. When atomizing, the fuel particles are large, the mixing area with air is insufficient, and the combustion is incomplete, which also affects the emission.