1, the impact of needle lift:
As shown in the figure below: The blue curve shows the injection curve when the needle valve lift of the injector is 250 μm. When the needle lift is 280 μm, the injection curve will be in the state shown by the red curve.commonrailparts When the needle lift is adjusted to 230 microns, the injection curve of the same injector will be as shown by the green curve. As can be seen from the figure, when adjusting the lift of the needle valve, only the amount of oil at the full load point is affected.
2, the impact of the oil spring force:
As shown in the figure below: The blue curve indicates the injection curve when the injector spring force of the injector is 34N. When the nozzle spring force is 31N, the injection curve will be in the state shown by the red curve. When the oil spring force is adjusted to 37N, the injection curve of the same injector will be as shown in the green curve. It can be seen from the figure that when adjusting the force of the oil spring force, it mainly affects B16 the oil quantity at the low idle point, and the influence on the oil quantity of other injection points is very limited.
- The influence of the spring force of the solenoid valve:
As shown in the figure below: The blue curve shows the injection curve when the valve spring force of the injector is 67N. When the valve spring force is 63N, the injection curve will be in the state shown by the red curve. When the valve spring force is adjusted to 71 N, the injection curve of the same injector will become as shown by the green curve. As can be seen from the figure,B14 when adjusting the spring force of the valve, it will affect the fuel injection amount of the entire injection area, and the influence on the fuel injection amount of the discharge point is the largest. - The impact of the armature lift:
As shown in the figure below: The blue curve shows the injection curve when the injector’s armature lift is 50 microns. When the armature lift is 60 microns, the injection curve will be in the red curve. When the armature lift is adjusted to 40 microns, the injection curve of the same injector will become as shown by the green curve. It can be seen from the figure that when the armature lift is changed within a certain range (CRIN2: 30~70 microns), only the amount of oil in the pre-spray point is affected.
During the maintenance process, some masters can find that the oil volume of each injection point will have a significant effect by adjusting the thickness of the large size of the armature. This is only because the armature lift is not in the normal range (oversized or ultra-small, for CRIN2). It is not in the 30~70 micron range. At this time,B25 the injector is not working properly. The situation is as shown in the figure below, and the dynamic working performance is disordered. It can be seen that controlling the size of the armature lift during the maintenance process is crucial. - The summary of CRIN
If you need to replace the valve assembly during the repair process, please use the precision measuring gage to control. If there is no complete precision measuring gage, at least one armature lift must be controlled to make it within a reasonable range (30~70 microns).B22 The corresponding gasket is then adjusted by the bench test results.