How to choose a common rail tester?
There are many manufacturers of common rail tester on Chinese market. Each of them promotes the quality of their common rail tester. The price of the common rail tester ranges from tens of thousands to hundreds of thousands.
Today, I will briefly explain here how to choose a suitable common rail test bench.
The main factors affecting the test accuracy of the common rail test bench include hardware and software:
Hardware: common rail, fuel pump, fuel temperature control system
The common rail is the pressure accumulator, and the fuel pump is the source of power.
The stability of pressure and fuel temperature will directly affect the repeatability and stability of the test data.
That is to say, the performance of the rail and the common rail pump will directly affect the accuracy of the data.
But in order to confuse customers, some manufacturers will work hard on the software to keep the pressure data displayed on the test bench in a stable state, to cheat customers. At this time, you can take a mechanical pressure gauge to test whether the actual pressure and the displayed pressure on the test bench are consistent.
Or you can take a single test on the test bench with a fuel injector, single-step test and continuous test to check the repeatability and stability of the data.
This is the key hardware needs attention. In the next chapter, we will introduce the software and other content.
Regarding the rail of the common rail tester, some manufacturers use the original Bosch rail, means rail and DRV are together( complete), but more manufacturers in order to save costs, fight with others by cutting prices , they use the common rail from Chinese market, some are dismounted from engine, and clean the appearance, and DRV (DRV also has different places to produce ), with an adaptor in the middle (I personally refer to call this as “rail combination”), such a combination of rails will be much cheaper than the original rail, but according to the test experience of the test bench manufacturers, this The rail combination can also be used to meet the test requirements. After all, most of the customers need to buy a cheaper common rail tester, but I am not a professional technician. I don’t know how much is the difference of the influence in the performance of the test bench by using the this two types rails on the common rail test bench,
Regarding the fuel pump, the pump of CP3 is generally equipped on the common rail test bench, and the pump of the CP1 is equipped on the fuel injector tester, but the new original pump on the test bench which are bought by foreign customers , because for foreign customers, it is not easy to do the after-sales service, in order to avoid future problems, usually use new genuine fuel pump, for China domestic customers, they prefer the cheap common rail test bench, and easy for after-sales service, so it is usually equipped with second-hand pump, that is, removed from the engine, but the performance is still intact.
In addition to these key factors, the quality of other hardware on the common rail tester needs to be noted. For example, inverters, the good brand is such as LG or Siemens. Lower level is that made in Taiwan or China mainland, the cost is a little cheaper, like therail combination I talked about above, it can meet the test basic needs, but who know after 5-10 years?
There are other factors. I will continue to talk later, hoping to help customers choose the common rail test bench that they are satisfied with.