How should we choose the fuel injector and which one do you use? Let’s learn about it together.
The difference between the injector of the direct-injection engine in the cylinder and the ordinary injector： EFI and direct injection is not a side-by-side relationship. Electronic fuel injection is a computer-controlled fuel injection, which is more precise and smarter than that of the carburetor. The carburetor is mechanical, relatively primitive, and is basically no longer used.
Direct injection corresponds to ordinary injection. Direct injection refers to the direct injection of fuel into the cylinder. It requires high injection pressure, high injection accuracy, and large technical content. The advantages of direct injection are less fuel waste, fuel economy, complete combustion, and clean emissions. When the normal injection is used, the foot is sprayed into the intake port, and now most low-end cars are ordinary injection. The fuel injection nozzle is used for direct injection in the automobile cylinder. Direct injection in the cylinder is indeed a good technology, but it is a pity that domestic oil quality has an impact on this technology and it is difficult to achieve popularization.
What is the difference between the detection of the injector of the direct-injection engine in the cylinder and the ordinary injector The fuel injector is an important actuating element and also the most prone to malfunction. If the injector fails, it will not only affect the engine’s forward rotation, but also cause a decline in power and economy, and even cause the engine to stop.
When we usually check the electronically controlled gasoline injection system of the intake port structure, we usually use a light-emitting diode test light to check the unplugged fuel injection head, turn on the ignition switch or start the engine. If the light is on, there is no problem. Can direct injection engines also use this method to detect fuel injectors?
The following is the example of the high-pressure direct injection engine currently used by Volkswagen. Its fuel injectors use 6-hole fuel injectors, and the internal structure is similar to traditional injection (Figure 1).
The motive control unit controls the fuel injector voltage to 65V. There is a DC / DC transformer inside the control unit to convert 12V to 65V. When the injector is turned on, it needs 12A of current. When the needle valve is opened and 65V electricity is applied, the needle valve continues to open and only a small 12V voltage is loaded. The end of the fuel injector is long and thin to improve the cooling effect. The fuel injector has a clamping clip that needs to be replaced as long as it is disassembled. If these are not taken into account, the test lamp can withstand high voltage, and it is feasible to detect it according to the method of port injection.
In this article, we introduced the difference between the direct injection injector in the cylinder and the ordinary injector. Do you want to know more?