Sinotruk XCMG accessories hangfa fuel injectorVG1038080007
Applicable models XCMG QY25K5C_2 QY70KC QY50KC QY25K5D_2 QY25KC XCT35_BR QY25K5D_3 QY25K5D_3 QY25K5C_1 QY55KC_1 QY25K5F_1 QY50KC QY50K5C_1 QY25K5C_2 QY25K5F qy25k5c qy25k5d_2 qy30kc qy55k5c_2 qy25k5f_1 qy25k5d_1 qy30kc qy55k5d
XCT80L6 XCT130_1 XCT12 XCT80L6 XCT25L4_S XCA40_M XCA30_JY XCT25L5_3 XCT55L5 XCT110_1 XCT60L6 XCT12 XCT25L5_SR XCT25L5_2 XCT95L7 XCT75L7 QY110K8C QY95K7C QY110K7C XCT100 XCT75_S QY40KC XCT90 XCT25 XCT25L5_E QY70KC QY40K5C_2 XCT60L6_1 QY75KC QY100K7C QY95KH QY100K6C QY50JW XCT16_1 XCT100_BR XCT60 QY20K5D QY85KC XCT25 XCT80L5 XCT100 XCT20L5_1 XCT75L6 XCT20L5 XCT80_S XPD36 QY16KC QY16KC QY40K5D_1 QY25K5L XCA40 QY40KD QY80K5D QY70K5D_1 QY50KD QY20K5C XCT50_Y XCT16_Y XCT25L4_Y XCT80_Y XCT60_Y XCT50_Y and other XCT QY RT series models
Product introduction:
The diesel fuel injection system atomizes the fuel and distributes it among the components that mix with the air in the combustion chamber.
It is mainly composed of a fuel injector and an injector body. The fuel injectors installed on the cylinder head are divided into two types: open type and closed type. The open injector has a simple structure but poor atomization and is rarely used. Closed fuel injectors are widely used in various diesel engines. The diesel engine inhales pure air during the intake stroke. When the compression stroke is nearing the end, the diesel oil is increased to more than 100MPa by the fuel injection pump, injected into the cylinder through the fuel injector, and mixed with the compressed high-temperature air in a very short time to form a combustible mixture. Due to the high compression ratio of diesel engines (usually 16-22), the air pressure in the cylinder can reach 3.5-4.5MPa at the end of compression, and the temperature is as high as 750-1000K (while the gas mixture pressure of gasoline engines at this time will be 0.6-1.2MPa , the temperature reaches 600-700K), which greatly exceeds the self-ignition temperature of diesel. Therefore, after the diesel fuel is injected into the cylinder, it immediately ignites and burns by itself after being mixed with the air in a very short time. The air pressure in the cylinder rises rapidly to 6-9MPa, and the temperature also rises to 2000-2500K. Driven by the high-pressure gas, the piston moves downward and drives the crankshaft to rotate to perform work, and the exhaust gas is also discharged into the atmosphere through the exhaust pipe.
The ordinary diesel engine is driven by the engine camshaft, and the diesel oil is delivered to the fuel chamber of each cylinder by means of a high-pressure oil pump. This oil supply method should change with the change of the engine speed, and the optimal oil supply amount at various speeds cannot be achieved. The common rail injection fuel supply system consists of high pressure fuel pump, common fuel supply pipe, fuel injector, electronic control unit (ECU) and some pipeline pressure sensors. Each fuel injector in the system is connected to the common fuel supply through its own high pressure fuel pipe. The pipes are connected, and the common fuel supply pipe acts as a hydraulic pressure accumulator for the injector. When working, the high-pressure fuel pump delivers fuel to the public fuel supply pipe at high pressure, and the high-pressure fuel pump, pressure sensor and ECU form a closed-loop operation to precisely control the oil pressure in the public fuel supply pipe, completely changing the oil supply pressure with the engine speed change. Phenomenon. Its main features are as follows:
1. The fuel injection timing is completely separated from the fuel metering, and the fuel injection pressure and the fuel injection process are controlled by the ECU in time.
2. The fuel injection pressure of each cylinder, the starting point and duration of fuel injection can be adjusted according to the working conditions of the engine, so as to pursue the best control point of fuel injection.
3. High fuel injection pressure and pre-injection of diesel can be achieved.
