Introduction
The diesel power plant usually operates at a constant speed, and the output power is determined by the fuel injection process control. The injection control process (which has a decisive influence on the output power), needs to have a high-precision control of the fuel injection parameters, adjusting the fuel supply through the fuel valve during the process. It is one of the important components of the diesel engine, its failure will directly lead to the output power of the diesel engine significantly reduced. Therefore, it is very important to carry out fault diagnosis for fuel valve in order to ensure the normal operation of diesel engine.
Fault Diagnosis for Diesel Engine Fuel Valve
1. Measurement of valve opening
The opening measurement of fuel valve is the first step for fault detection of fuel valve in diesel engine. According to the design requirements of the valve, the opening size and the lift can be measured according to the pressure differences of different ports.
2. Measurement of Initial Pressure
When measuring the fuel valve opening, the pressure at the valves inlet port should be measured. If the pressure difference between the two sides of the valve is very small, there may be a certain fault of the fuel valve. In this case, it needs to further measure the fuel pressure at the inlet of the valve and calculate its pressure difference between the inlet and outlet.
3. Pressure measurement of valve outlet
It is necessary to measure the pressure difference between the outlet side of the valve and the inlet side, which can be used to determine the tightness of the valve. If the pressure difference is greater than the specified value, it can be considered that the valve has leaked.
4. The Measurement of Valve Noise
The performance of the fuel valve will deteriorate over time due to long-term work and aging. Its components must be abraded, making the valve fail to open and close smoothly, and the seal and sealing performance is also poor. In order to detect this kind of fault, it is necessary to measure the clicking sound of the valve, inspect the valve body and other parts, and then confirm the fault.
5. Measurement of Valve Distortion
The distortion measurement of fuel valve can determine whether the valve is deformed. When testing, the gap between the valve and the valve seat needs to be measured. If the gap is larger than the specified value, the valve must be re-formed or replaced.
Conclusion
The fault diagnosis for diesel engine fuel valve is necessary for ensuring the normal operation of diesel engine. After the fuel valve fault is found, timely processing measures should be implemented to ensure the normal operation of diesel engine. The main measures for diagnosing fuel valve faults in diesel engines include opening measurement, initial pressure measurement, outlet pressure measurement, noise measurement and valve distortion measurement. With these methods, it is possible to fault diagnose for diesel engine fuel valve.
柴油机气门故障诊断
介绍
柴油机通常在恒定转速下工作，输出功率由燃油注射过程控制决定。注射控制过程（对输出功率有决定性影响），需要对燃油注射参数有高精度的控制，在此过程中通过燃油阀调整燃油供给。它是柴油机的重要组成部分之一，其故障将直接导致柴油机输出功率大幅降低。因此，为了确保柴油机的正常运转，对燃油阀进行故障诊断是非常重要的。
柴油机燃油阀故障诊断
1.阀门开度测量
燃油阀开度测量是柴油机燃油阀故障检测的第一步。根据阀门的设计要求，可以根据不同端口的压力差来测量开度大小和行程。
2.初始压力测量
测量燃油阀的开度时，需要测量阀门入口处的压力。如果阀门两端的压力差非常小，可能存在一定的燃油阀故障。在这种情况下，需要进一步测量阀门的入口燃油压力，计算入口与出口之间的压力差。
3.阀门出口压力测量
有必要测量阀门出口端与入口端之间的压力差，以此来确定阀门的密封性。如果压力差大于规定的值，则可以认为阀门有漏油现象。
4.阀门噪声测量
由于长期工作和老化，燃油阀的性能会逐渐下降。其零件必然磨损，使阀门无法平稳开关，密封和密封性能也很差。为了检测这种故障，必须测量阀门的点响，检查阀体等部件，然后确定故障。
5. 阀门变形测量
燃油阀的变形测量可确定阀门是否变形。测试时，需要测量阀门和阀座之间的间隙。如果间隙大于规定值，则必须重新整形或更换阀门。
结论
柴油机燃油阀的故障诊断是确保柴油机正常运行的必要步骤。发现燃油阀的故障之后，应该及时采取处理措施，以确保柴油机的正常运行。柴油机燃油阀故障诊断的主要措施包括开度测量
