PT yakıt sistem bu bir sembol o Kimyon motorları diğer dizel motorlardan ayırır. Onun ayırt edici harf PT için basınç ve zaman, while P başvurur için yakıt basınç at ile giriş ile enjektör. T yönlendirir ile etkili zaman için yakıt için akış için yakıt enjektör içine güvenli zaman için içine yakıt enjektör bardağa.
1, özellikleri of PT yakıt sistem vardır (1) enjeksiyon basınç aralık of yukarı 10000-20000PSI (PSI is pound başı kare inç, yaklaşık 6.89476kPa), hangi sağlayabilir sağlayabilir iyi yakıt atomizasyon. maksimum yakıt basınç çıkış by PT yakıt pompa olur değil aşılır PSI. (2) Tümü yakıt enjektörler hisse a yakıt besleme boru, yani eşit eğer bazı hava girer the fuel system, o olur olmaz neden onun motor to stop. (3) PT yağ pompa yapar gerektirmez zamanlama ayarlama, the oil volume is kontrollü by the oil pump and nozzle, ve the engine power olabilir bakımlı stabil olmadan güç kayıp. (4) Yaklaşık % nın içinde yakıt kullanılır soğutmak ile enjektörler önce dönüş için yakıt tanka, ve enjektörler ve enjektörler ve ile iyi soğutulmuş. (5) İyi evrensellik, ile bazı ayarlamalar yapılan ile aynı temel pompa ve enjektör, o olabilir uygulanabilir ile için güç ve hız değişiklikler of farklı motor modeller aşı bir geniş aralık.
Temel bileşenler PT yakıt sistem oluşur yakıt tankı% 2c yakıt filtre% 2c PT yakıt pompa% 2c düşük basınç yakıt teslimat boru, enjektör , külbütör kol% 2c itme çubuk% 2c enjeksiyon kam ve dönüş boru. arasında onlar% 2c PT yakıt pompa içerir dişli pompa , manyetik filtre , darbe diyafram damper , iki kutup vali% 2c gaz kelebeği şaft, ve solenoid valf. Yakıt sistem diyagram nın motor is gösterilen içinde Şekil 1, ve bu yakıt akış diyagram is gösterilen içinde Şekil 2.
Şekil 1 Motor Yakıt Sistem Şema
Şekil 2 Şematik diyagram nın motor yakıt akışı
The fuel pump draws fuel from the fuel tank, passes it through the filter and governor, and sends it to the fuel injectors. According to the design of the PT system, about 80% of the fuel supplied by the PT pump to the fuel injectors will return to the fuel tank through the injectors during operation, mainly for cooling and lubricating the fuel injectors. It also has the function of preventing fuel freezing during cold weather and bringing back air from the PT system to the fuel tank for discharge.
2, Common troubleshooting of PT fuel system. (1) When the engine has difficulty starting or cannot be started, the power is insufficient, or it cannot be stopped or turned off, it is generally judged as a malfunction of the parking valve. Firstly, use the manual shaft to open and close the parking valve. Screw the manual shaft in until it can no longer be turned, which is called opening. When parking, unscrew the manual shaft until it can no longer be turned. Next, disassemble the parking valve, clean the parts of the parking valve, and grind the inner hole of the valve body with sandpaper. (2) When the engine is running at an unstable speed, first remove the EFC electronic actuator. Loosen the mounting screws, then rotate the EFC actuator 15 degree , remove and clean the actuator, and then reinstall the fuel pump body according to the following method: insert the actuator into the fuel pump body until the actuator flange is about 9.5mm away from the fuel pump body, then gently push the actuator into the fuel pump EFC mounting hole with your palm and rotate it 30 degree until the actuator flange touches the fuel pump body. Tighten the installation screw clockwise from the bottom, first tighten by hand until it can no longer be turned, and then tighten with a wrench. Additionally, check if the shock absorber diaphragm is depressed or if there are any hidden cracks. First remove the shock absorber, then disassemble the shock absorber and check if the shock absorber diaphragm is recessed or if it falls onto a hard surface with a crisp sound. If the sound is muffled, the shock absorber diaphragm needs to be replaced. (3) When the engine with AFC accelerates and there is excessive smoke or insufficient power, the airless adjustment screw can be adjusted (only applicable to single spring AFC when the airless adjustment screw is on the fuel pump body); If the smoke is high, screw it into the pump body; Insufficient power, twist outward. Attention: Twisting in and out is limited to within half a turn. (4) If the engine power is insufficient for the full range pump and generator pump, the throttle shaft throttle can be appropriately increased, that is, the front limit screw can be retracted. If the fuel pump or throttle shaft is not locked at full throttle, the throttle cannot be changed. (5) When adjusting the idle speed of the fuel pump, the idle speed of the fuel pump can be adjusted because the idle speed adjusted on the test bench is the same value, but the adapted host varies greatly. The idle speed of the two pole speed controller is adjusted inside the two pole spring group housing, and the idle speed adjustment screw of the VS speed controller is used for idle speed adjustment. (6) Replace the filter element in the front filter of the parking valve. Note that when installing the filter element, the small hole should face inward and the large end of the spring should be outward. (7) Replace the O-ring and spring of the fuel injector. When replacing, ensure that no dirt enters the fuel injector cavity. After replacing the spring, reinstall the fuel injector plunger, ensuring that it is clean and free of dirt, and that it rotates smoothly without obstruction. In addition, the PT fuel system has high requirements for fuel cleanliness, and most faults are mainly caused by poor fuel cleanliness and excessive impurities, resulting in damage to the fuel pump. Therefore, selecting high-quality and high cleanliness fuel, using genuine filter cartridges, and proper maintenance are the prerequisites for the normal operation of the PT system.
