![]() ![]() ![]() ![]() The "rail pressure", or pressure of the fuel system at the outlet of the high pressure pump, can reach pressures in excess of 30,000 psi. The high pressure pump maintains tremendous pressure within the common rail(s) an I-6 engine features a single common rail that feeds each injector, while a "V" engine will utilize two common rails, one for each engine bank. The lift pump's only purpose is to consistently provide fuel to the injection pump - the pressure of the fuel as it enters the injection pump is small and has no effect on the actual injection pressure. A common rail system is comprised of a low pressure fuel pump (lift pump), high pressure fuel pump (injection pump), Piezo electric fuel injectors, and the associated rail system.įuel is delivered from the fuel tank to the injection pump via the lift pump. The configurations superior performance characteristics and relatively high injection pressures reduce emissions while improving efficiency. High pressure common rail injection systems, or simply common rails, are the injection type of choice for modern diesel engines. ![]() Due to relatively high injection pressures and greater control over injector events, common rail injection systems feature favorable performance characteristics and lower emissions. The high pressure common rail is the injection type of choice for modern diesel engines, far surpassing the capabilities of mechanical and hydraulic injection systems of years past. The original article can be found here - if you’d like to read the article there, or I’ve pasted parts of it here to share it. Today I found a great article in Diesel Hub that I know many of you will enjoy reading or possibly relate to. The thermal expansion compensator of the spreader body of the injector and the piezo ceramic, which operates on a hydraulic principle, is mounted above the piezo actuator, thus providing fuel flow.Hi everyone. The sand activator directly pushes the needle of the injector, so that very precise injection is achieved without stopping. The injector consists of three parts, the injector servo valve, the piezo actuator and the compensation element, which are arranged in a row one after the other. In a piezo injector, a multi-layer ceramic element is used as a so-called piezo pole of interconnected elements. in case they are exposed to electrical voltage, they have mechanical displacement. To increase precision, the operating pressure is increased to 2000 bar, and the mechanism that drives them is based on a piezo system that provides high speed and accuracy. The role of injectors is to inject a certain amount of fuel very precisely into the chamber. The CRDI system operates at high pressures with flexible fuel delivery control.īecause the injection is fully electronically controlled, multiple injections can be made and high injection pressures can reduce exhaust emissions and fuel consumption, with excellent driving performance and low noise. The main advantage of CRDI systems over traditional fuel injection systems is that high injection pressures are always available and the fuel injection time is independent of the crankshaft angle position. Therefore, precise injector control is one of the most important parts of CRDI engine control. The operational performance of injectors in CRDI diesel engines have an impact on exhaust emissions. In CRDI diesel engines, piezo injectors have gradually replaced electromagnetic injectors, due to the speed of reaction of the injectors. ![]()
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