High-pressure common-rail fuel system for aero-engines

Abstract

The invention discloses a high-pressure common-rail fuel system for aero-engines. The high-pressure common-rail fuel system comprises a fuel metering unit, a high-pressure fuel pump, a fuel rail and arail pressure control valve which is arranged on the fuel rail and used for controlling the fuel return amount of the fuel rail. According to the high-pressure common-rail fuel system for the aero-engines, the rail pressure control valve is arranged, and the fuel rail pressure is controlled and adjusted directly through control on the fuel return amount of the fuel rail, so that the reliability,the safety and the maneuverability of the fuel system are improved, the response speed of the system is substantially increased, and the performance of the engines is improved.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, in particular, the invention relates to a high-pressure common rail fuel system for aero-engines. Background technique [0002] For the engine, the fuel system is an important component system. Its main function is to provide a certain quality of fuel for combustion at regular intervals and quantitatively. The fuel combustion converts chemical energy into heat energy to do work on the piston. The piston drives the crankshaft to rotate through the connecting rod. output mechanical energy. [0003] At present, the fuel system of diesel piston engines mostly adopts the form of high-pressure common rail, which is mainly composed of fuel metering unit, high-pressure fuel pump, fuel pipe, high-pressure fuel rail, fuel injector, fuel pressure sensor, fuel temperature sensor, rail pressure sensor, etc. [0004] The fuel system in the form of high-pressure common rail can improve the atomization eff...

AI Technical Summary

Problems solved by technology

In order to avoid this phenomenon, only a small amount of fuel is compressed by the high-pressure oil pump and then enters the fuel rail when starting, resulting in a long time for fuel rail pressure to build up when starting

Similarly, when an aero-engine overruns (generally speaking, the ECU data has been solidified, and the fuel injection pulse width is a definite value under the current working conditions, so the rail pressure exceeds the rated value and causes overrunning), the fuel rail pressure cannot be controlled in time to affect the engine. The performance is adjusted (the fuel has entered the fuel rail and cannot be discharged), and the current method of cutting off fuel is mostly used, and the response is slow (the fuel entering the fuel rail can only be consumed by the fuel injector to reduce the rail pressure)

At the same time, the normal operation of the entire fuel system depends on the matching relationship between the fuel metering unit and the fuel supply capacity of the fuel pump. Due to the mechanical failure of the high-pressure pump, there is a deviation between the actual fuel supply and the theoretical fuel supply (at this time, the duty cycle of the fuel metering unit deviates from the target rail pressure and the engine performance map), and the performance of the entire engine will be seriously affected. influences

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