Self-adaptive adjustment method and system for initial oil supply amount of ground starting of engine

Abstract

The invention belongs to the technical field of aero-engine starting control, and particularly relates to a self-adaptive adjusting method and system for the initial fuel supply amount of engine ground starting. The method comprises the following steps: S1, acquiring a slight anomaly statistical value pre-stored in an airborne system; s2, according to a given initial oil supply amount adjustment step length and a slight anomaly statistical value, determining a down-regulation amount compared with original ground starting oil supply; step S3, determining the down-regulated ground starting oil supply amount; s4, ground starting oil supply is conducted on the engine on the basis of the reduced ground starting oil supply amount; s5, the ratio of the engine exhaust temperature variable quantity to the engine high-pressure rotating speed variable quantity in the ground starting process of the engine is obtained; and S6, determining whether the ground starting of the engine is abnormal or not according to the ratio and a given slight abnormality criterion threshold value, if so, adding 1 to the slight abnormality statistical value, and storing the slight abnormality statistical value in an airborne system. According to the invention, the adjustment workload of ground maintenance personnel is reduced.

Description

technical field [0001] The application belongs to the technical field of aero-engine start-up control, and in particular relates to a method and system for self-adaptive adjustment of the initial fuel supply amount for engine ground start. Background technique [0002] When starting on the ground, the initial fuel supply (ie ignition fuel supply) of the aero-engine directly affects the ignition reliability of the engine and the working stability of the compressor. Too much initial fuel supply will lead to unsuccessful ignition of the rich fuel in the combustion chamber or stall of the compressor, resulting in failure to start the engine; too little initial fuel supply will cause the combustion chamber to fail to ignite or stall at the lean point, and the engine will hang cold. Startup failed. Whether the initial fuel supply of an aero-engine is appropriate is affected by many factors such as the accuracy of the fuel supply of accessories, the stable working margin of the co...

AI Technical Summary

Problems solved by technology

Too much initial fuel supply will lead to unsuccessful ignition of the rich fuel in the combustion chamber or stall of the compressor, resulting in failure to start the engine; too little initial fuel supply will lead to misfire or flameout at the fuel-lean point of the combustion chamber, and engine cold suspension failed to start

Whether the initial fuel supply of an aero-engine is appropriate is affected by many factors such as the fuel supply accuracy of accessories, the stable working margin of the compressor, the hot and cold state of the engine, and the operating environment. It is difficult to accurately give the initial fuel supply suitable for all engines. oil volume

Therefore, in order to ensure the fuel supply accuracy of different accessories and the starting reliability of the engine under different operating environments, it is necessary to manually adjust the engine adaptively, which will not only increase the workload of the ground maintenance personnel (download data, interpretation, adjustment rules and ground driving verification) etc.), it will also lead to the further deterioration of the "slight abnormality" caused by the inappropriate initial fuel supply, which will affect the engine's starting success rate and user attendance rate

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