A control method of acceleration process with self-braking function

Abstract

This application belongs to the field of aircraft engine design and relates to an acceleration process control method with a self-braking function. The method includes: obtaining a given high-pressure rotor speed and a measured high-pressure rotor speed under actual working conditions, and calculating the difference between the two Value Δn2, obtain the given low-pressure rotor speed and the measured low-pressure rotor speed under actual working conditions, and calculate the difference Δn1 between the two; if the difference Δn2 is greater than the first threshold value set, and the engine is at idle or above , then enter the acceleration control strategy; if the difference Δn2 is less than the set second threshold value, or the difference Δn1 is less than the set third threshold value, or the difference between the given value and the measured value of the exhaust gas temperature after the low-pressure turbine If it is less than the set fourth threshold, enter the pre-exit control strategy. The present application guarantees the engine transition state performance under the premise that the acceleration meets the index requirements by delaying the timing of the given oil release from the acceleration line in the acceleration control strategy and by using the pre-exit strategy to ensure that the acceleration meets the index requirements.

Description

technical field [0001] The application belongs to the field of aircraft engine design, in particular to an acceleration process control method with a self-braking function. Background technique [0002] The acceleration of the engine is an important indicator of whether the engine can leave the factory. Too fast acceleration will lead to a reduction in the working margin of the engine, unstable work, or over-rotation; too slow engine acceleration will increase the take-off distance of the engine. Therefore, the control goal of the acceleration process is to shorten the time as much as possible on the premise of ensuring the stable operation of the engine. According to the statistics of a certain type of engine’s factory test run, among the more than 20 functional inspections and adjustments of its factory inspection, the number of acceleration adjustments is the largest and takes the longest time, and there is basically no adjustment after the acceleration problem occurs in ...

AI Technical Summary

Problems solved by technology

According to the statistics of a certain type of engine’s factory test run, among the more than 20 functional inspections and adjustments of its factory inspection, the number of acceleration adjustments is the most, and the time-consuming is the longest, and there is basically no adjustment after the acceleration problem occurs in high-temperature days. means, severely restricting the factory delivery of the engine

[0003] At present, in order to ensure that the engine does not over-rotate, the control parameters of this type of engine control system are relatively conservative. As a result, the given oil is disconnected from the accelerator oil in advance under high temperature conditions, and the problem of acceleration time deviation from the upper limit or exceeding the limit often occurs.

In order to improve the acceleration, it can only be solved by increasing the acceleration fuel supply, which not only increases the number of test runs and wastes test run resources; it also increases the loss of engine life and reduces the engine stability margin

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