Acceleration process control method with self-braking function

Abstract

The invention belongs to the field of aircraft engine design, and relates to an acceleration process control method with a self-braking function. The method comprises the steps of obtaining a given high-pressure rotor rotating speed and a measured high-pressure rotor rotating speed under an actual working condition, and calculating a difference delta n2 between the given high-pressure rotor rotating speed and the measured high-pressure rotor rotating speed; obtaining a given low-pressure rotor rotating speed and a measured low-pressure rotor rotating speed under the actual working condition, and calculating a difference delta n1 between the given low-pressure rotor rotating speed and the measured low-pressure rotor rotating speed; if the difference value delta n2 is greater than a set first threshold value and an engine is in a state of idling or above, entering an acceleration control strategy; and if the difference value delta n2 is smaller than a set second threshold value, or the difference value delta n1 is smaller than a set third threshold value, or a difference value between a set value of the rear exhaust temperature of a low-pressure turbine and a measured value is smaller than a set fourth threshold value, entering a pre-quit control strategy. According to the method, in the acceleration control strategy, the engine transition state performance is guaranteed on the premise that it is guaranteed that the acceleration performance meets the index requirement by delaying the time when given oil disengages from an acceleration line and through the pre-exit strategy.

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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