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Knock suppression method for two-stroke aviation kerosene engine

An aviation kerosene and engine technology, applied in engine control, engine components, engine ignition, etc., can solve problems such as engine damage and power drop, and achieve the effects of suppressing knocking, restoring power, and improving power

Active Publication Date: 2021-08-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0006] The present invention aims to overcome the deficiencies in the prior art and provide a knock suppression method based on coordinated control of key parameters. This method is suitable for the calibration of two-stroke aviation kerosene engines and solves the problem of power loss caused by the knocking of aviation kerosene two-stroke engines. Descent and engine damage issues

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  • Knock suppression method for two-stroke aviation kerosene engine
  • Knock suppression method for two-stroke aviation kerosene engine
  • Knock suppression method for two-stroke aviation kerosene engine

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] The engine calibration system of the present invention comprises: dynamometer 1, dynamometer controller 2, two-stroke aviation kerosene engine 3, cylinder pressure sensor 4, rotational speed sensor 5, throttle position sensor 6, oxygen sensor 7, electronic control Unit 8, host computer 9, bench base 10; the bottom of the dynamometer 1 is fixed on the bench base 10 by anchor bolts; the dynamometer controller 2 is installed above the dynamometer 1; the two-stroke aviation The kerosene engine 3 is installed on the stand base 10, and the left end is connected to the dynamometer 1 through a coupling; the cylinder pressure sensor 4 is integrated in the spark plug of the engine; the speed sensor 5, the throttle position sensor 6 and the oxygen sensor 7 are connected in parallel , the throttle position sensor 6 is fixed on the engine intake port, the oxygen se...

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Abstract

The invention discloses a knock suppression method for a two-stroke aviation kerosene engine. The method comprises the following steps that the current engine working condition is judged through a rotating speed sensor and a throttle valve position sensor; in-cylinder pressure fluctuation of n cycles is collected through a knock sensor to judge whether the engine is knocked or not under the current working condition, when the engine is knocked and the knock index KI exceeds a threshold value, the next step is executed, and if the engine is not knocked at the moment, the ignition advance angle is gradually increased till knock occurs; according to the feedback value of an oxygen sensor, the fuel injection pulse width is increased to make the mixed gas be gradually thickened till the excess air coefficient ranges from 0.8 to 0.9; and an electronic control unit is controlled by an upper computer to adjust the ignition phase, and whether the knock index KI does not exceed a threshold value or not is judged. By means of the method, knocking of the kerosene engine can be effectively restrained, the power of the engine can be well recovered, and the defects of gasoline in fuel transportation and storage are overcome.

Description

technical field [0001] The invention relates to the technical field of two-stroke aviation kerosene engines, in particular to a knock suppression method for two-stroke aviation kerosene engines. Background technique [0002] The two-stroke engine has the advantages of high power-to-weight ratio, simple structure, low manufacturing cost, and easy maintenance. Combined with the advantages of aviation kerosene in use, storage, and price, it has a good application value in light aviation aircraft. However, aviation kerosene has poor volatility, and its octane number and auto-ignition temperature are much lower than that of gasoline. Therefore, when it is used as a fuel for an ignition engine, it will usually cause the engine to knock more easily during work, and the engine power will be severely limited. . [0003] Knock is an abnormal combustion phenomenon of a piston engine. At present, it is generally believed that a part of the end mixture spontaneously ignites before the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D43/00F02D41/30F02P5/152
CPCF02D43/00F02D41/30F02P5/152Y02T10/40
Inventor 胡晓生魏民祥沙朝杨佳伟盛奕博姜玉维王志浩吴昊
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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