Control method of fluid vector engine based on pwm technology

Abstract

The invention relates to a PWM (Pulse Width Modulator)-based fluid vector engine control method and belongs to the technical field of control of fluid vector engines. The PWM-based fluid vector engine control method comprises the following steps: (1) determining nonlinear characteristics of an azimuth of a fluid vector engine; (2) selecting a valve controller with high response speed and correspondingly high frequency according to the nonlinear characteristics; (3) determining time required for switching-on of a switchgear every time and the maximum on / off frequency within unit time; (4) performing control law design according to wind tunnel data and characteristics of the fluid vector engine; (5) performing software programming according to a control law determined by the step (4); and (6) performing system test and optimizing system control. The PWM-based fluid vector engine control method can realize accurate control of the azimuth of the fluid vector engine.

Description

technical field [0001] The invention relates to a fluid vector engine control method based on pulse width modulation (Pulse Width Modulator, PWM for short) technology, and belongs to the technical field of fluid vector engine control. Background technique [0002] Most of the existing practical aero-engine controls still adopt the direct control method of traditional analog signal output. However, with the continuous improvement of flight performance requirements and the emergence of vector engines, especially the emergence of new fluid vector engines, traditional control methods can no longer meet the requirements of flight performance for engine control in terms of hardware support and control law design. [0003] The appearance of the vector engine has greatly promoted the improvement of the maneuverability of the aircraft, but at the same time it has added new channels and requirements for the control of the engine system. In particular, the emergence of a new generatio...

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Problems solved by technology

[0009] 2) The amount of mutation is as large as figure 1 As shown, the vector angle will directly change from 8 degrees to about 18 degrees when the mutation occurs;

[0011] 4) After the sudden change to the maximum, increase the expected angle, and the vector angle response of the engine increases slowly;

[0012] 5) The response curves of putter and finish do not coincide figure 1 As shown, due to the viscous Cohesion effect of the fluid, the vector angle response is slow at the finish

However, when the vector angle of the engine is deflected to a certain angle, the change of the vector angle will lose linearity and show a hysteresis effect

At this time, the conventional PWM control method is difficult to achieve a satisfactory control effect and cannot meet the requirements of engineering applications.

Therefore, usually the control scheme can only achieve a satisfactory control effect in a small range of vector angles, which greatly limits the performance of the fluid vector engine.

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