Double corrector for asymmetrical mechanism compensation

Abstract

The invention concerns a method for controlling a mechanism (10) displaying asymmetrical behaviour, the mechanism (10) comprising a first operating direction (F+) and a second operating direction (F-), the control method making it possible to generate, using a control module (24) of a computer (20), a control signal (x_com) from a setpoint signal (x_cons), in which - when the setpoint signal (x_cons) indicates that the mechanism (10) should be operated in the first direction (F+), the control module (24) applies a first corrector (100) to the setpoint signal (x_cons) in order to generate a control signal (x_com), - when the setpoint signal (x_cons) indicates that the mechanism (10) should be operated in the second direction (F-), the control module (24) applies a second corrector (100) to the setpoint signal (x_cons) in order to generate a control signal (x_com), and in which the first and second correctors (100, 200) have different parameters (Kp1, Kp2, Ti1, Ti2), in order to compensate for the asymmetrical behaviour of the mechanism (10).

Description

technical field [0001] The invention relates to electronic valve regulation, in particular to control checks of valves. [0002] The invention finds particular application in aircraft turbines, such as open rotors. [0003] The invention will be described in this context, but is applicable to any mechanism with undesired or unintended functional asymmetry. Background technique [0004] A statement of the prior art and the problem identified by the applicant [0005] An open rotor is an aircraft engine whose structure consists of a gas generator and a propulsion unit equipped with a power turbine, a propeller gearbox (PGB) and a pair of unducted counter-rotating variable pitch propellers. [0006] Delivering very high torque to the propeller results in high heat rejection which can damage PGBs and other equipment designed to operate within certain restricted temperature ranges. [0007] The PGB is both oil cooled and oil lubricated. To obtain the desired temperature, a th...

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Problems solved by technology

[0027] This obviously creates a regulation problem: homogeneous behavior with local loops and therefore homogeneous behavior with full regulation

[0028] A "slow" corrector synthesized by taking into account the "fast" transfer function will not allow to meet the requirements regarding the rapidity of the slow behavior of the system during negative control changes

[0029] Conversely, a "fast" corrector synthesized by taking into account the "slow" behavior will not allow satisfying the requirements regarding the spillover aspects of the fast behavior of the system during positive control changes

[0030] Therefore, in terms of both speed and overflow, conventional servo control solutions do not allow to meet the specifications

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