Optimal active-disturbance-rejection control method for electromechanical actuator of all-electric brake system

Abstract

The invention discloses an optimal active-disturbance-rejection control method for an electromechanical actuator of an all-electric brake system. The method is an optimal active-disturbance-rejection method based on a finite time observer. The method comprises the following steps: firstly, establishing a mathematical model of an electro-mechanical actuator (EMA) system, and summarizing load change, parameter uncertainty and unmodeled dynamics into lumped disturbance terms of the EMA system; forming an extension system by the extension variables of the system lumped disturbance; designing a finite time observer to estimate system lumped disturbance, and designing a state feedback controller based on a linear active disturbance rejection control theory; constructing a target function of the system according to the ideal control performance; and finally, predicting the brake pressure, solving the reference value of the control input quantity, minimizing the target function, and solving the optimal control gain corresponding to the current state feedback controller. According to the optimal active-disturbance-rejection control method provided by the invention, the control gain can be automatically calculated according to the defined target function, and the optimal control performance can be kept in a relatively wide working range.

Description

technical field [0001] The invention belongs to the technical field of aviation braking, in particular to an optimal active disturbance rejection control method of an electromechanical actuator. Background technique [0002] In the process of taking off and landing, the aircraft braking system plays an important role in ensuring safety. With the development of aviation technology, aircraft braking system can be divided into hydraulic actuation system, electro-hydrostatic actuation system and electromechanical actuation system. Both hydraulic and electro-hydrostatic actuation systems use hydraulic pipes to provide brake pressure, which are bulky and poorly maintained, with the risk of oil leakage. The electromechanical actuating system uses an electromechanical actuator (EMA) to generate braking pressure, which avoids the risk of oil leakage, greatly improves reliability, and reduces volume and weight. Therefore, the electromechanical actuation system is an important develo...

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Problems solved by technology

However, this method only designs the position controller for the brushless DC motor, without considering the mechanical transmission structure with large delay and friction, and it is difficult to achieve the ideal control accuracy

[0006] C.Liu et al. in literature 3 "C.Liu, G.Luo, X.Duan, Z.Chen, Z.Zhang and C.Qiu,"Adaptive LADRC-Based Disturbance Rejection Method for Electromechanical ServoSystem,"in IEEE Transactions on Industry Applications, vol.56, no.1, pp.876-889, Jan.-Feb.2020." proposed an adaptive linear active disturbance rejection control method, but the adaptive process of the controller parameters is mainly based on the actual Insufficient experience and theoretical basis, the introduction of adaptive methods also increases the computational burden

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