Construction method for active-disturbance-rejection controller of hybrid electric vehicle BSG system

Abstract

The invention discloses a construction method for an active-disturbance-rejection controller of a hybrid electric vehicle BSG system. Specifically, the method includes the following steps that a composite controlled object is constructed; a second-order extended state observer is constructed; a proper reference trajectory transition process is arranged through a first-order tracking differentiator; the error of an output signal of the first-order tracking differentiator and an output signal of the second-order extended state observer serves as an input signal of a nonlinear PID controller; a signal formed by the output signal of the second-order extended state observer and an output signal of a fuzzy compensator in a superposition mode is combined with an output signal of the nonlinear PID controller to serve as a given input of the composite controlled object; the active-disturbance-rejection controller is constructed to control the composite controlled object. The construction method does not rely on a precise mathematic model of the system, internal disturbance and external disturbance of the system can be ascribed to total disturbance to be observed and compensated, and thus the hybrid electric vehicle BSG system has better disturbance resistance and a better steady-state characteristic.

Description

technical field [0001] The invention relates to a construction method of an active disturbance rejection controller for a BSG system of a hybrid electric vehicle, and belongs to the technical field of hybrid electric vehicle belt-driven starter generator (hereinafter referred to as BSG) control technology. Background technique [0002] The hybrid vehicle BSG system is a strongly coupled nonlinear time-varying complex system. During the actual operation, the system parameters will change suddenly, and there are some serious external disturbances. Therefore, it is necessary to achieve high-quality control of the hybrid vehicle BSG system is very difficult. [0003] The more conventional control method of hybrid electric vehicle BSG system is generally PID control. However, the traditional PID control method has the following disadvantages: (1) Since the combination of linear parameters often does not have the optimal choice, it is easy to cause system rapidity and overshoot (...

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Problems solved by technology

[0002] The hybrid vehicle BSG system is a strongly coupled nonlinear time-varying complex system. During the actual operation, the system parameters will change suddenly, and there are some serious external disturbances. Therefore, it is necessary to achieve high-quality control of the hybrid vehicle BSG system is very difficult

[0003] The more conventional control method of hybrid electric vehicle BSG system is generally PID control. However, the traditional PID control method has the following disadvantages: (1) Since the combination of linear parameters often does not have the optimal choice, it is easy to cause system rapidity and overshoot (2) Since the actual output signal of the system is a smooth signal, and the given signal of the system is not smooth, so taking the rough input signal as the given value of the smooth output signal will cause Oscillation and instability of the system output; (3) Integral control in the PID control method is to eliminate the static error of the system, and then the integral action will cause the system stability to deteriorate, the oscillation will be more severe, and it may also cause integral saturation

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