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Design method of nonlinear controller for fuel cell air supply system

An air supply and design method technology, applied in the field of control, can solve the problems of inaccuracy, complex nonlinear controller, complex structure of fuel cell air supply system, etc., and achieve the effect of improving model accuracy and simple and intuitive structure

Active Publication Date: 2021-07-09
JILIN UNIV
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Problems solved by technology

[0003] 1. The fuel cell air supply system has a complex structure and strong nonlinear characteristics, so the controller designed by the linear method has a large control output error and is not accurate enough;
[0004] 2. The nonlinear controller designed in the past is relatively complicated and cannot be combined with stability analysis. There is still a large gap between its theoretical control method and engineering realization

Method used

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  • Design method of nonlinear controller for fuel cell air supply system
  • Design method of nonlinear controller for fuel cell air supply system
  • Design method of nonlinear controller for fuel cell air supply system

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Embodiment Construction

[0126] The invention mainly aims at the problem of controlling the oxygen excess coefficient of the automobile fuel cell, and uses a robust three-step method to design the controller. The controller designed by the robust three-step method consists of three parts: steady-state control, feed-forward control based on reference variables, and robust error feedback control. First, when the system reaches a steady state, the steady state control u s dominates in the controller; secondly, the feed-forward control u f The dynamic behavior of the system is improved by considering the reference variables; then, the nonlinear characteristics of the system are extracted through steady-state control and feed-forward control, and an explicit affine expression oriented to the control model is obtained, which greatly simplifies the design of error feedback, and based on Robust theory designs a feedback loop. Finally, the asymptotic stability of the system is proved under the Lyapunov stabi...

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Abstract

A design method for a nonlinear controller of a fuel cell air supply system belongs to the technical field of control. Aiming at the problem of controlling the excess oxygen coefficient of automobile fuel cells, the present invention uses a robust three-step method to design a controller, so that the fuel cell system can obtain sufficient oxygen while ensuring optimal power and a non-linear controller design method for the fuel cell air supply system . The steps of the invention are: establishment of an air supply system-oriented control model and robust three-step method controller design. The present invention combines the three-step method and robust control to design a nonlinear controller to track the oxygen excess coefficient. This control method has a simple and intuitive structure, and can consider the nonlinear characteristics of the system while ensuring the stability of the system.

Description

technical field [0001] The invention belongs to the technical field of control. Background technique [0002] In recent years, with the continuous development of the world economy and the rapid growth of global car ownership, my country is facing increasing pressure on energy and the environment. Traditional internal combustion engine vehicles are limited by the Carnot cycle, their energy conversion efficiency is low, and a large amount of environmentally unfriendly gases are produced, causing pollution to the environment. Fuel cell vehicles are considered to be the ultimate form of vehicles because of their high energy conversion efficiency, zero emissions, wide range of fuel (hydrogen) sources, and convenient fuel replenishment. In order to make my country's fuel cell industry follow or even exceed the international level, we must control the fuel cell system. Therefore, research on the control scheme of the vehicle fuel cell system and its related equipment is of great ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/418
CPCG05B19/41885G05B2219/32339
Inventor 胡云峰张冲高金武丁一桐郭洪艳许志国史少云陈虹
Owner JILIN UNIV
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