Method for designing non-linear controller of fuel cell air supply system

A technology of air supply and design method, applied in the field of control, can solve the problems of complex structure of fuel cell air supply system, large control output error, complex nonlinear controller, etc.

Active Publication Date: 2019-04-09
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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  • Method for designing non-linear controller of 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

The invention relates to a method for designing a non-linear controller of a fuel cell air supply system and belongs to the technical field of control. The method provided by the invention designs a controller by utilizing a robust three-step approach specific to a problem of control on coefficient of excess oxygen of an automotive fuel cell, so that optimal power is guaranteed while a fuel cell system obtains sufficient oxygen. The method comprises the following steps: building an air supply system-oriented control model, and designing the controller by virtue of the robust three-step approach. The method provided by the invention combines the three-step approach with robust control and designs the non-linear controller for tracking the coefficient of excess oxygen. The control method provided by the invention has a concise and visual structure and can consider nonlinear characteristic of a system while stability of the system is guaranteed.

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 Applications(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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