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QFT 기법을 이용한 승용디젤엔진 공연비 제어 알고리즘 설계 연구

Title
QFT 기법을 이용한 승용디젤엔진 공연비 제어 알고리즘 설계 연구
Other Titles
Robust Air-to-fuel Ratio Control Algorithm of Passenger Car Diesel Engines Using Quantitative Feedback Theory
Author
선우명호
Keywords
승용디젤엔진; 배기가스 재순환; 정량적 피드백 이론; 공연비 제어; 강인 제어; Passenger car diesel engine; Exhaust gas recirculation; Quantitative feedback theory; Air-to-fuel ratio control; Robust control
Issue Date
2013-05
Publisher
한국자동차공학회
Citation
Transactions of KSAE, 2013, 21(3), P.88-97
Abstract
This paper presents a robust air-to-fuel ratio (AFR) control algorithm for managing exhaust gas recirculation (EGR) systems. In order to handle production tolerance, deterioration and parameter-varying characteristics of the EGR system, quantitative feedback theory (QFT) is applied for designing the robust AFR control algorithm. A plant model of EGR system is approximated by the first order transfer function plus time-delay (FOPTD) model. EGR valve position and AFR of exhaust gas are used as input/output variables of the plant model. Through engine experiments, parameter uncertainty of the plant model is identified in a fixed engine operating point. Requirement specifications of robust stability and reference tracking performance are defined and these are fulfilled by the following steps: during loop shaping process, a PID controller is designed by using a nominal loop transmission function represented on Nichols chart. Then, the frequency response of closed-loop transfer function is used for designing a prefilter. It is validated that the proposed QFT-based AFR control algorithm successfully satisfy the requirements through experiments of various engine operating points.
URI
http://koreascience.or.kr/article/ArticleFullRecord.jsp?cn=JDCGCC_2013_v21n3_88http://hdl.handle.net/20.500.11754/44732
ISSN
1225-6382; 2234-0149
DOI
10.7467/KSAE.2013.21.3.088
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > AUTOMOTIVE ENGINEERING(미래자동차공학과) > Articles
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