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research-article

Fault Management System of LP-EGR Using In-Cylinder Pressure Information in Light-Duty Diesel Engines

[+] Author and Article Information
Junhyeong Oh

Department of Automotive Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
qwerty993@hanyang.ac.kr

Kyunghan Min

Department of Automotive Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
kyunghah.min@gmail.com

Manbae Han

Department of Mechanical and Automotive Engineering, Keimyung University 1095 Dalgubeol-daero, Daegu 42601, Republic of Korea
mbhan2002@kmu.ac.kr

Myoungho Sunwoo

Department of Automotive Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
msunwoo@hanyang.ac.kr

1Corresponding author.

ASME doi:10.1115/1.4038078 History: Received April 13, 2017; Revised July 30, 2017

Abstract

Particulate matters (PM) accumulation through a low-pressure exhaust gas recirculation (LP-EGR) path may hinder to obtain the desired LP-EGR rate and thus causes an increase of nitrogen oxides (NOx). The degree of lack of the LP-EGR rate should be detected, i.e. an LP-EGR fault, and a remedy to compensate for the lack of LP-EGR rate should be a mandate to suppress NOx emission, i.e. a fault management. In order to accomplish those objectives, this paper proposes an LP-EGR fault management system which consists of a fault diagnosis algorithm, fault tolerant control algorithm, and an LP-EGR rate model. The model applies a combustion parameter derived from in-cylinder pressure information to the conventional orifice valve model. Consequently, the LP-EGR rate estimation was improved to the maximum error of 2.38 % and RMSE of 1.34 % at various operating condition even under the fault condition compared to that of the conventional model with the maximum error of 7.46 % and RMSE of 5.39 %. Using this LP-EGR rate model as a virtual sensor, the fault diagnosis algorithm determines an LP-EGR fault state, the fault tolerant control determines whether or not to generate the offset of the exhaust throttle valve position. This offset combines with the LUT based feedforward controller to control an LP-EGR rate. As a result of real-time verification of the fault management system in fault condition, the NOx emission decreased by up to about 15 %.

Copyright (c) 2017 by ASME
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