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 root-mean-square-error (RMSE) of 1.34% at various operating conditions 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. Based on the state, the fault-tolerant control determines whether or not to generate the offset of the exhaust throttle valve (ETV) position. This offset combines with the look-up table (LUT)-based feedforward controller to control an LP-EGR rate. As a result of real-time verification of the fault management system in the fault condition, the NOx emission decreased by up to about 15%.
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April 2018
Research-Article
Fault Management System of LP-EGR Using In-Cylinder Pressure Information in Light-Duty Diesel Engines
Junhyeong Oh,
Junhyeong Oh
Department of Automotive Engineering,
Hanyang University,
222 Wangsimni-ro, Seongdong-gu,
Seoul 04763, South Korea
e-mail: qwerty993@hanyang.ac.kr
Hanyang University,
222 Wangsimni-ro, Seongdong-gu,
Seoul 04763, South Korea
e-mail: qwerty993@hanyang.ac.kr
Search for other works by this author on:
Kyunghan Min,
Kyunghan Min
Department of Automotive Engineering,
Hanyang University,
Seoul 04763, South Korea
e-mail: kyunghah.min@gmail.com
Hanyang University,
222 Wangsimni-ro
, Seongdong-gu,Seoul 04763, South Korea
e-mail: kyunghah.min@gmail.com
Search for other works by this author on:
Manbae Han,
Manbae Han
Department of Mechanical
and Automotive Engineering,
Keimyung University,
Daegu 42601, South Korea
e-mail: mbhan2002@kmu.ac.kr
and Automotive Engineering,
Keimyung University,
1095 Dalgubeol-daero
,Daegu 42601, South Korea
e-mail: mbhan2002@kmu.ac.kr
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Myoungho Sunwoo
Myoungho Sunwoo
Department of Automotive Engineering,
Hanyang University,
Seoul 04763, South Korea
e-mail: msunwoo@hanyang.ac.kr
Hanyang University,
222 Wangsimni-ro
, Seongdong-gu,Seoul 04763, South Korea
e-mail: msunwoo@hanyang.ac.kr
Search for other works by this author on:
Junhyeong Oh
Department of Automotive Engineering,
Hanyang University,
222 Wangsimni-ro, Seongdong-gu,
Seoul 04763, South Korea
e-mail: qwerty993@hanyang.ac.kr
Hanyang University,
222 Wangsimni-ro, Seongdong-gu,
Seoul 04763, South Korea
e-mail: qwerty993@hanyang.ac.kr
Kyunghan Min
Department of Automotive Engineering,
Hanyang University,
Seoul 04763, South Korea
e-mail: kyunghah.min@gmail.com
Hanyang University,
222 Wangsimni-ro
, Seongdong-gu,Seoul 04763, South Korea
e-mail: kyunghah.min@gmail.com
Manbae Han
Department of Mechanical
and Automotive Engineering,
Keimyung University,
Daegu 42601, South Korea
e-mail: mbhan2002@kmu.ac.kr
and Automotive Engineering,
Keimyung University,
1095 Dalgubeol-daero
,Daegu 42601, South Korea
e-mail: mbhan2002@kmu.ac.kr
Myoungho Sunwoo
Department of Automotive Engineering,
Hanyang University,
Seoul 04763, South Korea
e-mail: msunwoo@hanyang.ac.kr
Hanyang University,
222 Wangsimni-ro
, Seongdong-gu,Seoul 04763, South Korea
e-mail: msunwoo@hanyang.ac.kr
1Corresponding author.
Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received April 13, 2017; final manuscript received July 30, 2017; published online November 7, 2017. Assoc. Editor: Nadir Yilmaz.
J. Eng. Gas Turbines Power. Apr 2018, 140(4): 042802 (11 pages)
Published Online: November 7, 2017
Article history
Received:
April 13, 2017
Revised:
July 30, 2017
Citation
Oh, J., Min, K., Han, M., and Sunwoo, M. (November 7, 2017). "Fault Management System of LP-EGR Using In-Cylinder Pressure Information in Light-Duty Diesel Engines." ASME. J. Eng. Gas Turbines Power. April 2018; 140(4): 042802. https://doi.org/10.1115/1.4038078
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