Journal
INTERNATIONAL JOURNAL OF AUTOMOTIVE TECHNOLOGY
Volume 15, Issue 2, Pages 191-201Publisher
KOREAN SOC AUTOMOTIVE ENGINEERS-KSAE
DOI: 10.1007/s12239-014-0021-y
Keywords
HP-EGR VGT diesel engine model; Exhaust manifold pressure observer; Compressor power; Model-based sliding mode control; HiLS (hardware in the loop simulation)
Funding
- MKE (The Ministry of Knowledge Economy), Korea, under the CITRC (Convergence Information Technology Research Center) support program [NIPA-2013-H0401-13-1009]
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In accordance with the development of hardware configurations in diesel engines, research on model-based control for these systems has been conducted for years. To control the air management system of a diesel engine, the exhaust manifold pressure should be selected as one of the control targets due to its internal dynamic stability and its physical importance in model-based control. However, it is difficult to measure exhaust pressure using sensors due to gas flow oscillation in the exhaust manifold in a reciprocated diesel engine. Moreover, the sensor is too costly to be equipped on production engines. Hence, the estimation strategies for exhaust manifold pressure have been regarded as a primary issue in diesel engine air management control. This paper proposes a new estimation method for determining the exhaust manifold pressure based on compressor power dynamics. With its simple and robust structure, this estimation leads to improved control performance compared with that of general observers. To compensate for the compressor efficiency error that varies with turbine speed, some correction maps are adopted in the compressor power equation. To verify the control system performance with the new estimator, a HiLS (hardware in the loop simulation) of the NRTC mode is performed. Experimental verification is also conducted using a test bench for the C1-08 mode.
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