Title: A new fault diagnosis method for cold test based on frequency analysis

Authors: Li Wei; Zhang Kun; Chen Xi

Addresses: Department of Control Science and Engineering, Image Processing and Intelligent Control Key Laboratory of Education, Ministry of China, Huazhong University of Science and Technology, Wuhan, 430074, China ' Department of Control Science and Engineering, Image Processing and Intelligent Control Key Laboratory of Education, Ministry of China, Huazhong University of Science and Technology, Wuhan, 430074, China ' Department of Control Science and Engineering, Image Processing and Intelligent Control Key Laboratory of Education, Ministry of China, Huazhong University of Science and Technology, Wuhan, 430074, China

Abstract: An effective model for diesel engine in cold test has been developed in this paper. The mathematical model of diesel engine is mainly composed by four parts: turbocompressor model, intake manifold model, exhaust manifold model and the pressure model of cylinder in cold test. And then a new engine faults diagnosis method based on frequency domain analysis is presented. The typical faults of diesel engine in cold test, including the cylinder work phase fault and intake/exhaust valve phase fault, are distinguished by the amplitude frequency performance of engine torque. And the location of the engine faults is solved by the performance of the phases of low-frequency of engine torque signals. It has been proved to be an effective method to identify and locate the faults of the diesel engine in cold test.

Keywords: cold testing; fault simulation; frequency analysis; engine modelling; fault diagnosis; diesel engines; mathematical modelling; turbocompressor; intake manifold; exhaust manifold; cylinder pressure; amplitude frequency; engine torque.

DOI: 10.1504/IJMIC.2013.052330

International Journal of Modelling, Identification and Control, 2013 Vol.18 No.2, pp.146 - 157

Published online: 31 Jul 2014 *

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