Estimation of optimum number of cycles for combustion analysis using measured in-cylinder pressure signal in conventional CI engine |
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| Affiliation: | 1. Dept. of Information Technology and Electrical Engineering, University of Naples “Federico II”, via Claudio 21, 80125 Naples, Italy;2. Dept. of Electrical and Information Engineering, University of Cassino and Southern Lazio, via G. Di Biasio, 43, 03043 Cassino, Italy;1. School of Electronics and Information, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, China;2. Automation School, Harbin Engineering University, Harbin, Heilongjiang 150001, China;1. National Metrology Institute of Japan, National Institute of Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan;2. The Graduate School for the Creation of New Photonics Industries, Hamamatsu, Shizuoka 431-1202, Japan;3. Graduate School of Mechanical Engineering, Pusan National University 2, Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Repubilc of Korea;1. School of Instrument Science and Opto-Electronic Engineering, Hefei University of Technology, Hefei 230009, China;2. College of Electronic and Information Engineering, Anhui JIANZHU University, Hefei 230601, China |
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| Abstract: | Analysis of measured in-cylinder pressure data provides various parameters that characterize engine combustion process. Advanced engine control technologies use cylinder pressure based combustion parameters for closed loop control. Four step signal processing (i) absolute pressure correction, (ii) crank angle position referencing, (iii) cycle averaging and (iv) filtering is typically applied to get sufficiently accurate cylinder pressure data for an engine cycle. This paper focuses on cycle averaging and filtering of in-cylinder pressure signal from a conventional compression ignition (CI) engine. Experiments are conducted at different engine load and compression ratios at 1500 rpm. The in-cylinder pressure trace of 2500 consecutive engine cycles is recorded and analyzed. Effect of in-cylinder pressure signal noise and cyclic variation on combustion analysis is investigated. A method based on standard deviation of pressure and pressure rise rate is used to find sufficient minimum number of engine cycles to be recorded for averaging to get reasonably accurate pressure data independent of cyclic variability. |
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| Keywords: | Diesel engine Compression ignition Filtering Cyclic variations Cylinder pressure |
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