Mechanism and optimization of fuel injection parameters on combustion noise of DI diesel engine

Abstract

Combustion noise takes large proportion in diesel engine noise and the studies of its influence factors play an important role in noise reduction. Engine noise and cylinder pressure measurement experiments were carried out. And the improved attenuation curves were obtained, by which the engine noise was predicted. The effect of fuel injection parameters in combustion noise was investigated during the combustion process. At last, the method combining single variable optimization and multivariate combination was introduced to online optimize the combustion noise. The results show that injection parameters can affect the cylinder pressure rise rate and heat release rate, and consequently affect the cylinder pressure load and pressure oscillation to influence the combustion noise. Among these parameters, main injection advance angle has the greatest influence on the combustion noise, while the pilot injection interval time takes the second place, and the pilot injection quantity is of minimal impact. After the optimal design of the combustion noise, the average sound pressure level of the engine is distinctly reduced by 1.0 dB(A) generally. Meanwhile, the power, emission and economy performances are ensured.

Keywords

diesel engine / injection parameters / pilot injection / combustion noise / online optimization

References

[1] PayriF, TorregrosaA J, BroatchA, MonellettaL. Assessment of diesel combustion noise overall level in transient operation [J]. International Journal of Automotive Technology, 2009, 10(6): 761-769

[2] NguyenT A, MikamiM. Effect of hydrogen addition to intake air on combustion noise from a diesel engine [J]. International Journal of Hydrogen Energy, 2013, 38(10): 4153-4162

[3] LeeJ, HongK, ChoiS, YuS, ChoiH, MinKyoungdoug. Comparison of the effects of multiple injection strategy on the emissions between moderate and heavy EGR rate conditions: Part 1–Pilot injections [J]. Journal of Mechanical Science and Technology, 2013, 27(4): 1135-1141

[4] TorregrosaA J, BroatchA, MargotX, MarantV, BeaugeY. Combustion chamber resonances in direct injection automotive diesel engines: A numerical approach [J]. International Journal of Engine Research, 2004, 5(1): 83-91

[5] PischingerF F, SchmillenK P, LeipoldF W. A new mearuring method for the direct determination of diesel engine combustion noise [R]. SAE Paper 790267, 1979

[6] AndertonD. Relation between combustion system and engine noise [R]. SAE Paper 790270, 1979

[7] RussellM F, HaworthR. Combustion noise from high speed direct injection diesel engines [R]. SAE Paper 850973, 1985

[8] HeZ X, XuanT M, JiangZ C, YanY. Study on effect of fuel injection strategy on combustion noise and exhaust emission of diesel engine [J]. Thermal Science, 2012, 17(1): 81-90

[9] CaiJ-y, CaiY-xi. A new measure to judge diesel engine noise [J]. Small Internal Combustion Engine and Motorcycle, 2005, 34(1): 31-34

[10] PischingerF F. The naval method for measuring diesel combustion noise directly [J]. Noise and Oscillation Control, 1984, 4(5): 34-38

[11] ShuG Q, WeiH Q, WangY J, YangZ Y, WeiJ S. Secondary influence factors of combustion noise mechanism under transient conditions of DI-diesel engine [R]. SAE Paper, 2006-01-1530, 2011

[12] YuW-y, ShanB-l, WangXia. Experimental study of separation and contribution of combustion & mechanical noise in a diesel engine [J]. Small Internal Combustion Engine and Motorcycle, 2011, 40(1): 90-96

[13] WangZ-d, ShenY-g, BiF-r, WengJ Q, LiX N. An experimental study on diesel engine noise indentification between combustion noise and mechanical noise [J]. Internal Combustion Engines, 2007, 6(38–41): 46

[14] AustenA E W, PriedeT. Origins of diesel engine noise [R]. SAE paper, 1959590127

[15] ChoiH, LeeJ, HongK, LeeS, ChoiS, YuS, MinKyoungdoug. Comparison of the effects of multiple injection strategy on the emissions between moderate and heavy EGR rate conditions: Part 2–Post injections [J]. Journal of Mechanical Science and Technology, 2013, 27(7): 2217-2223

[16] CarlucciP, FicarellaA, LaforgiaD. Study of the influence of the injection parameters on combustion noise in a common rail diesel engine using ANOVA and neural networks [R]. SAE Paper, 20012001-01

[17] SelimM Y E. Combustion noise measurements and control from small diesel and dual fuel engines [R]. SAE Paper, 20042004-32

[18] WangS, ChaluC, GautierF. Optimization of combustion noise of modern diesel engines for passenger cars [R]. SAE Paper, 2007

[19] MendezS, ThirouardB. Using multiple injection strategies in diesel combustion: Potential to improve emissions, noise and fuel economy trade-off in low CR engines [R]. SAE Paper, 20082008-01

[20] HwangJ Y, KimD W, JeongW J, ShinD H, KangK T. Optimization of the high frequency noise for the passenger car diesel engine [R]. SAE Paper, 20092001-2009

[21] JungI, JinJ, SoH, NamC, WonKwangmin. An advanced method for developing combustion noise through the analysis of diesel combustion [R]. SAE Paper, 20132013-01

[22] KumbharM S, BhagateR P, NadanasabapathyV, MohanK. Powertrain noise & sound quality refinement for new generation common rail engines [R]. SAE Paper, 20102010-01

[23] NguyenT A, KaiY, MikamiM. Study on combustion noise from a running diesel engine based on transient combustion noise generation model [J]. International Journal of Automotive Engineering, 2012, 3: 131-140

[24] KomoriM, MiuraY, MikamiM, KojimaN. Separation of combustion noise using transient noise generation model [R]. SAE Paper, 20022002-32

[25] LiuY-h, HaoZ-y, BiF-r, FuL H, HanS T. Engine noise source identification with different methods [J]. Transactions of Tianjin University, 2002, 8(3): 174-177

[26] BrandlF, VeitJ, ArndtR, PriebschH H. The application of a new software tool for separating engine combustion and mechanical noise excitation [R]. SAE Paper, 20072007-01