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Improvements to Diesel Passenger Car Refinement
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Abstract
Diesel engines have become increasingly popular as a power unit for passenger cars over the last decade, due mainly to their superior fuel economy. The first generation of high speed direct injection engines suffered from a lack of refinement by comparison with contemporary spark ignition engines. Analysis of subjective assessments of typical diesel engine noise identified impulsive sounds and the excitation of low frequency resonances as the major reasons for adverse subjective reaction.
In addition torsional resonances in the drive train can be excited by fuelling variations as a result of interactions between hydraulic waves in the fuel injection drillings and pipes (time dependent) and the pump filling and injecting events (speed dependent). Drivetrain resonances can be excited also by rough clutch engagement, road imperfections and sudden increases in fuelling in response to driver demand. These effects have been analysed in some detail and a model-based analysis technique is described which is adequate to develop fuel injection equipment. A parametric analysis identifies the key features in the mechanical components.
Combustion noise from diesel engines can be controlled at source by injection rate modulation, as described in a previous SAE paper. Recently refinement targets for diesel engine noise have been expressed as equalling the best spark ignition engine noise Research into subjective assessment of impulsive noise has indicated a method by which improvements to combustion noise may be assessed.
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Russell, M. and Hulot, O., "Improvements to Diesel Passenger Car Refinement," SAE Technical Paper 981033, 1998, https://doi.org/10.4271/981033.Also In
References
- Fish D G “Vehicle noise quality - towards improving the correlation of objective measurements with subjective ratings” Proc FISITA 92 London 1992 I Mech E C389/468 Engineering for the Customer, Book II Paper 925186
- Russell, M.F. Sekowski, M. Nikokiroulis, N. “Subjective Assessment of Diesel Vehicle Noise” Proc FISITA 1992, I Mech E, C389/044, Engineering for the Customer, Book II Paper 925187 London 1992
- Shiffbanker H Brandl F K Thien G E “Development and application of an evaluation technique to assess the subjective character of engine noise” SAE paper 911081 Proc 1991 SAE conference Traverse City May 1991
- Russell, M F “Sound quality in diesel-powered passenger cars” Proc. AVL Motor und Umweldt Congress 1996 “The Sound of Silence” 5-6 Sept. 1996 Graz
- Russell, M F Worley, S.A. Young C.D. “Towards an Objective Estimate of the Subjective Reaction to Diesel Engine Noise” SAE Noise Vibration Conference Michigan April 28 - 30 1987 SAE 870958 in P195 and SAE Transactions
- Russell, M F “An objective approach to vehicle internal noise assessments” paper C462/205 I Mech E Autotech93 seminar 36 Recent Advances in NVH Technology
- Austen A E W Priede T “Noise of automotive diesel engines: its causes and reduction” S A E paper 1000A Int Auto Eng Congress Detroit Jan 1965
- Russell, M F “Combustion noise in automotive diesel engines” Chapter in Design and Applications in Diesel Engineering Haddad ed Watson Ellis Horwood 1984
- Russell, M F Young, C D “Measurement of diesel combustion noise” proc I Mech E Autotech85 seminar 2S 326 1985
- Anderton, D “Trends in noise generation and its effect on vehicle noise” ATA Intl. conference on Vehicle comfort: Ergonomic, Vibrational, Noise and Thermal Aspects 14-16 Oct. 1992 Bologna
- Russell, M F Young, C D Nicol, S W “Modulation of injection rate to improve direct injection diesel engine noise” SAE paper 900349 Soc. Auto. Engrs. congress Detroit Mar 1990
- Russell M F “Reduction of noise emissions from diesel engine surfaces” SAE paper 720135 Auto Eng Congress Detroit Jan 1972
- Russell, M F Palmer, D C Young, C D “Measurement of noise at source with a view to its control” paper C290/35 Proc I Mech E conference London June 1984
- Russell M F Haworth R “Combustion noise from high speed direct injection diesel engines” Soc. Auto. Engrs. SAE paper 850973 in P-161 Proc Surface Vehicle Noise and Vibration Conference Traverse City May 1985
- Head, H E “A model to predict combustion noise and ignition delay in diesel engines” paper C290/84 Proc I Mech E conference C156 London June 1984 247 256
- Wellstead P. E. “Introduction to Physical System Modelling” Academic Press 1979
- Wellstead P. E. Zarrop M. B. “Self-Tuning Systems: Control and Signal Processing” John Wiley & Sons 1991
- Heywood J. B. “Internal Combustion Engine Fundamentals” McGraw-Hill 1988
- Scotson P. G. Heath W. P. “Crank-Angle Based Control of High Speed Diesel Engines” SAE paper 960619 1996