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- 검색키워드
- 저자 : A. J. TORREGROSA (검색결과 2 건)
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A. J. TORREGROSA,J. GALINDO,C. GUARDIOLA,O. VARNIER 한국자동차공학회 2011 International journal of automotive technology Vol.12 No.3
This paper presents a methodology for diesel engine intake line analysis that combines specific element tests and modeling. The purpose of this methodology is to determine the impact of intake lines, or newly designed intake elements, on the volumetric efficiency of internal combustion engines while avoiding expensive on-engine tests. For this research, the intake system is divided into several elements which are individually characterized using flow and impulse test rigs. Next, individual systems are modeled using a one-dimensional code. Finally, these component models are coordinated to provide an evaluation of the volumetric efficiency. Intake lines coming from two turbocharged diesel engines are used to illustrate the method. The model is validated by comparing the model results with the actual system performance evaluated in engine test cells. Discussions of the feasibility of the technique and on the impact of element model inaccuracies on the overall system model are provided.
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ASSESSMENT OF DIESEL COMBUSTION NOISE OVERALL LEVEL IN TRANSIENT OPERATION
F. PAYRI,A. J. TORREGROSA,A. BROATCH,L. MONELLETTA 한국자동차공학회 2009 International journal of automotive technology Vol.10 No.6
Combustion noise in passenger cars powered with direct injection (DI) diesel engines is frequently the main reason why end-users are reluctant to drive this type of vehicle. Thus, the great potential of diesel engines for environment preservation -- due to their lower CO2 emissions -- could be missed. This situation worsens with the current design trends (engine downsizing) and the emerging new diesel combustion concepts (Homogeneous Charge Compression Ignition-HCCI, Premixed Charge Compression Ignition-PCCI, etc.), which are intrinsically noisy. This negative feature can be even more critical in transient operation due to the contribution of the temporal changes of both source and transmission path on engine noise. Therefore, combustion noise must be considered as an additional essential factor in engine development, together with performance, emissions and driveability. Thus, suitable evaluation procedures that can be integrated into the global engine development process in a timely and cost-effective manner are imperative. Regarding the evaluation procedures, most of the work available in the literature addressed combustion noise at steady operation. To surpass this limitation, two possible approaches -- adapted from the classical and multiple regression methods -- for the overall level assessment of combustion noise in transient conditions are evaluated in this paper. Combustion noise in passenger cars powered with direct injection (DI) diesel engines is frequently the main reason why end-users are reluctant to drive this type of vehicle. Thus, the great potential of diesel engines for environment preservation -- due to their lower CO2 emissions -- could be missed. This situation worsens with the current design trends (engine downsizing) and the emerging new diesel combustion concepts (Homogeneous Charge Compression Ignition-HCCI, Premixed Charge Compression Ignition-PCCI, etc.), which are intrinsically noisy. This negative feature can be even more critical in transient operation due to the contribution of the temporal changes of both source and transmission path on engine noise. Therefore, combustion noise must be considered as an additional essential factor in engine development, together with performance, emissions and driveability. Thus, suitable evaluation procedures that can be integrated into the global engine development process in a timely and cost-effective manner are imperative. Regarding the evaluation procedures, most of the work available in the literature addressed combustion noise at steady operation. To surpass this limitation, two possible approaches -- adapted from the classical and multiple regression methods -- for the overall level assessment of combustion noise in transient conditions are evaluated in this paper.
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