Design and Evaluation of Output Profile Shaping of an Internal Combustion Engine for Noise & Vibration Improvement

Event
SAE 2014 World Congress & Exhibition
Authors Abstract
Content
Engine torque profile shaping strategies have been proposed to reduce noise & vibration for passenger cars. However, it has not been sufficiently studied that feasible torque profile for vibration suppression is dependent on engine speed and target torque shape. On the other hand, combustion pressure profile shaping strategies have been proposed to reduce noise. However, there is almost no research of the quantitative evaluation of contribution of combustion pressure profile.
First, the torque profile shaping was studied. Pre-compensated torque and 2-step torque were selected as typical target torque profiles. An effectiveness of vibration suppression by two torque profiles was evaluated by both drivetrain vibration model and engine torque profile model which have been established well. As a result of studying the torque profile shaping, timing of torque rise by the 2-step torque generation is delayed or advanced. Torque profile by the pre-compensation is deformed in steep change part. Relative degree of deterioration in 2-step torque generation is smaller than that of the pre-compensator.
Second, the combustion pressure profile shaping was studied. A combustion noise generation model was constructed by the combustion pressure, a vibration transfer function in an engine structure, and a radiation factor at the engine surface. The surge in combustion pressure was modeled as triangular shape projection and analyzed in frequency domain to evaluate a contribution to combustion noise. As a result of studying the combustion pressure profile shaping, new analysis method by these models is proposed, so that radiation pressure for quantitative evaluation be obtained.
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DOI
https://doi.org/10.4271/2014-01-1683
Pages
9
Citation
Yamaura, H., Ishihama, M., and Togai, K., "Design and Evaluation of Output Profile Shaping of an Internal Combustion Engine for Noise & Vibration Improvement," SAE Int. J. Engines. 7(3):1514-1522, 2014, https://doi.org/10.4271/2014-01-1683.
Additional Details
Publisher
Published
Apr 1, 2014
Product Code
2014-01-1683
Content Type
Journal Article
Language
English