NVH Integration of Twin Charger Direct Injected Gasoline Engine
2014 (English)In: SAE International Journal of Passenger Cars - Mechanical Systems, ISSN 1946-3995, E-ISSN 1946-4002, Vol. 7, no 3, 1221-1228 p.Article in journal (Refereed) Published
The increased focus and demands on the reduction of fuel consumption and CO2 requires the automotive industry todevelop and introduce new and more energy efficient powertrain concepts. The extensive utilisation of downsizingconcepts, such as boosting, leads to significant challenges in noise, vibration and harshness (NVH) integration. This is inconflict with the market expectation on the vehicle's acoustic refinement, which plays an increasingly important role interms of product perception, especially in the premium or luxury segment. The introduction of the twin charger boostingsystem, i.e. combining super and turbo charging devices, enables downsizing/speeding in order to achieve improved fueleconomy as well as short time-to-torque, while maintaining high driving dynamics. This concept requires also extensiveconsideration to NVH integration. The NVH challenges when integrating a roots type supercharger are very extensive. Thehigh frequency source characteristics of the supercharger result in complex wave propagation inside the intake ductsystem since exciting pulsation orders are well above duct cut-on frequencies. The source strength in relation to audibleinterior tonal noise threshold is also very high. In addition the background masking levels in terms of mainly combustionrelated powertrain and road noise are low with the consequence that the orders (tonal noise components) can beprominent and annoying even with a high degree of acoustic source treatment (remedies). The scope of this paper is todescribe quantification of the charging system noise radiation and propagation including subsystem target cascadingsynthesis.
Place, publisher, year, edition, pages
2014. Vol. 7, no 3, 1221-1228 p.
Research subject Engineering Acoustics
IdentifiersURN: urn:nbn:se:ltu:diva-15716DOI: 10.4271/2014-01-2087Local ID: f4364c64-df82-442c-96a8-bae90251eab6OAI: oai:DiVA.org:ltu-15716DiVA: diva2:988691
Godkänd; 2015; 20150115 (andbra)2016-09-292016-09-29Bibliographically approved