Method of providing leak free acoustic volume for vehicle frame member

Abstract

A method of forming an acoustic volume in a vehicle component includes providing a vehicle frame member that includes a hollow cavity, forming an internal shell that is completely sealed and which includes at least one connection point, and locating the internal shell within the hollow cavity. At least one exhaust system component is connected to the internal shell at the connection point to provide at least one acoustic volume.

Description

Background technique [0001] Exhaust systems direct hot exhaust gas produced by the engine through various exhaust components to reduce emissions, improve fuel economy, and control noise. Short exhaust systems such as those encountered with hybrid or rear engine vehicles typically do not have sufficient volume and / or length to achieve desired tailpipe noise levels as well as acceptable levels of back pressure. Additionally, as gasoline particulate filter (GPF) technology emerges on the market, there is a need to counteract the corresponding increase in exhaust system back pressure to avoid adverse effects on fuel economy or performance. [0002] In addition to addressing the issues caused by the introduction of GPF technology, other emerging powertrain technologies are demanding even more stringent noise reduction from the industry. Frequencies that need to be attenuated are being pushed to lower and lower magnitudes that were previously unaddressed. A conventional solution t...

AI Technical Summary

Problems solved by technology

A conventional solution to attenuating these frequencies is to provide more internal volume, however, due to compact packaging constraints, there is no area required for such volume

Another solution to attenuate these lower frequencies is to use valves, however, valves lead to higher back pressure at lower rpm which is undesirable

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