US Patent 11280264 Acoustic insulation system for internal combustion engine

An acoustic insulation system for an internal combustion engine mounted on a vehicle includes: an acoustic insulation cover configured to cover the internal combustion engine with a gap interposed between the acoustic insulation cover and the internal combustion engine. The acoustic insulation cover includes a cover front portion that faces forward of the vehicle. The cover front portion includes: a plurality of inlets for introducing the outside air into the interior of the acoustic insulation cover; and a plurality of inlet flaps configured to respectively open and close the plurality of inlets. The acoustic insulation system further includes a control device configured to control the opening and closing of the plurality of inlet flaps.