Abstract: A dynamic exhaust system is capable of operating at high temperatures and provides a passive, temperature resistant valve for controlling reflection, restriction and/or rerouting of the exhaust gas flow for sound control and/or emissions control in advanced internal combustion engines, such as cylinder deactivation, variable displacement, hybrid power plant, and cold hydrocarbon traps.

Abstract: A valve adaptable for use in altering fluid flow in an exhaust system of a vehicle has a movable member including a valve disk and an assembly element enabling the valve to be mounted to the exhaust system with the disk located substantially parallel to and facing an open end of a preselected exhaust system conduit. The disk is movable along an axis of the open end to vary fluid flow at the open end.

Abstract: The Invention relates to mufflers with variable damping characteristic for motor vehicles with internal combustion engine, comprising a housing (20) with at least one gas pipe (1), terminating in the housing (20), and at least one valve whose closure element (3) closes the end (2) of the pipe (1) in rest position. The closure element (3) is a disk, seated on a guide rod (4). The guide rod (4) is guided in a guide sleeve (5) and performs a lifting mouvement. The spring (8) is positioned in a valve housing (10) which is gastight and connected in gastight manner to the muffler housing (20).