The adjustable exhaust backpressure device allows for post-installation adjustment of additional backpressure. This allows a user to adjust how much backpressure is generated by testing, adjusting, and then re-testing. The adjustment can generally be performed without removing the device from the exhaust, and without replacing any parts. The adjustable exhaust backpressure device can be placed in any location following the engine. The adjustable exhaust backpressure device includes a body with an exhaust inlet and an exhaust outlet.

An engine exhaust system includes a catalytic converter, an exhaust conduit connected upstream of the catalytic converter, and an oxygen sensor extending into the exhaust conduit at a first axial position of the exhaust conduit. A valve is located within the exhaust conduit at the first axial position. The valve includes a movable throttle plate having a bypass notch formed on a periphery of the plate. The valve has an open position, and a closed position in which the bypass notch is placed adjacent to the oxygen sensor to guide exhaust over the oxygen sensor.

A valve assembly for an exhaust system of a vehicle comprises a housing defining an inlet, an outlet, and a longitudinally extending exhaust gas passageway in fluid communication with the inlet and the outlet. The valve assembly further comprises a valve flap disposed in the housing and rotatable between a first position restricting exhaust gas flow through the exhaust gas passageway, and a second position whereat exhaust gas flow through the exhaust gas passageway is less restricted. A mass damper is disposed within the exhaust gas passageway and attached to the valve flap. The mass damper includes end portions and an intermediate portion disposed between the end portions with the intermediate portion having a thickness that is greater than a thickness of the end portions. The mass damper is positioned proximate an inner surface of the housing and positioned between the valve flap and the housing when the valve flap is at the second position.

An exhaust silencing device and system, a vehicle, and an exhaust silencing method. The exhaust silencing device comprises an air intake pipe (1), a main exhaust silencing cylinder (2), a main exhaust pipe (3), a multi-way valve (6), at least one auxiliary exhaust silencing device (4), and at least one auxiliary exhaust pipe (5); the multi-way valve (6) is in communication with the air intake pipe (1), the main exhaust pipe (3), and the auxiliary exhaust pipe (5); the main exhaust silencing cylinder (2) has one end in communication with the multi-way valve (6) by means of the main exhaust pipe (3), and another end in communication with the outside; and the auxiliary exhaust silencing device (4) has one end in communication with the multi-way valve (6) by means of the auxiliary exhaust pipe (5), and another end in communication with the outside.

An exhaust system for an internal combustion engine and having at least an exhaust duct, which originates from the internal combustion engine and has an end part, which ends with an outlet opening, through which exhaust gases are released into the atmosphere. The end part of the exhaust duct has at least one movable wall, which can be moved to different positions to vary the width of the outlet opening. There are provided a motor-driven actuator device, which is configured to move the movable wall and can be electronically controlled, and a control unit, which is configured to vary, by controlling the actuator device, the position of the movable wall depending on a rotation speed of the internal combustion engine and on an engine load of the internal combustion engine.

A multi-mode muffler for an exhaust system of an internal combustion engine provides a rotary plate that modulates exhaust gas flow between a first and second flow path. Each flow path may provide different sound dampening characteristics, thereby providing different sound profiles with the same muffler. In a disclosed embodiment, the rotary plate is driven by a shaft coupled to an external actuator. Also, a third possible position of the rotary plate may allow flow through both the first and second flow paths, thereby providing a third possible noise profile. One of the sound profiles may be louder than the other thereby allowing the muffler to switch between “loud” and “quiet” modes of operation.

A muffler for a vehicle includes: a muffler shell; a baffle disposed within the muffler shell, and having a first opening and a second opening which allow an exhaust gas to pass therethrough; and a variable valve mounted on the baffle. In particular, the variable valve includes: a valve plate rotatably mounted to open and close the first opening of the baffle; a valve arm connected to the valve plate; and a valve actuator to move the valve arm by variations in pressure of the exhaust gas. The valve plate is capable of rotating in a plane parallel to a plane of the baffle.

Systems and methods for operating an engine that includes an exhaust tuning valve in its exhaust system are described. In one example, a position of the exhaust tuning valve may be adjusted to reduce a possibility of the exhaust tuning valve becoming stuck due to freezing water. In particular, the exhaust tuning valve may be cycled as ambient temperature approaches a temperature at which water freezes.

Methods and systems are provided for adjusting a position of an exhaust valve that regulates engine exhaust noise. In one example, the position of the exhaust valve is adjusted according to a distance between a first vehicle and a second vehicle. The exhaust valve may be adjusted to reduce an exhaust noise level when the distance between the first vehicle and the second vehicle is less than a threshold distance.

The adjustable exhaust backpressure device allows for post-installation adjustment of additional backpressure. This allows a user to adjust how much backpressure is generated by testing, adjusting, and then re-testing. The adjustment can generally be performed without removing the device from the exhaust, and without replacing any parts. The adjustable exhaust backpressure device can be placed in any location following the engine. The adjustable exhaust backpressure device includes a body with an exhaust inlet and an exhaust outlet.