The invention relates to a waste-heat utilization assembly (1) of an internal combustion engine (50), comprising a working circuit (2) that conducts a working fluid. The working circuit (2) is equipped with a feed pump (6), an evaporator (10), an expansion machine (3) and a condenser (4) in the direction of flow of the working fluid. Additionally, the evaporator (10) is also arranged in an exhaust tract (53) of the internal combustion engine (50). The exhaust tract (53) is equipped with an exhaust bypass channel (61) parallel to the evaporator (10), and the exhaust tract (53) is equipped with an exhaust bypass valve (60), by means of which the distribution of the mass flow rate of the exhaust of the internal combustion engine (50) to the evaporator (10) and to the exhaust bypass channel (61) can be controlled. The waste-heat utilization assembly (1) further comprises a cooling device (20, 40, 30) which conducts a coolant, and the condenser (4) is arranged in the cooling device (20, 40, 30). Furthermore, at least one temperature sensor (37, 38, 41, 42, 43, 44) is arranged in the cooling device (20, 40, 30).

Provided is an exhaust flow tube system for use with emissions test equipment, the system comprising: a primary flow tube configured to receive exhaust gases from an engine exhaust pipe and to deliver the exhaust gases to emissions test equipment; a secondary flow tube configured to receive exhaust gases from the engine exhaust pipe and to deliver the exhaust gases to the emissions test equipment; a valve configured to control the flow of exhaust gases through the secondary flow tube; and a control system configured to receive a signal indicative of the flow rate or likely flow rate of exhaust gases from the engine exhaust, and to control the operation of the valve to alter the flow of exhaust gases through the secondary flow tube dependent on the signal.

A muffler valve device for a vehicle may include a chamber fixed at a surface of the wall, a guide rod provided in the chamber and attached at the surface of the wall, a fixing member attached at one end portion of the guide rod and fixing the chamber, a valve disposed slidably on the guide rod between the surface of the wall and the fixing member, and an elastic member located between the valve and the fixing member to provide an elastic force to the valve.

Methods and systems are provided for a soot sensor. In one example, a method diverting exhaust gas from a main exhaust passage to a second exhaust passage comprising a soot sensor with a rotatable component configurable to capture soot.

A valve unit with a valve having a valve shaft with a rotational axis. The valve unit including an actuator having an actuator shaft with a rotational axis. The valve unit includes a mechanical coupler for rotational coupling of the actuator shaft and the valve shaft. The mechanical coupler includes a rotational axis coinciding with the rotational axis of the actuator shaft and the rotational axis of the valve shaft. The valve unit includes a first rotational member coupled to the actuator shaft and a second rotational member coupled to the valve shaft. The valve unit includes a bridge element. The first and the second rotational members include slots for receiving engagement pins of the bridge element.

Methods and systems are provided for a door of an exhaust system of an engine. In one example, a door of an exhaust system may include an outer door pivotable around a first location and an inner door pivotable around a second location, with the inner door positioned within the outer door, and with an amount of opening of an aperture of the outer door adjustable by a position of the inner door.

Systems and methods for controlling a valve for directing an exhaust gas stream through an exhaust duct having a first after treatment device and a second after treatment device in an exhaust system. The method includes receiving sensor signals from a sensor coupled to the second after treatment device. The method includes processing the sensor signals to determine a temperature of the second after treatment device, and determining a position for the valve based on whether the temperature exceeds a pre-defined threshold for the temperature of the second after treatment device. The method includes outputting a control signal to move the valve to a first position in which the exhaust gas stream flows through a first portion of the first after treatment device or a second position in which the exhaust gas stream flows through a second portion of the first after treatment device based on the temperature.

An engine system includes: an engine including a plurality of combustion chambers generating driving torque by combustion of fuel; an exhaust gas purification apparatus installed at an exhaust line in which exhaust gas exhausted from the combustion chambers flows; a bypass line branched from the exhaust line at an upstream side of the exhaust gas purification apparatus and joining the exhaust line at a downstream side of the exhaust gas purification apparatus so that the exhaust gas flowing in the exhaust line bypasses the exhaust gas purification apparatus; and a bypass valve installed at the bypass line.

An exhaust purification system for a ship includes a main path in communication with the outside and a bypass path branched from an intermediate portion of the main path, each serving as a discharge path for an engine installed in the ship. The main path and the bypass path are provided with and opened and closed by respective fluid operated switching valves of a normally open type.

Methods and systems are provided for operating an engine exhaust aftertreatment system to increase the efficiency of an exhaust underbody catalyst and reduce engine emissions. In one example, a bypass passage may be coupled to a main exhaust passage and during conditions which may adversely affect functionality of the underbody catalyst, exhaust may be opportunistically routed via the bypass passage avoiding the underbody catalyst. Exhaust heat may be recovered via a heat exchanger coupled to the bypass passage, and the heat may be used for engine heating, and passenger cabin heating.