Abstract: Ducting is described. The ducting is for use with: a high pressure turbocharger (HPT) having a HPT exhaust gas outlet, and a low pressure turbocharger (LPT) having an LPT exhaust gas inlet. The ducting comprises first and second ducts (LPT). The first duct has a first duct inlet that is connectable to the HPT exhaust gas outlet and a first duct outlet that is connectable to the LPT exhaust gas inlet. The second duct has a second duct inlet for wastegate gases from a wastegate of the and a second duct outlet located within the first duct. The second duct comprises an elongate second duct portion which is a length of the second duct located within the first duct. The second duct portion comprises the second duct outlet and is arranged such that the second duct outlet is pointed towards the first duct outlet.

Abstract: An exhaust manifold for an internal combustion engine is provided. The manifold comprises at least one first exhaust gas inlet connectable to a first bank of cylinders of the engine, and at least one second exhaust gas inlet connectable to a second bank of cylinders of the engine. First and second exhaust gas outlets are connectable to respective first and second volutes of a twin volute turbocharger. At least one wastegate outlet is connectable to a bypass passage which bypasses the turbocharger. A diverter valve is located within the manifold, wherein the diverter valve is adapted to selectively direct exhaust gas from the first and second inlets to at least one of the first and second exhaust gas outlets and the wastegate outlet. A turbocharger is also provided having the same diverter valve arrangement, as are internal combustion engines having either the manifold or turbocharger, and a vehicle having such an internal combustion engine.

Abstract: An exhaust manifold for an internal combustion engine is provided. The manifold comprises at least one first exhaust gas inlet connectable to a first bank of cylinders of the engine, and at least one second exhaust gas inlet connectable to a second bank of cylinders of the engine. First and second exhaust gas outlets are connectable to respective first and second volutes of a twin volute turbocharger. At least one wastegate outlet is connectable to a bypass passage which bypasses the turbocharger. A diverter valve is located within the manifold, wherein the diverter valve is adapted to selectively direct exhaust gas from the first and second inlets to at least one of the first and second exhaust gas outlets and the wastegate outlet. A turbocharger is also provided having the same diverter valve arrangement, as are internal combustion engines having either the manifold or turbocharger, and a vehicle having such an internal combustion engine.

Abstract: A method of operating an internal combustion engine system includes passing exhaust gases from an engine to an aftertreatment device such as a particulate filter at an exhaust temperature less than a target temperature, and increasing a temperature of exhaust gases passing through the aftertreatment device to the target temperature by controllably restricting exhaust flow upstream the filter. The method still further includes generating a signal indicative of exhaust back pressure and reducing exhaust pressure by selectively reducing airflow to the engine responsive to the signal. An internal combustion engine system and associated control system includes an electronic control unit configured to selectively increase a temperature of exhaust gases passing through a particulate filter to a regeneration temperature via a variable flow restriction device.

Abstract: A method of operating an internal combustion engine system includes passing exhaust gases from an engine to an aftertreatment device such as a particulate filter at an exhaust temperature less than a target temperature, and increasing a temperature of exhaust gases passing through the aftertreatment device to the target temperature by controllably restricting exhaust flow upstream the filter. The method still further includes generating a signal indicative of exhaust back pressure and reducing exhaust pressure by selectively reducing airflow to the engine responsive to the signal. An internal combustion engine system and associated control system includes an electronic control unit configured to selectively increase a temperature of exhaust gases passing through a particulate filter to a regeneration temperature via a variable flow restriction device.