Abstract: In a method for operating a urea dosing system in an exhaust aftertreatment system (EATS) of an engine, an ambient temperature is measured in an environment in which the EATS is disposed, one or more temperatures associated with the EATS to which there is a relationship to a temperature of area in the urea dosing system are monitored. After turning off the engine, whether urea in the urea dosing system is subject to freezing is determined based on the measured ambient temperature and the one or more monitored temperatures. A reversion operation is performed after turning off the engine with a delay until one or more events occur, the one or more events including determining that urea in the urea dosing system is subject to freezing. An engine system is also provided.

Abstract: In a method for operating a urea dosing system in an exhaust aftertreatment system (EATS) of an engine, an ambient temperature is measured in an environment in which the EATS is disposed, one or more temperatures associated with the EATS to which there is a relationship to a temperature of area in the urea dosing system are monitored. After turning off the engine, whether urea in the urea dosing system is subject to freezing is determined based on the measured ambient temperature and the one or more monitored temperatures. A reversion operation is performed after turning off the engine with a delay until one or more events occur, the one or more events including determining that urea in the urea dosing system is subject to freezing. An engine system is also provided.

Abstract: An engine arrangement includes an engine (23), an exhaust line (25) connected downstream of the engine, exhaust after treatment equipment (27) in the exhaust line, a temperature sensor (29a-29e) for sensing a temperature of the exhaust after treatment equipment, and a turbo compound arrangement (37) including a turbo compound turbine (39) in the exhaust line. Exhaust flow through the turbo compound arrangement and the exhaust line is modified in response to one or more temperature sensor signals to increase heating of the exhaust after treatment equipment.

Abstract: An engine arrangement includes an engine (23), an exhaust line (25) connected downstream of the engine, exhaust after treatment equipment (27) in the exhaust line, a temperature sensor (29a-29e) for sensing a temperature of the exhaust after treatment equipment, and a turbo compound arrangement (37) including a turbo compound turbine (39) in the exhaust line. Exhaust flow through the turbo compound arrangement and the exhaust line is modified in response to one or more temperature sensor signals to increase heating of the exhaust after treatment equipment.

Abstract: A turbo-charged internal combustion cylinder assembly includes a combustion chamber which may be communicably connected to a compressor via an intake port through an intake manifold and aftercooler so the compressor may provide pre-combustion gases to the combustion chamber when the intake valve is open. An exhaust port communicably connects the combustion chamber to an exhaust manifold. An exhaust valve may open to exhaust post-combustion gases to the exhaust manifold while an intake valve is substantially closed, and the exhaust valve may open to admit post-combustion gases to the combustion chamber while the intake valve is substantially open and an exhaust port pressure in the exhaust port is higher than a combustion chamber pressure in the combustion chamber. A fuel injector may admit fuel to the combustion chamber.