Exhaust gas system and method for operating an exhaust gas system
AssigneeDr. Ing. h.c. F. Porsche Aktiengesellschaft
InventorsThomas Laube, Michael Wessels
Life of this patent
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Abstract
An exhaust gas system (1) has a main flow path (2) with an exhaust gas aftertreatment device (4), and a bypass flow path (3) that has a fan (5) and a heating apparatus (6). The bypass flow path (3) has opposite ends connected to the main flow path (2) in regions upstream and downstream of the exhaust gas aftertreatment device (4). A shut-off (7) is arranged in the main flow path (2) upstream of the bypass flow path, and a further shut-off (8) is arranged in the main flow path downstream of the bypass flow path.
Claims14
An exhaust gas system having a main flow path with an exhaust gas aftertreatment device, and a bypass flow path having a fan and a heating apparatus, the bypass flow path has a first end connected to the main flow path upstream of the exhaust gas aftertreatment device and a second end connected to the main flow path downstream of the exhaust gas aftertreatment device, and the exhaust gas system having a first shut-off means arranged in the main flow path upstream of the first end of the bypass flow path and a second shut-off means arranged in the main flow path downstream of the second end of the bypass flow path.
A method for operating an exhaust gas system of an internal combustion engine, the eshaust gas system having a main flow path and an exhaust gas aftertreatment device in the main flow path, the method comprising:
- identifying a request to start the internal combustion engine;
- determining whether the exhaust gas aftertreatment device is at a light-off temperature, closing shut-off means of the main flow path upstream and downstream of the exhaust gas aftertreatment device;
- operating a fan to circulate gas through a bypass flow path and the exhaust gas aftertreatment device while operating a heating apparatus in the bypass flow path;
- and opening the shut-off means of the main flow path when the exhaust gas aftertreatment device reaches the light-off temperature.
Dependencies are inferred from the claim text.