| 摘要 |
The invention concerns an exhaust gas system (1) for an internal combustion engine (11), said system (1) comprising an exhaust gas conduit (13), a particulate filter (15) and a controllable exhaust valve (17) arranged in the exhaust gas conduit (13, said exhaust valve (17) being intended for increasing the exhaust gas temperature (TeXh) by increasing an exhaust gas back pressure in situations where the exhaust gas temperature (TeXh) is too low for performing a regeneration process of the particulate filter (15), a temperature measurement means (12) for determining an exhaust gas temperature (TeXh), a first pressure measurement means (14, 14a) for determining an exhaust gas pressure upstream of the valve (17), a control unit (24) for receiving signals from the measurement means (12, 14) and for controlling the valve (17). The invention is characterized in that the system (1) comprises a second pressure measurement means (16, 16a) including a static pressure measurement outlet (16a) positioned, in relation to the valve (17), in such a way that, when exhaust gas flows in a main flow direction (31) in the conduit (13) and the valve (17) is set in a predetermined partly open position (α), a flow velocity of the exhaust gas is considerably higher when passing by the static pressure measurement outlet (16a) compared with the flow velocity upstream of the valve (17). The inventive system provides means for determining whether a regeneration of the filter (15) is required. The invention also concerns methods related to regeneration of a particular filter and a device and method for controlling a fluid flow, such as an exhaust gas flow.
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