| 摘要 |
<p>Systems for removing exhaust gas samples from internal combustion engines are know said systems comprising: an exhaust gas duct (12) having fluid communication with an exhaust gas source (14) via an exhaust gas inlet (10); an air duct (20) into which ambient air can be suctioned via an air filter (28); a fusion zone (36) arranged downstream of an outflow cross section (18) of the exhaust gas duct (12); and a dilution tunnel (38) through which the exhaust gas/air mixture flows wherein the outflow cross section (18) of the exhaust gas duct (12) is arranged substantially concentric in the air duct (20) and an annular orifice (34) is arranged downstream of the outflow cross section (18) of the exhaust gas duct (12) in the dilution tunnel (38). However the two gas flows are often inadequately mixed. In order to ensure good mixing and representative sampling the invention therefore proposes that means (32, 44, 50) are arranged upstream of the orifice (34) and downstream of the outflow cross section (18) of the exhaust gas channel (12) via which means the exhaust gas flow is deflected in such a manner that the exhaust gas flow is removed directly upstream of the means (32, 44, 50) and asymmetrically from the centre axis of the dilution tunnel (38).</p> |
