| 摘要 |
<p>The present invention is one that, in exhaust gas analysis of a vehicle that stops rotation of an engine during driving the vehicle, solves problems due to the engine stop at once, and is provided with, on an upstream side of an analytical instrument 2, an exhaust gas introduction pipe 3 of which one end is opened to an exhaust gas flow path 300 and the other end is connected to the analytical instrument 2, and a switching mechanism that selectively switches between a sampling path L1 that samples exhaust gas from the exhaust gas introduction pipe 3 to introduce the sampled exhaust gas into the analytical instrument 2 and an air introduction path L2 that introduces air into the analytical instrument 2, wherein when the engine is operated, a path to the analytical instrument 2 is switched to the sampling path L1 by the switching mechanism 4, whereas when the engine is stopped, the path is switched to the air introduction path L2 by the switching mechanism.</p> |
