| 摘要 |
In order to improve a measurement accuracy of an EGR ratio and to downsize the device and to save labor, the EGR ratio measuring device comprises a pair of nondispersive infrared gas analyzers (11), (12) that have a function of correcting a water influence and that can measure a concentration of CO 2 in a gas containing water, an intake air introduction line (L1) that is connected to an intake air pipe (INT) of an internal combustion engine (EG) and that introduces a part of the intake air into one nondispersive infrared gas analyzer (11) without removing the water, an exhaust gas introduction line (L2) that is connected to an exhaust gas pipe (EXT) of the internal combustion engine (EG) and that introduces a part of the exhaust gas into the other nondispersive infrared gas analyzer (12) without removing the water, and a temperature adjusting mechanism (81a - 81c), (82a - 82c) that keeps a temperature of whole of the introduction lines (L1), (L2) and a temperature of the nondispersive infrared gas analyzers (11), (12) so as not to condense dew, and a configuration of the intake air introduction line (L1) including a flow channel length is set to be substantially the same as a configuration of the exhaust introduction line (L2) including a flow channel length. |
