| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the measurement accuracy of an EGR ratio, to reduce the size of the device, and to save labor. <P>SOLUTION: This EGR ratio measuring device includes: a pair of non-dispersive infrared gas analyzers 11, 12 that have functions of correcting water influences and can measure concentrations of CO<SB>2</SB>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 introduces a part of the intake air into one non-dispersive infrared gas analyzer 11 without removing the water; an exhaust gas introduction line L2 connected to an exhaust gas pipe EXT of the internal combustion engine EG and introducing a part of the exhaust gas into the other non-dispersive infrared gas analyzer 12 without removing the water; and a temperature adjusting mechanism that keeps temperatures of the entire introduction lines L1, L2 and temperatures of the non-dispersive infrared gas analyzers 11, 12 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. <P>COPYRIGHT: (C)2011,JPO&INPIT |
