| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust reflux rate measuring device capable of accurately obtaining a rate of reflux exhaust contained in mixed gas of fresh charge and the reflux exhaust sucked in by an internal combustion engine provided with an exhaust reflux passage, in other words, an exhaust reflux rate. Ž<P>SOLUTION: A water vapor concentration MCW in the fresh charge is calculated based on a fresh charge humidity Ha1 to be detected and a fresh charge temperature Ta1 and a sonic speed Va2 of the fresh charge at a temperature Tin is calculated based on the water vapor concentration MCW and the temperature Tin of the mixed gas of the fresh air and the reflux exhaust (S12-S16). A sonic speed Vf of the reflux exhaust at the temperature Tin is calculated corresponding to the water vapor concentration MCW, a rate of gas component contained in the reflux exhaust and the temperature Tin (S17, S18). An exhaust reflux rate REGR is calculated by using a sonic speed Vin of the mixed gas detected by an ultrasonic sensor, a sonic speed Va2 of the fresh charge and the sonic speed Vf of the reflux exhaust (S19). Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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