Carbon Dioxide Measuring Technology in Engine Combustion Chambers

The authors have developed an instrument that measures the CO₂ concentration in engine combustion chambers using the infrared absorption method.

The characteristics of this technology are as follows:

1. 1
   Measuring can be carried out while the engine is running at 600r/min to more than 3000r/min, full load operation.
   (Applicable to all EGR conditions)
2. 2
   Quick response; 2ms
3. 3
   High linearity; ±1% Full Scale and under (FS: 10%)
4. 4
   No aggravation is caused to the intake/exhaust performance of engines

This technology contributes to the improvement of the in-cylinder EGR system using, for instance, a variable valve-timing mechanism that is now expanding in number of applications, and also the conventional EGR system.