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The temperature and velocity field variations of ventilation flow in the passenger compartment were measured simultaneously by using a digital image processing technique. A 1/10 scale vehicle was used for panel-vent mode heating. Micro-encapsulated TLC (Thermochromic Liquid Crystal) particles were used as a reliable tracer for temperature and velocity measurement. Particle color images captured with a 3 CCD (Charge Coupled Device) color video camera were used for calculating the velocity and temperature fields at the same time. To measure the temperature field variations, the HSI (Hue, Saturation, Intensity) true color image processing of TLC particles was applied to the TLC color images. A 2-frame particle tracking velocimetry using the concept of match probability between two consequent image frames was applied to the TLC particle displacements in order to measure the velocity field variations in the passenger compartment.

For a complete automotive HVAC system, it is desirable to keep good air quality control for the interior vehicle cabin. This experimental study for evaluating the CO2 concentration levels in a vehicle cabin was done on the roads in South Korea. Increasing levels of CO2 can cause a passenger to become tired, sleepy and cause headaches or discomfort. The study results shows that CO2 and fine dust concentration is a result of the number of passengers,_driving condition and HVAC user settings. The result from this investigation can be used to establish a development guide for air quality in a vehicle cabin.