ACM Product Capability !¡¦ Based on TI ACM patent of active sensitivity skill, the sensor could detect 2 to 5 ppm CO concentration., which is the average CO concentration in the cities of western countries. Normally it is no necessary to detect low concentration of gas in cities. However it is expected to do so in the country sides. ACM would remind ECU the source of smell nearby. !¡¦ Based on TIACM patent of absolute concentration detect skill, 2 sensors separately exam the absolute concentration of NOx and CO. The advantage is to provide a report of air quality. It also applies to the condition when the gas exists longer time or increases its concentration, to even satisfy the demand of advanced loop circle control strategy. !¡¦ TI ACM favors customers to develop more advanced loop circle control strategy.