Patent ID: 7049595

Claim:
A method for determining and monitoring exhaust gas emissions of a moving vehicle or a corresponding object by a remote measuring technique, the method comprising: forming a measuring beam of infrared radiation, which measuring beam is directed once or several times through an exhaust gas plume emitted by the vehicle, determining, by means of the measuring beam, an optical measuring value for carbon dioxide said measuring value indicating the optical absorption caused by carbon dioxide contained in the exhaust gas plume in the measuring beam, determining, by means of the measuring beam, an optical measuring value for one or more actual emission gases each, said measuring value indicating the absorption caused by said emission gas contained in the exhaust gas plume in the measuring beam, proportioning the optical measuring values determined for the actual emission gases each with the optical measuring value determined for carbon dioxide and solving, by means of an estimate determined for the carbon dioxide concentration of the exhaust gas plume, the concentrations of the actual emission gases in the exhaust gas plume by means of said optical measuring values, wherein for the more precise determination of the actual emission gases in the exhaust gas plume, the method further comprising: identifying the model and/or type of the vehicle under examination, determining the driving situation of said vehicle at the moment of measurement, and further forming a calculatory vehicle model for determining a case-specific estimate for the carbon dioxide concentration of the exhaust gas plume depending on the vehicle in question and its driving situation.