US 2004/0104345 A1Published application

Method and a measuring system for determining and monitoring exhaust gas emissions from a vehicle

AssigneeValtion Teknillinen Tutkimuskeskus

InventorsMarkku Kansakoski, Pentti Niemela

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Abstract

The invention relates to a method and a measuring system for determining exhaust gas emissions from a moving vehicle (20) by a remote optical measuring technique. According to the invention, the model and/or type of the vehicle (20) under examination is identified, and the driving situation of the vehicle (20) in question is determined at the moment of measurement. A calculatory vehicle model (211, 212) is used to determine a case-specific estimate for the carbon dioxide concentration (CO2) of the exhaust gas plume (40) depending on the vehicle in question and its driving situation. Invention improves the accuracy of determining the concentrations of the actual emission gases (NO, HC, CO) by eliminating the inaccuracy of the carbon dioxide concentration (CO2) values.

Claims29

Dependent claims

A method for determining and monitoring exhaust gas emissions of a moving vehicle (20) or a corresponding object by a remote measuring technique, which method comprises the steps of

forming a measuring beam (50) of infrared radiation, which measuring beam (50) is directed once or several times through an exhaust gas plume (40) emitted by the vehicle (20),
determining, by means of the measuring beam (50), an optical measuring value, such as transmission, for carbon dioxide (CO2), said measuring value indicating the optical absorption caused by carbon dioxide (CO2) contained in the exhaust gas plume (40) in the measuring beam (50),
determining, by means of the measuring beam (50), an optical measuring value, such as transmission, for one or more actual emission gases (NO, CO, HC) each, said measuring value indicating the absorption caused by said emission gas (NO, HC, CO) contained in the exhaust gas plume (40) in the measuring beam (50),
proportioning the optical measuring values determined for the actual emission gases (NO, HC, CO) each with the optical measuring value determined for carbon dioxide (CO2), and
solving, by means of an estimate determined for the carbon dioxide concentration (CO2) of the exhaust gas plume (40), the concentrations of the actual emission gases (NO, HC, CO) in the exhaust gas plume (40) by means of said optical measuring values,
characterized in that for the more precise determination of the actual emission gases (NO, HC, CO) in the exhaust gas plume (40), the method also comprises the steps of
identifying the model and/or type of the vehicle (20) under examination,
determining the driving situation of said vehicle (20) at the moment of measurement, and further
forming a calculatory vehicle model (211, 212) for determining a case-specific estimate for the carbon dioxide concentration (CO2) of the exhaust gas plume (40) depending on the vehicle in question and its driving situation.

6 more elements

A measuring system for determining and monitoring exhaust gas emissions (NO, CO, HC, CO2) from a moving vehicle (20) or a corresponding object by a remote technique, which system comprises

means (60, 70) for forming a measuring beam (50) of infrared radiation and for directing the measuring beam (50) once or several times through an exhaust gas plume (40) emitted by the vehicle (20),
means (60, 30) for determining, by means of the measuring beam (50), an optical measuring value, such as transmission, for carbon dioxide (CO2), said measuring value indicating the optical absorption caused by carbon dioxide (CO2) contained in the exhaust gas plume (40) in the measuring beam (50),
means (60, 30) for determining, by means of the measuring beam (50), an optical measuring value, such as transmission, for one or more actual emission gases (NO, CO, HC) each, said measuring value indicating the absorption caused by said emission gas (NO, HC, CO) contained in the exhaust gas plume (40) in the measuring beam (50),
means (60, 30) for proportioning the optical measuring values determined for the actual emission gases (NO, HC, CO) to the optical measuring value determined for carbon dioxide (CO2), and
means (60, 30) for solving the concentrations of the actual emission gases (NO, HC, CO) of the exhaust gas plume (40) on the basis of the estimate determined for the carbon dioxide concentration (CO2) of the exhaust gas plume (40) and said optical measuring values,
characterized in that for the more precise determination of the actual emission gases (NO, HC, CO) in the exhaust gas plume (40), the measuring system also comprises at least
means (30, 110, 130, 140) for identifying the model and/or type of the vehicle (20) under examination,
means (30, 80, 81, 90, 100, 120) for determining the driving situation of the vehicle (20) at the moment of measuring, and further
means (30) for forming a calculatory vehicle model (211, 212) for determining a case-specific estimate for the carbon dioxide concentration (CO2) of the exhaust gas plume (40) depending on the vehicle (20) in question and its driving situation.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/474,434Filed 9 Oct 2003
Priority: FI 200107299 Apr 2001
Published: 3 Jun 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G01N 21/3504
Using infrared light: for analysing gases, e.g. multi-gas analysis
G01N 21/3518
For analysing gases, e.g. multi-gas analysis: devices using gas filter correlation techniques; Devices using gas pressure modulation techniques
G01N 2021/1795
Remote sensing: atmospheric mapping of gases
G01N 2021/3513
For analysing gases, e.g. multi-gas analysis: open path with an instrumental source