Method and apparatus for remote measurement of exhaust gas

A technology for exhaust gas and exhaust gas flow, which is used in the field of systems for detecting nitrogen oxide content in exhaust gas and telemetry exhaust gas composition such as exhaust gas generated by motor vehicles, which can solve problems such as false assumptions, dependencies, etc.

Inactive Publication Date: 2000-05-17
ENVIRONMENTAL SYST PROD HLDG INC
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Problems solved by technology

The method disclosed by Stedman has disadvantages, for example, it apparently relies on the wrong assumption that the exhaust gas and the fuel have the same hydrocarbon composition

Method used

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  • Method and apparatus for remote measurement of exhaust gas
  • Method and apparatus for remote measurement of exhaust gas

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Embodiment Construction

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0019] The present invention provides a method and apparatus for measuring the composition of exhaust gases from various sources such as motor vehicle engines.

[0020] In general terms, the system of the present invention measures the concentration of a polluting gas in an exhaust stream, such as exhaust from a moving motor vehicle, by analyzing the infrared absorbing species of a sample of the exhaust stream at a selected frequency. The particular frequency selected in the infrared region will depend on the various pollutants, typically including carbon monoxide, carbon dioxide, hydrocarbons, and nitrogen oxides such as nitric oxide. Infrared absorption data can be analyzed and approximate concentrations of pollutants in the exhaust gas can be derived as follows.

[0021] A system for measuring the composition of exhaust gases in the exhaust stream of a motor vehicle while the vehicle is traveling ...

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Abstract

A method and apparatus for sensing a composition of exhaust plume (13) includes a light source (11) that radiates an infrared light beam (12) having a plurality of predetermined wavelengths. A first of the predetermined wavelengths is associated with carbon dioxide and a second of the predetermined wavelengths is associated with a second gas, such as a hydrocarbon or carbon monoxide. The apparatus also includes a detector unit (20) that detects the beam passing through the plume. The apparatus computes a ratio of the second gas to carbon dioxide based upon the first and second detected wavelengths, and this ratio is then multiplied by a predetermined estimation of a concentration of carbon dioxide in the plume.

Description

Background of the invention [0001] (a) Field of Invention [0002] In general, the present invention relates to the monitoring of environmental pollution and, more particularly, to a system for remote sensing of exhaust gas compositions such as those produced by motor vehicles. [0003] (b) Related technical description [0004] Environmental pollution, such as air pollution, is a serious problem, especially in urban areas. Much of this pollution is caused by exhaust fumes from motor vehicles. Government standards are now in place to set allowable limits for certain pollutants in vehicle exhaust, and periodic testing is required in many regions to ensure vehicles meet these standards. [0005] For example, many states have begun mandating periodic inspection and maintenance (I / M) programs in which pollutants in vehicle exhaust are detected and compared to predetermined indicators. If the exhaust from the vehicle does not meet these standards, the vehicle generally must be ...

Claims

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Application Information

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IPC IPC(8): G01N21/35
CPCG01N2021/1793G01N21/3504
Inventor迈克尔·D·杰克杰伊·C·彼得森维戴·R·纳尔逊迈克尔·N·格雷
OwnerENVIRONMENTAL SYST PROD HLDG INC