Title

Implementation of a portable automobile exhaust emission analyzer

College

Gokongwei College of Engineering

Department/Unit

Electronics And Communications Engg

Document Type

Article

Source Title

DLSU Engineering e-Journal

Volume

1

Issue

1

First Page

13

Last Page

27

Publication Date

3-2007

Abstract

The portable automobile exhaust emission analyzer is a device that can measure the gas emissions of both gasoline- and diesel fueled cars. For gasoline-fueled cars, the device detects and displays the amount of the following air pollutants, namely, hydrocarbons (HC), carbon monoxide (CO), and nitrous oxides. For the diesel fueled cars, the device displays the opacity measurement. The portable emission analyzer consists of sensors, input devices, a microcontroller, and an LCD display.

The sensors used are Iridium 50 gas sensor which detects CO and HC, and the NOXO 100 which detects the nitrous oxide. The temperature sensor together with the stroboscope provides the user the temperature and rpm information needed to start the operation of the emission analyzer. A light source, an LDR and a smoke chamber made of aluminum sheet comprised the opacimeter.

The accuracy of the emission analyzer is tested by comparing the test results with LTO registered emission testing center. A 98.88% accuracy for the CO is derived. The precision of the device is also obtained by repeating the test for the same car for ten times. The following precision measurements are gathered: 98.42% for HC, 98.08% for NOX and a 94.49% for the opacimeter.

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Disciplines

Electrical and Electronics

Keywords

Automobiles—Motors—Exhaust systems; Automobiles—Pollution control devices; Air—Pollution—Measurement

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