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Evaluation and Development of
Measurement Components for a Catalytic
Converter Test System
| 题名： | Evaluation and Development of Measurement Components for a Catalytic Converter Test System |
| 作者： | Aibert K. Chan |
| 关键词： | measurement；components；development；evaluation；cata；system；testpoint；pressure；desktop；computer |
| 摘要： | The purpose of this research and development project was to evaluate and configure the components of a test system designed for the analysis of full-scale, vehicle aged automobile catalytic converters. The components tested included an exhaust gas analyzer for measuring hydrocarbon, CO, CO2 and O2 contents and a chemiluminescence detector (CLD) for measuring NOX, as well as thermocouples and pressure meters. A software package (TestPoint vers.2.0b. Capital Equipment was used to develop a computer-based data sampling and acquisition interface with the components and sensors connected to the test system. Tests of the Sun MGA-1200, a non-dispersive infrared (NDH^ analyzer, with CO, CO2 and various hydrocarbons (propane and octane) revealed sensitivity to large pressure changes (greater than 500 mbar). There was no significant cross-sensitivity between the gases except for the slight response of the hydrocarbon (HC) register to water vapor and CO. However, the low range of HC (5-30 vppm) expected in car exhaust after the converter means any cross-sensitivity could have an effect on the measurement, depending on measurement conditions. Tests of the EcoPhysics CLD 700 NO^ meter also indicated sensitivity to pressure. An executable TestPoint runtime application was created to allow near real-time monitoring of the test system using a desktop computer. Nine channels of analog data are fed to a desktop computer via an A/D board and seven exhaust gas parameters through an RS- 232C interface with the MGA-1200. |
| 报告类型： | 科技报告 |
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