“Evaluation of the Drift of vehicle Inspection/Maintenance Emission Analyzers in use- A California Case Study” 891119
Quality assurance (QA) in motor vehicle emissions inspection/maintenance (I/M) programs is a continuing concern, especially in decentralized programs with hundreds or even thousands of licensed stations. The emissions analyzers used in such stations are an important focus of governmental QA efforts because of the central role of analyzers in determining which vehicles need to be repaired. Therefore, the In-use performance of I/M emission analyzers has a large impact on the quality of 1/M programs as a whole. This paper reports on the results of an investigation in California designed to determine in-use performance of emission analyzers in the field. The investigation was designed to evaluate both drift rates and the ability of analyzer systems with automatic gas calibration capability to correct analyzer responses outside of accepted tolerances.
Citation: Carhart, B., Moore, T., Peters, T., and Sherwood, L., "“Evaluation of the Drift of vehicle Inspection/Maintenance Emission Analyzers in use- A California Case Study”," SAE Technical Paper 891119, 1989, https://doi.org/10.4271/891119. Download Citation
Bruce S. Carhart, T. J. Moore, Thomas A. Peters, Larry D. Sherwood
Engineering-Science, Inc., California Bureau of Automotive Repair
SAE Government Industry Meeting and Exposition