Measurement of Cycle-by-Cycle AFR using a Fast Response NDIR Analyzer for Cold Start Fuelling Calibration Applications
Date Published: 2006-04-03
Paper Number:2006-01-1515
DOI: 10.4271/2006-01-1515
Citation:
Davis, P. and Peckham, M., "Measurement of Cycle-by-Cycle AFR using a Fast Response NDIR Analyzer for Cold Start Fuelling Calibration Applications," SAE Technical Paper 2006-01-1515, 2006, doi:10.4271/2006-01-1515.
This paper examines cold start of a gasoline PFI engine using a fast λ (normalised AFR) measurement technique. The technique uses established fast gas sensing equipment and post-processing calculations to obtain λ with a response time T
90-10%
of 8ms.
The fast λ is compared with UEGO data. Known characteristics of the UEGO include slower T
90-10%
and output errors when subjected to high quantities of HC; the new technique is shown to avoid these issues.
Five cold starts are performed. Fast λ can resolve each cycle. Differences were seen between the UEGO and fast λ and these are attributed to the characteristics mentioned above. Good repeatability was seen over the starts and the fast λ was similarly repeatable.
This data will be of importance to reduce emissions over this critical part of the drive cycle.
See papers presented at SAE 2006 World Congress & Exhibition, April 2006, Detroit, MI, USA, Session: Emissions Measurement and Testing (Part 4 of 4) Analyser and Test Facility Developments / Detailed Chemical Analysis
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