Measurement of Cycle-by-Cycle AFR using a Fast Response NDIR Analyzer for Cold Start Fuelling Calibration Applications 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 T90-10% of 8ms.
The fast λ is compared with UEGO data. Known characteristics of the UEGO include slower T90-10% 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.
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, https://doi.org/10.4271/2006-01-1515. Download Citation
Author(s):
P. W. Davis, M. S. Peckham
Affiliated:
Cambustion Ltd
Pages: 11
Event:
SAE 2006 World Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Emission: Measurement, Testing & Modeling-SP-2024
Related Topics:
Reaction and response times
Air / fuel ratio
Starters and starting
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