Individual Cylinder Air-Fuel Ratio Estimation Algorithm for Variable Valve Lift (VVL) Engines

Paper #:
  • 2010-01-0785

Published:
  • 2010-04-12
Citation:
Kim, J., Oh, S., Lee, K., Sunwoo, M. et al., "Individual Cylinder Air-Fuel Ratio Estimation Algorithm for Variable Valve Lift (VVL) Engines," SAE Technical Paper 2010-01-0785, 2010, https://doi.org/10.4271/2010-01-0785.
Pages:
12
Abstract:
In a multi-cylinder variable valve lift (VVL) engine, in spite of its high efficiency and low emission performance, operation of the variable valve lift brings about not only variation of the air-fuel ratio at the exhaust manifold, but also individual cylinder air-fuel ratio maldistribution. In this study, in order to reduce the air-fuel ratio variation and maldistribution, we propose an individual cylinder air-fuel ratio estimation algorithm for individual cylinder air-fuel ratio control. For the purpose of the individual cylinder air-fuel ratio estimation, air charging dynamics are modeled according to valve lift conditions. In addition, based on the air charging model, individual cylinder air-fuel ratios are estimated by multi-rate sampling from single universal exhaust gas oxygen (UEGO) sensor located on the exhaust manifold. Estimation results are validated with a one-dimensional engine simulation tool. The results of this study indicate that the estimated air-fuel ratios of the individual cylinders closely followed the experimental individual cylinder air-fuel ratios.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$28.00
Mail
$28.00
Members save up to 42% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Technical Paper / Journal Article
2011-05-17
Article
2017-07-26
Training / Education
2017-06-15
Training / Education
2018-02-05
Technical Paper / Journal Article
2011-05-17