UEGO Based Measurement of EGR Rate and Residual Gas Fraction

Paper #:
  • 2011-01-1289

Published:
  • 2011-04-12
Citation:
Welling, O. and Collings, N., "UEGO Based Measurement of EGR Rate and Residual Gas Fraction," SAE Technical Paper 2011-01-1289, 2011, https://doi.org/10.4271/2011-01-1289.
Pages:
9
Abstract:
A technique is presented for measuring the exhaust gas recirculation (EGR) and residual gas fraction (RGF) using a fast UEGO-based O₂ measurement of the manifold or in-cylinder gases, and of the exhaust gases. The technique has some advantages over the more common CO₂-based method. In the case of an RGF measurement, fuel interference must be eliminated and special fuelling arrangements are required. It is shown how a UEGO-based measurement, though sensitive to reactive species in the exhaust (such as H₂), as a system reports EGR/RGF rates faithfully. Preliminary tests showed that EGR and RGF measurements using the O₂ approach agreed well with CO₂-based measurements.
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