Crank-Angle Resolved Temperature in SI Engines Measured by Emission-Absorption Spectroscopy

Paper #:
  • 1999-01-3542

Published:
  • 1999-10-25
Citation:
Aust, V., Zimmermann, G., Manz, P., and Hentschel, W., "Crank-Angle Resolved Temperature in SI Engines Measured by Emission-Absorption Spectroscopy," SAE Technical Paper 1999-01-3542, 1999, https://doi.org/10.4271/1999-01-3542.
Pages:
10
Abstract:
Crank-angle resolved, gas temperatures are determined in the combustion chamber of a Volkswagen (VW) standard-production, port-injected SI engine. During idle, two different methods are applied: (1) a direct spectroscopic emission-absorption technique at a resonance line of potassium, seeded to the air stream to generate sufficient spectral absorptance (‘colouring’ technique), and (2) a more standard, indirect method in which temperatures are derived from pressure recordings using a two-zone thermodynamic model. Combustion temperatures obtained during idle with both the spectroscopic (1) and ‘two-zone’ (2) methods are in good agreement. In addition, the spectroscopic technique is extended to transient operating conditions where the ‘two-zone’ method is not applicable. Combustion temperatures measured during cold-start and abrupt load alteration are in good agreement with former investigations.
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