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AVL GCA – Gas Exchange and Combustion AnalysisAVL GCA is a sophisticated tool for thermodynamic process analysis of combustion engines (internal combustion engine, IC-direct injection, diesel, HCCI, alternative procedures). AVL GCA can be seen both as “virtual sensor” and as design tool for optimizing the entire engine process.
AVL GCA consists of two calculation steps:
First combustion analysis is executed and subsequently gas exchange analysis is done, whose result is in turn supplied to the combustion analysis which is then calculated for the second time for higher accuracy.
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- AVL GCA is fully integrated in AVL’s indicating software and post-processing software (reduction of interfaces): It is used with AVL IndiCom 1.6. Data are supplied online at the test bed. The offline-version with AVL CONCERTO 3.9 is used for extended analysis in the office afterwards.
- It saves time because results of the entire engine map are available directly at the test bed.
- AVL GCA reduces application expenses through: - simplified systematic and simulation-aided procedure in engine development, - direct ECU parameterization of degree of filling and degree of charging models at the test bed.
- It enables a visualization of internal engine processes and therefore better understanding of these processes.
- AVL GCA secures measuring results through the synergy effects with AVL Visiolution products.
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AVL GCA – THE virtual sensor providing data about characteristics that cannot be measured- residual gas content
- charge motion
- energy balance / mass balance
- wall heat transfer
- gross heat release rate
- efficiency
Specific advantages of AVL GCA:- based on AVL 1-D gas exchange simulation software BOOST
- integrated into AVL IndiCom or AVL CONCERTO
- detailed consideration of internal cylinder processes
- plausibility check of indicating data and conventional measurements
- differentiation between internal EGR and external EGR
- 1-/2-zone model (accuracy heat transfer, NOx emissions)
- “multiport” capability, consideration of “asymmetry” in intake pipe and exhaust, valve deactivation, variable valve control
- consideration of gas dynamics in intake and exhaust
- consideration of flow coefficients for different pressure conditions
- consideration of flow coefficients for intake and exhaust “backflow”
- consideration of non-combusted gases: HC and CO emissions
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