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Measure and control

AVL GCA – Gas Exchange and Combustion Analysis Software

Advanced software for the optimization of IC-engine processes

AVL GCA is a highly sophisticated software tool for the thermodynamic analysis of internal combustion engines. As both a ‘virtual sensor’ and a design tool, it provides a variety of insights that can support the optimization of your whole engine design process.

GCA gains its insights in two stages. Firstly, it conducts combustion analysis, followed by gas exchange analysis. The software then feeds these results back into the combustion analysis for a second time, for recalculation with even greater accuracy.

Based on our comprehensive combustion engine simulation tool, AVL BOOST™, GCA providing you with insights such as residual gas content, energy balance and mass flow balance. It considers gas dynamics in both the intake and the exhaust and enables you to conduct plausibility check in stationary and transient operation.


GCA as a Virtual Sensor

Using AVL GCA as a virtual sensor allows you to gain knowledge of otherwise immeasurable values. These include:

  • Residual gas content
  • Scavenging rate
  • Parameter for charge motion
  • Energy balance
  • Wall heat transfer
  • Rate of heat release
  • Efficiency (loss analysis)

Furthermore, it provides you with detail information about combustion quality, the potential for power increase and the potential for reduction of fuel consumption. With this data you can make the best decision to ensure safe operation while also balancing efficiency and therefore the lowest fuel consumption in all operating circumstances.


AVL IndiCom™ Integration

When used online, AVL IndiCom™ features GCA to supply data to the testbed. The offline version is integrated with AVL IndiCom™ offline to conduct extended analysis after testbed data has been acquired.

GCA draws on the 1D simulation functionality of AVL BOOST™ to model parts of the engine in extremely high detail. These one-dimensional thermodynamic calculations play a central role in combustion engine development and help us better understand engine performance.


Transient Operation and Plausibility

Detailed cycle-by-cycle investigation is vital, to gauge emissions and efficiency during transient operation and load changes. This is important to ensure compliance with the New European Driving Cycle (NEDC) test. GCA not only covers transient operations, but also steady-state driving conditions, to assess combustion stability.

Our advanced analysis tool also allows you to calculate a pressure curve to be compared direction with a measured pressured to check the plausibility of the values. To facilitate this, the low-pressure phase of the measured cylinder pressure curve is checked by GCA.

Similarly, you can coordinate the calculation of mass flow via the valves with the testbed measurement of air mass flow and fuel mass flow. This allows GCA to detect the any incorrect measurements of cylinder pressure traces in the intake phase.


Mastering Complexity

Gas exchange and combustion analysis is complex and costly, and this only increases as you take more parameters into account. This requires details knowledge of thermodynamic processes with the combustion chamber. This is especially true, for example, when you are examining the relationship between mixture preparation, charge motion, combustion stability and wall heat loss.

To extend this knowledge GCA provides you with values that cannot be measured directly. Therefore, you are able to gain deep insight into internal engine process and thermodynamic behaviors that cannot be measure directly. You can use this knowledge for Design of Experiment (DoE) engine process optimizations.