The Internal Combustion Optical Sensor for CNG (ICOS-CNG) from LaVision provides a measurement technique for highly time resolved gas analysis directly in the combustion chamber of internal combustion methane or CNG gas engines. The gas concentration and the local air/fuel ratio are measured with crank-angle resolution. This offers the analysis of the gas mixture formation within hundreds of cycles by this system.

  • for methane or compressed natural gas (CNG) engines
  • air/fuel ratio – lambda value (%lambda%) – transients
  • investigations of mixture formation and homogeneity

%lambda%-transients in gas engines

Crank-angle resolved Lambda-values inside a gas engine with direct port injection are measured with the ICOS-CNG system using a spark plug probe. The engine runs at constant conditions and is operated with methane. The diagram shows the evolution of the Lambda-value at the spark plug location with an early injection at different applied air-fuel-ratios. The process of mixture formation leads to a change from lean to rich mixture before stabilizing at the time of ignition.

Crank angle resolved cylinder-internal lambda-value evolution in a methane gas engine with port-fuel injection at different applied lambda-values.

ICOS-CNG - System specifications


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