Locally Resolved Measurement of Gas-Phase Temperature and EGR-Ratio in an HCCI-Engine and Their Influence on Combustion Timing 2007-01-0182
Laser-based measurements of charge temperature and exhaust gas recirculation (EGR) ratio in an homogeneous charge compression ignition (HCCI) engine are demonstrated. For this purpose, the rotational coherent anti-Stokes Raman spectroscopy technique (CARS) was used. This technique allows temporally and locally resolved measurements in combustion environments through only two small line-of-sight optical accesses and the use of standard gasoline as a fuel.
The investigated engine is a production-line four-cylinder direct-injection gasoline engine with the valve strategy modified to realize HCCI-operation. CARS-measurements were performed in motored and fired operation and the results are compared to polytropic calculations. Studies of engine speed, load, valve timing, and injection pressure were conducted showing the strong influence of charge temperature on the combustion timing.
Citation: Weikl, M., Beyrau, F., Leipertz, A., Loch, A. et al., "Locally Resolved Measurement of Gas-Phase Temperature and EGR-Ratio in an HCCI-Engine and Their Influence on Combustion Timing," SAE Technical Paper 2007-01-0182, 2007, https://doi.org/10.4271/2007-01-0182. Download Citation
Markus C. Weikl, Frank Beyrau, Alfred Leipertz, Adam Loch, Christian Jelitto, Jürgen Willand
Lehrstuhl für Technische Thermodynamik (LTT), Friedrich-Alexander Universität Erlangen-Nürnberg, Volkswagen AG
SAE World Congress & Exhibition
Homogeneous Charge Compression Ignition Engines, 2007-SP-2100