HCCI Combustion Phasing with Closed-Loop Combustion Control Using Variable Compression Ratio in a Multi Cylinder Engine 2003-01-1830
This study applies Closed-Loop Combustion Control (CLCC) using Variable Compression Ratio (VCR) and cylinder balancing using variable lambda to solve the problem. Step changes of set points for combustion phasing, Compression Ratio (CR), and load together with ramps of engine speed and inlet air temperature are investigated. Performances of the controllers are investigated by running the engine at either a constant amount of injected fuel corresponding to an approximate load of 1.5 or 2.5 bar BMEP and/or constant speed of 2000 rpm. Commercial RON 92 gasoline is used in the test. The CLCC is found to be fast and effective and has a potential of handling step changes in a matter of cycles, while the speed and temperature ramps need some more optimization of the CLCC. The CR controller is very fast and has a time constant corresponding to three engine cycles at 2000 rpm.
Citation: Haraldsson, G., Tunestål, P., Johansson, B., and Hyvönen, J., "HCCI Combustion Phasing with Closed-Loop Combustion Control Using Variable Compression Ratio in a Multi Cylinder Engine," SAE Technical Paper 2003-01-1830, 2003, https://doi.org/10.4271/2003-01-1830. Download Citation
Göran Haraldsson, Per Tunestål, Bengt Johansson, Jari Hyvönen
Division of Combustion Engines, Lund Institute of Technology, Saab Automobile Powertrain
2003 JSAE/SAE International Spring Fuels and Lubricants Meeting
Premixed Charge Ci Engines & Diesel Spray & Mixture Formation-SP-1794, SAE 2003 Transactions Journal of Fuels and Lubricants-V112-4