Research and Development of Controlled Auto-Ignition (CAI) Combustion in a 4-Stroke Multi-Cylinder Gasoline Engine 2001-01-3608
Controlled Auto-Ignition (CAI) combustion has been achieved in a production type 4-stroke multi-cylinder gasoline engine. The engine was based on a Ford 1.7L Zetec-SE 16V engine with a compression ratio of 10.3, using substantially standard components modified only in design dimensions to control the gas exchange process in order to significantly increase the trapped residuals. The engine was also equipped with Variable Cam Timing (VCT) on both the intake and exhaust camshafts. It was found that the largely increased trapped residuals alone were sufficient to achieve CAI in this engine and with VCT, a range of loads between 0.5 and 4 bar BMEP and engine speeds between 1000 and 3500 rpm were mapped for CAI fuel consumption and exhaust emissions. The measured CAI results were compared with those of Spark Ignition (SI) combustion in the same engine but with standard camshafts at the same speeds and loads. The comparison showed more than 30% reduction in BSFC and up to 99% reduction in NOx at low loads.
Citation: Li, J., Zhao, H., Ladommatos, N., and Ma, T., "Research and Development of Controlled Auto-Ignition (CAI) Combustion in a 4-Stroke Multi-Cylinder Gasoline Engine," SAE Technical Paper 2001-01-3608, 2001, https://doi.org/10.4271/2001-01-3608. Download Citation
Jian Li, Hua Zhao, Nicos Ladommatos, Tom Ma
Brunel Univ., Ford Motor Co.
SAE 2002 World Congress & Exhibition
SAE International Fall Fuels & Lubricants Meeting & Exhibition
Hcci Technologies-SP-1642, Homogeneous Charge Compression Ignition (Hcci) Combustion 2002-SP-1688, SAE 2001 Transactions Journal of Fuels and Lubricants-V110-4