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Driving Cycle Based Control and Calibration for a Turbocharged SI Engine with Low Pressure EGR System
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on September 15, 2020 by SAE International in United States
Low pressure cooled EGR (LPEGR) for SI engines is known to be one of the key technologies to benefit fuel consumption owing to lower pumping loss at part load, knock suppression capability and extended stoichiometric operating range thanks to combustion cooling effect. In order to implement this technology to industrialised application with the optimal performance efficiently and robustly, there are several challenges needs to be solved, especially the EGR estimation accuracy and transport delay model accuracy during transient. And these challenges could be more complex on a turbocharged SI engine due to the much longer intake induction system, and more complex air path model due to the introduction of turbine, compressor and dump valve. This paper describes the control and calibration method for a turbocharged LPEGR engine, and the validation result in WLTC cycle. The test result shows remarkable fuel benefit and good EGR estimation accuracy. Furthermore, the control architecture, EMS co-operation method, control performance and real-world application issue will be also discussed. The introduced LPEGR engine control and calibration development method shows great efficiency, flexibility and robustness, which allows Ricardo to offer the same off-the-shelf service to all the customers.