Model-Based Optimal Combustion Phasing Control Strategy for Spark Ignition Engines

Event
SAE 2016 World Congress and Exhibition
Authors Abstract
Content
Combustion phasing of Spark Ignition (SI) engines is traditionally regulated with map-based spark timing (SPKT) control. The calibration time and effort of this feed forward SPKT control strategy becomes less favorable as the number of engine control actuators increases. This paper proposes a model based combustion phasing control frame work. The feed forward control law is obtained by real time numerical optimization utilizing a high-fidelity combustion model that is based on flame entrainment theory. An optimization routine identifies the SPKT which phases the combustion close to the target without violating combustion constraints of knock and excessive cycle-by-cycle covariance of indicated mean effective pressure (COV of IMEP). Cylinder pressure sensors are utilized to enable feedback control of combustion phasing. An Extended Kalman Filter (EKF) is applied to reject sensor noise and combustion variation from the cylinder pressure signal. The proposed combustion phasing frame work is validated with real-time dynamometer tests using a rapid-prototype engine control system. Test results indicate the SPKT control system is able to track the combustion phasing target (CA50) with a RMSE of 3.8 crank angle degrees without violating combustion constraints under both steady state and transient operating conditions. Furthermore, the successful execution of this SPKT control strategy using a rapid-prototype engine controller demonstrates the computational efficiency of the proposed system.
Meta TagsDetails
DOI
https://doi.org/10.4271/2016-01-0818
Pages
10
Citation
Zhu, Q., Prucka, R., Wang, S., Prucka, M. et al., "Model-Based Optimal Combustion Phasing Control Strategy for Spark Ignition Engines," SAE Int. J. Engines 9(2):1170-1179, 2016, https://doi.org/10.4271/2016-01-0818.
Additional Details
Publisher
Published
Apr 5, 2016
Product Code
2016-01-0818
Content Type
Journal Article
Language
English