Modeling and balancing control for torque generation in combustion event scale for multi-cylinder SI engines

This paper presents a torque balancing control method for multi-cylinder SI engines. The deviation in average torque generation of sections with equal crank angle interval in ignition event scale is introduced as the index for balancing. Moreover, based on crank shaft dynamics in crank angle domain, an estimation method for this index from engine speed measurement is developed to avoid torque measurement. According to analysis in coupling characteristic in torque generation between cylinders, a 2nd order ARMA model is established for the dynamics from spark ignition to the index. Then model predictive control technique is used in regulation. Finally, the proposed model, estimation method and controller are validated by simulation where the engine model is provided by SICE benchmark problem.