Dual loop speed tracking control for torque management of gasoline engines

The increasing complexity of the engine control systems and its integration with vehicle dynamics control has led to torque-based management of internal combustion engines. The engine speed depends on the torque demand and load torque acting on the engine. In this research work, a dual loop control strategy is proposed to track the desired speed profile for engine torque management. The air control loop has throttle angle as the control variable, whereas speed control loop has injected fuel mass flow rate as the control input. Smooth Super-Twisting Algorithm based control methodology is developed for tracking the desired speed profile. The novel First Principle based Engine Model is employed to formulate the control scheme and compute net piston force which gives direct measure of the engine torque. Effectiveness of the proposed control strategy is demonstrated via numerical simulations.