Adaptive integral sliding mode fault-tolerant control for diesel engine
air path system via disturbance observer
Abstract
This paper proposes a fault-tolerant control strategy for the air path
system of a turbocharged diesel engine, considering the simultaneous
presence of matched and mismatched external disturbances, additive and
loss of effectiveness fault modes in the EGR and VGT subsystems.
Firstly, a disturbance observer based on H ∞ theory is designed for
estimating additive faults and external disturbances, and the upper
bound of observation error is obtained. Based on the observation
information, an integral sliding mode surface is designed, and the
effectiveness of the sliding mode surface is analyzed. For the loss of
effectiveness faults in the actuators, a novel adaptive update sliding
mode controller is designed. The proposed control algorithm can get the
fault information of the system and achieve fault-tolerant control of
through controller reconstruction. Ultimately, the effectiveness of the
proposed method is validated through simulations and comparative
analysis.