PROJECT TITLE :

A Second-Order Sliding Mode Observer for Fault Detection and Isolation of Turbocharged SI Engines

ABSTRACT:

This paper proposes a novel technique for detection and isolation of wastegate (WG) faults in a turbocharged (TC) gasoline engine. This paper starts with a fault effect analysis on the WG faults, together with WG stuck open and stuck closed, that is an early step during a detection strategy style. Then, a second-order sliding-mode observer (SOSMO) is proposed to capture the exhaust manifold dynamics. The observer uses experimentally validated engine models to estimate the WG position and a virtual force. The virtual force represents the external disturbances that disrupt the WG operation and enables the proposed SOSMO to estimate the WG position sturdy to the faults. Using this force, a detection and isolation algorithm is presented and experimentally verified on a trendy TC gasoline engine. Check bench results show that the proposed strategy can successfully detect and isolate the 2 completely different WG faults.


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