The fault diagnosis problem: comparative analysis of Luenberger and Luenberger state observers with sliding modes in a quarter-suspension system for an automobile

Abstract

This paper shows the methodology based on a Luenberger observer and the sliding modes Luenberger observer, to address the fault diagnosis problem in sensors, applied in a ¼ suspension in an automobile. This methodology is based on analyzing residual signals or fault signals, which indicate a consistent or inconsistent operation of the system; its operating principle is based on the comparison of the information of the measured output of the system with the information of the estimated output through the state observer. For this, a threshold is proposed, based on which a decision is made regarding a possible system failure. The tests carried out allow to establish that the design of Luenberger observers and Sliding modes Luenberger observer provides a useful tool for the fault diagnosis problem in systems where the model is known.