Adaptive observer for Intake leakage detection in diesel engines described by Takagi-Sugeno model

The problem is motivated by the need to guarantee high-performance engine behavior and in particular to respect the environmentally-based legislative regulations. The complexity of the intake systems of this type of engine makes this task particularly arduous and requires constantly monitoring and diagnosing the engine operation. First of all, a mean value model of a diesel engine subject to leakage in the intake manifold is presented and transformed into Takagi-Sugeno´s model. Then, an adaptive observer for intake leakage estimation is developed. The proposed observer approach allows to estimate simultaneously the system states and a variable that is directly related to the presence of leakage. The diagnosis system is successfully evaluated using an advanced diesel engine professional simulator AMEsim (LMS).