The Distinction between a Special Class of Multiplicative Events and Additive Events: Theory and Application to Automotive Failure Diagnosis

In this paper, we construct a suboptimal generalized likelihood ratio to distinguish between a change in the operating point of an internal combustion engine and a class of actuator failures. The problem is formulated as a binary decision problem between a known multiplicative event and a partially unknown additive event. The resulting algorithm ia simulated and verified using engine models for a number of noise realisations. Both known and unknown event onset times are considered.