Method for detecting combustion failure by filtering

Details Method for detecting combustion failure by filtering Method for detecting combustion failure by filtering

2006-07-04

2006-07-04

Vo, Hieu T. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C073S116070

Reexamination Certificate

active

07072760

ABSTRACT:
A method for detecting combustion failure in an internal combustion engine, by calculating an index ln(t) representing engine irregularities at a moment (t) during certain combustion phases in one cylinder; calculating an observation function G(t), which is a function between index ln(t) and an estimated reference value In+/−i(t) at a different moment during engine operation comparing G(t) to a threshold (S), which is a function of engine load (C) and/or rpm (N); and diagnosing a combustion failure when G(t) exceeds (S) or: G(t)=In(t)−ln(t), wherein In(t) is a function of ln(t) and In+/−i(t) represents the index ln(t) after weighting of the values of said index outside an acceptable predefined differential.

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