Method for detecting failed combustion in an internal...

Details Method for detecting failed combustion in an internal... Method for detecting failed combustion in an internal...

2007-04-10

2007-04-10

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

Reexamination Certificate

active

10546534

ABSTRACT:
Method for detecting misfires of a mixture between a fuel oxidizing agent, in any one of the cylinders of an and an internal combustion engine, by the following steps:a) during at least some of the phases of combustion in at least one of the cylinders, a current value, at an instant (t) of operation of the engine, of an index I(t) representative of operational irregularities in the engine stroke is calculated,b) while the engine is operating, and on the basis of the current value, at the instant (t) of the index I(t), the current value at the same instant (t) of an observation function E(t) is calculated, such that:in-line-formulae description="In-line Formulae" end="lead"?E(t)=I(t)−Ī(t±αt)in-line-formulae description="In-line Formulae" end="tail"?where Ī(t±Δt) is an estimated value of the index I (t) at an instant (t±Δt) different from (t),c) the current value of E(t) is compared with a predetermined threshold (S) dependent on the engine load (C) and/or speed (N), andd) a misfire is diagnosed when the value of E(t) exceeds the threshold (S).

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