Method and apparatus for predicting a fuel injector tip...

Details Method and apparatus for predicting a fuel injector tip... Method and apparatus for predicting a fuel injector tip...

2005-04-12

2005-04-12

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C073S114220

Reexamination Certificate

active

06877486

ABSTRACT:
Methods and apparatus for accurately predicting a fuel injector tip temperature (FITT) are described. One technique for predicting the temperature of a fuel injector tip in an engine suitably includes the steps of estimating an initial temperature of the fuel injector tip and calculating a steady state temperature of the fuel injector tip. A filter coefficient is determined as a function of a rate of airflow into the engine, and the temperature of the fuel injector tip is predicted as a function of said initial temperature, the steady state temperature, and the filter coefficient. In a further embodiment, the steady state temperature is filtered into a feedback temperature at a rate that is determined by the filter coefficient.

REFERENCES:
patent: 4656829 (1987-04-01), Creps et al.
patent: 6003498 (1999-12-01), Reddy
patent: 6598471 (2003-07-01), Imoehl
patent: 6609495 (2003-08-01), Cornell et al.

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