Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Patent
1999-05-03
1999-12-21
Wolfe, Willis R.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
701110, 701111, G06F 1900
Patent
active
06006157&
ABSTRACT:
A method of detecting internal combustion engine misfires by generating a predicted Karlovitz number as a function of different engine operating conditions such as the air fuel ratio (AFR), the engine speed, the amount of exhaust gas recirculation (EGR), spark-ignition (SI) timing and the airflow rate. The predicted Karlovitz number is then compared against the threshold Karlovitz number in which misfire occurs. The threshold Karlovitz number is determined from a model for misfire predictions in engines and is stored in the electronic engine controller (EEC). A misfire is reported if the predicted Karlovitz number is greater than the threshold Karlovitz number. In another aspect of the invention, the predicted Karlovitz number is generated from submodels of laminar flame speed, laminar flame thickness, turbulence intensity, and turbulence integral length scale.
REFERENCES:
patent: 5337240 (1994-08-01), Nakagawa et al.
patent: 5576963 (1996-11-01), Ribbens et al.
patent: 5893042 (1999-04-01), Lohmann et al.
Regimes of Premixed Turbulent Combustion and Misfire Modeling in SI Engines--Authored by Wen Dai, Stephen G. Russ, Nizar Trigui and Kevin Tallio.
Society of Automotive Engineers, Inc. publication of Oct. 19, 1998, paper No. 982611.
Dai Wengang
Tabaczynski Rodney John
Trigui Nizar
Drouillard Jerome R.
Ford Global Technologies Inc.
Lippa Allan J.
Vo Hieu T.
Wolfe Willis R.
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