Controlling an engine operating parameter during transients...

Details Controlling an engine operating parameter during transients... Controlling an engine operating parameter during transients...

2005-12-06

2005-12-06

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

C123S568210

Reexamination Certificate

active

06973382

ABSTRACT:
Desired engine fueling data FQL—MFD—TQL is processed by a derivative variable time function (40) embodied in an algorithm to develop a data value EGR—MFD—DER representing the time derivative of desired fueling. The algorithm comprises certain selectable parameters (EGR—DTS, EGR—MFD—KF, EGR—MFD—KD). An iteration of the algorithm includes processing FQL—MFD—TQL according to a first function (40A) to yield a first data value and according to a second function (40B) to yield a second data value. A third function (40C) subtracts the second data value from the first to yield a data value for the time derivative that forms one input to a map (42). A second input to the map is a data value for mass airflow (MAF—GMS). The map provides data for calculating the set point of an EGR valve (36). The invention provides improved control of EGR during fueling transients.

REFERENCES:
patent: 6698409 (2004-03-01), Kennedy et al.
patent: 8-21313 (1996-01-01), None

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