Internal combustion engine control with model-based barometric p

Details Internal combustion engine control with model-based barometric p Internal combustion engine control with model-based barometric p

1998-10-16

2000-01-18

Dolinar, Andrew M.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

731173, 731182, F02D 4500

Patent

active

060164603

ABSTRACT:
An improved engine control utilizes a model-based technique to obtain an accurate estimate of barometric pressure with significantly reduced calibration time and effort. A mathematical model of mass air flow through the engine intake system is used to estimate the pressure ratio across the intake system as a function of mass air flow, the effective intake area, and the intake air pressure and temperature. The barometric pressure is then determined from the estimated ratio, and used in the calculation of various gas flows for control purposes. The mass air flow information may be provided by a mass air flow sensor, or alternatively, may be determined based on engine flow rate estimations. Because the estimation is model-based, no special calibration is needed to ensure accuracy at high altitudes.

REFERENCES:
patent: 4926335 (1990-05-01), Flowers
patent: 5012422 (1991-04-01), Takahashi et al.
patent: 5070846 (1991-12-01), Dudek et al.
patent: 5615657 (1997-04-01), Yoshizawa

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