Estimation of oxygen concentration in the intake manifold of...

Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C123S480000, C123S568160

Reexamination Certificate

active

07107143

ABSTRACT:
A method of estimating oxygen concentration in the intake of a lean burn engine is accomplished during throttled operation by repeatedly combining determined air/fuel ratio and intake mass air flow and estimated cylinder mass flow and exhaust gas recirculation flow in a state observer, which calculates exhaust and intake burned gas fractions and resulting percent oxygen in the intake manifold. During unthrottled operation, estimation is corrected by an adaptive disturbance estimator, which operates to correct all input disturbances under conditions of higher EGR and to correct only MAF flow values under lower EGR conditions. Steps for operation of the state observer and for determining or estimating input conditions to the state observer are set forth.

REFERENCES:
patent: 5205260 (1993-04-01), Takahashi et al.
patent: 6360726 (2002-03-01), Javaherian
patent: 6871134 (2005-03-01), Lange et al.
patent: 2006/0054134 (2006-03-01), Henn et al.
“Air Charge Estimation in Camless Engines”, M. J. van Nieuwstadt, I. V. Kolmanovsky, M. Haghgooie, and M. Hammoud, SAE paper 2001-01-0581.
“Observers for Linear Systems with Unknown Outputs”, P. Kudva, N. Viswanadham, and A. Ramakrishna, IEEE Transactions on Automatic Control, vol. 25, No. 1, pp. 113-115, Feb. 1980.
“Nonlinear Reduced-Order State and Parameter Observer”, D. A. Haessig and B. Friedland, Proceedings of American Control Conference, pp. 1978-1980, Arlington, VA, Jun. 2001.
“Simple Unknown Input Estimation Techniques for Automotive Applications”, A. Stotsky and I . Kolmanovsky, Proceedings of American Control Conference, pp. 3312-3317, Arlington, VA, Jun. 2001.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Estimation of oxygen concentration in the intake manifold of... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Estimation of oxygen concentration in the intake manifold of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Estimation of oxygen concentration in the intake manifold of... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3618759

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.