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US 2008/0167787 A1Published application
Airflow estimation method and apparatus for internal combustion engine
AssigneeGM Global Technology Operations LLC
InventorsJun-Mo Kang, Chen-Fang Chang, Jyh-Shin Chen, Tang-Wei Kuo
Life of this patent
Estimating the term…
Abstract
A model-based estimation of mass airflow is provided which provides an accurate estimation of mass airflow without introducing undesirable time delays characteristic of filtered mass airflow signals.
Claims21
Method for unfiltered intake airflow determination in a substantially unthrottled internal combustion engine, comprising:
- modeling intake airflow using a low-order differential equation including an estimated airflow term and a desired airflow term, wherein the actual airflow follows the desired airflow as described by the low-order differential equation;
- and
- tuning the low-order differential equation in accordance with adaptive parameters, said adaptive parameters operative on the estimated airflow term and the desired airflow term;
- wherein said adaptive parameters are adapted to minimize error between the estimated airflow term and the actual airflow.
1 more element
Apparatus for unfiltered intake airflow determination in an internal combustion engine, comprising:
- airflow control means for controlling airflow to engine combustion chambers without any substantial airflow throttling;
- an airflow sensor measuring substantially unthrottled airflow;
- a closed-loop airflow controller for controlling the airflow control means based on a desired airflow and the measured airflow from the airflow sensor, wherein the controlled airflow follows the desired airflow in such a way that can be described by low-order dynamics;
- s and
- an adaptive airflow estimator for providing a substantially undelayed estimate of airflow based on the desired airflow and adaptive parameters.
2 more elements
Method for unfiltered intake airflow determination in an internal combustion engine, comprising:
- controlling substantially unthrottled airflow to engine combustion chambers using a variable valve actuation system with a feedback controller comprising a low-order differential equation wherein actual airflow closely follows a desired airflow;
- determining an estimated airflow using a low order differential equation and adaptive parameters operative on the estimated airflow and the desired airflow.
Dependencies are inferred from the claim text.