Ljubisa M Mladenovic

US Patent:

7139656, Nov 21, 2006

Filed:

Dec 14, 2005

Appl. No.:

11/300532

Inventors:

Ljubisa M. Mladenovic - Ann Arbor MI, US

Assignee:

GM Global Technology Operations, Inc. - Detroit MI

International Classification:

F02D 41/02
G06F 17/00

US Classification:

701102, 731173

Abstract:

A method of dynamically determining a mass airflow per cylinder in order to control operation of an internal combustion engine includes first initializing a mass airflow per cylinder (MAC) value. A manifold pressure (MAP) signal, a mass airflow (MAF) signal, and an induction air temperature (IAT) signal is then received. An estimated manifold pressure is calculated from the MAF, the IAT, and the initialized MAC. A filter is applied to the MAP. A manifold pressure error is determined from the estimated manifold pressure and the filtered manifold pressure. A product is computed of the manifold pressure error and the initialized MAC. The product is adapted. A mass airflow per cylinder is computed, as a second product, based on the adapted product and the initialized MAC. Engine operation is controlled based on the mass airflow per cylinder.

US Patent:

7584044, Sep 1, 2009

Filed:

Feb 5, 2008

Appl. No.:

12/026241

Inventors:

Ljubisa M. Mladenovic - Ann Arbor MI, US
Kenneth J. Cinpinski - Ray MI, US

International Classification:

F02D 13/02

US Classification:

701102, 123 9017

Abstract:

A camshaft phasor control system for an engine includes a position control module. The position control module generates a position control signal based on a camshaft position command signal and a gain signal. A gain circuit generates the gain signal based on the position control signal and feeds the gain signal back to the position control module. The position control module positions a camshaft of the engine based on the gain signal.

US Patent:

8019526, Sep 13, 2011

Filed:

Jun 3, 2008

Appl. No.:

12/132241

Inventors:

Kenneth J. Cinpinski - Ray MI, US
Ljubisa M. Mladenovic - Ann Arbor MI, US
Jerry W. Kortge - Clarkston MI, US
Gregory J. York - Fenton MI, US

International Classification:

F01L 1/34
F02D 41/34

US Classification:

701103, 123 9017

Abstract:

A camshaft phasor control system for an engine includes a camshaft position sensor that generates a current camshaft position signal based on position of a camshaft. A first comparator generates a camshaft position signal based on the current camshaft position signal and a crankshaft position. The second comparator generates an error signal based on the relative camshaft position signal and a commanded camshaft position signal. A control module determines a current control hold duty cycle (CHDC) for a camshaft phasor based on an engine state parameter. The control module also generates a correction signal based on the error signal, adjusts the current CHDC based on the correction signal to generate a commanded CHDC signal, and generates another CHDC based on the commanded CHDC signal.

US Patent:

20060069490, Mar 30, 2006

Filed:

Sep 29, 2004

Appl. No.:

10/953956

Inventors:

Ljubisa Mladenovic - Ann Arbor MI, US
Kenneth Buslepp - Brighton MI, US
Douglas Trombley - Hartland MI, US

International Classification:

F02D 45/00
G06F 19/00
G01M 19/00

US Classification:

701102000, 073118200

Abstract:

A control system that determines a mass air flow through a throttle of an internal combustion engine (ICE) having an intake manifold includes a calculator that calculates an estimated mass air flow based on a throttle position and an adjustment module that determines an adjustment value. The adjustment value is based on the estimated mass air flow, an estimated manifold absolute pressure and a measured manifold absolute pressure. A multiplier multiplies the estimated mass air flow by the adjustment value to determine the mass air flow.