David H Mathews

US Patent:

7188023, Mar 6, 2007

Filed:

Oct 27, 2005

Appl. No.:

11/260876

Inventors:

Gregory F. O'Daniel - Davisburg MI, US
David S. Mathews - Howell MI, US
Douglas J. Moening - Farmington MI, US
Tameem K. Assaf - Milford MI, US

Assignee:

GM Global Technology Operations, Inc. - Detroit MI

International Classification:

F02P 5/152
G01L 23/22

US Classification:

701111, 12340614

Abstract:

A cylinder misfire control system for a displacement on demand (DOD) engine that is operable in an activated mode and a deactivated mode includes a sensor that is responsive to rotation of a crankshaft of the engine and a first module that calculates a time derivative based on a first time period associated with a first deactivated cylinder and a second time period associated with a second deactivated cylinder. The first and second time periods are based on the rotation of the crankshaft. A second module detects a misfire occurrence in an activated cylinder based on the time period derivative.

US Patent:

7610800, Nov 3, 2009

Filed:

Aug 29, 2007

Appl. No.:

11/847109

Inventors:

Xuan Dung T. Avallone - Milford MI, US
John L. Lahti - Novi MI, US
David S. Mathews - Howell MI, US
Leonard G. Wozniak - Ann Arbor MI, US
William R. Cawthorne - Milford MI, US
Robert S Wickman - Westland MI, US

Assignee:

GM Global Technology Operations, Inc. - Detroit MI

International Classification:

G01M 15/06

US Classification:

7311426

Abstract:

A method for collecting crankshaft position data includes rotating a crankshaft of an engine within a selected angular velocity range without any fuel being applied to the engine and measuring crankshaft position data.

US Patent:

7941265, May 10, 2011

Filed:

Jan 28, 2009

Appl. No.:

12/361086

Inventors:

Jon C. Miller - Fenton MI, US
David S. Mathews - Howell MI, US
Mark D. Carr - Fenton MI, US
Ian J. MacEwen - White Lake MI, US

International Classification:

G01L 23/22
G01L 23/00

US Classification:

701111

Abstract:

A system includes a fuel detection module, a misfire detection module, and a fuel control module. The fuel detection module detects when a fuel supplied to an engine having C cylinders has a high drivability index (HIDI), where C is an integer greater than 1. The misfire detection module detects whether M of the C cylinders misfire when the fuel has the HIDI, where M is an integer, and 1≦M

US Patent:

8027782, Sep 27, 2011

Filed:

Sep 16, 2009

Appl. No.:

12/560739

Inventors:

Tameem K. Assaf - Milford MI, US
David S. Mathews - Howell MI, US
John V Bowman - Farmington MI, US
Sanjeev M. Naik - Troy MI, US

International Classification:

F02D 41/10

US Classification:

701111, 1234065, 123436

Abstract:

A control system includes a jerk determination module and a misfire confirmation module. The jerk determination module determines a jerk of a crankshaft associated with a firing event in an engine. The misfire confirmation module selectively confirms that a misfire detected in the engine is valid based on the jerk.

US Patent:

8307808, Nov 13, 2012

Filed:

Apr 19, 2010

Appl. No.:

12/762516

Inventors:

Jeffrey M. Kaiser - Highland MI, US
Timothy M. Karnjate - Grand Blanc MI, US
Christopher E. Whitney - Commerce MI, US
Zhong Li - Novi MI, US
David S. Mathews - Howell MI, US
Eric B. Ferch - Northville MI, US
Pahngroc Oh - Ann Arbor MI, US

International Classification:

F02P 5/00

US Classification:

12340623

Abstract:

An engine control system includes a disturbance module, a torque correction module, a torque-to-spark module, and a spark correction module. The disturbance module determines a disturbance value for a past combustion stroke of a cylinder of an engine based on rotation of a crankshaft. The torque correction module selectively determines a torque correction for a future combustion stroke of the cylinder based on the disturbance value. The torque-to-spark module determines a spark correction based on the torque correction and determines an uncorrected spark timing based on a torque request. The spark correction module determines a corrected spark timing based on the uncorrected spark timing and the spark correction and generates spark during the future combustion stroke based on the corrected spark timing.