David P Mathews, Age 5931125 Rayburn St, Livonia, MI 48154

6588404, Jul 8, 2003

Dec 19, 2001

10/025228

David Stewart Mathews - Howell MI

General Motors Corporation - Detroit MI

F02P 707

123479, 12340618, 12340662

A method of providing engine timing information for an engine having a plurality of cylinders including detecting a fault for a crankshaft sensor generating engine timing information with a camshaft sensor, providing spark and fuel with the engine timing information generated by the camshaft sensor, and shutting off fuel to at least one of the cylinders.

6609498, Aug 26, 2003

Jul 2, 2001

09/896587

David Stewart Mathews - Howell MI
Donald Clayton Warner - Byron MI
Jason Thomas Davis - Williamston MI

General Motors Corporation - Detroit MI

F02P 500

12340662, 73116, 731173, 701110

A method and apparatus for determining the switching states of a target wheel used in an internal combustion engine, the method including providing a camshaft, providing a target wheel having teeth coupled to the camshaft, providing a sensor to detect the teeth of the target wheel, providing a cam phaser to phase the camshaft relative to a crankshaft of the internal combustion engine, homing the cam phaser to a known position relative to the crankshaft, rotating the crankshaft and camshaft, detecting the switching of the teeth by the sensor, referencing switching information detected by the teeth to crankshaft position information to produce a calibration for the target wheel, and storing the calibration in a controller to be use for control of the internal combustion engine.

6752009, Jun 22, 2004

Aug 3, 2001

09/921438

Timothy L. Minich - South Lyon MI
David Stewart Mathews - Howell MI

General Motors Corporation - Detroit MI

G01M 1500

731173

A target wheel for providing timing information for a crankshaft in an internal combustion engine, the target wheel comprising a substantially circular member having a plurality of teeth, the teeth having variable widths, and the teeth having rising edges distributed in a non-uniform fashion and falling edges distributed in a uniform fashion, where the target wheel provides speed and timing information for multiple internal combustion engine configurations.

6801848, Oct 5, 2004

Jun 25, 2003

10/602376

David S. Mathews - Howell MI

General Motors Corporation - Detroit MI

G01M 1500

701111, 701114, 12340614

Methods and apparatus are provided for sensing a misfire in an engine having at least one cylinder and for providing a misfire indication signal in response to the occurrence of the misfire. The apparatus comprises an electronic controller that calculates an expected time period for a cylinder event during which fuel is combusted in a cylinder to provide an expected time period value. The time period of the cylinder event is measured to provide a measured time period value. The difference between the expected time period value and the measured time period value is calculated to provide a difference time period value. The difference time period value is compared to a predetermined threshold time. The misfire indication signal is provided in response to the difference time period value exceeding the predetermined threshold time.

7036484, May 2, 2006

Apr 16, 2003

10/414702

David S. Mathews - Howell MI, US
Nick S. Kapsokavathis - Shelby Township MI, US

General Motors Corporation - Detroit MI

F02D 41/16

12333911, 12333916, 12333923, 290 40 A

An engine system includes an engine, an alternator, a load, and a controller that communicates with the engine, the alternator, and the load. The controller signals the engine to drive the alternator when the engine idles. When a load increase on the engine is detected, the controller reduces an alternator load on the engine in response to the load increase. Air flow into the engine is adjusted to compensate for the load increase, and concurrently the alternator load is increased. When a load decrease is detected, the alternator load is increased, and the air flow is subsequently adjusted while decreasing the alternator load. In another embodiment, spark timing of the engine is adjusted to compensate for the load decrease.

7188023, Mar 6, 2007

Oct 27, 2005

11/260876

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

GM Global Technology Operations, Inc. - Detroit MI

F02P 5/152
G01L 23/22

701111, 12340614

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.

7353803, Apr 8, 2008

Mar 28, 2006

11/390974

David S. Mathews - Howell MI, US
Tameem K. Assaf - Milford MI, US
David L. St. Pierre - Mason MI, US

GM Global Technology Operations, Inc. - Detroit MI

F02P 5/00
F02M 7/00

12340618, 123436, 73 3508, 701110

The present invention generally includes a method of detecting a misfire in an internal combustion engine. The method includes detecting a first engine speed at a first crankshaft position that corresponds to about a top dead center compression position of a first piston within a first cylinder and detecting a second engine speed at a second crankshaft position that corresponds to about a position subsequent to the top dead center compression position. The method determines whether the misfire occurred in the first cylinder based on the first engine speed and the second engine speed. The method provides an improved signal to noise ratio for engine misfire detection.

7500470, Mar 10, 2009

May 11, 2006

11/432446

Kenneth J. Buslepp - Brighton MI, US
Douglas R. Verner - Sterling Heights MI, US
Randall J. Guild - Okemos MI, US
David S. Mathews - Howell MI, US

GM Global Technology Operations, Inc. - Detroit MI

F02D 41/14

123436, 123673

An engine torque control system for balancing torque output across cylinders of an internal combustion engine includes a first module that determines a derivative term for each cylinder of the engine based on rotation of a crankshaft. A second module determines a torque correction for a first cylinder based on an average derivative term associated with the first cylinder. The second module adjusts a torque output of the first cylinder based on the torque correction and adjusts a torque output of a second cylinder based on the torque correction.