Thomas W Larson

US Patent:

55379770, Jul 23, 1996

Filed:

Jan 30, 1995

Appl. No.:

8/380865

Inventors:

Peter G. Hartman - Bloomfield MI
Keith L. Jones - Woodhaven MI
Thomas A. Larson - Bloomfield Hills MI
Gregory T. Weber - Commerce Township MI

Assignee:

Chrysler Corporation - Auburn Hills MI

International Classification:

F02P 514

US Classification:

123422

Abstract:

A method of estimating exhaust gas recirculation in an intake manifold for an internal combustion engine includes the steps of determining a volumetric efficiency value of the intake manifold, determining whether a speed of the engine is accelerating, getting a manifold unfilling constant if the speed of the engine is not accelerating, getting a manifold filling constant if the speed of the engine is accelerating, calculating a K-factor based on the volumetric efficiency value and either the manifold filling constant or manifold unfilling constant, and using the K-factor to modify spark of the engine.

US Patent:

56348681, Jun 3, 1997

Filed:

Jun 7, 1995

Appl. No.:

8/481005

Inventors:

Gregory T. Weber - Commerce MI
Christopher P. Thomas - West Bloomfield MI
Kenneth P. DeGroot - Macomb Township MI
Gerald R. Honkanen - Davisburg MI
Thomas A. Larson - Bloomfield MI

Assignee:

Chrysler Corporation - Auburn Hills MI

International Classification:

F02P 515
F01N 320
F01N 324
F02D 4106

US Classification:

477107

Abstract:

A method for advanced crank spark with blend spark retard for an internal combustion engine includes the steps of selecting whether a spark in an engine cylinder will be fired on a predetermined first or second crank edge during an engine start mode, firing the spark on the second crank edge during the engine start mode if the second crank edge is selected, firing the spark on the first crank edge if the first crank edge is selected, determining whether the internal combustion engine is in the engine start mode based on engine speed, continuing to select whether to fire the spark on the predetermined first crank edge or the predetermined second crank edge if the internal combustion engine is in the engine start mode based on engine speed less than the predetermined speed, and retarding the spark from a first spark level to a hold start level at a predetermined rate, holding the spark at the hold spark level for a hold period, and advancing the spark to the first spark level at the predetermined rate, if the internal combustion engine is in the engine start mode based on engine speed greater than the predetermined speed.

US Patent:

6318334, Nov 20, 2001

Filed:

Mar 1, 2000

Appl. No.:

9/516077

Inventors:

Michael J Reale - Royal Oak MI
Thomas A Larson - Bloomfield Hills MI
Kenneth P DeGroot - Macomb Township MI
Bruce H Teague - Grosse Pointe Park MI

Assignee:

DaimlerChrysler Corporation - Auburn Hills MI

International Classification:

F02D 4300

US Classification:

123198DB

Abstract:

A method for reducing hydrocarbon emissions in an engine of a vehicle. The methodology is triggered following the switching off of the ignition by the operator. First, fuel delivery to the engine is terminated. Second, spark ignition is continued based on a predetermined parameter such as time or engine cycles following the termination of the fuel delivery. Last, spark ignition is stopped. Since combustion continues until no fuel exists in the cylinder, there is no over abundance of fuel in the catalyst at a subsequent start up. As such, the catalyst operates effectively at start up and hydrocarbon emissions are lowered.

US Patent:

55423906, Aug 6, 1996

Filed:

Jan 30, 1995

Appl. No.:

8/380165

Inventors:

Peter G. Hartman - W. Bloomfield MI
Keith L. Jones - Woodhaven MI
Thomas A. Larson - Bloomfield Hills MI
Gregory T. Weber - Commerce Twp. MI

Assignee:

Chrysler Corporation - Auburn Hills MI

International Classification:

F02D 4104
F02M 2507
F02P 515

US Classification:

123412

Abstract:

A method of altitude compensation of exhaust gas recirculation in an intake manifold for an internal combustion engine includes the steps of calculating vacuum at sea level, calculating vacuum at present altitude of the engine, determining whether the calculated vacuum at sea level is equal to the calculated vacuum at present altitude, and correcting the exhaust gas recirculation in the intake manifold if the calculated vacuum at sea level does not equal the calculated vacuum at present altitude.

US Patent:

6236930, May 22, 2001

Filed:

Sep 27, 1999

Appl. No.:

9/406591

Inventors:

Bruce H. Teague - Grosse Pointe Park MI
Kenneth P. DeGroot - Macomb Township MI
Thomas A. Larson - Bloomfield Hills MI

Assignee:

DaimlerChrysler Corporation - Auburn Hills MI

International Classification:

F02D 4114
G05B 1502

US Classification:

701103

Abstract:

The analog input of a sensor is connected to a 10-bit analog-to-digital converter. The converted is powered using a 5V supply. The A/D is interfaced with a microprocessor; however, only the least significant eight bits of the A/D output are connected to the microprocessor input. The microprocessor is used to adjust the fuel-air mixture used in engine combustion based on the output of the sensor. The use of the 10-bit A/D interfaced with only eight bits allows increased precision and increased computational speed. The increased precision allows more accurate adjustment of the fuel-air mixture to enable the engine to run closer to its stoichiometric point.