Thomas J Mathews

US Patent:

7878932, Feb 1, 2011

Filed:

Sep 13, 2007

Appl. No.:

11/854566

Inventors:

Ryan D. Martini - Royal Oak MI, US
Charles J. Van Horn - Novi MI, US
Peter E. Wu - Brighton MI, US
Andrew M. Zettel - Ann Arbor MI, US
Thomas E. Mathews - Pendleton IN, US
Syed Naqi - Ann Arbor MI, US
Darren Crewes - West Bloomfield MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

F16H 3/72

US Classification:

475 5

Abstract:

Monitoring operation of an electro-mechanical transmission having a hydraulic circuit with flow management valves and pressure control solenoids to actuate clutches and pressure monitoring devices to monitor the hydraulic circuit is provided. The transmission operates in fixed gear and continuously variable operating range states. The method comprises controlling position of one of the flow management valves to control operation in one of the operating range states. A fault is detected in the one of the flow management valves based upon outputs of the pressure monitoring devices during steady state operation in one of the continuously variable operating range states. A fault is detected in the one of the flow management valves based upon the output of one of the pressure monitoring devices during a transition in the flow management valve.

US Patent:

8244427, Aug 14, 2012

Filed:

May 24, 2010

Appl. No.:

12/785696

Inventors:

Robert Weiss - Clinton Township MI, US
Thomas E Mathews - Pendleton IN, US
Andrew M. Zettel - Ann Arbor MI, US
Wei D. Wang - Troy MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI
Hewlett-Packard Development, L.P. - Fort Collins CO

International Classification:

G06F 11/00

US Classification:

701 297, 701 303, 701 307, 702 99, 702104, 702116, 702130

Abstract:

A vehicle includes a power inverter module (PIM), a motor/generator unit (MGU), vehicle components, temperature sensors, and a controller. The sensors measure temperatures of a motor winding of the MGU, and temperatures of the multiple phase outputs of the PIM. The second plurality of temperature sensors measures temperatures of the vehicle components. The controller calculates an average temperature of the components, and individually diagnoses each temperature sensor using the average temperature. A control circuit for the vehicle includes the first and second plurality of sensors and the controller. A temperature performance diagnostic method includes using the first plurality to measure a temperature of the motor winding and the phase outputs of the PIM, using the second plurality to measure a temperature of the components, calculating an average temperature of the components, and individually diagnosing the performance of each of the first plurality of sensors using the average temperature.

US Patent:

20090171527, Jul 2, 2009

Filed:

Dec 26, 2007

Appl. No.:

11/964488

Inventors:

THOMAS E. MATHEWS - PENDLETON IN, US

Assignee:

ELECTRONIC DATA SYSTEMS CORPORATION - PLANO TX

International Classification:

G01M 13/02

US Classification:

701 35

Abstract:

Apparatus, and an associated method, for analyzing operation of a multiple-state device, such as a vehicular automatic transmission under multiple-fault occurrence. An identifier identifies all possible path sequences of an initial state responsive to occurrence of all possible faults and all possible remediation actions. The paths are identified for a multiple-fault occurrence of two or more faults. For each of the possible paths, a hazard level is assigned, and the hazard levels are sorted to obtain preferred path sequences. Analysis of the possible paths and their associated hazard levels is made, and a state control scheme is formulated.