Steven W Judy

US Patent:

53159721, May 31, 1994

Filed:

Dec 23, 1991

Appl. No.:

7/838279

Inventors:

Steven W. Judy - Chillicothe IL
Vernon R. Smith - Peoria IL
Alan L. Stahl - Peoria IL

Assignee:

Caterpiller Inc. - Peoria IL

International Classification:

F02B 7700

US Classification:

123198D

Abstract:

In accordance with one aspect of the present invention, an apparatus is provided for a vehicle equipped with a drive system and a controller for regulating the operating speed of the drive system. The apparatus includes at least one sensor for sensing a vehicle parameter and producing a parameter signal in response to the sensed parameter. A diagnostic device is provided for receiving the parameter signal, processing the parameter signal to detect the presence of an undesirable operating condition; determining the severity of the undesirable operating condition in accordance with a preselected strategy and responsively producing a severity level signal. The controller receives the severity level signal and limits the maximum speed of the vehicle in response to the severity level signal, whereby the maximum allowable vehicle speed decreases as the severity level signal increases.

US Patent:

54384893, Aug 1, 1995

Filed:

Sep 30, 1993

Appl. No.:

8/129505

Inventors:

Steven W. Judy - Chillicothe IL
Stephen J. Morey - Peoria IL
April D. Ohlson - East Peoria IL
Weldon L. Phelps - Dunlap IL

International Classification:

H01H 4700

US Classification:

361191

Abstract:

An apparatus, for controllably driving a plurality of solenoids is provided. The apparatus includes a plurality of driver circuits. The plurality of driver circuits are configurable as one of proportional and binary driver circuits. A first number of the plurality of driver circuits include proportional driver circuits and a second number of the plurality of driver circuits include binary driver circuits. The apparatus controllably actuates the proportional driver circuits and the binary driver circuits. The apparatus detects failure conditions on the proportional driver circuits and the binary driver circuits and responsively produces respective failure condition signals. The apparatus is adapted to perform a proportional diagnostics routine on the proportional driver circuits and to perform a binary diagnostics routine on the binary driver circuits via the failure conditions detecting means.

US Patent:

53714601, Dec 6, 1994

Filed:

Sep 21, 1992

Appl. No.:

7/948190

Inventors:

Michael F. Coffman - Metamora IL
Steven W. Judy - Chillicothe IL

Assignee:

Caterpillar Inc. - Peoria IL

International Classification:

G01P 344
G01P 3487
G01B 730

US Classification:

324165

Abstract:

An apparatus for determining the speed and direction of a rotating shaft is provided. The apparatus includes a rotor connected to the shaft. The rotor has a plurality of teeth of alternating widths. The apparatus detects the teeth and responsibly determines the speed and direction of rotation of the shaft.