Cheryl L Greenly

US Patent:

6456083, Sep 24, 2002

Filed:

Mar 3, 2000

Appl. No.:

09/518615

Inventors:

Kirit A. Thakkar - Parma OH
Cheryl Greenly - Elyria OH
William Amato - Avon OH
Roman Marchak - Sheffield Lake OH

Assignee:

Bendix Commercial Vehicle Systems LLC - Elyria OH

International Classification:

G01R 3100

US Classification:

324500, 324 731, 3241581

Abstract:

A method and apparatus for diagnosing short circuit conditions in a circuit protects circuit components from being damaged during a diagnostic operation. The apparatus includes a control processor, a control circuit coupled to the control processor, and an A/D converter coupled to the control processor and the control circuit. In operation the control processor disables operation of an A/D converter after completion of a conversion operation, enables operation of the control circuit after operation of the A/D converter has been disabled, enables operation of the A/D converter to obtain an analog signal from the control circuit after operation of the control circuit has been enabled, and disables operation of the control circuit after enabling operation of the A/D converter to obtain the analog signal. The A/D converter converts the analog signal into a digital signal and the control processor analyzes the digital signal to determine if a short circuit condition exits in the control circuit. The control processor enables operation of the control circuit for a period that is less than an over current rating period of components of the control circuit, thereby insuring that the components of the control circuit will not be damaged if a short circuit condition exits.

US Patent:

55927548, Jan 14, 1997

Filed:

Jun 7, 1996

Appl. No.:

8/660521

Inventors:

Robert D. Krieder - Sullivan OH
Cheryl L. Greenly - Elyria OH

Assignee:

AlliedSignal Truck Brake Systems Co. - Elyria OH

International Classification:

F04B 4102
F04B 3906

US Classification:

34527

Abstract:

An electronically controlled compressed air system (10) includes an air dryer (16) which dries compressed air before the compressed air is communicated to a reservoir (26). The air dryer (16) includes a desiccant (18) which is purged by using air stored in the reservoir (26). A pressure transducer (13) is installed on the reservoir (26) and transits an electrical signal, indicative of the pressure in the reservoir (26) to an electric controller (11). Electric controller (11) transmits signals at various selected pressure levels to solenoid value (28) to control loading and unloading of the compressor (12), to solenoid valve (36) to control purging of the air dryer (16), and to the warning light (40) to alert an operator of a low air pressure condition. The valve (36) is operated to permit purging only when the compressor (12) is unloaded and only until a reservoir pressure is reached which is a predetermined pressure drop below the reference pressure level at which the compressor (12) is unloaded, whereupon purging is terminated.

US Patent:

59457430, Aug 31, 1999

Filed:

Apr 2, 1997

Appl. No.:

8/825875

Inventors:

Tamas I. Pattantyus - Dallas TX
Cheryl L. Greenly - Elyria OH
Ronald E. Squires - Albion IN

Assignee:

AlliedSignal Truck Brake Systems Co. - Elyria OH

International Classification:

B60L 100

US Classification:

307 101

Abstract:

A supervisory circuit for an anti-lock brake system (ABS) unit. The circuit includes an independent internal voltage reference source that provides power to the circuit components. The circuit also includes an external power source monitor powered by the internal voltage reference source which inhibits the ABS unit when an external power source voltage exceeds a predetermined level. The circuit also includes a system voltage monitor powered by the internal voltage reference source that inhibits the ABS unit when a system voltage deviates from predetermined system voltage parameters. The circuit also includes an electronic control unit (ECU) monitor powered by the internal voltage reference source that monitors a periodic signal generated by an ECU and that inhibits the ABS unit if an ECU timing signal deviates from a predetermined threshold level. The supervisory circuit helps to prevent spurious operation of ABS modulators due to race conditions.