John K Ho

US Patent:

59496770, Sep 7, 1999

Filed:

Jan 9, 1997

Appl. No.:

8/780906

Inventors:

John K. Ho - Scottsdale AZ

Assignee:

Honeywell Inc. - Minneapolis MN

International Classification:

G05B 902
G05B 1101
G05B 1304
G06F 1100

US Classification:

364185

Abstract:

A control architecture having improved fault detection and correction capabilities is disclosed. The system comprises primary and monitor control systems, each having an associated control signal. A fault detector generates an alarm signal based upon differences observed between the primary and monitor control signal. The detector comprises an integrator and a memory means, and alarm signals are generated based upon the total amount of difference observed over a predetermined period of time. In one embodiment of the invention, primary and monitor control signals are averaged to provide a signal that is more fault tolerant than the individual control signals.

US Patent:

59019271, May 11, 1999

Filed:

Jul 18, 1996

Appl. No.:

8/683492

Inventors:

John Koon-Hung Ho - Scottsdale AZ

Assignee:

Honeywell Inc. - Minneapolis MN

International Classification:

B64C13/18

US Classification:

244183

Abstract:

A method and apparatus for use with an aircraft autopilot to prevent an aircraft part from striking the ground during near ground maneuvers by employing a protection circuit between the outer loop and the inner loop of the control chain between the autopilot and the control surface, the prevention circuit producing an output signal when there is a possibility of ground strike which output signal operates to reduce the control surface command signal from the inner loop to the control surface and thus be rapidly responsive to aircraft attitude changes that could produce ground strike.