Douglas Daniel Cameron

US Patent:

7142971, Nov 28, 2006

Filed:

Feb 19, 2003

Appl. No.:

10/369285

Inventors:

Eric D. Brown - Huntington Beach CA, US
Douglas C. Cameron - Seal Beach CA, US
Krish R. Krothapalli - Redondo Beach CA, US
Todd M. Williams - Long Beach CA, US

Assignee:

The Boeing Company - Chicago IL

International Classification:

G06F 19/00

US Classification:

701110, 701 23, 701 25, 701 26, 244183

Abstract:

The method and system for automatically controlling a path of travel of a vehicle include engaging an automatic control system when the security of the onboard controls is jeopardized. Engagement may be automatic or manual from inside the vehicle or remotely via a communication link. Any onboard capability to supersede the automatic control system may then be disabled by disconnecting the onboard controls and/or providing uninterruptible power to the automatic control system via a path that does not include the onboard accessible power control element(s). The operation of the vehicle is then controlled via the processing element of the automatic control system. The control commands may be received from a remote location and/or from predetermined control commands that are stored onboard the vehicle.

US Patent:

20070235592, Oct 11, 2007

Filed:

Dec 5, 2006

Appl. No.:

11/633910

Inventors:

Phillippe Horn - Long Beach CA, US
Douglas Cameron - Seal Beach CA, US
Tony Lytle - Huntington Beach CA, US
Eric Brown - Huntington Beach CA, US

International Classification:

B64G 1/00

US Classification:

244158100

Abstract:

A method and apparatus for separating a first spacecraft from a rotating second spacecraft within a separation corridor having a trailing boundary surface is disclosed. The method and apparatus use a non-stationkeeping trajectory that uses a greater portion of the separation corridor to reduce thrust requirements and reduce the time necessary for separation.

US Patent:

20120078446, Mar 29, 2012

Filed:

Sep 28, 2010

Appl. No.:

12/892853

Inventors:

Douglas C. Cameron - Ladera Ranch CA, US

Assignee:

THE BOEING COMPANY - Chicago IL

International Classification:

G05D 1/00

US Classification:

701 3

Abstract:

Presented is a system and method for controlling an actuator in a multirate control system using an integrated upsampler and filter, comprising an incremental command limiter for changing a command from a first control system into a limited incremental command in a second control system, a lead-lag filter for filtering the limited incremental command to attenuate high frequencies, and a feed forward path for reducing phase loss in rate output signal at low frequencies. In embodiments, a command position signal received at the sampling rate of the first control system is interpolated into incremental command position signals at the sampling rate of the second control system. Position error signals and rate error signals from the devices being controlled are used as feedback to further stability the control loops.

US Patent:

20170324362, Nov 9, 2017

Filed:

May 6, 2016

Appl. No.:

15/148562

Inventors:

- Chicago IL, US
Douglas Conrad Cameron - Ladera Ranch CA, US

International Classification:

H02P 23/14
H02P 23/00

Abstract:

A method and apparatus for controlling regeneration for a motor. An instantaneous voltage provided by a power supply to the motor is identified using a voltage signal received from a voltage sensor. A new average voltage is computed for the motor using the instantaneous voltage, a previously computed average voltage, and a weight factor for the instantaneous voltage. A difference between the new average voltage and the instantaneous voltage is compared to a selected threshold to determine whether a regeneration condition exists. Operation of the motor is controlled such that a duty cycle of the motor does not decrease in response to a determination that the regeneration condition exists.

US Patent:

20160154384, Jun 2, 2016

Filed:

Feb 17, 2014

Appl. No.:

14/182151

Inventors:

- Chicago IL, US
Douglas C. Cameron - Ladera Ranch CA, US

Assignee:

The Boeing Company - Chicago IL

International Classification:

G05B 6/02
B64C 19/00

Abstract:

A multi-rate system for controlling an actuator may include an incremental command limiter that receives a command from a first control system and outputs a limited incremental command; a feed-forward that receives the limited incremental command from the incremental command limiter and outputs a feed forward rate command; a first differentiator that limits the limited incremental command to a maximum allowable command; an upsampler state that outputs a current state back to the differentiator; a first summer that receives the limited incremental command and the current state from the upsampler state, and outputs an incremental position command; and a second summer that combines the incremental position command and the feed forward rate command to produce a rate error output signal.

US Patent:

20160032866, Feb 4, 2016

Filed:

Jul 30, 2014

Appl. No.:

14/447310

Inventors:

- Chicago IL, US
Douglas C. Cameron - Ladera Ranch CA, US

International Classification:

F02K 1/76
F02K 1/56

Abstract:

Thrust reverser actuator systems are disclosed herein. An example apparatus disclosed herein includes a first controller to communicate with a first flight computer and a second flight computer of an aircraft. The example apparatus also includes a second controller to communicate with the first flight computer and the second flight computer. The example apparatus further includes a thrust reverser and a first electrical actuator coupled to the thrust reverser. The first electrical actuator is to be communicatively coupled to the first controller and the second controller. The example apparatus also includes a second electrical actuator coupled to the thrust reverser. The second electrical actuator is to be communicatively coupled to the second controller. The first electrical actuator and the second electrical actuator are to synchronously actuate the thrust reverser.

US Patent:

20150326154, Nov 12, 2015

Filed:

Jul 16, 2015

Appl. No.:

14/801398

Inventors:

- Chicago IL, US
Douglas C. Cameron - Ladera Ranch CA, US

International Classification:

H02P 6/00
H02P 23/14

Abstract:

A method and apparatus for controlling a motor. The motor comprises windings. A switch bridge comprising a plurality of switches is configured to couple a power source to the windings. A motor controller is configured to control the plurality of switches. An undesired condition identifier is configured to identify an undesired condition when the motor is providing power to the power source, wherein the undesired condition is defined with respect to a characteristic of the power source. An undesired condition reducer is configured to reduce the undesired condition in response to identifying the undesired condition by the undesired condition identifier.

US Patent:

20150084558, Mar 26, 2015

Filed:

Sep 26, 2013

Appl. No.:

14/037846

Inventors:

- Chicago IL, US
Douglas C. Cameron - Ladera Ranch CA, US

Assignee:

THE BOEING COMPANY - Chicago IL

International Classification:

H02P 6/18

US Classification:

31840013

Abstract:

A method and apparatus for controlling an electric motor. A controller is configured to identify a start time for a signal based on a back electromotive force present in an electric motor during operation of the electric motor. The start time is for a position of a rotor relative to a group of coils. The controller is further configured to send the signal to the group of coils using the start time identified. An effect of the back electromotive force on the signal is reduced.