ROBERT J PETERSON
Real Estate Commission in Pittsburgh, PA

5355060, Oct 11, 1994

Aug 14, 1992

7/867098

Robert S. Peterson - Pittsburgh PA

AEG Automation Systems Corporation - Pittsburgh PA

H02P 500

318432

An impact load controller (28) compensates for the speed drop of a drive motor (12), which speed drop is caused by a load disturbance applied to the drive motor (12). A change in the dynamics of a speed controller (30, 34) in a speed regulator system for a stand in a tandem rolling mill is initiated by detecting a speed error (WE) which is greater than a predetermined speed error value and is removed after the speed error has been reduced to a predetermined value. The controller (28) is a pure rate controller whose input is converted into a rate change in speed error, which is multiplied by a gain factor. The resultant gain value product is initially increased by a predetermined factor to provide a high input signal to the (PI) speed controller (34) of a multi-loop speed regulator system for the drive motor (12), and to precharge a low pass filter. Thereafter, the output of the impact load controller (28) is a function of the time constant of the low pass filter; whereby the product gain consisting of the rate of change in speed error decays exponentially. The load impact controller (28) can be either a microprocessor type of control arrangement or an analog type of control arrangement.

5332180, Jul 26, 1994

Dec 28, 1992

7/997603

Robert A. Peterson - Pittsburgh PA
Theo C. Giras - Harmanville PA
Larry C. Mackey - Unity Township, Westmoreland County PA
Daniel R. Disk - Murrysville PA
Robert G. Brown - Hillpoint WI
Barry W. Johnson - Charlottesville VA
Joseph A. Profeta - Pittsburgh PA

Union Switch & Signal Inc. - Pittsburgh PA

G08G 100

246 3

A railway traffic control system in which accurate vehicle information is effectively available in real-time to facilitate control of traffic flow. Unlike prior art methods of precisely monitoring train location, the current invention is dependant only on equipment on-board the vehicle and position updates provided by external benchmarks located along the track route. The system's dynamic motion capabilities can also be used to sense and store track rail signatures, as a function of rail distance, which can be routinely analyzed to assist in determining rail and road-bed conditions for preventative maintenance purposes. In presently preferred embodiments, the on-board vehicle information detection equipment comprises an inertial measurement unit providing dynamic vehicle motion information to a position processor. Depending on the amount and quality of apriori knowledge of the vehicle route, the inertial measurement unit may have as many as three gyroscopes and three accelerometers or as little as a single accelerometer. To minimize error between benchmarks, the processor preferably includes a recursire estimation filter to combine the apriori route information with movement attributes derived from the inertial measurement unit.

5451846, Sep 19, 1995

Dec 14, 1993

8/166743

Robert S. Peterson - Pittsburgh PA
John W. Kane - Pittsburgh PA

AEG Automation Systems Corporation - Oakdale PA

H02P 1320

318254

A control system for energizing a direct current (DC) motor with alternating current (AC) power includes a first voltage sensor for a peak voltage of AC power; a second voltage sensor for a counter electromotive force (EMF) of the motor; a current sensor for an armature current of the motor; a digital processor having a first current controller responding to sensed armature current and a current reference, a cooperating second current controller responding to sensed peak voltage, sensed counter EMF and the current reference signal, and a gating circuit responding to the controllers; and a thyristor converter circuit sequentially gating portions of half cycles of AC power to the motor in response to firing signals from the gating circuit. The controllers may control a gate angle of the firing signals, the control system may include a third voltage sensor for a terminal voltage of the motor, and the armature current may have discontinuous and continuous waveforms. The processor may calculate a start of continuous current value which is a function of a calculated peak voltage of the AC power and a calculated counter EMF of the motor.

6843125, Jan 18, 2005

Jan 8, 2002

10/042545

Robert Peterson - Pittsburgh PA, US
James C. Hobson - West Bloomfield MI, US
Mikhail V. Novikov - Oakmont PA, US

G01D 542

73379, 73375, 73497, 73119 R, 33543

An apparatus for producing one or more characterizing measurements of a surface in relation to a repeatedly reproducible datum axis A-A, the apparatus comprising a probe a first porous surface located on the probe the first porous surface being in communication with a first source of fluid pressure the first porous surface being located proximate to opposing walls that defines a volume so that a non-contacting fluid pressure gap is formed between the first porous surface and the walls the first porous surface defining the datum axis A-A; at least one second porous surface located on the probe the at least one second porous surface being in communication with a second source of fluid pressure the at least one second porous surface being located in a cooperative relationship with the surface to be measured, so that a non-contacting fluid pressure gap is fanned between the at least one second porous surface and the surface to be measured; and means for generating one or more characterizing measurements of the surface to be measured in relation to the datum axis.

5134404, Jul 28, 1992

Apr 1, 1991

7/678682

Robert A. Peterson - Pittsburgh PA

Aerotech, Inc. - Pittsburgh PA

H03M 164

341116

A method of correcting quadrature signal errors comprises the steps for generating an error function signal E by summing the squares of the quadrature signals and subtracting a constant K therefrom, saving the value of the error function E at. theta. equals approximately 0,. pi. /2,. pi. , and 3. pi. /2, using the saved values of the error function to generate signals indicative of the quadrature errors, and generating corrected quadrature signals by processing the quadrature signals to eliminate the errors.

5321343, Jun 14, 1994

Feb 16, 1993

8/017804

John W. Kane - Pittsburgh PA
William S. Oleyar - White Oak PA
Robert S. Peterson - Pittsburgh PA

AEG Automation Systems Corporation - Pittsburgh PA

H02P 1320

318254

A control system for one or more dc motors in which thyristor power modules selectively gate portions of half cycles of ac voltage to the motor field and armature windings, has digitally implemented parallel inner control loops for the armature which each generate an intermediate control signal to which proportional plus derivative control action has been applied. Logic selects the intermediate control signal which phases back firing pulses for the thyristor power modules the most for application to a common digital integrator which produces a control signal having proportional plus integral control action. The voltage across each of the thyristors is monitored and used to detect continuous and discontinuous current operation for adjusting integrator gain.