1
Steven James Collier Hallman, Ashok Chandy: Electric power steering control with torque ripple and road disturbance damper. Delphi Technologies, Edmond P Anderson, September 19, 2000: US06122579 (46 worldwide citation)

An electric power steering control for a motor vehicle reduces motor torque ripple and road generated disturbances communicated to the vehicle handwheel while promoting system stability. In deriving an output command torque signal to the EPS motor, the control (1) derives an electric motor speed sig ...


2
Steven James Collier Hallman: Electro-hydraulic power steering control with fluid temperature and motor speed compensation of power steering load signal. General Motors Corporation, Edmund P Anderson, July 25, 2000: US06092618 (40 worldwide citation)

A vehicle power steering system uses an electric motor to drive a pump at a variable speed to provide power steering fluid at a variable flow for power assist to operator steering efforts. The system has a speed control for the electric motor which derives a command speed signal from an input load s ...


3
Steven James Collier Hallman, Julie Ann Kleinau, Dennis B Skellenger: Brushless DC motor control method and apparatus for reduced commutation noise. General Motors Corporation, Edmund P Anderson, December 14, 1999: US06002226 (38 worldwide citation)

A brushless DC motor modifies motor commutation events to reduce noise by providing overlapping activation of the switch being deactivated with the switch being newly activated so that three switches are temporarily activated. The newly activated switch is pulse width modulated with a motor torque c ...


4
Tomy Sebastian, Steven James Collier Hallman: Brushless DC motor having reduced torque ripple for electric power steering. General Motors Corporation, Robert M Sigler, Edmund P Anderson, November 9, 1999: US05982067 (29 worldwide citation)

A brushless DC motor has a permanent magnet rotor comprising p magnetic poles and a stator having an integer multiple of 6*p*n slots containing windings, n being a positive, non-zero integer, and the poles and slots being skewed by one slot pitch with respect to each other. The windings in the slots ...


5
Timothy Wesley Kaufmann, Ashok Chandy, Steven James Collier Hallman: Electric power steering control. General Motors Corporation, Anthony Luke Simon, September 16, 1997: US05668722 (27 worldwide citation)

An electric power steering control apparatus comprising a torque sensor coupled to a vehicle steering system for measuring steering wheel torque provided by a vehicle operator, a steering angle sensor coupled to the steering system for measuring steering wheel angle, a controller, responsive to the ...


6
Steven James Collier Hallman: Transient compensation voltage estimation for feedforward sinusoidal brushless motor control. Delphi Technologies, Michael D Smith, January 2, 2007: US07157878 (21 worldwide citation)

A method for controlling a voltage mode controlled electric machine comprising: receiving a torque value representative of a desired torque; obtaining a speed value indicative of a rotational velocity of the electric machine; acquiring a phase advance value indicative of a desired phase advance angl ...


7
Steven James Collier Hallman: Electro-hydraulic power steering control with motor speed switching and fluid temperature compensation of standby switch-points. General Motors Corporation, Robert M Sigler, October 19, 1999: US05967253 (21 worldwide citation)

A vehicle power steering system uses an electric motor to drive a pump at a variable speed to provide power steering fluid at a variable flow for power assist to operator steering efforts. The system has a speed control for the electric motor which derives a command speed signal from a power steerin ...


8
Eugene Thomas Tanke II, Ashok Chandy, Julie Ann Kleinau, Steven James Collier Hallman: End-of-travel impact management system. Delphi Technologies, Edmund P Anderson, June 18, 2002: US06408235 (20 worldwide citation)

A system and method for controlling the collisions between elements of an automotive rack and pinion steering apparatus and an end-of-travel stop is presented. The system comprises a sensor for sensing a set of dynamic variables of the rack and pinion steering apparatus and operative thereby to gene ...


9
Julie Ann Kleinau, Steven James Collier Hallman, Dennis B Skellenger: Apparatus and method for commutation noise reduction. Delphi Technologies, Edmund P Anderson, September 10, 2002: US06448724 (19 worldwide citation)

A brushless DC motor modifies motor commutation events to reduce noise by providing overlapping activation of the switch being deactivated with the switch being newly activated so that three switches are temporarily activated. The newly activated switch is pulse width modulated with a motor torque c ...


10
Steven James Collier Hallman, William J Bressette: Tachometer apparatus and method for motor velocity measurement. Delphi Technologies, Edmund P Anderson, December 24, 2002: US06498409 (14 worldwide citation)

A method and apparatus for determining the velocity of a rotating device is described herein. The apparatus includes sets of sense magnets affixed to a rotating shaft of a rotating device and a circuit assembly. The circuit assembly includes a circuit interconnection having sense coils and sensors a ...