Methods and Apparatus for an Active Front Steering Actuator

An active front steering system includes a motor controller configured to compute a position error from a commanded position value and an actual position value, and then enter one of two modes-a commutation enable mode and a commutation freeze mode-depending upon the value of this position error. Th...

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Bibliographische Detailangaben
Hauptverfasser:	HALL WILLARD A, BOLIO ROBERT R, NAMUDURI CHANDRA S
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROL OR REGULATING SYSTEMS IN GENERAL CONTROLLING FUNCTIONAL ELEMENTS OF SUCH SYSTEMS LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS MOTOR VEHICLES PERFORMING OPERATIONS PHYSICS REGULATING TRAILERS TRANSPORTING
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Beschreibung
Zusammenfassung:	An active front steering system includes a motor controller configured to compute a position error from a commanded position value and an actual position value, and then enter one of two modes-a commutation enable mode and a commutation freeze mode-depending upon the value of this position error. The commutation freeze mode applies when the absolute value of the position error is less than a predetermined threshold, and involves sending a set of signals to the motor's phase inputs such that commutation of the motor is prevented and a substantially constant motor hold torque is produced. The commutation enable mode applies when the absolute value of the position error is greater than or equal to the predetermined threshold, and corresponds to normal commutating operating mode.