Title:
METHOD AND APPARATUS FOR TORQUE LINEARIZATION IN AN ELECTRIC POWER STEERING SYSTEM
Document Type and Number:
WIPO Patent Application WO2001020411
Kind Code:
A9
Abstract:
An embodiment of the invention is a method of controlling a motor(12) in an electric power steering system. The method includes obtaining a motor control signal (16) having an initial duty cycle and linearizing (3) the initial duty cycle to obtain a secondary duty cycle. An offset is added to the secondary duty cycle to obtain and adjusted duty cycle. The motor (12) is controlled using the adjusted duty cycle. An alternative embodiment is a torque linearization device (32) for linearizing torque produced by a motor (12) in response to a motor control signal (16) having an initial duty cycle. The torque linearization device (32) includes a comparator for receiving the initial duty cycle and comparing the initial duty cycle to a threshold. A linearization table converts the initial duty cycle to a linearized duty cycle. A selector receives the initial duty cycle and the linearized duty cycle and selects one of the initial duty cycle and the linearized duty cycle as a secondary duty cycle in response to the comparing.
Inventors:
MIR SAYEED A
SKELLENGER DENNIS B
SKELLENGER DENNIS B
Application Number:
PCT/US2000/023959
Publication Date:
September 12, 2002
Filing Date:
August 31, 2000
Export Citation:
Assignee:
DELPHI TECH INC (US)
International Classes:
B62D5/04; G05B11/28; (IPC1-7): G05B11/28
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