Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1996-09-20
1999-12-28
Martin, David
Electricity: motive power systems
Switched reluctance motor commutation control
318701, 318599, 180446, 388811, H02K 2300
Patent
active
060085991
ABSTRACT:
An apparatus for controlling an electric assist steering system (10) having an electric assist motor (26) operatively connected to a steerable member. Energization of the motor provides steering assist to the steering member. The apparatus includes a steering torque sensor (27) for sensing applied steering torque and providing a torque signal indicative thereof. A first switching device (72) is operative coupled between one terminal of the electric assist motor (26) and a first terminal of a source of electrical energy. A second switching device (98) is operative coupled between a second terminal of the electric assist motor and a second terminal of the source of electrical energy. A controller (76) periodically switches the first and second switching devices between ON and OFF conditions so that the ON condition of each the first and second switching devices is less than one-hundred percent of a period and a portion of the ON condition of the first and second switching devices overlap. Electrical current flows through the electric assist motor (26) during an overlap portion of ON conditions. The amount of the overlap controls current in the electric assist motor. The controller (76) controls the overlap in response to the sensed applied steering torque.
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An abstract of Japanese Application No. JP 2095976 dated Apr. 6, 1990.
Martin David
TRW Inc.
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