Device and method for controlling electric motor

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 10562563
APP PUB NO 20190256132A1
SERIAL NO

16404447

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Importance

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Abstract

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Provided is a control device 150 for an electric motor 140 which includes multiple energization systems each including an inverter and coils corresponding to different phases, and which generates a steering assist force in an electric power steering system. Control device 150 diagnoses whether any of inverters 1A and 1B fails, and, when either of the inverters is diagnosed as having failed, reduces the output ratio of the failing inverter to 0% while increasing the output ratio of the normally operating inverter to 100% so as to prevent a drop in the total output from all the inverters after the failure-positive diagnosis. If steering operation is performed after the failure-positive diagnosis, control device 150 performs overheat protection processing for gradually lowering the limit value for the total output from all the inverters in accordance with the sensed temperature of the normally operating inverter.

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Patent Owner(s)

Patent OwnerAddress
HITACHI AUTOMOTIVE SYSTEMS LTD2520 TAKABA HITACHINAKA-SHI IBARAKI 312-8503

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Iijima, Fumiya Isesaki, JP 5 6
Koseki, Tomonobu Isesaki, JP 33 148
Yatsugi, Tomishige Isesaki, JP 31 368

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