Control device and failure determination method

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United States of America Patent

PATENT NO 11777429
SERIAL NO

17603706

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Abstract

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A failure phase of an AC current sensor is determined without providing a DC current sensor. A control device that controls a motor via an inverter circuit that supplies power converted from direct current to three-phase alternating current to the motor, in which a current sensor that detects alternating current of each phase of three-phase alternating current is provided at an output of the inverter circuit, and the control device calculates estimated DC current values by using a duty value of a PWM signal for controlling switching of the inverter circuit and an AC current value of two phases among three phases detected by the current sensor, and determines a failure of the current sensor on the basis of a change in the estimated DC current values that have been calculated.

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Patent Owner(s)

  • HITACHI ASTEMO, LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hayasaka, Keisuke Ibaraki, JP 1 0
Inada, Ryoichi Ibaraki, JP 10 90
Shigeta, Satoru Ibaraki, JP 23 232

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