The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 03, 2023
Filed:
Apr. 03, 2020
Hitachi Astemo, Ltd., Hitachinaka, JP;
Hitachi Astemo, Ltd., Hitachinaka, JP;
Abstract
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.