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:
Jul. 15, 2025
Filed:
Aug. 05, 2020
Hitachi Astemo, Ltd., Hitachinaka, JP;
Tadahiro Obara, Hitachinaka, JP;
Yawara Kato, Hitachinaka, JP;
HITACHI ASTEMO, LTD., Hitachinaka, JP;
Abstract
An EPS control apparatus () having two electrical systems connected to external power supplies (A,B) includes, in each electrical system, inverters (A,B) driving a motor (), control circuits (A,B) controlling the inverters, and negative connectors (A,B) connecting control system negative lines (A,B) from a control system common ground () and drive system negative lines (A,B) with negative power supply lines (A,B). EPS control apparatus () also includes connection lines () connecting drive system negative lines (A,B) and a current state detection circuit () detecting current states of connection lines (). The control circuits detect open faults in connectors or negative power supply lines in their respective systems based on the current states. If an open fault is detected, the corresponding control circuit limits control on the inverter in its system. Otherwise, the control on the inverter in the system is continued.