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:
Mar. 26, 2024
Filed:
Dec. 12, 2019
Hitachi Astemo, Ltd., Hitachinaka, JP;
Hitachi Astemo, Ltd., Hitachinaka, JP;
Abstract
A first torque calculation unitcalculates torque TQ_DC currently generated by a motorbased on a DC current DC. A second torque calculation unitcalculates torque TQ_UVW currently generated by the motorbased on U-phase, V-phase, and W-phase currents. A torque limit calculation unitcalculates a torque limit TQ_LMTusing a torque limit characteristic map measured in advance based on a current limit DC_LMT. A torque limit correction unitcompares first torque TQ_DC with second torque TQ_UVW to calculate a torque variation degree KP. Then, the torque limit TQ_LMTis corrected using the variation degree KPto calculate a torque limit TQ_LMT. As a result, even if required torque reaches the torque limit, the DC current does not exceed the current limit, and the output of the motor can be fully utilized by approaching the current limit.