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:
Sep. 17, 2013
Filed:
Feb. 02, 2012
Takao Kojima, Hitachinaka, JP;
Atsushi Yokoyama, Hitachiota, JP;
Takao Kojima, Hitachinaka, JP;
Atsushi Yokoyama, Hitachiota, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A controller for vector-controlled motor of vehicle judges whether a battery needs to be warmed up in accordance with an output of a battery temperature sensor, and when the battery needs to be warmed up, in situation (i) where the vehicle is stopped, sets a q-axis current value of the motor at zero, or when a brake is released from the situation (i), sets a q-axis current at a value corresponding to a drive torque for a vehicle creep operation, and sets a d-axis current at a value for battery warm-up. When the battery needs to be warmed up in situation (ii) where the vehicle is running, the controller sets a q-axis current at a value corresponding to a drive torque of vehicle running and sets a d-axis current at a value for the battery warm-up in relation to the q-axis current value.