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. 23, 2008
Filed:
Jan. 24, 2007
Satoru Kaneko, Naka, JP;
Tatsuyuki Yamamoto, Mito, JP;
Kenta Katsuhama, Hitachinaka, JP;
Shigeru Akaishi, Isesaki, JP;
Hisao Iino, Hitachinaka, JP;
Satoru Kaneko, Naka, JP;
Tatsuyuki Yamamoto, Mito, JP;
Kenta Katsuhama, Hitachinaka, JP;
Shigeru Akaishi, Isesaki, JP;
Hisao Iino, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention provides a controller and driving apparatus for an electric vehicle, which enables a motor to steadily output torque even when there is an increase in the rotation speed of an internal combustion engine that drives a generator. A motor control unit includes a voltage/current command generator F. The voltage/current command generator Fincludes a base command determination unit, which determines a base command value for the output voltage of the generator and base command values for d- and q-axis currents that drive an AC motor, and power generation operating point change means, which changes the command values that are output from the base command determination unit. When an operating point of the generator approaches an unstable region where the generator unsteadily operates, the power generation operating point change means changes the generator's operating point to position it within a stable region.