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:
Nov. 18, 2008
Filed:
Apr. 01, 2005
Takafumi Maruyama, Tokyo, JP;
Hideto Negoro, Tokyo, JP;
Takafumi Maruyama, Tokyo, JP;
Hideto Negoro, Tokyo, JP;
Mitsubishi Electric Corporation, Chiyoda-Ku, Tokyo, JP;
Abstract
An object of the present invention is to provide an electric vehicle control device which is capable of detecting even a state in which only one phase of one induction motor is disconnected in a system where a plurality of induction motors are connected in parallel with each other and driven by one vector-controlled inverter device. The electric vehicle control device according to the present invention includes a torque calculation unit () for calculating the torque of the induction motor on the basis of a q-axis current I1q, a d-axis current I1d, a q-axis voltage command E1qr, a d-axis voltage command E1dr, and an inverter angular frequency ωinv, which are obtained by a vector control unit (), a torque variation width calculation unit () that calculates the torque variation width from a maximum value and a minimum value of a torque calculation result in a predetermined time width on the basis of the torque calculation result, and a comparator () that outputs a disconnection detection signal when the torque variation width exceeds the torque variation width reference value.