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. 05, 2000
Filed:
Jan. 25, 1999
Yasuo Matsunaga, Kanagawa, JP;
Norifumi Isaji, Kanagawa, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
In control apparatus and method for an electric vehicle, when the motor is determined to be locked during a run of the vehicle on an ascending slope, a limitation torque .tau.r of the motor as a function of a maximum value T.sub.JMAX of estimated junction temperatures of respective switching devices of an inverter circuit is determined, an output torque .tau.L for the motor to be escaped from the locked state is calculated as .tau.L=.tau..GAMMA.-.DELTA..tau., wherein .DELTA..tau. denotes a displacement torque, .DELTA..tau.=.DELTA..tau.+A when .tau.r<.tau.c and a phase domain of the motor determined on the basis of a magnetic pole position .theta. is the same as the previous one and .DELTA..tau.=0 when .tau.r.gtoreq..tau.c and the phase domain is not the same as the previous one.