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:
Jun. 27, 2017
Filed:
Dec. 22, 2015
Ntn Corporation, Osaka, JP;
NTN CORPORATION, Osaka, JP;
Abstract
A slip control device for an electric vehicle which accurately determines slippage occurrence with only a rotation angle sensor for motor rotation control and perform rapid control to eliminate the slippage, is provided. A threshold calculation module () calculates a normal angular acceleration of a motor depending on a manipulation amount of an accelerator to obtain a threshold, and an angular acceleration calculator () differentiates a detection value from a rotation angle sensor () twice to calculate an angular acceleration. A slip determination () determines whether a drive wheel () has slipped, and a torque limitation () limits a torque when a slippage has occurred. The determination () determines the angular acceleration and a threshold. The determination () counts a number of consecutive times it is determined that the threshold is exceeded, and determines that a slippage has occurred, if the number of consecutive times has reached a set value. The limitation () limits a torque developed by a motor unit for a drive wheel laterally opposite to the drive wheel determined as having slipped.