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:
Apr. 19, 2016
Filed:
Apr. 11, 2013
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Hiroyuki Kobayashi, Tokyo, JP;
Akira Kikuchi, Tokyo, JP;
Tomohiko Yasuda, Ibaraki, JP;
Takayuki Sato, Ibaraki, JP;
Shinjiro Saito, Tokyo, JP;
HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;
Abstract
Provided is an electric drive vehicle which can control wheel speed so as to achieve an appropriate slip ratio of the wheels even when pitching vibration of the vehicle is large. This electric drive vehicle is provided with electric motors (), drive wheels (), driven wheels (), an electric motor controller () for controlling the electric motors, and speed detectors (-) for detecting the wheel speed of the drive wheels and the driven wheels. The electric motor controller is provided with: a slip ratio calculation unit () which calculates the slip ratio of the drive wheels from the wheel speed detected values detected by the speed detectors; a torque command calculation unit () which calculates torque commands for the drive wheels; a drive force calculation unit () which, from the wheel speed detected values of the drive wheels and the torque commands of the drive wheels, calculates the drive force generated in the drive wheels; and filters () which reduce the pitching vibration frequency components of the vehicle included in the slip ratio and the drive force.