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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.:

US 8880261 B1

PDFFull Text
Date of Patent:
Nov. 04, 2014

Filed:

Jul. 29, 2011

Electrically driven vehicle

Applicants:

Hiroyuki Kobayashi, Mito, JP;

Akira Kikuchi, Hitachi, JP;

Tomohiko Yasuda, Kashiwa, JP;

Takayuki Satou, Kashiwa, JP;

Kichio Nakajima, Kasumigaura, JP;

Inventors:

Hiroyuki Kobayashi, Mito, JP;

Akira Kikuchi, Hitachi, JP;

Tomohiko Yasuda, Kashiwa, JP;

Takayuki Satou, Kashiwa, JP;

Kichio Nakajima, Kasumigaura, JP;

Assignee:

Hitachi Construction Machinery Co., Ltd., Tokyo, JP;

Attorney:

Antonelli, Terry, Stout & Kraus, LLP.

Primary Examiner:

Thomas G Black

Assistant Examiner:

Tyler Paige

Int. Cl.
CPC ...
B60L 9/00 (2006.01); E21B 7/04 (2006.01); G01V 3/00 (2006.01); B60L 15/20 (2006.01); B60T 8/1761 (2006.01); B60K 28/16 (2006.01); G06F 17/00 (2006.01); B60K 7/00 (2006.01);
U.S. Cl.
CPC ...
G06F 17/00 (2013.01); B60T 2201/04 (2013.01); B60W 2520/263 (2013.01); B60L 15/20 (2013.01); B60K 2007/0061 (2013.01); B60W 2520/28 (2013.01); B60T 8/17616 (2013.01); Y02T 10/648 (2013.01); B60K 7/0007 (2013.01); Y02T 10/646 (2013.01); B60K 28/16 (2013.01);
Abstract

An electrically driven vehicle equipped with electric motors () for driving or braking drive wheels (), and an electric motor controller () for controlling the electric motors includes: wheel speed detectors (to) for detecting the wheel speed of the drive wheels and that of idler wheels (); computing means (toto) for computing the slip ratio of the drive wheels based on the wheel speed of the drive wheels and that of the idler wheels; and a determiner () for determining that the drive wheels are slipping if the slip ratio exceeds a slip ratio determination value. If the wheel speed of the idler wheels is lower than set speeds Va, Vb, then the determiner () changes the slip ratio determination value to a value having as the same sign as, and a larger absolute value than, the values λa, λbused when the wheel speed of the idler wheels is higher than the set speeds Va, Vb. This structure shortens acceleration time during acceleration traveling and reduces braking distance during deceleration traveling while inhibiting vibrations of the electrically driven vehicle.

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