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. 11, 2012
Filed:
May. 07, 2007
Yasuo Tanaka, Yokohama, JP;
Tomohiko Yasuda, Kashiwa, JP;
Takashi Yagyu, Ushiku, JP;
Yutaka Watanabe, Kasumigaura, JP;
Yasuo Tanaka, Yokohama, JP;
Tomohiko Yasuda, Kashiwa, JP;
Takashi Yagyu, Ushiku, JP;
Yutaka Watanabe, Kasumigaura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A drive system of an electrically driven dump truck is capable of achieving an operational feeling in which the operation amount of the accelerator pedal is well balanced with the output horsepower of the electric motors, particularly at the time of slow traveling. To achieve this, the target motor output horsepower Pmcorresponding to the operation amount of an accelerator pedalis calculated. The target motor torque TrR, TrL is calculated on the basis of the target motor output horsepower Pmand the rotational speed ωR, ωL of electric motorsR,L respectively. The acceleration torque limit values of the electric motorsR,L corresponding to the operation amount of the accelerator pedalare calculated, respectively. Then, smaller values are selected, as motor torque instruction values TrR, TrL, between the acceleration torque limit value and the target motor torque TrR, TrL to control invertersR,L, respectively.