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Title:
HYDRAULIC EXCAVATOR, AND HYDRAULIC EXCAVATOR CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2011/145600
Kind Code:
A1
Abstract:
In a hydraulic excavator, a controller (40) controls the output of an engine (21) on the basis of a first engine output torque line (P1) which specifies the upper limit of engine output torque with respect to engine speed. The controller (40) determines which of the following operations is being performed: a high hydraulic pressure operation wherein a high hydraulic load is applied to a work machine (4); or a low hydraulic pressure operation wherein a low hydraulic load is applied to the work machine (4). Furthermore, when there is being performed a combined operation consisting of a low hydraulic load operation of the work machine (4) and an operation wherein a swing body (3) is swung, the controller (40) controls the output of the engine (21) on the basis of a second engine output torque line (E1). The second engine output torque line (E1) is an engine output torque line such that engine output torque is lower than the first engine output torque line (P1).

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Inventors:
OHHIGASHI, Kouji (3-1-1 Ueno, Hirakata-sh, Osaka 11, 〒5731011, JP)
大東　広治 (〒11 大阪府枚方市上野３－１－１　株式会社小松製作所　大阪工場内 Osaka, 〒5731011, JP)
KAMADO, Mitsuhiko (3-1-1 Ueno, Hirakata-sh, Osaka 11, 〒5731011, JP)
Application Number:
JP2011/061287
Publication Date:
November 24, 2011
Filing Date:
May 17, 2011
Export Citation:
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Assignee:
KOMATSU LTD. (2-3-6, Akasaka Minato-k, Tokyo 14, 〒1078414, JP)
株式会社小松製作所 (〒14 東京都港区赤坂２－３－６ Tokyo, 〒1078414, JP)
OHHIGASHI, Kouji (3-1-1 Ueno, Hirakata-sh, Osaka 11, 〒5731011, JP)
大東　広治 (〒11 大阪府枚方市上野３－１－１　株式会社小松製作所　大阪工場内 Osaka, 〒5731011, JP)
International Classes:
E02F9/20; F15B11/00
Attorney, Agent or Firm:
SHINJYU GLOBAL IP (South Forest Bldg, 1-4-19 Minamimori-machi, Kita-ku, Osaka-sh, Osaka 54, 〒5300054, JP)
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Claims:



 
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