Title:
HYDRAULIC SYSTEM PUMP CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/096435
Kind Code:
A1
Abstract:
During swing start-up, a control operation for changing the maximum absorption torque of a second hydraulic pump to Tb or Tc according to the discharge pressure of the second hydraulic pump (3) is performed in a pump torque calculating unit (43) using discharge pressure, a pump torque calculating unit (44) using swing operating pressure, and a maximum value selecting section (45), of a controller (38). During a swing-combined operation where swing is combined with other actions, a calculation for subtracting the maximum absorption torque Tp2 of the second hydraulic pump (3) from the total pump torque Tr0 is performed in a subtraction section (47). Thereby a control operation is performed wherein the amount of the torque of the second hydraulic pump (3) by which a reduction is made is allocated to a first hydraulic pump (2) which pertains to actuators other than a swing motor (7). On account of the above, a reduction is made in energy loss due to pressure relief during swing start-up, resulting in increased energy efficiency. Furthermore, in a transition process to constant speed subsequent to swing start-up, a required flow rate is supplied to the swing motor, with the result that a constant speed swing state is smoothly reached, leading to operational efficiency and combined operability being improved.
Inventors:
OKANO Yasuo (Tsuchiura Works, Intellectual Property Department, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
岡野 康雄 (〒13 茨城県土浦市神立町６５０番地 日立建機株式会社土浦工場 知的財産部内 Ibaraki, 〒3000013, JP)
NAKAMURA Tsuyoshi (Tsuchiura Works, Intellectual Property Department, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
岡野 康雄 (〒13 茨城県土浦市神立町６５０番地 日立建機株式会社土浦工場 知的財産部内 Ibaraki, 〒3000013, JP)
NAKAMURA Tsuyoshi (Tsuchiura Works, Intellectual Property Department, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
Application Number:
JP2011/052150
Publication Date:
August 11, 2011
Filing Date:
February 02, 2011
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY CO., LTD. (5-1 Koraku 2-chome, Bunkyo-ku Tokyo, 63, 〒1128563, JP)
日立建機株式会社 (〒63 東京都文京区後楽二丁目５番１号 Tokyo, 〒1128563, JP)
OKANO Yasuo (Tsuchiura Works, Intellectual Property Department, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
岡野 康雄 (〒13 茨城県土浦市神立町６５０番地 日立建機株式会社土浦工場 知的財産部内 Ibaraki, 〒3000013, JP)
日立建機株式会社 (〒63 東京都文京区後楽二丁目５番１号 Tokyo, 〒1128563, JP)
OKANO Yasuo (Tsuchiura Works, Intellectual Property Department, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
岡野 康雄 (〒13 茨城県土浦市神立町６５０番地 日立建機株式会社土浦工場 知的財産部内 Ibaraki, 〒3000013, JP)
International Classes:
E02F9/22; F15B11/00; F15B11/17
Attorney, Agent or Firm:
KASUGA Yuzuru (Torii-nihonbashi Bldg, 4-1 Nihonbashi-honcho 3-chome, Chuo-k, Tokyo 23, 〒1030023, JP)
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Claims: