Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
ELECTRIC HYDRAULIC SHOVEL
To provide an electric hydraulic shovel capable of surely preventing damage of a motor when a load of the motor for driving a hydraulic pump surges due to the increase in a discharge amount of the hydraulic pump of HST in an extremely cold environment.SOLUTION: In a normal temperature range, a pump discharge amount V2 is calculated from a pump discharge pressure according to a characteristic line Ln of a normal limit mode, and a pump discharge pressure V1 acquired according to a lever operation is limited with the pump discharge amount V2 being the upper limit. Thereby, an overload of an HST system is prevented. On a lower load side than the characteristic line Ln of the normal limit mode, characteristic lines L1-L3 of first to third cold limit modes are added. In an extremely cold environment, on the basis of the characteristic lines L1-L3 of the cold limit mode selected according to a motor temperature Tm, when the temperature is lower, the lower pump discharge amount V2 is calculated to greatly limit the pump discharge amount V1, and the load on a motor 27 for driving a hydraulic pump 28 is suppressed to prevent damage.SELECTED DRAWING: Figure 7
【課題】極寒環境でのＨＳＴの油圧ポンプの吐出量の増加により油圧ポンプを駆動するモータの負荷が急増したときのモータ破損を確実に防止できる電動油圧ショベルを提供する。【解決手段】通常の温度域では、ノーマル制限モードの特性線Ｌnに従ってポンプ吐出圧からポンプ吐出量Ｖ2を算出し、このポンプ吐出量Ｖ2を上限として、レバー操作に応じて求めたポンプ吐出圧Ｖ1を制限することにより、ＨＳＴシステムの過負荷の防止を図る。ノーマル制限モードの特性線Ｌnよりも低負荷側に、第１〜３冷態制限モードの特性線Ｌ1〜Ｌ3を追加しておく。極寒環境では、モータ温度Ｔmに応じて選択した冷態制限モードの特性線Ｌ1〜Ｌ3に基づき、低温ほど低いポンプ吐出量Ｖ2を算出してポンプ吐出量Ｖ1を大きく制限し、油圧ポンプ２８を駆動するモータ２７の負荷を抑制して破損を防止する。【選択図】図７
ELECTRIC HYDRAULIC SHOVEL
To provide an electric hydraulic shovel capable of surely preventing damage of a motor when a load of the motor for driving a hydraulic pump surges due to the increase in a discharge amount of the hydraulic pump of HST in an extremely cold environment.SOLUTION: In a normal temperature range, a pump discharge amount V2 is calculated from a pump discharge pressure according to a characteristic line Ln of a normal limit mode, and a pump discharge pressure V1 acquired according to a lever operation is limited with the pump discharge amount V2 being the upper limit. Thereby, an overload of an HST system is prevented. On a lower load side than the characteristic line Ln of the normal limit mode, characteristic lines L1-L3 of first to third cold limit modes are added. In an extremely cold environment, on the basis of the characteristic lines L1-L3 of the cold limit mode selected according to a motor temperature Tm, when the temperature is lower, the lower pump discharge amount V2 is calculated to greatly limit the pump discharge amount V1, and the load on a motor 27 for driving a hydraulic pump 28 is suppressed to prevent damage.SELECTED DRAWING: Figure 7
【課題】極寒環境でのＨＳＴの油圧ポンプの吐出量の増加により油圧ポンプを駆動するモータの負荷が急増したときのモータ破損を確実に防止できる電動油圧ショベルを提供する。【解決手段】通常の温度域では、ノーマル制限モードの特性線Ｌnに従ってポンプ吐出圧からポンプ吐出量Ｖ2を算出し、このポンプ吐出量Ｖ2を上限として、レバー操作に応じて求めたポンプ吐出圧Ｖ1を制限することにより、ＨＳＴシステムの過負荷の防止を図る。ノーマル制限モードの特性線Ｌnよりも低負荷側に、第１〜３冷態制限モードの特性線Ｌ1〜Ｌ3を追加しておく。極寒環境では、モータ温度Ｔmに応じて選択した冷態制限モードの特性線Ｌ1〜Ｌ3に基づき、低温ほど低いポンプ吐出量Ｖ2を算出してポンプ吐出量Ｖ1を大きく制限し、油圧ポンプ２８を駆動するモータ２７の負荷を抑制して破損を防止する。【選択図】図７
ELECTRIC HYDRAULIC SHOVEL
電動油圧ショベル
TAKAYAMA SHIGEKI (Autor:in) / YAMAKAWA TAKAYUKI (Autor:in)
28.03.2019
Patent
Elektronische Ressource
Japanisch
IPC:
E02F
Baggern
,
DREDGING
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