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HYDRAULIC CONTROL CIRCUIT FOR WORK MACHINE
To attain reduction of fuel consumption and improvement of operability and to accurately perform pump pressure control through opening area control of a bypass valve regardless of a condition at every control in a hydraulic control circuit comprising a bypass oil path which is formed while being branched from a discharge line of a hydraulic pump and reaches an oil tank, and the bypass valve of which the opening area is variable so as to control a flow rate of the bypass oil path.SOLUTION: When non-manipulating a manipulator 7, closed loop control is performed on an opening area of a bypass valve 11 in such a manner that a pump pressure is maintained at a preset pressure. When manipulating the manipulator 7, on the other hand, open loop control is performed to decrease the opening area of the bypass valve 11 in accordance with a manipulated variable of the manipulator. A correspondence between the manipulated variable of the manipulator in the open loop control and the opening area of the bypass valve 11 is corrected based on the opening area of the bypass valve 11 during the closed loop control.SELECTED DRAWING: Figure 5
【課題】油圧ポンプの吐出ラインから分岐形成されて油タンクに至るバイパス油路と、該バイパス油路の流量を制御するべく開口面積可変なバイパス弁が設けられた油圧制御回路において、低燃費化、操作性の向上を図るとともに、バイパス弁の開口面積制御によるポンプ圧制御を、都度の条件に左右されることなく精度良く行えるようにする。【解決手段】操作具７の非操作時には、ポンプ圧が設定圧に保持されるようにバイパス弁１１の開口面積をクローズドループ制御する一方、操作具７の操作時には、操作具操作量に応じてパイパス弁１１の開口面積を減少させるオープンループ制御を行う構成にするとともに、オープンループ制御における操作具操作量とバイパス弁１１の開口面積との対応関係を、クローズドループ制御時のバイパス弁１１の開口面積に基づいて補正する構成にした。【選択図】図５
HYDRAULIC CONTROL CIRCUIT FOR WORK MACHINE
To attain reduction of fuel consumption and improvement of operability and to accurately perform pump pressure control through opening area control of a bypass valve regardless of a condition at every control in a hydraulic control circuit comprising a bypass oil path which is formed while being branched from a discharge line of a hydraulic pump and reaches an oil tank, and the bypass valve of which the opening area is variable so as to control a flow rate of the bypass oil path.SOLUTION: When non-manipulating a manipulator 7, closed loop control is performed on an opening area of a bypass valve 11 in such a manner that a pump pressure is maintained at a preset pressure. When manipulating the manipulator 7, on the other hand, open loop control is performed to decrease the opening area of the bypass valve 11 in accordance with a manipulated variable of the manipulator. A correspondence between the manipulated variable of the manipulator in the open loop control and the opening area of the bypass valve 11 is corrected based on the opening area of the bypass valve 11 during the closed loop control.SELECTED DRAWING: Figure 5
【課題】油圧ポンプの吐出ラインから分岐形成されて油タンクに至るバイパス油路と、該バイパス油路の流量を制御するべく開口面積可変なバイパス弁が設けられた油圧制御回路において、低燃費化、操作性の向上を図るとともに、バイパス弁の開口面積制御によるポンプ圧制御を、都度の条件に左右されることなく精度良く行えるようにする。【解決手段】操作具７の非操作時には、ポンプ圧が設定圧に保持されるようにバイパス弁１１の開口面積をクローズドループ制御する一方、操作具７の操作時には、操作具操作量に応じてパイパス弁１１の開口面積を減少させるオープンループ制御を行う構成にするとともに、オープンループ制御における操作具操作量とバイパス弁１１の開口面積との対応関係を、クローズドループ制御時のバイパス弁１１の開口面積に基づいて補正する構成にした。【選択図】図５
HYDRAULIC CONTROL CIRCUIT FOR WORK MACHINE
作業機械の油圧制御回路
NAKAJIMA HIDEKI (author)
2020-08-31
Patent
Electronic Resource
Japanese