A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
HYDRAULIC DRIVE UNIT OF CONSTRUCTION MACHINE
To stably perform the flow rate control of a hydraulic pump and the diversion control of a plurality of direction switching valves even if a before-and-after pressure difference of the direction switching valves associated with actuators is extremely small, to obtain excellent complex operability by preventing an abrupt change of a flow rate of hydraulic pressure supplied to the actuators even if a requirement flow rate is abruptly changed at transition or the like to a single operation from a complex operation, and to obtain high energy efficiency by reducing meter-in losses of the direction switching valves.SOLUTION: Requirement flow rates of direction switching valves 6a, 6b and 6c are calculated from input amounts of operation levers, openings of flow rate control valves 7a, 7b and 7c are controlled by using the requirement flow rates, meter-in pressure losses of the prescribed direction switching valves are calculated from the requirement flow rates of the direction switching valves 6a, 6b and 6c and meter-in opening areas, and the set pressure of an unload valve 15 is controlled by using the values.SELECTED DRAWING: Figure 1
【課題】各アクチュエータに関連付けられた方向切換弁の前後差圧が非常に小さい場合においても、油圧ポンプの流量制御と複数の方向切換弁の分流制御を安定的に行うことができ、複合動作から単独動作への移行時などに要求流量が急変した場合でも、各アクチュエータへ供給される圧油の流量が急激に変化することを防いて、優れた複合操作性を実現し、方向切換弁のメータイン損失を低減して高いエネルギー効率を実現する。【解決手段】各操作レバーの入力量から各方向切換弁６a，６b，６cの要求流量を算出し、その要求流量を用いて流量制御弁７a，７b，７cの開口を制御するとともに、各方向切換弁６a，６b，６cの要求流量とメータイン開口面積から所定の方向切換弁のメータイン圧損を算出し、アンロード弁１５のセット圧をその値を用いて制御する。【選択図】図１
HYDRAULIC DRIVE UNIT OF CONSTRUCTION MACHINE
To stably perform the flow rate control of a hydraulic pump and the diversion control of a plurality of direction switching valves even if a before-and-after pressure difference of the direction switching valves associated with actuators is extremely small, to obtain excellent complex operability by preventing an abrupt change of a flow rate of hydraulic pressure supplied to the actuators even if a requirement flow rate is abruptly changed at transition or the like to a single operation from a complex operation, and to obtain high energy efficiency by reducing meter-in losses of the direction switching valves.SOLUTION: Requirement flow rates of direction switching valves 6a, 6b and 6c are calculated from input amounts of operation levers, openings of flow rate control valves 7a, 7b and 7c are controlled by using the requirement flow rates, meter-in pressure losses of the prescribed direction switching valves are calculated from the requirement flow rates of the direction switching valves 6a, 6b and 6c and meter-in opening areas, and the set pressure of an unload valve 15 is controlled by using the values.SELECTED DRAWING: Figure 1
【課題】各アクチュエータに関連付けられた方向切換弁の前後差圧が非常に小さい場合においても、油圧ポンプの流量制御と複数の方向切換弁の分流制御を安定的に行うことができ、複合動作から単独動作への移行時などに要求流量が急変した場合でも、各アクチュエータへ供給される圧油の流量が急激に変化することを防いて、優れた複合操作性を実現し、方向切換弁のメータイン損失を低減して高いエネルギー効率を実現する。【解決手段】各操作レバーの入力量から各方向切換弁６a，６b，６cの要求流量を算出し、その要求流量を用いて流量制御弁７a，７b，７cの開口を制御するとともに、各方向切換弁６a，６b，６cの要求流量とメータイン開口面積から所定の方向切換弁のメータイン圧損を算出し、アンロード弁１５のセット圧をその値を用いて制御する。【選択図】図１
HYDRAULIC DRIVE UNIT OF CONSTRUCTION MACHINE
建設機械の油圧駆動装置
TAKAHASHI KIWAMU (author) / MAEHARA TAHEI (author) / ISHII TAKASHI (author)
2019-10-10
Patent
Electronic Resource
Japanese