A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
ELECTRIC CONSTRUCTION MACHINE
To provide an electric construction machine which improves pump efficiency of a hydraulic pump when an electric motor drives a hydraulic pump, and can achieve energy saving without impairing original performance of a construction machine.SOLUTION: A pressure sensor 10 detects a pressure of pressure oil of a pressure oil supply path 5 as a discharge pressure of a pump device 1 composed of first and second pumps 1a and 1b, a vehicle body controller 20 drives at least the first pump 1a between the first and second pumps 1a and 1b when the discharge pressure is lower than PL (first threshold), drives only the second pump 1b when the discharge pressure is equal to or more than the PL, and controls the capacity of the first pump 1a and engine speeds of first and second electric motors 2a and 2b so as to perform such output restriction control to continuously decrease a discharge flow rate of the pump device 1 composed of the first and second pumps 1a and 1b as the discharge pressure is raised and so as to restrict output of the pump device 1 to a maximum output M or less, when the discharge pressure is equal to or more than PL0 (second threshold).SELECTED DRAWING: Figure 2
【課題】電動モータが油圧ポンプを駆動するときの油圧ポンプのポンプ効率を改善し、建設機械の本来の性能を損なうことなく、省エネルギー化を実現することできる電動式建設機械を提供する。【解決手段】圧力センサ１０は圧油供給路５の圧油の圧力を第１及び第２ポンプ１ａ，１ｂからなるポンプ装置１の吐出圧として検出し、車体コントローラ２０は、その吐出圧がＰL（第１閾値）よりも低いときは、第１及び第２ポンプ１ａ，１ｂのうち少なくとも第１ポンプ１ａを駆動し、吐出圧がＰL以上にあるときは、第２ポンプ１ｂのみを駆動し、吐出圧がＰL0（第２閾値）以上にあるときは、吐出圧が上昇するにしたがって第１及び第２ポンプ１ａ，１ｂからなるポンプ装置１の吐出流量が連続的に減少し、当該ポンプ装置１の出力を最大出力Ｍ以下に制限する出力制限制御を行うように、第１ポンプ１ａの容量と第１及び第２電動モータ２ａ，２ｂの回転数を制御する。【選択図】図２
ELECTRIC CONSTRUCTION MACHINE
To provide an electric construction machine which improves pump efficiency of a hydraulic pump when an electric motor drives a hydraulic pump, and can achieve energy saving without impairing original performance of a construction machine.SOLUTION: A pressure sensor 10 detects a pressure of pressure oil of a pressure oil supply path 5 as a discharge pressure of a pump device 1 composed of first and second pumps 1a and 1b, a vehicle body controller 20 drives at least the first pump 1a between the first and second pumps 1a and 1b when the discharge pressure is lower than PL (first threshold), drives only the second pump 1b when the discharge pressure is equal to or more than the PL, and controls the capacity of the first pump 1a and engine speeds of first and second electric motors 2a and 2b so as to perform such output restriction control to continuously decrease a discharge flow rate of the pump device 1 composed of the first and second pumps 1a and 1b as the discharge pressure is raised and so as to restrict output of the pump device 1 to a maximum output M or less, when the discharge pressure is equal to or more than PL0 (second threshold).SELECTED DRAWING: Figure 2
【課題】電動モータが油圧ポンプを駆動するときの油圧ポンプのポンプ効率を改善し、建設機械の本来の性能を損なうことなく、省エネルギー化を実現することできる電動式建設機械を提供する。【解決手段】圧力センサ１０は圧油供給路５の圧油の圧力を第１及び第２ポンプ１ａ，１ｂからなるポンプ装置１の吐出圧として検出し、車体コントローラ２０は、その吐出圧がＰL（第１閾値）よりも低いときは、第１及び第２ポンプ１ａ，１ｂのうち少なくとも第１ポンプ１ａを駆動し、吐出圧がＰL以上にあるときは、第２ポンプ１ｂのみを駆動し、吐出圧がＰL0（第２閾値）以上にあるときは、吐出圧が上昇するにしたがって第１及び第２ポンプ１ａ，１ｂからなるポンプ装置１の吐出流量が連続的に減少し、当該ポンプ装置１の出力を最大出力Ｍ以下に制限する出力制限制御を行うように、第１ポンプ１ａの容量と第１及び第２電動モータ２ａ，２ｂの回転数を制御する。【選択図】図２
ELECTRIC CONSTRUCTION MACHINE
電動式建設機械
HO KA (author) / TSURIGA YASUTAKA (author) / HOSHINO MASATOSHI (author) / HIJIKATA SEIJI (author) / YAGISAWA RYO (author)
2022-10-13
Patent
Electronic Resource
Japanese
IPC:
E02F
Baggern
,
DREDGING