摘要:
In a power storage system including a secondary battery (1) and a capacitor (2), a bidirectional DC-DC converter is set into mode for charging the secondary battery (1) with electricity when a first state of charge (SOC) of the secondary battery (1) is larger than a minimum value of the first SOC, and a second SOC of the capacitor (2) is smaller than a maximum value of the second SOC, and the bidirectional DC-DC converter is set into mode for discharging electricity from the secondary battery (1) when the first SOC is smaller than a maximum value of the first SOC, and the second SOC is larger than a minimum value of the second SOC. On the basis of an internal resistance of the secondary battery (1), the second SOC, a voltage of a direct current link which are obtained when a load is not connected to the direct current link, and a bidirectional DC-DC converter error in a current on a direct current link side, a conduction ratio (D) of the bidirectional DC-DC converter is calculated to control the bidirectional DC-DC converter, so as to control a temperature by means of a change of the internal resistance.
摘要:
A hydraulic drive device (16) for cargo handling vehicle has: a tank (19); a pump (17) for drawing in a hydraulic oil from the tank and supplying the hydraulic oil to hydraulic cylinders; an electric motor (18) for driving the pump; a solenoid-controlled proportional valve (48) disposed between an inlet port of the pump and a bottom chamber of an up-and-down hydraulic cylinder (4) and configured to open with a valve travel depending upon a control input of a descent control of an up-and-down control member; a pressure compensation valve (50) disposed between a branch portion located between the pump and the solenoid-controlled proportional valve and the tank and configured to open with a valve travel depending upon a pressure difference between pressures upstream and downstream of the solenoid-controlled proportional valve; and a valve (53) disposed between the pressure compensation valve and the tank and configured to be switched between an open position and a close position.
摘要:
Provided is a working machine capable of decreasing a voltage of a DC busbar (DC bus) with a configuration suppressing a degradation in reliability. A hybrid type construction machine as a working machine includes: a DC bus which is connected to a rotation motor via an inverter circuit, a battery which is connected to the DC bus via a step-up/step-down converter and a switch, a controller which drives the inverter circuit and the step-up/step-down converter, a cooling liquid circulating system which includes a pump motor, and an inverter circuit which is connected to the DC bus and driving the pump motor. The controller includes a mode used for decreasing the voltage of the DC bus, and in that mode, the switch enters a disconnection state and the inverter circuit is operated to consume electricity in the pump motor.
摘要:
Disclosed is a hybrid construction machine that includes a control device 80 and an auxiliary control device 88. The control device 80 switches between a hydraulic/electric complex swing mode in which, when the swing control lever device 72 is manipulated, both the electric motor 25 and the hydraulic motor 27 are driven to drive the swing structure 20 by using the sum of the torque of the electric motor 25 and the torque of the hydraulic motor 27 and a hydraulic-only swing mode in which, when the swing control lever device 72 is manipulated, only the hydraulic motor 27 is driven to drive the swing structure 20 by using only the torque of the hydraulic motor 27. The auxiliary control device 88 includes a monitoring controller that is connected to the control device 80 and to the electric motor 25 to monitor the temperature or electrical leakage in the electric motor 25 as a substitute controller for the power control unit 55 or the electrical storage device 24 when the power control unit 55 or the electrical storage device 24 is removed due to its fault.
摘要:
A slewing-type working machine is capable of preventing a electric storage device from being overcharged while obtaining an appropriate slewing braking force by efficiently regenerating slewing energy during slewing braking. The slewing-type working machine includes: a electric storage device 16 capable of being charged with regenerative electric power for regenerating slewing energy of a upper slewing body while functioning as an electric power source for an electric slewing motor 18; a electric storage device 16 and electric storage device controller 22 detecting whether the electric storage device is under a normal condition with sufficient capacity to regenerate the slewing energy or under an abnormal condition without sufficient capacity; and control means 17 controlling a velocity of the electric slewing motor 18 based on a result of detection by the electric storage device 16 and electric storage device controller 22, wherein the control means 17 performs a velocity limiting control for limiting a maximum velocity of the electric slewing motor 18 when the electric storage device 16 is under the abnormal condition.
摘要:
When a hybrid-type construction machine including an electric power accumulator is started under a low-temperature environment, at first an ignition key of an engine is turned on to drive the engine. If the temperature of the electric power accumulator is lower than a predetermined temperature, the electric power accumulator is heated by driving the engine. Further, if the temperature of the electric power accumulator is lower than the predetermined temperature, the engine is driven to carry out a warm-up operation and a motor generator is driven to charging and discharge the electric power accumulator to thereby heat the electric power accumulator.